feat(mailchimp): add mailchimp integration

packages/backend/src/apps/mailchimp/auth/generate-auth-url.js

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+import { URLSearchParams } from 'url';
+
+export default async function generateAuthUrl($) {
+  const oauthRedirectUrlField = $.app.auth.fields.find(
+    (field) => field.key == 'oAuthRedirectUrl'
+  );
+  const redirectUri = oauthRedirectUrlField.value;
+  const searchParams = new URLSearchParams({
+    response_type: 'code',
+    client_id: $.auth.data.clientId,
+    redirect_uri: redirectUri,
+  });
+
+  const url = `https://login.mailchimp.com/oauth2/authorize?${searchParams.toString()}`;
+
+  await $.auth.set({
+    url,
+  });
+}

packages/backend/src/apps/mailchimp/auth/index.js

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+import generateAuthUrl from './generate-auth-url.js';
+import verifyCredentials from './verify-credentials.js';
+import isStillVerified from './is-still-verified.js';
+
+export default {
+  fields: [
+    {
+      key: 'oAuthRedirectUrl',
+      label: 'OAuth Redirect URL',
+      type: 'string',
+      required: true,
+      readOnly: true,
+      value: '{WEB_APP_URL}/app/mailchimp/connections/add',
+      placeholder: null,
+      description:
+        'When asked to input a redirect URL in Mailchimp, enter the URL above.',
+      clickToCopy: true,
+    },
+    {
+      key: 'clientId',
+      label: 'Client ID',
+      type: 'string',
+      required: true,
+      readOnly: false,
+      value: null,
+      placeholder: null,
+      description: null,
+      clickToCopy: false,
+    },
+    {
+      key: 'clientSecret',
+      label: 'Client Secret',
+      type: 'string',
+      required: true,
+      readOnly: false,
+      value: null,
+      placeholder: null,
+      description: null,
+      clickToCopy: false,
+    },
+  ],
+
+  generateAuthUrl,
+  verifyCredentials,
+  isStillVerified,
+};

packages/backend/src/apps/mailchimp/auth/is-still-verified.js

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+import getCurrentUser from '../common/get-current-user.js';
+
+const isStillVerified = async ($) => {
+  const currentUser = await getCurrentUser($);
+  return !!currentUser.user_id;
+};
+
+export default isStillVerified;

packages/backend/src/apps/mailchimp/auth/verify-credentials.js

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+import getCurrentUser from '../common/get-current-user.js';
+
+const verifyCredentials = async ($) => {
+  const oauthRedirectUrlField = $.app.auth.fields.find(
+    (field) => field.key == 'oAuthRedirectUrl'
+  );
+  const redirectUri = oauthRedirectUrlField.value;
+  const params = new URLSearchParams({
+    grant_type: 'authorization_code',
+    client_id: $.auth.data.clientId,
+    client_secret: $.auth.data.clientSecret,
+    redirect_uri: redirectUri,
+    code: $.auth.data.code,
+  });
+
+  const { data } = await $.http.post(
+    'https://login.mailchimp.com/oauth2/token',
+    params.toString()
+  );
+
+  await $.auth.set({
+    accessToken: data.access_token,
+    tokenType: data.token_type,
+  });
+
+  const currentUser = await getCurrentUser($);
+
+  await $.auth.set({
+    clientId: $.auth.data.clientId,
+    clientSecret: $.auth.data.clientSecret,
+    scope: $.auth.data.scope,
+    idToken: data.id_token,
+    expiresIn: data.expires_in,
+    refreshToken: data.refresh_token,
+    serverPrefix: currentUser.dc,
+    screenName: currentUser.login.login_name,
+  });
+};
+
+export default verifyCredentials;