feat: 🎸 initial flow to open new window to 3rd party auth

addons/auth/addon/authenticators/oidc.js

@@ -1,7 +1,6 @@
 import BaseAuthenticator from './base';
-// import { resolve, reject } from 'rsvp';
-// import fetch from 'fetch';
-//import { Promise } from 'rsvp';
+import { resolve, reject } from 'rsvp';
+import fetch from 'fetch';
 
 /**
  *
@@ -16,6 +15,43 @@ export default class OIDCAuthenticator extends BaseAuthenticator {
     authMethod: { id: authMethodID },
   } */) { }
 
+  buildStartAuthEndpointURL(/* {
+    scope: { id: scopeID },
+    authMethod: { id: authMethodID },
+  } */) { }
+
+  /**
+   *
+   */
+  async startAuthentication(
+    creds,
+    requestCookies = true,
+    options
+  ) {
+    const body = JSON.stringify({
+      token_type: requestCookies ? 'cookie' : null
+    });
+    const authEndpointURL = this.buildStartAuthEndpointURL(options);
+    const response = await fetch(authEndpointURL, { method: 'post', body });
+    const json = await response.json();
+    const normalized = this.normalizeData(json);
+    if (response.status < 400) {
+      await this.openExternalOIDCFlow(normalized.authorization_request_url);
+      resolve(normalized);
+    } else {
+      reject();
+    }
+  }
+
+  /**
+   * Opens the specified URL in a new tab or window.  By default this uses
+   * `window.open`, but may be overriden.
+   * @param {string} url
+   */
+  openExternalOIDCFlow(url) {
+    window.open(url);
+  }
+
   async authenticate(
     // creds,
     // requestCookies = true,