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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 */
#ifndef SubstitutingProtocolHandler_h___
#define SubstitutingProtocolHandler_h___
#include "nsISubstitutingProtocolHandler.h"
#include "nsTHashMap.h"
#include "nsStandardURL.h"
#include "nsJARURI.h"
#include "mozilla/chrome/RegistryMessageUtils.h"
#include "mozilla/Maybe.h"
#include "mozilla/RWLock.h"
class nsIIOService;
namespace mozilla {
namespace net {
// Base class for resource://-like substitution protocols.
// If you add a new protocol, make sure to change nsChromeRegistryChrome
// to properly invoke CollectSubstitutions at the right time.
class SubstitutingProtocolHandler {
SubstitutingProtocolHandler(const char* aScheme, uint32_t aFlags,
bool aEnforceFileOrJar = true);
explicit SubstitutingProtocolHandler(const char* aScheme);
bool HasSubstitution(const nsACString& aRoot) const {
AutoReadLock lock(const_cast<RWLock&>(mSubstitutionsLock));
return mSubstitutions.Get(aRoot, nullptr);
nsresult NewURI(const nsACString& aSpec, const char* aCharset,
nsIURI* aBaseURI, nsIURI** aResult);
[[nodiscard]] nsresult CollectSubstitutions(
nsTArray<SubstitutionMapping>& aMappings);
virtual ~SubstitutingProtocolHandler() = default;
void ConstructInternal();
[[nodiscard]] nsresult SendSubstitution(const nsACString& aRoot,
nsIURI* aBaseURI, uint32_t aFlags);
nsresult GetSubstitutionFlags(const nsACString& root, uint32_t* flags);
// Override this in the subclass to try additional lookups after checking
// mSubstitutions.
[[nodiscard]] virtual nsresult GetSubstitutionInternal(
const nsACString& aRoot, nsIURI** aResult, uint32_t* aFlags) {
*aResult = nullptr;
*aFlags = 0;
// Override this in the subclass to check for special case when resolving URIs
// _before_ checking substitutions.
[[nodiscard]] virtual bool ResolveSpecialCases(const nsACString& aHost,
const nsACString& aPath,
const nsACString& aPathname,
nsACString& aResult) {
return false;
// This method should only return true if GetSubstitutionInternal would
// return the RESOLVE_JAR_URI flag.
[[nodiscard]] virtual bool MustResolveJAR(const nsACString& aRoot) {
return false;
// Override this in the subclass to check for special case when opening
// channels.
[[nodiscard]] virtual nsresult SubstituteChannel(nsIURI* uri,
nsILoadInfo* aLoadInfo,
nsIChannel** result) {
return NS_OK;
nsIIOService* IOService() { return mIOService; }
struct SubstitutionEntry {
nsCOMPtr<nsIURI> baseURI;
uint32_t flags = 0;
// Notifies all observers that a new substitution from |aRoot| to
// |aBaseURI| has been set/installed for this protocol handler.
void NotifyObservers(const nsACString& aRoot, nsIURI* aBaseURI);
nsCString mScheme;
Maybe<uint32_t> mFlags;
RWLock mSubstitutionsLock;
nsTHashMap<nsCStringHashKey, SubstitutionEntry> mSubstitutions;
nsCOMPtr<nsIIOService> mIOService;
// Returns a SubstitutingJARURI if |aUrl| maps to a |jar:| URI,
// otherwise will return |aURL|
nsresult ResolveJARURI(nsIURL* aURL, nsIURI** aResult);
// In general, we expect the principal of a document loaded from a
// substituting URI to be a content principal for that URI (rather than
// a principal for whatever is underneath). However, this only works if
// the protocol handler for the underlying URI doesn't set an explicit
// owner (which chrome:// does, for example). So we want to require that
// substituting URIs only map to other URIs of the same type, or to
// file:// and jar:// URIs.
// Enforcing this for ye olde resource:// URIs could carry compat risks, so
// we just try to enforce it on new protocols going forward.
bool mEnforceFileOrJar;
} // namespace net
} // namespace mozilla
#endif /* SubstitutingProtocolHandler_h___ */