I have a facebook application with has to post updates on specific facebook page. The application has rights to post updates on the facebook wall of the page's admin. But how can i get the (admin's) users access token, which i need to get the access token of the page. Do i have to save the access tokenthe first time the user allows the app to post (offline access)?
Thanks for your reply!
I use the Facebook C# SDK as well. You'll need the following permissions:
manage_pages
read_stream
publish_stream
HTTP Get to "me/accounts" and get the .data object off of the returned value. This will be a list of the following:
var list = ApiGet("me/accounts").data;
foreach (dynamic acc in list)
{
var name = (string)acc.name;
var accessToken = (string)acc.access_token;
var category = (string)acc.category;
var pageId = (string)acc.id;
}
As you can see, each one of the pages have their own unique access token.
Related
I've implemented social authentication in my application, and I get the accesstoken successfully.
But when I use that access token to get the user's public profile, I get only the user's ID and the user's name.
I can't get the other properties of the user like the user's profile picture.
when I try this:
Json = await httpClient.GetStringAsync($"https://graph.facebook.com/v5.0/{userWithOnlyId.Id}?access_token={accessToken}");
I get only the user's id and name.
when I do this as stated in this facebook doc :
await httpClient.GetStringAsync(
$"https://graph.facebook.com/me?fields=profile_pic&access_token={accessToken}");
I get a 403 forbidden error.
Is there something I did wrong ? I've tried several things I found here on stackoverflow but up till now I have no solution.
There is an example(section: Retrieving a Person's Profile):
https://graph.facebook.com/<PSID>?fields=first_name,last_name,profile_pic&access_token=<PAGE_ACCESS_TOKEN>
Looks like you need to provide a PSID
ASID(App-scoped ID) - it's a user-id that is unique for each app.
It means that this user will have different ASID for each app. I think that you have only one app.
To get a Page-scoped ID from an App-scoped ID, send a POST request to
the /pages_id_mapping root node
I'm developing a public website and what I want to do is pretty straightforward, but I'm pulling my hair out trying to get everything working right.
I administer an open Facebook group and I want to display the public facebook events of this group on my website.
I can't seem to figure out how to setup my authentication so that I can access the event data. Here is my code for using my application to get an auth token:
var fb = new FacebookClientWrapper();
dynamic result = fb.Get("oauth/access_token", new
{
client_id = AppSettings.AppID,
client_secret = AppSettings.AppSecret,
grant_type = "client_credentials"
});
fb.AccessToken = result.access_token;
I know this works fine because I can access some information - for example, if I access a specific event by its ID, I can retrieve that information.
The problem occurs when I try to retrieve a list of events with fields within a date range:
[HttpGet]
public object GetEventDetails(string unixStartDateTime, string unixEndDateTime)
{
var parms = new Dictionary<string, object>();
parms.Add("fields", new[] { "id","name","description","start_time","venue" });
if (!String.IsNullOrEmpty(unixStartDateTime)) { parms.Add("since", unixStartDateTime); }
if (!String.IsNullOrEmpty(unixEndDateTime)) { parms.Add("until", unixEndDateTime); }
var eventsLink = String.Format(#"/{0}/events", AppSettings.GroupID);
return ObjectFactory.GetInstance<IFacebookClient>().Get(eventsLink,parms);
}
(I'm aware that even if this did succeed, the return value wouldn't be serializable - I'm not concerned about that quite yet).
This GET request returns the following message:
(OAuthException - #102) A user access token is required to request this resource.
So the message is quite clear: I need a user access token to get the data I've requested. The question is - what is the best way to do this? Can I give my application a certain permission to read this data? I've looked over all the permissions available to apps, but I don't see one that would do the trick.
I don't want to require people to log onto Facebook to look at public event data, and I love the idea of allowing people with no technical experience to essentially update the website content by posting Facebook events to the group. Right now, I have to duplicate anything they do.
I would think this kind of application would be very common, but no matter what I've read or tried, I can't quite find an example of the same thing that works.
From the docs at https://developers.facebook.com/docs/graph-api/reference/v2.0/group/events you need
A user access token for a member of the group with user_groups permission.
To avoid the hassle, you could create such an Access Token via the Graph Explorer and then store it in your application. Remember to exchange that Access Token to a long-lived one (https://developers.facebook.com/docs/facebook-login/access-tokens/#extending), and that you have to renew the Access Token every 60 days afterwards.
