Initial import of verae-request-splitter from zapier monorepo

src/splitRequest.js

@@ -0,0 +1,71 @@
+/**
+ * Split a Zapier/middleware request into chain vs archive parts.
+ * @module splitRequest
+ */
+
+import { createHash } from 'node:crypto';
+
+/**
+ * @param {string} data
+ * @returns {string}
+ */
+export function sha256Hex(data) {
+  return createHash('sha256').update(String(data), 'utf8').digest('hex');
+}
+
+/**
+ * @param {object} body
+ * @returns {{
+ *   chain: { sha256: string, hashAlg: string, data?: string },
+ *   archivePuts: Array<{ kind: string, sha256: string, record: object }>,
+ *   includeAttached: boolean
+ * }}
+ */
+export function splitRequest(body = {}) {
+  const sha256 = (body.sha256 || (body.data != null ? sha256Hex(body.data) : '')).toLowerCase();
+  if (!sha256) {
+    throw new Error('data or sha256 is required');
+  }
+  const includeAttached = Boolean(body.includeAttached);
+  const archivePuts = [];
+  if (body.publicMetadata && Object.keys(body.publicMetadata).length) {
+    archivePuts.push({
+      kind: 'publicMeta',
+      sha256,
+      record: { publicMetadata: body.publicMetadata },
+    });
+  }
+  if (body.privateMetadata && Object.keys(body.privateMetadata).length) {
+    archivePuts.push({
+      kind: 'privateMeta',
+      sha256,
+      record: { privateMetadata: body.privateMetadata },
+    });
+  }
+  const files = Array.isArray(body.files) ? body.files : [];
+  for (const f of files) {
+    const bytes = f.contentBase64
+      ? Buffer.from(String(f.contentBase64), 'base64')
+      : Buffer.from(String(f.data ?? ''), 'utf8');
+    const fileHash = sha256Hex(bytes);
+    archivePuts.push({
+      kind: 'file',
+      sha256,
+      record: {
+        path: f.path || f.filename || 'file.bin',
+        size: bytes.length,
+        contentSha256: fileHash,
+        contentBase64: bytes.toString('base64'),
+      },
+    });
+  }
+  return {
+    chain: {
+      sha256,
+      hashAlg: body.hashAlg || 'SHA256',
+      data: body.data,
+    },
+    archivePuts,
+    includeAttached,
+  };
+}