| 1 | package imageinput |
| 2 | |
| 3 | import ( |
| 4 | "crypto/sha256" |
| 5 | "encoding/base64" |
| 6 | "encoding/hex" |
| 7 | "fmt" |
| 8 | "strings" |
| 9 | "unicode/utf8" |
| 10 | |
| 11 | "reasonix/internal/provider" |
| 12 | ) |
| 13 | |
| 14 | func ImageDigest(ref string) string { |
| 15 | ref = strings.TrimSpace(ref) |
| 16 | if media, payload, ok := provider.ParseImageDataURL(ref); ok { |
| 17 | if raw, err := base64.StdEncoding.DecodeString(payload); err == nil { |
| 18 | h := sha256.New() |
| 19 | h.Write([]byte(media)) |
| 20 | h.Write(raw) |
| 21 | return hex.EncodeToString(h.Sum(nil)) |
| 22 | } |
| 23 | } |
| 24 | sum := sha256.Sum256([]byte(ref)) |
| 25 | return hex.EncodeToString(sum[:]) |
| 26 | } |
| 27 | |
| 28 | func visionSummaryContext(summary *provider.VisionSummary) string { |
| 29 | if summary == nil || strings.TrimSpace(summary.Summary) == "" { |
| 30 | return "" |
| 31 | } |
| 32 | return fmt.Sprintf("<reasonix-image-context version=\"%d\" untrusted=\"true\">\n%s\n</reasonix-image-context>", summary.Version, "Image understanding summary from "+summary.ModelRef+":\n"+strings.TrimSpace(summary.Summary)) |
| 33 | } |
| 34 | |
| 35 | func AppendSummary(input string, summary *provider.VisionSummary) string { |
| 36 | block := visionSummaryContext(summary) |
| 37 | if block == "" { |
| 38 | return input |
| 39 | } |
| 40 | return strings.TrimRight(input, "\n") + "\n\n" + block |
| 41 | } |
| 42 | |
| 43 | func sameImageDigests(a, b []string) bool { |
| 44 | if len(a) != len(b) { |
| 45 | return false |
| 46 | } |
| 47 | for i := range a { |
| 48 | if a[i] != b[i] { |
| 49 | return false |
| 50 | } |
| 51 | } |
| 52 | return true |
| 53 | } |
| 54 | |
| 55 | func boundedVisionSummary(text string) string { |
| 56 | text = strings.TrimSpace(text) |
| 57 | if len(text) <= visionSummaryMaxBytes { |
| 58 | return text |
| 59 | } |
| 60 | limit := visionSummaryMaxBytes - len("\n[summary truncated]") |
| 61 | cut := text[:limit] |
| 62 | for !utf8.ValidString(cut) { |
| 63 | cut = cut[:len(cut)-1] |
| 64 | } |
| 65 | return cut + "\n[summary truncated]" |
| 66 | } |
| 67 |