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gecko-dev/uriloader/exthandler/nsExternalHelperAppService.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim:expandtab:shiftwidth=2:tabstop=2:cin:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "base/basictypes.h"
/* This must occur *after* base/basictypes.h to avoid typedefs conflicts. */
#include "mozilla/ArrayUtils.h"
#include "mozilla/Base64.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/BrowserChild.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "mozilla/dom/WindowGlobalParent.h"
#include "mozilla/StaticPrefs_security.h"
#include "nsXULAppAPI.h"
#include "nsExternalHelperAppService.h"
#include "nsCExternalHandlerService.h"
#include "nsIURI.h"
#include "nsIURL.h"
#include "nsIFile.h"
#include "nsIFileURL.h"
#include "nsIChannel.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsICategoryManager.h"
#include "nsDependentSubstring.h"
#include "nsString.h"
#include "nsUnicharUtils.h"
#include "nsIStringEnumerator.h"
#include "nsMemory.h"
#include "nsIStreamListener.h"
#include "nsIMIMEService.h"
#include "nsILoadGroup.h"
#include "nsIWebProgressListener.h"
#include "nsITransfer.h"
#include "nsReadableUtils.h"
#include "nsIRequest.h"
#include "nsDirectoryServiceDefs.h"
#include "nsIInterfaceRequestor.h"
#include "nsThreadUtils.h"
#include "nsIMutableArray.h"
#include "nsIRedirectHistoryEntry.h"
#include "nsOSHelperAppService.h"
#include "nsOSHelperAppServiceChild.h"
// used to access our datastore of user-configured helper applications
#include "nsIHandlerService.h"
#include "nsIMIMEInfo.h"
#include "nsIHelperAppLauncherDialog.h"
#include "nsIContentDispatchChooser.h"
#include "nsNetUtil.h"
#include "nsIPrivateBrowsingChannel.h"
#include "nsIIOService.h"
#include "nsNetCID.h"
#include "nsIApplicationReputation.h"
#include "nsDSURIContentListener.h"
#include "nsMimeTypes.h"
// used for header disposition information.
#include "nsIHttpChannel.h"
#include "nsIHttpChannelInternal.h"
#include "nsIEncodedChannel.h"
#include "nsIMultiPartChannel.h"
#include "nsIFileChannel.h"
#include "nsIObserverService.h" // so we can be a profile change observer
#include "nsIPropertyBag2.h" // for the 64-bit content length
#ifdef XP_MACOSX
# include "nsILocalFileMac.h"
#endif
#include "nsPluginHost.h"
#include "nsEscape.h"
#include "nsIStringBundle.h" // XXX needed to localize error msgs
#include "nsIPrompt.h"
#include "nsITextToSubURI.h" // to unescape the filename
#include "nsDocShellCID.h"
#include "nsCRT.h"
#include "nsLocalHandlerApp.h"
#include "nsIRandomGenerator.h"
#include "ContentChild.h"
#include "nsXULAppAPI.h"
#include "nsPIDOMWindow.h"
#include "ExternalHelperAppChild.h"
#ifdef XP_WIN
# include "nsWindowsHelpers.h"
#endif
#include "mozilla/Components.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Preferences.h"
#include "mozilla/ipc/URIUtils.h"
using namespace mozilla;
using namespace mozilla::ipc;
using namespace mozilla::dom;
// Download Folder location constants
#define NS_PREF_DOWNLOAD_DIR "browser.download.dir"
#define NS_PREF_DOWNLOAD_FOLDERLIST "browser.download.folderList"
enum {
NS_FOLDER_VALUE_DESKTOP = 0,
NS_FOLDER_VALUE_DOWNLOADS = 1,
NS_FOLDER_VALUE_CUSTOM = 2
};
LazyLogModule nsExternalHelperAppService::mLog("HelperAppService");
// Using level 3 here because the OSHelperAppServices use a log level
// of LogLevel::Debug (4), and we want less detailed output here
// Using 3 instead of LogLevel::Warning because we don't output warnings
#undef LOG
#define LOG(args) \
MOZ_LOG(nsExternalHelperAppService::mLog, mozilla::LogLevel::Info, args)
#define LOG_ENABLED() \
MOZ_LOG_TEST(nsExternalHelperAppService::mLog, mozilla::LogLevel::Info)
static const char NEVER_ASK_FOR_SAVE_TO_DISK_PREF[] =
"browser.helperApps.neverAsk.saveToDisk";
static const char NEVER_ASK_FOR_OPEN_FILE_PREF[] =
"browser.helperApps.neverAsk.openFile";
// Helper functions for Content-Disposition headers
/**
* Given a URI fragment, unescape it
* @param aFragment The string to unescape
* @param aURI The URI from which this fragment is taken. Only its character set
* will be used.
* @param aResult [out] Unescaped string.
*/
static nsresult UnescapeFragment(const nsACString& aFragment, nsIURI* aURI,
nsAString& aResult) {
// We need the unescaper
nsresult rv;
nsCOMPtr<nsITextToSubURI> textToSubURI =
do_GetService(NS_ITEXTTOSUBURI_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
return textToSubURI->UnEscapeURIForUI(aFragment, aResult);
}
/**
* UTF-8 version of UnescapeFragment.
* @param aFragment The string to unescape
* @param aURI The URI from which this fragment is taken. Only its character set
* will be used.
* @param aResult [out] Unescaped string, UTF-8 encoded.
* @note It is safe to pass the same string for aFragment and aResult.
* @note When this function fails, aResult will not be modified.
*/
static nsresult UnescapeFragment(const nsACString& aFragment, nsIURI* aURI,
nsACString& aResult) {
nsAutoString result;
nsresult rv = UnescapeFragment(aFragment, aURI, result);
if (NS_SUCCEEDED(rv)) CopyUTF16toUTF8(result, aResult);
return rv;
}
/**
* Given a channel, returns the filename and extension the channel has.
* This uses the URL and other sources (nsIMultiPartChannel).
* Also gives back whether the channel requested external handling (i.e.
* whether Content-Disposition: attachment was sent)
* @param aChannel The channel to extract the filename/extension from
* @param aFileName [out] Reference to the string where the filename should be
* stored. Empty if it could not be retrieved.
* WARNING - this filename may contain characters which the OS does not
* allow as part of filenames!
* @param aExtension [out] Reference to the string where the extension should
* be stored. Empty if it could not be retrieved. Stored in UTF-8.
* @param aAllowURLExtension (optional) Get the extension from the URL if no
* Content-Disposition header is present. Default is true.
* @retval true The server sent Content-Disposition:attachment or equivalent
* @retval false Content-Disposition: inline or no content-disposition header
* was sent.
*/
static bool GetFilenameAndExtensionFromChannel(nsIChannel* aChannel,
nsString& aFileName,
nsCString& aExtension,
bool aAllowURLExtension = true) {
aExtension.Truncate();
/*
* If the channel is an http or part of a multipart channel and we
* have a content disposition header set, then use the file name
* suggested there as the preferred file name to SUGGEST to the
* user. we shouldn't actually use that without their
* permission... otherwise just use our temp file
*/
bool handleExternally = false;
uint32_t disp;
nsresult rv = aChannel->GetContentDisposition(&disp);
if (NS_SUCCEEDED(rv)) {
aChannel->GetContentDispositionFilename(aFileName);
if (disp == nsIChannel::DISPOSITION_ATTACHMENT) handleExternally = true;
}
// If the disposition header didn't work, try the filename from nsIURL
nsCOMPtr<nsIURI> uri;
aChannel->GetURI(getter_AddRefs(uri));
nsCOMPtr<nsIURL> url(do_QueryInterface(uri));
if (url && aFileName.IsEmpty()) {
if (aAllowURLExtension) {
url->GetFileExtension(aExtension);
UnescapeFragment(aExtension, url, aExtension);
// Windows ignores terminating dots. So we have to as well, so
// that our security checks do "the right thing"
// In case the aExtension consisted only of the dot, the code below will
// extract an aExtension from the filename
aExtension.Trim(".", false);
}
// try to extract the file name from the url and use that as a first pass as
// the leaf name of our temp file...
nsAutoCString leafName;
url->GetFileName(leafName);
if (!leafName.IsEmpty()) {
rv = UnescapeFragment(leafName, url, aFileName);
if (NS_FAILED(rv)) {
CopyUTF8toUTF16(leafName, aFileName); // use escaped name
}
}
}
// Extract Extension, if we have a filename; otherwise,
// truncate the string
if (aExtension.IsEmpty()) {
if (!aFileName.IsEmpty()) {
// Windows ignores terminating dots. So we have to as well, so
// that our security checks do "the right thing"
aFileName.Trim(".", false);
// XXX RFindCharInReadable!!
nsAutoString fileNameStr(aFileName);
int32_t idx = fileNameStr.RFindChar(char16_t('.'));
if (idx != kNotFound)
CopyUTF16toUTF8(StringTail(fileNameStr, fileNameStr.Length() - idx - 1),
aExtension);
}
}
return handleExternally;
}
/**
* Obtains the directory to use. This tends to vary per platform, and
* needs to be consistent throughout our codepaths. For platforms where
* helper apps use the downloads directory, this should be kept in
* sync with DownloadIntegration.jsm.
*
* Optionally skip availability of the directory and storage.
*/
static nsresult GetDownloadDirectory(nsIFile** _directory,
bool aSkipChecks = false) {
nsCOMPtr<nsIFile> dir;
#ifdef XP_MACOSX
// On OS X, we first try to get the users download location, if it's set.
switch (Preferences::GetInt(NS_PREF_DOWNLOAD_FOLDERLIST, -1)) {
case NS_FOLDER_VALUE_DESKTOP:
(void)NS_GetSpecialDirectory(NS_OS_DESKTOP_DIR, getter_AddRefs(dir));
break;
case NS_FOLDER_VALUE_CUSTOM: {
Preferences::GetComplex(NS_PREF_DOWNLOAD_DIR, NS_GET_IID(nsIFile),
getter_AddRefs(dir));
if (!dir) break;
// If we're not checking for availability we're done.
if (aSkipChecks) {
dir.forget(_directory);
return NS_OK;
}
// We have the directory, and now we need to make sure it exists
bool dirExists = false;
(void)dir->Exists(&dirExists);
if (dirExists) break;
nsresult rv = dir->Create(nsIFile::DIRECTORY_TYPE, 0755);
if (NS_FAILED(rv)) {
dir = nullptr;
break;
}
} break;
case NS_FOLDER_VALUE_DOWNLOADS:
// This is just the OS default location, so fall out
break;
}
if (!dir) {
// If not, we default to the OS X default download location.
nsresult rv = NS_GetSpecialDirectory(NS_OSX_DEFAULT_DOWNLOAD_DIR,
getter_AddRefs(dir));
NS_ENSURE_SUCCESS(rv, rv);
}
#elif defined(ANDROID)
return NS_ERROR_FAILURE;
#else
// On all other platforms, we default to the systems temporary directory.
nsresult rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(dir));
NS_ENSURE_SUCCESS(rv, rv);
# if defined(XP_UNIX)
// Ensuring that only the current user can read the file names we end up
// creating. Note that Creating directories with specified permission only
// supported on Unix platform right now. That's why above if exists.
uint32_t permissions;
rv = dir->GetPermissions(&permissions);
NS_ENSURE_SUCCESS(rv, rv);
if (permissions != PR_IRWXU) {
const char* userName = PR_GetEnv("USERNAME");
if (!userName || !*userName) {
userName = PR_GetEnv("USER");
}
if (!userName || !*userName) {
userName = PR_GetEnv("LOGNAME");
}
if (!userName || !*userName) {
userName = "mozillaUser";
}
nsAutoString userDir;
userDir.AssignLiteral("mozilla_");
userDir.AppendASCII(userName);
userDir.ReplaceChar(FILE_PATH_SEPARATOR FILE_ILLEGAL_CHARACTERS, '_');
int counter = 0;
bool pathExists;
nsCOMPtr<nsIFile> finalPath;
while (true) {
nsAutoString countedUserDir(userDir);
countedUserDir.AppendInt(counter, 10);
dir->Clone(getter_AddRefs(finalPath));
finalPath->Append(countedUserDir);
rv = finalPath->Exists(&pathExists);
NS_ENSURE_SUCCESS(rv, rv);
if (pathExists) {
// If this path has the right permissions, use it.
rv = finalPath->GetPermissions(&permissions);
NS_ENSURE_SUCCESS(rv, rv);
// Ensuring the path is writable by the current user.
bool isWritable;
rv = finalPath->IsWritable(&isWritable);
NS_ENSURE_SUCCESS(rv, rv);
if (permissions == PR_IRWXU && isWritable) {
dir = finalPath;
break;
}
}
rv = finalPath->Create(nsIFile::DIRECTORY_TYPE, PR_IRWXU);
if (NS_SUCCEEDED(rv)) {
dir = finalPath;
break;
} else if (rv != NS_ERROR_FILE_ALREADY_EXISTS) {
// Unexpected error.
return rv;
}
counter++;
}
}
# endif
#endif
NS_ASSERTION(dir, "Somehow we didn't get a download directory!");
dir.forget(_directory);
return NS_OK;
}
/**
* Structure for storing extension->type mappings.
* @see defaultMimeEntries
*/
struct nsDefaultMimeTypeEntry {
const char* mMimeType;
const char* mFileExtension;
};
/**
* Default extension->mimetype mappings. These are not overridable.
