The Tor Browser: uriloader/exthandler/nsMIMEInfoImpl.cpp@97036ab72558 (annotated)

uriloader/exthandler/nsMIMEInfoImpl.cpp@97036ab72558 (annotated)

uriloader/exthandler/nsMIMEInfoImpl.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim:set ts=2 sw=2 sts=2 et: */
 /* 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 "nsMIMEInfoImpl.h"
 #include "nsXPIDLString.h"
 #include "nsReadableUtils.h"
 #include "nsStringEnumerator.h"
 #include "nsIFile.h"
 #include "nsIFileURL.h"
 #include "nsEscape.h"
 #include "nsNetUtil.h"
 #include "nsIURILoader.h"
 #include "nsCURILoader.h"
 // nsISupports methods
 NS_IMPL_ADDREF(nsMIMEInfoBase)
 NS_IMPL_RELEASE(nsMIMEInfoBase)
 NS_INTERFACE_MAP_BEGIN(nsMIMEInfoBase)
     NS_INTERFACE_MAP_ENTRY(nsIHandlerInfo)
     // This is only an nsIMIMEInfo if it's a MIME handler.
     NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIMIMEInfo, mClass == eMIMEInfo)
     NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIHandlerInfo)
 NS_INTERFACE_MAP_END_THREADSAFE
 // nsMIMEInfoImpl methods
 // Constructors for a MIME handler.
 nsMIMEInfoBase::nsMIMEInfoBase(const char *aMIMEType) :
     mSchemeOrType(aMIMEType),
     mClass(eMIMEInfo),
     mPreferredAction(nsIMIMEInfo::saveToDisk),
     mAlwaysAskBeforeHandling(true)
 {
 }
 nsMIMEInfoBase::nsMIMEInfoBase(const nsACString& aMIMEType) :
     mSchemeOrType(aMIMEType),
     mClass(eMIMEInfo),
     mPreferredAction(nsIMIMEInfo::saveToDisk),
     mAlwaysAskBeforeHandling(true)
 {
 }
 // Constructor for a handler that lets the caller specify whether this is a
 // MIME handler or a protocol handler.  In the long run, these will be distinct
 // classes (f.e. nsMIMEInfo and nsProtocolInfo), but for now we reuse this class
 // for both and distinguish between the two kinds of handlers via the aClass
 // argument to this method, which can be either eMIMEInfo or eProtocolInfo.
 nsMIMEInfoBase::nsMIMEInfoBase(const nsACString& aType, HandlerClass aClass) :
     mSchemeOrType(aType),
     mClass(aClass),
     mPreferredAction(nsIMIMEInfo::saveToDisk),
     mAlwaysAskBeforeHandling(true)
 {
 }
 nsMIMEInfoBase::~nsMIMEInfoBase()
 {
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetFileExtensions(nsIUTF8StringEnumerator** aResult)
 {
   return NS_NewUTF8StringEnumerator(aResult, &mExtensions, this);
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::ExtensionExists(const nsACString& aExtension, bool *_retval)
 {
     NS_ASSERTION(!aExtension.IsEmpty(), "no extension");
     bool found = false;
     uint32_t extCount = mExtensions.Length();
     if (extCount < 1) return NS_OK;
     for (uint8_t i=0; i < extCount; i++) {
         const nsCString& ext = mExtensions[i];
         if (ext.Equals(aExtension, nsCaseInsensitiveCStringComparator())) {
             found = true;
             break;
         }
     }
     *_retval = found;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetPrimaryExtension(nsACString& _retval)
 {
     if (!mExtensions.Length())
       return NS_ERROR_NOT_INITIALIZED;
     _retval = mExtensions[0];
     return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::SetPrimaryExtension(const nsACString& aExtension)
 {
   NS_ASSERTION(!aExtension.IsEmpty(), "no extension");
   uint32_t extCount = mExtensions.Length();
   uint8_t i;
   bool found = false;
   for (i=0; i < extCount; i++) {
     const nsCString& ext = mExtensions[i];
     if (ext.Equals(aExtension, nsCaseInsensitiveCStringComparator())) {
       found = true;
       break;
     }
   }
   if (found) {
     mExtensions.RemoveElementAt(i);
   }
   mExtensions.InsertElementAt(0, aExtension);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::AppendExtension(const nsACString& aExtension)
 {
   mExtensions.AppendElement(aExtension);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetType(nsACString& aType)
