无法使用Postman发布对reddit的评论:USER_REQUIRED错误

Question

我正试图用Postman发表评论.我发送以下信息:

头:

Authorization: "Bearer access_token"

Content-Type: " application/x-www-form-urlencoded"

User-Agent: "some u/user"

身体:

api_type: "json"

thing_id: "t3_9e04eo"

text: "some comment"

我将此POST请求发送到https://oauth.reddit.com/api/comment.

作为回报,我得到一个USER_REQUIRED error:

​

{
    "json": {
        "errors": [
            [
                "USER_REQUIRED",
                "Please log in to do that.",
                null
            ]
        ]
    }
}

这是为什么？我已经通过了access_token,它被接受为正确(否则,如果我故意传递错误的令牌,我将收到401 Unauthorized错误).

我有什么密码:

我常用的用户名:密码对

我的脚本的app_id:app_secret对

我的access_token是用来换取app_id:app_secret对的.

我也尝试用Java做这个,使用HttpURLConnection类:

import org.apache.tomcat.util.codec.binary.Base64;
import org.json.JSONArray;
import org.json.JSONObject;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Scanner;

public class RedditParser {
        public static void main(String[] args)  {
            RedditParser redditParser = new RedditParser();
            redditParser.postAComment("sds", "fdfdf");
        } 

        public  void postAComment(String postID, String commentBody)  { 

             try  { 
                 String postLink = "https://oauth.reddit.com/api/comment"; 

                  URL loginURL = new URL(postLink); 
                  HttpURLConnection connection = (HttpURLConnection) loginURL.openConnection();
                  JSONObject requestJSON = new JSONObject();
                  requestJSON.put("api_type", "json");
                  requestJSON.put("thing_id", "t3_9e04eo");
                  requestJSON.put("text", "a test comment");

                  connection.setDoOutput(true);

                  connection.setRequestProperty("Authorization", "Bearer " +getAccessToken());  //getAccessToken returns correct(!) token; it's not the cause of the error
                  connection.setRequestProperty("User-Agent", "script by /u/someuser");
                  connection.setRequestProperty("Content-Type", "application/json");

                  OutputStream os = connection.getOutputStream();
                  os.write(requestJSON.toString().getBytes("UTF-8"));
                  os.close();

                  connection.connect();

                  System.out.println("Done comment");

                  InputStream input = connection.getInputStream();
                  String inputString = new Scanner(input, "UTF-8").useDelimiter("\\Z").next();
                  JSONObject jsonObject = new JSONObject(inputString);
                  System.out.println(inputString);
            }

            catch (Exception e)  {

                 System.out.println(e);
            }

       }
}
?

但我仍然得到错误输出:

Done comment
{"jquery": [[0, 1, "refresh", []], [0, 2, "attr", "find"], [2, 3, "call", [".error.USER_REQUIRED"]], [3, 4, "attr", "show"], [4, 5, "call", []], [5, 6, "attr", "text"], [6, 7, "call", ["Please log in to do that."]], [7, 8, "attr", "end"], [8, 9, "call", []]], "success": false}

还有什么我需要添加到请求以摆脱错误？

Answer 1

根据可用信息，我猜测您没有在令牌请求中提供用户凭据，而是请求了仅应用程序令牌。由于显而易见的原因，这种类型的令牌可能无法用于在 reddit 上发表评论。

要为特定用户执行操作，您需要请求访问令牌，如下所示：

reddit@reddit-VirtualBox:~$ curl -X POST -d 'grant_type=password&username=reddit_bot&password=snoo' --user 'p-jcoLKBynTLew:gko_LXELoV07ZBNUXrvWZfzE3aI' https://www.reddit.com/api/v1/access_token
{
    "access_token": "J1qK1c18UUGJFAzz9xnH56584l4", 
    "expires_in": 3600, 
    "scope": "*", 
    "token_type": "bearer"
}

即提供用户凭据作为表单数据，并使用应用程序凭据进行基本身份验证。

一般来说，使用Reddit 已有的API 包装器之一可能更简单。对于 Java，reddit wiki 提到了JRAW和RedditJerk。