* If you add types here, make sure they are lowercase, or you'll regret it.
*/
static const nsDefaultMimeTypeEntry defaultMimeEntries[] = {
// The following are those extensions that we're asked about during startup,
// sorted by order used
{IMAGE_GIF, "gif"},
{TEXT_XML, "xml"},
{APPLICATION_RDF, "rdf"},
{IMAGE_PNG, "png"},
// -- end extensions used during startup
{TEXT_CSS, "css"},
{IMAGE_JPEG, "jpeg"},
{IMAGE_JPEG, "jpg"},
{IMAGE_SVG_XML, "svg"},
{TEXT_HTML, "html"},
{TEXT_HTML, "htm"},
{APPLICATION_XPINSTALL, "xpi"},
{"application/xhtml+xml", "xhtml"},
{"application/xhtml+xml", "xht"},
{TEXT_PLAIN, "txt"},
{APPLICATION_JSON, "json"},
{APPLICATION_XJAVASCRIPT, "js"},
{APPLICATION_XJAVASCRIPT, "jsm"},
{VIDEO_OGG, "ogv"},
{VIDEO_OGG, "ogg"},
{APPLICATION_OGG, "ogg"},
{AUDIO_OGG, "oga"},
{AUDIO_OGG, "opus"},
{APPLICATION_PDF, "pdf"},
{VIDEO_WEBM, "webm"},
{AUDIO_WEBM, "webm"},
{IMAGE_ICO, "ico"},
{TEXT_PLAIN, "properties"},
{TEXT_PLAIN, "locale"},
{TEXT_PLAIN, "ftl"},
#if defined(MOZ_WMF)
{VIDEO_MP4, "mp4"},
{AUDIO_MP4, "m4a"},
{AUDIO_MP3, "mp3"},
#endif
#ifdef MOZ_RAW
{VIDEO_RAW, "yuv"}
#endif
};
/**
* This is a small private struct used to help us initialize some
* default mime types.
*/
struct nsExtraMimeTypeEntry {
const char* mMimeType;
const char* mFileExtensions;
const char* mDescription;
};
#ifdef XP_MACOSX
# define MAC_TYPE(x) x
#else
# define MAC_TYPE(x) 0
#endif
/**
* This table lists all of the 'extra' content types that we can deduce from
* particular file extensions. These entries also ensure that we provide a good
* descriptive name when we encounter files with these content types and/or
* extensions. These can be overridden by user helper app prefs. If you add
* types here, make sure they are lowercase, or you'll regret it.
*/
static const nsExtraMimeTypeEntry extraMimeEntries[] = {
#if defined(XP_MACOSX) // don't define .bin on the mac...use internet config to
// look that up...
{APPLICATION_OCTET_STREAM, "exe,com", "Binary File"},
#else
{APPLICATION_OCTET_STREAM, "exe,com,bin", "Binary File"},
#endif
{APPLICATION_GZIP2, "gz", "gzip"},
{"application/x-arj", "arj", "ARJ file"},
{"application/rtf", "rtf", "Rich Text Format File"},
{APPLICATION_XPINSTALL, "xpi", "XPInstall Install"},
{APPLICATION_PDF, "pdf", "Portable Document Format"},
{APPLICATION_POSTSCRIPT, "ps,eps,ai", "Postscript File"},
{APPLICATION_XJAVASCRIPT, "js", "Javascript Source File"},
{APPLICATION_XJAVASCRIPT, "jsm,mjs", "Javascript Module Source File"},
#ifdef MOZ_WIDGET_ANDROID
{"application/vnd.android.package-archive", "apk", "Android Package"},
#endif
// Note: if you add new image types, please also update the list in
// contentAreaUtils.js to match.
{IMAGE_ART, "art", "ART Image"},
{IMAGE_BMP, "bmp", "BMP Image"},
{IMAGE_GIF, "gif", "GIF Image"},
{IMAGE_ICO, "ico,cur", "ICO Image"},
{IMAGE_JPEG, "jpeg,jpg,jfif,pjpeg,pjp", "JPEG Image"},
{IMAGE_PNG, "png", "PNG Image"},
{IMAGE_APNG, "apng", "APNG Image"},
{IMAGE_TIFF, "tiff,tif", "TIFF Image"},
{IMAGE_XBM, "xbm", "XBM Image"},
{IMAGE_SVG_XML, "svg", "Scalable Vector Graphics"},
{IMAGE_WEBP, "webp", "WebP Image"},
{IMAGE_AVIF, "avif", "AV1 Image File"},
{MESSAGE_RFC822, "eml", "RFC-822 data"},
{TEXT_PLAIN, "txt,text", "Text File"},
{APPLICATION_JSON, "json", "JavaScript Object Notation"},
{TEXT_VTT, "vtt", "Web Video Text Tracks"},
{TEXT_CACHE_MANIFEST, "appcache", "Application Cache Manifest"},
{TEXT_HTML, "html,htm,shtml,ehtml", "HyperText Markup Language"},
{"application/xhtml+xml", "xhtml,xht",
"Extensible HyperText Markup Language"},
{APPLICATION_MATHML_XML, "mml", "Mathematical Markup Language"},
{APPLICATION_RDF, "rdf", "Resource Description Framework"},
{TEXT_XML, "xml,xsl,xbl", "Extensible Markup Language"},
{TEXT_CSS, "css", "Style Sheet"},
{TEXT_VCARD, "vcf,vcard", "Contact Information"},
{VIDEO_OGG, "ogv", "Ogg Video"},
{VIDEO_OGG, "ogg", "Ogg Video"},
{APPLICATION_OGG, "ogg", "Ogg Video"},
{AUDIO_OGG, "oga", "Ogg Audio"},
{AUDIO_OGG, "opus", "Opus Audio"},
{VIDEO_WEBM, "webm", "Web Media Video"},
{AUDIO_WEBM, "webm", "Web Media Audio"},
{AUDIO_MP3, "mp3", "MPEG Audio"},
{VIDEO_MP4, "mp4", "MPEG-4 Video"},
{AUDIO_MP4, "m4a", "MPEG-4 Audio"},
{VIDEO_RAW, "yuv", "Raw YUV Video"},
{AUDIO_WAV, "wav", "Waveform Audio"},
{VIDEO_3GPP, "3gpp,3gp", "3GPP Video"},
{VIDEO_3GPP2, "3g2", "3GPP2 Video"},
{AUDIO_MIDI, "mid", "Standard MIDI Audio"},
{APPLICATION_WASM, "wasm", "WebAssembly Module"}};
#undef MAC_TYPE
/**
* File extensions for which decoding should be disabled.
* NOTE: These MUST be lower-case and ASCII.
*/
static const nsDefaultMimeTypeEntry nonDecodableExtensions[] = {
{APPLICATION_GZIP, "gz"},
{APPLICATION_GZIP, "tgz"},
{APPLICATION_ZIP, "zip"},
{APPLICATION_COMPRESS, "z"},
{APPLICATION_GZIP, "svgz"}};
static StaticRefPtr<nsExternalHelperAppService> sExtHelperAppSvcSingleton;
/**
* On Mac child processes, return an nsOSHelperAppServiceChild for remoting
* OS calls to the parent process. On all other platforms use
* nsOSHelperAppService.
*/
/* static */
already_AddRefed<nsExternalHelperAppService>
nsExternalHelperAppService::GetSingleton() {
if (!sExtHelperAppSvcSingleton) {
#ifdef XP_MACOSX
if (XRE_IsParentProcess()) {
sExtHelperAppSvcSingleton = new nsOSHelperAppService();
} else {
sExtHelperAppSvcSingleton = new nsOSHelperAppServiceChild();
}
#else
sExtHelperAppSvcSingleton = new nsOSHelperAppService();
#endif /* XP_MACOSX */
ClearOnShutdown(&sExtHelperAppSvcSingleton);
}
return do_AddRef(sExtHelperAppSvcSingleton);
}
NS_IMPL_ISUPPORTS(nsExternalHelperAppService, nsIExternalHelperAppService,
nsPIExternalAppLauncher, nsIExternalProtocolService,
nsIMIMEService, nsIObserver, nsISupportsWeakReference)
nsExternalHelperAppService::nsExternalHelperAppService() {}
nsresult nsExternalHelperAppService::Init() {
// Add an observer for profile change
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (!obs) return NS_ERROR_FAILURE;
nsresult rv = obs->AddObserver(this, "profile-before-change", true);
NS_ENSURE_SUCCESS(rv, rv);
return obs->AddObserver(this, "last-pb-context-exited", true);
}
nsExternalHelperAppService::~nsExternalHelperAppService() {}
nsresult nsExternalHelperAppService::DoContentContentProcessHelper(
const nsACString& aMimeContentType, nsIRequest* aRequest,
BrowsingContext* aContentContext, bool aForceSave,
nsIInterfaceRequestor* aWindowContext,
nsIStreamListener** aStreamListener) {
// We need to get a hold of a ContentChild so that we can begin forwarding
// this data to the parent. In the HTTP case, this is unfortunate, since
// we're actually passing data from parent->child->parent wastefully, but
// the Right Fix will eventually be to short-circuit those channels on the
// parent side based on some sort of subscription concept.
using mozilla::dom::ContentChild;
using mozilla::dom::ExternalHelperAppChild;
ContentChild* child = ContentChild::GetSingleton();
if (!child) {
return NS_ERROR_FAILURE;
}
nsCString disp;
nsCOMPtr<nsIURI> uri;
int64_t contentLength = -1;
bool wasFileChannel = false;
uint32_t contentDisposition = -1;
nsAutoString fileName;
nsCOMPtr<nsILoadInfo> loadInfo;
nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
if (channel) {
channel->GetURI(getter_AddRefs(uri));
channel->GetContentLength(&contentLength);
channel->GetContentDisposition(&contentDisposition);
channel->GetContentDispositionFilename(fileName);
channel->GetContentDispositionHeader(disp);
loadInfo = channel->LoadInfo();
nsCOMPtr<nsIFileChannel> fileChan(do_QueryInterface(aRequest));
wasFileChannel = fileChan != nullptr;
}
nsCOMPtr<nsIURI> referrer;
NS_GetReferrerFromChannel(channel, getter_AddRefs(referrer));
Maybe<mozilla::net::LoadInfoArgs> loadInfoArgs;
MOZ_ALWAYS_SUCCEEDS(LoadInfoToLoadInfoArgs(loadInfo, &loadInfoArgs));
nsCOMPtr<nsIPropertyBag2> props(do_QueryInterface(aRequest));
// Determine whether a new window was opened specifically for this request
bool shouldCloseWindow = false;
if (props) {
props->GetPropertyAsBool(NS_LITERAL_STRING("docshell.newWindowTarget"),
&shouldCloseWindow);
}
// Now we build a protocol for forwarding our data to the parent. The
// protocol will act as a listener on the child-side and create a "real"
// helperAppService listener on the parent-side, via another call to
// DoContent.
RefPtr<ExternalHelperAppChild> childListener = new ExternalHelperAppChild();
MOZ_ALWAYS_TRUE(child->SendPExternalHelperAppConstructor(
childListener, uri, loadInfoArgs, nsCString(aMimeContentType), disp,
contentDisposition, fileName, aForceSave, contentLength, wasFileChannel,
referrer, aContentContext, shouldCloseWindow));
NS_ADDREF(*aStreamListener = childListener);
uint32_t reason = nsIHelperAppLauncherDialog::REASON_CANTHANDLE;
RefPtr<nsExternalAppHandler> handler = new nsExternalAppHandler(
nullptr, EmptyCString(), aContentContext, aWindowContext, this, fileName,
reason, aForceSave);
if (!handler) {
return NS_ERROR_OUT_OF_MEMORY;
}
childListener->SetHandler(handler);
return NS_OK;
}
NS_IMETHODIMP nsExternalHelperAppService::CreateListener(
const nsACString& aMimeContentType, nsIRequest* aRequest,
BrowsingContext* aContentContext, bool aForceSave,
nsIInterfaceRequestor* aWindowContext,
nsExternalAppHandler** aStreamListener) {
MOZ_ASSERT(!XRE_IsContentProcess());
nsAutoString fileName;
nsAutoCString fileExtension;
uint32_t reason = nsIHelperAppLauncherDialog::REASON_CANTHANDLE;
uint32_t contentDisposition = -1;
// Get the file extension and name that we will need later
nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
nsCOMPtr<nsIURI> uri;
int64_t contentLength = -1;
if (channel) {
channel->GetURI(getter_AddRefs(uri));
channel->GetContentLength(&contentLength);
channel->GetContentDisposition(&contentDisposition);
channel->GetContentDispositionFilename(fileName);
// Check if we have a POST request, in which case we don't want to use
// the url's extension
bool allowURLExt = !net::ChannelIsPost(channel);
// Check if we had a query string - we don't want to check the URL
// extension if a query is present in the URI
// If we already know we don't want to check the URL extension, don't
// bother checking the query
if (uri && allowURLExt) {
nsCOMPtr<nsIURL> url = do_QueryInterface(uri);
if (url) {
nsAutoCString query;
// We only care about the query for HTTP and HTTPS URLs
if (uri->SchemeIs("http") || uri->SchemeIs("https")) {
url->GetQuery(query);
}
// Only get the extension if the query is empty; if it isn't, then the
// extension likely belongs to a cgi script and isn't helpful
allowURLExt = query.IsEmpty();
}
}
// Extract name & extension
bool isAttachment = GetFilenameAndExtensionFromChannel(
channel, fileName, fileExtension, allowURLExt);
LOG(("Found extension '%s' (filename is '%s', handling attachment: %i)",
fileExtension.get(), NS_ConvertUTF16toUTF8(fileName).get(),
isAttachment));
if (isAttachment) {
reason = nsIHelperAppLauncherDialog::REASON_SERVERREQUEST;
}
}
LOG(("HelperAppService::DoContent: mime '%s', extension '%s'\n",
PromiseFlatCString(aMimeContentType).get(), fileExtension.get()));
// We get the mime service here even though we're the default implementation
// of it, so it's possible to override only the mime service and not need to
// reimplement the whole external helper app service itself.
