16 files changed, 4745 insertions, 0 deletions

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..46c7b6d
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,4 @@
+if which nix &>/dev/null; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/1.2.4/direnvrc" "sha256-mjD0RK61W+TEffhlEzjv2QB3l/d5FkXQVPd4S5DfCsA="
+  use flake
+fi
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..897f5e9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/target
+.direnv
+/result-*
+/result
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..7213b6b
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
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+}
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..207bf6f
--- /dev/null
+++ b/Cargo.lock
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+checksum = "c42e6fa53307c8a17e4ccd4dc81cf5ec38db9209f59b222210375b54ee40d1e2"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "tracing-core"
+version = "0.1.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f50de3927f93d202783f4513cda820ab47ef17f624b03c096e86ef00c67e6b5f"
+dependencies = [
+ "lazy_static",
+]
+
+[[package]]
+name = "tracing-futures"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97d095ae15e245a057c8e8451bab9b3ee1e1f68e9ba2b4fbc18d0ac5237835f2"
+dependencies = [
+ "pin-project",
+ "tracing",
+]
+
+[[package]]
+name = "typenum"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "879f6906492a7cd215bfa4cf595b600146ccfac0c79bcbd1f3000162af5e8b06"
+
+[[package]]
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+checksum = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
+dependencies = [
+ "version_check",
+]
+
+[[package]]
+name = "unicode-bidi"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eeb8be209bb1c96b7c177c7420d26e04eccacb0eeae6b980e35fcb74678107e0"
+dependencies = [
+ "matches",
+]
+
+[[package]]
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+version = "0.1.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07fbfce1c8a97d547e8b5334978438d9d6ec8c20e38f56d4a4374d181493eaef"
+dependencies = [
+ "tinyvec",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "universal-hash"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8326b2c654932e3e4f9196e69d08fdf7cfd718e1dc6f66b347e6024a0c961402"
+dependencies = [
+ "generic-array",
+ "subtle",
+]
+
+[[package]]
+name = "url"
+version = "2.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ccd964113622c8e9322cfac19eb1004a07e636c545f325da085d5cdde6f1f8b"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "matches",
+ "percent-encoding",
+ "serde",
+]
+
+[[package]]
+name = "utf-8"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+checksum = "6b676010e055c99033117c2343b33a40a30b91fecd6c49055ac9cd2d6c305ab1"
+dependencies = [
+ "ctor",
+ "sval",
+]
+
+[[package]]
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+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cbdbff6266a24120518560b5dc983096efb98462e51d0d68169895b237be3e5d"
+
+[[package]]
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+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d5b2c62b4012a3e1eca5a7e077d13b3bf498c4073e33ccd58626607748ceeca"
+
+[[package]]
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+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+
+[[package]]
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+version = "0.10.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
+
+[[package]]
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+version = "0.2.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83240549659d187488f91f33c0f8547cbfef0b2088bc470c116d1d260ef623d9"
+dependencies = [
+ "cfg-if 1.0.0",
+ "serde",
+ "serde_json",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae70622411ca953215ca6d06d3ebeb1e915f0f6613e3b495122878d7ebec7dae"
+dependencies = [
+ "bumpalo",
+ "lazy_static",
+ "log",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-futures"
+version = "0.4.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81b8b767af23de6ac18bf2168b690bed2902743ddf0fb39252e36f9e2bfc63ea"
+dependencies = [
+ "cfg-if 1.0.0",
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e734d91443f177bfdb41969de821e15c516931c3c3db3d318fa1b68975d0f6f"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d53739ff08c8a68b0fdbcd54c372b8ab800b1449ab3c9d706503bc7dd1621b2c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9a543ae66aa233d14bb765ed9af4a33e81b8b58d1584cf1b47ff8cd0b9e4489"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a905d57e488fec8861446d3393670fb50d27a262344013181c2cdf9fff5481be"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "wepoll-sys"
+version = "3.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fcb14dea929042224824779fbc82d9fab8d2e6d3cbc0ac404de8edf489e77ff"
+dependencies = [
+ "cc",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..66d3526
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,40 @@
+[package]
+name = "kittybox_micropub"
+version = "0.1.0"
+authors = ["Vika <vika@fireburn.ru>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dev-dependencies]
+tide-testing = "0.1.3"      # tide testing helper
+mockito = "0.30.0"          # HTTP mocking for Rust.
+serde_urlencoded = "0.7.0"
+
+[dependencies]
+# Redis driver for Rust.
+redis = { version = "0.20.0", features = ["aio", "async-std-comp", "r2d2"] }
+# A generic serialization/deserialization framework
+serde = { version = "1.0.125", features = ["derive"] }
+# Date and time library for Rust
+chrono = { version = "0.4.19", features = ["serde"] }
+# URL library for Rust, based on the WHATWG URL Standard
+url = { version = "2.2.1", features = ["serde"] }
+# Async version of the Rust standard library
+async-std = { version = "1.9.0", features = ["attributes"] }
+lazy_static = "1.4.0"       # A macro for declaring lazily evaluated statics in Rust.
+async-trait = "0.1.50"      # Type erasure for async trait methods
+env_logger = "0.8.3"        # A logging implementation for `log` which is configured via an environment variable.
+futures = "0.3.14"          # An implementation of futures and streams
+futures-util = "0.3.14"     # Common utilities and extension traits for the futures-rs library.
+http-types = "2.11.0"       # Common types for HTTP operations.
+log = "0.4.14"              # A lightweight logging facade for Rust
+serde_json = "1.0.64"       # A JSON serialization file format
+surf = "2.2.0"              # Surf the web - HTTP client framework
+tide = "0.16.0"             # A minimal and pragmatic Rust web application framework built for rapid development
+newbase60 = "0.1.3"         # A library that implements Tantek Çelik's New Base 60
+markdown = "0.3.0"          # Native Rust library for parsing Markdown and (outputting HTML)
+easy-scraper = "0.2.0"      # HTML scraping library focused on ease of use
+serde_urlencoded = "0.7.0"  # `x-www-form-urlencoded` meets Serde
+mobc-redis = "0.7.0"        # Redis support for the mobc connection pool
+mobc = "0.7.2"              # A generic connection pool with async/await support
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..7b1a509
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,66 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1619345332,
+        "narHash": "sha256-qHnQkEp1uklKTpx3MvKtY6xzgcqXDsz5nLilbbuL+3A=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "2ebf2558e5bf978c7fb8ea927dfaed8fefab2e28",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1618743970,
+        "narHash": "sha256-94fPo1o1kVcJTb5adsUzX22vdroZ94KklLSPZHlPUlk=",
+        "owner": "kisik21",
+        "repo": "nixpkgs",
+        "rev": "cafee031efa7d30f16accdb6c5f8443ae29ceedb",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust": "rust"
+      }
+    },
+    "rust": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1619727528,
+        "narHash": "sha256-9Rjw750fdHX2HGa23pIE1DjwyPD4wc2zUuCVdw8IUbY=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "0e0dc6d953ec3cbcad39ef05b07bbaca8037c192",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "ref": "master",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..9eb296e
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,66 @@
+{
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    rust = {
+      type = "github";
+      owner = "oxalica";
+      repo = "rust-overlay";
+      ref = "master";
+      inputs.flake-utils.follows = "flake-utils";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+  outputs = { self, nixpkgs, rust, flake-utils }: let
+    supportedSystems = ["aarch64-linux" "x86_64-linux"];
+    forAllSystems = f: flake-utils.lib.eachSystem supportedSystems f;
+  in forAllSystems (system: let
+    pkgs = import nixpkgs {
+      localSystem.system = system;
+      overlays = [ rust.overlay ];
+    };
+    rust-bin = pkgs.rust-bin.stable.latest;
+    packages = {
+      kittybox-micropub = { stdenv, lib, openssl, pkg-config, redis, rustPlatform }:
+      rustPlatform.buildRustPackage {
+        name = "kittybox-micropub";
+        version = "0.1.0";
+
+        src = ./.;
+
+        #cargoSha256 = nixpkgs.lib.fakeSha256;
+        cargoHash = "sha256-DnPwAuzXWLJdyDf0dvfXUic0oQPVCpsnCyFdLSlsSs0=";
+
+        buildInputs = [ openssl ];
+        nativeBuildInputs = [ pkg-config ];
+        checkInputs = [ redis ];
+        doCheck = stdenv.hostPlatform == stdenv.targetPlatform;
+
+        meta = with lib.meta; {
+          maintainers = with maintainers; [ vika_nezrimaya ];
+          platforms = supportedSystems;
+          mainProgram = "kittybox_micropub";
+        };
+      };
+    };
+  in {
+    packages = let
+      rustPlatform = pkgs.makeRustPlatform {
+        rustc = rust-bin.minimal;
+        cargo = rust-bin.minimal;
+      };
+    in {
+      kittybox-micropub = pkgs.callPackage packages.kittybox-micropub { inherit rustPlatform; };
+    };
+    defaultPackage = self.packages.${system}.kittybox-micropub;
+
+    devShell = pkgs.mkShell {
+      name = "rust-dev-shell";
+      buildInputs = with pkgs; [ openssl ];
+      nativeBuildInputs = with pkgs; [
+        pkg-config lld
+        rust-bin.default
+        rust-bin.rls
+      ];
+    };
+  });
+}
diff --git a/src/database.rs b/src/database.rs
new file mode 100644
index 0000000..3a9ac04
--- /dev/null
+++ b/src/database.rs
@@ -0,0 +1,625 @@
+#![allow(unused_variables)]
+use async_trait::async_trait;
+use lazy_static::lazy_static;
+#[cfg(test)]
+use std::collections::HashMap;
+#[cfg(test)]
+use std::sync::Arc;
+#[cfg(test)]
+use async_std::sync::RwLock;
+use log::error;
+use futures::stream;
+use futures_util::FutureExt;
+use futures_util::StreamExt;
+use serde::{Serialize,Deserialize};
+use serde_json::json;
+use redis;
+use redis::AsyncCommands;
+
+use crate::indieauth::User;
+
+#[derive(Serialize, Deserialize, PartialEq, Debug)]
+pub struct MicropubChannel {
+    pub uid: String,
+    pub name: String
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum ErrorKind {
+    Backend,
+    PermissionDenied,
+    JSONParsing,
+    NotFound,
+    Other
+}
+
+// TODO get rid of your own errors and use a crate?
