使用Java中的Apache OAuth客户端2.0库生成授权代码和用户令牌的问题

Question

我试图使用Java中的Apache OAuth Client 2.0 Library自动执行用户级别令牌创建/生成过程（REST /授权授予代码）。 以下是我从https://cwiki.apache.org/confluence/display/OLTU/OAuth+2.0+Client+Quickstart获得的正在使用的代码，

`/*Previous Codes & starting the below with Try/Catch*/
OAuthClientRequest request = OAuthClientRequest
   .authorizationLocation("Authorization URL")
   .setClientId("ClientID")
   .setRedirectURI("Redirect URL")
   .buildQueryMessage();
request.getLocationUri();
OAuthAuthzResponse oar = OAuthAuthzResponse.oauthCodeAuthzResponse(request);
String code = oar.getCode();
/*Other Codes and starting the below with Try/Catch*/
OAuthClientRequest request = OAuthClientRequest
                .tokenLocation("TokenEndPointURL")
                .setGrantType(GrantType.AUTHORIZATION_CODE)
                .setClientId("ClientID")
                .setClientSecret("ClientSecret")
                .setRedirectURI("REdirectURL")
                .setCode(code)//Authorization Code from above
                .buildQueryMessage();
OAuthClient oAuthClient = new OAuthClient(new URLConnectionClient());
GitHubTokenResponse oAuthResponse = oAuthClient.accessToken(request, GitHubTokenResponse.class);
String accessToken = oAuthResponse.getAccessToken();
String expiresIn = oAuthResponse.getExpiresIn();`

但是，我在以下几行中收到了（来自Eclipse中错误的推断）编译错误，

oauthCodeAuthzResponse方法接受httpservlet对象，并且不支持OAuthAuthzReponse Type

OAuthAuthzResponse oar = OAuthAuthzResponse.oauthCodeAuthzResponse(request);

有人可以让我知道是否有解决方法吗？ 或如何将oauthCodeAuthzResponse请求转换为httpservlet请求？ 还是我做错了什么或缺少什么？

Answer 1

OAuthAuthzResponse oar = OAuthAuthzResponse.oauthCodeAuthzResponse(request);
String code = oar.getCode();

我认为上面的代码应该写在重定向URI端点的实现中，而不是在客户端代码中。

正确理解授权码流将有所帮助。 授权代码从授权服务器的授权端点发出，并将其传递到重定向URI指向的位置。 也就是说，授权代码不会直接传递到客户端应用程序。

当授权服务器发出授权代码时，它将以下所示的HTTP响应发送回客户端的Web浏览器。

HTTP/1.1 302 Found
Location: {Redirect URI}
  ?code={Authorization Code}  // - Always included
  &state={Arbitrary String}   // - Included if the authorization
                              //   request included 'state'.

302 Found触发Web浏览器转到Location标头指向的Location 。 因此，您必须实现接收授权代码的位置，并且实现必须以某种方式将授权代码传递给客户端应用程序。

还要注意，在（a）授权请求（=对授权端点的请求）和（b）令牌请求（=对令牌端点的请求）之间显示授权页面（HTML），并且该页面需要最终用户相互作用。 有关详细信息，请参见“ 所有OAuth 2.0流程的图表和影片 ”中的“ 1.授权代码流程”。

Answer 2

最终，我能够使用httpclient生成令牌-请参见下面的逻辑。

获取授权码 ：

public String getAuthCode(String authUrl, String userName, String password, String scope, String clientId, 
        String redirectUrl) throws ClientProtocolException, IOException, URISyntaxException
{
    DefaultHttpClient httpclient = new DefaultHttpClient();

    System.out.println("Adding Paramters to a Array List as NameValuePair");
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("scope", scope));
    params.add(new BasicNameValuePair("response_type", "code"));
    params.add(new BasicNameValuePair("client_id", clientId));
    params.add(new BasicNameValuePair("redirect_uri", redirectUrl));

    System.out.println("Parameters List:" + params);

    System.out.println("Building the URI with Authorization Endpoint by adding the Parameters create in Array List");
    URI uri = new URIBuilder(authUrl)
            .addParameters(params)
            .build();
    System.out.println("Built URI:" + uri);

    System.out.println("Creating HTTPGET with the Created URI");
    HttpGet get = new HttpGet(uri);
    System.out.println("HttpGet:" + get);

    System.out.println("Creating Client Context");
    HttpClientContext context = HttpClientContext.create();
    System.out.println("Created Client Context:" + context);


    System.out.println("Executing the GET Method with the created Client Context");
    HttpResponse response = httpclient.execute(get, context);
    System.out.println("HttpResponse:" + response);

    System.out.println("Getting the Final URI from the Submitted Get Method");
    URI finalUrl = get.getURI();
    System.out.println("Final URL:" + finalUrl);

    System.out.println("Creating a List of URI from the Redirection Locations using Client Context");
    List<URI> locations = context.getRedirectLocations();
    System.out.println("List of URI:" + locations);

    if (locations != null) {
        finalUrl = locations.get(locations.size() - 1);
    }
    System.out.println("Taking the last URL as Final:" + finalUrl);

