/*
* Copyright (c) 2014 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.api.client.googleapis.auth.oauth2;
import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpHeaders;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpResponse;
import com.google.api.client.http.HttpTransport;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Collection;
/**
* Utilities used by the com.google.api.client.googleapis.auth.oauth2 namespace.
*
*/
class OAuth2Utils {
static final Charset UTF_8 = Charset.forName("UTF-8");
private static final String METADATA_SERVER_URL = "http://metadata.google.internal";
static <T extends Throwable> T exceptionWithCause(T exception, Throwable cause) {
exception.initCause(cause);
return exception;
}
static boolean headersContainValue(HttpHeaders headers, String headerName, String value) {
Object values = headers.get(headerName);
if (values instanceof Collection) {
@SuppressWarnings("unchecked")
Collection<Object> valuesList = (Collection<Object>) values;
for (Object headerValue : valuesList) {
if (headerValue instanceof String && ((String) headerValue).equals(value)) {
return true;
}
}
}
return false;
}
static boolean runningOnComputeEngine(HttpTransport transport) {
try {
GenericUrl tokenUrl = new GenericUrl(METADATA_SERVER_URL);
HttpRequest request = transport.createRequestFactory().buildGetRequest(tokenUrl);
HttpResponse response = request.execute();
HttpHeaders headers = response.getHeaders();
if (headersContainValue(headers, "Metadata-Flavor", "Google")) {
return true;
}
} catch (IOException expected) {
}
return false;
}
private OAuth2Utils() {
}
}