| 1 | package bot |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "io" |
| 7 | "mime" |
| 8 | "net/http" |
| 9 | "net/url" |
| 10 | "path" |
| 11 | "strings" |
| 12 | "time" |
| 13 | |
| 14 | "reasonix/internal/control" |
| 15 | ) |
| 16 | |
| 17 | const maxBotMediaBytes = 25 * 1024 * 1024 |
| 18 | |
| 19 | var botMediaHTTPClient = &http.Client{Timeout: 30 * time.Second} |
| 20 | |
| 21 | func saveInboundMedia(ctx context.Context, workspaceRoot string, mediaURLs []string) (refs []string, errs []error) { |
| 22 | for _, rawURL := range mediaURLs { |
| 23 | ref, err := saveOneInboundMedia(ctx, workspaceRoot, rawURL) |
| 24 | if err != nil { |
| 25 | errs = append(errs, err) |
| 26 | continue |
| 27 | } |
| 28 | refs = append(refs, ref) |
| 29 | } |
| 30 | return refs, errs |
| 31 | } |
| 32 | |
| 33 | func saveOneInboundMedia(ctx context.Context, workspaceRoot, rawURL string) (string, error) { |
| 34 | rawURL = strings.TrimSpace(rawURL) |
| 35 | if rawURL == "" { |
| 36 | return "", fmt.Errorf("empty media URL") |
| 37 | } |
| 38 | u, err := url.Parse(rawURL) |
| 39 | if err != nil { |
| 40 | return "", err |
| 41 | } |
| 42 | if u.Scheme != "http" && u.Scheme != "https" { |
| 43 | return "", fmt.Errorf("unsupported media URL scheme %q", u.Scheme) |
| 44 | } |
| 45 | req, err := http.NewRequestWithContext(ctx, http.MethodGet, rawURL, nil) |
| 46 | if err != nil { |
| 47 | return "", err |
| 48 | } |
| 49 | resp, err := botMediaHTTPClient.Do(req) |
| 50 | if err != nil { |
| 51 | return "", err |
| 52 | } |
| 53 | defer resp.Body.Close() |
| 54 | if resp.StatusCode < 200 || resp.StatusCode >= 300 { |
| 55 | return "", fmt.Errorf("download media: HTTP %d", resp.StatusCode) |
| 56 | } |
| 57 | raw, err := io.ReadAll(io.LimitReader(resp.Body, maxBotMediaBytes+1)) |
| 58 | if err != nil { |
| 59 | return "", err |
| 60 | } |
| 61 | if len(raw) == 0 || len(raw) > maxBotMediaBytes { |
| 62 | return "", fmt.Errorf("media must be between 1 byte and 25 MB") |
| 63 | } |
| 64 | contentType := resp.Header.Get("Content-Type") |
| 65 | if semi := strings.Index(contentType, ";"); semi >= 0 { |
| 66 | contentType = strings.TrimSpace(contentType[:semi]) |
| 67 | } |
| 68 | if strings.TrimSpace(contentType) == "" || strings.EqualFold(contentType, "application/octet-stream") { |
| 69 | contentType = http.DetectContentType(raw[:min(len(raw), 512)]) |
| 70 | } |
| 71 | name := mediaFilename(u, contentType) |
| 72 | if strings.HasPrefix(strings.ToLower(contentType), "image/") { |
| 73 | return control.SaveImageBytesInRoot(workspaceRoot, contentType, raw) |
| 74 | } |
| 75 | return control.SaveAttachmentBytesInRoot(workspaceRoot, name, raw) |
| 76 | } |
| 77 | |
| 78 | func saveInboundMediaItems(ctx context.Context, workspaceRoot string, items []InboundMedia) (refs, fallbacks []string, errs []error) { |
| 79 | for _, item := range items { |
| 80 | ref, err := saveOneInboundMediaItem(ctx, workspaceRoot, item) |
| 81 | if err != nil { |
| 82 | errs = append(errs, err) |
