Add IdentityServer4 sample.

Author: Eric Koleda

samples/IdentityServer4.gs

@@ -0,0 +1,77 @@
+/**
+ * Demonstrates how to authorize access to the IdentityServer4 Demo API using
+ * the Authorization Code grant type.
+ * @see https://demo.identityserver.io/
+ * http://docs.identityserver.io/en/release/topics/grant_types.html#authorization-code
+ * @see http://docs.identityserver.io/en/release/endpoints/authorize.html
+ * @see http://docs.identityserver.io/en/release/endpoints/token.html
+ */
+
+// Test credentials for the Demo API.
+var CLIENT_ID = 'server.code';
+var CLIENT_SECRET = 'secret';
+
+/**
+ * Authorizes and makes a request to the IdentityServer4 Demo API.
+ */
+function run() {
+  var service = getService();
+  if (service.hasAccess()) {
+    var url = 'https://demo.identityserver.io/api/test';
+    var response = UrlFetchApp.fetch(url, {
+      headers: {
+        Authorization: 'Bearer ' + service.getAccessToken()
+      }
+    });
+    var result = JSON.parse(response.getContentText());
+    Logger.log(JSON.stringify(result, null, 2));
+  } else {
+    var authorizationUrl = service.getAuthorizationUrl();
+    Logger.log('Open the following URL and re-run the script: %s',
+        authorizationUrl);
+  }
+}
+
+/**
+ * Reset the authorization state, so that it can be re-tested.
+ */
+function reset() {
+  getService().reset();
+}
+
+/**
+ * Configures the service.
+ */
+function getService() {
+  return OAuth2.createService('IdentityServer4')
+      // Set the endpoint URLs.
+      .setAuthorizationBaseUrl('https://demo.identityserver.io/connect/authorize')
+      .setTokenUrl('https://demo.identityserver.io/connect/token')
+
+      // Set the client ID and secret.
+      .setClientId(CLIENT_ID)
+      .setClientSecret(CLIENT_SECRET)
+
+      // Set the name of the callback function that should be invoked to
+      // complete the OAuth flow.
+      .setCallbackFunction('authCallback')
+
+      // Set the property store where authorized tokens should be persisted.
+      .setPropertyStore(PropertiesService.getUserProperties())
+
+      // Set the scope and additional Google-specific parameters.
+      .setScope('openid api offline_access');
+}
+
+/**
+ * Handles the OAuth callback.
+ */
+function authCallback(request) {
+  var service = getService();
+  var authorized = service.handleCallback(request);
+  if (authorized) {
+    return HtmlService.createHtmlOutput('Success!');
+  } else {
+    return HtmlService.createHtmlOutput('Denied');
+  }
+}