Facebook Connect Android - 使用stream.publish @ http://api.facebook.com/restserver.php

问题描述

我收到以下错误：

<error_code>104</error_code>
<error_msg>Incorrect signature</error_msg>

我应该将contentType类型设置为？我应该设置为：

What should I be setting contentType type as? Should I set as:

String contentType = "application/x-www-form-urlencoded";

或

String contentType = "multipart/form-data; boundary=" + kStringBoundary; 

这是我如何写流：

HttpURLConnection conn = null;
OutputStream out = null;
InputStream in = null;
try {
    conn = (HttpURLConnection) _loadingURL.openConnection();
    conn.setDoOutput(true);
    conn.setDoInput(true);
    if (method != null) {
        conn.setRequestMethod(method);
        if ("POST".equals(method)) {
            //"application/x-www-form-urlencoded";
            String contentType = "multipart/form-data; boundary=" + kStringBoundary;
            //String contentType = "application/x-www-form-urlencoded";
            conn.setRequestProperty("Content-Type", contentType);
        }

        // Cookies are used in FBPermissionDialog and FBFeedDialog to
        // retrieve logged user
       conn.connect();
       out = conn.getOutputStream();
       if ("POST".equals(method)) {
            String body = generatePostBody(postParams);
            if (body != null) {
                out.write(body.getBytes("UTF-8"));
            }
        }
        in = conn.getInputStream();

以下是我用于发布流的方法：

Here's the method I am using to publish the stream:

private void publishFeed(String themessage) {
    //Intent intent = new Intent(this, FBFeedActivity.class);
   // intent.putExtra("userMessagePrompt", themessage);
  //  intent.putExtra("attachment", 
    Map<String, String> getParams = new HashMap<String, String>();
    // getParams.put("display", "touch");
    // getParams.put("callback", "fbconnect://success");
    // getParams.put("cancel", "fbconnect://cancel");

     Map<String, String> postParams = new HashMap<String, String>();

     postParams.put("api_key", _session.getApiKey());
     postParams.put("method", "stream.publish");
     postParams.put("session_key", _session.getSessionKey());
     postParams.put("user_message", "TESTING 123");
    // postParams.put("preview", "1");
     postParams.put("attachment", "{\"name\":\"Facebook Connect for Android\",\"href\":\"http://code.google.com/p/fbconnect-android/\",\"caption\":\"Caption\",\"description\":\"Description\",\"media\":[{\"type\":\"image\",\"src\":\"http://img40.yfrog.com/img40/5914/iphoneconnectbtn.jpg\",\"href\":\"http://developers.facebook.com/connect.php?tab=iphone/\"}],\"properties\":{\"another link\":{\"text\":\"Facebook home page\",\"href\":\"http://www.facebook.com\"}}}");
    // postParams.put("user_message_prompt", "22222");


     try {
         loadURL("http://api.facebook.com/restserver.php", "POST", getParams, postParams);
     } catch (MalformedURLException e) {
         e.printStackTrace();
     }
}

这里是generatePostBody（）：

Here is generatePostBody() :

private String generatePostBody(Map<String, String> params) {
    StringBuilder body = new StringBuilder();
    StringBuilder endLine = new StringBuilder("\r\n--").append(kStringBoundary).append("\r\n");

    body.append("--").append(kStringBoundary).append("\r\n");

    for (Entry<String, String> entry : params.entrySet()) {
        body.append("Content-Disposition: form-data; name=\"").append(entry.getKey()).append("\"\r\n\r\n");
        String value = entry.getValue();
        if ("user_message_prompt".equals(entry.getKey())) {
            body.append(value);
        }
        else {
            body.append(CcUtil.encode(value));
        }

        body.append(endLine);
    }

    return body.toString();
}

谢谢。

推荐答案

这是来自 Facebook 开发人员Wiki：

This is from Facebook Developers Wiki: http://wiki.developers.facebook.com/index.php/API

仅在上传文件时使用 multipart / form-data （例如，Facebook API上的Photos.upload）

Use multipart/form-data when uploading files only (e.g. Photos.upload on Facebook API)

此外，根据此API参考资料，，这是你做错了。

Also, Based on this API reference, http://wiki.developers.facebook.com/index.php/How_Facebook_Authenticates_Your_Application, this is what you're doing wrong.

1）不要使用 HashMap 存储Facebook参数。参数必须是按照他们的键排序。而是使用 SortedMap 界面，并使用 TreeMap 来存储Facebook参数。

1) Don't use HashMap to store Facebook parameters. Parameters must be sorted by their key. Rather use SortedMap interface and use TreeMap to store Facebook parameters.

2）始终在将呼叫发送到Facebook之前的地图中包含 sig 参数。由于Facebook在您的请求中找不到 sig 参数，您将收到104错误的签名。

2) Always include the sig parameter in the map before sending the call to Facebook. You're getting a "104 Incorrect signature" because Facebook doesn't find the sig parameter in your request.

参考（）显示了如何创建一个使用Facebook的MD5签名。

The reference (http://wiki.developers.facebook.com/index.php/How_Facebook_Authenticates_Your_Application) shows exactly how to create a MD5 signature which facebook uses.

以下是如何快速创建一个 sig value for Facebook。

Here's how to quickly create a sig value for Facebook.

String hashString = "";
        Map<String, String> sortedMap = null;
        if (parameters instanceof TreeMap) {
            sortedMap = (TreeMap<String, String>) parameters; 
        } else {
            sortedMap = new TreeMap<String, String>(parameters);
        }

        try {
            Iterator<String> iter = sortedMap.keySet().iterator();
            StringBuilder sb = new StringBuilder();
            synchronized (iter) {
                while (iter.hasNext()) {
                    String key = iter.next();
                    sb.append(key);
                    sb.append("=");
                    String value = sortedMap.get(key);
                    sb.append(value == null ? "" : value);
                }
            }
            sb.append(secret);

            MessageDigest digest = MessageDigest.getInstance("MD5");
            byte[] digested = digest.digest(sb.toString().getBytes());

            BigInteger bigInt = new BigInteger(1, digested);
            hashString = bigInt.toString(16);
            while (hashString.length() < 32) {
                hashString = "0" + hashString;
            }
        } catch (NoSuchAlgorithmException nsae) {
            // TODO: handle exception
            logger.error(e.getLocalizedMessage(), e);
        }

        return hashString;

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