FEATURE: customize invite email message

app/assets/javascripts/discourse/controllers/invite.js.es6

@@ -6,6 +6,8 @@ export default Ember.Controller.extend(ModalFunctionality, {
   // If this isn't defined, it will proxy to the user model on the preferences
   // page which is wrong.
   emailOrUsername: null,
+  hasCustomMessage: false,
+  customMessage: null,
   inviteIcon: "envelope",
 
   isAdmin: function(){
@@ -27,6 +29,7 @@ export default Ember.Controller.extend(ModalFunctionality, {
   }.property('isAdmin', 'emailOrUsername', 'invitingToTopic', 'isPrivateTopic', 'model.groupNames', 'model.saving'),
 
   disabledCopyLink: function() {
+    if (this.get('hasCustomMessage')) return true;
     if (this.get('model.saving')) return true;
     if (Ember.isEmpty(this.get('emailOrUsername'))) return true;
     const emailOrUsername = this.get('emailOrUsername').trim();
@@ -37,7 +40,7 @@ export default Ember.Controller.extend(ModalFunctionality, {
     // when inviting to private topic via email, group name must be specified
     if (this.get('isPrivateTopic') && Ember.isEmpty(this.get('model.groupNames')) && Discourse.Utilities.emailValid(emailOrUsername)) return true;
     return false;
-  }.property('emailOrUsername', 'model.saving', 'isPrivateTopic', 'model.groupNames'),
+  }.property('emailOrUsername', 'model.saving', 'isPrivateTopic', 'model.groupNames', 'hasCustomMessage'),
 
   buttonTitle: function() {
     return this.get('model.saving') ? 'topic.inviting' : 'topic.invite_reply.action';
@@ -71,6 +74,11 @@ export default Ember.Controller.extend(ModalFunctionality, {
     return this.get('isAdmin') && (Discourse.Utilities.emailValid(this.get('emailOrUsername')) || this.get('isPrivateTopic') || !this.get('invitingToTopic')) && !Discourse.SiteSettings.enable_sso && Discourse.SiteSettings.enable_local_logins && !this.get('isMessage');
   }.property('isAdmin', 'emailOrUsername', 'isPrivateTopic', 'isMessage', 'invitingToTopic'),
 
+  // Show Custom Message textarea? (only shown when inviting new user to forum)
+  showCustomMessage: function() {
+    return this.get('model') === this.currentUser;
+  }.property('model'),
+
   // Instructional text for the modal.
   inviteInstructions: function() {
     if (Discourse.SiteSettings.enable_sso || !Discourse.SiteSettings.enable_local_logins) {
@@ -136,9 +144,15 @@ export default Ember.Controller.extend(ModalFunctionality, {
             'topic.invite_private.email_or_username_placeholder';
   }.property(),
 
+  customMessagePlaceholder: function() {
+    return I18n.t('invite.custom_message_placeholder');
+  }.property(),
+
   // Reset the modal to allow a new user to be invited.
   reset() {
     this.set('emailOrUsername', null);
+    this.set('hasCustomMessage', false);
+    this.set('customMessage', null);
     this.get('model').setProperties({
       groupNames: null,
       error: false,
@@ -147,7 +161,6 @@ export default Ember.Controller.extend(ModalFunctionality, {
       inviteLink: null
     });
   },
-
   actions: {
 
     createInvite() {
@@ -162,7 +175,7 @@ export default Ember.Controller.extend(ModalFunctionality, {
 
       model.setProperties({ saving: true, error: false });
 
-      return this.get('model').createInvite(this.get('emailOrUsername').trim(), groupNames).then(result => {
+      return this.get('model').createInvite(this.get('emailOrUsername').trim(), groupNames, this.get('customMessage')).then(result => {
               model.setProperties({ saving: false, finished: true });
               if (!this.get('invitingToTopic')) {
                 Invite.findInvitedBy(this.currentUser, userInvitedController.get('filter')).then(invite_model => {
@@ -213,6 +226,15 @@ export default Ember.Controller.extend(ModalFunctionality, {
               }
               model.setProperties({ saving: false, error: true });
             });
+    },
+
+    showCustomMessageBox() {
+      this.toggleProperty('hasCustomMessage');
+      if (this.get('hasCustomMessage')) {
+        this.set('customMessage', I18n.t('invite.custom_message_template'));
+      } else {
+        this.set('customMessage', null);
+      }
     }
   }
 

app/assets/javascripts/discourse/models/user.js.es6

@@ -321,10 +321,10 @@ const User = RestModel.extend({
            Discourse.SiteSettings['newuser_max_' + type + 's'] > 0;
   },
 
