fix: move required custom field validation before issue creation

Validation now runs before NewIssue() to prevent orphaned issues
when a required field is missing. Reuses the defs query for both
validation and saving.

routers/api/v1/repo/issue.go

@@ -722,6 +722,22 @@ func CreateIssue(ctx *context.APIContext) {
 		form.Labels = make([]int64, 0)
 	}
 
+	// Validate required custom fields BEFORE creating the issue to avoid
+	// leaving orphaned issues when validation fails.
+	customFieldDefs, defErr := issues_model.GetCustomFieldsByOwner(ctx, ctx.Repo.Repository.OwnerID, issues_model.CustomFieldScopeIssue)
+	if defErr != nil {
+		ctx.APIErrorInternal(defErr)
+		return
+	}
+	for _, def := range customFieldDefs {
+		if def.Required {
+			if v, ok := form.CustomFields[def.Name]; !ok || strings.TrimSpace(v) == "" {
+				ctx.APIError(http.StatusUnprocessableEntity, fmt.Errorf("custom field %q is required", def.Name))
+				return
+			}
+		}
+	}
+
 	if err := issue_service.NewIssue(ctx, ctx.Repo.Repository, issue, form.Labels, nil, assigneeIDs, form.Projects); err != nil {
 		if errors.Is(err, user_model.ErrBlockedUser) {
 			ctx.APIError(http.StatusForbidden, err)
@@ -733,35 +749,18 @@ func CreateIssue(ctx *context.APIContext) {
 		return
 	}
 
-	// Save custom field values if provided (resolve field names to IDs).
-	// Validate required fields are present.
-	{
-		defs, defErr := issues_model.GetCustomFieldsByOwner(ctx, ctx.Repo.Repository.OwnerID, issues_model.CustomFieldScopeIssue)
-		if defErr != nil {
-			ctx.APIErrorInternal(defErr)
-			return
+	// Save custom field values (reuse defs from validation above).
+	if len(customFieldDefs) > 0 && len(form.CustomFields) > 0 {
+		vals := make(map[int64]string)
+		for _, def := range customFieldDefs {
+			if v, ok := form.CustomFields[def.Name]; ok {
+				vals[def.ID] = v
+			}
 		}
-		if len(defs) > 0 {
-			// Check required fields.
-			for _, def := range defs {
-				if def.Required {
-					if v, ok := form.CustomFields[def.Name]; !ok || strings.TrimSpace(v) == "" {
-						ctx.APIError(http.StatusUnprocessableEntity, fmt.Errorf("custom field %q is required", def.Name))
-						return
-					}
-				}
-			}
-			vals := make(map[int64]string)
-			for _, def := range defs {
-				if v, ok := form.CustomFields[def.Name]; ok {
-					vals[def.ID] = v
-				}
-			}
-			if len(vals) > 0 {
-				if setErr := issues_model.SetCustomFieldValues(ctx, issue.ID, vals); setErr != nil {
-					ctx.APIErrorInternal(setErr)
-					return
-				}
+		if len(vals) > 0 {
+			if setErr := issues_model.SetCustomFieldValues(ctx, issue.ID, vals); setErr != nil {
+				ctx.APIErrorInternal(setErr)
+				return
 			}
 		}
 	}