nsCOMPtr<nsIMIMEService> mimeSvc(do_GetService(NS_MIMESERVICE_CONTRACTID));
NS_ENSURE_TRUE(mimeSvc, NS_ERROR_FAILURE);
// Try to find a mime object by looking at the mime type/extension
nsCOMPtr<nsIMIMEInfo> mimeInfo;
if (aMimeContentType.Equals(APPLICATION_GUESS_FROM_EXT,
nsCaseInsensitiveCStringComparator)) {
nsAutoCString mimeType;
if (!fileExtension.IsEmpty()) {
mimeSvc->GetFromTypeAndExtension(EmptyCString(), fileExtension,
getter_AddRefs(mimeInfo));
if (mimeInfo) {
mimeInfo->GetMIMEType(mimeType);
LOG(("OS-Provided mime type '%s' for extension '%s'\n", mimeType.get(),
fileExtension.get()));
}
}
if (fileExtension.IsEmpty() || mimeType.IsEmpty()) {
// Extension lookup gave us no useful match
mimeSvc->GetFromTypeAndExtension(
NS_LITERAL_CSTRING(APPLICATION_OCTET_STREAM), fileExtension,
getter_AddRefs(mimeInfo));
mimeType.AssignLiteral(APPLICATION_OCTET_STREAM);
}
if (channel) {
channel->SetContentType(mimeType);
}
// Don't overwrite SERVERREQUEST
if (reason == nsIHelperAppLauncherDialog::REASON_CANTHANDLE) {
reason = nsIHelperAppLauncherDialog::REASON_TYPESNIFFED;
}
} else {
mimeSvc->GetFromTypeAndExtension(aMimeContentType, fileExtension,
getter_AddRefs(mimeInfo));
}
LOG(("Type/Ext lookup found 0x%p\n", mimeInfo.get()));
// No mimeinfo -> we can't continue. probably OOM.
if (!mimeInfo) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aStreamListener = nullptr;
// We want the mimeInfo's primary extension to pass it to
// nsExternalAppHandler
nsAutoCString buf;
mimeInfo->GetPrimaryExtension(buf);
// NB: ExternalHelperAppParent depends on this listener always being an
// nsExternalAppHandler. If this changes, make sure to update that code.
nsExternalAppHandler* handler =
new nsExternalAppHandler(mimeInfo, buf, aContentContext, aWindowContext,
this, fileName, reason, aForceSave);
if (!handler) {
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ADDREF(*aStreamListener = handler);
return NS_OK;
}
NS_IMETHODIMP nsExternalHelperAppService::DoContent(
const nsACString& aMimeContentType, nsIRequest* aRequest,
nsIInterfaceRequestor* aContentContext, bool aForceSave,
nsIInterfaceRequestor* aWindowContext,
nsIStreamListener** aStreamListener) {
// Scripted interface requestors cannot return an instance of the
// (non-scriptable) nsPIDOMWindowOuter or nsPIDOMWindowInner interfaces, so
// get to the window via `nsIDOMWindow`. Unfortunately, at that point we
// don't know whether the thing we got is an inner or outer window, so have to
// work with either one.
RefPtr<BrowsingContext> bc;
nsCOMPtr<nsIDOMWindow> domWindow = do_GetInterface(aContentContext);
if (nsCOMPtr<nsPIDOMWindowOuter> outerWindow = do_QueryInterface(domWindow)) {
bc = outerWindow->GetBrowsingContext();
} else if (nsCOMPtr<nsPIDOMWindowInner> innerWindow =
do_QueryInterface(domWindow)) {
bc = innerWindow->GetBrowsingContext();
}
if (XRE_IsContentProcess()) {
return DoContentContentProcessHelper(aMimeContentType, aRequest, bc,
aForceSave, aWindowContext,
aStreamListener);
}
RefPtr<nsExternalAppHandler> handler;
nsresult rv = CreateListener(aMimeContentType, aRequest, bc, aForceSave,
aWindowContext, getter_AddRefs(handler));
handler.forget(aStreamListener);
return rv;
}
NS_IMETHODIMP nsExternalHelperAppService::ApplyDecodingForExtension(
const nsACString& aExtension, const nsACString& aEncodingType,
bool* aApplyDecoding) {
*aApplyDecoding = true;
uint32_t i;
for (i = 0; i < ArrayLength(nonDecodableExtensions); ++i) {
if (aExtension.LowerCaseEqualsASCII(
nonDecodableExtensions[i].mFileExtension) &&
aEncodingType.LowerCaseEqualsASCII(
nonDecodableExtensions[i].mMimeType)) {
*aApplyDecoding = false;
break;
}
}
return NS_OK;
}
nsresult nsExternalHelperAppService::GetFileTokenForPath(
const char16_t* aPlatformAppPath, nsIFile** aFile) {
nsDependentString platformAppPath(aPlatformAppPath);
// First, check if we have an absolute path
nsIFile* localFile = nullptr;
nsresult rv = NS_NewLocalFile(platformAppPath, true, &localFile);
if (NS_SUCCEEDED(rv)) {
*aFile = localFile;
bool exists;
if (NS_FAILED((*aFile)->Exists(&exists)) || !exists) {
NS_RELEASE(*aFile);
return NS_ERROR_FILE_NOT_FOUND;
}
return NS_OK;
}
// Second, check if file exists in mozilla program directory
rv = NS_GetSpecialDirectory(NS_XPCOM_CURRENT_PROCESS_DIR, aFile);
if (NS_SUCCEEDED(rv)) {
rv = (*aFile)->Append(platformAppPath);
if (NS_SUCCEEDED(rv)) {
bool exists = false;
rv = (*aFile)->Exists(&exists);
if (NS_SUCCEEDED(rv) && exists) return NS_OK;
}
NS_RELEASE(*aFile);
}
return NS_ERROR_NOT_AVAILABLE;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////
// begin external protocol service default implementation...
//////////////////////////////////////////////////////////////////////////////////////////////////////
NS_IMETHODIMP nsExternalHelperAppService::ExternalProtocolHandlerExists(
const char* aProtocolScheme, bool* aHandlerExists) {
nsCOMPtr<nsIHandlerInfo> handlerInfo;
nsresult rv = GetProtocolHandlerInfo(nsDependentCString(aProtocolScheme),
getter_AddRefs(handlerInfo));
if (NS_SUCCEEDED(rv)) {
// See if we have any known possible handler apps for this
nsCOMPtr<nsIMutableArray> possibleHandlers;
handlerInfo->GetPossibleApplicationHandlers(
getter_AddRefs(possibleHandlers));
uint32_t length;
possibleHandlers->GetLength(&length);
if (length) {
*aHandlerExists = true;
return NS_OK;
}
}
// if not, fall back on an os-based handler
return OSProtocolHandlerExists(aProtocolScheme, aHandlerExists);
}
NS_IMETHODIMP nsExternalHelperAppService::IsExposedProtocol(
const char* aProtocolScheme, bool* aResult) {
// check the per protocol setting first. it always takes precedence.
// if not set, then use the global setting.
nsAutoCString prefName("network.protocol-handler.expose.");
prefName += aProtocolScheme;
bool val;
if (NS_SUCCEEDED(Preferences::GetBool(prefName.get(), &val))) {
*aResult = val;
return NS_OK;
}
// by default, no protocol is exposed. i.e., by default all link clicks must
// go through the external protocol service. most applications override this
// default behavior.
*aResult = Preferences::GetBool("network.protocol-handler.expose-all", false);
return NS_OK;
}
static const char kExternalProtocolPrefPrefix[] =
"network.protocol-handler.external.";
static const char kExternalProtocolDefaultPref[] =
"network.protocol-handler.external-default";
NS_IMETHODIMP
nsExternalHelperAppService::LoadURI(nsIURI* aURI,
nsIPrincipal* aTriggeringPrincipal,
BrowsingContext* aBrowsingContext) {
NS_ENSURE_ARG_POINTER(aURI);
if (XRE_IsContentProcess()) {
mozilla::dom::ContentChild::GetSingleton()->SendLoadURIExternal(
aURI, aTriggeringPrincipal, aBrowsingContext);
return NS_OK;
}
nsAutoCString spec;
aURI->GetSpec(spec);
if (spec.Find("%00") != -1) return NS_ERROR_MALFORMED_URI;
spec.ReplaceSubstring("\"", "%22");
spec.ReplaceSubstring("`", "%60");
nsCOMPtr<nsIIOService> ios(do_GetIOService());
nsCOMPtr<nsIURI> uri;
nsresult rv = ios->NewURI(spec, nullptr, nullptr, getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString scheme;
uri->GetScheme(scheme);
if (scheme.IsEmpty()) return NS_OK; // must have a scheme
// Deny load if the prefs say to do so
nsAutoCString externalPref(kExternalProtocolPrefPrefix);
externalPref += scheme;
bool allowLoad = false;
if (NS_FAILED(Preferences::GetBool(externalPref.get(), &allowLoad))) {
// no scheme-specific value, check the default
if (NS_FAILED(
Preferences::GetBool(kExternalProtocolDefaultPref, &allowLoad))) {
return NS_OK; // missing default pref
}
}
if (!allowLoad) {
return NS_OK; // explicitly denied
}
// Now check if the principal is allowed to access the navigated context.
// We allow navigating subframes, even if not same-origin - non-external
// links can always navigate everywhere, so this is a minor additional
// restriction, only aiming to prevent some types of spoofing attacks
// from otherwise disjoint browsingcontext trees.
if (aBrowsingContext && aTriggeringPrincipal &&
!StaticPrefs::security_allow_disjointed_external_uri_loads() &&
!aTriggeringPrincipal->IsSystemPrincipal()) {
RefPtr<BrowsingContext> bc = aBrowsingContext;
WindowGlobalParent* wgp = bc->Canonical()->GetCurrentWindowGlobal();
bool foundAccessibleFrame = false;
// Also allow this load if the target is a toplevel BC and contains a
// non-web-controlled about:blank document
if (bc->IsTop() && !bc->HadOriginalOpener()) {
RefPtr<nsIURI> uri = wgp->GetDocumentURI();
foundAccessibleFrame =
uri && uri->GetSpecOrDefault().EqualsLiteral("about:blank");
}
while (wgp && !foundAccessibleFrame) {
foundAccessibleFrame =
aTriggeringPrincipal->Subsumes(wgp->DocumentPrincipal());
wgp = wgp->GetParentWindowContext();
}
if (!foundAccessibleFrame) {
return NS_OK; // deny the load.
}
}
nsCOMPtr<nsIHandlerInfo> handler;
rv = GetProtocolHandlerInfo(scheme, getter_AddRefs(handler));
NS_ENSURE_SUCCESS(rv, rv);
nsHandlerInfoAction preferredAction;
handler->GetPreferredAction(&preferredAction);
bool alwaysAsk = true;
handler->GetAlwaysAskBeforeHandling(&alwaysAsk);
// if we are not supposed to ask, and the preferred action is to use
// a helper app or the system default, we just launch the URI.
if (!alwaysAsk && (preferredAction == nsIHandlerInfo::useHelperApp ||
preferredAction == nsIHandlerInfo::useSystemDefault)) {
rv = handler->LaunchWithURI(uri, aBrowsingContext);
// We are not supposed to ask, but when file not found the user most likely
// uninstalled the application which handles the uri so we will continue
// by application chooser dialog.
if (rv != NS_ERROR_FILE_NOT_FOUND) {
return rv;
}
}
nsCOMPtr<nsIContentDispatchChooser> chooser =
do_CreateInstance("@mozilla.org/content-dispatch-chooser;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
return chooser->Ask(handler, uri, aTriggeringPrincipal, aBrowsingContext,
nsIContentDispatchChooser::REASON_CANNOT_HANDLE);
}
//////////////////////////////////////////////////////////////////////////////////////////////////////
// Methods related to deleting temporary files on exit
//////////////////////////////////////////////////////////////////////////////////////////////////////
/* static */
nsresult nsExternalHelperAppService::DeleteTemporaryFileHelper(
nsIFile* aTemporaryFile, nsCOMArray<nsIFile>& aFileList) {
bool isFile = false;
// as a safety measure, make sure the nsIFile is really a file and not a
// directory object.
aTemporaryFile->IsFile(&isFile);
if (!isFile) return NS_OK;
aFileList.AppendObject(aTemporaryFile);
return NS_OK;
}
NS_IMETHODIMP
nsExternalHelperAppService::DeleteTemporaryFileOnExit(nsIFile* aTemporaryFile) {
return DeleteTemporaryFileHelper(aTemporaryFile, mTemporaryFilesList);
}
NS_IMETHODIMP
nsExternalHelperAppService::DeleteTemporaryPrivateFileWhenPossible(
nsIFile* aTemporaryFile) {
return DeleteTemporaryFileHelper(aTemporaryFile, mTemporaryPrivateFilesList);
}
void nsExternalHelperAppService::ExpungeTemporaryFilesHelper(
nsCOMArray<nsIFile>& fileList) {
int32_t numEntries = fileList.Count();
nsIFile* localFile;
for (int32_t index = 0; index < numEntries; index++) {
localFile = fileList[index];
if (localFile) {
// First make the file writable, since the temp file is probably readonly.
