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fb-graph-clj

A clojure library that provides a simple layer around clj-http to access the facebook graph api.

Usage

(require '[fb-graph-clj.core :as fb])

(def ac "...see below...")
(fb/with-access-token ac
  (fb/pull [:me :friends]))
=> {:status 200,
    :headers
    {"content-type" "text/javascript; charset=UTF-8"
     "date" "Wed, 30 Nov 2011 07:24:32 GMT"
     "cache-control" "private, no-cache, no-store, must-revalidate"
     ...}
    :body
    {:data [...],
     :paging
     {:next     "https://graph.facebook.com:443/me/friends?access_token=...",
      :previous "https://graph.facebook.com:443/me/friends?access_token=..."}}}

Facebook often returns a list of objects in the data element of the response body, this is paired with a paging element. It is convenient to be able to treat the response as sequable.

Here's how you do it:

(let [response (fb/pull [:me :friends] {:limit 10})]
  (doseq [{:keys [name id] :as friend} (fb/data-seq response)]
    (println "Hello" name "with ID:" id)))

data-seq is lazy and will only request the next page from facebook when it needs it.

How to get an Access Token

In order to make calls against the facebook graph api you need an Access Token. There are several ways to do this, you can jump through several OAUTH hoops and deal with callbacks, redirects, etc. Alternatively you can go to this Facebook Developer API page and copy one.

The API reference page will handle all of the OAUTH stuff and give you a set of links with a valid Access Token on the query string. After logging into facebook just look down the page for the link to your friends, cut and paste the access token from the URL into the REPL and use the with-access-token macro and your ready to go.

You can also pass the access token as option if you wish, like this:

(fb/pull [:me :friends] {:access_token "..."})
=> [a response containing a list of your friends]

Installation

fb-graph-clj is available as a Maven artifact from Clojars:

[fb-graph-clj "1.0.0-SNAPSHOT"]

Related Libraries

If you need a library that has built in handling for OAUTH then check out clj-facebook-graph.

My thanks to clj-facebook-graph for providing some inspiration and the idea behind the [:me :friends] to facebook URL translation.

License

Released under the MIT License: http://www.opensource.org/licenses/mit-license.php