即使没有来自linkedIn 的此类特定于android 的sdk（如android 的facebook 和twitter sdk）。使用Oauth 1.0 设置linkedIn 授权仍然很容易使用：
但使用 Oauth2.0 进行授权的情况并非如此。没有太多有用的库或 android 特定示例。我尝试使用这些：
我读到 Oauth 2.0 比 1.0 更容易实现。我仍然无法这样做。
任何关于在 Android 中为 LinkedIn 实现 Oauth2.0 的指针？
【问题讨论】：
标签： android oauth-2.0 linkedin access-token
@Override
public boolean shouldOverrideUrlLoading(WebView view, String authorizationUrl) {
//This method will be called when the Auth proccess redirect to our RedirectUri.
//We will check the url looking for our RedirectUri.
if(authorizationUrl.startsWith(REDIRECT_URI)){
Log.i("Authorize", "");
Uri uri = Uri.parse(authorizationUrl);
//We take from the url the authorizationToken and the state token. We have to check that the state token returned by the Service is the same we sent.
//If not, that means the request may be a result of CSRF and must be rejected.
String stateToken = uri.getQueryParameter(STATE_PARAM);
if(stateToken==null || !stateToken.equals(STATE)){
Log.e("Authorize", "State token doesn't match");
return true;
}
//If the user doesn't allow authorization to our application, the authorizationToken Will be null.
String authorizationToken = uri.getQueryParameter(RESPONSE_TYPE_VALUE);
if(authorizationToken==null){
Log.i("Authorize", "The user doesn't allow authorization.");
return true;
}
Log.i("Authorize", "Auth token received: "+authorizationToken);
//Generate URL for requesting Access Token
String accessTokenUrl = getAccessTokenUrl(authorizationToken);
//We make the request in a AsyncTask
new PostRequestAsyncTask().execute(accessTokenUrl);
}else{
//Default behaviour
Log.i("Authorize","Redirecting to: "+authorizationUrl);
webView.loadUrl(authorizationUrl);
}
return true;
}
在你的 AsyncTask 中：
private class PostRequestAsyncTask extends AsyncTask<String, Void, Boolean>{
@Override
protected void onPreExecute(){
pd = ProgressDialog.show(MainActivity.this, "", MainActivity.this.getString(R.string.loading),true);
}
@Override
protected Boolean doInBackground(String... urls) {
if(urls.length>0){
String url = urls[0];
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpost = new HttpPost(url);
try{
HttpResponse response = httpClient.execute(httpost);
if(response!=null){
//If status is OK 200
if(response.getStatusLine().getStatusCode()==200){
String result = EntityUtils.toString(response.getEntity());
//Convert the string result to a JSON Object
JSONObject resultJson = new JSONObject(result);
//Extract data from JSON Response
int expiresIn = resultJson.has("expires_in") ? resultJson.getInt("expires_in") : 0;
String accessToken = resultJson.has("access_token") ? resultJson.getString("access_token") : null;
Log.e("Tokenm", ""+accessToken);
if(expiresIn>0 && accessToken!=null){
Log.i("Authorize", "This is the access Token: "+accessToken+". It will expires in "+expiresIn+" secs");
//Calculate date of expiration
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.SECOND, expiresIn);
long expireDate = calendar.getTimeInMillis();
////Store both expires in and access token in shared preferences
SharedPreferences preferences = MainActivity.this.getSharedPreferences("user_info", 0);
SharedPreferences.Editor editor = preferences.edit();
editor.putLong("expires", expireDate);
editor.putString("accessToken", accessToken);
editor.commit();
return true;
}
}
}
}catch(IOException e){
Log.e("Authorize","Error Http response "+e.getLocalizedMessage());
}
catch (ParseException e) {
Log.e("Authorize","Error Parsing Http response "+e.getLocalizedMessage());
} catch (JSONException e) {
Log.e("Authorize","Error Parsing Http response "+e.getLocalizedMessage());
}
}
return false;
}
@Override
protected void onPostExecute(Boolean status){
if(pd!=null && pd.isShowing()){
pd.dismiss();
}
if(status){
//If everything went Ok, change to another activity.
