如何在不使用JS库的情况下使用facebook服务器端进行身份验证

时间:2013-10-25 08:28:41

标签: java facebook-graph-api facebook-opengraph

在我的网站上,用户可以使用Facebook登录。这样做时我会请求许可 发布到用户Feed。这就像一个魅力。

登录后,允许用户撰写评论,在保存评论时,系统会询问用户是否要将评论发布到Facebook上的用户Feed。由于在将评论保存在我的本地数据库中之后应该发布到facebook的帖子,我知道我需要执行身份验证服务器,然后当我有一个令牌时我能够POST到例如。

http://graph.facebook.com/10XXXX40308/feed 

message : "This works"

我一直在尝试按照here所述的方式实施facebook web登录:

步骤如下:

  1. 执行针对的请求 https://graph.facebook.com/oauth/authorize?client_id=MY_API_KEY&
    REDIRECT_URI = http://www.facebook.com/connect/login_success.html&
    范围= publish_stream
  2. Facebook会将您重定向到 http://www.facebook.com/connect/login_success.html? 代码= MY_VERIFICATION_CODE
  3. 请求 https://graph.facebook.com/oauth/access_token?client_id=MY_API_KEY& REDIRECT_URI = http://www.facebook.com/connect/login_success.html& client_secret = MY_APP_SECRET& code = MY_VERIFICATION_CODE Facebook会 使用access_token = MY_ACCESS_TOKEN
  4. 回复

    在浏览器中执行1.时,应用程序会相应地运行。我使用MY_VERIFICATION_CODE:

    从Facebook返回重定向

    success

    所以我尝试用这样的代码来做:

            String url = "https://graph.facebook.com/oauth/authorize?client_id="+clientId+"&scope=publish_stream&redirect_uri=http://www.facebook.com/connect/login_success.html";
    
            URL obj = new URL(url);
            conn = (HttpURLConnection) obj.openConnection();
            conn.setReadTimeout(5000);
            conn.setRequestMethod("GET");
    
            System.out.println("Request URL ... " + url);
    
            boolean redirect = false;
    
            // normally, 3xx is redirect
            int status = conn.getResponseCode();
            if (status != HttpURLConnection.HTTP_OK) {
                if (status == HttpURLConnection.HTTP_MOVED_TEMP
                        || status == HttpURLConnection.HTTP_MOVED_PERM
                        || status == HttpURLConnection.HTTP_SEE_OTHER)
                    redirect = true;
            }
    
            System.out.println("Response Code ... " + status);
    
            if (redirect) {
    
                // get redirect url from "location" header field
                String newUrl = conn.getHeaderField("Location");
    
                // get the cookie if need, for login
                String cookies = conn.getHeaderField("Set-Cookie");
    
                // open the new connnection again
                conn = (HttpURLConnection) new URL(newUrl).openConnection();
                conn.setRequestProperty("Cookie", cookies);                
    
                System.out.println("Redirect to URL : " + newUrl);
    
            }
    
            BufferedReader in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String inputLine;
            StringBuffer html = new StringBuffer();
    
            while ((inputLine = in.readLine()) != null) {
                html.append(inputLine);
            }
            in.close();
    
            System.out.println("URL Content... \n" + html.toString());
            System.out.println("Done");
    

    但接下来发生的事情是,我得到200回来和登录,而不是让302回来 代码页:

    enter image description here

    似乎我错过了一步或者不了解流程。

    我想要实现的是实现类似于janrain的类似调用:

    https://rpxnow.com/api/v2/facebook/stream.publish
    

    允许你这样做。

    谢谢!

1 个答案:

答案 0 :(得分:0)

我猜 rtfm 就在这里。用户需要进行身份验证,因此我真正想要做的就是绕过身份验证过程。这当然是不允许的。所以 你怎么解决这个?

当用户进行身份验证时,我需要保存访问令牌和到期时间 我可以稍后将其添加到请求中。

我认为这是唯一的方法......如果我错了,请纠正我。

因此,在身份验证过程中,我创建了一个正则表达式:

Pattern pattern = Pattern.compile("access_token=([a-zA-Z0-9]+)&expires=([0-9]+)"); 

然后在facebook的回调中,我使用regexp提取令牌:

    String accessToken = "";
    String expires = "";

    Matcher matcher = pattern.matcher(token.trim());
    if(matcher.matches()) {
        accessToken = matcher.group(1);
        expires = matcher.group(2);
    } else {
        return new JSONObject()
                .put("error", "OathBean: accessToken is null");
    }

然后我调用facebook获取用户的值并返回所有值,以便我可以使用它们:

return new JSONObject()
                .put("facebookId", facebookId)
                .put("firstName", firstName)
                .put("lastName", lastName)
                .put("email", email)
                .put("photo", photo)
                .put("accessToken", accessToken)
                .put("expires", expires);

稍后当用户想要将评论发布到Facebook时。我填写请求并发布评论。

            Map<String, String> requestData = new HashMap<String, String>();
            requestData.put("link",url(newReview));                
            requestData.put("description", "reviewText");
            requestData.put("access_token", credential.getPassword());
            String query = createQuery(requestData);
            JSONObject result = null;
            try {
                URL url = new URL("https://graph.facebook.com/"+identifier+"/feed");
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                conn.setRequestMethod("POST");
                conn.setDoOutput(true);

                conn.connect();
                OutputStreamWriter osw = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
                osw.write(query);
                osw.close();

                result =  new JSONObject(IOUtils.toString(conn.getInputStream()));
            }
            catch (Exception    e) {
                log.error("Could not call graph feed to publish for id: "+identifier, e);
            }

            if(result != null) {
                boolean success = StringUtils.isNotBlank(result.getString("id"));
                entityManager.persist(new FBPublishEvent(currentUser, newReview, success, result.toString()));                    
            }

如果您有更好的解决方案,请分享=)