process password protected pdf files

app/javascript/elements/prompt_password.js

@@ -0,0 +1,19 @@
+export default class extends HTMLElement {
+  connectedCallback () {
+    const input = document.createElement('input')
+
+    input.type = 'hidden'
+    input.name = 'password'
+    input.value = prompt('Enter PDF password')
+
+    this.form.append(input)
+
+    this.form.requestSubmit()
+
+    this.remove()
+  }
+
+  get form () {
+    return this.closest('form')
+  }
+}