/*
* 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();
}
/**
* 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);
}
}
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 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;
}
/**
* Issues the load request.
*
* <p>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;
}
/**
* Start loading a resource.
*
* @param loaderHandle The native ResourceLoader that is the target of the data.
* @param url The url to load.
* @param method The http method.
* @param headers The http headers.
* @param postData If the method is "POST" postData is sent as the request body. Is null when
* empty.
* @param cacheMode The cache mode to use when loading this resource.
* @param isHighPriority True if this resource needs to be put at the front of the network queue.
* @param synchronous True if the load is synchronous.
* @return A newly created LoadListener object.
*/
private LoadListener startLoadingResource(
int loaderHandle,
String url,
String method,
HashMap headers,
byte[] postData,
int cacheMode,
boolean isHighPriority,
boolean synchronous) {
PerfChecker checker = new PerfChecker();
if (mSettings.getCacheMode() != WebSettings.LOAD_DEFAULT) {
cacheMode = mSettings.getCacheMode();
}
if (method.equals("POST")) {
// Don't use the cache on POSTs when issuing a normal POST
// request.
if (cacheMode == WebSettings.LOAD_NORMAL) {
cacheMode = WebSettings.LOAD_NO_CACHE;
}
if (mSettings.getSavePassword() && hasPasswordField()) {
try {
if (WebView.DEBUG) {
Assert.assertNotNull(mCallbackProxy.getBackForwardList().getCurrentItem());
}
WebAddress uri =
new WebAddress(mCallbackProxy.getBackForwardList().getCurrentItem().getUrl());
String schemePlusHost = uri.mScheme + uri.mHost;
String[] ret = getUsernamePassword();
// Has the user entered a username/password pair and is
// there some POST data
if (ret != null && postData != null && ret[0].length() > 0 && ret[1].length() > 0) {
// Check to see if the username & password appear in
// the post data (there could be another form on the
// page and that was posted instead.
String postString = new String(postData);
if (postString.contains(URLEncoder.encode(ret[0]))
&& postString.contains(URLEncoder.encode(ret[1]))) {
String[] saved = mDatabase.getUsernamePassword(schemePlusHost);
if (saved != null) {
// null username implies that user has chosen not to
// save password
if (saved[0] != null) {
// non-null username implies that user has
// chosen to save password, so update the
// recorded password
mDatabase.setUsernamePassword(schemePlusHost, ret[0], ret[1]);
}
} else {
// CallbackProxy will handle creating the resume
// message
mCallbackProxy.onSavePassword(schemePlusHost, ret[0], ret[1], null);
}
}
}
} catch (ParseException ex) {
// if it is bad uri, don't save its password
}
}
}
// is this resource the main-frame top-level page?
boolean isMainFramePage = mIsMainFrame;
if (WebView.LOGV_ENABLED) {
Log.v(
LOGTAG,
"startLoadingResource: url="
+ url
+ ", method="
+ method
+ ", postData="
+ postData
+ ", isHighPriority="
+ isHighPriority
+ ", isMainFramePage="
+ isMainFramePage);
}
// Create a LoadListener
LoadListener loadListener =
LoadListener.getLoadListener(
mContext, this, url, loaderHandle, synchronous, isMainFramePage);
mCallbackProxy.onLoadResource(url);
if (LoadListener.getNativeLoaderCount() > MAX_OUTSTANDING_REQUESTS) {
loadListener.error(
android.net.http.EventHandler.ERROR,
mContext.getString(com.android.internal.R.string.httpErrorTooManyRequests));
loadListener.notifyError();
loadListener.tearDown();
return null;
}
// during synchronous load, the WebViewCore thread is blocked, so we
// need to endCacheTransaction first so that http thread won't be
// blocked in setupFile() when createCacheFile.
if (synchronous) {
CacheManager.endCacheTransaction();
}
FrameLoader loader = new FrameLoader(loadListener, mSettings, method, isHighPriority);
loader.setHeaders(headers);
loader.setPostData(postData);
// Set the load mode to the mode used for the current page.
