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src/util/manifestAttachment.js

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+import { computeSkeleHash } from '../services/companyImport/imageHasher.js';
+
+const skeleCache = new Map();
+
+/**
+ * Strips raw binary `thumbavif` buffer and attaches `skeledash` (base62 skelehash string).
+ *
+ * @param {object} file - Raw attachment file object from libdashstore.
+ * @returns {Promise<object>} Formatted attachment with `skeledash` and without `thumbavif`.
+ */
+export async function formatAttachment(file) {
+    if (!file || typeof file !== 'object') return file;
+
+    let skeledash = file.skeledash || file.skelehash || file.meta?.skeledash || file.meta?.skelehash || null;
+
+    if (!skeledash && file.hash && skeleCache.has(file.hash)) {
+        skeledash = skeleCache.get(file.hash);
+    }
+
+    if (!skeledash && file.thumbavif) {
+        try {
+            const result = await computeSkeleHash(file.thumbavif);
+            skeledash = result?.base62 || null;
+            if (file.hash && skeledash) {
+                skeleCache.set(file.hash, skeledash);
+            }
+        } catch {
+            skeledash = null;
+        }
+    }
+
+    const { thumbavif: _thumbavif, ...rest } = file;
+
+    return {
+        ...rest,
+        skeledash,
+        skelehash: skeledash,
+    };
+}
+
+/**
+ * Formats a list of attachments in parallel.
+ *
+ * @param {Array<object>} files - Array of raw file attachment objects.
+ * @returns {Promise<Array<object>>}
+ */
+export async function formatAttachments(files = []) {
+    if (!Array.isArray(files) || files.length === 0) return [];
+    return Promise.all(files.map(formatAttachment));
+}