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utils/postBase64Files.js

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+const fs = require('fs')
+const path = require('path')
+
+function decodeBase64Buffer(data) {
+  if (!data || typeof data !== 'string') {
+    throw new Error('داده فایل نامعتبر است')
+  }
+  const payload = data.includes(',') ? data.split(',')[1] : data
+  if (!payload) {
+    throw new Error('داده base64 خالی است')
+  }
+  return Buffer.from(payload, 'base64')
+}
+
+async function saveBase64PostFiles(files, imageDir, videoDir, { allowEmpty = false } = {}) {
+  if (!Array.isArray(files) || files.length === 0) {
+    if (allowEmpty) return []
+    throw new Error('هیچ فایلی ارسال نشده است')
+  }
+
+  return Promise.all(
+    files.map(async (file, index) => {
+      if (!file?.data || !file?.type) {
+        throw new Error(`فایل ${index + 1} ناقص است`)
+      }
+
+      const buffer = decodeBase64Buffer(file.data)
+      if (!buffer.length) {
+        throw new Error(`فایل ${index + 1} خالی است`)
+      }
+
+      const dir = String(file.type).startsWith('video/') ? videoDir : imageDir
+      const safeName = path
+        .basename(file.name || `upload-${index}`)
+        .replace(/[^\w.\-()+\s]/g, '_')
+      const filename = `${Date.now()}-${index}-${safeName}`
+      const filePath = path.join(dir, filename)
+
+      await fs.promises.writeFile(filePath, buffer)
+
+      return {
+        path: filePath,
+        filename,
+        mimetype: file.type,
+      }
+    })
+  )
+}
+
+module.exports = {
+  decodeBase64Buffer,
+  saveBase64PostFiles,
+}