feat(messaging): implement fetch and send

src/routes/channels/message_fetch.rs

@@ -1,11 +1,23 @@
-use revolt_quark::Result;
+use revolt_quark::{models::{User, Message}, perms, Db, Error, Ref, Result};
 
-use rocket::serde::json::Value;
+use rocket::serde::json::Json;
 
 #[get("/<target>/messages/<msg>")]
-pub async fn req(
-    /*user: UserRef, target: Ref, msg: Ref*/ target: String,
-    msg: String,
-) -> Result<Value> {
-    todo!()
+pub async fn req(db: &Db, user: User, target: Ref, msg: Ref) -> Result<Json<Message>> {
+    let channel = target.as_channel(db).await?;
+    if !perms(&user)
+        .channel(&channel)
+        .calc_channel(db)
+        .await
+        .get_view()
+    {
+        return Err(Error::NotFound);
+    }
+
+    let message = msg.as_message(db).await?;
+    if message.channel != channel.as_id() {
+        return Err(Error::NotFound);
+    }
+
+    Ok(Json(message))
 }