Wordpress OAuth 3.1.96: Unable to Authenticate

Your Rocket.Chat version: 0.25.0

I'm having trouble authenticating using the Wordpress OAuth Server plugin, v3.1.96. I've been following the information in #747 but am still striking issues. I don't know if this is because the WP OAuth Server is now a later version that the one tested in the instructions.

On the WP side:

• I've added $me_data['id'] = $me_data['ID']; to the filters.php file and uploaded a plugin zip with this change.
• I also tried adding the code from the Gist to functions.php, but outcomes are the same.
• I've checked all the Grant Types in the Advanced Configuration menu.
• I've double and triple checked my Client ID and secret between WP and my RC instance.
• I'm positive I've added the default RC redirect URL to the WP Client Details dialogue and saved it.

Scenario 1

• In WP under Advanced Settings / Misc Settings I have "Require Exact Redirect URI" checked.

When attempting to login, the new window launched from RC and displays the following error:

{"error":"redirect_uri_mismatch","error_description":"The redirect URI provided is missing or does not match","error_uri":"http:\/\/tools.ietf.org\/html\/rfc6749#section-3.1.2"}

Nothing in the RC logs.

Scenario 2

• In WP I have unchecked "Require Exact Redirect URI"

This time I am taken to the WP login form in the pop-up window, where I am able to login. However, after logging in, no re-direct occurs. I am simply shown my WP website content in this pop-up window.

RocketChat has not logged in, in the other window.

Scenario 3

• As per Scenario 2, however I am still logged in to the WP website.

This time, when clicking the WP icon from the RC sign-in page, the pop-up window launches, then closes.

RocketChat shows an "Internal Server Error" message.

RC logs:

I20160408-15:13:43.047(0) at: cl7sculdskpuygnlmll8f9cklmmi0yyleiecfpol W20160408-15:13:43.897(0) (oauth_server.js:398) Error in OAuth Server: Failed to fetch identity from wordpress at http://mywebsiteurl.com/oauth/me. failed [400] {"error":"invalid_request","error_description":"Missing or invalid parameter(s)"} I20160408-15:13:44.077(0) Exception while invoking method 'login' Error: Failed to fetch identity from wordpress at http://mywebsiteurl.com/oauth/me. failed [400] {"error":"invalid_request","error_description":"Missing or invalid parameter(s)"} at CustomOAuth.getIdentity (packages/rocketchat_custom-oauth/custom_oauth_server.coffee:92:16) at Object.handleOauthRequest (packages/rocketchat_custom-oauth/custom_oauth_server.coffee:101:20) at OAuth._requestHandlers.(anonymous function) (packages/oauth2/oauth2_server.js:8:1) at middleware (packages/oauth/oauth_server.js:173:1) at packages/oauth/oauth_server.js:146:1

Scenario 4

• When adding a new Client to the WP OAuth Server, there is a field to input the "Redirect URI:". The default text for this field says, "Leave Blank for Client Credentials." Therefore, in this scenario, I am leaving it blank.

The outcome is the same as Scenarios 2 and 3.

Scenario 5

• The same setup as Scenario 4 with the blank client credentials, however, I am also re-checking the "Require Exact Redirect URI" checkbox under Advanced / Misc settings.

The outcome is the same as Scenarios 2 and 3.

Not sure what other information to provide. Have tested in the latest versions of both Firefox and Chromium.

Any assistance much appreciated.