added warning page for browsers without streams downloading big files (#1175)

* added warning page for browsers without streams downloading big files

* fixed illustration size in Edge

* updated nostreams style

app/ui/downloadPassword.js

@@ -0,0 +1,83 @@
+const html = require('choo/html');
+
+module.exports = function(state, emit) {
+  const fileInfo = state.fileInfo;
+  const invalid = fileInfo.password === null;
+
+  const div = html`
+    <div
+      class="h-full w-full flex flex-col items-center justify-center bg-white py-8 max-w-md mx-auto"
+    >
+      <h1 class="mb-4">${state.translate('downloadFilesTitle')}</h1>
+      <p
+        class="w-full mb-4 md:w-4/5 font-light text-center text-grey-darkest leading-normal"
+      >
+        ${state.translate('downloadMessage')}
+      </p>
+      <form
+        class="flex flex-row flex-no-wrap w-full md:w-4/5"
+        onsubmit="${checkPassword}"
+        data-no-csrf
+      >
+        <input
+          id="password-input"
+          class="w-full border-l border-t border-b rounded-l-lg rounded-r-none ${invalid
+            ? 'border-red'
+            : 'border-grey'} leading-loose px-2 py-1"
+          maxlength="32"
+          autocomplete="off"
+          placeholder="${state.translate('unlockInputPlaceholder')}"
+          oninput="${inputChanged}"
+          type="password"
+        />
+        <input
+          type="submit"
+          id="password-btn"
+          class="btn rounded-r-lg rounded-l-none ${invalid
+            ? 'bg-red hover:bg-red focus:bg-red'
+            : ''}"
+          value="${state.translate('unlockButtonLabel')}"
+          title="${state.translate('unlockButtonLabel')}"
+        />
+      </form>
+      <label
+        id="password-error"
+        class="${invalid ? '' : 'invisible'} text-red my-4"
+        for="password-input"
+      >
+        ${state.translate('passwordTryAgain')}
+      </label>
+    </div>
+  `;
+
+  if (!(div instanceof String)) {
+    setTimeout(() => document.getElementById('password-input').focus());
+  }
+
+  function inputChanged(event) {
+    event.stopPropagation();
+    event.preventDefault();
+    const label = document.getElementById('password-error');
+    const input = document.getElementById('password-input');
+    const btn = document.getElementById('password-btn');
+    label.classList.add('invisible');
+    input.classList.remove('border-red');
+    btn.classList.remove('bg-red', 'hover:bg-red', 'focus:bg-red');
+  }
+
+  function checkPassword(event) {
+    event.stopPropagation();
+    event.preventDefault();
+    const el = document.getElementById('password-input');
+    const password = el.value;
+    if (password.length > 0) {
+      document.getElementById('password-btn').disabled = true;
+      state.fileInfo.url = window.location.href;
+      state.fileInfo.password = password;
+      emit('getMetadata');
+    }
+    return false;
+  }
+
+  return div;
+};