Intent startProfileActivity = new Intent(MainActivity.this, ProfileActivity.class);
MainActivity.this.startActivity(startProfileActivity);
}
}
};
【讨论】：
MainActivity：
public class MainActivity extends Activity {
/*CONSTANT FOR THE AUTHORIZATION PROCESS*/
/****FILL THIS WITH YOUR INFORMATION*********/
//This is the public api key of our application
private static final String API_KEY = "YOUR_API_KEY";
//This is the private api key of our application
private static final String SECRET_KEY = "YOUR_API_SECRET";
//This is any string we want to use. This will be used for avoiding CSRF attacks. You can generate one here: http://strongpasswordgenerator.com/
private static final String STATE = "E3ZYKC1T6H2yP4z";
//This is the url that LinkedIn Auth process will redirect to. We can put whatever we want that starts with http:// or https:// .
//We use a made up url that we will intercept when redirecting. Avoid Uppercases.
private static final String REDIRECT_URI = "http://com.amalbit.redirecturl";
/*********************************************/
//These are constants used for build the urls
private static final String AUTHORIZATION_URL = "https://www.linkedin.com/uas/oauth2/authorization";
private static final String ACCESS_TOKEN_URL = "https://www.linkedin.com/uas/oauth2/accessToken";
private static final String SECRET_KEY_PARAM = "client_secret";
private static final String RESPONSE_TYPE_PARAM = "response_type";
private static final String GRANT_TYPE_PARAM = "grant_type";
private static final String GRANT_TYPE = "authorization_code";
private static final String RESPONSE_TYPE_VALUE ="code";
private static final String CLIENT_ID_PARAM = "client_id";
private static final String STATE_PARAM = "state";
private static final String REDIRECT_URI_PARAM = "redirect_uri";
/*---------------------------------------*/
private static final String QUESTION_MARK = "?";
private static final String AMPERSAND = "&";
private static final String EQUALS = "=";
private WebView webView;
private ProgressDialog pd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//get the webView from the layout
webView = (WebView) findViewById(R.id.main_activity_web_view);
//Request focus for the webview
webView.requestFocus(View.FOCUS_DOWN);
//Show a progress dialog to the user
pd = ProgressDialog.show(this, "", this.getString(R.string.loading),true);
//Set a custom web view client
webView.setWebViewClient(new WebViewClient(){
@Override
public void onPageFinished(WebView view, String url) {
//This method will be executed each time a page finished loading.
//The only we do is dismiss the progressDialog, in case we are showing any.
if(pd!=null && pd.isShowing()){
pd.dismiss();
}
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String authorizationUrl) {
//This method will be called when the Auth proccess redirect to our RedirectUri.
//We will check the url looking for our RedirectUri.
if(authorizationUrl.startsWith(REDIRECT_URI)){
Log.i("Authorize", "");
Uri uri = Uri.parse(authorizationUrl);
//We take from the url the authorizationToken and the state token. We have to check that the state token returned by the Service is the same we sent.
//If not, that means the request may be a result of CSRF and must be rejected.
String stateToken = uri.getQueryParameter(STATE_PARAM);
if(stateToken==null || !stateToken.equals(STATE)){
Log.e("Authorize", "State token doesn't match");
return true;
}
//If the user doesn't allow authorization to our application, the authorizationToken Will be null.
