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src/store/pic/getSmallThumbByHash.js

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+import { GET_SMALLTHUMB_BY_HASH as MSSQL_GET } from '../../providers/mssql/queries/pic.js';
+import { GET_SMALLTHUMB_BY_HASH as SQLITE_GET } from '../../providers/sqlite3/queries/pic.js';
+import resolvePicAccess from './resolvePicAccess.js';
+import makeRunner from '../runner.js';
+
+export default function getSmallThumbByHash(provider) {
+  const authorize = resolvePicAccess(provider);
+  const sql = provider?.dialect === 'sqlite3' ? SQLITE_GET : MSSQL_GET;
+
+  /**
+   * Returns the small thumbnail image (AVIF, 40px max edge) for a given hash.
+   *
+   * @param {number} googleAuthId - The id of the Google auth user.
+   * @param {string} fullHash - The full image hash.
+   * @param {object} [tx] - Optional transaction to run within.
+   * @returns {Promise<{buffer: Buffer, w: number, h: number, contentType: string}>} The small thumbnail image.
+   * @throws {Error} If the image is not found.
+   *
+   * @example
+   * const thumb = await store.pic.getSmallThumbByHash(42, 'abc123');
+   * // => { buffer, w, h, contentType: 'image/avif' }
+   */
+  return async (googleAuthId, fullHash, tx) => {
+    await authorize(googleAuthId, fullHash, tx);
+
+    const runner = makeRunner(provider, tx);
+    const result = await runner.query(sql, { hash: fullHash });
+
+    const row = result.rows[0];
+    if (!row) {
+      throw new Error('Image not found');
+    }
+
+    const buffer = row.buffer ?? row.smallthumbbinary;
+    if (!buffer) {
+      throw new Error('Image not found');
+    }
+
+    return {
+      buffer,
+      w: row.w,
+      h: row.h,
+      contentType: 'image/avif',
+    };
+  };
+}