MichilisandCursor
c9a600b6d6
Introduces the Go photo-api service, nginx/systemd deploy wiring, and Next.js gallery/lightbox pages so event photos can be managed and browsed. Co-authored-by: Cursor <cursoragent@cursor.com>
31 lines
1.3 KiB
Go
31 lines
1.3 KiB
Go
package imaging
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import "bytes"
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// Sniff identifies an image by magic bytes, ignoring the client-supplied
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// filename and Content-Type — same policy as backend/src/routes/media.ts
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// detectImageType. Returns the canonical content type and extension, or
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// ok=false with a human-readable reason.
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func Sniff(head []byte) (contentType, ext string, ok bool, reason string) {
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switch {
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case len(head) >= 3 && bytes.Equal(head[:3], []byte{0xFF, 0xD8, 0xFF}):
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return "image/jpeg", ".jpg", true, ""
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case len(head) >= 8 && bytes.Equal(head[:8], []byte{0x89, 'P', 'N', 'G', 0x0D, 0x0A, 0x1A, 0x0A}):
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return "image/png", ".png", true, ""
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case len(head) >= 6 && (bytes.Equal(head[:6], []byte("GIF87a")) || bytes.Equal(head[:6], []byte("GIF89a"))):
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return "image/gif", ".gif", true, ""
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case len(head) >= 12 && bytes.Equal(head[:4], []byte("RIFF")) && bytes.Equal(head[8:12], []byte("WEBP")):
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return "image/webp", ".webp", true, ""
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}
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if len(head) >= 12 && bytes.Equal(head[4:8], []byte("ftyp")) {
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brand := string(head[8:12])
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switch brand {
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case "heic", "heix", "hevc", "hevx", "mif1", "msf1":
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return "image/heic", ".heic", true, ""
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case "avif", "avis":
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return "", "", false, "AVIF is not supported, please upload JPEG, PNG, WebP, GIF or HEIC"
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}
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}
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return "", "", false, "unsupported file type, please upload JPEG, PNG, WebP, GIF or HEIC"
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}
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