帮助使用 Facebook REST API - 使用 HttpClient (Java) 发送通知。

Question

我正在使用会话代理方法通过 Facebook Connect（通过我的 iPhone 模拟器）登录 Facebook 并获取我的会话密钥。但是，我正在使用服务器端 Java 发送通知。我想做的只是将用户到用户的通知发送回给我自己（这就是我将 to_uids 设置为空字符串的原因）。我是登录的用户。

我正在使用以下 Facebook REST API：

http://wiki.developers.facebook。 com/index.php/Notifications.send

使用 Notifcations.send REST API 调用向用户发送通知时遇到问题...

HttpClient client = new HttpClient();
String host = "http://www.facebook.com/restserver.php";
String sessionKey = "42df12eaf555bd728ef236dc-3004114647";
String notificationsCallId = Long.toString(new java.util.Date().getTime());

// Notifications.send: api_key, call_id, format, method, notification, session key, to_ids, version, 
String toNotificationsSignature = 
        "api_key="
        + "78c1c4c6a42990fbhh772f8aab96a4r4" 
        + "call_id=" + notificationsCallId
        + "format=XML" 
        + "method=Notifications.send"
        + "notification="
        + "session_key="+ sessionKey  
        + "to_ids" + ""
        + "v=1.0"
        + "0x786c388bf3cae8668c863215da0ff2";

System.out.println("to md5: " + toNotificationsSignature);

String emptyString = "";
String notificationsSignature = SimpleMd5.MD5(toNotificationsSignature);
System.out.println("md5: " + notificationsSignature);

// Parameters
NameValuePair[] notificationsSendParameters =
{ 
    new NameValuePair("api_key", "78c1c4c6a42990fbhh772f8aab96a4r4"),
    new NameValuePair("call_id", notificationsCallId),
    new NameValuePair("format", "XML"),
    new NameValuePair("method", "Notifications.send"),
    new NameValuePair("notification", ""),
    new NameValuePair("session_key", sessionKey),
    new NameValuePair("sig", notificationsSignature),
    new NameValuePair("to_ids", emptyString),
    new NameValuePair("v", "1.0") 
};

PostMethod notificationsSendPost = new PostMethod(host);

notificationsSendPost.setRequestBody(notificationsSendParameters);
notificationsSendPost.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
notificationsSendPost.setRequestHeader("User-Agent", "Facebook API PHP5 Client 1.1 (curl) 5");

// Execute method and handle any error responses.
client.executeMethod(notificationsSendPost);

// Create response
StringBuilder notificationsSendResponse = new StringBuilder();

byte[] byteArrayNotifications = new byte[4096];

for (int n; (n = notificationsSendPost.getResponseBodyAsStream().read(byteArrayNotifications)) != -1;)
{
    notificationsSendResponse.append(new String(byteArrayNotifications, 0, n));
}

String notificationInfo = notificationsSendResponse.toString();
System.out.println("Notification Info: " + notificationInfo);

19:22:06,995 INFO [STDOUT] 通知信息：

<error_response 
   xmlns="http://api.facebook.com/1.0/" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
   xsi:schemaLocation="http://api.facebook.com/1.0/ http://api.facebook.com/1.0/facebook.xsd">
   <error_code>104</error_code>
   <error_msg>Incorrect signature</error_msg>
   <request_args list="true">
     <arg>
        <key>api_key</key>
        <value>78c1c4c6a42990fbhh772f8aab96a4r4</value>
     </arg>
     <arg>
        <key>call_id</key>
        <value>1253586126742</value>
     </arg>
     <arg>
        <key>format</key>
        <value>XML</value>
     </arg>
     <arg>
        <key>method</key>
        <value>Notifications.send</value>
     </arg>
     <arg>
        <key>notification</key>
        <value/>
     </arg>
     <arg>
       <key>session_key</key>
       <value>42df12eaf555bd728ef236dc-3004114647</value>
     </arg>
     <arg>
        <key>sig</key>
        <value>325a3f78a836fe575ca77be04f66ec9d</value>
     </arg>
     <arg>
        <key>to_ids</key>
        <value/>
     </arg>
     <arg>
        <key>v</key>
        <value>1.0</value>
    </arg>
    </request_args>
</error_response>

SimpleMd5.toMD5 代码：

public class SimpleMd5 {

private static String convertToHex(byte[] data) {
    StringBuffer buf = new StringBuffer();
    for (int i = 0; i < data.length; i++) {
        int halfbyte = (data[i] >>> 4) & 0x0F;
        int two_halfs = 0;
        do {
            if ((0 <= halfbyte) && (halfbyte <= 9))
                buf.append((char) ('0' + halfbyte));
            else
                buf.append((char) ('a' + (halfbyte - 10)));
            halfbyte = data[i] & 0x0F;
        } while(two_halfs++ < 1);
    }
    return buf.toString();
}

public static String MD5(String text) 
throws NoSuchAlgorithmException, UnsupportedEncodingException  {
    MessageDigest md;
    md = MessageDigest.getInstance("MD5");
    byte[] md5hash = new byte[32];
    md.update(text.getBytes("iso-8859-1"), 0, text.length());
    md5hash = md.digest();
    return convertToHex(md5hash);
  }
}

问题(s)：(

1) 我可能做错了什么？为什么它返回 104？

(2) 我可以为通知字符串添加什么？

我知道它是 FBML 和 HTML 的精简版本，但想看一个示例。

我可以把“Hello”作为测试吗？

我知道我这样做是正确的，因为我在代码中正确调用了 Users.getInfo 和 Friends.get，它不会返回 104 错误签名。

感谢您花时间阅读本文！

Answer 1

发现了解决方案！ to_ids 后面没有=！