localFile->SetPermissions(0600);
localFile->Remove(false);
}
}
fileList.Clear();
}
void nsExternalHelperAppService::ExpungeTemporaryFiles() {
ExpungeTemporaryFilesHelper(mTemporaryFilesList);
}
void nsExternalHelperAppService::ExpungeTemporaryPrivateFiles() {
ExpungeTemporaryFilesHelper(mTemporaryPrivateFilesList);
}
static const char kExternalWarningPrefPrefix[] =
"network.protocol-handler.warn-external.";
static const char kExternalWarningDefaultPref[] =
"network.protocol-handler.warn-external-default";
NS_IMETHODIMP
nsExternalHelperAppService::GetProtocolHandlerInfo(
const nsACString& aScheme, nsIHandlerInfo** aHandlerInfo) {
// XXX enterprise customers should be able to turn this support off with a
// single master pref (maybe use one of the "exposed" prefs here?)
bool exists;
nsresult rv = GetProtocolHandlerInfoFromOS(aScheme, &exists, aHandlerInfo);
if (NS_FAILED(rv)) {
// Either it knows nothing, or we ran out of memory
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIHandlerService> handlerSvc =
do_GetService(NS_HANDLERSERVICE_CONTRACTID);
if (handlerSvc) {
bool hasHandler = false;
(void)handlerSvc->Exists(*aHandlerInfo, &hasHandler);
if (hasHandler) {
rv = handlerSvc->FillHandlerInfo(*aHandlerInfo, EmptyCString());
if (NS_SUCCEEDED(rv)) return NS_OK;
}
}
return SetProtocolHandlerDefaults(*aHandlerInfo, exists);
}
NS_IMETHODIMP
nsExternalHelperAppService::SetProtocolHandlerDefaults(
nsIHandlerInfo* aHandlerInfo, bool aOSHandlerExists) {
// this type isn't in our database, so we've only got an OS default handler,
// if one exists
if (aOSHandlerExists) {
// we've got a default, so use it
aHandlerInfo->SetPreferredAction(nsIHandlerInfo::useSystemDefault);
// whether or not to ask the user depends on the warning preference
nsAutoCString scheme;
aHandlerInfo->GetType(scheme);
nsAutoCString warningPref(kExternalWarningPrefPrefix);
warningPref += scheme;
bool warn;
if (NS_FAILED(Preferences::GetBool(warningPref.get(), &warn))) {
// no scheme-specific value, check the default
warn = Preferences::GetBool(kExternalWarningDefaultPref, true);
}
aHandlerInfo->SetAlwaysAskBeforeHandling(warn);
} else {
// If no OS default existed, we set the preferred action to alwaysAsk.
// This really means not initialized (i.e. there's no available handler)
// to all the code...
aHandlerInfo->SetPreferredAction(nsIHandlerInfo::alwaysAsk);
}
return NS_OK;
}
// XPCOM profile change observer
NS_IMETHODIMP
nsExternalHelperAppService::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* someData) {
if (!strcmp(aTopic, "profile-before-change")) {
ExpungeTemporaryFiles();
} else if (!strcmp(aTopic, "last-pb-context-exited")) {
ExpungeTemporaryPrivateFiles();
}
return NS_OK;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////
// begin external app handler implementation
//////////////////////////////////////////////////////////////////////////////////////////////////////
NS_IMPL_ADDREF(nsExternalAppHandler)
NS_IMPL_RELEASE(nsExternalAppHandler)
NS_INTERFACE_MAP_BEGIN(nsExternalAppHandler)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIStreamListener)
NS_INTERFACE_MAP_ENTRY(nsIStreamListener)
NS_INTERFACE_MAP_ENTRY(nsIRequestObserver)
NS_INTERFACE_MAP_ENTRY(nsIHelperAppLauncher)
NS_INTERFACE_MAP_ENTRY(nsICancelable)
NS_INTERFACE_MAP_ENTRY(nsIBackgroundFileSaverObserver)
NS_INTERFACE_MAP_ENTRY(nsINamed)
NS_INTERFACE_MAP_END
nsExternalAppHandler::nsExternalAppHandler(
nsIMIMEInfo* aMIMEInfo, const nsACString& aTempFileExtension,
BrowsingContext* aBrowsingContext, nsIInterfaceRequestor* aWindowContext,
nsExternalHelperAppService* aExtProtSvc,
const nsAString& aSuggestedFilename, uint32_t aReason, bool aForceSave)
: mMimeInfo(aMIMEInfo),
mBrowsingContext(aBrowsingContext),
mWindowContext(aWindowContext),
mSuggestedFileName(aSuggestedFilename),
mForceSave(aForceSave),
mCanceled(false),
mStopRequestIssued(false),
mIsFileChannel(false),
mShouldCloseWindow(false),
mHandleInternally(false),
mReason(aReason),
mTempFileIsExecutable(false),
mTimeDownloadStarted(0),
mContentLength(-1),
mProgress(0),
mSaver(nullptr),
mDialogProgressListener(nullptr),
mTransfer(nullptr),
mRequest(nullptr),
mExtProtSvc(aExtProtSvc) {
// make sure the extention includes the '.'
if (!aTempFileExtension.IsEmpty() && aTempFileExtension.First() != '.')
mTempFileExtension = char16_t('.');
AppendUTF8toUTF16(aTempFileExtension, mTempFileExtension);
// Get mSuggestedFileName's current file extension.
nsAutoString originalFileExt;
int32_t pos = mSuggestedFileName.RFindChar('.');
if (pos != kNotFound) {
mSuggestedFileName.Right(originalFileExt,
mSuggestedFileName.Length() - pos);
}
// replace platform specific path separator and illegal characters to avoid
// any confusion.
// Try to keep the use of spaces or underscores in sync with the Downloads
// code sanitization in DownloadPaths.jsm
mSuggestedFileName.ReplaceChar(KNOWN_PATH_SEPARATORS, '_');
mSuggestedFileName.ReplaceChar(FILE_ILLEGAL_CHARACTERS, ' ');
mTempFileExtension.ReplaceChar(KNOWN_PATH_SEPARATORS, '_');
mTempFileExtension.ReplaceChar(FILE_ILLEGAL_CHARACTERS, ' ');
// Remove unsafe bidi characters which might have spoofing implications (bug
// 511521).
const char16_t unsafeBidiCharacters[] = {
char16_t(0x061c), // Arabic Letter Mark
char16_t(0x200e), // Left-to-Right Mark
char16_t(0x200f), // Right-to-Left Mark
char16_t(0x202a), // Left-to-Right Embedding
char16_t(0x202b), // Right-to-Left Embedding
char16_t(0x202c), // Pop Directional Formatting
char16_t(0x202d), // Left-to-Right Override
char16_t(0x202e), // Right-to-Left Override
char16_t(0x2066), // Left-to-Right Isolate
char16_t(0x2067), // Right-to-Left Isolate
char16_t(0x2068), // First Strong Isolate
char16_t(0x2069), // Pop Directional Isolate
char16_t(0)};
mSuggestedFileName.ReplaceChar(unsafeBidiCharacters, '_');
mTempFileExtension.ReplaceChar(unsafeBidiCharacters, '_');
// Remove trailing or leading spaces that we may have generated while
// sanitizing.
mSuggestedFileName.CompressWhitespace();
mTempFileExtension.CompressWhitespace();
// Append after removing trailing whitespaces from the name.
if (originalFileExt.FindCharInSet(
KNOWN_PATH_SEPARATORS FILE_ILLEGAL_CHARACTERS) != kNotFound) {
// The file extension contains invalid characters and using it would
// generate an unusable file, thus use mTempFileExtension instead.
mSuggestedFileName.Append(mTempFileExtension);
originalFileExt = mTempFileExtension;
}
// Make sure later we won't append mTempFileExtension if it's identical to
// the currently used file extension.
EnsureTempFileExtension(originalFileExt);
mBufferSize = Preferences::GetUint("network.buffer.cache.size", 4096);
}
nsExternalAppHandler::~nsExternalAppHandler() {
MOZ_ASSERT(!mSaver, "Saver should hold a reference to us until deleted");
}
void nsExternalAppHandler::DidDivertRequest(nsIRequest* request) {
MOZ_ASSERT(XRE_IsContentProcess(), "in child process");
// Remove our request from the child loadGroup
RetargetLoadNotifications(request);
}
NS_IMETHODIMP nsExternalAppHandler::SetWebProgressListener(
nsIWebProgressListener2* aWebProgressListener) {
// This is always called by nsHelperDlg.js. Go ahead and register the
// progress listener. At this point, we don't have mTransfer.
mDialogProgressListener = aWebProgressListener;
return NS_OK;
}
NS_IMETHODIMP nsExternalAppHandler::GetTargetFile(nsIFile** aTarget) {
if (mFinalFileDestination)
*aTarget = mFinalFileDestination;
else
*aTarget = mTempFile;
NS_IF_ADDREF(*aTarget);
return NS_OK;
}
NS_IMETHODIMP nsExternalAppHandler::GetTargetFileIsExecutable(bool* aExec) {
// Use the real target if it's been set
if (mFinalFileDestination) return mFinalFileDestination->IsExecutable(aExec);
// Otherwise, use the stored executable-ness of the temporary
*aExec = mTempFileIsExecutable;
return NS_OK;
}
NS_IMETHODIMP nsExternalAppHandler::GetTimeDownloadStarted(PRTime* aTime) {
*aTime = mTimeDownloadStarted;
return NS_OK;
}
NS_IMETHODIMP nsExternalAppHandler::GetContentLength(int64_t* aContentLength) {
*aContentLength = mContentLength;
return NS_OK;
}
NS_IMETHODIMP nsExternalAppHandler::GetBrowsingContextId(
uint64_t* aBrowsingContextId) {
*aBrowsingContextId = mBrowsingContext->Id();
return NS_OK;
}
void nsExternalAppHandler::RetargetLoadNotifications(nsIRequest* request) {
// we are going to run the downloading of the helper app in our own little
// docloader / load group context. so go ahead and force the creation of a
// load group and doc loader for us to use...
nsCOMPtr<nsIChannel> aChannel = do_QueryInterface(request);
if (!aChannel) return;
bool isPrivate = NS_UsePrivateBrowsing(aChannel);
nsCOMPtr<nsILoadGroup> oldLoadGroup;
aChannel->GetLoadGroup(getter_AddRefs(oldLoadGroup));
if (oldLoadGroup) {
oldLoadGroup->RemoveRequest(request, nullptr, NS_BINDING_RETARGETED);
}
aChannel->SetLoadGroup(nullptr);
aChannel->SetNotificationCallbacks(nullptr);
nsCOMPtr<nsIPrivateBrowsingChannel> pbChannel = do_QueryInterface(aChannel);
if (pbChannel) {
pbChannel->SetPrivate(isPrivate);
}
}
/**
* Make mTempFileExtension contain an extension exactly when its previous value
* is different from mSuggestedFileName's extension, so that it can be appended
* to mSuggestedFileName and form a valid, useful leaf name.
* This is required so that the (renamed) temporary file has the correct
* extension after downloading to make sure the OS will launch the application
* corresponding to the MIME type (which was used to calculate
* mTempFileExtension). This prevents a cgi-script named foobar.exe that
* returns application/zip from being named foobar.exe and executed as an
* executable file. It also blocks content that a web site might provide with a
* content-disposition header indicating filename="foobar.exe" from being
* downloaded to a file with extension .exe and executed.
*/
void nsExternalAppHandler::EnsureTempFileExtension(const nsString& aFileExt) {
// Make sure there is a mTempFileExtension (not "" or ".").
// Remember that mTempFileExtension will always have the leading "."
// (the check for empty is just to be safe).
if (mTempFileExtension.Length() > 1) {
// Now, compare fileExt to mTempFileExtension.
if (aFileExt.Equals(mTempFileExtension,
nsCaseInsensitiveStringComparator)) {
// Matches -> mTempFileExtension can be empty
mTempFileExtension.Truncate();
}
}
}
nsresult nsExternalAppHandler::SetUpTempFile(nsIChannel* aChannel) {
// First we need to try to get the destination directory for the temporary
// file.
nsresult rv = GetDownloadDirectory(getter_AddRefs(mTempFile));
NS_ENSURE_SUCCESS(rv, rv);
// At this point, we do not have a filename for the temp file. For security
// purposes, this cannot be predictable, so we must use a cryptographic
// quality PRNG to generate one.