Scenario:
User has completed the OAuth process and has given our app publish_actions, publish_stream, user_friends, and user_photos permissions.
While we have the user token from the user logging in, we have retrieved and persisted the user's Facebook id
Also while we have the user token, we have created a photo album to later post photos to and persisted the Facebook album id
NOTE: We have not persisted the user token for legacy reasons
At a later time, we attempt to post a photo to the album previously created using the following code:
FacebookClient client = null;
Dictionary<string, object> parameters = null;
string path;
FacebookMediaObject media = null;
client = new FacebookClient();
client.AppId = "{our app id}";
client.AppSecret = "{our app secret}";
media = new FacebookMediaObject();
media.ContentType = "image/jpg";
media.FileName = "AnyAllContactTypesProblem.jpg";
media.SetValue(File.ReadAllBytes(Server.MapPath(".") + "\\" + media.FileName));
parameters = new Dictionary<string,object>();
parameters.Add("name",
"Test Image 1");
parameters.Add("source",
media);
path = "/" + "{album id}" + "/photos";
dynamic result = client.Post(path,
parameters);
The POST operation results in the following exception:
(OAuthException - #102) A user access token is required to request this resource.
The Facebook documentation indicates that an "app token" which is derived from the app id and app secret can be used as the access token for posting a photo on someone's behalf as long as publish_stream permission has been provided to the app which it has in our case.
Are we missing something needed in the code above or has Facebook changed the required permissions for posting photos?
Thanks in advance.
I don't know from where did you read this-
an "app token" which is derived from the app id and app secret can be used as the access token for posting a photo on someone's behalf as long as publish_stream permission has been provided to the app which it has in our case.
But this is not true. Once you got the publish permission, you can post the stories/feeds on the wall and get the basic info using the app access token. Posting the photos is not allowed! Here's what the documentation says-
App access tokens can also be used to publish content to Facebook on behalf of a person who has granted an open graph publishing permission to your application. Reference
One thing that you can do-
Save the extended token to your server (that expires in 60-days, after that user must go through the login again to get the new token), to get the extended token-
GET /oauth/access_token?
grant_type=fb_exchange_token&
client_id={app-id}&
client_secret={app-secret}&
fb_exchange_token={short-lived-token}
I have some doubts:
I want to show the photos from my company facebook page on my company web site using C# SDK.
How can I do that with an access token which never expires? Or why my app id and app secret is not enough?
var fb = new FacebookWebClient("app_id", "app_secret");
If I only use this it says:
An active access token must be used to query information about the current user.
Basically I see non-sense to ask for a valid access token because it's not about to interact with any of my visitors' page but just simply show my photos from my company facebook page to them.
UPDATE: To get my app token I am doing:
var oauthClient = new FacebookOAuthClient
{
AppId = "app_id",
AppSecret = "app_secret"
};
dynamic result = oauthClient.GetApplicationAccessToken();
accessToken = result.access_token;
But now, how I can show photos from my account?
If I do it like:
var fb = new FacebookWebClient(accessToken);
//Get the album data
dynamic albums = fb.Get("app_id/albums");
I receive an empty JSON but I am sure that my account on facebook has several albums.
Tokens can and do expire. You must have code in place to handle when it does.
Your appid and app secret are not enough because at least one of the page admins MUST grant access to the page to get photo data via the Graph API.
Remember, the API is not only Facebook's sandbox, but they also are the ones who built it, so you're going to have to play by their rules.
I need help on oAuth authentication to facebook. I am able to do the steps that facebook API mentioned and successfully authenticated, get my profile information as well as post to my news feed.
I want my application to login automatically rather than routing to Facebook login page on behalf of a user(i.e. get credentials from db and do auto oauth) . So that the user can type a message on application and click on button should submit a post to facebook page.
Thanks
What you need to get is an access token. This is a key which allows you continued access to the account until your the token expires or the user cancels it.
When you first authenticate if you have set the required permissions you get an authtoken which you can store and use to initiale further calls.
var client = new FacebookClient("my_access_token");
dynamic result = client.Get("19292868552_118464504835613");
string id = result.id;
string fromName = result.from.name;
string fromCategory = result.from.category;
string message = result.message;
int likes = result.likes;
foreach (dynamic comment in result.comments.data) {
string commentId = comment.id;
string commentMessage = comment.message;
}
see this article for details about the process:
http://benbiddington.wordpress.com/2010/04/23/facebook-graph-api-getting-access-tokens/