Add auth module.

server/services/plexApi/auth.js

@@ -0,0 +1,27 @@
+import uuid from 'uuid/v1';
+import btoa from 'btoa';
+import request from 'request-promise';
+
+const rxAuthToken = /authenticationToken="([^"]+)"/;
+
+const options = (username, password) => ({
+  url: 'https://plex.tv/users/sign_in.xml',
+  headers: {
+    'X-Plex-Client-Identifier': uuid(),
+    Authorization: `Basic ${encryptUserCreds(username, password)}`,
+  },
+});
+
+const encryptUserCreds = (username, password) => {
+  const creds = `${username}:${password}`;
+  return btoa(creds);
+};
+
+const fetchToken = (username, password) => {
+  request.post(options(username, password)).then(res => {
+    const token = res.match(rxAuthToken)[1];
+    return token;
+  });
+};
+
+export default fetchToken;