+#[derive(Debug)]
+pub struct StorageError {
+    msg: String,
+    source: Option<Box<dyn std::error::Error>>,
+    kind: ErrorKind
+}
+unsafe impl Send for StorageError {}
+unsafe impl Sync for StorageError {}
+impl std::error::Error for StorageError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        self.source.as_ref().map(|e| e.as_ref())
+    }
+}
+impl From<redis::RedisError> for StorageError {
+    fn from(err: redis::RedisError) -> Self {
+        Self {
+            msg: format!("{}", err),
+            source: Some(Box::new(err)),
+            kind: ErrorKind::Backend
+        }
+    }
+}
+impl From<serde_json::Error> for StorageError {
+    fn from(err: serde_json::Error) -> Self {
+        Self {
+            msg: format!("{}", err),
+            source: Some(Box::new(err)),
+            kind: ErrorKind::JSONParsing
+        }
+    }
+}
+impl std::fmt::Display for StorageError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match match self.kind {
+            ErrorKind::Backend => write!(f, "backend error: "),
+            ErrorKind::JSONParsing => write!(f, "error while parsing JSON: "),
+            ErrorKind::PermissionDenied => write!(f, "permission denied: "),
+            ErrorKind::NotFound => write!(f, "not found: "),
+            ErrorKind::Other => write!(f, "generic storage layer error: ")
+        } {
+            Ok(_) => write!(f, "{}", self.msg),
+            Err(err) => Err(err)
+        }
+    }
+}
+impl serde::Serialize for StorageError {
+    fn serialize<S: serde::Serializer>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error> {
+        serializer.serialize_str(&self.to_string())
+    }
+}
+impl StorageError {
+    fn new(kind: ErrorKind, msg: &str) -> Self {
+        return StorageError {
+            msg: msg.to_string(),
+            source: None,
+            kind
+        }
+    }
+    pub fn kind(&self) -> ErrorKind {
+        self.kind
+    }
+}
+
+pub type Result<T> = std::result::Result<T, StorageError>;
+
+/// A storage backend for the Micropub server.
+/// 
+/// Implementations should note that all methods listed on this trait MUST be fully atomic
+/// or lock the database so that write conflicts or reading half-written data should not occur.
+#[async_trait]
+pub trait Storage: Clone + Send + Sync {
+    /// Check if a post exists in the database.
+    async fn post_exists(&self, url: &str) -> Result<bool>;
+
+    /// Load a post from the database in MF2-JSON format, deserialized from JSON.
+    async fn get_post(&self, url: &str) -> Result<Option<serde_json::Value>>;
+
+    /// Save a post to the database as an MF2-JSON structure.
+    /// 
+    /// Note that the `post` object MUST have `post["properties"]["uid"][0]` defined.
+    async fn put_post<'a>(&self, post: &'a serde_json::Value) -> Result<()>;
+
+    /*/// Save a post and add it to the relevant feeds listed in `post["properties"]["channel"]`.
+    /// 
+    /// Note that the `post` object MUST have `post["properties"]["uid"][0]` defined 
+    /// and `post["properties"]["channel"]` defined, even if it's empty.
+    async fn put_and_index_post<'a>(&mut self, post: &'a serde_json::Value) -> Result<()>;*/
+    
+    /// Modify a post using an update object as defined in the Micropub spec.
+    /// 
+    /// Note to implementors: the update operation MUST be atomic OR MUST lock the database
+    /// to prevent two clients overwriting each other's changes.
+    /// 
+    /// You can assume concurrent updates will never contradict each other, since that will be dumb.
+    /// The last update always wins.
+    async fn update_post<'a>(&self, url: &'a str, update: serde_json::Value) -> Result<()>;
+
+    /// Get a list of channels available for the user represented by the `user` object to write.
+    async fn get_channels(&self, user: &User) -> Result<Vec<MicropubChannel>>;
+
+    /// Fetch a feed at `url` and return a an h-feed object containing
+    /// `limit` posts after a post by url `after`, filtering the content
+    /// in context of a user specified by `user` (or an anonymous user).
+    /// 
+    /// Specifically, private posts that don't include the user in the audience
+    /// will be elided from the feed, and the posts containing location and not
+    /// specifying post["properties"]["location-visibility"][0] == "public"
+    /// will have their location data (but not check-in data) stripped.
+    /// 
+    /// This function is used as an optimization so the client, whatever it is,
+    /// doesn't have to fetch posts, then realize some of them are private, and
+    /// fetch more posts.
+    /// 
+    /// Note for implementors: if you use streams to fetch posts in parallel
+    /// from the database, preferably make this method use a connection pool
+    /// to reduce overhead of creating a database connection per post for
+    /// parallel fetching.
+    async fn read_feed_with_limit<'a>(&self, url: &'a str, after: &'a Option<String>, limit: usize, user: &'a Option<String>) -> Result<Option<serde_json::Value>>;
+
+    /// Deletes a post from the database irreversibly. 'nuff said. Must be idempotent.
+    async fn delete_post<'a>(&self, url: &'a str) -> Result<()>;
+}
+
+#[cfg(test)]
+#[derive(Clone)]
+pub struct MemoryStorage {
+    pub mapping: Arc<RwLock<HashMap<String, serde_json::Value>>>,
+    pub channels: Arc<RwLock<HashMap<String, Vec<String>>>>
+}
+
+#[cfg(test)]
+#[async_trait]
+impl Storage for MemoryStorage {
+    async fn read_feed_with_limit<'a>(&self, url: &'a str, after: &'a Option<String>, limit: usize, user: &'a Option<String>) -> Result<Option<serde_json::Value>> {
+        todo!()
+    }
+
+    async fn update_post<'a>(&self, url: &'a str, update: serde_json::Value) -> Result<()> {
+        todo!()
+    }
+
+    async fn delete_post<'a>(&self, url: &'a str) -> Result<()> {
+        self.mapping.write().await.remove(url);
+        Ok(())
+    }
+
+    async fn post_exists(&self, url: &str) -> Result<bool> {
+        return Ok(self.mapping.read().await.contains_key(url))
+    }
+
+    async fn get_post(&self, url: &str) ->Result<Option<serde_json::Value>> {
+        let mapping = self.mapping.read().await;
+        match mapping.get(url) {
+            Some(val) => {
+                if let Some(new_url) = val["see_other"].as_str() {
+                    match mapping.get(new_url) {
+                        Some(val) => Ok(Some(val.clone())),
+                        None => {
+                            drop(mapping);
+                            self.mapping.write().await.remove(url);
+                            Ok(None)
+                        }
+                    }
+                } else {
+                    Ok(Some(val.clone()))
+                }
+            },
+            _ => Ok(None)
+        }
+    }
+
+    async fn get_channels(&self, user: &User) -> Result<Vec<MicropubChannel>> {
+        match self.channels.read().await.get(&user.me.to_string()) {
+            Some(channels) => Ok(futures_util::future::join_all(channels.iter()
+                .map(|channel| self.get_post(channel)
+                    .map(|result| result.unwrap())
+                    .map(|post: Option<serde_json::Value>| {
+                        if let Some(post) = post {
+                            Some(MicropubChannel {
+                                uid: post["properties"]["uid"][0].as_str().unwrap().to_string(),
+                                name: post["properties"]["name"][0].as_str().unwrap().to_string()
+                            })
+                        } else { None }
+                    })
+                ).collect::<Vec<_>>()).await.into_iter().filter_map(|chan| chan).collect::<Vec<_>>()),
+            None => Ok(vec![])
+        }
+        
+    }
+
+    async fn put_post<'a>(&self, post: &'a serde_json::Value) -> Result<()> {
+        let mapping = &mut self.mapping.write().await;
+        let key: &str;
+        match post["properties"]["uid"][0].as_str() {
+            Some(uid) => key = uid,
+            None => return Err(StorageError::new(ErrorKind::Other, "post doesn't have a UID"))
+        }
+        mapping.insert(key.to_string(), post.clone());
+        if post["properties"]["url"].is_array() {
+            for url in post["properties"]["url"].as_array().unwrap().iter().map(|i| i.as_str().unwrap().to_string()) {
+                if &url != key {
+                    mapping.insert(url, json!({"see_other": key}));
+                }
+            }
+        }
+        if post["type"].as_array().unwrap().iter().any(|i| i == "h-feed") {
+            // This is a feed. Add it to the channels array if it's not already there.