 {
     if (mSchemeOrType.IsEmpty())
         return NS_ERROR_NOT_INITIALIZED;
     aType = mSchemeOrType;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetMIMEType(nsACString& aMIMEType)
 {
     if (mSchemeOrType.IsEmpty())
         return NS_ERROR_NOT_INITIALIZED;
     aMIMEType = mSchemeOrType;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetDescription(nsAString& aDescription)
 {
     aDescription = mDescription;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::SetDescription(const nsAString& aDescription)
 {
     mDescription = aDescription;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::Equals(nsIMIMEInfo *aMIMEInfo, bool *_retval)
 {
     if (!aMIMEInfo) return NS_ERROR_NULL_POINTER;
     nsAutoCString type;
     nsresult rv = aMIMEInfo->GetMIMEType(type);
     if (NS_FAILED(rv)) return rv;
     *_retval = mSchemeOrType.Equals(type);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::SetFileExtensions(const nsACString& aExtensions)
 {
     mExtensions.Clear();
     nsCString extList( aExtensions );
     int32_t breakLocation = -1;
     while ( (breakLocation= extList.FindChar(',') )!= -1)
     {
         mExtensions.AppendElement(Substring(extList.get(), extList.get() + breakLocation));
         extList.Cut(0, breakLocation+1 );
     }
     if ( !extList.IsEmpty() )
         mExtensions.AppendElement( extList );
     return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetDefaultDescription(nsAString& aDefaultDescription)
 {
   aDefaultDescription = mDefaultAppDescription;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetPreferredApplicationHandler(nsIHandlerApp ** aPreferredAppHandler)
 {
   *aPreferredAppHandler = mPreferredApplication;
   NS_IF_ADDREF(*aPreferredAppHandler);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::SetPreferredApplicationHandler(nsIHandlerApp * aPreferredAppHandler)
 {
   mPreferredApplication = aPreferredAppHandler;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetPossibleApplicationHandlers(nsIMutableArray ** aPossibleAppHandlers)
 {
   if (!mPossibleApplications)
     mPossibleApplications = do_CreateInstance(NS_ARRAY_CONTRACTID);
   if (!mPossibleApplications)
     return NS_ERROR_OUT_OF_MEMORY;
   *aPossibleAppHandlers = mPossibleApplications;
   NS_IF_ADDREF(*aPossibleAppHandlers);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetPreferredAction(nsHandlerInfoAction * aPreferredAction)
 {
   *aPreferredAction = mPreferredAction;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::SetPreferredAction(nsHandlerInfoAction aPreferredAction)
 {
   mPreferredAction = aPreferredAction;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetAlwaysAskBeforeHandling(bool * aAlwaysAsk)
 {
   *aAlwaysAsk = mAlwaysAskBeforeHandling;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::SetAlwaysAskBeforeHandling(bool aAlwaysAsk)
 {
   mAlwaysAskBeforeHandling = aAlwaysAsk;
   return NS_OK;
 }
 /* static */
 nsresult
 nsMIMEInfoBase::GetLocalFileFromURI(nsIURI *aURI, nsIFile **aFile)
 {
   nsresult rv;
   nsCOMPtr<nsIFileURL> fileUrl = do_QueryInterface(aURI, &rv);
   if (NS_FAILED(rv)) {
     return rv;
   }
   nsCOMPtr<nsIFile> file;
   rv = fileUrl->GetFile(getter_AddRefs(file));
   if (NS_FAILED(rv)) {
     return rv;
   }
   file.forget(aFile);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::LaunchWithFile(nsIFile* aFile)
 {
   nsresult rv;
   // it doesn't make any sense to call this on protocol handlers
   NS_ASSERTION(mClass == eMIMEInfo,
                "nsMIMEInfoBase should have mClass == eMIMEInfo");
   if (mPreferredAction == useSystemDefault) {
     return LaunchDefaultWithFile(aFile);
   }
   if (mPreferredAction == useHelperApp) {
     if (!mPreferredApplication)
