Reintroduce single attachment limit

_locales/en/messages.json

@@ -551,6 +551,11 @@
     "description":
       "Shown in toast when user attempts to send .exe file, for example"
   },
+  "maxOneAttachmentToast": {
+    "message": "The limit is one attachment per message.",
+    "description":
+      "An error popup when the user has attempted to add an attachment"
+  },
   "oneNonImageAtATimeToast": {
     "message":
       "When including a non-image attachment, the limit is one attachment per message.",

js/views/file_input_view.js

@@ -42,6 +42,9 @@
   Whisper.MaxAttachmentsToast = Whisper.ToastView.extend({
     template: i18n('maximumAttachments'),
   });
+  Whisper.MaxOneAttachmentToast = Whisper.ToastView.extend({
+    template: i18n('maxOneAttachmentToast'),
+  });
 
   Whisper.FileInputView = Backbone.View.extend({
     tagName: 'span',
@@ -249,6 +252,12 @@
       toast.render();
     },
 
+    showMaxOneAttachmentError() {
+      const toast = new Whisper.MaxOneAttachmentToast();
+      toast.$el.insertAfter(this.$el);
+      toast.render();
+    },
+
     // Housekeeping
 
     addAttachment(attachment) {
@@ -268,6 +277,12 @@
       const fileName = file.name;
       const contentType = file.type;
 
+      // TODO: remove this when clients are ready to remove multiple image attachments
+      if (this.attachments.length > 0) {
+        this.showMaxOneAttachmentError();
+        return;
+      }
+
       if (window.Signal.Util.isFileDangerous(fileName)) {
         this.showDangerousError();
         return;

ts/util/lint/exceptions.json

@@ -1226,7 +1226,7 @@
     "rule": "jQuery-insertAfter(",
     "path": "js/views/file_input_view.js",
     "line": "      toast.$el.insertAfter(this.$el);",
-    "lineNumber": 216,
+    "lineNumber": 219,
     "reasonCategory": "usageTrusted",
     "updated": "2018-12-15T03:04:48.403Z",
     "reasonDetail": "Protected from arbitrary input"
@@ -1235,7 +1235,7 @@
     "rule": "jQuery-insertAfter(",
     "path": "js/views/file_input_view.js",
     "line": "      toast.$el.insertAfter(this.$el);",
-    "lineNumber": 222,
+    "lineNumber": 225,
     "reasonCategory": "usageTrusted",
     "updated": "2018-12-15T03:04:48.403Z",
     "reasonDetail": "Protected from arbitrary input"
@@ -1244,7 +1244,7 @@
     "rule": "jQuery-insertAfter(",
     "path": "js/views/file_input_view.js",
     "line": "      toast.$el.insertAfter(this.$el);",
-    "lineNumber": 230,
+    "lineNumber": 233,
     "reasonCategory": "usageTrusted",
     "updated": "2018-12-15T03:04:48.403Z",
     "reasonDetail": "Protected from arbitrary input"
@@ -1253,7 +1253,7 @@
     "rule": "jQuery-insertAfter(",
     "path": "js/views/file_input_view.js",
     "line": "      toast.$el.insertAfter(this.$el);",
-    "lineNumber": 236,
+    "lineNumber": 239,
     "reasonCategory": "usageTrusted",
     "updated": "2018-12-15T03:04:48.403Z",
     "reasonDetail": "Protected from arbitrary input"
@@ -1262,7 +1262,7 @@
     "rule": "jQuery-insertAfter(",
     "path": "js/views/file_input_view.js",
     "line": "      toast.$el.insertAfter(this.$el);",
-    "lineNumber": 242,
+    "lineNumber": 245,
     "reasonCategory": "usageTrusted",
     "updated": "2018-12-15T03:04:48.403Z",
     "reasonDetail": "Protected from arbitrary input"
@@ -1271,7 +1271,16 @@
     "rule": "jQuery-insertAfter(",
     "path": "js/views/file_input_view.js",
     "line": "      toast.$el.insertAfter(this.$el);",
-    "lineNumber": 248,
+    "lineNumber": 251,
+    "reasonCategory": "usageTrusted",
+    "updated": "2019-01-04T20:24:04.674Z",
+    "reasonDetail": "Protected from arbitrary input"
+  },
+  {
+    "rule": "jQuery-insertAfter(",
+    "path": "js/views/file_input_view.js",
+    "line": "      toast.$el.insertAfter(this.$el);",
+    "lineNumber": 257,
     "reasonCategory": "usageTrusted",
     "updated": "2018-12-15T03:04:48.403Z",
     "reasonDetail": "Protected from arbitrary input"