// If WebKit wants validation, go to network directly.
loader.setCacheMode(
headers.containsKey("If-Modified-Since") || headers.containsKey("If-None-Match")
? WebSettings.LOAD_NO_CACHE
: cacheMode);
// Set referrer to current URL?
if (!loader.executeLoad()) {
checker.responseAlert("startLoadingResource fail");
}
checker.responseAlert("startLoadingResource succeed");
if (synchronous) {
CacheManager.startCacheTransaction();
}
return !synchronous ? loadListener : null;
}
/*
* 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;
}
/**
* Start loading a resource.
*
* @param loaderHandle The native ResourceLoader that is the target of the data.
* @param url The url to load.
* @param method The http method.
* @param headers The http headers.
* @param postData If the method is "POST" postData is sent as the request body. Is null when
* empty.
* @param postDataIdentifier If the post data contained form this is the form identifier,
* otherwise it is 0.
* @param cacheMode The cache mode to use when loading this resource. See WebSettings.setCacheMode
* @param mainResource True if the this resource is the main request, not a supporting resource
* @param userGesture
* @param synchronous True if the load is synchronous.
* @return A newly created LoadListener object.
*/
private LoadListener startLoadingResource(
int loaderHandle,
String url,
String method,
HashMap headers,
byte[] postData,
long postDataIdentifier,
int cacheMode,
boolean mainResource,
boolean userGesture,
boolean synchronous,
String username,
String password) {
if (mSettings.getCacheMode() != WebSettings.LOAD_DEFAULT) {
cacheMode = mSettings.getCacheMode();
}
if (method.equals("POST")) {
// Don't use the cache on POSTs when issuing a normal POST
// request.
if (cacheMode == WebSettings.LOAD_NORMAL) {
cacheMode = WebSettings.LOAD_NO_CACHE;
}
String[] ret = getUsernamePassword();
if (ret != null) {
String domUsername = ret[0];
String domPassword = ret[1];
maybeSavePassword(postData, domUsername, domPassword);
}
}
// is this resource the main-frame top-level page?
boolean isMainFramePage = mIsMainFrame;
if (DebugFlags.BROWSER_FRAME) {
Log.v(
LOGTAG,
"startLoadingResource: url="
+ url
+ ", method="
+ method
+ ", postData="
+ postData
+ ", isMainFramePage="
+ isMainFramePage
+ ", mainResource="
+ mainResource
+ ", userGesture="
+ userGesture);
}
// Create a LoadListener
LoadListener loadListener =
LoadListener.getLoadListener(
mContext,
this,
url,
loaderHandle,
synchronous,
isMainFramePage,
mainResource,
userGesture,
postDataIdentifier,
username,
password);
if (LoadListener.getNativeLoaderCount() > MAX_OUTSTANDING_REQUESTS) {
// send an error message, so that loadListener can be deleted
// after this is returned. This is important as LoadListener's
// nativeError will remove the request from its DocLoader's request
// list. But the set up is not done until this method is returned.
loadListener.error(
android.net.http.EventHandler.ERROR,
mContext.getString(com.android.internal.R.string.httpErrorTooManyRequests));
return loadListener;
}
// Note that we are intentionally skipping
// inputStreamForAndroidResource. This is so that FrameLoader will use
// the various StreamLoader classes to handle assets.
FrameLoader loader =
new FrameLoader(
loadListener, mSettings, method, mCallbackProxy.shouldInterceptRequest(url));
loader.setHeaders(headers);
loader.setPostData(postData);
// Set the load mode to the mode used for the current page.
// If WebKit wants validation, go to network directly.
loader.setCacheMode(
headers.containsKey("If-Modified-Since") || headers.containsKey("If-None-Match")
? WebSettings.LOAD_NO_CACHE
: cacheMode);
loader.executeLoad();
// Set referrer to current URL?
return !synchronous ? loadListener : null;
}
