I had some trouble using one of the OAuth libs I found on the net in my Scala Android app. Instead of finding a way to use the lib I just rolled my own... Not sure if it would work against linkedin (it works well with Yammer, which uses HTTPS). Well, below is the relevant code, mind you I'm pretty new to both Android and Scala so there are probably better ways to accomplish this.
The layout file "R.layout.authorization" is very basic contains with two buttons and a text field in a RelativeLayout.
class Authorization extends Activity {
val client = new DefaultHttpClient()
val reqUrl = "https://www.yammer.com/oauth/request_token"
val authUrl = "https://www.yammer.com/oauth/authorize?oauth_token="
val accessUrl = "https://www.yammer.com/oauth/access_token"
override def onCreate(bundle:Bundle) = {
super.onCreate(bundle)
this.setContentView(R.layout.authorization)
val authButton = findViewById(R.id.authButton).asInstanceOf[Button]
val getCodeButton = findViewById(R.id.getCode).asInstanceOf[Button]
val prefs = getSharedPreferences(PreferenceFile(), 0)
if(prefs.contains("oauth_request_token")) {
authButton.setVisibility(View.VISIBLE)
}
setupListeners(authButton, getCodeButton)
}
private def getAuthVerifier() = {
val authVerifierBox:EditText = Authorization.this.findViewById(R.id.authVerifier).asInstanceOf[EditText]
if(authVerifierBox != null && authVerifierBox.getText() != null) {
authVerifierBox.getText().toString()
} else {
""
}
}
private def setupListeners(authButton:Button, getCodeButton:Button) = {
authButton.setOnClickListener(new View.OnClickListener() {
override def onClick(view:View) = {
retrieveAuthTokenAndSecret()
}
})
getCodeButton.setOnClickListener(new View.OnClickListener() {
override def onClick(view:View) = {
try {
// Retrieve a request token with an async task and then start the browser...
// Use of an implicit definition to convert tuple to an async task.
(() => {
// Task to perform
val reqPost = new HttpPost(reqUrl)
reqPost.setHeader("Authorization", OAuthHeaderBuilder(null,null,null))
reqPost.setHeader("Content-Type", "application/x-www-form-urlencoded")
val reqResp= client.execute(reqPost)
reqResp.getEntity()
},
(entity:HttpEntity) => {
// PostExecute handle result from task...
if(entity != null) {
val reader = new BufferedReader(new InputStreamReader(entity.getContent()))
val line = reader.readLine()
val (oauth_request_token, oauth_token_secret) = OAuthTokenExtractor(line)
// Store request tokens so they can be used when retrieving auth tokens...
val editor = getSharedPreferences(PreferenceFile(), 0).edit()
editor.putString("oauth_request_token", oauth_request_token)
editor.putString("oauth_token_secret", oauth_token_secret)
editor.commit()
// Start browser...
val intent = new Intent(Intent.ACTION_VIEW, Uri.parse(authUrl + oauth_request_token))
startActivity(intent)
val authButton = findViewById(R.id.authButton).asInstanceOf[Button]
authButton.setVisibility(View.VISIBLE)
}
}).doInBackground()
} catch {
case e:Exception => Log.e("ERROR", "ERROR IN CODE:"+e.toString())
}
}
})
}
private def retrieveAuthTokenAndSecret() = {
val authVerifier = getAuthVerifier()
val accessPost = new HttpPost(accessUrl)
val prefs = getSharedPreferences(PreferenceFile(), 0)
val token = prefs.getString("oauth_request_token","")
val secret = prefs.getString("oauth_token_secret","")
accessPost.setHeader("Authorization", OAuthHeaderBuilder(token, secret, authVerifier))
accessPost.setHeader("Content-Type", "application/x-www-form-urlencoded")
val accessResp = client.execute(accessPost)
val entity = accessResp.getEntity()
if(entity != null) {
val reader = new BufferedReader(new InputStreamReader(entity.getContent()))
val builder = new StringBuilder()
val line = reader.readLine()
val (oauth_token, oauth_token_secret) = OAuthTokenExtractor(line)
val result = new Intent()
val editor = getSharedPreferences(PreferenceFile(), 0).edit()
editor.putString("oauth_token", oauth_token)
editor.putString("oauth_token_secret", oauth_token_secret)
editor.commit()
setResult(Activity.RESULT_OK, result)
finish()
}
}
}
The OAuthHeaderBuilder is basically a copy of the Yammer oauth sample code:
object OAuthHeaderBuilder {
// Apply function taken from the Yammer oauth sample
def apply(token:String, secret:String,verifier:String):String = {
val buff = new StringBuilder()
val currentTime = System.currentTimeMillis()
// Hardcoded values for consumer key and secret...
val consumerKey = "<your consumer key here>"
val consumerSecret = "<your consumer secret here>"
buff.append("OAuth realm=\"");
buff.append("\", oauth_consumer_key=\"");
buff.append(consumerKey);
buff.append("\", ");
if (token != null) {
buff.append("oauth_token=\"");
buff.append(token);
buff.append("\", ");
}
buff.append("oauth_signature_method=\"");
buff.append("PLAINTEXT");
buff.append("\", oauth_signature=\"");
buff.append(consumerSecret);
buff.append("%26");
if (secret != null) {
buff.append(secret);
}
buff.append("\", oauth_timestamp=\"");
buff.append(currentTime);
buff.append("\", oauth_nonce=\"");
buff.append(currentTime);
if (verifier != null) {
buff.append("\", ");
buff.append("oauth_verifier=\"");
buff.append(verifier);
}
buff.append("\", oauth_version=\"1.0\"");
return buff.toString();
}
}
And inorder to extract the tokens I made a OAuthTokenExtractor object...
object OAuthTokenExtractor {
def apply(line:String) = {
val token = (line split ("&")).find(x => x.startsWith("oauth_token=")) match {
case Some(oauth_token) => (oauth_token split ("=") )(1)
case _ => ""
}
val secret = (line split ("&")).find(x => x.startsWith("oauth_token_secret=")) match {
case Some(oauth_token_secret) => (oauth_token_secret split ("=") )(1)
case _ => ""
}
(token,secret)
}
}
Hope it helps :)