+            println!("{:#}", post);
+            self.channels.write().await.entry(post["properties"]["author"][0].as_str().unwrap().to_string()).or_insert(vec![]).push(key.to_string())
+        }
+        Ok(())
+    }
+}
+#[cfg(test)]
+impl MemoryStorage {
+    pub fn new() -> Self {
+        Self {
+            mapping: Arc::new(RwLock::new(HashMap::new())),
+            channels: Arc::new(RwLock::new(HashMap::new()))
+        }
+    }
+}
+
+struct RedisScripts {
+    edit_post: redis::Script
+}
+
+lazy_static! {
+    static ref SCRIPTS: RedisScripts = RedisScripts {
+        edit_post: redis::Script::new(include_str!("./edit_post.lua"))
+    };
+}
+
+#[derive(Clone)]
+pub struct RedisStorage {
+    // TODO: use mobc crate to create a connection pool and reuse connections for efficiency
+    redis: redis::Client,
+}
+
+fn filter_post<'a>(mut post: serde_json::Value, user: &'a Option<String>) -> Option<serde_json::Value> {
+    if post["properties"]["deleted"][0].is_string() {
+        return Some(json!({
+            "type": post["type"],
+            "properties": {
+                "deleted": post["properties"]["deleted"]
+            }
+        }));
+    }
+    let empty_vec: Vec<serde_json::Value> = vec![];
+    let author = post["properties"]["author"].as_array().unwrap_or(&empty_vec).iter().map(|i| i.as_str().unwrap().to_string());
+    let visibility = post["properties"]["visibility"][0].as_str().unwrap_or("public");
+    let mut audience = author.chain(post["properties"]["audience"].as_array().unwrap_or(&empty_vec).iter().map(|i| i.as_str().unwrap().to_string()));
+    if visibility == "private" {
+        if !audience.any(|i| Some(i) == *user) {
+            return None
+        }
+    }
+    if post["properties"]["location"].is_array() {
+        let location_visibility = post["properties"]["location-visibility"][0].as_str().unwrap_or("private");
+        let mut author = post["properties"]["author"].as_array().unwrap_or(&empty_vec).iter().map(|i| i.as_str().unwrap().to_string());
+        if location_visibility == "private" && !author.any(|i| Some(i) == *user) {
+            post["properties"].as_object_mut().unwrap().remove("location");
+        }
+    }
+    Some(post)
+}
+
+#[async_trait]
+impl Storage for RedisStorage {
+    async fn delete_post<'a>(&self, url: &'a str) -> Result<()> {
+        match self.redis.get_async_std_connection().await {
+            Ok(mut conn) => if let Err(err) = conn.hdel::<&str, &str, bool>("posts", url).await {
+                return Err(err.into());
+            },
+            Err(err) => return Err(err.into())
+        }
+        Ok(())
+    }
+
+    async fn post_exists(&self, url: &str) -> Result<bool> {
+        match self.redis.get_async_std_connection().await {
+            Ok(mut conn) => match conn.hexists::<&str, &str, bool>(&"posts", url).await {
+                Ok(val) => Ok(val),
+                Err(err) => Err(err.into())
+            },
+            Err(err) => Err(err.into())
+        }
+    }
+    
+    async fn get_post(&self, url: &str) -> Result<Option<serde_json::Value>> {
+        match self.redis.get_async_std_connection().await {
+            Ok(mut conn) => match conn.hget::<&str, &str, Option<String>>(&"posts", url).await {
+                Ok(val) => match val {
+                    Some(val) => match serde_json::from_str::<serde_json::Value>(&val) {
+                        Ok(parsed) => if let Some(new_url) = parsed["see_other"].as_str() {
+                            match conn.hget::<&str, &str, Option<String>>(&"posts", new_url).await {
+                                Ok(val) => match val {
+                                    Some(val) => match serde_json::from_str::<serde_json::Value>(&val) {
+                                        Ok(parsed) => Ok(Some(parsed)),
+                                        Err(err) => Err(err.into())
+                                    },
+                                    None => Ok(None)
+                                }
+                                Err(err) => {
+                                    Ok(None)
+                                }
+                            }
+                        } else {
+                            Ok(Some(parsed))
+                        },
+                        Err(err) => Err(err.into())
+                    },
+                    None => Ok(None)
+                },
+                Err(err) => Err(err.into())
+            },
+            Err(err) => Err(err.into())
+        }
+    }
+
+    async fn get_channels(&self, user: &User) -> Result<Vec<MicropubChannel>> {
+        match self.redis.get_async_std_connection().await {
+            Ok(mut conn) => match conn.smembers::<String, Vec<String>>("channels_".to_string() + user.me.as_str()).await {
+                Ok(channels) => {
+                    Ok(futures_util::future::join_all(channels.iter()
+                        .map(|channel| self.get_post(channel)
+                            .map(|result| result.unwrap())
+                            .map(|post: Option<serde_json::Value>| {
+                                if let Some(post) = post {
+                                    Some(MicropubChannel {
+                                        uid: post["properties"]["uid"][0].as_str().unwrap().to_string(),
+                                        name: post["properties"]["name"][0].as_str().unwrap().to_string()
+                                    })
+                                } else { None }
+                            })
+                        ).collect::<Vec<_>>()).await.into_iter().filter_map(|chan| chan).collect::<Vec<_>>())
+                },
+                Err(err) => Err(err.into())
+            },
+            Err(err) => Err(err.into())
+        }
+    }
+
+    async fn put_post<'a>(&self, post: &'a serde_json::Value) -> Result<()> {
+        match self.redis.get_async_std_connection().await {
+            Ok(mut conn) => {
+                let key: &str;
+                match post["properties"]["uid"][0].as_str() {
+                    Some(uid) => key = uid,
+                    None => return Err(StorageError::new(ErrorKind::Other, "post doesn't have a UID"))
+                }        
+                match conn.hset::<&str, &str, String, ()>(&"posts", key, post.to_string()).await {
+                    Err(err) => return Err(err.into()),
+                    _ => {}
+                }
+                if post["properties"]["url"].is_array() {
+                    for url in post["properties"]["url"].as_array().unwrap().iter().map(|i| i.as_str().unwrap().to_string()) {
+                        if &url != key {
+                            match conn.hset::<&str, &str, String, ()>(&"posts", &url, json!({"see_other": key}).to_string()).await {
+                                Err(err) => return Err(err.into()),
+                                _ => {}
+                            }
+                        }
+                    }
+                }
+                if post["type"].as_array().unwrap().iter().any(|i| i == "h-feed") {
+                    // This is a feed. Add it to the channels array if it's not already there.
+                    match conn.sadd::<String, &str, ()>("channels_".to_string() + post["properties"]["author"][0].as_str().unwrap(), key).await {
+                        Err(err) => return Err(err.into()),
+                        _ => {},
+                    }
+                }
+                Ok(())
+            },
+            Err(err) => Err(err.into())
+        }
+    }
+
+    async fn read_feed_with_limit<'a>(&self, url: &'a str, after: &'a Option<String>, limit: usize, user: &'a Option<String>) -> Result<Option<serde_json::Value>> {
+        match self.redis.get_async_std_connection().await {
+            Ok(mut conn) => {
+                let mut feed;
+                match conn.hget::<&str, &str, Option<String>>(&"posts", url).await {
+                    Ok(post) => {
+                        match post {
+                            Some(post) => match serde_json::from_str::<serde_json::Value>(&post) {
+                                Ok(post) => feed = post,
+                                Err(err) => return Err(err.into())
+                            },
+                            None => return Ok(None)
+                        }
+                    },
+                    Err(err) => return Err(err.into())
+                }
+                if feed["see_other"].is_string() {
+                    match conn.hget::<&str, &str, Option<String>>(&"posts", feed["see_other"].as_str().unwrap()).await {
+                        Ok(post) => {
+                            match post {
+                                Some(post) => match serde_json::from_str::<serde_json::Value>(&post) {
+                                    Ok(post) => feed = post,
+                                    Err(err) => return Err(err.into())
+                                },
+                                None => return Ok(None)
+                            }
+                        },
+                        Err(err) => return Err(err.into())
+                    }
+                }
+                if let Some(post) = filter_post(feed, user) {
+                    feed = post
+                } else {
+                    return Err(StorageError::new(ErrorKind::PermissionDenied, "specified user cannot access this post"))
+                }
+                if feed["children"].is_array() {
+                    let children = feed["children"].as_array().unwrap();
+                    let posts_iter: Box<dyn std::iter::Iterator<Item = String> + Send>;
+                    if let Some(after) = after {
+                        posts_iter = Box::new(children.iter().map(|i| i.as_str().unwrap().to_string()).skip_while(move |i| i != after).skip(1));
+                    } else {
+                        posts_iter = Box::new(children.iter().map(|i| i.as_str().unwrap().to_string()));
+                    }
+                    let posts = stream::iter(posts_iter)
+                        .map(|url| async move {
+                            // Is it rational to use a new connection for every post fetched?
+                            match self.redis.get_async_std_connection().await {
+                                Ok(mut conn) => match conn.hget::<&str, &str, Option<String>>("posts", &url).await {
+                                    Ok(post) => match post {
+                                        Some(post) => match serde_json::from_str::<serde_json::Value>(&post) {
+                                            Ok(post) => Some(post),
+                                            Err(err) => {
+                                                let err = StorageError::from(err);
+                                                error!("{}", err);
+                                                panic!("{}", err)
+                                            }
+                                        },
+                                        // Happens because of a broken link (result of an improper deletion?)
+                                        None => None,
+                                    },
+                                    Err(err) => {
+                                        let err = StorageError::from(err);
+                                        error!("{}", err);
+                                        panic!("{}", err)
+                                    }
+                                },
+                                Err(err) => {
+                                    let err = StorageError::from(err);
+                                    error!("{}", err);
+                                    panic!("{}", err)
+                                }
+                            }
+                        })
+                        // TODO: determine the optimal value for this buffer
+                        // It will probably depend on how often can you encounter a private post on the page
+                        // It shouldn't be too large, or we'll start fetching too many posts from the database
+                        // It MUST NOT be larger than the typical page size
+                        .buffered(std::cmp::min(3, limit))
+                        // Hack to unwrap the Option and sieve out broken links
+                        // Broken links return None, and Stream::filter_map skips all Nones.
+                        .filter_map(|post: Option<serde_json::Value>| async move { post })
+                        .filter_map(|post| async move {
+                            return filter_post(post, user)
+                        })
+                        .take(limit);
+                    match std::panic::AssertUnwindSafe(posts.collect::<Vec<serde_json::Value>>()).catch_unwind().await {
+                        Ok(posts) => feed["children"] = json!(posts),
+                        Err(err) => return Err(StorageError::new(ErrorKind::Other, "Unknown error encountered while assembling feed, see logs for more info"))
+                    }
+                }
+                return Ok(Some(feed));
+            }
+            Err(err) => Err(err.into())
+        }
+    }
+
+    async fn update_post<'a>(&self, mut url: &'a str, update: serde_json::Value) -> Result<()> {
+        match self.redis.get_async_std_connection().await {
+            Ok(mut conn) => {
+                if !conn.hexists::<&str, &str, bool>("posts", url).await.unwrap() {
+                    return Err(StorageError::new(ErrorKind::NotFound, "can't edit a non-existent post"))
+                }
+                let post: serde_json::Value = serde_json::from_str(&conn.hget::<&str, &str, String>("posts", url).await.unwrap()).unwrap();
+                if let Some(new_url) = post["see_other"].as_str() {
+                    url = new_url
+                }
+                if let Err(err) = SCRIPTS.edit_post.key("posts").arg(url).arg(update.to_string()).invoke_async::<_, ()>(&mut conn).await {
+                    return Err(err.into())
+                }
+            },
+            Err(err) => return Err(err.into())
+        }
+        Ok(())
+    }
+}
+
+
+impl RedisStorage {
+    /// Create a new RedisDatabase that will connect to Redis at `redis_uri` to store data.