// We will request raw random bytes, and transform that to a base64 string,
// as all characters from the base64 set are acceptable for filenames. For
// each three bytes of random data, we will get four bytes of ASCII. Request
// a bit more, to be safe, and truncate to the length we want in the end.
const uint32_t wantedFileNameLength = 8;
const uint32_t requiredBytesLength =
static_cast<uint32_t>((wantedFileNameLength + 1) / 4 * 3);
nsCOMPtr<nsIRandomGenerator> rg =
do_GetService("@mozilla.org/security/random-generator;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
uint8_t* buffer;
rv = rg->GenerateRandomBytes(requiredBytesLength, &buffer);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString tempLeafName;
nsDependentCSubstring randomData(reinterpret_cast<const char*>(buffer),
requiredBytesLength);
rv = Base64Encode(randomData, tempLeafName);
free(buffer);
buffer = nullptr;
NS_ENSURE_SUCCESS(rv, rv);
tempLeafName.Truncate(wantedFileNameLength);
// Base64 characters are alphanumeric (a-zA-Z0-9) and '+' and '/', so we need
// to replace illegal characters -- notably '/'
tempLeafName.ReplaceChar(KNOWN_PATH_SEPARATORS FILE_ILLEGAL_CHARACTERS, '_');
// now append our extension.
nsAutoCString ext;
mMimeInfo->GetPrimaryExtension(ext);
if (!ext.IsEmpty()) {
ext.ReplaceChar(KNOWN_PATH_SEPARATORS FILE_ILLEGAL_CHARACTERS, '_');
if (ext.First() != '.') tempLeafName.Append('.');
tempLeafName.Append(ext);
}
// We need to temporarily create a dummy file with the correct
// file extension to determine the executable-ness, so do this before adding
// the extra .part extension.
nsCOMPtr<nsIFile> dummyFile;
rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(dummyFile));
NS_ENSURE_SUCCESS(rv, rv);
// Set the file name without .part
rv = dummyFile->Append(NS_ConvertUTF8toUTF16(tempLeafName));
NS_ENSURE_SUCCESS(rv, rv);
rv = dummyFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
NS_ENSURE_SUCCESS(rv, rv);
// Store executable-ness then delete
dummyFile->IsExecutable(&mTempFileIsExecutable);
dummyFile->Remove(false);
// Add an additional .part to prevent the OS from running this file in the
// default application.
tempLeafName.AppendLiteral(".part");
rv = mTempFile->Append(NS_ConvertUTF8toUTF16(tempLeafName));
// make this file unique!!!
NS_ENSURE_SUCCESS(rv, rv);
rv = mTempFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
NS_ENSURE_SUCCESS(rv, rv);
// Now save the temp leaf name, minus the ".part" bit, so we can use it later.
// This is a bit broken in the case when createUnique actually had to append
// some numbers, because then we now have a filename like foo.bar-1.part and
// we'll end up with foo.bar-1.bar as our final filename if we end up using
// this. But the other options are all bad too.... Ideally we'd have a way
// to tell createUnique to put its unique marker before the extension that
// comes before ".part" or something.
rv = mTempFile->GetLeafName(mTempLeafName);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(StringEndsWith(mTempLeafName, NS_LITERAL_STRING(".part")),
NS_ERROR_UNEXPECTED);
// Strip off the ".part" from mTempLeafName
mTempLeafName.Truncate(mTempLeafName.Length() - ArrayLength(".part") + 1);
MOZ_ASSERT(!mSaver, "Output file initialization called more than once!");
mSaver =
do_CreateInstance(NS_BACKGROUNDFILESAVERSTREAMLISTENER_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
rv = mSaver->SetObserver(this);
if (NS_FAILED(rv)) {
mSaver = nullptr;
return rv;
}
rv = mSaver->EnableSha256();
NS_ENSURE_SUCCESS(rv, rv);
rv = mSaver->EnableSignatureInfo();
NS_ENSURE_SUCCESS(rv, rv);
LOG(("Enabled hashing and signature verification"));
rv = mSaver->SetTarget(mTempFile, false);
NS_ENSURE_SUCCESS(rv, rv);
return rv;
}
void nsExternalAppHandler::MaybeApplyDecodingForExtension(
nsIRequest* aRequest) {
MOZ_ASSERT(aRequest);
nsCOMPtr<nsIEncodedChannel> encChannel = do_QueryInterface(aRequest);
if (!encChannel) {
return;
}
// Turn off content encoding conversions if needed
bool applyConversion = true;
// First, check to see if conversion is already disabled. If so, we
// have nothing to do here.
encChannel->GetApplyConversion(&applyConversion);
if (!applyConversion) {
return;
}
nsCOMPtr<nsIURL> sourceURL(do_QueryInterface(mSourceUrl));
if (sourceURL) {
nsAutoCString extension;
sourceURL->GetFileExtension(extension);
if (!extension.IsEmpty()) {
nsCOMPtr<nsIUTF8StringEnumerator> encEnum;
encChannel->GetContentEncodings(getter_AddRefs(encEnum));
if (encEnum) {
bool hasMore;
nsresult rv = encEnum->HasMore(&hasMore);
if (NS_SUCCEEDED(rv) && hasMore) {
nsAutoCString encType;
rv = encEnum->GetNext(encType);
if (NS_SUCCEEDED(rv) && !encType.IsEmpty()) {
MOZ_ASSERT(mExtProtSvc);
mExtProtSvc->ApplyDecodingForExtension(extension, encType,
&applyConversion);
}
}
}
}
}
encChannel->SetApplyConversion(applyConversion);
}
already_AddRefed<nsIInterfaceRequestor>
nsExternalAppHandler::GetDialogParent() {
nsCOMPtr<nsIInterfaceRequestor> dialogParent = mWindowContext;
if (!dialogParent && mBrowsingContext) {
dialogParent = do_QueryInterface(mBrowsingContext->GetDOMWindow());
}
if (!dialogParent && mBrowsingContext && XRE_IsParentProcess()) {
RefPtr<Element> element = mBrowsingContext->Top()->GetEmbedderElement();
if (element) {
dialogParent = do_QueryInterface(element->OwnerDoc()->GetWindow());
}
}
return dialogParent.forget();
}
NS_IMETHODIMP nsExternalAppHandler::OnStartRequest(nsIRequest* request) {
MOZ_ASSERT(request, "OnStartRequest without request?");
// Set mTimeDownloadStarted here as the download has already started and
// we want to record the start time before showing the filepicker.
mTimeDownloadStarted = PR_Now();
mRequest = request;
nsCOMPtr<nsIChannel> aChannel = do_QueryInterface(request);
nsresult rv;
nsCOMPtr<nsIFileChannel> fileChan(do_QueryInterface(request));
mIsFileChannel = fileChan != nullptr;
if (!mIsFileChannel) {
// It's possible that this request came from the child process and the
// file channel actually lives there. If this returns true, then our
// mSourceUrl will be an nsIFileURL anyway.
nsCOMPtr<dom::nsIExternalHelperAppParent> parent(
do_QueryInterface(request));
mIsFileChannel = parent && parent->WasFileChannel();
}
// Get content length
if (aChannel) {
aChannel->GetContentLength(&mContentLength);
}
if (mBrowsingContext) {
mMaybeCloseWindowHelper = new MaybeCloseWindowHelper(mBrowsingContext);
mMaybeCloseWindowHelper->SetShouldCloseWindow(mShouldCloseWindow);
nsCOMPtr<nsIPropertyBag2> props(do_QueryInterface(request, &rv));
// Determine whether a new window was opened specifically for this request
if (props) {
bool tmp = false;
if (NS_SUCCEEDED(props->GetPropertyAsBool(
NS_LITERAL_STRING("docshell.newWindowTarget"), &tmp))) {
mMaybeCloseWindowHelper->SetShouldCloseWindow(tmp);
}
}
}
// Now get the URI
if (aChannel) {
aChannel->GetURI(getter_AddRefs(mSourceUrl));
}
// retarget all load notifications to our docloader instead of the original
// window's docloader...
RetargetLoadNotifications(request);
// Close the underlying DOMWindow if it was opened specifically for the
// download. We don't run this in the content process, since we have
// an instance running in the parent as well, which will handle this
// if needed.
if (!XRE_IsContentProcess() && mMaybeCloseWindowHelper) {
mBrowsingContext = mMaybeCloseWindowHelper->MaybeCloseWindow();
}
// In an IPC setting, we're allowing the child process, here, to make
// decisions about decoding the channel (e.g. decompression). It will
// still forward the decoded (uncompressed) data back to the parent.
// Con: Uncompressed data means more IPC overhead.
// Pros: ExternalHelperAppParent doesn't need to implement nsIEncodedChannel.
// Parent process doesn't need to expect CPU time on decompression.
MaybeApplyDecodingForExtension(aChannel);
// At this point, the child process has done everything it can usefully do
// for OnStartRequest.
if (XRE_IsContentProcess()) {
return NS_OK;
}
rv = SetUpTempFile(aChannel);
if (NS_FAILED(rv)) {
nsresult transferError = rv;
rv = CreateFailedTransfer();
if (NS_FAILED(rv)) {
LOG(
("Failed to create transfer to report failure."
"Will fallback to prompter!"));
}
mCanceled = true;
request->Cancel(transferError);
nsAutoString path;
if (mTempFile) mTempFile->GetPath(path);
SendStatusChange(kWriteError, transferError, request, path);
return NS_OK;
}
// Inform channel it is open on behalf of a download to throttle it during
// page loads and prevent its caching.
nsCOMPtr<nsIHttpChannelInternal> httpInternal = do_QueryInterface(aChannel);
if (httpInternal) {
rv = httpInternal->SetChannelIsForDownload(true);
MOZ_ASSERT(NS_SUCCEEDED(rv));
}
// now that the temp file is set up, find out if we need to invoke a dialog
// asking the user what they want us to do with this content...
// We can get here for three reasons: "can't handle", "sniffed type", or
// "server sent content-disposition:attachment". In the first case we want
// to honor the user's "always ask" pref; in the other two cases we want to
// honor it only if the default action is "save". Opening attachments in
// helper apps by default breaks some websites (especially if the attachment
// is one part of a multipart document). Opening sniffed content in helper
// apps by default introduces security holes that we'd rather not have.
// So let's find out whether the user wants to be prompted. If he does not,
// check mReason and the preferred action to see what we should do.
bool alwaysAsk = true;
mMimeInfo->GetAlwaysAskBeforeHandling(&alwaysAsk);
nsAutoCString MIMEType;
mMimeInfo->GetMIMEType(MIMEType);
if (alwaysAsk) {
// But we *don't* ask if this mimeInfo didn't come from
// our user configuration datastore and the user has said
// at some point in the distant past that they don't
// want to be asked. The latter fact would have been
// stored in pref strings back in the old days.
bool mimeTypeIsInDatastore = false;
nsCOMPtr<nsIHandlerService> handlerSvc =
do_GetService(NS_HANDLERSERVICE_CONTRACTID);
if (handlerSvc) {
handlerSvc->Exists(mMimeInfo, &mimeTypeIsInDatastore);
}
if (!handlerSvc || !mimeTypeIsInDatastore) {
if (!GetNeverAskFlagFromPref(NEVER_ASK_FOR_SAVE_TO_DISK_PREF,
MIMEType.get())) {
// Don't need to ask after all.
alwaysAsk = false;
// Make sure action matches pref (save to disk).
mMimeInfo->SetPreferredAction(nsIMIMEInfo::saveToDisk);
} else if (!GetNeverAskFlagFromPref(NEVER_ASK_FOR_OPEN_FILE_PREF,
MIMEType.get())) {
// Don't need to ask after all.
alwaysAsk = false;
}
}
} else if (MIMEType.EqualsLiteral("text/plain")) {
nsAutoCString ext;
mMimeInfo->GetPrimaryExtension(ext);
// If people are sending us ApplicationReputation-eligible files with
// text/plain mimetypes, enforce asking the user what to do.
if (!ext.IsEmpty()) {
nsAutoCString dummyFileName("f");
if (ext.First() != '.') {
dummyFileName.Append(".");
}
ext.ReplaceChar(KNOWN_PATH_SEPARATORS FILE_ILLEGAL_CHARACTERS, '_');
nsCOMPtr<nsIApplicationReputationService> appRep =
components::ApplicationReputation::Service();
appRep->IsBinary(dummyFileName + ext, &alwaysAsk);
}
}
int32_t action = nsIMIMEInfo::saveToDisk;
mMimeInfo->GetPreferredAction(&action);
// OK, now check why we're here
if (!alwaysAsk && mReason != nsIHelperAppLauncherDialog::REASON_CANTHANDLE) {
// Force asking if we're not saving. See comment back when we fetched the
// alwaysAsk boolean for details.
alwaysAsk = (action != nsIMIMEInfo::saveToDisk);
}
// If we're not asking, check we actually know what to do:
if (!alwaysAsk) {
alwaysAsk = action != nsIMIMEInfo::saveToDisk &&
action != nsIMIMEInfo::useHelperApp &&
action != nsIMIMEInfo::useSystemDefault;
}
// if we were told that we _must_ save to disk without asking, all the stuff
// before this is irrelevant; override it
if (mForceSave) {
alwaysAsk = false;
action = nsIMIMEInfo::saveToDisk;
}
if (alwaysAsk) {
// Display the dialog
mDialog = do_CreateInstance(NS_HELPERAPPLAUNCHERDLG_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
// this will create a reference cycle (the dialog holds a reference to us as
// nsIHelperAppLauncher), which will be broken in Cancel or CreateTransfer.
nsCOMPtr<nsIInterfaceRequestor> dialogParent = GetDialogParent();
rv = mDialog->Show(this, dialogParent, mReason);
// what do we do if the dialog failed? I guess we should call Cancel and
// abort the load....
} else {
// We need to do the save/open immediately, then.
#ifdef XP_WIN
/* We need to see whether the file we've got here could be
* executable. If it could, we had better not try to open it!
* We can skip this check, though, if we have a setting to open in a
* helper app.