-  createInvite(email, group_names) {
+  createInvite(email, group_names, custom_message) {
     return Discourse.ajax('/invites', {
       type: 'POST',
-      data: { email, group_names }
+      data: { email, group_names, custom_message }
     });
   },
 

app/assets/javascripts/discourse/templates/modal/invite.hbs

@@ -22,6 +22,12 @@
       <label>{{{groupInstructions}}}</label>
       {{group-selector groupFinder=groupFinder groupNames=model.groupNames placeholderKey="topic.invite_private.group_name"}}
     {{/if}}
+
+    {{#if showCustomMessage}}
+      <br><label><a {{action "showCustomMessageBox"}}>{{i18n 'invite.custom_message'}}</a></label>
+      {{#if hasCustomMessage}}{{textarea value=customMessage placeholder=customMessagePlaceholder}}{{/if}}
+    {{/if}}
+
   {{/if}}
 </div>
 <div class="modal-footer">

app/controllers/invites_controller.rb

@@ -43,7 +43,7 @@ class InvitesController < ApplicationController
     end
 
     begin
-      if Invite.invite_by_email(params[:email], current_user, _topic=nil,  group_ids)
+      if Invite.invite_by_email(params[:email], current_user, _topic=nil,  group_ids, params[:custom_message])
         render json: success_json
       else
         render json: failed_json, status: 422

app/jobs/regular/invite_email.rb

@@ -9,7 +9,7 @@ module Jobs
       raise Discourse::InvalidParameters.new(:invite_id) unless args[:invite_id].present?
 
       invite = Invite.find_by(id: args[:invite_id])
-      message = InviteMailer.send_invite(invite)
+      message = InviteMailer.send_invite(invite, args[:custom_message])
       Email::Sender.new(message, :invite).send
     end
 

app/mailers/invite_mailer.rb

@@ -3,7 +3,11 @@ require_dependency 'email/message_builder'
 class InviteMailer < ActionMailer::Base
   include Email::BuildEmailHelper
 
-  def send_invite(invite)
+  class UserNotificationRenderer < ActionView::Base
+    include UserNotificationsHelper
+  end
+
+  def send_invite(invite, custom_message=nil)
     # Find the first topic they were invited to
     first_topic = invite.topics.order(:created_at).first
 
@@ -31,15 +35,29 @@ class InviteMailer < ActionMailer::Base
                   site_description: SiteSetting.site_description,
                   site_title: SiteSetting.title)
     else
+      html = nil
+      if custom_message.present? && custom_message =~ /{invite_link}/
+        custom_message.gsub!("{invite_link}", "#{Discourse.base_url}/invites/#{invite.invite_key}")
+        custom_message.gsub!("{site_title}", SiteSetting.title) if custom_message =~ /{site_title}/
+        custom_message.gsub!("{site_description}", SiteSetting.site_description) if custom_message =~ /{site_description}/
+
+        html = UserNotificationRenderer.new(Rails.configuration.paths["app/views"]).render(
+          template: 'email/invite',
+          format: :html,
+          locals: { message: PrettyText.cook(custom_message).html_safe,
+                    classes: 'custom-invite-email' }
+        )
+      end
+
       build_email(invite.email,
                   template: 'invite_forum_mailer',
+                  html_override: html,
                   invitee_name: invitee_name,
                   site_domain_name: Discourse.current_hostname,
                   invite_link: "#{Discourse.base_url}/invites/#{invite.invite_key}",
                   site_description: SiteSetting.site_description,
                   site_title: SiteSetting.title)
     end
-
   end
 
   def send_password_instructions(user)

app/models/invite.rb

@@ -72,8 +72,8 @@ class Invite < ActiveRecord::Base
     end
   end
 
-  def self.invite_by_email(email, invited_by, topic=nil, group_ids=nil)
-    create_invite_by_email(email, invited_by, topic, group_ids, true)
+  def self.invite_by_email(email, invited_by, topic=nil, group_ids=nil, custom_message=nil)
+    create_invite_by_email(email, invited_by, topic, group_ids, true, custom_message)
   end
 
   # generate invite link
@@ -85,7 +85,7 @@ class Invite < ActiveRecord::Base
   # Create an invite for a user, supplying an optional topic
   #
   # Return the previously existing invite if already exists. Returns nil if the invite can't be created.
-  def self.create_invite_by_email(email, invited_by, topic=nil, group_ids=nil, send_email=true)
+  def self.create_invite_by_email(email, invited_by, topic=nil, group_ids=nil, send_email=true, custom_message=nil)
     lower_email = Email.downcase(email)
     user = User.find_by(email: lower_email)
 
