| 1 | package provider |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "net/url" |
| 6 | "strings" |
| 7 | "unicode/utf8" |
| 8 | |
| 9 | "reasonix/internal/attachment" |
| 10 | ) |
| 11 | |
| 12 | const ( |
| 13 | // MaxInlineImageBytes is the official DeepSeek base64 / URL image cap (32 MiB). |
| 14 | MaxInlineImageBytes = 32 << 20 |
| 15 | // MaxFileAPIImageBytes is the official DeepSeek Files API image cap (64 MiB). |
| 16 | MaxFileAPIImageBytes = 64 << 20 |
| 17 | // MaxImageURLRunes is the official DeepSeek external image URL length cap. |
| 18 | MaxImageURLRunes = 8192 |
| 19 | ) |
| 20 | |
| 21 | // ImageKind classifies a Message.Images entry for vision serializers. |
| 22 | type ImageKind int |
| 23 | |
| 24 | const ( |
| 25 | ImageNone ImageKind = iota |
| 26 | ImageDataURL |
| 27 | ImageHTTPURL |
| 28 | ImageFileID |
| 29 | ) |
| 30 | |
| 31 | // ClassifyImage reports how a stored image reference should appear on the wire. |
| 32 | // Older sessions only stored data URLs; HTTP URLs and Files API ids are additive. |
| 33 | func ClassifyImage(s string) ImageKind { |
| 34 | s = strings.TrimSpace(s) |
| 35 | if s == "" { |
| 36 | return ImageNone |
| 37 | } |
| 38 | if _, _, ok := ParseImageDataURL(s); ok { |
| 39 | return ImageDataURL |
| 40 | } |
| 41 | if IsImageFileID(s) { |
| 42 | return ImageFileID |
| 43 | } |
| 44 | if IsImageHTTPURL(s) { |
| 45 | return ImageHTTPURL |
| 46 | } |
| 47 | return ImageNone |
| 48 | } |
| 49 | |
| 50 | // IsImageFileID reports a DeepSeek Files API id (file-api-…). |
| 51 | func IsImageFileID(s string) bool { |
| 52 | s = strings.TrimSpace(s) |
| 53 | rest, ok := strings.CutPrefix(s, "file-api-") |
| 54 | if !ok || rest == "" || len(rest) > 128 { |
| 55 | return false |
| 56 | } |
| 57 | for _, r := range rest { |
| 58 | if r >= 'a' && r <= 'z' || r >= 'A' && r <= 'Z' || r >= '0' && r <= '9' || r == '_' || r == '-' { |
| 59 | continue |
| 60 | } |
| 61 | return false |
| 62 | } |
| 63 | return true |
| 64 | } |
| 65 | |
| 66 | // IsImageHTTPURL reports a public http(s) image URL that official DeepSeek |
| 67 | // can fetch (extension-gated so arbitrary links are not treated as images). |
| 68 | func IsImageHTTPURL(s string) bool { |
| 69 | s = strings.TrimSpace(s) |
| 70 | if s == "" || utf8.RuneCountInString(s) > MaxImageURLRunes { |
| 71 | return false |
| 72 | } |
| 73 | u, err := url.Parse(s) |
| 74 | if err != nil || u.User != nil || u.Host == "" { |
| 75 | return false |
| 76 | } |
| 77 | switch strings.ToLower(u.Scheme) { |
| 78 | case "http", "https": |
| 79 | default: |
| 80 | return false |
| 81 | } |
| 82 | path := u.EscapedPath() |
| 83 | if i := strings.LastIndex(path, "."); i >= 0 { |
| 84 | path = path[i:] |
| 85 | } else { |
| 86 | return false |
| 87 | } |
| 88 | switch strings.ToLower(path) { |
| 89 | case ".jpg", ".jpeg", ".png", ".gif", ".webp": |
| 90 | return true |
| 91 | default: |
| 92 | return false |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | func (m Message) HasImagePayload() bool { |
| 97 | return len(m.Images) > 0 || len(m.ImageInputs) > 0 |
| 98 | } |
| 99 | |
| 100 | func (m Message) ValidateImageFields() error { |
| 101 | if len(m.Images) > 0 && len(m.ImageInputs) > 0 { |
| 102 | return errors.New("message must not combine images and image_inputs") |
| 103 | } |
| 104 | for _, in := range m.ImageInputs { |
| 105 | if err := in.Validate(); err != nil { |
| 106 | return err |
| 107 | } |
| 108 | } |
| 109 | return nil |
| 110 | } |
| 111 | |
| 112 | func CloneImageInputs(in []attachment.ImageInput) []attachment.ImageInput { |
| 113 | return attachment.CloneImageInputs(in) |
| 114 | } |
| 115 |