如何实现客户端凭据流（2 腿 OAuth）以连接到 LinkedIn API？

Question

1. 当我尝试official page 或other example 时。

2. 我明白了

   {"error":"access_denied","error_description":"该应用不允许创建应用令牌"}

3. 我在下面添加了代码，但没有获得访问令牌。这表明应用程序不允许创建应用程序令牌。

{
  String urlParameters = "grant_type=client_credentials&client_id="+linkedInClientId+"&client_secret="+linkedInClientSecret;
  String urlParametersEncoded = "";

  try {
    urlParametersEncoded = URLEncoder.encode(urlParameters, "UTF-8");
  } catch (Exception e) {
    System.out.println("URL Encode error.." + e);
  }

  String url = "https://www.linkedin.com/oauth/v2/accessToken?" + urlParametersEncoded;
  String access_token = "null";
  try {
    URL obj = new URL(url);
    HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();

    //add reuqest header
    con.setRequestMethod("POST");
    con.setRequestProperty("Host", "www.linkedin.com");
    con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

    // Send post request
    con.setDoOutput(true);
    DataOutputStream wr = new DataOutputStream(con.getOutputStream());
    wr.writeBytes(urlParameters);
    wr.flush();
    wr.close();

    int responseCode = con.getResponseCode();
    System.out.println("\nSending 'POST' request to URL : " + url);
    System.out.println("Post parameters : " + urlParameters);
    System.out.println("Response Code : " + responseCode);

    BufferedReader in = new BufferedReader(
      new InputStreamReader(con.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
      response.append(inputLine);
    }
              in.close();

    //print result
    //System.out.println(response.toString());

    JSONObject jsonObj = new JSONObject(response.toString());
    access_token = jsonObj.getString("access_token");
    System.out.println("!!!!!!!!!!!" + access_token);
  } catch (Exception e) {
    System.out.println("error token.." + e);
  }

  return access_token;
}

Answer 1

两条腿的流程 - 不是特定于成员，但需要某种形式的批准

所有两条腿的流都需要伙伴关系/扩展访问权限 (https://developer.linkedin.com/partner-programs)

详细了解 LinkedIn Developer Enterprise 产品以请求客户凭据流的权限。

三足流 - 会员专属

三足流不像两足流那样需要任何扩展访问，最好使用三足流代替（推荐）。

请按照三足流的步骤操作，它对我有用，

在浏览器中访问它

https://www.linkedin.com/oauth/v2/authorization?response_type=code&client_id=81101e5urkn5nv&redirect_uri=https://localhost:8080/auth/callback&state=aRandomString&scope=r_emailaddress