MockIAMCredentialsServiceTransport.java

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package com.google.auth.oauth2;

import java.io.IOException;
import java.util.List;

import com.google.api.client.http.LowLevelHttpRequest;
import com.google.api.client.http.LowLevelHttpResponse;
import com.google.api.client.http.HttpStatusCodes;
import com.google.api.client.json.GenericJson;
import com.google.api.client.json.Json;
import com.google.api.client.testing.http.MockHttpTransport;
import com.google.api.client.testing.http.MockLowLevelHttpRequest;
import com.google.api.client.testing.http.MockLowLevelHttpResponse;
import com.google.common.io.BaseEncoding;

import com.google.auth.TestUtils;
/**
 * Transport that simulates the IAMCredentials server for access tokens.
 */
public class MockIAMCredentialsServiceTransport extends MockHttpTransport {

  private static final String IAM_ACCESS_TOKEN_ENDPOINT = "https://iamcredentials.googleapis.com/v1/projects/-/serviceAccounts/%s:generateAccessToken";
  private static final String IAM_ID_TOKEN_ENDPOINT = "https://iamcredentials.googleapis.com/v1/projects/-/serviceAccounts/%s:generateIdToken";
  private static final String IAM_SIGN_ENDPOINT = "https://iamcredentials.googleapis.com/v1/projects/-/serviceAccounts/%s:signBlob";
  private Integer tokenResponseErrorCode;
  private String tokenResponseErrorContent;
  private String targetPrincipal;
  private byte[] signedBlob;
  private int responseCode = HttpStatusCodes.STATUS_CODE_OK;
  private String errorMessage;

  private String accessToken;
  private String expireTime;

  public MockIAMCredentialsServiceTransport() {
  }

  public void setTokenResponseErrorCode(Integer tokenResponseErrorCode) {
    this.tokenResponseErrorCode = tokenResponseErrorCode;
  }

  public void setTokenResponseErrorContent(String tokenResponseErrorContent) {
    this.tokenResponseErrorContent = tokenResponseErrorContent;
  }

  public void setTargetPrincipal(String targetPrincipal) {
    this.targetPrincipal = targetPrincipal;
  }

  public void setAccessToken(String accessToken) {
    this.accessToken = accessToken;
  }

  public void setexpireTime(String expireTime) {
    this.expireTime = expireTime;
  }

  public void setSignedBlob(byte[] signedBlob) {
    this.signedBlob = signedBlob;
  }

  public void setSigningErrorResponseCodeAndMessage(int responseCode, String errorMessage) {
    this.responseCode = responseCode;
    this.errorMessage = errorMessage;
  }

  @Override
  public LowLevelHttpRequest buildRequest(String method, String url) throws IOException {

    String iamAccesssTokenformattedUrl = String.format(IAM_ACCESS_TOKEN_ENDPOINT, this.targetPrincipal);
    String iamSignBlobformattedUrl = String.format(IAM_SIGN_ENDPOINT, this.targetPrincipal);
    if (url.equals(iamAccesssTokenformattedUrl)) {
      return new MockLowLevelHttpRequest(url) {
        @Override
        public LowLevelHttpResponse execute() throws IOException {

          if (tokenResponseErrorCode != null) {
            return new MockLowLevelHttpResponse()
                .setStatusCode(tokenResponseErrorCode)
                .setContentType(Json.MEDIA_TYPE)
                .setContent(tokenResponseErrorContent);
          }

          // Create the JSON response
          GenericJson refreshContents = new GenericJson();
          refreshContents.setFactory(OAuth2Utils.JSON_FACTORY);
          refreshContents.put("accessToken", accessToken);
          refreshContents.put("expireTime", expireTime);
          String refreshText = refreshContents.toPrettyString();
          return new MockLowLevelHttpResponse()
              .setContentType(Json.MEDIA_TYPE)
              .setContent(refreshText);
        }
      };
    } else if (url.equals(iamSignBlobformattedUrl) && responseCode != HttpStatusCodes.STATUS_CODE_OK) {
      return new MockLowLevelHttpRequest(url) {
        @Override
        public LowLevelHttpResponse execute() throws IOException {

          if (tokenResponseErrorCode != null) {
            return new MockLowLevelHttpResponse()
                .setStatusCode(tokenResponseErrorCode)
                .setContentType(Json.MEDIA_TYPE)
                .setContent(tokenResponseErrorContent);
          }

          BaseEncoding base64 = BaseEncoding.base64();
          GenericJson refreshContents = new GenericJson();
          refreshContents.setFactory(OAuth2Utils.JSON_FACTORY);
          refreshContents.put("signedBlob", base64.encode(signedBlob));
          String refreshText = refreshContents.toPrettyString();
          return new MockLowLevelHttpResponse()
          .setStatusCode(responseCode)
          .setContent(TestUtils.errorJson(errorMessage));
        }
      };
    } else if (url.equals(iamSignBlobformattedUrl)) {
      return new MockLowLevelHttpRequest(url) {
        @Override
        public LowLevelHttpResponse execute() throws IOException {

          if (tokenResponseErrorCode != null) {
            return new MockLowLevelHttpResponse()
                .setStatusCode(tokenResponseErrorCode)
                .setContentType(Json.MEDIA_TYPE)
                .setContent(tokenResponseErrorContent);
          }

          BaseEncoding base64 = BaseEncoding.base64();
          GenericJson refreshContents = new GenericJson();
          refreshContents.setFactory(OAuth2Utils.JSON_FACTORY);
          refreshContents.put("signedBlob", base64.encode(signedBlob));
          String refreshText = refreshContents.toPrettyString();
          return new MockLowLevelHttpResponse()
              .setContentType(Json.MEDIA_TYPE)
              .setContent(refreshText);
        }
      };
    }

    return super.buildRequest(method, url);
  }

}