* This code mirrors the code in
* nsExternalAppHandler::LaunchWithApplication so that what we
* test here is as close as possible to what will really be
* happening if we decide to execute
*/
nsCOMPtr<nsIHandlerApp> prefApp;
mMimeInfo->GetPreferredApplicationHandler(getter_AddRefs(prefApp));
if (action != nsIMIMEInfo::useHelperApp || !prefApp) {
nsCOMPtr<nsIFile> fileToTest;
GetTargetFile(getter_AddRefs(fileToTest));
if (fileToTest) {
bool isExecutable;
rv = fileToTest->IsExecutable(&isExecutable);
if (NS_FAILED(rv) ||
isExecutable) { // checking NS_FAILED, because paranoia is good
action = nsIMIMEInfo::saveToDisk;
}
} else { // Paranoia is good here too, though this really should not
// happen
NS_WARNING(
"GetDownloadInfo returned a null file after the temp file has been "
"set up! ");
action = nsIMIMEInfo::saveToDisk;
}
}
#endif
if (action == nsIMIMEInfo::useHelperApp ||
action == nsIMIMEInfo::useSystemDefault) {
rv = LaunchWithApplication(mHandleInternally);
} else {
rv = PromptForSaveDestination();
}
}
return NS_OK;
}
// Convert error info into proper message text and send OnStatusChange
// notification to the dialog progress listener or nsITransfer implementation.
void nsExternalAppHandler::SendStatusChange(ErrorType type, nsresult rv,
nsIRequest* aRequest,
const nsString& path) {
const char* msgId = nullptr;
switch (rv) {
case NS_ERROR_OUT_OF_MEMORY:
// No memory
msgId = "noMemory";
break;
case NS_ERROR_FILE_DISK_FULL:
case NS_ERROR_FILE_NO_DEVICE_SPACE:
// Out of space on target volume.
msgId = "diskFull";
break;
case NS_ERROR_FILE_READ_ONLY:
// Attempt to write to read/only file.
msgId = "readOnly";
break;
case NS_ERROR_FILE_ACCESS_DENIED:
if (type == kWriteError) {
// Attempt to write without sufficient permissions.
#if defined(ANDROID)
// On Android this means the SD card is present but
// unavailable (read-only).
msgId = "SDAccessErrorCardReadOnly";
#else
msgId = "accessError";
#endif
} else {
msgId = "launchError";
}
break;
case NS_ERROR_FILE_NOT_FOUND:
case NS_ERROR_FILE_TARGET_DOES_NOT_EXIST:
case NS_ERROR_FILE_UNRECOGNIZED_PATH:
// Helper app not found, let's verify this happened on launch
if (type == kLaunchError) {
msgId = "helperAppNotFound";
break;
}
#if defined(ANDROID)
else if (type == kWriteError) {
// On Android this means the SD card is missing (not in
// SD slot).
msgId = "SDAccessErrorCardMissing";
break;
}
#endif
[[fallthrough]];
default:
// Generic read/write/launch error message.
switch (type) {
case kReadError:
msgId = "readError";
break;
case kWriteError:
msgId = "writeError";
break;
case kLaunchError:
msgId = "launchError";
break;
}
break;
}
MOZ_LOG(
nsExternalHelperAppService::mLog, LogLevel::Error,
("Error: %s, type=%i, listener=0x%p, transfer=0x%p, rv=0x%08" PRIX32 "\n",
msgId, type, mDialogProgressListener.get(), mTransfer.get(),
static_cast<uint32_t>(rv)));
MOZ_LOG(nsExternalHelperAppService::mLog, LogLevel::Error,
(" path='%s'\n", NS_ConvertUTF16toUTF8(path).get()));
// Get properties file bundle and extract status string.
nsCOMPtr<nsIStringBundleService> stringService =
mozilla::services::GetStringBundleService();
if (stringService) {
nsCOMPtr<nsIStringBundle> bundle;
if (NS_SUCCEEDED(stringService->CreateBundle(
"chrome://global/locale/nsWebBrowserPersist.properties",
getter_AddRefs(bundle)))) {
nsAutoString msgText;
AutoTArray<nsString, 1> strings = {path};
if (NS_SUCCEEDED(bundle->FormatStringFromName(msgId, strings, msgText))) {
if (mDialogProgressListener) {
// We have a listener, let it handle the error.
mDialogProgressListener->OnStatusChange(
nullptr, (type == kReadError) ? aRequest : nullptr, rv,
msgText.get());
} else if (mTransfer) {
mTransfer->OnStatusChange(nullptr,
(type == kReadError) ? aRequest : nullptr,
rv, msgText.get());
} else if (XRE_IsParentProcess()) {
// We don't have a listener. Simply show the alert ourselves.
nsCOMPtr<nsIInterfaceRequestor> dialogParent = GetDialogParent();
nsresult qiRv;
nsCOMPtr<nsIPrompt> prompter(do_GetInterface(dialogParent, &qiRv));
nsAutoString title;
bundle->FormatStringFromName("title", strings, title);
MOZ_LOG(
nsExternalHelperAppService::mLog, LogLevel::Debug,
("mBrowsingContext=0x%p, prompter=0x%p, qi rv=0x%08" PRIX32
", title='%s', msg='%s'",
mBrowsingContext.get(), prompter.get(),
static_cast<uint32_t>(qiRv), NS_ConvertUTF16toUTF8(title).get(),
NS_ConvertUTF16toUTF8(msgText).get()));
// If we didn't have a prompter we will try and get a window
// instead, get it's docshell and use it to alert the user.
if (!prompter) {
nsCOMPtr<nsPIDOMWindowOuter> window(do_GetInterface(dialogParent));
if (!window || !window->GetDocShell()) {
return;
}
prompter = do_GetInterface(window->GetDocShell(), &qiRv);
MOZ_LOG(nsExternalHelperAppService::mLog, LogLevel::Debug,
("No prompter from mBrowsingContext, using DocShell, "
"window=0x%p, docShell=0x%p, "
"prompter=0x%p, qi rv=0x%08" PRIX32,
window.get(), window->GetDocShell(), prompter.get(),
static_cast<uint32_t>(qiRv)));
// If we still don't have a prompter, there's nothing else we
// can do so just return.
if (!prompter) {
MOZ_LOG(nsExternalHelperAppService::mLog, LogLevel::Error,
("No prompter from DocShell, no way to alert user"));
return;
}
}
// We should always have a prompter at this point.
prompter->Alert(title.get(), msgText.get());
}
}
}
}
}
NS_IMETHODIMP
nsExternalAppHandler::OnDataAvailable(nsIRequest* request,
nsIInputStream* inStr,
uint64_t sourceOffset, uint32_t count) {
nsresult rv = NS_OK;
// first, check to see if we've been canceled....
if (mCanceled || !mSaver) {
// then go cancel our underlying channel too
return request->Cancel(NS_BINDING_ABORTED);
}
// read the data out of the stream and write it to the temp file.
if (count > 0) {
mProgress += count;
nsCOMPtr<nsIStreamListener> saver = do_QueryInterface(mSaver);
rv = saver->OnDataAvailable(request, inStr, sourceOffset, count);
if (NS_SUCCEEDED(rv)) {
// Send progress notification.
if (mTransfer) {
mTransfer->OnProgressChange64(nullptr, request, mProgress,
mContentLength, mProgress,
mContentLength);
}
} else {
// An error occurred, notify listener.
nsAutoString tempFilePath;
if (mTempFile) {
mTempFile->GetPath(tempFilePath);
}
SendStatusChange(kReadError, rv, request, tempFilePath);
// Cancel the download.
Cancel(rv);
}
}
return rv;
}
NS_IMETHODIMP nsExternalAppHandler::OnStopRequest(nsIRequest* request,
nsresult aStatus) {
LOG(
("nsExternalAppHandler::OnStopRequest\n"
" mCanceled=%d, mTransfer=0x%p, aStatus=0x%08" PRIX32 "\n",
mCanceled, mTransfer.get(), static_cast<uint32_t>(aStatus)));
mStopRequestIssued = true;
// Cancel if the request did not complete successfully.
if (!mCanceled && NS_FAILED(aStatus)) {
// Send error notification.
nsAutoString tempFilePath;
if (mTempFile) mTempFile->GetPath(tempFilePath);
SendStatusChange(kReadError, aStatus, request, tempFilePath);
Cancel(aStatus);
}
// first, check to see if we've been canceled....
if (mCanceled || !mSaver) {
return NS_OK;
}
return mSaver->Finish(NS_OK);
}
NS_IMETHODIMP
nsExternalAppHandler::OnTargetChange(nsIBackgroundFileSaver* aSaver,
nsIFile* aTarget) {
return NS_OK;
}
NS_IMETHODIMP
nsExternalAppHandler::OnSaveComplete(nsIBackgroundFileSaver* aSaver,
nsresult aStatus) {
LOG(
("nsExternalAppHandler::OnSaveComplete\n"
" aSaver=0x%p, aStatus=0x%08" PRIX32 ", mCanceled=%d, mTransfer=0x%p\n",
aSaver, static_cast<uint32_t>(aStatus), mCanceled, mTransfer.get()));
if (!mCanceled) {
// Save the hash and signature information
(void)mSaver->GetSha256Hash(mHash);
(void)mSaver->GetSignatureInfo(mSignatureInfo);
// Free the reference that the saver keeps on us, even if we couldn't get
// the hash.
mSaver = nullptr;
// Save the redirect information.
nsCOMPtr<nsIChannel> channel = do_QueryInterface(mRequest);
if (channel) {
nsCOMPtr<nsILoadInfo> loadInfo = channel->LoadInfo();
nsresult rv = NS_OK;
nsCOMPtr<nsIMutableArray> redirectChain =
do_CreateInstance(NS_ARRAY_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
LOG(("nsExternalAppHandler: Got %zu redirects\n",
loadInfo->RedirectChain().Length()));
for (nsIRedirectHistoryEntry* entry : loadInfo->RedirectChain()) {
redirectChain->AppendElement(entry);
}
mRedirects = redirectChain;
}
if (NS_FAILED(aStatus)) {
nsAutoString path;
mTempFile->GetPath(path);
// It may happen when e10s is enabled that there will be no transfer
// object available to communicate status as expected by the system.
// Let's try and create a temporary transfer object to take care of this
// for us, we'll fall back to using the prompt service if we absolutely
// have to.
if (!mTransfer) {
// We don't care if this fails.
CreateFailedTransfer();
}
SendStatusChange(kWriteError, aStatus, nullptr, path);
if (!mCanceled) Cancel(aStatus);
return NS_OK;
}
}
// Notify the transfer object that we are done if the user has chosen an
// action. If the user hasn't chosen an action, the progress listener
// (nsITransfer) will be notified in CreateTransfer.
if (mTransfer) {
NotifyTransfer(aStatus);
}
return NS_OK;
}
void nsExternalAppHandler::NotifyTransfer(nsresult aStatus) {
MOZ_ASSERT(NS_IsMainThread(), "Must notify on main thread");
MOZ_ASSERT(mTransfer, "We must have an nsITransfer");
LOG(("Notifying progress listener"));
if (NS_SUCCEEDED(aStatus)) {
(void)mTransfer->SetSha256Hash(mHash);
(void)mTransfer->SetSignatureInfo(mSignatureInfo);
(void)mTransfer->SetRedirects(mRedirects);
(void)mTransfer->OnProgressChange64(
nullptr, nullptr, mProgress, mContentLength, mProgress, mContentLength);
}
(void)mTransfer->OnStateChange(nullptr, nullptr,
nsIWebProgressListener::STATE_STOP |
nsIWebProgressListener::STATE_IS_REQUEST |
nsIWebProgressListener::STATE_IS_NETWORK,
aStatus);
// This nsITransfer object holds a reference to us (we are its observer), so
// we need to release the reference to break a reference cycle (and therefore
// to prevent leaking). We do this even if the previous calls failed.
mTransfer = nullptr;
}
NS_IMETHODIMP nsExternalAppHandler::GetMIMEInfo(nsIMIMEInfo** aMIMEInfo) {
*aMIMEInfo = mMimeInfo;
NS_ADDREF(*aMIMEInfo);
return NS_OK;
}
NS_IMETHODIMP nsExternalAppHandler::GetSource(nsIURI** aSourceURI) {
NS_ENSURE_ARG(aSourceURI);
*aSourceURI = mSourceUrl;
NS_IF_ADDREF(*aSourceURI);
return NS_OK;
}
NS_IMETHODIMP nsExternalAppHandler::GetSuggestedFileName(
nsAString& aSuggestedFileName) {
aSuggestedFileName = mSuggestedFileName;
return NS_OK;
}
nsresult nsExternalAppHandler::CreateTransfer() {
LOG(("nsExternalAppHandler::CreateTransfer"));
MOZ_ASSERT(NS_IsMainThread(), "Must create transfer on main thread");
// We are back from the helper app dialog (where the user chooses to save or
// open), but we aren't done processing the load. in this case, throw up a
// progress dialog so the user can see what's going on.