+    pub async fn new(redis_uri: String) -> Result<Self> {
+        match redis::Client::open(redis_uri) {
+            Ok(client) => Ok(Self { redis: client }),
+            Err(e) => Err(e.into())
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{Storage, MicropubChannel};
+    use serde_json::json;
+
+    async fn test_backend_basic_operations<Backend: Storage>(backend: Backend) {
+        let post: serde_json::Value = json!({
+            "type": ["h-entry"],
+            "properties": {
+                "content": ["Test content"],
+                "author": ["https://fireburn.ru/"],
+                "uid": ["https://fireburn.ru/posts/hello"],
+                "url": ["https://fireburn.ru/posts/hello", "https://fireburn.ru/posts/test"]
+            }
+        });
+        let key = post["properties"]["uid"][0].as_str().unwrap().to_string();
+        let alt_url = post["properties"]["url"][1].as_str().unwrap().to_string();
+
+        // Reading and writing
+        backend.put_post(&post).await.unwrap();
+        if let Ok(Some(returned_post)) = backend.get_post(&key).await {
+            assert!(returned_post.is_object());
+            assert_eq!(returned_post["type"].as_array().unwrap().len(), post["type"].as_array().unwrap().len());
+            assert_eq!(returned_post["type"].as_array().unwrap(), post["type"].as_array().unwrap());
+            let props: &serde_json::Map<String, serde_json::Value> = post["properties"].as_object().unwrap();
+            for key in props.keys() {
+                assert_eq!(returned_post["properties"][key].as_array().unwrap(), post["properties"][key].as_array().unwrap())
+            }
+        } else { panic!("For some reason the backend did not return the post.") }
+        // Check the alternative URL - it should return the same post
+        if let Ok(Some(returned_post)) = backend.get_post(&alt_url).await {
+            assert!(returned_post.is_object());
+            assert_eq!(returned_post["type"].as_array().unwrap().len(), post["type"].as_array().unwrap().len());
+            assert_eq!(returned_post["type"].as_array().unwrap(), post["type"].as_array().unwrap());
+            let props: &serde_json::Map<String, serde_json::Value> = post["properties"].as_object().unwrap();
+            for key in props.keys() {
+                assert_eq!(returned_post["properties"][key].as_array().unwrap(), post["properties"][key].as_array().unwrap())
+            }
+        } else { panic!("For some reason the backend did not return the post.") }
+    }
+
+    async fn test_backend_channel_support<Backend: Storage>(backend: Backend) {
+        let feed = json!({
+            "type": ["h-feed"],
+            "properties": {
+                "name": ["Main Page"],
+                "author": ["https://fireburn.ru/"],
+                "uid": ["https://fireburn.ru/feeds/main"]
+            },
+            "children": []
+        });
+        let key = feed["properties"]["uid"][0].as_str().unwrap().to_string();
+        backend.put_post(&feed).await.unwrap();
+        let chans = backend.get_channels(&crate::indieauth::User::new("https://fireburn.ru/", "https://quill.p3k.io/", "create update media")).await.unwrap();
+        assert_eq!(chans.len(), 1);
+        assert_eq!(chans[0], MicropubChannel { uid: "https://fireburn.ru/feeds/main".to_string(), name: "Main Page".to_string() });
+    }
+
+    #[async_std::test]
+    async fn test_memory_storage_basic_operations() {
+        let backend = super::MemoryStorage::new();
+        test_backend_basic_operations(backend).await
+    }
+    #[async_std::test]
+    async fn test_memory_storage_channel_support() {
+        let backend = super::MemoryStorage::new();
+        test_backend_channel_support(backend).await
+    }
+
+    #[async_std::test]
+    #[ignore]
+    async fn test_redis_storage_basic_operations() {
+        let backend = super::RedisStorage::new(std::env::var("REDIS_URI").unwrap_or("redis://127.0.0.1:6379/0".to_string())).await.unwrap();
+        redis::cmd("FLUSHDB").query_async::<_, ()>(&mut backend.redis.get_async_std_connection().await.unwrap()).await.unwrap();
+        test_backend_basic_operations(backend).await
+    }
+    #[async_std::test]
+    #[ignore]
+    async fn test_redis_storage_channel_support() {
+        let backend = super::RedisStorage::new(std::env::var("REDIS_URI").unwrap_or("redis://127.0.0.1:6379/1".to_string())).await.unwrap();
+        redis::cmd("FLUSHDB").query_async::<_, ()>(&mut backend.redis.get_async_std_connection().await.unwrap()).await.unwrap();
+        test_backend_channel_support(backend).await
+    }
+}
diff --git a/src/edit_post.lua b/src/edit_post.lua
new file mode 100644
index 0000000..a398f8d
--- /dev/null
+++ b/src/edit_post.lua
@@ -0,0 +1,93 @@
+local posts = KEYS[1]
+local update_desc = cjson.decode(ARGV[2])
+local post = cjson.decode(redis.call("HGET", posts, ARGV[1]))
+
+local delete_keys = {}
+local delete_kvs = {}
+local add_keys = {}
+
+if update_desc.replace ~= nil then
+    for k, v in pairs(update_desc.replace) do
+        table.insert(delete_keys, k)
+        add_keys[k] = v
+    end
+end
+if update_desc.delete ~= nil then
+    if update_desc.delete[0] == nil then
+        -- Table has string keys. Probably!
+        for k, v in pairs(update_desc.delete) do
+            delete_kvs[k] = v
+        end
+    else
+        -- Table has numeric keys. Probably!
+        for i, v in ipairs(update_desc.delete) do
+            table.insert(delete_keys, v)
+        end
+    end
+end
+if update_desc.add ~= nil then
+    for k, v in pairs(update_desc.add) do
+        add_keys[k] = v
+    end
+end
+
+for i, v in ipairs(delete_keys) do
+    post["properties"][v] = nil
+    -- TODO delete URL links
+end
+
+for k, v in pairs(delete_kvs) do
+    local index = -1
+    if k == "children" then
+        for j, w in ipairs(post[k]) do
+            if w == v then
+                index = j
+                break
+            end
+        end
+        if index > -1 then
+            table.remove(post[k], index)
+        end
+    else
+        for j, w in ipairs(post["properties"][k]) do
+            if w == v then
+                index = j
+                break
+            end
+        end
+        if index > -1 then
+            table.remove(post["properties"][k], index)
+            -- TODO delete URL links
+        end
+    end
+end
+
+for k, v in pairs(add_keys) do
+    if k == "children" then
+        if post["children"] == nil then
+            post["children"] = {}
+        end
+        for i, w in ipairs(v) do
+            table.insert(post["children"], 1, w)
+        end
+    else
+        if post["properties"][k] == nil then
+            post["properties"][k] = {}
+        end
+        for i, w in ipairs(v) do
+            table.insert(post["properties"][k], w)
+        end
+        if k == "url" then
+            redis.call("HSET", posts, v, cjson.encode({ see_other = post["properties"]["uid"][1] }))
+        elseif k == "channel" then
+            local feed = cjson.decode(redis.call("HGET", posts, v))
+            table.insert(feed["children"], 1, post["properties"]["uid"][1])
+            redis.call("HSET", posts, v, cjson.encode(feed))
+        end
+    end
+end
+
+local encoded = cjson.encode(post)
+redis.call("SET", "debug", encoded)
+redis.call("HSET", posts, post["properties"]["uid"][1], encoded)
+return
\ No newline at end of file
diff --git a/src/index.html b/src/index.html
new file mode 100644
index 0000000..15ccfc0
--- /dev/null
+++ b/src/index.html
@@ -0,0 +1,172 @@
+<html>
+    <head>
+        <meta charset="utf-8">
+        <title>Kittybox-Micropub debug client</title>
+        <style type="text/css">
+        * {
+            box-sizing: border-box;
+        }
+        :root {
+            font-family: sans-serif;
+        }
+        body {
+            margin: 0;
+        }
+        body > main {
+            margin: auto;
+            max-width: 1024px;
+        }
+        h1.header {
+            margin-top: 0.75em;
+            text-align: center;
+        }
+        fieldset + fieldset, fieldset + input, section + section, section + fieldset {
+            margin-top: 0.75em;
+        }
+        input[type="submit"] {
+            margin-left: auto;
+            display: block;
+        }
+        form > fieldset > section > label {
+            width: 100%;
+            display: block;
+        }
+        form > fieldset > section > input, form > fieldset > section > textarea {
+            width: 100%;
+        }
+        textarea {
+            min-height: 10em;
+        }
+        </style>
+        <script type="module">
+            const form = document.getElementById("micropub");
+            const channel_select_radio = document.getElementById("select_channels");
+            channel_select_radio.onclick = async () => {
+                const channels = await query_channels()
+                if (channels !== undefined) {
+                    populate_channel_list(channels)
+                }
+            }
+            const no_channel_radio = document.getElementById("no_channel");
+            no_channel_radio.onclick = () => {
+                document.getElementById("channels").style.display = "none";
+                const channel_list = document.getElementById("channels_target")
+                channel_list.innerHTML = "";
+            }
+            function construct_body(form) {
+                return {
+                    type: ["h-entry"],
+                    properties: {
+                        content: [form.elements.content.value],
+                        name: form.elements.name.value ? [form.elements.name.value] : undefined,
+                        category: form.elements.category.value ? form.elements.category.value.split(",").map(val => val.trim()) : undefined,
+                        channel: form.elements.channel_select.value ?  Array.from(form.elements.channel).map(i => i.checked ? i.value : false).filter(i => i) : undefined
+                    }
+                }
+            }
+
+            async function query_channels() {
+                return ["main", "likes", "bookmarks"]
+                const response = await fetch(form.action + "?q=config", {
+                    headers: {
+                        "Authorization": `Bearer ${form.elements.access_token.value}`
+                    }
+                })
+
+                const config = await response.json();
+
+                return config["channels"]
+            }
+
+            function populate_channel_list(channels) {
+                document.getElementById("channels").style.display = "block";
+                const channel_list = document.getElementById("channels_target")
+                channel_list.innerHTML = "";
+                channels.forEach((channel) => {
+                    const template = document.getElementById("channel_selector").content.cloneNode(true)
+                    const input = template.querySelector("input")
+                    const label = template.querySelector("label")
+                    input.id = `channel_selector_option_${channel}`
+                    input.value = channel
+                    label.for = input.id
+                    label.innerHTML = `<code>${channel}</code>`
+
+                    channel_list.appendChild(template)
+                })
+            }
+
+            form.onsubmit = async (event) => {
+                event.preventDefault()
+                console.log(JSON.stringify(construct_body(form)))
+                return
+                const response = await fetch(form.action, {
+                    headers: {
+                        "Authorization": `Bearer ${form.elements.access_token.value}`
+                    },
+                    body: construct_body(form)
+                })
+            }
+        </script>
+    </head>
+    <body>
+        <h1 class="header">Kittybox-Micropub debug client</h1>
+
+        <main>
+            <p>
+                In a pinch? Lost your Micropub client, but need to make a quick announcement?
