1 files changed, 173 insertions, 0 deletions
diff --git a/src/database/file/mod.rs b/src/database/file/mod.rs
new file mode 100644
index 0000000..36300fc
--- /dev/null
+++ b/src/database/file/mod.rs
@@ -0,0 +1,173 @@
+//pub mod async_file_ext;
+use async_std::fs::{File, OpenOptions};
+use async_std::io::{ErrorKind as IOErrorKind, BufReader};
+use async_std::io::prelude::*;
+use async_std::task::spawn_blocking;
+use async_trait::async_trait;
+use crate::database::{ErrorKind, Result, Storage, StorageError};
+use fd_lock::RwLock;
+use log::debug;
+use std::path::{Path, PathBuf};
+
+impl From<std::io::Error> for StorageError {
+    fn from(source: std::io::Error) -> Self {
+        Self::with_source(
+            match source.kind() {
+                IOErrorKind::NotFound => ErrorKind::NotFound,
+                _ => ErrorKind::Backend,
+            },
+            "file I/O error",
+            Box::new(source),
+        )
+    }
+}
+
+async fn get_lockable_file(file: File) -> RwLock<File> {
+    debug!("Trying to create a file lock");
+    spawn_blocking(move || RwLock::new(file)).await
+}
+
+fn url_to_path(root: &Path, url: &str) -> PathBuf {
+    let url = http_types::Url::parse(url).expect("Couldn't parse a URL");
+    let mut path: PathBuf = root.to_owned();
+    path.push(url.origin().ascii_serialization() + &url.path().to_string() + ".json");
+
+    path
+}
+
+#[derive(Clone)]
+pub struct FileStorage {
+    root_dir: PathBuf,
+}
+
+impl FileStorage {
+    pub async fn new(root_dir: PathBuf) -> Result<Self> {
+        // TODO check if the dir is writable
+        Ok(Self { root_dir })
+    }
+}
+
+#[async_trait]
+impl Storage for FileStorage {
+    async fn post_exists(&self, url: &str) -> Result<bool> {
+        let path = url_to_path(&self.root_dir, url);
+        debug!("Checking if {:?} exists...", path);
+        Ok(spawn_blocking(move || path.is_file()).await)
+    }
+
+    async fn get_post(&self, url: &str) -> Result<Option<serde_json::Value>> {
+        let path = url_to_path(&self.root_dir, url);
+        debug!("Opening {:?}", path);
+        // We have to special-case in here because the function should return Ok(None) on 404
+        match File::open(path).await {
+            Ok(f) => {
+                let lock = get_lockable_file(f).await;
+                let guard = lock.read()?;
+
+                // HOW DOES THIS TYPECHECK?!!!!!!!!
+                // Read::read(&mut self) requires a mutable reference
+                // yet Read is implemented for &File
+                // We can't get a &mut File from &File, can we?
+                // And we need a &mut File to use Read::read_to_string()
+                // Yet if we pass it to a BufReader it works?!!
+                //
+                // I hate magic
+                //
+                // TODO find a way to get rid of BufReader here
+                let mut content = String::new();
+                let mut reader = BufReader::new(&*guard);
+                reader.read_to_string(&mut content).await?;
+                drop(reader);
+                drop(guard);
+                Ok(Some(serde_json::from_str(&content)?))
+            }
+            Err(err) => {
+                if err.kind() == IOErrorKind::NotFound {
+                    Ok(None)
+                } else {
+                    Err(err.into())
+                }
+            }
+        }
+    }
+
+    async fn put_post<'a>(&self, post: &'a serde_json::Value, user: &'a str) -> Result<()> {
+        let key = post["properties"]["uid"][0]
+        .as_str()
+        .expect("Tried to save a post without UID");
+        let path = url_to_path(&self.root_dir, key);
+
+        debug!("Creating {:?}", path);
+
+        let parent = path.parent().unwrap().to_owned();
+        if !spawn_blocking(move || parent.is_dir()).await {
+            async_std::fs::create_dir_all(path.parent().unwrap()).await?;
+        }
+
+        let f = OpenOptions::new()
+            .write(true)
+            .create_new(true)
+            .open(&path)
+            .await?;
+        
+        let mut lock = get_lockable_file(f).await;
+        let mut guard = lock.write()?;
+
+        (*guard).write(post.to_string().as_bytes()).await?;
+        drop(guard);
+
+        if post["properties"]["url"].is_array() {
+            for url in post["properties"]["url"]
+                .as_array()
+                .unwrap()
+                .iter()
+                .map(|i| i.as_str().unwrap())
+            {
+                // TODO consider using the symlink crate
+                // to promote cross-platform compat on Windows
+                // do we even need to support Windows?...
+                if url != key && url.starts_with(user) {
+                    let link = url_to_path(&self.root_dir, url);
+                    debug!("Creating a symlink at {:?}", link);
+                    let orig = path.clone();
+                    spawn_blocking(move || { std::os::unix::fs::symlink(orig, link) }).await?;
+                }
+            }
+        }
+
+        Ok(())
+    }
+
+    async fn update_post<'a>(&self, url: &'a str, update: serde_json::Value) -> Result<()> {
+        todo!()
+    }
+
+    async fn get_channels(
+        &self,
+        user: &crate::indieauth::User,
+    ) -> Result<Vec<super::MicropubChannel>> {
+        todo!()
+    }
+
+    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 delete_post<'a>(&self, url: &'a str) -> Result<()> {
+        todo!()
+    }
+
+    async fn get_setting<'a>(&self, setting: &'a str, user: &'a str) -> Result<String> {
+        todo!()
+    }
+
+    async fn set_setting<'a>(&self, setting: &'a str, user: &'a str, value: &'a str) -> Result<()> {
+        todo!()
+    }
+}