// Also, release our reference to mDialog. We don't need it anymore, and we
// need to break the reference cycle.
mDialog = nullptr;
if (!mDialogProgressListener) {
NS_WARNING("The dialog should nullify the dialog progress listener");
}
nsresult rv;
// We must be able to create an nsITransfer object. If not, it doesn't matter
// much that we can't launch the helper application or save to disk. Work on
// a local copy rather than mTransfer until we know we succeeded, to make it
// clearer that this function is re-entrant.
nsCOMPtr<nsITransfer> transfer =
do_CreateInstance(NS_TRANSFER_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
// Initialize the download
nsCOMPtr<nsIURI> target;
rv = NS_NewFileURI(getter_AddRefs(target), mFinalFileDestination);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIChannel> channel = do_QueryInterface(mRequest);
if (mBrowsingContext) {
rv = transfer->InitWithBrowsingContext(
mSourceUrl, target, EmptyString(), mMimeInfo, mTimeDownloadStarted,
mTempFile, this, channel && NS_UsePrivateBrowsing(channel),
mBrowsingContext, mHandleInternally);
} else {
rv = transfer->Init(mSourceUrl, target, EmptyString(), mMimeInfo,
mTimeDownloadStarted, mTempFile, this,
channel && NS_UsePrivateBrowsing(channel));
}
NS_ENSURE_SUCCESS(rv, rv);
// If we were cancelled since creating the transfer, just return. It is
// always ok to return NS_OK if we are cancelled. Callers of this function
// must call Cancel if CreateTransfer fails, but there's no need to cancel
// twice.
if (mCanceled) {
return NS_OK;
}
rv = transfer->OnStateChange(nullptr, mRequest,
nsIWebProgressListener::STATE_START |
nsIWebProgressListener::STATE_IS_REQUEST |
nsIWebProgressListener::STATE_IS_NETWORK,
NS_OK);
NS_ENSURE_SUCCESS(rv, rv);
if (mCanceled) {
return NS_OK;
}
mRequest = nullptr;
// Finally, save the transfer to mTransfer.
mTransfer = transfer;
transfer = nullptr;
// While we were bringing up the progress dialog, we actually finished
// processing the url. If that's the case then mStopRequestIssued will be
// true and OnSaveComplete has been called.
if (mStopRequestIssued && !mSaver && mTransfer) {
NotifyTransfer(NS_OK);
}
return rv;
}
nsresult nsExternalAppHandler::CreateFailedTransfer() {
nsresult rv;
nsCOMPtr<nsITransfer> transfer =
do_CreateInstance(NS_TRANSFER_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
// If we don't have a download directory we're kinda screwed but it's OK
// we'll still report the error via the prompter.
nsCOMPtr<nsIFile> pseudoFile;
rv = GetDownloadDirectory(getter_AddRefs(pseudoFile), true);
NS_ENSURE_SUCCESS(rv, rv);
// Append the default suggested filename. If the user restarts the transfer
// we will re-trigger a filename check anyway to ensure that it is unique.
rv = pseudoFile->Append(mSuggestedFileName);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIURI> pseudoTarget;
rv = NS_NewFileURI(getter_AddRefs(pseudoTarget), pseudoFile);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIChannel> channel = do_QueryInterface(mRequest);
if (mBrowsingContext) {
rv = transfer->InitWithBrowsingContext(
mSourceUrl, pseudoTarget, EmptyString(), mMimeInfo,
mTimeDownloadStarted, nullptr, this,
channel && NS_UsePrivateBrowsing(channel), mBrowsingContext,
mHandleInternally);
} else {
rv = transfer->Init(mSourceUrl, pseudoTarget, EmptyString(), mMimeInfo,
mTimeDownloadStarted, nullptr, this,
channel && NS_UsePrivateBrowsing(channel));
}
NS_ENSURE_SUCCESS(rv, rv);
// Our failed transfer is ready.
mTransfer = std::move(transfer);
return NS_OK;
}
nsresult nsExternalAppHandler::SaveDestinationAvailable(nsIFile* aFile) {
if (aFile)
ContinueSave(aFile);
else
Cancel(NS_BINDING_ABORTED);
return NS_OK;
}
void nsExternalAppHandler::RequestSaveDestination(
const nsString& aDefaultFile, const nsString& aFileExtension) {
// Display the dialog
// XXX Convert to use file picker? No, then embeddors could not do any sort of
// "AutoDownload" w/o showing a prompt
nsresult rv = NS_OK;
if (!mDialog) {
// Get helper app launcher dialog.
mDialog = do_CreateInstance(NS_HELPERAPPLAUNCHERDLG_CONTRACTID, &rv);
if (rv != NS_OK) {
Cancel(NS_BINDING_ABORTED);
return;
}
}
// we want to explicitly unescape aDefaultFile b4 passing into the dialog. we
// can't unescape it because the dialog is implemented by a JS component which
// doesn't have a window so no unescape routine is defined...
// Now, be sure to keep |this| alive, and the dialog
// If we don't do this, users that close the helper app dialog while the file
// picker is up would cause Cancel() to be called, and the dialog would be
// released, which would release this object too, which would crash.
// See Bug 249143
RefPtr<nsExternalAppHandler> kungFuDeathGrip(this);
nsCOMPtr<nsIHelperAppLauncherDialog> dlg(mDialog);
nsCOMPtr<nsIInterfaceRequestor> dialogParent = GetDialogParent();
rv = dlg->PromptForSaveToFileAsync(this, dialogParent, aDefaultFile.get(),
aFileExtension.get(), mForceSave);
if (NS_FAILED(rv)) {
Cancel(NS_BINDING_ABORTED);
}
}
// PromptForSaveDestination should only be called by the helper app dialog which
// allows the user to say launch with application or save to disk.
NS_IMETHODIMP nsExternalAppHandler::PromptForSaveDestination() {
if (mCanceled) return NS_OK;
mMimeInfo->SetPreferredAction(nsIMIMEInfo::saveToDisk);
if (mSuggestedFileName.IsEmpty()) {
RequestSaveDestination(mTempLeafName, mTempFileExtension);
} else {
nsAutoString fileExt;
int32_t pos = mSuggestedFileName.RFindChar('.');
if (pos >= 0) {
mSuggestedFileName.Right(fileExt, mSuggestedFileName.Length() - pos);
}
if (fileExt.IsEmpty()) {
fileExt = mTempFileExtension;
}
RequestSaveDestination(mSuggestedFileName, fileExt);
}
return NS_OK;
}
nsresult nsExternalAppHandler::ContinueSave(nsIFile* aNewFileLocation) {
if (mCanceled) return NS_OK;
MOZ_ASSERT(aNewFileLocation, "Must be called with a non-null file");
nsresult rv = NS_OK;
nsCOMPtr<nsIFile> fileToUse = aNewFileLocation;
mFinalFileDestination = fileToUse;
// Move what we have in the final directory, but append .part
// to it, to indicate that it's unfinished. Do not call SetTarget on the
// saver if we are done (Finish has been called) but OnSaverComplete has not
// been called.
if (mFinalFileDestination && mSaver && !mStopRequestIssued) {
nsCOMPtr<nsIFile> movedFile;
mFinalFileDestination->Clone(getter_AddRefs(movedFile));
if (movedFile) {
// Get the old leaf name and append .part to it
nsAutoString name;
mFinalFileDestination->GetLeafName(name);
name.AppendLiteral(".part");
movedFile->SetLeafName(name);
rv = mSaver->SetTarget(movedFile, true);
if (NS_FAILED(rv)) {
nsAutoString path;
mTempFile->GetPath(path);
SendStatusChange(kWriteError, rv, nullptr, path);
Cancel(rv);
return NS_OK;
}
mTempFile = movedFile;
}
}
// The helper app dialog has told us what to do and we have a final file
// destination.
rv = CreateTransfer();
// If we fail to create the transfer, Cancel.
if (NS_FAILED(rv)) {
Cancel(rv);
return rv;
}
return NS_OK;
}
// LaunchWithApplication should only be called by the helper app dialog which
// allows the user to say launch with application or save to disk.
NS_IMETHODIMP nsExternalAppHandler::LaunchWithApplication(
bool aHandleInternally) {
if (mCanceled) return NS_OK;
mHandleInternally = aHandleInternally;
// Now check if the file is local, in which case we won't bother with saving
// it to a temporary directory and just launch it from where it is
nsCOMPtr<nsIFileURL> fileUrl(do_QueryInterface(mSourceUrl));
if (fileUrl && mIsFileChannel) {
Cancel(NS_BINDING_ABORTED);
nsCOMPtr<nsIFile> file;
nsresult rv = fileUrl->GetFile(getter_AddRefs(file));
if (NS_SUCCEEDED(rv)) {
rv = mMimeInfo->LaunchWithFile(file);
if (NS_SUCCEEDED(rv)) return NS_OK;
}
nsAutoString path;
if (file) file->GetPath(path);
// If we get here, an error happened
SendStatusChange(kLaunchError, rv, nullptr, path);
return rv;
}
// Now that the user has elected to launch the downloaded file with a helper
// app, we're justified in removing the 'salted' name. We'll rename to what
// was specified in mSuggestedFileName after the download is done prior to
// launching the helper app. So that any existing file of that name won't be
// overwritten we call CreateUnique(). Also note that we use the same
// directory as originally downloaded so the download can be renamed in place
// later.
nsCOMPtr<nsIFile> fileToUse;
(void)GetDownloadDirectory(getter_AddRefs(fileToUse));
if (mSuggestedFileName.IsEmpty()) {
// Keep using the leafname of the temp file, since we're just starting a
// helper
mSuggestedFileName = mTempLeafName;
}
#ifdef XP_WIN
fileToUse->Append(mSuggestedFileName + mTempFileExtension);
#else
fileToUse->Append(mSuggestedFileName);
#endif
nsresult rv = fileToUse->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
if (NS_SUCCEEDED(rv)) {
mFinalFileDestination = fileToUse;
// launch the progress window now that the user has picked the desired
// action.
rv = CreateTransfer();
if (NS_FAILED(rv)) {
Cancel(rv);
}
} else {
// Cancel the download and report an error. We do not want to end up in
// a state where it appears that we have a normal download that is
// pointing to a file that we did not actually create.
nsAutoString path;
mTempFile->GetPath(path);
SendStatusChange(kWriteError, rv, nullptr, path);
Cancel(rv);
}
return rv;
}
NS_IMETHODIMP nsExternalAppHandler::Cancel(nsresult aReason) {
NS_ENSURE_ARG(NS_FAILED(aReason));
if (mCanceled) {
return NS_OK;
}
mCanceled = true;
if (mSaver) {
// We are still writing to the target file. Give the saver a chance to
// close the target file, then notify the transfer object if necessary in
// the OnSaveComplete callback.
mSaver->Finish(aReason);
mSaver = nullptr;
} else {
if (mStopRequestIssued && mTempFile) {
// This branch can only happen when the user cancels the helper app dialog
// when the request has completed. The temp file has to be removed here,
// because mSaver has been released at that time with the temp file left.
(void)mTempFile->Remove(false);
}
// Notify the transfer object that the download has been canceled, if the
// user has already chosen an action and we didn't notify already.
if (mTransfer) {
NotifyTransfer(aReason);
}
}
// Break our reference cycle with the helper app dialog (set up in
// OnStartRequest)
mDialog = nullptr;
mRequest = nullptr;
// Release the listener, to break the reference cycle with it (we are the
// observer of the listener).
mDialogProgressListener = nullptr;
return NS_OK;
}
bool nsExternalAppHandler::GetNeverAskFlagFromPref(const char* prefName,
const char* aContentType) {
// Search the obsolete pref strings.
nsAutoCString prefCString;
Preferences::GetCString(prefName, prefCString);
if (prefCString.IsEmpty()) {
// Default is true, if not found in the pref string.
return true;
}
NS_UnescapeURL(prefCString);
nsACString::const_iterator start, end;
prefCString.BeginReading(start);
prefCString.EndReading(end);
return !CaseInsensitiveFindInReadable(nsDependentCString(aContentType), start,
end);
}
NS_IMETHODIMP
nsExternalAppHandler::GetName(nsACString& aName) {
aName.AssignLiteral("nsExternalAppHandler");
return NS_OK;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////
// The following section contains our nsIMIMEService implementation and related
// methods.
