compose: Hide subscribe button and change text for waiting period users.

Fixes #10124.
Users in the waiting period category cannot subscribe other users to
a stream. When a user tries to mention another unsubscribed user, a
warning message appears with a subscribe button on it to subscribe
the other user.
This commit removes the subscribe button and changes the warning text
for users in the waiting period category.

frontend_tests/node_tests/compose.js

@@ -86,6 +86,7 @@ var me = {
     email: 'me@example.com',
     user_id: 30,
     full_name: 'Me Myself',
+    date_joined: new Date(),
 };
 
 var alice = {

frontend_tests/node_tests/templates.js

@@ -534,10 +534,16 @@ run_test('compose_invite_users', () => {
     var args = {
         email: 'hamlet@zulip.com',
         name: 'Hamlet',
+        can_subscribe_other_users: true,
     };
     var html = render('compose-invite-users', args);
     var button = $(html).find("button:first");
     assert.equal(button.text(), "translated: Subscribe");
+
+    args.can_subscribe_other_users = false;
+    html = render('compose-invite-users', args);
+    button = $(html).find("button:first");
+    assert.equal(button.length, 0);
 });
 
 run_test('compose_all_everyone', () => {

static/js/compose.js

@@ -725,7 +725,11 @@ exports.initialize = function () {
                 });
 
                 if (existing_invites.indexOf(email) === -1) {
-                    var context = {email: email, name: data.mentioned.full_name};
+                    var context = {
+                        email: email,
+                        name: data.mentioned.full_name,
+                        can_subscribe_other_users: page_params.can_subscribe_other_users,
+                    };
                     var new_row = templates.render("compose-invite-users", context);
                     error_area.append(new_row);
                 }

static/templates/compose-invite-users.handlebars

@@ -1,6 +1,10 @@
 <div class="compose_invite_user" data-useremail="{{email}}">
+    {{#if can_subscribe_other_users}}
     <p>{{#tr this}}<strong>__name__</strong> is not subscribed to this stream. They will not be notified unless you subscribe them.{{/tr}}</p>
     <div class="compose_invite_user_controls">
         <button class="btn btn-warning compose_invite_link" >{{t "Subscribe" }}</button><button type="button" class="compose_invite_close close">&times;</button>
     </div>
+    {{else}}
+    <p>{{#tr this}}<strong>__name__</strong> is not subscribed to this stream. They will not be notified if you mention them.{{/tr}}</p>
+    {{/if}}
 </div>

zerver/lib/events.py

@@ -223,6 +223,7 @@ def fetch_initial_state_data(user_profile: UserProfile,
         )
 
         state['can_create_streams'] = user_profile.can_create_streams()
+        state['can_subscribe_other_users'] = user_profile.can_subscribe_other_users()
         state['cross_realm_bots'] = list(get_cross_realm_dicts())
         state['is_admin'] = user_profile.is_realm_admin
         state['is_guest'] = user_profile.is_guest

zerver/tests/test_home.py

@@ -51,6 +51,7 @@ class HomeTest(ZulipTestCase):
             "avatar_url_medium",
             "bot_types",
             "can_create_streams",
+            "can_subscribe_other_users",
             "cross_realm_bots",
             "custom_profile_field_types",
             "custom_profile_fields",