Add Login (#2)

[rbdr/dasein] / lib / twitter_helper.js

diff --git a/lib/twitter_helper.js b/lib/twitter_helper.js
new file mode 100644 (file)
index 0000000..3ab51fa
--- /dev/null
+++ b/lib/twitter_helper.js
@@ -0,0 +1,78 @@
+'use strict';
+
+const Co = require('co');
+const OAuth = require('oauth');
+const Pify = require('pify');
+
+const internals = {};
+
+internals.kRequestTokenUrl = 'https://api.twitter.com/oauth/request_token';
+internals.kAccessTokenUrl = 'https://api.twitter.com/oauth/access_token';
+internals.kVerifyCredentialsUrl = 'https://api.twitter.com/1.1/account/verify_credentials.json';
+internals.kOauthVersion = '1.0A';
+internals.kOauthSignatureMethod = 'HMAC-SHA1';
+
+module.exports = internals.TwitterHelper = class TwitterHelper {
+
+  constructor(config) {
+
+    this._oAuth = new OAuth.OAuth(
+      internals.kRequestTokenUrl,
+      internals.kAccessTokenUrl,
+      config.consumerKey,
+      config.consumerSecret,
+      internals.kOauthVersion,
+      null,
+      internals.kOauthSignatureMethod
+    );
+  }
+
+  getRequestToken() {
+
+    const self = this;
+
+    return Co(function * () {
+
+      const getOAuthRequestToken = Pify(self._oAuth.getOAuthRequestToken.bind(self._oAuth), { multiArgs: true });
+      const [oAuthToken, oAuthTokenSecret] = yield getOAuthRequestToken();
+
+      return {
+        oAuthToken,
+        oAuthTokenSecret
+      };
+    });
+  }
+
+  getAccessToken(oAuthToken, oAuthVerifier) {
+
+    const self = this;
+
+    return Co(function * () {
+
+      const getOAuthAccessToken = Pify(self._oAuth.getOAuthAccessToken.bind(self._oAuth), { multiArgs: true });
+      const [oAuthAccessToken, oAuthAccessTokenSecret] = yield getOAuthAccessToken(oAuthToken,
+                                                                                   '',
+                                                                                   oAuthVerifier);
+
+      return {
+        oAuthAccessToken,
+        oAuthAccessTokenSecret
+      };
+    });
+  }
+
+  getUser(oAuthAccessToken, oAuthAccessTokenSecret) {
+
+    const self = this;
+
+    return Co(function * () {
+
+      const get = Pify(self._oAuth.get.bind(self._oAuth), { multiArgs: true });
+      const [userResponse] = yield get(internals.kVerifyCredentialsUrl,
+                                       oAuthAccessToken,
+                                       oAuthAccessTokenSecret);
+
+      return JSON.parse(userResponse);
+    });
+  }
+};