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/*
* Copyright (C) 2006 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 android.webkit;
import android.net.http.EventHandler;
import android.net.http.RequestHandle;
import android.util.Log;
import android.webkit.CacheManager.CacheResult;
import java.util.HashMap;
import java.util.Map;
class FrameLoader {
private final LoadListener mListener;
private final String mMethod;
private final boolean mIsHighPriority;
private final WebSettings mSettings;
private Map<String, String> mHeaders;
private byte[] mPostData;
private Network mNetwork;
private int mCacheMode;
private String mReferrer;
private String mContentType;
private static final int URI_PROTOCOL = 0x100;
private static final String CONTENT_TYPE = "content-type";
// Contents of an about:blank page
private static final String mAboutBlank =
"<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EB\">" +
"<html><head><title>about:blank</title></head><body></body></html>";
static final String HEADER_STR = "text/xml, text/html, " +
"application/xhtml+xml, image/png, text/plain, */*;q=0.8";
private static final String LOGTAG = "webkit";
FrameLoader(LoadListener listener, WebSettings settings,
String method, boolean highPriority) {
mListener = listener;
mHeaders = null;
mMethod = method;
mIsHighPriority = highPriority;
mCacheMode = WebSettings.LOAD_NORMAL;
mSettings = settings;
}
public void setReferrer(String ref) {
// only set referrer for http or https
if (URLUtil.isNetworkUrl(ref)) mReferrer = ref;
}
public void setPostData(byte[] postData) {
mPostData = postData;
}
public void setContentTypeForPost(String postContentType) {
mContentType = postContentType;
}
public void setCacheMode(int cacheMode) {
mCacheMode = cacheMode;
}
public void setHeaders(HashMap headers) {
mHeaders = headers;
}
public LoadListener getLoadListener() {
return mListener;
}
/**
* Issues the load request.
*
* Return value does not indicate if the load was successful or not. It
* simply indicates that the load request is reasonable.
*
* @return true if the load is reasonable.
*/
public boolean executeLoad() {
String url = mListener.url();
// Attempt to decode the percent-encoded url.
try {
url = new String(URLUtil.decode(url.getBytes()));
} catch (IllegalArgumentException e) {
// Fail with a bad url error if the decode fails.
mListener.error(EventHandler.ERROR_BAD_URL,
mListener.getContext().getString(
com.android.internal.R.string.httpErrorBadUrl));
return false;
}
if (URLUtil.isNetworkUrl(url)){
if (mSettings.getBlockNetworkLoads()) {
mListener.error(EventHandler.ERROR_BAD_URL,
mListener.getContext().getString(
com.android.internal.R.string.httpErrorBadUrl));
return false;
}
mNetwork = Network.getInstance(mListener.getContext());
return handleHTTPLoad();
} else if (handleLocalFile(url, mListener, mSettings)) {
return true;
}
if (WebView.LOGV_ENABLED) {
Log.v(LOGTAG, "FrameLoader.executeLoad: url protocol not supported:"
+ mListener.url());
}
mListener.error(EventHandler.ERROR_UNSUPPORTED_SCHEME,
mListener.getContext().getText(
com.android.internal.R.string.httpErrorUnsupportedScheme).toString());
return false;
}
/* package */
static boolean handleLocalFile(String url, LoadListener loadListener,
WebSettings settings) {
if (URLUtil.isAssetUrl(url)) {
FileLoader.requestUrl(url, loadListener, loadListener.getContext(),
true, settings.getAllowFileAccess());
return true;
} else if (URLUtil.isFileUrl(url)) {
FileLoader.requestUrl(url, loadListener, loadListener.getContext(),
false, settings.getAllowFileAccess());
return true;
} else if (URLUtil.isContentUrl(url)) {
// Send the raw url to the ContentLoader because it will do a
// permission check and the url has to match..
ContentLoader.requestUrl(loadListener.url(), loadListener,
loadListener.getContext());
return true;
} else if (URLUtil.isDataUrl(url)) {
DataLoader.requestUrl(url, loadListener);
return true;
} else if (URLUtil.isAboutUrl(url)) {
loadListener.data(mAboutBlank.getBytes(), mAboutBlank.length());
loadListener.endData();
return true;
}
return false;
}
private boolean handleHTTPLoad() {
if (mHeaders == null) {
mHeaders = new HashMap<String, String>();
}
populateStaticHeaders();
populateHeaders();
// response was handled by UrlIntercept, don't issue HTTP request
if (handleUrlIntercept()) return true;
// response was handled by Cache, don't issue HTTP request
if (handleCache()) {
// push the request data down to the LoadListener
// as response from the cache could be a redirect
// and we may need to initiate a network request if the cache
// can't satisfy redirect URL
mListener.setRequestData(mMethod, mHeaders, mPostData,
mIsHighPriority);
return true;
}
if (WebView.LOGV_ENABLED) {
Log.v(LOGTAG, "FrameLoader: http " + mMethod + " load for: "
+ mListener.url());
}
boolean ret = false;
int error = EventHandler.ERROR_UNSUPPORTED_SCHEME;
try {
ret = mNetwork.requestURL(mMethod, mHeaders,
mPostData, mListener, mIsHighPriority);
} catch (android.net.ParseException ex) {
error = EventHandler.ERROR_BAD_URL;
} catch (java.lang.RuntimeException ex) {
/* probably an empty header set by javascript. We want
the same result as bad URL */
error = EventHandler.ERROR_BAD_URL;
}
if (!ret) {
mListener.error(error, mListener.getContext().getText(
EventHandler.errorStringResources[Math.abs(error)]).toString());
return false;
}
return true;
}
/*
* This function is used by handleUrlInterecpt and handleCache to
* setup a load from the byte stream in a CacheResult.