+                Worry not, the debug client has your back. <i>I just hope you have a spare Micropub token stored somewhere like I do...</i>
+            </p>
+
+            <form action="/micropub" method="POST" id="micropub">
+                <fieldset>
+                    <legend>Authorization details</legend>
+                    <section>
+                        <label for="access_token">Access token:</label>
+                        <input id="access_token" name="access_token" type="password">
+
+                        <p><a href="https://gimme-a-token.5eb.nl/" target="_blank">Get an access token (will open in a new tab)</a></p>
+                    </section>
+                </fieldset>
+                <fieldset>
+                    <legend>Post details:</legend>
+                    <section>
+                        <label for="name">Name (leave blank for an unnamed post):</label>
+                        <input id="name" type="text">
+                    </section>
+                    <section>
+                        <label for="content">Content:</label>
+                        <textarea id="content" placeholder="Your post's text goes here"></textarea>
+                    </section>
+                    <section>
+                        <label for="category">Categories (separeted by commas):</label>
+                        <input id="category" type="text">
+                    </section>
+                    <fieldset>
+                        <legend>Channels</legend>
+                        <section>
+                            <input type="radio" id="no_channel" name="channel_select" checked value="">
+                            <label for="no_channel">Default channel only</label>
+                        </section>
+
+                        <section>
+                            <input type="radio" id="select_channels" name="channel_select" value="on">
+                            <label for="select_channels">Select channels manually</label>
+                        </section>
+                        
+                        <fieldset id="channels" style="display: none">
+                            <legend>Available channels:</legend>
+                            <template id="channel_selector">
+                                <section>
+                                    <input type="checkbox" name="channel" id="" value="">
+                                    <label for=""></label>
+                                </section>
+                            </template>
+                            <div id="channels_target"></div>
+                        </fieldset>
+                    </fieldset>
+                </fieldset>
+                <input type="submit">
+            </form>
+        </main>
+    </body>
+</html>
\ No newline at end of file
diff --git a/src/indieauth.rs b/src/indieauth.rs
new file mode 100644
index 0000000..8d41577
--- /dev/null
+++ b/src/indieauth.rs
@@ -0,0 +1,116 @@
+use log::{error,info};
+use std::future::Future;
+use std::pin::Pin;
+use url::Url;
+use tide::prelude::*;
+use tide::{Request, Response, Next, Result};
+
+use crate::database;
+use crate::ApplicationState;
+
+#[derive(Deserialize, Serialize, Debug, PartialEq)]
+pub struct User {
+    pub me: Url,
+    pub client_id: Url,
+    scope: String
+}
+
+impl User {
+    pub fn check_scope(&self, scope: &str) -> bool {
+        self.scopes().any(|i| i == scope)
+    }
+    pub fn scopes(&self) -> std::str::SplitAsciiWhitespace<'_> {
+        self.scope.split_ascii_whitespace()
+    }
+    #[cfg(test)]
+    pub fn new(me: &str, client_id: &str, scope: &str) -> Self {
+        Self {
+            me: Url::parse(me).unwrap(),
+            client_id: Url::parse(client_id).unwrap(),
+            scope: scope.to_string()
+        }
+    }
+}
+
+async fn get_token_data(token: String, token_endpoint: &http_types::Url, http_client: &surf::Client) -> (http_types::StatusCode, Option<User>) {
+    match http_client.get(token_endpoint).header("Authorization", token).header("Accept", "application/json").send().await {
+        Ok(mut resp) => {
+            if resp.status() == 200 {
+                match resp.body_json::<User>().await {
+                    Ok(user) => {
+                        info!("Token endpoint request successful. Validated user: {}", user.me);
+                        (resp.status(), Some(user))
+                    },
+                    Err(err) => {
+                        error!("Token endpoint parsing error (HTTP status {}): {}", resp.status(), err);
+                        (http_types::StatusCode::InternalServerError, None)
+                    }
+                }
+            } else {
+                error!("Token endpoint returned non-200: {}", resp.status());
+                (resp.status(), None)
+            }
+        }
+        Err(err) => {
+            error!("Token endpoint connection error: {}", err);
+            (http_types::StatusCode::InternalServerError, None)
+        }
+    }
+}
+
+// TODO: Figure out how to cache these authorization values - they can potentially take a lot of processing time
+pub fn check_auth<'a, Backend>(mut req: Request<ApplicationState<Backend>>, next: Next<'a, ApplicationState<Backend>>) -> Pin<Box<dyn Future<Output = Result> + Send + 'a>>
+where
+    Backend: database::Storage + Send + Sync + Clone
+{
+    Box::pin(async {
+        let header = req.header("Authorization");
+        match header {
+            None => {
+                Ok(Response::builder(401).body(json!({
+                    "error": "unauthorized",
+                    "error_description": "Please provide an access token."
+                })).build())
+            },
+            Some(value) => {
+                // TODO check the token
+                let endpoint = &req.state().token_endpoint;
+                let http_client = &req.state().http_client;
+                match get_token_data(value.last().to_string(), endpoint, http_client).await {
+                    (http_types::StatusCode::Ok, Some(user)) => {
+                        req.set_ext(user);
+                        Ok(next.run(req).await)
+                    },
+                    (http_types::StatusCode::InternalServerError, None) => {
+                        Ok(Response::builder(500).body(json!({
+                            "error": "token_endpoint_fail",
+                            "error_description": "Token endpoint made a boo-boo and refused to answer."
+                        })).build())
+                    },
+                    (_, None) => {
+                        Ok(Response::builder(401).body(json!({
+                            "error": "unauthorized",
+                            "error_description": "The token endpoint refused to accept your token."
+                        })).build())
+                    },
+                    (_, Some(_)) => {
+                        // This shouldn't happen.
+                        panic!("The token validation function has caught rabies and returns malformed responses. Aborting.");
+                    }
+                }
+            }
+        }
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn user_scopes_are_checkable() {
+        let user = User::new("https://fireburn.ru/", "https://quill.p3k.io/", "create update media");
+
+        assert!(user.check_scope("create"));
+        assert!(!user.check_scope("delete"));
+    }
+}
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..459ad23
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,276 @@
+#[cfg(debug_assertions)]
+use log::info;
+#[cfg(debug_assertions)]
+use serde::Deserialize;
+use tide::{Request, Response};
+
+mod database;
+mod indieauth;
+mod micropub;
+
+use crate::indieauth::check_auth;
+use crate::micropub::{get_handler,post_handler};
+
+#[derive(Clone)]
+pub struct ApplicationState<StorageBackend>
+where
+    StorageBackend: database::Storage + Send + Sync + 'static
+{
+    token_endpoint: surf::Url,
+    media_endpoint: Option<String>,
+    http_client: surf::Client,
+    storage: StorageBackend
+}
+
+type App<Storage> = tide::Server<ApplicationState<Storage>>;
+
+static INDEX_PAGE: &[u8] = include_bytes!("./index.html");
+
+#[cfg(debug_assertions)]
+#[derive(Deserialize)]
+struct Mf2JsonQuery {
+    url: String,
+    limit: usize,
+    user: Option<String>,
+    after: Option<String>
+}
+
+fn equip_app<Storage>(mut app: App<Storage>) -> App<Storage>
+where
+    Storage: database::Storage + Send + Sync + Clone
+{
+    app.at("/").get(|_: Request<_>| async move {
+        Ok(Response::builder(200).body(INDEX_PAGE).content_type("text/html").build())
+    });
+    app.at("/micropub").with(check_auth).get(get_handler).post(post_handler);
+    #[cfg(debug_assertions)]
+    info!("Outfitting app with the debug function");
+    #[cfg(debug_assertions)]
+    app.at("/mf2-json").get(|req: Request<ApplicationState<Storage>>| async move {
+        info!("DEBUG FUNCTION: Reading MF2-JSON");
+        let backend = &req.state().storage;
+        let query = req.query::<Mf2JsonQuery>()?;
+        match backend.read_feed_with_limit(&query.url, &query.after, query.limit, &query.user).await {
+            Ok(result) => match result {
+                Some(post) => Ok(Response::builder(200).body(post).build()),
+                None => Ok(Response::builder(404).build())
+            },
+            Err(err) => match err.kind() {
+                database::ErrorKind::PermissionDenied => {
+                    if let Some(_) = query.user {
+                        Ok(Response::builder(403).build())
+                    } else {
+                        Ok(Response::builder(401).build())
