adilallo
60 lines
1.6 KiB
TypeScript
60 lines
1.6 KiB
TypeScript
import { constants as fsConstants } from "node:fs";
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import { access, readdir } from "node:fs/promises";
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import path from "node:path";
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import { getUploadRootFromEnv } from "./uploadRoot";
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import { isValidUploadFileId } from "./uploadConstants";
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export type ResolvedUploadFile = {
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absolutePath: string;
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/** MIME inferred from extension (no sidecar file in v1). */
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contentType: string;
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};
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function contentTypeForFilename(fileName: string): string {
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const ext = path.extname(fileName).toLowerCase();
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switch (ext) {
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case ".jpg":
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case ".jpeg":
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return "image/jpeg";
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case ".png":
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return "image/png";
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case ".webp":
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return "image/webp";
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case ".gif":
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return "image/gif";
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case ".pdf":
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return "application/pdf";
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default:
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return "application/octet-stream";
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}
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}
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/**
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* Resolves `id` (UUID stem) to the single matching file `{id}.*` under UPLOAD_ROOT.
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* Returns null if missing, ambiguous, or invalid id.
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*/
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export async function resolveUploadedFileById(
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id: string,
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): Promise<ResolvedUploadFile | null> {
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if (!isValidUploadFileId(id)) return null;
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const root = getUploadRootFromEnv();
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if (!root) return null;
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const entries = await readdir(root);
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const prefix = `${id}.`;
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const matches = entries.filter((e) => e.startsWith(prefix));
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if (matches.length !== 1) return null;
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const absolutePath = path.join(root, matches[0]!);
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try {
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await access(absolutePath, fsConstants.R_OK);
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} catch {
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return null;
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}
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return {
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absolutePath,
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contentType: contentTypeForFilename(matches[0]!),
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};
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}
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