String authorizationToken = uri.getQueryParameter(RESPONSE_TYPE_VALUE);
if(authorizationToken==null){
Log.i("Authorize", "The user doesn't allow authorization.");
return true;
}
Log.i("Authorize", "Auth token received: "+authorizationToken);
//Generate URL for requesting Access Token
String accessTokenUrl = getAccessTokenUrl(authorizationToken);
//We make the request in a AsyncTask
new PostRequestAsyncTask().execute(accessTokenUrl);
}else{
//Default behaviour
Log.i("Authorize","Redirecting to: "+authorizationUrl);
webView.loadUrl(authorizationUrl);
}
return true;
}
});
//Get the authorization Url
String authUrl = getAuthorizationUrl();
Log.i("Authorize","Loading Auth Url: "+authUrl);
//Load the authorization URL into the webView
webView.loadUrl(authUrl);
}
/**
* Method that generates the url for get the access token from the Service
* @return Url
*/
private static String getAccessTokenUrl(String authorizationToken){
return ACCESS_TOKEN_URL
+QUESTION_MARK
+GRANT_TYPE_PARAM+EQUALS+GRANT_TYPE
+AMPERSAND
+RESPONSE_TYPE_VALUE+EQUALS+authorizationToken
+AMPERSAND
+CLIENT_ID_PARAM+EQUALS+API_KEY
+AMPERSAND
+REDIRECT_URI_PARAM+EQUALS+REDIRECT_URI
+AMPERSAND
+SECRET_KEY_PARAM+EQUALS+SECRET_KEY;
}
/**
* Method that generates the url for get the authorization token from the Service
* @return Url
*/
private static String getAuthorizationUrl(){
return AUTHORIZATION_URL
+QUESTION_MARK+RESPONSE_TYPE_PARAM+EQUALS+RESPONSE_TYPE_VALUE
+AMPERSAND+CLIENT_ID_PARAM+EQUALS+API_KEY
+AMPERSAND+STATE_PARAM+EQUALS+STATE
+AMPERSAND+REDIRECT_URI_PARAM+EQUALS+REDIRECT_URI;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private class PostRequestAsyncTask extends AsyncTask<String, Void, Boolean>{
@Override
protected void onPreExecute(){
pd = ProgressDialog.show(MainActivity.this, "", MainActivity.this.getString(R.string.loading),true);
}
@Override
protected Boolean doInBackground(String... urls) {
if(urls.length>0){
String url = urls[0];
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpost = new HttpPost(url);
try{
HttpResponse response = httpClient.execute(httpost);
if(response!=null){
//If status is OK 200
if(response.getStatusLine().getStatusCode()==200){
String result = EntityUtils.toString(response.getEntity());
//Convert the string result to a JSON Object
JSONObject resultJson = new JSONObject(result);
//Extract data from JSON Response
int expiresIn = resultJson.has("expires_in") ? resultJson.getInt("expires_in") : 0;
String accessToken = resultJson.has("access_token") ? resultJson.getString("access_token") : null;
Log.e("Tokenm", ""+accessToken);
if(expiresIn>0 && accessToken!=null){
Log.i("Authorize", "This is the access Token: "+accessToken+". It will expires in "+expiresIn+" secs");
//Calculate date of expiration
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.SECOND, expiresIn);
long expireDate = calendar.getTimeInMillis();
////Store both expires in and access token in shared preferences
SharedPreferences preferences = MainActivity.this.getSharedPreferences("user_info", 0);
SharedPreferences.Editor editor = preferences.edit();
editor.putLong("expires", expireDate);
editor.putString("accessToken", accessToken);
editor.commit();
return true;
}
}
}
}catch(IOException e){
Log.e("Authorize","Error Http response "+e.getLocalizedMessage());
}
catch (ParseException e) {
Log.e("Authorize","Error Parsing Http response "+e.getLocalizedMessage());
} catch (JSONException e) {
Log.e("Authorize","Error Parsing Http response "+e.getLocalizedMessage());
}
}
return false;
}
@Override
protected void onPostExecute(Boolean status){
if(pd!=null && pd.isShowing()){
pd.dismiss();
}
if(status){
//If everything went Ok, change to another activity.
Intent startProfileActivity = new Intent(MainActivity.this, ProfileActivity.class);
MainActivity.this.startActivity(startProfileActivity);
}
}
};
}
还有 xmlLayout：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<WebView
android:id="@+id/main_activity_web_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
令牌保存在 sharedpreference 文件中。
简单的 android 项目 repo here in github.
