// Copyright 2007 The Android Open Source Project
package com.google.android.gdata.client;
import com.google.android.net.GoogleHttpClient;
import com.google.wireless.gdata.client.GDataClient;
import com.google.wireless.gdata.client.HttpException;
import com.google.wireless.gdata.client.QueryParams;
import com.google.wireless.gdata.data.StringUtils;
import com.google.wireless.gdata.parser.ParseException;
import com.google.wireless.gdata.serializer.GDataSerializer;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.InputStreamEntity;
import org.apache.http.entity.AbstractHttpEntity;
import android.content.ContentResolver;
import android.content.Context;
import android.net.http.AndroidHttpClient;
import android.text.TextUtils;
import android.util.Config;
import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.io.BufferedInputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLEncoder;
/**
* Implementation of a GDataClient using GoogleHttpClient to make HTTP
* requests. Always issues GETs and POSTs, using the X-HTTP-Method-Override
* header when a PUT or DELETE is desired, to avoid issues with firewalls, etc.,
* that do not allow methods other than GET or POST.
*/
public class AndroidGDataClient implements GDataClient {
private static final String TAG = "GDataClient";
private static final boolean DEBUG = false;
private static final boolean LOCAL_LOGV = DEBUG ? Config.LOGD : Config.LOGV;
private static final String X_HTTP_METHOD_OVERRIDE =
"X-HTTP-Method-Override";
private static final String DEFAULT_USER_AGENT_APP_VERSION = "Android-GData/1.1";
private static final int MAX_REDIRECTS = 10;
private final GoogleHttpClient mHttpClient;
private ContentResolver mResolver;
/**
* Interface for creating HTTP requests. Used by
* {@link AndroidGDataClient#createAndExecuteMethod}, since HttpUriRequest does not allow for
* changing the URI after creation, e.g., when you want to follow a redirect.
*/
private interface HttpRequestCreator {
HttpUriRequest createRequest(URI uri);
}
private static class GetRequestCreator implements HttpRequestCreator {
public GetRequestCreator() {
}
public HttpUriRequest createRequest(URI uri) {
HttpGet get = new HttpGet(uri);
return get;
}
}
private static class PostRequestCreator implements HttpRequestCreator {
private final String mMethodOverride;
private final HttpEntity mEntity;
public PostRequestCreator(String methodOverride, HttpEntity entity) {
mMethodOverride = methodOverride;
mEntity = entity;
}
public HttpUriRequest createRequest(URI uri) {
HttpPost post = new HttpPost(uri);
if (mMethodOverride != null) {
post.addHeader(X_HTTP_METHOD_OVERRIDE, mMethodOverride);
}
post.setEntity(mEntity);
return post;
}
}
// MAJOR TODO: make this work across redirects (if we can reset the InputStream).
// OR, read the bits into a local buffer (yuck, the media could be large).
private static class MediaPutRequestCreator implements HttpRequestCreator {
private final InputStream mMediaInputStream;
private final String mContentType;
public MediaPutRequestCreator(InputStream mediaInputStream, String contentType) {
mMediaInputStream = mediaInputStream;
mContentType = contentType;
}
public HttpUriRequest createRequest(URI uri) {
HttpPost post = new HttpPost(uri);
post.addHeader(X_HTTP_METHOD_OVERRIDE, "PUT");
// mMediaInputStream.reset();
InputStreamEntity entity = new InputStreamEntity(mMediaInputStream,
-1 /* read until EOF */);
entity.setContentType(mContentType);
post.setEntity(entity);
return post;
}
}
/**
* @deprecated Use AndroidGDAtaClient(Context) instead.
*/
public AndroidGDataClient(ContentResolver resolver) {
mHttpClient = new GoogleHttpClient(resolver, DEFAULT_USER_AGENT_APP_VERSION,
true /* gzip capable */);
mHttpClient.enableCurlLogging(TAG, Log.VERBOSE);
mResolver = resolver;
}
/**
* Creates a new AndroidGDataClient.
*
* @param context The ContentResolver to get URL rewriting rules from
* through the Android proxy server, using null to indicate not using proxy.
* The context will also be used by GoogleHttpClient for configuration of
* SSL session persistence.
*/
public AndroidGDataClient(Context context) {
this(context, DEFAULT_USER_AGENT_APP_VERSION);
}
/**
* Creates a new AndroidGDataClient.
*
* @param context The ContentResolver to get URL rewriting rules from
* through the Android proxy server, using null to indicate not using proxy.
* The context will also be used by GoogleHttpClient for configuration of
* SSL session persistence.
* @param appAndVersion The application name and version to be used as the basis of the
* User-Agent. e.g., Android-GData/1.5.0.
