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src/providers/storage.js

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+/**
+ * Shared filesystem storage utilities for database providers.
+ */
+
+import { join } from 'node:path';
+import { promises as fsPromises } from 'node:fs';
+
+export async function safeWrite(filePath, buffer) {
+  if (buffer == null) return;
+  const buf = Buffer.isBuffer(buffer) ? buffer : Buffer.from(buffer);
+  await fsPromises.writeFile(filePath, buf);
+}
+
+export async function findFileByHash(dir, hash, ext = '') {
+  if (!dir || !hash) return null;
+  if (ext) {
+    const candidate = join(dir, hash + ext);
+    try {
+      await fsPromises.access(candidate);
+      return candidate;
+    } catch {
+      // fallback
+    }
+  }
+  const candidateNoExt = join(dir, hash);
+  try {
+    await fsPromises.access(candidateNoExt);
+    return candidateNoExt;
+  } catch {
+    // fallback
+  }
+  try {
+    const files = await fsPromises.readdir(dir);
+    const match = files.find((f) => f === hash || f.startsWith(hash + '.'));
+    if (match) return join(dir, match);
+  } catch {
+    // ignore
+  }
+  return null;
+}
+
+export async function safeReadByHash(dir, hash, ext = '') {
+  const filePath = await findFileByHash(dir, hash, ext);
+  if (!filePath) return null;
+  try {
+    return await fsPromises.readFile(filePath);
+  } catch (err) {
+    if (err.code === 'ENOENT') return null;
+    throw err;
+  }
+}
+
+export async function safeDeleteByHash(dir, hash) {
+  if (!dir || !hash) return;
+  try {
+    const files = await fsPromises.readdir(dir);
+    const matches = files.filter((f) => f === hash || f.startsWith(hash + '.'));
+    await Promise.all(matches.map((f) => fsPromises.unlink(join(dir, f))));
+  } catch (err) {
+    if (err.code !== 'ENOENT') throw err;
+  }
+}
+
+export function extFromMimetype(mimetype) {
+  if (!mimetype) return '';
+  const type = mimetype.trim().toLowerCase().split(';')[0];
+  const map = {
+    'application/pdf': '.pdf',
+    'text/plain': '.txt',
+    'text/csv': '.csv',
+    'text/html': '.html',
+    'text/markdown': '.md',
+    'image/avif': '.avif',
+    'image/png': '.png',
+    'image/jpeg': '.jpg',
+    'image/jpg': '.jpg',
+    'image/webp': '.webp',
+    'image/gif': '.gif',
+    'image/svg+xml': '.svg',
+    'application/json': '.json',
+    'application/zip': '.zip',
+    'application/xml': '.xml',
+    'application/octet-stream': '.bin',
+  };
+  if (map[type]) return map[type];
+  if (type.startsWith('image/')) return '.' + type.slice(6).replace('+xml', '');
+  if (type.startsWith('text/')) return '.' + type.slice(5);
+  return '';
+}