| 83 | if fallback := strings.TrimSpace(item.FailureText); fallback != "" { |
| 84 | fallbacks = append(fallbacks, fallback) |
| 85 | } |
| 86 | continue |
| 87 | } |
| 88 | refs = append(refs, ref) |
| 89 | } |
| 90 | return refs, fallbacks, errs |
| 91 | } |
| 92 | |
| 93 | func saveOneInboundMediaItem(ctx context.Context, workspaceRoot string, item InboundMedia) (string, error) { |
| 94 | if item.Load != nil { |
| 95 | data, name, err := item.Load(ctx) |
| 96 | if err != nil { |
| 97 | return "", err |
| 98 | } |
| 99 | item.Data = data |
| 100 | if strings.TrimSpace(item.Name) == "" { |
| 101 | item.Name = name |
| 102 | } |
| 103 | } |
| 104 | if len(item.Data) == 0 || len(item.Data) > maxBotMediaBytes { |
| 105 | return "", fmt.Errorf("media must be between 1 byte and 25 MB") |
| 106 | } |
| 107 | contentType := strings.TrimSpace(item.MIME) |
| 108 | if contentType == "" || strings.EqualFold(contentType, "application/octet-stream") { |
| 109 | contentType = http.DetectContentType(item.Data[:min(len(item.Data), 512)]) |
| 110 | } |
| 111 | if strings.HasPrefix(strings.ToLower(contentType), "image/") { |
| 112 | if ref, err := control.SaveImageBytesInRoot(workspaceRoot, contentType, item.Data); err == nil { |
| 113 | return ref, nil |
| 114 | } |
| 115 | // 图片超过 10MB 上限或签名不被识别时，降级存为普通附件而不是丢弃。 |
| 116 | } |
| 117 | name := strings.TrimSpace(item.Name) |
| 118 | if name == "" { |
| 119 | if exts, err := mime.ExtensionsByType(contentType); err == nil && len(exts) > 0 { |
| 120 | name = "media" + exts[0] |
| 121 | } else { |
| 122 | name = "media.bin" |
| 123 | } |
| 124 | } |
| 125 | return control.SaveAttachmentBytesInRoot(workspaceRoot, name, item.Data) |
| 126 | } |
| 127 | |
| 128 | func appendMediaFallbacks(text string, fallbacks []string) string { |
| 129 | for _, fallback := range fallbacks { |
| 130 | fallback = strings.TrimSpace(fallback) |
| 131 | if fallback == "" { |
| 132 | continue |
| 133 | } |
| 134 | if strings.TrimSpace(text) != "" { |
| 135 | text += "\n" |
| 136 | } |
| 137 | text += fallback |
| 138 | } |
| 139 | return text |
| 140 | } |
| 141 | |
| 142 | func mediaFilename(u *url.URL, contentType string) string { |
| 143 | base := path.Base(u.Path) |
| 144 | if base == "." || base == "/" || strings.TrimSpace(base) == "" { |
| 145 | if exts, err := mime.ExtensionsByType(contentType); err == nil && len(exts) > 0 { |
| 146 | return "media" + exts[0] |
| 147 | } |
| 148 | return "media.bin" |
| 149 | } |
| 150 | return base |
| 151 | } |
| 152 | |
| 153 | func appendMediaRefs(text string, refs []string) string { |
| 154 | if len(refs) == 0 { |
| 155 | return text |
| 156 | } |
| 157 | var b strings.Builder |
| 158 | if strings.TrimSpace(text) != "" { |
| 159 | b.WriteString(text) |
| 160 | b.WriteString("\n\n") |
| 161 | } |
| 162 | b.WriteString("Attachments:") |
| 163 | for _, ref := range refs { |
| 164 | b.WriteString("\n@") |
| 165 | b.WriteString(ref) |
| 166 | } |
| 167 | return b.String() |
| 168 | } |
| 169 |