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/*
* Copyright (C) 2022 The Android Open Source Project
*
* 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.android.adservices.service.measurement;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.android.adservices.LogUtil;
import com.android.adservices.service.Flags;
import com.android.adservices.service.FlagsFactory;
import com.google.common.base.Charsets;
import org.json.JSONObject;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
/**
* Utility class related to network related activities
*
* @hide
*/
public class MeasurementHttpClient {
enum HttpMethod {
GET,
POST
}
/**
* Opens a {@link URLConnection} and sets the network connection & read timeout. The timeout
* values are configurable using the name "measurement_network_connect_timeout_ms" and
* "measurement_network_read_timeout_ms"
*/
@NonNull
public URLConnection setup(@NonNull URL url) throws IOException {
Objects.requireNonNull(url);
final URLConnection urlConnection = url.openConnection();
final Flags flags = FlagsFactory.getFlags();
urlConnection.setConnectTimeout(flags.getMeasurementNetworkConnectTimeoutMs());
urlConnection.setReadTimeout(flags.getMeasurementNetworkReadTimeoutMs());
// Overriding default headers to avoid leaking information
urlConnection.setRequestProperty("User-Agent", "");
return urlConnection;
}
/**
* Rest call execution, if an error is encountered before performing the network call or an
* {@link IOException} is thrown, an empty {@link Optional} will be returned.
*/
@NonNull
public Optional<MeasurementHttpResponse> call(
@NonNull String endpoint,
@NonNull HttpMethod httpMethod,
@Nullable Map<String, String> headers,
@Nullable JSONObject payload,
boolean followRedirects) {
if (endpoint == null || httpMethod == null) {
LogUtil.d("Endpoint or http method is empty");
return Optional.empty();
}
final URL url;
try {
url = new URL(endpoint);
} catch (MalformedURLException e) {
LogUtil.e(e, "Malformed registration target URL");
return Optional.empty();
}
final HttpURLConnection urlConnection;
try {
urlConnection = (HttpURLConnection) setup(url);
} catch (IOException e) {
LogUtil.e(e, "Failed to open target URL");
return Optional.empty();
}
try {
urlConnection.setRequestMethod(httpMethod.name());
if (headers != null && !headers.isEmpty()) {
for (Map.Entry<String, String> entry : headers.entrySet()) {
urlConnection.setRequestProperty(entry.getKey(), entry.getValue());
}
}
if (payload != null) {
urlConnection.setDoOutput(true);
try (BufferedOutputStream out =
new BufferedOutputStream(urlConnection.getOutputStream())) {
out.write(payload.toString().getBytes());
out.flush();
}
}
urlConnection.setInstanceFollowRedirects(followRedirects);
int responseCode = urlConnection.getResponseCode();
if (responseCode / 100 == 2) {
return Optional.of(
new MeasurementHttpResponse.Builder()
.setPayload(convert(urlConnection.getInputStream()))
.setHeaders(urlConnection.getHeaderFields())
.setStatusCode(responseCode)
.build());
} else {
return Optional.of(
new MeasurementHttpResponse.Builder()
.setPayload(convert(urlConnection.getErrorStream()))
.setHeaders(urlConnection.getHeaderFields())
.setStatusCode(responseCode)
.build());
}
} catch (IOException e) {
LogUtil.e(e, "Failed to get registration response");
return Optional.empty();
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
}
}
private String convert(@NonNull InputStream in) throws IOException {
if (in == null) {
return null;
}
return new String(in.readAllBytes(), Charsets.UTF_8);
}
}
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