/*
* Copyright (C) 2008 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.google.android.net;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.net.http.AndroidHttpClient;
import android.os.Build;
import android.os.NetStat;
import android.os.SystemClock;
import android.provider.Checkin;
import android.util.Config;
import android.util.Log;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.ProtocolException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.impl.client.EntityEnclosingRequestWrapper;
import org.apache.http.impl.client.RequestWrapper;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HttpContext;
import org.apache.harmony.xnet.provider.jsse.SSLClientSessionCache;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
/**
* {@link AndroidHttpClient} wrapper that uses {@link UrlRules} to rewrite URLs
* and otherwise tweak HTTP requests.
*/
public class GoogleHttpClient implements HttpClient {
private static final String TAG = "GoogleHttpClient";
/** Exception thrown when a request is blocked by the URL rules. */
public static class BlockedRequestException extends IOException {
private final UrlRules.Rule mRule;
BlockedRequestException(UrlRules.Rule rule) {
super("Blocked by rule: " + rule.mName);
mRule = rule;
}
}
private final AndroidHttpClient mClient;
private final ContentResolver mResolver;
private final String mUserAgent;
/**
* Create an HTTP client. Normally one client is shared throughout an app.
* @param resolver to use for accessing URL rewriting rules.
* @param userAgent to report in your HTTP requests.
* @deprecated Use {@link #GoogleHttpClient(android.content.ContentResolver, String, boolean)}
*/
public GoogleHttpClient(ContentResolver resolver, String userAgent) {
mClient = AndroidHttpClient.newInstance(userAgent);
mResolver = resolver;
mUserAgent = userAgent;
}
/**
* GoogleHttpClient(Context, String, boolean) - without SSL session
* persistence.
*
* @deprecated use Context instead of ContentResolver.
*/
public GoogleHttpClient(ContentResolver resolver, String appAndVersion,
boolean gzipCapable) {
this(resolver, null /* cache */, appAndVersion, gzipCapable);
}
/**
* Create an HTTP client. Normaly this client is shared throughout an app.
* The HTTP client will construct its User-Agent as follows:
*
* <appAndVersion> (<build device> <build id>)
* or
* <appAndVersion> (<build device> <build id>); gzip
* (if gzip capable)
*
* The context has settings for URL rewriting rules and is used to enable
* SSL session persistence.
*
* @param context application context.
* @param appAndVersion Base app and version to use in the User-Agent.
* e.g., "MyApp/1.0"
* @param gzipCapable Whether or not this client is able to consume gzip'd
* responses. Only used to modify the User-Agent, not other request
* headers. Needed because Google servers require gzip in the User-Agent
* in order to return gzip'd content.
*/
public GoogleHttpClient(Context context, String appAndVersion,
boolean gzipCapable) {
this(context.getContentResolver(), SSLClientSessionCacheFactory.getCache(context),
appAndVersion, gzipCapable);
}
private GoogleHttpClient(ContentResolver resolver, SSLClientSessionCache cache,
String appAndVersion, boolean gzipCapable) {
String userAgent = appAndVersion + " (" + Build.DEVICE + " " + Build.ID + ")";
if (gzipCapable) {
userAgent = userAgent + "; gzip";
}
mClient = AndroidHttpClient.newInstance(userAgent, cache);
mResolver = resolver;
mUserAgent = userAgent;
}
/**
* Release resources associated with this client. You must call this,
* or significant resources (sockets and memory) may be leaked.
*/
public void close() {
mClient.close();
}
/** Execute a request without applying and rewrite rules. */
public HttpResponse executeWithoutRewriting(
HttpUriRequest request, HttpContext context)
throws IOException {
String code = "Error";
long start = SystemClock.elapsedRealtime();
try {
HttpResponse response;
// TODO: if we're logging network stats, and if the apache library is configured
// to follow redirects, count each redirect as an additional round trip.
// see if we're logging network stats.
boolean logNetworkStats = NetworkStatsEntity.shouldLogNetworkStats();
if (logNetworkStats) {
int uid = android.os.Process.myUid();
long startTx = NetStat.getUidTxBytes(uid);
long startRx = NetStat.getUidRxBytes(uid);
response = mClient.execute(request, context);
code = Integer.toString(response.getStatusLine().getStatusCode());
HttpEntity origEntity = response == null ? null : response.getEntity();
if (origEntity != null) {
// yeah, we compute the same thing below. we do need to compute this here
// so we can wrap the HttpEntity in the response.
long now = SystemClock.elapsedRealtime();
long elapsed = now - start;
NetworkStatsEntity entity = new NetworkStatsEntity(origEntity,
mUserAgent, uid, startTx, startRx,
elapsed /* response latency */, now /* processing start time */);
response.setEntity(entity);
}
} else {
response = mClient.execute(request, context);
code = Integer.toString(response.getStatusLine().getStatusCode());
}
return response;
} catch (IOException e) {
code = "IOException";
throw e;
} finally {
// Record some statistics to the checkin service about the outcome.
