Added "Opt-in existing subscribers" option to newsletter creation

refs https://github.com/TryGhost/Team/issues/1528

- adds "opt-in existing" toggle to newsletter modal that's only shown when creating a newsletter
  - defaults to true
- updated newsletter save flow to show confirmation before creation
  - alters message to reflect auto-subscribe selection
  - count of existing subscribed members is not implemented as it's not yet supported by the API
- updated newsletter adapter and save flow to use auto opt-in selection
  - when option is checked the save URL is changed to `POST /members/?opt_in_existing=true`
- modified task button component to ignore a task return value of `canceled` so when it's received the buttons returns to the idle state instead of showing a saved or failed state
  - used by save routine when the "Back to edit" button is clicked in the create confirmation modal

app/adapters/newsletter.js

@@ -0,0 +1,14 @@
+import ApplicationAdapter from 'ghost-admin/adapters/application';
+
+export default class Newsletter extends ApplicationAdapter {
+    buildIncludeURL(store, modelName, id, snapshot, requestType, query) {
+        const url = this.buildURL(modelName, id, snapshot, requestType, query);
+        const parsedUrl = new URL(url);
+
+        if (snapshot?.adapterOptions?.optInExisting) {
+            parsedUrl.searchParams.append('opt_in_existing', 'true');
+        }
+
+        return parsedUrl.toString();
+    }
+}

app/components/gh-task-button.js

@@ -84,7 +84,7 @@ const GhTaskButton = Component.extend({
         }
 
         let value = this.get('task.last.value');
-        return (taskName === lastTaskName) && !isBlank(value) && value !== false;
+        return (taskName === lastTaskName) && !isBlank(value) && value !== false && value !== 'canceled';
     }),
 
     isSuccessClass: computed('isSuccess', function () {
@@ -99,7 +99,7 @@ const GhTaskButton = Component.extend({
             return false;
         }
 
-        return (taskName === lastTaskName) && this.get('task.last.error') !== undefined;
+        return (taskName === lastTaskName) && this.get('task.last.error') !== undefined && this.task.last?.error !== null;
     }),
 
     isFailureClass: computed('isFailure', function () {

app/components/modals/edit-newsletter.hbs

@@ -13,7 +13,11 @@
                 </div>
 
                 {{#if (eq this.tab "settings")}}
-                    <Modals::EditNewsletter::Settings @newsletter={{@data.newsletter}} />
+                    <Modals::EditNewsletter::Settings
+                        @newsletter={{@data.newsletter}}
+                        @optInExisting={{this.optInExisting}}
+                        @setOptInExisting={{this.setOptInExisting}}
+                    />
                 {{else}}
                     <Modals::EditNewsletter::Design @newsletter={{@data.newsletter}} />
                 {{/if}}

app/components/modals/edit-newsletter.js

@@ -1,4 +1,5 @@
 import Component from '@glimmer/component';
+import ConfirmCreateModal from './edit-newsletter/confirm-create';
 import ConfirmNewsletterEmailModal from './edit-newsletter/confirm-newsletter-email';
 import {action} from '@ember/object';
 import {inject as service} from '@ember/service';
@@ -13,6 +14,7 @@ export default class EditNewsletterModal extends Component {
     };
 
     @tracked tab = 'settings';
+    @tracked optInExisting = this.args.data.newsletter.isNew;
 
     willDestroy() {
         super.willDestroy(...arguments);
@@ -32,12 +34,33 @@ export default class EditNewsletterModal extends Component {
         this.saveTask.perform();
     }
 
+    @action
+    setOptInExisting(value) {
+        this.optInExisting = value;
+    }
+
     @task
     *saveTask() {
         try {
+            yield this.args.data.newsletter.validate({});
+
+            const {optInExisting} = this;
+
+            const shouldCreate = yield this.modals.open(ConfirmCreateModal, {
+                optInExisting,
+                newsletter: this.args.data.newsletter
+            });
+
+            if (!shouldCreate) {
+                // ensure task button returns to idle state
+                return 'canceled';
+            }
+
             const newEmail = this.args.data.newsletter.senderEmail;
 
