add dynamic profile update, connection helper, file download metadata

- replace UserSetColor/UserSetPronouns with single UserUpdateProfile that dynamically builds one UPDATE query from UserProfileUpdateList
- add getConnectionWithResponseOnFail helper to deduplicate connection ID parsing and validation across handlers
- rename file.go to attachmentFile.go and update handler names
- GetDownloadUrlAndMetadata now fetches object metadata via StatObject and returns it alongside the presigned URL
- file download endpoint returns JSON with url and originalName
- add description field to user and DB schema
- remove unused ConnectionState variants (GroupFellow, GroupFriend)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/httpRequest/connectionsAndDms.go

@@ -32,14 +32,8 @@ func HandleDm(response http.ResponseWriter, request *http.Request) {
 		return
 	}
 
-	targetConnection, err := convertions.ConvertStringUuid(request.FormValue("connectionid"))
-	if err != nil {
-		http.Error(response, "invalid connectionid", http.StatusBadRequest)
-		return
-	}
-	conn, ok := cache.CacheGetConnection(user, targetConnection)
+	conn, ok := getConnectionWithResponseOnFail(&response, request, user)
 	if !ok {
-		http.Error(response, "invalid connectionid", http.StatusBadRequest)
 		return
 	}
 
@@ -51,7 +45,7 @@ func HandleDm(response http.ResponseWriter, request *http.Request) {
 		return
 	}
 
-	if attachedFile != "" && !strings.HasPrefix(attachedFile, targetConnection.String()+"/") {
+	if attachedFile != "" && !strings.HasPrefix(attachedFile, conn.Id.String()+"/") {
 		http.Error(response, "invalid attachedFile", http.StatusBadRequest)
 		return
 	}
@@ -105,9 +99,8 @@ func HandleUserGetConnectionMessages(response http.ResponseWriter, request *http
 		return
 	}
 
-	connectionId, err := convertions.ConvertStringUuid(request.FormValue("connectionid"))
-	if err != nil {
-		http.Error(response, "invalid connectionid", http.StatusBadRequest)
+	conn, ok := getConnectionWithResponseOnFail(&response, request, user)
+	if !ok {
 		return
 	}
 
@@ -121,12 +114,6 @@ func HandleUserGetConnectionMessages(response http.ResponseWriter, request *http
 		messagesCap = globals.MaxDirectMsgCache
 	}
 
-	conn, ok := cache.CacheGetConnection(user, connectionId)
-	if !ok {
-		http.Error(response, "invalid connectionid", http.StatusBadRequest)
-		return
-	}
-
 	buffer, bufferSize := conn.GetSortedMessagesBuff()
 
 	var validBufCount uint32
@@ -148,7 +135,7 @@ func HandleUserGetConnectionMessages(response http.ResponseWriter, request *http
 		if validBufCount > 0 {
 			cutoff = buffer[0].CreatedAt
 		}
-		dbMessages, err := postgresql.ConnectionGetMessagesBefore(ctx, cutoff, connectionId, remaining)
+		dbMessages, err := postgresql.ConnectionGetMessagesBefore(ctx, cutoff, conn.Id, remaining)
 		if err != nil {
 			http.Error(response, "internal server error", http.StatusInternalServerError)
 			return
@@ -241,15 +228,8 @@ func HandleUserDeleteConnection(response http.ResponseWriter, request *http.Requ
 		return
 	}
 
-	connectionId, err := convertions.ConvertStringUuid(request.FormValue("connectionid"))
-	if err != nil {
-		http.Error(response, "invalid connectionid", http.StatusBadRequest)
-		return
-	}
-
-	conn, ok := cache.CacheGetConnection(user, connectionId)
+	conn, ok := getConnectionWithResponseOnFail(&response, request, user)
 	if !ok {
-		http.Error(response, "invalid connectionid", http.StatusBadRequest)
 		return
 	}
 
@@ -279,10 +259,10 @@ func HandleUserDeleteConnection(response http.ResponseWriter, request *http.Requ
 		return
 	}
 
-	cache.CacheDeleteConnection(user, user2, connectionId)
+	cache.CacheDeleteConnection(user, user2, conn.Id)
 	wsServer.WsSendMessageCloseIfTimeout(user2, types.WsEventMessage{
 		Type:  WsEventType.ConnectionDeleted,
-		Event: connectionId,
+		Event: conn.Id,
 	})
 
 	response.WriteHeader(http.StatusAccepted)
@@ -298,14 +278,8 @@ func HandleUserElevateConnection(response http.ResponseWriter, request *http.Req
 		http.Error(response, "invalid token", http.StatusUnauthorized)
 		return
 	}
-	connectionId, err := convertions.ConvertStringUuid(request.FormValue("connectionid"))
-	if err != nil {
-		http.Error(response, "invalid connectionid", http.StatusBadRequest)
-		return
-	}
-	conn, ok := cache.CacheGetConnection(user, connectionId)
+	conn, ok := getConnectionWithResponseOnFail(&response, request, user)
 	if !ok {
-		http.Error(response, "invalid connectionid", http.StatusBadRequest)
 		return
 	}
 
@@ -316,9 +290,6 @@ func HandleUserElevateConnection(response http.ResponseWriter, request *http.Req
 		case ConnectionState.Stranger:
 			conn.State = ConnectionState.Friend
 			break
-		case ConnectionState.GroupFellow:
-			conn.State = ConnectionState.Stranger
-			break
 		default:
 			http.Error(response, "cannot elevate further", http.StatusBadRequest)
 			return
@@ -345,7 +316,7 @@ func HandleUserElevateConnection(response http.ResponseWriter, request *http.Req
 		wsServer.WsSendMessageCloseIfTimeout(user2, types.WsEventMessage{
 			Type: WsEventType.ConnectionElevated,
 			Event: types.ConnectionElevationData{
-				Id:       connectionId,
+				Id:       conn.Id,
 				NewState: conn.State,
 			},
 		})