Error Using Facebook Login With Parse Server

Question

I'm one of the many users migrating off of Parse and onto Heroku (w/ MongoLab sandbox), using https://parse.com/docs/server/guide as a guide.

Things were going fine with the migration (objects can be created / retrieved via REST commands on the remote repo) until I tried using (iOS) Facebook login.

The method:

[PFFacebookUtils logInInBackgroundWithReadPermissions: ... ]

which had been working when Parse hosted, now returns the following error:

[Error]: Facebook auth is invalid for this user. (Code: 101, Version: 1.12.0)

---

Note: the only change to my (previously working) iOS code is to point the Parse server to my new, manually-hosted repo, as shown below:

 let parseConfiguration = ParseClientConfiguration(block: { (ParseMutableClientConfiguration) -> Void in
        ParseMutableClientConfiguration.applicationId = "<*APP ID*>"
        ParseMutableClientConfiguration.clientKey = "<*CLIENT KEY*>"
        ParseMutableClientConfiguration.server = "https://<*HEROKU APP ID*>.herokuapp.com/parse"
    })

 Parse.initializeWithConfiguration(parseConfiguration) 

& the only modification to the open source Parse Server code (https://github.com/ParsePlatform/parse-server-example) is substituting the configuration to match my Parse / mongo identification:

var api = new ParseServer({
  databaseURI:     'mongodb://<*UNIUQUE ID*>' || 'mongodb://localhost:27017/dev',
  cloud: process.env.CLOUD_CODE_MAIN || __dirname + '/cloud/main.js',
  appId: '<*PARSE APP ID*>',
  masterKey: '<*PARSE MASTER KEY*>'
});

Answer 1

you need to add the key facebookAppIds which contains an array of valid facebook app ids, this is mentioned here in the docs.

alternatively, add the FACEBOOK_APP_ID key as referenced [here] (https://github.com/ParsePlatform/parse-server/issues/82)

Answer 2

I don't know if you already had or tried this already but I was in a very similar situation as you and what fixed it for me was this:

In AppDelegate.swift, the ParseClientConfiguration must be initialized BEFORE the Parse Facebook Utils initialization in didFinishLaunchingWithOptions:

...

// *** Initialize Parse. ***
let config = ParseClientConfiguration(block: {
    (ParseMutableClientConfiguration) -> Void in
    ParseMutableClientConfiguration.applicationId = appKey;
    ParseMutableClientConfiguration.clientKey = clientKey;
    ParseMutableClientConfiguration.server = serverURL;
});

Parse.initializeWithConfiguration(config);

// *NOTE: Putting the following line after after Parse.initializeWithConfiguration(config) fixed the issue
// After this change, the user is no longer nil and does not print "Uh oh. The user cancelled the Facebook login.". Instead, it executes the `if let user = user` block
PFFacebookUtils.initializeFacebookWithApplicationLaunchOptions(launchOptions)

...

Hope this helps at least somebody!