/*
* 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;
}
/**
* 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;
}
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;
}
/* 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;
}
/*
* 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;
}