28a45caad3
- Added UploadService to handle image uploads and validation for chat messages. - Updated ChatService and MessageService to utilize UploadService for validating image segments in messages. - Enhanced wire generation to inject UploadService into relevant services. - Introduced UploadImageBytes method in UploadService for uploading images directly from memory. - Added TrustedPublicURLPrefix method in S3 Client for generating public URLs for uploaded images.
67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
package service
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import (
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"fmt"
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"net/url"
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"strings"
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"carrot_bbs/internal/model"
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)
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// ValidateChatMessageImageSegments 校验聊天消息中的图片段：禁止 data:/base64 内联，仅允许引用本站 S3 公开前缀下的 URL。
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func (s *UploadService) ValidateChatMessageImageSegments(segments model.MessageSegments) error {
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if s == nil || s.s3Client == nil {
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return nil
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}
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prefix := strings.TrimSpace(s.s3Client.TrustedPublicURLPrefix())
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if prefix == "" {
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return nil
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}
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for _, seg := range segments {
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if seg.Type != string(model.ContentTypeImage) && seg.Type != "image" {
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continue
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}
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if seg.Data == nil {
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return fmt.Errorf("图片消息数据无效")
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}
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urlStr, _ := seg.Data["url"].(string)
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urlStr = strings.TrimSpace(urlStr)
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if urlStr == "" {
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return fmt.Errorf("图片消息缺少 url")
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}
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low := strings.ToLower(urlStr)
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if strings.HasPrefix(low, "data:") || strings.HasPrefix(low, "base64:") || strings.HasPrefix(low, "base64://") {
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return fmt.Errorf("禁止在消息中内联 base64 或 data URL，请先通过上传接口获取图片地址")
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}
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if strings.ContainsAny(urlStr, "\n\r\x00") {
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return fmt.Errorf("非法图片地址")
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}
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u, err := url.Parse(urlStr)
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if err != nil || (u.Scheme != "http" && u.Scheme != "https") {
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return fmt.Errorf("图片地址必须为 http(s) 链接")
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}
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if u.Host == "" {
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return fmt.Errorf("图片地址无效")
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}
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if !strings.HasPrefix(urlStr, prefix) {
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return fmt.Errorf("图片必须使用本站上传接口生成的资源地址")
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}
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if thumb, ok := seg.Data["thumbnail_url"].(string); ok {
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thumb = strings.TrimSpace(thumb)
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if thumb != "" {
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if strings.HasPrefix(strings.ToLower(thumb), "data:") {
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return fmt.Errorf("禁止在图片消息中使用 data URL 缩略图")
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}
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if !strings.HasPrefix(thumb, prefix) {
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return fmt.Errorf("缩略图地址不合法")
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}
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}
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}
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}
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return nil
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}
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