*/
public AndroidGDataClient(Context context, String appAndVersion) {
mHttpClient = new GoogleHttpClient(context, appAndVersion,
true /* gzip capable */);
mHttpClient.enableCurlLogging(TAG, Log.VERBOSE);
mResolver = context.getContentResolver();
}
public void close() {
mHttpClient.close();
}
/*
* (non-Javadoc)
* @see GDataClient#encodeUri(java.lang.String)
*/
public String encodeUri(String uri) {
String encodedUri;
try {
encodedUri = URLEncoder.encode(uri, "UTF-8");
} catch (UnsupportedEncodingException uee) {
// should not happen.
Log.e("JakartaGDataClient",
"UTF-8 not supported -- should not happen. "
+ "Using default encoding.", uee);
encodedUri = URLEncoder.encode(uri);
}
return encodedUri;
}
/*
* (non-Javadoc)
* @see com.google.wireless.gdata.client.GDataClient#createQueryParams()
*/
public QueryParams createQueryParams() {
return new QueryParamsImpl();
}
// follows redirects
private InputStream createAndExecuteMethod(HttpRequestCreator creator,
String uriString,
String authToken)
throws HttpException, IOException {
HttpResponse response = null;
int status = 500;
int redirectsLeft = MAX_REDIRECTS;
URI uri;
try {
uri = new URI(uriString);
} catch (URISyntaxException use) {
Log.w(TAG, "Unable to parse " + uriString + " as URI.", use);
throw new IOException("Unable to parse " + uriString + " as URI: "
+ use.getMessage());
}
// we follow redirects ourselves, since we want to follow redirects even on POSTs, which
// the HTTP library does not do. following redirects ourselves also allows us to log
// the redirects using our own logging.
while (redirectsLeft > 0) {
HttpUriRequest request = creator.createRequest(uri);
AndroidHttpClient.modifyRequestToAcceptGzipResponse(request);
// only add the auth token if not null (to allow for GData feeds that do not require
// authentication.)
if (!TextUtils.isEmpty(authToken)) {
request.addHeader("Authorization", "GoogleLogin auth=" + authToken);
}
if (LOCAL_LOGV) {
for (Header h : request.getAllHeaders()) {
Log.v(TAG, h.getName() + ": " + h.getValue());
}
}
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "Executing " + request.getRequestLine().toString());
}
response = null;
try {
response = mHttpClient.execute(request);
} catch (IOException ioe) {
Log.w(TAG, "Unable to execute HTTP request." + ioe);
throw ioe;
}
StatusLine statusLine = response.getStatusLine();
if (statusLine == null) {
Log.w(TAG, "StatusLine is null.");
throw new NullPointerException("StatusLine is null -- should not happen.");
}
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, response.getStatusLine().toString());
for (Header h : response.getAllHeaders()) {
Log.d(TAG, h.getName() + ": " + h.getValue());
}
}
status = statusLine.getStatusCode();
HttpEntity entity = response.getEntity();
if ((status >= 200) && (status < 300) && entity != null) {
InputStream in = AndroidHttpClient.getUngzippedContent(entity);
if (Log.isLoggable(TAG, Log.DEBUG)) {
in = logInputStreamContents(in);
}
return in;
}
// TODO: handle 301, 307?
// TODO: let the http client handle the redirects, if we can be sure we'll never get a
// redirect on POST.
if (status == 302) {
// consume the content, so the connection can be closed.
entity.consumeContent();
Header location = response.getFirstHeader("Location");
if (location == null) {
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "Redirect requested but no Location "
+ "specified.");
}
break;
}
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "Following redirect to " + location.getValue());
}
try {
uri = new URI(location.getValue());
} catch (URISyntaxException use) {
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "Unable to parse " + location.getValue() + " as URI.", use);
throw new IOException("Unable to parse " + location.getValue()
+ " as URI.");
}
break;
}
--redirectsLeft;
} else {
break;
}
}
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "Received " + status + " status code.");
}
String errorMessage = null;
HttpEntity entity = response.getEntity();
try {
if (response != null && entity != null) {
InputStream in = AndroidHttpClient.getUngzippedContent(entity);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buf = new byte[8192];
int bytesRead = -1;
while ((bytesRead = in.read(buf)) != -1) {
baos.write(buf, 0, bytesRead);
}
// TODO: use appropriate encoding, picked up from Content-Type.
errorMessage = new String(baos.toByteArray());
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, errorMessage);
}
}
} finally {
if (entity != null) {
entity.consumeContent();
}
}
String exceptionMessage = "Received " + status + " status code";
if (errorMessage != null) {
exceptionMessage += (": " + errorMessage);
}
throw new HttpException(exceptionMessage, status, null /* InputStream */);
}
/*
* (non-Javadoc)
* @see GDataClient#getFeedAsStream(java.lang.String, java.lang.String)
*/
public InputStream getFeedAsStream(String feedUrl,
String authToken)
throws HttpException, IOException {
InputStream in = createAndExecuteMethod(new GetRequestCreator(), feedUrl, authToken);
if (in != null) {
return in;
}
throw new IOException("Unable to access feed.");
}
/**
* Log the contents of the input stream.
