Strict typing for system messages; add a way to rename group.

src/routes/channels/edit_channel.rs

@@ -0,0 +1,71 @@
+use crate::database::*;
+use crate::util::result::{Error, Result};
+use crate::notifications::events::ClientboundNotification;
+
+use validator::Validate;
+use rocket_contrib::json::Json;
+use serde::{Serialize, Deserialize};
+use mongodb::bson::{doc, to_document};
+
+#[derive(Validate, Serialize, Deserialize)]
+pub struct Data {
+    #[validate(length(min = 1, max = 32))]
+    name: Option<String>,
+    #[validate(length(min = 0, max = 1024))]
+    description: Option<String>,
+}
+
+#[patch("/<target>", data = "<info>")]
+pub async fn req(user: User, target: Ref, info: Json<Data>) -> Result<()> {
+    info.validate()
+        .map_err(|error| Error::FailedValidation { error })?;
+    
+    if info.name.is_none() && info.description.is_none() {
+        return Ok(())
+    }
+
+    let target = target.fetch_channel().await?;
+    let perm = permissions::PermissionCalculator::new(&user)
+        .with_channel(&target)
+        .for_channel()
+        .await?;
+    
+    if !perm.get_manage_channel() {
+        Err(Error::MissingPermission)?
+    }
+
+    match &target {
+        Channel::Group { id, .. } => {
+            let col = get_collection("channels");
+            col.update_one(
+                doc! { "_id": &id },
+                doc! { "$set": to_document(&info.0).map_err(|_| Error::DatabaseError { operation: "to_document", with: "info" })? },
+                None
+            )
+            .await
+            .map_err(|_| Error::DatabaseError { operation: "update_one", with: "channel" })?;
+
+            ClientboundNotification::ChannelUpdate {
+                id: id.clone(),
+                data: json!(info.0)
+            }
+            .publish(id.clone())
+            .await
+            .ok();
+
+            if let Some(name) = &info.name {
+                Message::create(
+                    "00000000000000000000000000".to_string(),
+                    id.clone(),
+                    Content::SystemMessage(SystemMessage::ChannelRenamed { name: name.clone(), by: user.id })
+                )
+                .publish(&target)
+                .await
+                .ok();
+            }
+
+            Ok(())
+        }
+        _ => Err(Error::InvalidOperation)
+    }
+}