Add sample for LINE Login

Author: Eric Koleda

samples/LINE.gs

@@ -0,0 +1,80 @@
+/*
+ * LINE Login Integration guide:
+ * https://developers.line.biz/en/docs/line-login/web/integrate-line-login
+ */
+
+// These are called Channel ID and Channel Secret in the console.
+var CLIENT_ID = '...';
+var CLIENT_SECRET = '...';
+
+/**
+ * Authorizes and makes a request to the Line API.
+ */
+function run() {
+  var service = getService();
+  if (service.hasAccess()) {
+    var url = 'https://api.line.me/v2/profile';
+    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('LINE')
+      // Set the endpoint URLs.
+      .setAuthorizationBaseUrl('https://access.line.me/oauth2/v2.1/authorize')
+      .setTokenUrl('https://api.line.me/oauth2/v2.1/token')
+
+      // Set the requested scopes (required).
+      .setScope('profile')
+
+      // 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());
+}
+
+/**
+ * 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.');
+  }
+}
+
+/**
+ * Logs the redict URI to register.
+ */
+function logRedirectUri() {
+  Logger.log(OAuth2.getRedirectUri());
+}