@@ -126,7 +126,7 @@ class Invite < ActiveRecord::Base
       end
     end
 
-    Jobs.enqueue(:invite_email, invite_id: invite.id) if send_email
+    Jobs.enqueue(:invite_email, invite_id: invite.id, custom_message: custom_message) if send_email
 
     invite.reload
     invite

config/locales/client.en.yml

@@ -3026,3 +3026,21 @@ en:
           top: "There are no more top topics."
           bookmarks: "There are no more bookmarked topics."
           search: "There are no more search results."
+
+    invite:
+      custom_message: "Make your invite a little bit more personal by writing a custom message (optional)."
+      custom_message_placeholder: "Enter your custom message, use {invite_link} for specifying invite link."
+      custom_message_template: |
+        Hello,
+
+        You've been invited you to join
+
+        > **{site_title}**
+        >
+        > {site_description}
+
+        If you're interested, click the link below:
+
+        {invite_link}
+
+        This invitation is from a trusted user, so you won't need to log in.

spec/jobs/invite_email_spec.rb

@@ -16,7 +16,7 @@ describe Jobs::InviteEmail do
 
       it 'delegates to the test mailer' do
         Email::Sender.any_instance.expects(:send)
-        InviteMailer.expects(:send_invite).with(invite).returns(mailer)
+        InviteMailer.expects(:send_invite).with(invite, nil).returns(mailer)
         Jobs::InviteEmail.new.execute(invite_id: invite.id)
       end
 
@@ -26,4 +26,3 @@ describe Jobs::InviteEmail do
 
 
 end
-

spec/mailers/invite_mailer_spec.rb

@@ -6,6 +6,8 @@ describe InviteMailer do
 
     context "invite to site" do
       let(:invite) { Fabricate(:invite) }
+
+      context "default invite message" do
         let(:invite_mail) { InviteMailer.send_invite(invite) }
 
         it 'renders the invitee email' do
@@ -33,6 +35,62 @@ describe InviteMailer do
         end
       end
 
+      context "custom invite message" do
+
+        context "custom message includes invite link" do
+          let(:custom_invite_mail) { InviteMailer.send_invite(invite, "Hello,\n\nYou've been invited you to join\n\n<a href=\"javascript:alert('HACK!')\">Click me.</a>\n\n> **{site_title}**\n>\n> {site_description}\n\nIf you're interested, click the link below:\n\n{invite_link}\n\nThis invitation is from a trusted user, so you won't need to log in.") }
+
+          it 'renders the invitee email' do
+            expect(custom_invite_mail.to).to eql([invite.email])
+          end
+
+          it 'renders the subject' do
+            expect(custom_invite_mail.subject).to be_present
+          end
+
+          it 'renders site domain name in subject' do
+            expect(custom_invite_mail.subject).to match(Discourse.current_hostname)
+          end
+
+          it 'renders the html' do
+            expect(custom_invite_mail.html_part).to be_present
+          end
+
+          it 'renders custom_message' do
+            expect(custom_invite_mail.html_part.to_s).to match("You've been invited you to join")
+          end
+
+          it 'renders the inviter email' do
+            expect(custom_invite_mail.from).to eql([SiteSetting.notification_email])
+          end
+
+          it 'sanitizes HTML' do
+            expect(custom_invite_mail.html_part.to_s).to_not match("HACK!")
+          end
+
+          it 'renders invite link' do
+            expect(custom_invite_mail.html_part.to_s).to match("#{Discourse.base_url}/invites/#{invite.invite_key}")
+          end
+        end
+
+        context "custom message does not include invite link" do
+          let(:custom_invite_without_link) { InviteMailer.send_invite(invite, "Hello,\n\nYou've been invited you to join\n\n> **{site_title}**\n>\n> {site_description}") }
+
+          it 'renders default body' do
+            expect(custom_invite_without_link.body).to be_present
+          end
+
+          it 'does not render html' do
+            expect(custom_invite_without_link.html_part).to eq(nil)
+          end
+
+          it 'renders invite link' do
+            expect(custom_invite_without_link.body.encoded).to match("#{Discourse.base_url}/invites/#{invite.invite_key}")
+          end
+        end
+      end
+    end
+
     context "invite to topic" do
       let(:topic) { Fabricate(:topic, excerpt: "Topic invite support is now available in Discourse!") }
       let(:invite) { topic.invite(topic.user, 'name@example.com') }