Warnings for dangerous files

js/views/file_input_view.js

@@ -34,6 +34,10 @@
     template: i18n('unsupportedFileType'),
   });
 
+  Whisper.DangerousFileTypeToast = Whisper.ToastView.extend({
+    template: i18n('dangerousFileType'),
+  });
+
   Whisper.FileInputView = Backbone.View.extend({
     tagName: 'span',
     className: 'file-input',
@@ -178,6 +182,14 @@
       if (!file) {
         return;
       }
+      const { name } = file;
+      if (window.Signal.Util.isFileDangerous(name)) {
+        const toast = new Whisper.DangerousFileTypeToast();
+        toast.$el.insertAfter(this.$el);
+        toast.render();
+
+        return;
+      }
 
       const contentType = file.type;
 
@@ -297,9 +309,10 @@
 
     getFile(rawFile) {
       const file = rawFile || this.file || this.$input.prop('files')[0];
-      if (file === undefined) {
+      if (!file) {
         return Promise.resolve();
       }
+
       const attachmentFlags = this.isVoiceNote
         ? textsecure.protobuf.AttachmentPointer.Flags.VOICE_MESSAGE
         : null;