    System.out.println("Creating Entity");
    EntityUtils.consume(response.getEntity());
    System.out.println("Consume the Entity:" + response.getEntity());

    String userid = "username=".concat(userName);
    System.out.println("UserID:" + userid);
    String userPassword = "Password=".concat(password);
    System.out.println("User Password:" + userPassword);
    String cred = userid+"&"+userPassword;
    System.out.println("User Credentials:" + cred);
    HttpPost postReq = new HttpPost(finalUrl);
    StringEntity entity = new StringEntity(cred);
    postReq.setEntity(entity);
    postReq.addHeader("Content-Type", "application/x-www-form-urlencoded"); 
    postReq.addHeader("User-Agent", "MSIE 8.0");


    HttpResponse responsePost = httpclient.execute(postReq,context);
    List<Header> location = Arrays.asList(responsePost.getHeaders("Location"));
    String locationUrl = location.get(0).getValue().toString();
    String[] locationArray = locationUrl.split("=");
    String authCode = locationArray[1].trim().toString();
    //System.out.println(authCode);

    EntityUtils.consume(responsePost.getEntity());
    System.out.println("Response Post Entity:"+responsePost);
    System.out.println("Authorization Code:" +authCode);
    return authCode;
}

获取令牌 ：

public List<String> getJwtToken(String clientId,String clientSecret, String authUrl,String tokenUrl,
            String redirectUrl,String accessTokenScope, String LDAPuserName,String LDAPpassword) throws Exception
    {

        List<String> tokens = new ArrayList<String>();
        //Generate the User Level Token & JWT Token using the Get/Post Method
        DefaultHttpClient httpclient = new DefaultHttpClient();


        System.out.println("Calling the get Auth Code Method");
        String authCode = getAuthCode(authUrl, LDAPuserName, LDAPpassword, accessTokenScope, clientId, redirectUrl);
        System.out.println("Authorization Code:" + authCode);

        HttpPost tokenPost = new HttpPost(tokenUrl);
        System.out.println("Token HttpPost:" + tokenPost);

        System.out.println("Adding the Parameters in an ArrayList as NameValuePair");
        List<NameValuePair> tokenParams = new ArrayList<NameValuePair>();
        tokenParams.add(new BasicNameValuePair("client_id", clientId));
        tokenParams.add(new BasicNameValuePair("client_secret", clientSecret));
        tokenParams.add(new BasicNameValuePair("code", authCode));
        tokenParams.add(new BasicNameValuePair("grant_type", "authorization_code"));
        System.out.println("Token Call Parameter:" + tokenParams);

        System.out.println("Setting the Parameters as URL Encoded Entity");
        tokenPost.setEntity(new UrlEncodedFormEntity(tokenParams));
        System.out.println("URL Encoded Entity" + tokenPost);

        System.out.println("Executing the Token Post Method");
        HttpResponse responseJWT = httpclient.execute(tokenPost);
        System.out.println("Setting the Parameters as URL Encoded Entity" + responseJWT);

        System.out.println("Parsing the ResponseJWT using JsonParser & JsonObjet");
        JsonParser parser = new JsonParser();   
        System.out.println("Json Parser:" + parser);
        JsonObject data = (JsonObject) parser.parse(new InputStreamReader(responseJWT.getEntity().getContent()));
        System.out.println("Json Object" + data);

        String token = data.get("access_token").toString();
        System.out.println("Access Token:" + token);

        String jwt="";
        try
        {
            jwt = data.get("jwt_token").toString();
            System.out.println("JWT Token:" + jwt);
        }
        catch(Exception ejwt)
        {
            System.out.println("Exception occured converting Jwt Token to String");
            ejwt.printStackTrace();
        }

        String refresh = data.get("refresh_token").toString();
        System.out.println("Refresh Token:" + refresh);

        String accessToken = token.substring(1, token.length()-1);
        tokens.add(0, accessToken);
        System.out.println("Real Access Token:" + accessToken);

        String jwtToken ="";
        try
        {
        jwtToken = jwt.substring(1, jwt.length()-1);
        tokens.add(1, jwtToken);
        System.out.println("Real JWT Token:" + jwtToken);
        }

        catch(Exception ejwt)
        {
            System.out.println("Exception occured adding Jwt Token to String List");
            ejwt.printStackTrace();
        }

        String refreshToken = refresh.substring(1, refresh.length()-1);
        System.out.println("Real Refresh Token:" + refreshToken);

        return tokens;

    }

Answer 3

我已经使用了这种验证码方法。 制作验证码时出现此错误

> location->[] 
[ERROR] 2018-10-12 14:16:59.414 [http-nio-8080-exec-3]
> [dispatcherServlet] - Servlet.service() for servlet
> [dispatcherServlet] in context with path [] threw exception [Request
> processing failed; nested exception is
> java.lang.ArrayIndexOutOfBoundsException: 0] with root cause
> java.lang.ArrayIndexOutOfBoundsException: 0