       return NS_ERROR_FILE_NOT_FOUND;
     // at the moment, we only know how to hand files off to local handlers
     nsCOMPtr<nsILocalHandlerApp> localHandler =
       do_QueryInterface(mPreferredApplication, &rv);
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIFile> executable;
     rv = localHandler->GetExecutable(getter_AddRefs(executable));
     NS_ENSURE_SUCCESS(rv, rv);
     nsAutoCString path;
     aFile->GetNativePath(path);
     return LaunchWithIProcess(executable, path);
   }
   return NS_ERROR_INVALID_ARG;
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::LaunchWithURI(nsIURI* aURI,
                               nsIInterfaceRequestor* aWindowContext)
 {
   // for now, this is only being called with protocol handlers; that
   // will change once we get to more general registerContentHandler
   // support
   NS_ASSERTION(mClass == eProtocolInfo,
                "nsMIMEInfoBase should be a protocol handler");
   if (mPreferredAction == useSystemDefault) {
     return LoadUriInternal(aURI);
   }
   if (mPreferredAction == useHelperApp) {
     if (!mPreferredApplication)
       return NS_ERROR_FILE_NOT_FOUND;
     return mPreferredApplication->LaunchWithURI(aURI, aWindowContext);
   }
   return NS_ERROR_INVALID_ARG;
 }
 void
 nsMIMEInfoBase::CopyBasicDataTo(nsMIMEInfoBase* aOther)
 {
   aOther->mSchemeOrType = mSchemeOrType;
   aOther->mDefaultAppDescription = mDefaultAppDescription;
   aOther->mExtensions = mExtensions;
 }
 /* static */
 already_AddRefed<nsIProcess>
 nsMIMEInfoBase::InitProcess(nsIFile* aApp, nsresult* aResult)
 {
   NS_ASSERTION(aApp, "Unexpected null pointer, fix caller");
   nsCOMPtr<nsIProcess> process = do_CreateInstance(NS_PROCESS_CONTRACTID,
                                                    aResult);
   if (NS_FAILED(*aResult))
     return nullptr;
   *aResult = process->Init(aApp);
   if (NS_FAILED(*aResult))
     return nullptr;
   return process.forget();
 }
 /* static */
 nsresult
 nsMIMEInfoBase::LaunchWithIProcess(nsIFile* aApp, const nsCString& aArg)
 {
   nsresult rv;
   nsCOMPtr<nsIProcess> process = InitProcess(aApp, &rv);
   if (NS_FAILED(rv))
     return rv;
   const char *string = aArg.get();
   return process->Run(false, &string, 1);
 }
 /* static */
 nsresult
 nsMIMEInfoBase::LaunchWithIProcess(nsIFile* aApp, const nsString& aArg)
 {
   nsresult rv;
   nsCOMPtr<nsIProcess> process = InitProcess(aApp, &rv);
   if (NS_FAILED(rv))
     return rv;
   const char16_t *string = aArg.get();
   return process->Runw(false, &string, 1);
 }
 // nsMIMEInfoImpl implementation
 NS_IMETHODIMP
 nsMIMEInfoImpl::GetDefaultDescription(nsAString& aDefaultDescription)
 {
   if (mDefaultAppDescription.IsEmpty() && mDefaultApplication) {
     // Don't want to cache this, just in case someone resets the app
     // without changing the description....
     mDefaultApplication->GetLeafName(aDefaultDescription);
   } else {
     aDefaultDescription = mDefaultAppDescription;
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMIMEInfoImpl::GetHasDefaultHandler(bool * _retval)
 {
   *_retval = !mDefaultAppDescription.IsEmpty();
   if (mDefaultApplication) {
     bool exists;
     *_retval = NS_SUCCEEDED(mDefaultApplication->Exists(&exists)) && exists;
   }
   return NS_OK;
 }
 nsresult
 nsMIMEInfoImpl::LaunchDefaultWithFile(nsIFile* aFile)
 {
   if (!mDefaultApplication)
     return NS_ERROR_FILE_NOT_FOUND;
   nsAutoCString nativePath;
   aFile->GetNativePath(nativePath);
   return LaunchWithIProcess(mDefaultApplication, nativePath);
 }
 NS_IMETHODIMP
 nsMIMEInfoBase::GetPossibleLocalHandlers(nsIArray **_retval)
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }

The Tor Browser / annotate

uriloader/exthandler/nsMIMEInfoImpl.cpp@97036ab72558 (annotated)

uriloader/exthandler/nsMIMEInfoImpl.cpp