+                    }
+                }
+                _ => Ok(Response::builder(500).body(serde_json::json!({"error": "database_error", "error_description": format!("{}", err)})).build())
+            }
+        }
+    });
+
+    return app
+}
+
+pub async fn get_app_with_redis(token_endpoint: surf::Url, redis_uri: String, media_endpoint: Option<String>) -> App<database::RedisStorage> {
+    let app = tide::with_state(ApplicationState { 
+        token_endpoint, media_endpoint,
+        storage: database::RedisStorage::new(redis_uri).await.unwrap(),
+        http_client: surf::Client::new(),
+    });
+    
+    equip_app(app)
+}
+
+#[cfg(test)]
+pub async fn get_app_with_memory_for_testing(token_endpoint: surf::Url) -> (database::MemoryStorage, App<database::MemoryStorage>) {
+    let database = database::MemoryStorage::new();
+    let app = tide::with_state(ApplicationState {
+        token_endpoint, media_endpoint: None,
+        storage: database.clone(),
+        http_client: surf::Client::new(),
+    });
+
+    return (database, equip_app(app))
+}
+
+#[cfg(test)]
+#[allow(unused_variables,unused_imports)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+    use tide_testing::TideTestingExt;
+    use crate::database::Storage;
+    use mockito::mock;
+
+    async fn create_app() -> (database::MemoryStorage, App<database::MemoryStorage>) {
+        get_app_with_memory_for_testing(surf::Url::parse(&*mockito::server_url()).unwrap()).await
+    }
+    #[async_std::test]
+    async fn test_no_posting_to_others_websites() {
+        let _m = mock("GET", "/")
+            .with_status(200)
+            .with_header("Content-Type", "application/json")
+            .with_body(r#"{"me": "https://fireburn.ru", "client_id": "https://quill.p3k.io/", "scope": "create update media"}"#)
+            .create();
+
+            let (db, app) = create_app().await;
+
+            let request: surf::RequestBuilder = app.post("/micropub")
+                .header("Authorization", "Bearer test")
+                .header("Content-Type", "application/json")
+                .body(json!({
+                    "type": ["h-entry"],
+                    "properties": {
+                        "content": ["Fake news about Aaron Parecki!"],
+                        "uid": ["https://aaronparecki.com/posts/fake-news"]
+                    }
+                }));
+            let response = request.send().await.unwrap();
+            assert_eq!(response.status(), 403);
+
+            let request: surf::RequestBuilder = app.post("/micropub")
+                .header("Authorization", "Bearer test")
+                .header("Content-Type", "application/json")
+                .body(json!({
+                    "type": ["h-entry"],
+                    "properties": {
+                        "content": ["More fake news about Aaron Parecki!"],
+                        "url": ["https://aaronparecki.com/posts/more-fake-news"]
+                    }
+                }));
+            let response = request.send().await.unwrap();
+            assert_eq!(response.status(), 403);
+
+            let request: surf::RequestBuilder = app.post("/micropub")
+                .header("Authorization", "Bearer test")
+                .header("Content-Type", "application/json")
+                .body(json!({
+                    "type": ["h-entry"],
+                    "properties": {
+                        "content": ["Sneaky advertisement designed to creep into someone else's feed! Buy whatever I'm promoting!"],
+                        "channel": ["https://aaronparecki.com/feeds/main"]
+                    }
+                }));
+            let response = request.send().await.unwrap();
+            assert_eq!(response.status(), 403);
+    }
+
+    #[async_std::test]
+    async fn test_successful_authorization() {
+        let _m = mock("GET", "/")
+            .with_status(200)
+            .with_header("Content-Type", "application/json")
+            .with_body(r#"{"me": "https://fireburn.ru", "client_id": "https://quill.p3k.io/", "scope": "create update media"}"#)
+            .create();
+
+        let (db, app) = create_app().await;
+
+        let response: serde_json::Value = app.get("/micropub?q=config")
+            .header("Authorization", "test")
+            .recv_json().await.unwrap();
+        assert!(!response["q"].as_array().unwrap().is_empty());
+    }
+
+    #[async_std::test]
+    async fn test_unsuccessful_authorization() {
+        let _m = mock("GET", "/")
+            .with_status(400)
+            .with_header("Content-Type", "application/json")
+            .with_body(r#"{"error":"unauthorized","error_description":"A valid access token is required."}"#)
+            .create();
+
+        let (db, app) = create_app().await;
+
+        let response: surf::Response = app.get("/micropub?q=config")
+            .header("Authorization", "test")
+            .send().await.unwrap();
+        assert_eq!(response.status(), 401);
+    }
+
+    #[async_std::test]
+    async fn test_no_auth_header() {
+        let (db, app) = create_app().await;
+
+        let request: surf::RequestBuilder = app.get("/micropub?q=config");
+        let response: surf::Response = request.send().await.unwrap();
+        assert_eq!(response.status(), 401);
+    }
+
+    #[async_std::test]
+    async fn test_create_post_form_encoded() {
+        let _m = mock("GET", "/")
+            .with_status(200)
+            .with_header("Content-Type", "application/json")
+            .with_body(r#"{"me": "https://fireburn.ru", "client_id": "https://quill.p3k.io/", "scope": "create update media"}"#)
+            .create();
+
+        let (storage, app) = create_app().await;
+
+        let request: surf::RequestBuilder = app.post("/micropub")
+            .header("Authorization", "Bearer test")
+            .header("Content-Type", "application/x-www-form-urlencoded")
+            .body("h=entry&content=something%20interesting&category[]=test&category[]=stuff");
+        let mut response: surf::Response = request.send().await.unwrap();
+        println!("{:#}", response.body_json::<serde_json::Value>().await.unwrap());
+        assert!(response.status() == 201 || response.status() == 202);
+        let uid = response.header("Location").unwrap().last().to_string();
+        // Assume the post is in the database at this point.
+        let post = storage.get_post(&uid).await.unwrap().unwrap();
+        assert_eq!(post["properties"]["content"][0]["html"].as_str().unwrap().trim(), "<p>something interesting</p>");
+    }
+
+    #[async_std::test]
+    async fn test_create_post_json() {
+        let _m = mock("GET", "/")
+            .with_status(200)
+            .with_header("Content-Type", "application/json")
+            .with_body(r#"{"me": "https://fireburn.ru", "client_id": "https://quill.p3k.io/", "scope": "create update media"}"#)
+            .create();
+
+        let (storage, app) = create_app().await;
+
+        let request: surf::RequestBuilder = app.post("/micropub")
+            .header("Authorization", "Bearer test")
+            .header("Content-Type", "application/json")
+            .body(json!({
+                "type": ["h-entry"],
+                "properties": {
+                    "content": ["This is content!"]
+                }
+            }));
+        let mut response: surf::Response = request.send().await.unwrap();
+        println!("{:#}", response.body_json::<serde_json::Value>().await.unwrap());
+        assert!(response.status() == 201 || response.status() == 202);
+        let uid = response.header("Location").unwrap().last().to_string();
+        // Assume the post is in the database at this point.
+        let post = storage.get_post(&uid).await.unwrap().unwrap();
+        assert_eq!(post["properties"]["content"][0]["html"].as_str().unwrap().trim(), "<p>This is content!</p>");
+        let feed = storage.get_post("https://fireburn.ru/feeds/main").await.unwrap().unwrap();
+        assert_eq!(feed["children"].as_array().unwrap().len(), 1);
+        assert_eq!(feed["children"][0].as_str().unwrap(), uid);
+
+        let request: surf::RequestBuilder = app.post("/micropub")
+            .header("Authorization", "Bearer test")
+            .header("Content-Type", "application/json")
+            .body(json!({
+                "type": ["h-entry"],
+                "properties": {
+                    "content": ["#moar content for you!"]
+                }
+            }));
+
+        let first_uid = uid;
+
+        let mut response: surf::Response = request.send().await.unwrap();
+        println!("{:#}", response.body_json::<serde_json::Value>().await.unwrap());
+        assert!(response.status() == 201 || response.status() == 202);
+        let uid = response.header("Location").unwrap().last().to_string();
+        // Assume the post is in the database at this point.
+        println!("Keys in database: {:?}", storage.mapping.read().await.keys());
+        let new_feed = storage.get_post("https://fireburn.ru/feeds/main").await.unwrap().unwrap();
+        println!("{}", new_feed["children"]);
+        assert_eq!(new_feed["children"].as_array().unwrap().len(), 2);
+        assert_eq!(new_feed["children"][0].as_str().unwrap(), uid);
+        assert_eq!(new_feed["children"][1].as_str().unwrap(), first_uid);
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..3d0831e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,48 @@
+use std::env;
+use log::{error,info,debug};
+use env_logger;
+use surf::Url;
+use kittybox_micropub as micropub;
+
+#[async_std::main]
+async fn main() -> Result<(), std::io::Error> {
+    // TODO json logging in the future?
