✨ Delegate android download

frontend/src/services/ovapi.js

@@ -254,21 +254,43 @@ function invoicePdf(invoiceNumber) {
       if (result.error !== undefined) {
         throw result
       }
-      const url = window.URL.createObjectURL(new Blob([result.data]))
-      const link = document.createElement('a')
-      link.href = url
       const filename =
-        result.headers['content-disposition'].match(/filename="([^"]+)"/)[1]
-      if (filename) link.setAttribute('download', filename)
-      document.body.appendChild(link)
-      link.click()
-      // clean up
-      document.body.removeChild(link)
-      URL.revokeObjectURL(url)
-      return result.data
+        result.headers['content-disposition']?.match(/filename="([^"]+)"/)[1] ??
+        `factura-${invoiceNumber}.pdf`
+      if (androidDownload(filename, result.data)) return result
+      regulardownload(filename, result.data)
+      return result
     })
 }
 
+function androidDownload(filename, blob) {
+  // SomenergiaPlatform is injected in mobile applications
+  // as alternative to save the PDF, since the method used
+  // for regular browers won't work. We need to convert
+  // the blob to base64 though.
+  if (!window.SomenergiaPlatform) return
+  var reader = new FileReader()
+  reader.readAsDataURL(blob)
+  reader.onloadend = function () {
+    // Remove trailing url header
+    let base64String = reader.result.replace(/.*,/, '')
+    window.SomenergiaPlatform.save(filename, base64String)
+    return base64String
+  }
+}
+function regulardownload(filename, blob) {
+  const url = window.URL.createObjectURL(new Blob([blob]))
+  const link = document.createElement('a')
+  link.href = url
+  if (filename) link.setAttribute('download', filename)
+  document.body.appendChild(link)
+  link.click()
+  // clean up
+  document.body.removeChild(link)
+  URL.revokeObjectURL(url)
+  return blob
+}
+
 export default {
   version,
   logout,