// Note that this is only describing execute(), not body download.
try {
long elapsed = SystemClock.elapsedRealtime() - start;
ContentValues values = new ContentValues();
values.put(Checkin.Stats.TAG,
Checkin.Stats.Tag.HTTP_STATUS + ":" +
mUserAgent + ":" + code);
values.put(Checkin.Stats.COUNT, 1);
values.put(Checkin.Stats.SUM, elapsed / 1000.0);
mResolver.insert(Checkin.Stats.CONTENT_URI, values);
} catch (Exception e) {
Log.e(TAG, "Error recording stats", e);
}
}
}
public HttpResponse execute(HttpUriRequest request, HttpContext context)
throws IOException {
// Rewrite the supplied URL...
URI uri = request.getURI();
String original = uri.toString();
UrlRules rules = UrlRules.getRules(mResolver);
UrlRules.Rule rule = rules.matchRule(original);
String rewritten = rule.apply(original);
if (rewritten == null) {
Log.w(TAG, "Blocked by " + rule.mName + ": " + original);
throw new BlockedRequestException(rule);
} else if (rewritten == original) {
return executeWithoutRewriting(request, context); // Pass through
}
try {
uri = new URI(rewritten);
} catch (URISyntaxException e) {
throw new RuntimeException("Bad URL from rule: " + rule.mName, e);
}
// Wrap request so we can replace the URI.
RequestWrapper wrapper = wrapRequest(request);
wrapper.setURI(uri);
request = wrapper;
if (Config.LOGV) {
Log.v(TAG, "Rule " + rule.mName + ": " + original + " -> " + rewritten);
}
return executeWithoutRewriting(request, context);
}
/**
* Wraps the request making it mutable.
*/
private static RequestWrapper wrapRequest(HttpUriRequest request)
throws IOException {
try {
// We have to wrap it with the right type. Some code performs
// instanceof checks.
RequestWrapper wrapped;
if (request instanceof HttpEntityEnclosingRequest) {
wrapped = new EntityEnclosingRequestWrapper(
(HttpEntityEnclosingRequest) request);
} else {
wrapped = new RequestWrapper(request);
}
// Copy the headers from the original request into the wrapper.
wrapped.resetHeaders();
return wrapped;
} catch (ProtocolException e) {
throw new ClientProtocolException(e);
}
}
/**
* Mark a user agent as one Google will trust to handle gzipped content.
* {@link AndroidHttpClient#modifyRequestToAcceptGzipResponse} is (also)
* necessary but not sufficient -- many browsers claim to accept gzip but
* have broken handling, so Google checks the user agent as well.
*
* @param originalUserAgent to modify (however you identify yourself)
* @return user agent with a "yes, I really can handle gzip" token added.
* @deprecated Use {@link #GoogleHttpClient(android.content.ContentResolver, String, boolean)}
*/
public static String getGzipCapableUserAgent(String originalUserAgent) {
return originalUserAgent + "; gzip";
}
// HttpClient wrapper methods.
public HttpParams getParams() {
return mClient.getParams();
}
public ClientConnectionManager getConnectionManager() {
return mClient.getConnectionManager();
}
public HttpResponse execute(HttpUriRequest request) throws IOException {
return execute(request, (HttpContext) null);
}
public HttpResponse execute(HttpHost target, HttpRequest request)
throws IOException {
return mClient.execute(target, request);
}
public HttpResponse execute(HttpHost target, HttpRequest request,
HttpContext context) throws IOException {
return mClient.execute(target, request, context);
}
public <T> T execute(HttpUriRequest request,
ResponseHandler<? extends T> responseHandler)
throws IOException, ClientProtocolException {
return mClient.execute(request, responseHandler);
}
public <T> T execute(HttpUriRequest request,
ResponseHandler<? extends T> responseHandler, HttpContext context)
throws IOException, ClientProtocolException {
return mClient.execute(request, responseHandler, context);
}
public <T> T execute(HttpHost target, HttpRequest request,
ResponseHandler<? extends T> responseHandler) throws IOException,
ClientProtocolException {
return mClient.execute(target, request, responseHandler);
}
public <T> T execute(HttpHost target, HttpRequest request,
ResponseHandler<? extends T> responseHandler, HttpContext context)
throws IOException, ClientProtocolException {
return mClient.execute(target, request, responseHandler, context);
}
/**
* Enables cURL request logging for this client.
*
* @param name to log messages with
* @param level at which to log messages (see {@link android.util.Log})
*/
public void enableCurlLogging(String name, int level) {
mClient.enableCurlLogging(name, level);
}
/**
* Disables cURL logging for this client.
*/
public void disableCurlLogging() {
mClient.disableCurlLogging();
}
}
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