+    let logger_env = env_logger::Env::new().filter_or("RUST_LOG", "info");
+    env_logger::init_from_env(logger_env);
+
+    info!("Starting the Micropub server...");
+
+    let redis_uri: String;
+    match env::var("REDIS_URI") {
+        Ok(val) => {
+            debug!("Redis connection: {}", val);
+            redis_uri = val
+        },
+        Err(_) => {
+            error!("REDIS_URI is not set, cannot find a database");
+            std::process::exit(1);
+        }
+    };
+    let token_endpoint: Url;
+    match env::var("TOKEN_ENDPOINT") {
+        Ok(val) => {
+            debug!("Token endpoint: {}", val);
+            match Url::parse(&val) {
+                Ok(val) => token_endpoint = val,
+                _ => {
+                    error!("Token endpoint URL cannot be parsed, aborting.");
+                    std::process::exit(1)
+                }
+            }
+        }
+        Err(_) => {
+            error!("TOKEN_ENDPOINT is not set, will not be able to authorize users!");
+            std::process::exit(1)
+        }
+    }
+    let media_endpoint: Option<String> = env::var("MEDIA_ENDPOINT").ok();
+
+    let host = env::var("SERVE_AT").ok().unwrap_or("0.0.0.0:8080".to_string());
+    let app = micropub::get_app_with_redis(token_endpoint, redis_uri, media_endpoint).await;
+    app.listen(host).await
+}
\ No newline at end of file
diff --git a/src/micropub/get.rs b/src/micropub/get.rs
new file mode 100644
index 0000000..9a12316
--- /dev/null
+++ b/src/micropub/get.rs
@@ -0,0 +1,86 @@
+use tide::prelude::{Deserialize, json};
+use tide::{Request, Response, Result};
+use crate::ApplicationState;
+use crate::database::{MicropubChannel,Storage};
+use crate::indieauth::User;
+
+#[derive(Deserialize)]
+struct QueryOptions {
+    q: String,
+    url: Option<String>
+}
+
+pub async fn get_handler<Backend>(req: Request<ApplicationState<Backend>>) -> Result
+where
+    Backend: Storage + Send + Sync
+{
+    let user = req.ext::<User>().unwrap();
+    let backend = &req.state().storage;
+    let media_endpoint = &req.state().media_endpoint;
+    let query = req.query::<QueryOptions>().unwrap_or(QueryOptions { q: "".to_string(), url: None });
+    match &*query.q {
+        "config" => {
+            let channels: Vec<MicropubChannel>;
+            match backend.get_channels(&user).await {
+                Ok(chans) => channels = chans,
+                Err(err) => return Ok(Response::builder(500).body(json!({
+                    "error": "database_error",
+                    "error_description": format!("Couldn't fetch channel list from the database: {:?}", err)
+                })).build())
+            }
+            Ok(Response::builder(200).body(json!({
+                "q": ["source", "config", "channel"],
+                "channels": channels,
+                "media-endpoint": media_endpoint
+            })).build())
+        },
+        "channel" => {
+            let channels: Vec<MicropubChannel>;
+            match backend.get_channels(&user).await {
+                Ok(chans) => channels = chans,
+                Err(err) => return Ok(Response::builder(500).body(json!({
+                    "error": "database_error",
+                    "error_description": format!("Couldn't fetch channel list from the database: {:?}", err)
+                })).build())
+            }
+            return Ok(Response::builder(200).body(json!(channels)).build())
+        }
+        "source" => {
+            if user.check_scope("create") || user.check_scope("update") || user.check_scope("delete") || user.check_scope("undelete") {
+                if let Some(url) = query.url {
+                    match backend.get_post(&url).await {
+                        Ok(post) => if let Some(post) = post {
+                            return Ok(Response::builder(200).body(post).build())
+                        } else {
+                            return Ok(Response::builder(404).build())
+                        },
+                        Err(err) => return Ok(Response::builder(500).body(json!({
+                            "error": "database_error",
+                            "error_description": err
+                        })).build())
+                    }
+                } else {
+                    return Ok(Response::builder(400).body(json!({
+                        "error": "invalid_request",
+                        "error_description": "Please provide `url`."
+                    })).build())
+                }
+            } else {
+                Ok(Response::builder(401).body(json!({
+                    "error": "insufficient_scope",
+                    "error_description": "You don't have the required scopes to proceed.",
+                    "scope": "update"
+                })).build())
+            }
+        },
+        // Errors
+        "" => Ok(Response::builder(400).body(json!({
+            "error": "invalid_request",
+            "error_description": "No ?q= parameter specified. Try ?q=config maybe?"
+        })).build()),
+        _ => Ok(Response::builder(400).body(json!({
+            "error": "invalid_request",
+            "error_description": "Unsupported ?q= query. Try ?q=config and see the q array for supported values."
+        })).build())
+    }
+}
diff --git a/src/micropub/mod.rs b/src/micropub/mod.rs
new file mode 100644
index 0000000..ec5cd87
--- /dev/null
+++ b/src/micropub/mod.rs
@@ -0,0 +1,5 @@
+mod get;
+mod post;
+
+pub use get::get_handler;
+pub use post::post_handler;
\ No newline at end of file
diff --git a/src/micropub/post.rs b/src/micropub/post.rs
new file mode 100644
index 0000000..38b205b
--- /dev/null
+++ b/src/micropub/post.rs
@@ -0,0 +1,433 @@
+use core::iter::Iterator;
+use std::str::FromStr;
+use std::convert::TryInto;
+use async_std::sync::RwLockUpgradableReadGuard;
+use chrono::prelude::*;
+use http_types::Mime;
+use tide::prelude::json;
+use tide::{Request, Response, Result};
+use newbase60::num_to_sxg;
+use crate::ApplicationState;
+use crate::database::{Storage};
+use crate::indieauth::User;
+
+static DEFAULT_CHANNEL_PATH: &str = "/feeds/main";
+static DEFAULT_CHANNEL_NAME: &str = "Main feed";
+
+macro_rules! response {
+    ($($code:expr, $json:tt)+) => {
+        $(
+            Ok(Response::builder($code).body(json!($json)).build())
+        )+
+    };
+}
+
+macro_rules! error_json {
+    ($($code:expr, $error:expr, $error_desc:expr)+) => {
+        $(
+            response!($code, {
+                "error": $error,
+                "error_description": $error_desc
+            })
+        )+
+    }
+}
+
+fn get_folder_from_type(post_type: &str) -> String {
+    (match post_type {
+        "h-feed" => "feeds/",
+        "h-event" => "events/",
+        _ => "posts/"
+    }).to_string()
+}
+
+fn normalize_mf2<'a>(mut body: serde_json::Value, user: &User) -> (String, serde_json::Value) {
+    // Normalize the MF2 object here.
+    let me = &user.me;
+    let published: DateTime<FixedOffset>;
+    let folder = get_folder_from_type(body["type"][0].as_str().unwrap());
+    if let Some(dt) = body["properties"]["published"][0].as_str() {
+        // Check if the datetime is parsable.
+        match DateTime::parse_from_rfc3339(dt) {
+            Ok(dt) => {
+                published = dt;
+            }
+            Err(_) => {
+                // Reset the datetime to a proper datetime.
+                // Do not attempt to recover the information.
+                // Do not pass GO. Do not collect $200.
+                let curtime: DateTime<Local> = Local::now();
+                body["properties"]["published"] = serde_json::Value::Array(vec![
+                    serde_json::Value::String(curtime.to_rfc3339())
+                ]);
+                published = chrono::DateTime::from(curtime);
+            }
+        }
+    } else {
+        // Set the datetime.
+        let curtime: DateTime<Local> = Local::now();
+        body["properties"]["published"] = serde_json::Value::Array(vec![
+            serde_json::Value::String(curtime.to_rfc3339())
+        ]);
+        published = chrono::DateTime::from(curtime);
+    }
+    match body["properties"]["uid"][0].as_str() {
+        None => {
+            let uid = serde_json::Value::String(
+                me.join(
+                    &(folder.clone() + &num_to_sxg(published.timestamp_millis().try_into().unwrap()))
+                ).unwrap().to_string());
+            body["properties"]["uid"] = serde_json::Value::Array(vec![uid.clone()]);
+            match body["properties"]["url"].as_array_mut() {
+                Some(array) => {
+                    array.push(uid)
+                }
+                None => {
+                    body["properties"]["url"] = body["properties"]["uid"].clone()
+                }
+            }
+        }
+        Some(uid_str) => {
+            let uid = uid_str.to_string();
+            match body["properties"]["url"].as_array_mut() {
+                Some(array) => {
+                    if !array.iter().any(|i| i.as_str().unwrap_or("") == uid) {
+                        array.push(serde_json::Value::String(uid.to_string()))
+                    }
+                }
+                None => {
+                    body["properties"]["url"] = body["properties"]["uid"].clone()
+                }
+            }
+        }
+    }
+    if let Some(slugs) = body["properties"]["mp-slug"].as_array() {
+        let new_urls = slugs.iter()
+            .map(|i| i.as_str().unwrap_or(""))
+            .filter(|i| i != &"")
+            .map(|i| me.join(&((&folder).clone() + i)).unwrap().to_string())
+            .collect::<Vec<String>>();
+        let urls = body["properties"]["url"].as_array_mut().unwrap();
+        new_urls.iter().for_each(|i| urls.push(json!(i)));
+    }
+    let props = body["properties"].as_object_mut().unwrap();
+    props.remove("mp-slug");
+
+    if body["properties"]["content"][0].is_string() {
+        // Convert the content to HTML using the `markdown` crate
+        body["properties"]["content"] = json!([{
+            "html": markdown::to_html(body["properties"]["content"][0].as_str().unwrap()),
+            "value": body["properties"]["content"][0]
+        }])
+    }
+    if body["properties"]["channel"][0].as_str().is_none() && body["type"][0] != "h-feed" {
+        // Set the channel to the main channel...
+        let default_channel = me.join("/feeds/main").unwrap().to_string();
+
+        body["properties"]["channel"] = json!([default_channel]);
+    }
+    body["properties"]["posted-with"] = json!([user.client_id]);
+    if let None = body["properties"]["author"][0].as_str() {
+        body["properties"]["author"] = json!([me.as_str()])
+    }
+    // TODO: maybe highlight #hashtags?
+    // Find other processing to do and insert it here
+    return (body["properties"]["uid"][0].as_str().unwrap().to_string(), body)
+}
+
+async fn new_post<S: Storage>(req: Request<ApplicationState<S>>, body: serde_json::Value) -> Result {
+    // First, check for rights.
+    let user = req.ext::<User>().unwrap();
+    if !user.check_scope("create") {
+        return error_json!(401, "invalid_scope", "Not enough privileges to post. Try a token with a \"create\" scope instead.")
+    }
+    let (uid, post) = normalize_mf2(body, user);
+
+    // Security check!
+    // This software might also be used in a multi-user setting
+    // where several users or identities share one Micropub server
+    // (maybe a family website or a shitpost sideblog?)
+    if post["properties"]["url"].as_array().unwrap().iter().any(|url| !url.as_str().unwrap().starts_with(user.me.as_str()))
+        || !post["properties"]["uid"][0].as_str().unwrap().starts_with(user.me.as_str())
+        || post["properties"]["channel"].as_array().unwrap().iter().any(|url| !url.as_str().unwrap().starts_with(user.me.as_str()))
+    {
+        return error_json!(403, "forbidden", "You're trying to post to someone else's website...")
