Make the settings in the database a strong type

3 files changed, 28 insertions, 10 deletions

diff --git a/src/database/file/mod.rs b/src/database/file/mod.rs
index af07c0c..b3856a6 100644
--- a/src/database/file/mod.rs
+++ b/src/database/file/mod.rs
@@ -1,5 +1,5 @@
 //#![warn(clippy::unwrap_used)]
-use crate::database::{filter_post, ErrorKind, Result, Storage, StorageError};
+use crate::database::{filter_post, ErrorKind, Result, Storage, StorageError, Settings};
 use std::fs::{File, OpenOptions};
 use std::io::{ErrorKind as IOErrorKind, Seek, SeekFrom, Read, Write};
 use std::time::Duration;
@@ -387,6 +387,10 @@ impl Storage for FileStorage {
                         {
                             symlink_result = std::os::windows::fs::symlink_file(relative, link);
                         }
+                        #[cfg(all(not(unix), not(windows)))]
+                        {
+                            compile_error!("Don't know how to create symlinks on non-unix non-windows platform");
+                        }
                         if let Err(e) = symlink_result {
                             Err(e.into())
                         } else {
@@ -596,7 +600,7 @@ impl Storage for FileStorage {
         }
     }
 
-    async fn get_setting(&self, setting: &'_ str, user: &'_ str) -> Result<String> {
+    async fn get_setting(&self, setting: Settings, user: &'_ str) -> Result<String> {
         log::debug!("User for getting settings: {}", user);
         let url = warp::http::Uri::try_from(user).expect("Couldn't parse a URL");
         let mut path = relative_path::RelativePathBuf::new();
@@ -626,7 +630,7 @@ impl Storage for FileStorage {
         )).await?.unwrap()
     }
 
-    async fn set_setting(&self, setting: &'_ str, user: &'_ str, value: &'_ str) -> Result<()> {
+    async fn set_setting(&self, setting: Settings, user: &'_ str, value: &'_ str) -> Result<()> {
         let url = warp::http::Uri::try_from(user).expect("Couldn't parse a URL");
         let mut path = relative_path::RelativePathBuf::new();
         path.push(url.authority().unwrap().to_string());
diff --git a/src/database/memory.rs b/src/database/memory.rs
index df142d3..5e2ad52 100644
--- a/src/database/memory.rs
+++ b/src/database/memory.rs
@@ -6,7 +6,7 @@ use tokio::sync::RwLock;
 use futures_util::FutureExt;
 use serde_json::json;
 
-use crate::database::{Storage, Result, StorageError, ErrorKind, MicropubChannel};
+use crate::database::{Storage, Result, StorageError, ErrorKind, MicropubChannel, Settings};
 
 #[derive(Clone, Debug)]
 pub struct MemoryStorage {
@@ -177,12 +177,12 @@ impl Storage for MemoryStorage {
     }
 
     #[allow(unused_variables)]
-    async fn get_setting(&self, setting: &'_ str, user: &'_ str) -> Result<String> {
+    async fn get_setting(&self, setting: Settings, user: &'_ str) -> Result<String> {
         todo!()
     }
 
     #[allow(unused_variables)]
-    async fn set_setting(&self, setting: &'_ str, user: &'_ str, value: &'_ str) -> Result<()> {
+    async fn set_setting(&self, setting: Settings, user: &'_ str, value: &'_ str) -> Result<()> {
         todo!()
     }
 }
diff --git a/src/database/mod.rs b/src/database/mod.rs
index e7baaa8..57223f8 100644
--- a/src/database/mod.rs
+++ b/src/database/mod.rs
@@ -39,6 +39,20 @@ pub enum ErrorKind {
     Other,
 }
 
+/// Enum representing settings that might be stored in the site's database.
+#[derive(Serialize, Debug, Clone, Copy)]
+#[serde(rename_all = "snake_case")]
+pub enum Settings {
+    /// The name of the website -- displayed in the header and the browser titlebar.
+    SiteName,
+}
+
+impl std::string::ToString for Settings {
+    fn to_string(&self) -> String {
+        serde_variant::to_variant_name(self).unwrap().to_string()
+    }
+}
+
 /// Error signalled from the database.
 #[derive(Debug)]
 pub struct StorageError {
@@ -239,10 +253,10 @@ pub trait Storage: std::fmt::Debug + Clone + Send + Sync {
     async fn delete_post(&self, url: &'_ str) -> Result<()>;
 
     /// Gets a setting from the setting store and passes the result.
-    async fn get_setting(&self, setting: &'_ str, user: &'_ str) -> Result<String>;
+    async fn get_setting(&self, setting: Settings, user: &'_ str) -> Result<String>;
 
     /// Commits a setting to the setting store.
-    async fn set_setting(&self, setting: &'_ str, user: &'_ str, value: &'_ str) -> Result<()>;
+    async fn set_setting(&self, setting: Settings, user: &'_ str, value: &'_ str) -> Result<()>;
 }
 
 #[cfg(test)]
@@ -399,12 +413,12 @@ mod tests {
 
     async fn test_backend_settings<Backend: Storage>(backend: Backend) {
         backend
-            .set_setting("site_name", "https://fireburn.ru/", "Vika's Hideout")
+            .set_setting(crate::database::Settings::SiteName, "https://fireburn.ru/", "Vika's Hideout")
             .await
             .unwrap();
         assert_eq!(
             backend
-                .get_setting("site_name", "https://fireburn.ru/")
+                .get_setting(crate::database::Settings::SiteName, "https://fireburn.ru/")
                 .await
                 .unwrap(),
             "Vika's Hideout"