* The original input stream is consumed, so the caller must use the
* BufferedInputStream that is returned.
* @param in InputStream
* @return replacement input stream for caller to use
* @throws IOException
*/
private InputStream logInputStreamContents(InputStream in) throws IOException {
if (in == null) {
return in;
}
// bufferSize is the (arbitrary) maximum amount to log.
// The original InputStream is wrapped in a
// BufferedInputStream with a 16K buffer. This lets
// us read up to 16K, write it to the log, and then
// reset the stream so the the original client can
// then read the data. The BufferedInputStream
// provides the mark and reset support, even when
// the original InputStream does not.
final int bufferSize = 16384;
BufferedInputStream bin = new BufferedInputStream(in, bufferSize);
bin.mark(bufferSize);
int wanted = bufferSize;
int totalReceived = 0;
byte buf[] = new byte[wanted];
while (wanted > 0) {
int got = bin.read(buf, totalReceived, wanted);
if (got <= 0) break; // EOF
wanted -= got;
totalReceived += got;
}
Log.d(TAG, new String(buf, 0, totalReceived, "UTF-8"));
bin.reset();
return bin;
}
public InputStream getMediaEntryAsStream(String mediaEntryUrl, String authToken)
throws HttpException, IOException {
InputStream in = createAndExecuteMethod(new GetRequestCreator(), mediaEntryUrl, authToken);
if (in != null) {
return in;
}
throw new IOException("Unable to access media entry.");
}
/* (non-Javadoc)
* @see GDataClient#createEntry
*/
public InputStream createEntry(String feedUrl,
String authToken,
GDataSerializer entry)
throws HttpException, IOException {
HttpEntity entity = createEntityForEntry(entry, GDataSerializer.FORMAT_CREATE);
InputStream in = createAndExecuteMethod(
new PostRequestCreator(null /* override */, entity),
feedUrl,
authToken);
if (in != null) {
return in;
}
throw new IOException("Unable to create entry.");
}
/* (non-Javadoc)
* @see GDataClient#updateEntry
*/
public InputStream updateEntry(String editUri,
String authToken,
GDataSerializer entry)
throws HttpException, IOException {
HttpEntity entity = createEntityForEntry(entry, GDataSerializer.FORMAT_UPDATE);
InputStream in = createAndExecuteMethod(
new PostRequestCreator("PUT", entity),
editUri,
authToken);
if (in != null) {
return in;
}
throw new IOException("Unable to update entry.");
}
/* (non-Javadoc)
* @see GDataClient#deleteEntry
*/
public void deleteEntry(String editUri, String authToken)
throws HttpException, IOException {
if (StringUtils.isEmpty(editUri)) {
throw new IllegalArgumentException(
"you must specify an non-empty edit url");
}
InputStream in =
createAndExecuteMethod(
new PostRequestCreator("DELETE", null /* entity */),
editUri,
authToken);
if (in == null) {
throw new IOException("Unable to delete entry.");
}
try {
in.close();
} catch (IOException ioe) {
// ignore
}
}
public InputStream updateMediaEntry(String editUri, String authToken,
InputStream mediaEntryInputStream, String contentType)
throws HttpException, IOException {
InputStream in = createAndExecuteMethod(
new MediaPutRequestCreator(mediaEntryInputStream, contentType),
editUri,
authToken);
if (in != null) {
return in;
}
throw new IOException("Unable to write media entry.");
}
private HttpEntity createEntityForEntry(GDataSerializer entry, int format) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
entry.serialize(baos, format);
} catch (IOException ioe) {
Log.e(TAG, "Unable to serialize entry.", ioe);
throw ioe;
} catch (ParseException pe) {
Log.e(TAG, "Unable to serialize entry.", pe);
throw new IOException("Unable to serialize entry: " + pe.getMessage());
}
byte[] entryBytes = baos.toByteArray();
if (entryBytes != null && Log.isLoggable(TAG, Log.DEBUG)) {
try {
Log.d(TAG, "Serialized entry: " + new String(entryBytes, "UTF-8"));
} catch (UnsupportedEncodingException uee) {
// should not happen
throw new IllegalStateException("UTF-8 should be supported!",
uee);
}
}
AbstractHttpEntity entity = AndroidHttpClient.getCompressedEntity(entryBytes, mResolver);
entity.setContentType(entry.getContentType());
return entity;
}
}
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