*/
private void startCacheLoad(CacheResult result) {
if (WebView.LOGV_ENABLED) {
Log.v(LOGTAG, "FrameLoader: loading from cache: "
+ mListener.url());
}
// Tell the Listener respond with the cache file
CacheLoader cacheLoader =
new CacheLoader(mListener, result);
mListener.setCacheLoader(cacheLoader);
cacheLoader.load();
}
/*
* This function is used by handleHTTPLoad to allow URL
* interception. This can be used to provide alternative load
* methods such as locally stored versions or for debugging.
*
* Returns true if the response was handled by UrlIntercept.
*/
private boolean handleUrlIntercept() {
// Check if the URL can be served from UrlIntercept. If
// successful, return the data just like a cache hit.
PluginData data = UrlInterceptRegistry.getPluginData(
mListener.url(), mHeaders);
if(data != null) {
PluginContentLoader loader =
new PluginContentLoader(mListener, data);
loader.load();
return true;
}
// Not intercepted. Carry on as normal.
return false;
}
/*
* This function is used by the handleHTTPLoad to setup the cache headers
* correctly.
* Returns true if the response was handled from the cache
*/
private boolean handleCache() {
switch (mCacheMode) {
// This mode is normally used for a reload, it instructs the http
// loader to not use the cached content.
case WebSettings.LOAD_NO_CACHE:
break;
// This mode is used when the content should only be loaded from
// the cache. If it is not there, then fail the load. This is used
// to load POST content in a history navigation.
case WebSettings.LOAD_CACHE_ONLY: {
CacheResult result = CacheManager.getCacheFile(mListener.url(),
null);
if (result != null) {
startCacheLoad(result);
} else {
// This happens if WebCore was first told that the POST
// response was in the cache, then when we try to use it
// it has gone.
// Generate a file not found error
int err = EventHandler.FILE_NOT_FOUND_ERROR;
mListener.error(err, mListener.getContext().getText(
EventHandler.errorStringResources[Math.abs(err)])
.toString());
}
return true;
}
// This mode is for when the user is doing a history navigation
// in the browser and should returned cached content regardless
// of it's state. If it is not in the cache, then go to the
// network.
case WebSettings.LOAD_CACHE_ELSE_NETWORK: {
if (WebView.LOGV_ENABLED) {
Log.v(LOGTAG, "FrameLoader: checking cache: "
+ mListener.url());
}
// Get the cache file name for the current URL, passing null for
// the validation headers causes no validation to occur
CacheResult result = CacheManager.getCacheFile(mListener.url(),
null);
if (result != null) {
startCacheLoad(result);
return true;
}
break;
}
// This is the default case, which is to check to see if the
// content in the cache can be used. If it can be used, then
// use it. If it needs revalidation then the relevant headers
// are added to the request.
default:
case WebSettings.LOAD_NORMAL:
return mListener.checkCache(mHeaders);
}// end of switch
return false;
}
/**
* Add the static headers that don't change with each request.
*/
private void populateStaticHeaders() {
// Accept header should already be there as they are built by WebCore,
// but in the case they are missing, add some.
String accept = mHeaders.get("Accept");
if (accept == null || accept.length() == 0) {
mHeaders.put("Accept", HEADER_STR);
}
mHeaders.put("Accept-Charset", "utf-8, iso-8859-1, utf-16, *;q=0.7");
String acceptLanguage = mSettings.getAcceptLanguage();
if (acceptLanguage.length() > 0) {
mHeaders.put("Accept-Language", acceptLanguage);
}
mHeaders.put("User-Agent", mSettings.getUserAgentString());
}
/**
* Add the content related headers. These headers contain user private data
* and is not used when we are proxying an untrusted request.
*/
private void populateHeaders() {
if (mReferrer != null) mHeaders.put("Referer", mReferrer);
if (mContentType != null) mHeaders.put(CONTENT_TYPE, mContentType);
// if we have an active proxy and have proxy credentials, do pre-emptive
// authentication to avoid an extra round-trip:
if (mNetwork.isValidProxySet()) {
String username;
String password;
/* The proxy credentials can be set in the Network thread */
synchronized (mNetwork) {
username = mNetwork.getProxyUsername();
password = mNetwork.getProxyPassword();
}
if (username != null && password != null) {
// we collect credentials ONLY if the proxy scheme is BASIC!!!
String proxyHeader = RequestHandle.authorizationHeader(true);
mHeaders.put(proxyHeader,
"Basic " + RequestHandle.computeBasicAuthResponse(
username, password));
}
}
// Set cookie header
String cookie = CookieManager.getInstance().getCookie(
mListener.getWebAddress());
if (cookie != null && cookie.length() > 0) {
mHeaders.put("cookie", cookie);
}
}
}
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