【讨论】：
OAuth 2.0 比 1.0 简单得多，无需任何外部库的帮助即可完成。但是，如果您已经在使用 scribe-java，那就更简单了。
实现很简单。您需要创建一个具有自定义 WebViewClient 的 WebView，它会捕获并覆盖回调 URL 的加载行为。因此，当WebView 尝试加载该 URL 时，您可以拦截该过程并提取验证程序。可以将验证者传递给 scribe-java 以交换访问令牌。
要开始整个过程，您只需要告诉您的WebView 加载授权URL。
我有托管here 的示例代码。该应用程序使用 Buffer 的 API 进行身份验证，但大部分代码都可以重用。您可能对托管我的自定义WebView 的fragment 和获取访问令牌的背景job 感兴趣。
如有任何后续问题，请随时问我。
【讨论】：
callback_url?code="verifier"（即：nguyenhuy.me/callback?code="verifier"）。要提取验证器，您只需要通过调用Uri.getQueryParameter(String) 来获取“代码”的值。
我得到了它的工作，但它花了我一些时间。
我关注 LinkedIn Authentication 来管理它。
我仍然强烈建议您仍然阅读此链接，因为我没有涵盖示例中的所有情况（错误、错误处理、最佳实践、参数使用、精确文档......）
首先，您需要拥有 LinkedIn API 密钥和密钥。如果没有，请在 here.
其次，你需要在应用程序中有一个可以接收授权码的Activity。为此，需要在 AndroidManifest.xml 文件中将其设置为可浏览（可从浏览器启动）：
<activity
android:name=".ResultActivity"
android:label="" >
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.BROWSABLE"/>
</intent-filter>
虽然不推荐，但可以使用数据标签通过自定义方案检索 URI：
<data android:scheme="oauth"/>
之后，您需要使用特定的 URL 将用户重定向到 LinkedIn 的授权对话框：
https://www.linkedin.com/uas/oauth2/authorization?response_type=code
&client_id=YOUR_API_KEY
&scope=SCOPE
&state=STATE
&redirect_uri=YOUR_REDIRECT_URI
您可以使用 WebView 直接在您的应用程序中显示它，或者让系统通过 Intent 来处理它，例如：
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(/* FULL URL */));
startActivity(intent);
这里唯一的问题是 API 不接受 http 或 https 以外的方案，这意味着您不能只将意图 URI 作为 redirect_uri 参数传递。
所以我在我的服务器上创建了一个登录页面，唯一的目的是重定向到应用程序。我们可以想象类似（丑陋的缩短 PHP）(Intent ref.)：
header('Location: ' . "intent:#Intent;component=your.package/.ResultActivity;S.code=" . $_GET['code'] . ";S.state=" . $_GET['state'] . ";end");
die();
一切就绪！现在是 ResultActivity 的onCreate(Bundle)：
Intent intent = getIntent();
String authorizationCode = intent.getStringExtra("code");
这里还有另外一种传参方式，如果之前使用了data标签的话。
快到了！现在您只需要对该 URL 执行一个简单的 POST 请求：
https://www.linkedin.com/uas/oauth2/accessToken?grant_type=authorization_code
&code=AUTHORIZATION_CODE
&redirect_uri=YOUR_REDIRECT_URI
&client_id=YOUR_API_KEY
&client_secret=YOUR_SECRET_KEY
成功时返回JSON 对象：
{"expires_in":5184000,"access_token":"AQXdSP_W41_UPs5ioT_t8HESyODB4FqbkJ8LrV_5mff4gPODzOYR"}
等等！您现在可以使用 access_token 进行 API 调用。不要忘记在某个地方store it，这样您就不必再经历这些步骤了。
我希望这不是太长的阅读，它可以帮助一些人。 :)
【讨论】：
@Override shouldOverrideUrlLoading，如@huy.nguyen 的示例所示，甚至可以使用http://localhost 作为redirect_uri 并监听正在进行的连接。