Initial backend repository commit.

Set up project files and add .gitignore to exclude local build/runtime artifacts.

Made-with: Cursor

internal/service/post_ai_service.go

@@ -0,0 +1,103 @@
+package service
+
+import (
+	"context"
+	"log"
+	"strings"
+
+	"carrot_bbs/internal/pkg/openai"
+)
+
+// PostModerationRejectedError 帖子审核拒绝错误
+type PostModerationRejectedError struct {
+	Reason string
+}
+
+func (e *PostModerationRejectedError) Error() string {
+	if strings.TrimSpace(e.Reason) == "" {
+		return "post rejected by moderation"
+	}
+	return "post rejected by moderation: " + e.Reason
+}
+
+// UserMessage 返回给前端的用户可读文案
+func (e *PostModerationRejectedError) UserMessage() string {
+	if strings.TrimSpace(e.Reason) == "" {
+		return "内容未通过审核，请修改后重试"
+	}
+	return strings.TrimSpace(e.Reason)
+}
+
+// CommentModerationRejectedError 评论审核拒绝错误
+type CommentModerationRejectedError struct {
+	Reason string
+}
+
+func (e *CommentModerationRejectedError) Error() string {
+	if strings.TrimSpace(e.Reason) == "" {
+		return "comment rejected by moderation"
+	}
+	return "comment rejected by moderation: " + e.Reason
+}
+
+// UserMessage 返回给前端的用户可读文案
+func (e *CommentModerationRejectedError) UserMessage() string {
+	if strings.TrimSpace(e.Reason) == "" {
+		return "评论未通过审核，请修改后重试"
+	}
+	return strings.TrimSpace(e.Reason)
+}
+
+type PostAIService struct {
+	openAIClient openai.Client
+}
+
+func NewPostAIService(openAIClient openai.Client) *PostAIService {
+	return &PostAIService{
+		openAIClient: openAIClient,
+	}
+}
+
+func (s *PostAIService) IsEnabled() bool {
+	return s != nil && s.openAIClient != nil && s.openAIClient.IsEnabled()
+}
+
+// ModeratePost 审核帖子内容，返回 nil 表示通过
+func (s *PostAIService) ModeratePost(ctx context.Context, title, content string, images []string) error {
+	if !s.IsEnabled() {
+		return nil
+	}
+
+	approved, reason, err := s.openAIClient.ModeratePost(ctx, title, content, images)
+	if err != nil {
+		if s.openAIClient.Config().StrictModeration {
+			return err
+		}
+		log.Printf("[WARN] AI moderation failed, fallback allow: %v", err)
+		return nil
+	}
+	if !approved {
+		return &PostModerationRejectedError{Reason: reason}
+	}
+	return nil
+}
+
+// ModerateComment 审核评论内容，返回 nil 表示通过
+func (s *PostAIService) ModerateComment(ctx context.Context, content string, images []string) error {
+	if !s.IsEnabled() {
+		return nil
+	}
+
+	approved, reason, err := s.openAIClient.ModerateComment(ctx, content, images)
+	if err != nil {
+		if s.openAIClient.Config().StrictModeration {
+			return err
+		}
+		log.Printf("[WARN] AI comment moderation failed, fallback allow: %v", err)
+		return nil
+	}
+	if !approved {
+		return &CommentModerationRejectedError{Reason: reason}
+	}
+	return nil
+}