-            const result = yield this.args.data.newsletter.save();
+            const result = yield this.args.data.newsletter.save({
+                adapterOptions: {optInExisting}
+            });
 
             if (result._meta?.sent_email_verification) {
                 yield this.modals.open(ConfirmNewsletterEmailModal, {
@@ -51,8 +74,8 @@ export default class EditNewsletterModal extends Component {
             return result;
         } catch (e) {
             if (e === undefined) {
-                // validation error
-                return false;
+                // ensure task button shows failed state
+                throw new Error('Validation failed');
             }
 
             throw e;

app/components/modals/edit-newsletter/confirm-create.hbs

@@ -0,0 +1,47 @@
+<div class="modal-content">
+    <header class="modal-header" data-test-modal="confirm-newsletter-email">
+        <h1>All set? Here's what happens next</h1>
+    </header>
+    <button type="button" class="close" role="button" title="Close" {{on "click" (fn @close false)}}>{{svg-jar "close"}}<span class="hidden">Close</span></button>
+
+    <div class="modal-body">
+        <p>
+            {{#if @data.optInExisting}}
+                {{!-- TODO: add members count once API supports it --}}
+                {{!-- {{#let (members-count-fetcher query=(hash filter="")) as |countFetcher|}}
+                    Your newsletter <strong>{{@data.newsletter.name}}</strong> will be
+                    immediately made live and your
+                    {{#if countFetcher.count}}<strong>{{countFetcher.count}}</strong>{{/if}}
+                    existing newsletter subscribers will be automatically opted-in to receive it.
+                {{/let}} --}}
+
+                Your newsletter <strong>{{@data.newsletter.name}}</strong> will be
+                immediately made live and your existing newsletter subscribers
+                will be automatically opted-in to receive it.
+            {{else}}
+                Your newsletter <strong>{{@data.newsletter.name}}</strong> will be
+                immediately made live. Your existing newsletter subscribers will
+                <strong>not</strong> be opted-in to receive it.
+            {{/if}}
+        </p>
+    </div>
+
+    <div class="modal-footer">
+        <button
+            type="button"
+            class="gh-btn"
+            {{on "click" (fn @close false)}}
+        >
+            <span>Back to edit</span>
+        </button>
+
+        <button
+            type="button"
+            class="gh-btn gh-btn-black"
+            {{on "click" (fn @close true)}}
+            {{on-key "Enter"}}
+        >
+            <span>Create newsletter</span>
+        </button>
+    </div>
+</div>

app/components/modals/edit-newsletter/settings.hbs

@@ -83,6 +83,23 @@
                     </div>
                 </div>
             </GhFormGroup>
+
+            {{#if @newsletter.isNew}}
+                <GhFormGroup>
+                    <label for="opt-in-existing" class="modal-fullsettings-title">Opt-in existing subscribers</label>
+                    <div class="for-switch small">
+                        <div class="container">
+                            <input
+                                type="checkbox"
+                                id="opt-in-existing"
+                                checked={{@optInExisting}}
+                                {{on "check" this.setOptInExisting}}
+                            >
+                            <button type="button" class="input-toggle-component" {{on "click" this.toggleOptInExisting}}></button>
+                        </div>
+                    </div>
+                </GhFormGroup>
+            {{/if}}
         </div>
     </fieldset>
 </div>

app/components/modals/edit-newsletter/settings.js

@@ -24,4 +24,14 @@ export default class EditNewsletterSettingsForm extends Component {
     onValueChange(property, value) {
         this.args.newsletter[property] = value;
     }
+
+    @action
+    setOptInExisting(event) {
+        this.args.setOptInExisting(event.target.value);
+    }
+
+    @action
+    toggleOptInExisting() {
+        this.args.setOptInExisting(!this.args.optInExisting);
+    }
 }

mirage/config/newsletters.js

@@ -5,7 +5,7 @@ export default function mockNewsletters(server) {
     server.get('/newsletters/', paginatedResponse('newsletters'));
     server.get('/newsletters/:id/');
 
-    server.post('/newsletters/', function ({newsletters}) {
+    server.post('/newsletters/', function ({newsletters}, {queryParams}) {
         const attrs = this.normalizedRequestAttrs();
 
         // sender email can't be set without verification
@@ -23,6 +23,13 @@ export default function mockNewsletters(server) {
             };
         }
 
+        if (queryParams.opt_in_existing === 'true') {
+            newsletters.all().models.forEach((n) => {
+                newsletter.members.mergeCollection(n.members);
+            });
+            newsletter.save();
+        }
+
         return collection;
     });
 

mirage/models/newsletter.js

@@ -0,0 +1,5 @@
+import {Model, hasMany} from 'miragejs';
+
+export default Model.extend({
+    members: hasMany()
+});