Sources.java

import javax.net.ssl.HttpsURLConnection;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;

import sun.misc.BASE64Encoder;

public class Sources {

  private static final String URL_STRING = "https://api.heroku.com/sources";

  private URL url;

  public static void main(String[] args) throws Exception {
    new Sources("").post();
  }

  public Sources(String rawApiKey) throws IOException {
    this.url = new URL(URL_STRING);
  }

  public void post() throws Exception {
    HttpsURLConnection con = (HttpsURLConnection) this.url.openConnection();

    con.setRequestMethod("POST");

    con.setRequestProperty("Authorization", encodeApiKey());
    con.setRequestProperty("Content-Type", "application/json");
    con.setRequestProperty("Accept", "application/vnd.heroku+json; version=3");

    con.setDoOutput(true);

    System.out.println("responseCode=" + con.getResponseCode() );
    System.out.println("requestMethod=" + con.getRequestMethod());
    System.out.println("cipherSuite=" + con.getCipherSuite());

    String[] headers = new String[]{
        "Request-Id", "Content-Length", "Content-Type", "Ratelimit-Multiplier", "Ratelimit-Remaining"
    };
    for (String headerName : headers) {
      System.out.println(headerName + ": " + con.getHeaderField(headerName));
    }

    BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
    String inputLine;
    StringBuilder response = new StringBuilder();
    while ((inputLine = in.readLine()) != null) {
      response.append(inputLine);
    }
    in.close();
    System.out.println("response=" + response );
  }

  private String encodeApiKey() throws IOException {
    String apiKey = System.getenv("HEROKU_API_KEY");
    if (null == apiKey || apiKey.equals("")) {
      System.out.println("apiKeySource=CLI");
      ProcessBuilder pb = new ProcessBuilder().command("heroku", "auth:token");
      Process p = pb.start();

      BufferedReader bri = new BufferedReader(new InputStreamReader(p.getInputStream()));
      String line;
      StringBuilder rawApiKey = new StringBuilder();
      while ((line = bri.readLine()) != null) {
        rawApiKey.append(line);
      }
      apiKey = rawApiKey.toString();
    } else {
      System.out.println("apiKeySource=HEROKU_API_KEY");
    }
    return new BASE64Encoder().encode((":" + apiKey).getBytes());
  }
}