fix early return when fetching artwork comments

core/artwork.go

@@ -316,22 +316,6 @@ func GetArtworkByID(r *http.Request, id string, full bool) (*Illust, error) {
 			}
 			illust2.RelatedWorks = related
 		}()
-
-		// Get reader comments
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-
-			// if illust.CommentDisabled == 1 {
-			// 	return
-			// }
-			comments, err := GetArtworkComments(r, id)
-			if err != nil {
-				cerr <- err
-				return
-			}
-			illust2.CommentsList = comments
-		}()
 	}
 
 	// Get basic illust information
@@ -433,6 +417,27 @@ func GetArtworkByID(r *http.Request, id string, full bool) (*Illust, error) {
 				illust.RecentWorks = recent
 			}()
 		}
+
+		// Get reader comments
+		//
+		// Only fetch the comments if 'full' is requested and comments are not disabled (illust.CommentDisabled != 1).
+		// This check needs to happen *after* fetching the basic artwork information, since that's when
+		// 'CommentDisabled' is populated. If we check it too early, it would default to 0 (enabled),
+		// leading to an invalid API call to fetch comments even when they are disabled, causing an HTTP 500 error
+		// on our end when we receive HTTP 400 from the Pixiv API as a result.
+		if full && illust.CommentDisabled != 1 {
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+
+				comments, err := GetArtworkComments(r, id)
+				if err != nil {
+					cerr <- err
+					return
+				}
+				illust2.CommentsList = comments
+			}()
+		}
 	}()
 
 	wg.Wait()