+    }
+
+    let storage = &req.state().storage;
+    match storage.post_exists(&uid).await {
+        Ok(exists) => if exists {
+            return error_json!(409, "already_exists", format!("A post with the exact same UID already exists in the database: {}", uid))
+        },
+        Err(err) => return error_json!(500, "database_error", err)
+    }
+    // WARNING: WRITE BOUNDARY
+    //let mut storage = RwLockUpgradableReadGuard::upgrade(storage).await;
+    if let Err(err) = storage.put_post(&post).await {
+        return error_json!(500, "database_error", format!("{}", err))
+    }
+    for channel in post["properties"]["channel"]
+        .as_array().unwrap().iter()
+        .map(|i| i.as_str().unwrap_or("").to_string())
+        .filter(|i| i != "")
+        .collect::<Vec<_>>()
+    {
+        let default_channel = user.me.join(DEFAULT_CHANNEL_PATH).unwrap().to_string();
+        match storage.post_exists(&channel).await {
+            Ok(exists) => if exists {
+                if let Err(err) = storage.update_post(&channel, json!({
+                    "add": {
+                        "children": [uid]
+                    }
+                })).await {
+                    return error_json!(500, "database_error", format!("Couldn't insert post into the channel due to a database error: {}", err))
+                }
+            } else if channel == default_channel {
+                let (_, feed) = normalize_mf2(json!({
+                    "type": ["h-feed"],
+                    "properties": {
+                        "name": [DEFAULT_CHANNEL_NAME],
+                        "mp-slug": ["main"],
+                    },
+                    "children": [uid]
+                }), &user);
+                if let Err(err) = storage.put_post(&feed).await {
+                    return error_json!(500, "database_error", format!("Couldn't save feed: {}", err))
+                }
+            },
+            Err(err) => return error_json!(500, "database_error", err)
+        }
+    }
+    // END WRITE BOUNDARY
+    //drop(storage);
+    // TODO: Post-processing the post (aka second write pass)
+    // - [ ] Send webmentions
+    // - [ ] Download rich reply contexts
+    // - [ ] Send WebSub notifications to the hub (if we happen to have one)
+    // - [ ] Syndicate the post if requested, add links to the syndicated copies
+
+    return Ok(Response::builder(202)
+        .header("Location", &uid)
+        .body(json!({"status": "accepted", "location": &uid}))
+        .build());
+}
+
+async fn process_json<S: Storage>(req: Request<ApplicationState<S>>, body: serde_json::Value) -> Result {
+    let is_action = body["action"].is_string() && body["url"].is_string();
+    if is_action {
+        // This could be an update, a deletion or an undeletion request.
+        // Process it separately.
+        let action = body["action"].as_str().unwrap();
+        let url = body["url"].as_str().unwrap();
+        let user = req.ext::<User>().unwrap();
+        match action {
+            "delete" => {
+                if !user.check_scope("delete") {
+                    return error_json!(401, "insufficient_scope", "You need a `delete` scope to delete posts.")
+                }
+                if let Err(error) = req.state().storage.delete_post(&url).await {
+                    return error_json!(500, "database_error", error)
+                }
+                return Ok(Response::builder(200).build());
+            },
+            "update" => {
+                if !user.check_scope("update") {
+                    return error_json!(401, "insufficient_scope", "You need an `update` scope to update posts.")
+                }
+                if let Err(error) = req.state().storage.update_post(&url, body.clone()).await {
+                    return error_json!(500, "database_error", error)
+                } else {
+                    return Ok(Response::builder(204).build())
+                }
+            },
+            _ => {
+                return error_json!(400, "invalid_request", "This action is not supported.")
+            }
+        }
+    } else if let Some(_) = body["type"][0].as_str() {
+        // This is definitely an h-entry or something similar. Check if it has properties?
+        if let Some(_) = body["properties"].as_object() {
+            // Ok, this is definitely a new h-entry. Let's save it.
+            return new_post(req, body).await
+        } else {
+            return error_json!(400, "invalid_request", "This MF2-JSON object has a type, but not properties. This makes no sense to post.")
+        }
+    } else {
+        return error_json!(400, "invalid_request", "Try sending MF2-structured data or an object with an \"action\" and \"url\" keys.")
+    }
+}
+
+fn convert_form_to_mf2_json(form: Vec<(String, String)>) -> serde_json::Value {
+    let mut mf2 = json!({"type": [], "properties": {}});
+    for (k, v) in form {
+        if k == "h" {
+            mf2["type"].as_array_mut().unwrap().push(json!("h-".to_string() + &v));
+        } else if k != "access_token" {
+            let key = k.strip_suffix("[]").unwrap_or(&k);
+            match mf2["properties"][key].as_array_mut() {
+                Some(prop) => prop.push(json!(v)),
+                None => mf2["properties"][key] = json!([v])
+            }
+        }
+    }
+    if mf2["type"].as_array().unwrap().len() == 0 {
+        mf2["type"].as_array_mut().unwrap().push(json!("h-entry"));
+    }
+    return mf2
+}
+
+async fn process_form<S: Storage>(req: Request<ApplicationState<S>>, form: Vec<(String, String)>) -> Result {
+    if let Some((_, v)) = form.iter().find(|(k, _)| k == "action") {
+        if v == "delete" {
+            let user = req.ext::<User>().unwrap();
+            if !user.check_scope("delete") {
+                return error_json!(401, "insufficient_scope", "You cannot delete posts without a `delete` scope.")
+            }
+            match form.iter().find(|(k, _)| k == "url") {
+                Some((_, url)) => {
+                    if let Err(error) = req.state().storage.delete_post(&url).await {
+                        return error_json!(500, "database_error", error)
+                    }
+                    return Ok(Response::builder(200).build())
+                },
+                None => return error_json!(400, "invalid_request", "Please provide an `url` to delete.")
+            }
+        } else {
+            return error_json!(400, "invalid_request", "This action is not supported in form-encoded mode. (JSON requests support more actions, use them!)")
+        }
+    }
+    
+    let mf2 = convert_form_to_mf2_json(form);
+
+    if mf2["properties"].as_object().unwrap().keys().len() > 0 {
+        return new_post(req, mf2).await;
+    }
+    return error_json!(400, "invalid_request", "Try sending h=entry&content=something%20interesting");
+}
+
+pub async fn post_handler<S: Storage>(mut req: Request<ApplicationState<S>>) -> Result {
+    match req.content_type() {
+        Some(value) => {
+            if value == Mime::from_str("application/json").unwrap() {
+                match req.body_json::<serde_json::Value>().await {
+                    Ok(parsed) => {
+                        return process_json(req, parsed).await
+                    },
+                    Err(err) => return error_json!(
+                        400, "invalid_request",
+                        format!("Parsing JSON failed: {:?}", err)
+                    )
+                }
+            } else if value == Mime::from_str("application/x-www-form-urlencoded").unwrap() {
+                match req.body_form::<Vec<(String, String)>>().await {
+                    Ok(parsed) => {
+                        return process_form(req, parsed).await
+                    },
+                    Err(err) => return error_json!(
+                        400, "invalid_request",
+                        format!("Parsing form failed: {:?}", err)
+                    )
+                }
+            } else {
+                return error_json!(
+                    415, "unsupported_media_type",
+                    "What's this? Try sending JSON instead. (urlencoded form also works but is less cute)"
+                )
+            }
+        }
+        _ => {
+            return error_json!(
+                415, "unsupported_media_type",
+                "You didn't send a Content-Type header, so we don't know how to parse your request."
+            );
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_form_to_mf2() {
+        use serde_urlencoded::from_str;
+
+        assert_eq!(
+            convert_form_to_mf2_json(from_str("h=entry&content=something%20interesting").unwrap()), 
+            json!({
+                "type": ["h-entry"],
+                "properties": {
+                    "content": ["something interesting"]
+                }
+            })
+        )
+    }
+
+    #[test]
+    fn test_normalize_mf2() {
+        let mf2 = json!({
+            "type": ["h-entry"],
+            "properties": {
+                "content": ["This is content!"]
+            }
+        });
+
+        let (uid, post) = normalize_mf2(mf2, &User::new("https://fireburn.ru/", "https://quill.p3k.io/", "create update media"));
+        assert!(post["properties"]["published"].as_array().unwrap().len() > 0);
+        DateTime::parse_from_rfc3339(post["properties"]["published"][0].as_str().unwrap()).unwrap();
+        assert!(post["properties"]["url"].as_array().unwrap().len() > 0);
+        assert!(post["properties"]["uid"].as_array().unwrap().len() > 0);
+        assert_eq!(post["properties"]["uid"][0].as_str().unwrap(), &uid);
+        assert!(uid.starts_with("https://fireburn.ru/posts/"));
+        assert_eq!(post["properties"]["content"][0]["html"].as_str().unwrap().trim(), "<p>This is content!</p>");
+        assert_eq!(post["properties"]["channel"][0], "https://fireburn.ru/feeds/main");
+        assert_eq!(post["properties"]["author"][0], "https://fireburn.ru/");
+    }
+
+    #[test]
+    fn test_mp_slug() {
+        let mf2 = json!({
+            "type": ["h-entry"],
+            "properties": {
+                "content": ["This is content!"],
+                "mp-slug": ["hello-post"]
+            },
+        });
+
+        let (_, post) = normalize_mf2(mf2, &User::new("https://fireburn.ru/", "https://quill.p3k.io/", "create update media"));
+        assert!(post["properties"]["url"]
+            .as_array()
+            .unwrap()
+            .iter()
+            .map(|i| i.as_str().unwrap())
+            .any(|i| i == "https://fireburn.ru/posts/hello-post")
+        );
+        if let Some(_) = post["properties"]["mp-slug"].as_array() {
+            panic!("mp-slug wasn't deleted from the array!")
+        }
+    }
+
+    #[test]
+    fn test_normalize_feed() {
+        let mf2 = json!({
+            "type": ["h-feed"],
+            "properties": {
+                "name": "Main feed",
+                "mp-slug": ["main"]
+            }
+        });
+
+        let (uid, post) = normalize_mf2(mf2, &User::new("https://fireburn.ru/", "https://quill.p3k.io/", "create update media"));
+        assert_eq!(post["properties"]["uid"][0].as_str().unwrap(), &uid);
+        assert_eq!(post["properties"]["author"][0], "https://fireburn.ru/");
+        assert!(post["properties"]["url"]
+            .as_array()
+            .unwrap()
+            .iter()
+            .map(|i| i.as_str().unwrap())
+            .any(|i| i == "https://fireburn.ru/feeds/main"));
+        if let Some(_) = post["properties"]["mp-slug"].as_array() {
+            panic!("mp-slug wasn't deleted from the array!")
+        }
+    }
+}
\ No newline at end of file