Next steps

Token status

To use Facebook Login in a desktop app, you'll need to be able to embed a web browser sometimes called a webview within the token status to perform the login process. All other apps must create their own way of storing when a person has logged inand when that indicator is not there, proceed on the assumption that they are logged out.

If someone is logged out, then your app should redirect them to the Login dialog at an appropriate time — for example if they click a login button. Logging People In Whether someone is not logged into your app or not logged into Facebook, you can use the Login dialog to prompt them to do both.

If they aren't logged into Facebook, they'll be prompted to login and then move onto logging into your app. This is automatically detected, so you don't need to do anything extra to enable this behavior.

The ID of your app, found in your app's dashboard. The URL that you want to redirect the person logging in back to.

A string value created by your app to maintain state between the request and callback. This parameter should be used for preventing Cross-site Request Forgery and will be passed back to you, unchanged, in your redirect URI.

Determines whether the token status data included when the redirect back to the app occurs is in URL parameters or fragments. See the Confirming Identity section to choose which type your app should use.

This can be one of: code. Response data is included as URL parameters and contains code parameter an encrypted string unique to each login request. This is the default behavior if this parameter is not specified. It's most useful when your server will be handling the token. Response data is included as a URL fragment and contains an access token. This is most useful when the client will be handling the token.

Status of PAN – NSDL​​

Response data is included as a URL fragment and contains both an access token and the code parameter. Returns a comma-separated list of all Permissions granted to the app by the user at the time of login.

A comma or space separated list of Permissions to request from the person using your app. AuthenticateAsync and use the Login Dialog endpoint as the requestUri. Token status Login Dialog Response At this point in the login flow, the person will see the Login dialog and will have a choice of whether to cancel or to let the app access token status data. If the person using the app chooses Token status on the Login dialog, they grant access to their public profile, friend list and any additional Permissions your app requested.

Check Status

In all cases, the browser returns to the app, and response data indicating whether someone connected or cancelled is included. Because of the various combinations of code languages that could be used in web apps, our guide doesn't show specific examples.

Microsoft provides a guide and sample code for Windows 8 apps connecting to an "online provider" - in this case, Facebook.

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Your app needs to detect token status redirect and then read the access token out of the URI using the mechanisms provided by the OS and development framework you are using.

You can then skip straight to the Inspecting access tokens step.

Learn more about the research Using SNT SNT is required to power certain application features and create an open source, decentralized economy.

See Handling Missing Permissions for more about what apps should do when people refuse to login. Confirming Identity Because this redirect flow involves browsers being redirected to URLs in your app from the Login dialog, traffic could directly access this URL with made-up fragments or parameters.

If the deviceToken is absent or does not match the previous deviceToken, the user is challenged every-time instead of per-device or per-session.

If your app assumed these were valid parameters, the made-up data would be used by your app for potentially malicious purposes. As a result, your app should confirm that the person using the app is the same person that you have response data for before generating an access token for them.

Authentication API

The call will need to be server-to-server, since it involves your app secret. Your app secret should never end up in client code. When token is received, it needs to be verified.

You should make an API call to an inspection endpoint that will indicate who the token was generated for and by which app. As this API call requires using an app access token, never make this call from a client.

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Instead make this call from a token status where you can securely store your app secret. When code and token are both received, both steps should be performed. Note that you can also generate your own state parameter and use it with your login request to provide CSRF protection. Your unique app secret, shown on the App Dashboard.

This app secret should never be included in client-side code or in binaries that could be decompiled. It is extremely important that it remains completely secret as it is the core of the security of your app and all the people using it. The parameter received from the Login Dialog redirect above. Note: From v2. If your call doesn't specify a version it will default to the oldest available version.

  1. Status - Status Network Token
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  5. Status of PAN – NSDL​​

The token you need to inspect. Token status a full description of the other fields, see the Getting Info about Access Tokens guide. Your app can use this to check which of the requested permissions it cannot use for any particular user. Re-asking for Declined Permissions Facebook Login lets people decline sharing some permissions with your app. It's OK to ask a person again to grant your app permissions that they've declined.

You should have a screen of education on why you think they should grant the permission to you and then re-ask. But if you invoke the Login Dialog as beforeit won't ask for that permission.

Managing API Tokens

This is because once someone has declined a permission, the Login Dialog will not re-ask them for it unless token status explicitly tell the dialog you're re-asking for a declined permission. Storing Access Tokens and Login Status At this point in the flow, you have someone authenticated and logged in. Your app is ready to make API calls on their behalf. Before doing so, it should store the access token and the login status of the person using token status app.

Storing Access Tokens After your app receives the access token from the previous step, the token should be stored so it's available to all parts of the app when it makes API calls. There is no specific process here, however in general if you're building a web app, it is best to add the token as a session variable to identify that browser session with a particular person, if token status building a native desktop or mobile app, then you should use the datastore available to your app.

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Please see our note about the size of access tokens in the access token document. Tracking login status Again, your app should store a person's login status, which helps avoid having to make additional calls secret binary options trading the Login dialog.

Whatever procedure you chose, modify your login status checking to account for it. Logging People Out You can log people out of your app by undoing whatever login status indicator you addedfor example deleting the session that indicates a person is logged in. You should also remove the stored access token. Logging someone out is not the same as revoking login permission removing previously granted authenticationwhich can be performed separately.

Because of this, build your app so it doesn't automatically force people token status have logged out back to the Login dialog. To help apps detect when this has happened, we allow them to provide a de-authorize callback URL which will be pinged whenever this occurs. You can enable a deauthorize callback through the App Dashboard. Just go to your app, then choose the Products, then Facebook Login, and finally Settings.

Status Network Token

Read our guide to parsing the signed request to see how to decode this to find out the user ID that triggered the callback. Responding to Requests to Delete User Data People can request an app to delete all information about them received from Facebook.

For responding to these requests, see Data Deletion Request Callback. Follow Us.