//
//////////////////////////////////////////////////////////////////////////////////////////////////////////////
// nsIMIMEService methods
NS_IMETHODIMP nsExternalHelperAppService::GetFromTypeAndExtension(
const nsACString& aMIMEType, const nsACString& aFileExt,
nsIMIMEInfo** _retval) {
MOZ_ASSERT(!aMIMEType.IsEmpty() || !aFileExt.IsEmpty(),
"Give me something to work with");
LOG(("Getting mimeinfo from type '%s' ext '%s'\n",
PromiseFlatCString(aMIMEType).get(),
PromiseFlatCString(aFileExt).get()));
*_retval = nullptr;
// OK... we need a type. Get one.
nsAutoCString typeToUse(aMIMEType);
if (typeToUse.IsEmpty()) {
nsresult rv = GetTypeFromExtension(aFileExt, typeToUse);
if (NS_FAILED(rv)) return NS_ERROR_NOT_AVAILABLE;
}
// We promise to only send lower case mime types to the OS
ToLowerCase(typeToUse);
// First, ask the OS for a mime info
bool found;
nsresult rv = GetMIMEInfoFromOS(typeToUse, aFileExt, &found, _retval);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
LOG(("OS gave back 0x%p - found: %i\n", *_retval, found));
// If we got no mimeinfo, something went wrong. Probably lack of memory.
if (!*_retval) return NS_ERROR_OUT_OF_MEMORY;
// The handler service can make up for bad mime types by checking the file
// extension. If the mime type is known (in extras or in the handler
// service), we stop it doing so by flipping this bool to true.
bool trustMIMEType = false;
// Check extras - not everything we support will be known by the OS store,
// unfortunately, and it may even miss some extensions that we know should
// be accepted. We only do this for non-octet-stream mimetypes, because
// our information for octet-stream would lead to us trying to open all such
// files as Binary file with exe, com or bin extension regardless of the
// real extension.
if (!typeToUse.Equals(APPLICATION_OCTET_STREAM,
nsCaseInsensitiveCStringComparator)) {
rv = FillMIMEInfoForMimeTypeFromExtras(typeToUse, !found, *_retval);
LOG(("Searched extras (by type), rv 0x%08" PRIX32 "\n",
static_cast<uint32_t>(rv)));
trustMIMEType = NS_SUCCEEDED(rv);
found = found || NS_SUCCEEDED(rv);
}
// Next, overwrite with generic description if the extension is PDF
// since the file format is supported by Firefox and we don't want
// other brands positioning themselves as the sole viewer for a system.
if (aFileExt.LowerCaseEqualsASCII("pdf") ||
aFileExt.LowerCaseEqualsASCII(".pdf")) {
nsCOMPtr<nsIStringBundleService> bundleService =
do_GetService(NS_STRINGBUNDLE_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIStringBundle> unknownContentTypeBundle;
rv = bundleService->CreateBundle(
"chrome://mozapps/locale/downloads/unknownContentType.properties",
getter_AddRefs(unknownContentTypeBundle));
if (NS_SUCCEEDED(rv)) {
nsAutoString pdfHandlerDescription;
rv = unknownContentTypeBundle->GetStringFromName("pdfHandlerDescription",
pdfHandlerDescription);
if (NS_SUCCEEDED(rv)) {
(*_retval)->SetDescription(pdfHandlerDescription);
}
}
}
// Now, let's see if we can find something in our datastore.
// This will not overwrite the OS information that interests us
// (i.e. default application, default app. description)
nsCOMPtr<nsIHandlerService> handlerSvc =
do_GetService(NS_HANDLERSERVICE_CONTRACTID);
if (handlerSvc) {
bool hasHandler = false;
(void)handlerSvc->Exists(*_retval, &hasHandler);
if (hasHandler) {
rv = handlerSvc->FillHandlerInfo(*_retval, EmptyCString());
LOG(("Data source: Via type: retval 0x%08" PRIx32 "\n",
static_cast<uint32_t>(rv)));
trustMIMEType = trustMIMEType || NS_SUCCEEDED(rv);
} else {
rv = NS_ERROR_NOT_AVAILABLE;
}
found = found || NS_SUCCEEDED(rv);
}
// If we still haven't found anything, try finding a match for
// an extension in extras first:
if (!found && !aFileExt.IsEmpty()) {
rv = FillMIMEInfoForExtensionFromExtras(aFileExt, *_retval);
LOG(("Searched extras (by ext), rv 0x%08" PRIX32 "\n",
static_cast<uint32_t>(rv)));
}
// Then check the handler service - but only do so if we really do not know
// the mimetype. This avoids overwriting good mimetype info with bad file
// extension info.
if ((!found || !trustMIMEType) && handlerSvc && !aFileExt.IsEmpty()) {
nsAutoCString overrideType;
rv = handlerSvc->GetTypeFromExtension(aFileExt, overrideType);
if (NS_SUCCEEDED(rv) && !overrideType.IsEmpty()) {
// We can't check handlerSvc->Exists() here, because we have a
// overideType. That's ok, it just results in some console noise.
// (If there's no handler for the override type, it throws)
rv = handlerSvc->FillHandlerInfo(*_retval, overrideType);
LOG(("Data source: Via ext: retval 0x%08" PRIx32 "\n",
static_cast<uint32_t>(rv)));
found = found || NS_SUCCEEDED(rv);
}
}
// If we still don't have a match, at least set the file description
// to `${aFileExt} File` if it's empty:
if (!found && !aFileExt.IsEmpty()) {
// XXXzpao This should probably be localized
nsAutoCString desc(aFileExt);
desc.AppendLiteral(" File");
(*_retval)->SetDescription(NS_ConvertASCIItoUTF16(desc));
LOG(("Falling back to 'File' file description\n"));
}
// Finally, check if we got a file extension and if yes, if it is an
// extension on the mimeinfo, in which case we want it to be the primary one
if (!aFileExt.IsEmpty()) {
bool matches = false;
(*_retval)->ExtensionExists(aFileExt, &matches);
LOG(("Extension '%s' matches mime info: %i\n",
PromiseFlatCString(aFileExt).get(), matches));
if (matches) (*_retval)->SetPrimaryExtension(aFileExt);
}
if (LOG_ENABLED()) {
nsAutoCString type;
(*_retval)->GetMIMEType(type);
nsAutoCString ext;
(*_retval)->GetPrimaryExtension(ext);
LOG(("MIME Info Summary: Type '%s', Primary Ext '%s'\n", type.get(),
ext.get()));
}
return NS_OK;
}
NS_IMETHODIMP
nsExternalHelperAppService::GetTypeFromExtension(const nsACString& aFileExt,
nsACString& aContentType) {
// OK. We want to try the following sources of mimetype information, in this
// order:
// 1. defaultMimeEntries array
// 2. OS-provided information
// 3. our "extras" array
// 4. Information from plugins
// 5. The "ext-to-type-mapping" category
// Note that, we are intentionally not looking at the handler service, because
// that can be affected by websites, which leads to undesired behavior.
// Early return if called with an empty extension parameter
if (aFileExt.IsEmpty()) {
return NS_ERROR_NOT_AVAILABLE;
}
// First of all, check our default entries
for (auto& entry : defaultMimeEntries) {
if (aFileExt.LowerCaseEqualsASCII(entry.mFileExtension)) {
aContentType = entry.mMimeType;
return NS_OK;
}
}
// Ask OS.
if (GetMIMETypeFromOSForExtension(aFileExt, aContentType)) {
return NS_OK;
}
// Check extras array.
bool found = GetTypeFromExtras(aFileExt, aContentType);
if (found) {
return NS_OK;
}
// Try the plugins
RefPtr<nsPluginHost> pluginHost = nsPluginHost::GetInst();
if (pluginHost &&
pluginHost->HavePluginForExtension(aFileExt, aContentType)) {
return NS_OK;
}
// Let's see if an extension added something
nsCOMPtr<nsICategoryManager> catMan(
do_GetService("@mozilla.org/categorymanager;1"));
if (catMan) {
// The extension in the category entry is always stored as lowercase
nsAutoCString lowercaseFileExt(aFileExt);
ToLowerCase(lowercaseFileExt);
// Read the MIME type from the category entry, if available
nsCString type;
nsresult rv =
catMan->GetCategoryEntry("ext-to-type-mapping", lowercaseFileExt, type);
if (NS_SUCCEEDED(rv)) {
aContentType = type;
return NS_OK;
}
}
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP nsExternalHelperAppService::GetPrimaryExtension(
const nsACString& aMIMEType, const nsACString& aFileExt,
nsACString& _retval) {
NS_ENSURE_ARG(!aMIMEType.IsEmpty());
nsCOMPtr<nsIMIMEInfo> mi;
nsresult rv =
GetFromTypeAndExtension(aMIMEType, aFileExt, getter_AddRefs(mi));
if (NS_FAILED(rv)) return rv;
return mi->GetPrimaryExtension(_retval);
}
NS_IMETHODIMP nsExternalHelperAppService::GetTypeFromURI(
nsIURI* aURI, nsACString& aContentType) {
NS_ENSURE_ARG_POINTER(aURI);
nsresult rv = NS_ERROR_NOT_AVAILABLE;
aContentType.Truncate();
// First look for a file to use. If we have one, we just use that.
nsCOMPtr<nsIFileURL> fileUrl = do_QueryInterface(aURI);
if (fileUrl) {
nsCOMPtr<nsIFile> file;
rv = fileUrl->GetFile(getter_AddRefs(file));
if (NS_SUCCEEDED(rv)) {
rv = GetTypeFromFile(file, aContentType);
if (NS_SUCCEEDED(rv)) {
// we got something!
return rv;
}
}
}
// Now try to get an nsIURL so we don't have to do our own parsing
nsCOMPtr<nsIURL> url = do_QueryInterface(aURI);
if (url) {
nsAutoCString ext;
rv = url->GetFileExtension(ext);
if (NS_FAILED(rv)) return rv;
if (ext.IsEmpty()) return NS_ERROR_NOT_AVAILABLE;
UnescapeFragment(ext, url, ext);
return GetTypeFromExtension(ext, aContentType);
}
// no url, let's give the raw spec a shot
nsAutoCString specStr;
rv = aURI->GetSpec(specStr);
if (NS_FAILED(rv)) return rv;
UnescapeFragment(specStr, aURI, specStr);
// find the file extension (if any)
int32_t extLoc = specStr.RFindChar('.');
int32_t specLength = specStr.Length();
if (-1 != extLoc && extLoc != specLength - 1 &&
// nothing over 20 chars long can be sanely considered an
// extension.... Dat dere would be just data.
specLength - extLoc < 20) {
return GetTypeFromExtension(Substring(specStr, extLoc + 1), aContentType);
}
// We found no information; say so.
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP nsExternalHelperAppService::GetTypeFromFile(
nsIFile* aFile, nsACString& aContentType) {
NS_ENSURE_ARG_POINTER(aFile);
nsresult rv;
// Get the Extension
nsAutoString fileName;
rv = aFile->GetLeafName(fileName);
if (NS_FAILED(rv)) return rv;
nsAutoCString fileExt;
if (!fileName.IsEmpty()) {
int32_t len = fileName.Length();
for (int32_t i = len; i >= 0; i--) {
if (fileName[i] == char16_t('.')) {
CopyUTF16toUTF8(Substring(fileName, i + 1), fileExt);
break;
}
}
}
if (fileExt.IsEmpty()) return NS_ERROR_FAILURE;
return GetTypeFromExtension(fileExt, aContentType);
}
nsresult nsExternalHelperAppService::FillMIMEInfoForMimeTypeFromExtras(
const nsACString& aContentType, bool aOverwriteDescription,
nsIMIMEInfo* aMIMEInfo) {
NS_ENSURE_ARG(aMIMEInfo);
NS_ENSURE_ARG(!aContentType.IsEmpty());
// Look for default entry with matching mime type.
nsAutoCString MIMEType(aContentType);
ToLowerCase(MIMEType);
for (auto entry : extraMimeEntries) {
if (MIMEType.Equals(entry.mMimeType)) {
// This is the one. Set attributes appropriately.
nsDependentCString extensions(entry.mFileExtensions);
nsACString::const_iterator start, end;
extensions.BeginReading(start);
extensions.EndReading(end);
while (start != end) {
nsACString::const_iterator cursor = start;
mozilla::Unused << FindCharInReadable(',', cursor, end);
aMIMEInfo->AppendExtension(Substring(start, cursor));
// If a comma was found, skip it for the next search.
start = cursor != end ? ++cursor : cursor;
}
nsAutoString desc;
aMIMEInfo->GetDescription(desc);
if (aOverwriteDescription || desc.IsEmpty()) {
aMIMEInfo->SetDescription(NS_ConvertASCIItoUTF16(entry.mDescription));
}
return NS_OK;
}
}
return NS_ERROR_NOT_AVAILABLE;
}
nsresult nsExternalHelperAppService::FillMIMEInfoForExtensionFromExtras(
const nsACString& aExtension, nsIMIMEInfo* aMIMEInfo) {
nsAutoCString type;
bool found = GetTypeFromExtras(aExtension, type);
if (!found) return NS_ERROR_NOT_AVAILABLE;
return FillMIMEInfoForMimeTypeFromExtras(type, true, aMIMEInfo);
}
bool nsExternalHelperAppService::GetTypeFromExtras(const nsACString& aExtension,
nsACString& aMIMEType) {
NS_ASSERTION(!aExtension.IsEmpty(), "Empty aExtension parameter!");
// Look for default entry with matching extension.
nsDependentCString::const_iterator start, end, iter;
int32_t numEntries = ArrayLength(extraMimeEntries);
for (int32_t index = 0; index < numEntries; index++) {
nsDependentCString extList(extraMimeEntries[index].mFileExtensions);
extList.BeginReading(start);
extList.EndReading(end);
iter = start;
while (start != end) {
FindCharInReadable(',', iter, end);
if (Substring(start, iter)
.Equals(aExtension, nsCaseInsensitiveCStringComparator)) {
aMIMEType = extraMimeEntries[index].mMimeType;
return true;
}
if (iter != end) {
++iter;
}
start = iter;
}
}
return false;
}
bool nsExternalHelperAppService::GetMIMETypeFromOSForExtension(
const nsACString& aExtension, nsACString& aMIMEType) {
bool found = false;
nsCOMPtr<nsIMIMEInfo> mimeInfo;
nsresult rv = GetMIMEInfoFromOS(EmptyCString(), aExtension, &found,
getter_AddRefs(mimeInfo));
return NS_SUCCEEDED(rv) && found && mimeInfo &&
NS_SUCCEEDED(mimeInfo->GetMIMEType(aMIMEType));
}
nsresult nsExternalHelperAppService::GetMIMEInfoFromOS(
const nsACString& aMIMEType, const nsACString& aFileExt, bool* aFound,
nsIMIMEInfo** aMIMEInfo) {
*aMIMEInfo = nullptr;
*aFound = false;
return NS_ERROR_NOT_IMPLEMENTED;
}
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