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/*
* Copyright (C) 2016 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 org.mozilla.thirdparty.com.google.android.exoplayer2.drm;
import android.annotation.TargetApi;
import android.net.Uri;
import android.text.TextUtils;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.drm.ExoMediaDrm.KeyRequest;
import org.mozilla.thirdparty.com.google.android.exoplayer2.drm.ExoMediaDrm.ProvisionRequest;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.DataSourceInputStream;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.DataSpec;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.HttpDataSource;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.HttpDataSource.InvalidResponseCodeException;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
/**
* A {@link MediaDrmCallback} that makes requests using {@link HttpDataSource} instances.
*/
@TargetApi(18)
public final class HttpMediaDrmCallback implements MediaDrmCallback {
private static final int MAX_MANUAL_REDIRECTS = 5;
private final HttpDataSource.Factory dataSourceFactory;
private final String defaultLicenseUrl;
private final boolean forceDefaultLicenseUrl;
private final Map<String, String> keyRequestProperties;
/**
* @param defaultLicenseUrl The default license URL. Used for key requests that do not specify
* their own license URL.
* @param dataSourceFactory A factory from which to obtain {@link HttpDataSource} instances.
*/
public HttpMediaDrmCallback(String defaultLicenseUrl, HttpDataSource.Factory dataSourceFactory) {
this(defaultLicenseUrl, false, dataSourceFactory);
}
/**
* @param defaultLicenseUrl The default license URL. Used for key requests that do not specify
* their own license URL, or for all key requests if {@code forceDefaultLicenseUrl} is
* set to true.
* @param forceDefaultLicenseUrl Whether to use {@code defaultLicenseUrl} for key requests that
* include their own license URL.
* @param dataSourceFactory A factory from which to obtain {@link HttpDataSource} instances.
*/
public HttpMediaDrmCallback(String defaultLicenseUrl, boolean forceDefaultLicenseUrl,
HttpDataSource.Factory dataSourceFactory) {
this.dataSourceFactory = dataSourceFactory;
this.defaultLicenseUrl = defaultLicenseUrl;
this.forceDefaultLicenseUrl = forceDefaultLicenseUrl;
this.keyRequestProperties = new HashMap<>();
}
/**
* Sets a header for key requests made by the callback.
*
* @param name The name of the header field.
* @param value The value of the field.
*/
public void setKeyRequestProperty(String name, String value) {
Assertions.checkNotNull(name);
Assertions.checkNotNull(value);
synchronized (keyRequestProperties) {
keyRequestProperties.put(name, value);
}
}
/**
* Clears a header for key requests made by the callback.
*
* @param name The name of the header field.
*/
public void clearKeyRequestProperty(String name) {
Assertions.checkNotNull(name);
synchronized (keyRequestProperties) {
keyRequestProperties.remove(name);
}
}
/**
* Clears all headers for key requests made by the callback.
*/
public void clearAllKeyRequestProperties() {
synchronized (keyRequestProperties) {
keyRequestProperties.clear();
}
}
@Override
public byte[] executeProvisionRequest(UUID uuid, ProvisionRequest request) throws IOException {
String url =
request.getDefaultUrl() + "&signedRequest=" + Util.fromUtf8Bytes(request.getData());
return executePost(dataSourceFactory, url, /* httpBody= */ null, /* requestProperties= */ null);
}
@Override
public byte[] executeKeyRequest(UUID uuid, KeyRequest request) throws Exception {
String url = request.getLicenseServerUrl();
if (forceDefaultLicenseUrl || TextUtils.isEmpty(url)) {
url = defaultLicenseUrl;
}
Map<String, String> requestProperties = new HashMap<>();
// Add standard request properties for supported schemes.
String contentType = C.PLAYREADY_UUID.equals(uuid) ? "text/xml"
: (C.CLEARKEY_UUID.equals(uuid) ? "application/json" : "application/octet-stream");
requestProperties.put("Content-Type", contentType);
if (C.PLAYREADY_UUID.equals(uuid)) {
requestProperties.put("SOAPAction",
"http://schemas.microsoft.com/DRM/2007/03/protocols/AcquireLicense");
}
// Add additional request properties.
synchronized (keyRequestProperties) {
requestProperties.putAll(keyRequestProperties);
}
return executePost(dataSourceFactory, url, request.getData(), requestProperties);
}
private static byte[] executePost(
HttpDataSource.Factory dataSourceFactory,
String url,
@Nullable byte[] httpBody,
@Nullable Map<String, String> requestProperties)
throws IOException {
HttpDataSource dataSource = dataSourceFactory.createDataSource();
if (requestProperties != null) {
for (Map.Entry<String, String> requestProperty : requestProperties.entrySet()) {
dataSource.setRequestProperty(requestProperty.getKey(), requestProperty.getValue());
}
}
int manualRedirectCount = 0;
while (true) {
DataSpec dataSpec =
new DataSpec(
Uri.parse(url),
DataSpec.HTTP_METHOD_POST,
httpBody,
/* absoluteStreamPosition= */ 0,
/* position= */ 0,
/* length= */ C.LENGTH_UNSET,
/* key= */ null,
DataSpec.FLAG_ALLOW_GZIP);
DataSourceInputStream inputStream = new DataSourceInputStream(dataSource, dataSpec);
try {
return Util.toByteArray(inputStream);
} catch (InvalidResponseCodeException e) {
// For POST requests, the underlying network stack will not normally follow 307 or 308
// redirects automatically. Do so manually here.
boolean manuallyRedirect =
(e.responseCode == 307 || e.responseCode == 308)
&& manualRedirectCount++ < MAX_MANUAL_REDIRECTS;
String redirectUrl = manuallyRedirect ? getRedirectUrl(e) : null;
if (redirectUrl == null) {
throw e;
}
url = redirectUrl;
} finally {
Util.closeQuietly(inputStream);
}
}
}
private static @Nullable String getRedirectUrl(InvalidResponseCodeException exception) {
Map<String, List<String>> headerFields = exception.headerFields;
if (headerFields != null) {
List<String> locationHeaders = headerFields.get("Location");
if (locationHeaders != null && !locationHeaders.isEmpty()) {
return locationHeaders.get(0);
}
}
return null;
}
}
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