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// Lightweight MIME helpers to avoid new dependencies.
const EXTENSION_TO_MIME: Record<string, string> = {
png: "image/png",
jpg: "image/jpeg",
jpe: "image/jpeg",
jpeg: "image/jpeg",
gif: "image/gif",
webp: "image/webp",
svg: "image/svg+xml",
pdf: "application/pdf",
txt: "text/plain",
csv: "text/csv",
json: "application/json",
mp3: "audio/mpeg",
wav: "audio/wav",
ogg: "audio/ogg",
mp4: "video/mp4",
mov: "video/quicktime",
webm: "video/webm",
zip: "application/zip",
gz: "application/gzip",
tgz: "application/gzip",
tar: "application/x-tar",
html: "text/html",
htm: "text/html",
md: "text/markdown",
};
export function guessMimeFromUrl(url: string): string | undefined {
try {
const pathname = new URL(url).pathname;
const ext = pathname.split(".").pop()?.toLowerCase();
if (ext && EXTENSION_TO_MIME[ext]) return EXTENSION_TO_MIME[ext];
} catch {
/* ignore */
}
return undefined;
}
export function pickSafeMime(
forwardedType: string | null,
blobType: string | undefined,
url: string
): string {
const inferred = guessMimeFromUrl(url);
if (forwardedType) return forwardedType;
if (
inferred &&
(!blobType || blobType === "application/octet-stream" || blobType.startsWith("text/plain"))
) {
return inferred;
}
if (blobType) return blobType;
return inferred || "application/octet-stream";
}
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