refactor(application): strip comments, DRY ownership check + parse_content_type

crates/application/src/channels/update.rs

@@ -1,38 +1,26 @@
 use domain::events::DomainEvent;
 use domain::models::Channel;
 use domain::value_objects::{ChannelId, UserId};
-use domain::{DomainError, DomainResult};
+use domain::DomainResult;
 
 use super::commands::UpdateChannelCommand;
 use super::deps::ChannelCommandDeps;
+use super::find_owned_channel;
 
-/// Update an existing channel.
-///
-/// Flow: find channel -> verify ownership -> snapshot config if changed ->
-/// apply updates -> save -> publish event -> return.
 pub async fn execute(deps: &ChannelCommandDeps, cmd: UpdateChannelCommand) -> DomainResult<Channel> {
     let channel_id = ChannelId::from(cmd.channel_id);
     let owner_id = UserId::from(cmd.owner_id);
 
-    let mut channel = deps
-        .channel_query
-        .find_by_id(channel_id)
-        .await?
-        .ok_or(DomainError::ChannelNotFound(cmd.channel_id))?;
+    let mut channel =
+        find_owned_channel(deps.channel_query.as_ref(), channel_id, owner_id, cmd.channel_id)
+            .await?;
 
-    // Ownership check
-    if channel.owner_id() != owner_id {
-        return Err(DomainError::forbidden("You don't own this channel"));
-    }
-
-    // Auto-snapshot the current config before overwriting
     if cmd.schedule_config.is_some() {
         deps.channel_command
             .save_config_snapshot(channel_id, channel.schedule_config(), None)
             .await?;
     }
 
-    // Apply partial updates
     if let Some(name) = cmd.name {
         channel.set_name(name);
     }