add leetcode user -c that user can login with cookie (#31)

Author: yihong0618

README.md

@@ -7,6 +7,7 @@
 # leetcode-cli
 
 > Note: This repository is forked from [leetcode-cli](https://github.com/skygragon/leetcode-cli) for temporary usage. 
+> Note: Copy cookie from webbrowser and Using **leetcode user -c** can temporary fix can't [login problem](https://github.com/jdneo/vscode-leetcode/issues/478).
 
 <img src="https://github.com/skygragon/leetcode-cli/raw/master/docs/logo.png" align="right">
 
@@ -39,6 +40,7 @@ Great thanks to leetcode.com, a really awesome website!
 
 	Read help first                         $ leetcode help
 	Login with your leetcode account        $ leetcode user -l
+	Cookie login with cookie				$ leetcode user -c
 	Browse all questions                    $ leetcode list
 	Choose one question                     $ leetcode show 1 -g -l cpp
 	Coding it!

lib/commands/user.js

@@ -21,6 +21,12 @@ const cmd = {
         default:  false,
         describe: 'Login'
       })
+      .option('c', {
+        alias:    'cookie',
+        type:     'boolean',
+        default:  false,
+        describe: 'cookieLogin'
+      })
       .option('L', {
         alias:    'logout',
         type:     'boolean',
@@ -29,6 +35,7 @@ const cmd = {
       })
       .example(chalk.yellow('leetcode user'), 'Show current user')
       .example(chalk.yellow('leetcode user -l'), 'User login')
+      .example(chalk.yellow('leetcode user -c'), 'User Cookie login')
       .example(chalk.yellow('leetcode user -L'), 'User logout');
   }
 };
@@ -59,7 +66,22 @@ cmd.handler = function(argv) {
       log.info('Successfully logout as', chalk.yellow(user.name));
     else
       log.fail('You are not login yet?');
-  } else {
+  } else if (argv.cookie) {
+    // session
+    prompt.colors = false;
+    prompt.message = '';
+    prompt.start();
+    prompt.get([
+      {name: 'login', required: true},
+      {name: 'cookie', required: true}
+    ], function(e, user) {
+      if (e) return log.fail(e)
+      core.cookieLogin(user, function(e, user) {
+      if (e) return log.fail(e);
+      log.info('Successfully cookie login as', chalk.yellow(user.name));
+      });
+    });
+    } else {
     // show current user
     user = session.getUser();
     if (user) {

lib/plugins/leetcode.js

@@ -538,4 +538,19 @@ plugin.login = function(user, cb) {
   });
 };
 
+plugin.cookieLogin = function(user, cb) {
+  // re pattern for cookie chrome or firefox
+  const SessionPattern = /LEETCODE_SESSION=(.+?)(;|$)/;
+  const csrfPattern = /csrftoken=(.+?)(;|$)/;
+  const reSessionResult = SessionPattern.exec(user.cookie);
+  const reCsrfResult = csrfPattern.exec(user.cookie);
+  if (reSessionResult === null || reCsrfResult === null) {
+    return cb('invalid cookie?')
+  }
+  user.sessionId = reSessionResult[1];
+  user.sessionCSRF = reCsrfResult[1];
+  session.saveUser(user);
+  plugin.getUser(user, cb);
+}
+
 module.exports = plugin;