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-rw-r--r--netwerk/protocol/res/SubstitutingProtocolHandler.h129
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diff --git a/netwerk/protocol/res/SubstitutingProtocolHandler.h b/netwerk/protocol/res/SubstitutingProtocolHandler.h
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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 http://mozilla.org/MPL/2.0/. */
+
+#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 {
+ public:
+ explicit SubstitutingProtocolHandler(const char* aScheme,
+ bool aEnforceFileOrJar = true);
+
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(SubstitutingProtocolHandler);
+ NS_DECL_NON_VIRTUAL_NSIPROTOCOLHANDLER;
+ NS_DECL_NON_VIRTUAL_NSISUBSTITUTINGPROTOCOLHANDLER;
+
+ 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);
+
+ protected:
+ 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;
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ // 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; }
+
+ private:
+ 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;
+
+ RWLock mSubstitutionsLock;
+ nsTHashMap<nsCStringHashKey, SubstitutionEntry> mSubstitutions
+ MOZ_GUARDED_BY(mSubstitutionsLock);
+ 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___ */