import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

chrome/nsChromeRegistryChrome.cpp

@@ -0,0 +1,991 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sts=2 sw=2 et 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/. */
+
+#include "mozilla/dom/ContentParent.h"
+#include "RegistryMessageUtils.h"
+#include "nsResProtocolHandler.h"
+
+#include "nsChromeRegistryChrome.h"
+
+#if defined(XP_WIN)
+#include <windows.h>
+#elif defined(XP_MACOSX)
+#include <CoreServices/CoreServices.h>
+#endif
+
+#include "nsArrayEnumerator.h"
+#include "nsComponentManager.h"
+#include "nsEnumeratorUtils.h"
+#include "nsNetUtil.h"
+#include "nsStringEnumerator.h"
+#include "nsTextFormatter.h"
+#include "nsXPCOMCIDInternal.h"
+
+#include "mozilla/LookAndFeel.h"
+#include "mozilla/Unused.h"
+
+#include "nsICommandLine.h"
+#include "nsILocaleService.h"
+#include "nsIObserverService.h"
+#include "nsIPrefBranch.h"
+#include "nsIPrefService.h"
+#include "mozilla/Preferences.h"
+#include "nsIResProtocolHandler.h"
+#include "nsIScriptError.h"
+#include "nsIXPConnect.h"
+#include "nsIXULRuntime.h"
+
+#define UILOCALE_CMD_LINE_ARG "UILocale"
+
+#define MATCH_OS_LOCALE_PREF "intl.locale.matchOS"
+#define SELECTED_LOCALE_PREF "general.useragent.locale"
+#define SELECTED_SKIN_PREF   "general.skins.selectedSkin"
+#define PACKAGE_OVERRIDE_BRANCH "chrome.override_package."
+
+using namespace mozilla;
+using mozilla::dom::ContentParent;
+using mozilla::dom::PContentParent;
+
+// We use a "best-fit" algorithm for matching locales and themes.
+// 1) the exact selected locale/theme
+// 2) (locales only) same language, different country
+//    e.g. en-GB is the selected locale, only en-US is available
+// 3) any available locale/theme
+
+/**
+ * Match the language-part of two lang-COUNTRY codes, hopefully but
+ * not guaranteed to be in the form ab-CD or abz-CD. "ab" should also
+ * work, any other garbage-in will produce undefined results as long
+ * as it does not crash.
+ */
+static bool
+LanguagesMatch(const nsACString& a, const nsACString& b)
+{
+  if (a.Length() < 2 || b.Length() < 2)
+    return false;
+
+  nsACString::const_iterator as, ae, bs, be;
+  a.BeginReading(as);
+  a.EndReading(ae);
+  b.BeginReading(bs);
+  b.EndReading(be);
+
+  while (*as == *bs) {
+    if (*as == '-')
+      return true;
+
+    ++as; ++bs;
+
+    // reached the end
+    if (as == ae && bs == be)
+      return true;
+
+    // "a" is short
+    if (as == ae)
+      return (*bs == '-');
+
+    // "b" is short
+    if (bs == be)
+      return (*as == '-');
+  }
+
+  return false;
+}
+
+nsChromeRegistryChrome::nsChromeRegistryChrome()
+  : mProfileLoaded(false)
+  , mDynamicRegistration(true)
+{
+}
+
+nsChromeRegistryChrome::~nsChromeRegistryChrome()
+{
+}
+
+nsresult
+nsChromeRegistryChrome::Init()
+{
+  nsresult rv = nsChromeRegistry::Init();
+  if (NS_FAILED(rv))
+    return rv;
+
+  mSelectedLocale = NS_LITERAL_CSTRING("en-US");
+  mSelectedSkin = NS_LITERAL_CSTRING("classic/1.0");
+
+  bool safeMode = false;
+  nsCOMPtr<nsIXULRuntime> xulrun (do_GetService(XULAPPINFO_SERVICE_CONTRACTID));
+  if (xulrun)
+    xulrun->GetInSafeMode(&safeMode);
+
+  nsCOMPtr<nsIPrefService> prefserv (do_GetService(NS_PREFSERVICE_CONTRACTID));
+  nsCOMPtr<nsIPrefBranch> prefs;
+
+  if (prefserv) {
+    if (safeMode) {
+      prefserv->GetDefaultBranch(nullptr, getter_AddRefs(prefs));
+    } else {
+      prefs = do_QueryInterface(prefserv);
+    }
+  }
+
+  if (!prefs) {
+    NS_WARNING("Could not get pref service!");
+  } else {
+    nsXPIDLCString provider;
+    rv = prefs->GetCharPref(SELECTED_SKIN_PREF, getter_Copies(provider));
+    if (NS_SUCCEEDED(rv))
+      mSelectedSkin = provider;
+
+    SelectLocaleFromPref(prefs);
+
+    rv = prefs->AddObserver(MATCH_OS_LOCALE_PREF, this, true);
+    rv = prefs->AddObserver(SELECTED_LOCALE_PREF, this, true);
+    rv = prefs->AddObserver(SELECTED_SKIN_PREF, this, true);
+  }
+
+  nsCOMPtr<nsIObserverService> obsService = mozilla::services::GetObserverService();
+  if (obsService) {
+    obsService->AddObserver(this, "command-line-startup", true);
+    obsService->AddObserver(this, "profile-initial-state", true);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsChromeRegistryChrome::CheckForOSAccessibility()
+{
+  int32_t useAccessibilityTheme =
+    LookAndFeel::GetInt(LookAndFeel::eIntID_UseAccessibilityTheme, 0);
+
+  if (useAccessibilityTheme) {
+    /* Set the skin to classic and remove pref observers */
+    if (!mSelectedSkin.EqualsLiteral("classic/1.0")) {
+      mSelectedSkin.AssignLiteral("classic/1.0");
+      RefreshSkins();
+    }
+
+    nsCOMPtr<nsIPrefBranch> prefs (do_GetService(NS_PREFSERVICE_CONTRACTID));
+    if (prefs) {
+      prefs->RemoveObserver(SELECTED_SKIN_PREF, this);
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsChromeRegistryChrome::GetLocalesForPackage(const nsACString& aPackage,
+                                       nsIUTF8StringEnumerator* *aResult)
+{
+  nsCString realpackage;
+  nsresult rv = OverrideLocalePackage(aPackage, realpackage);
+  if (NS_FAILED(rv))
+    return rv;
+
+  nsTArray<nsCString> *a = new nsTArray<nsCString>;
+  if (!a)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  PackageEntry* entry;
+  if (mPackagesHash.Get(realpackage, &entry)) {
+    entry->locales.EnumerateToArray(a);
+  }
+
+  rv = NS_NewAdoptingUTF8StringEnumerator(aResult, a);
+  if (NS_FAILED(rv))
+    delete a;
+
+  return rv;
+}
+
+static nsresult
+getUILangCountry(nsACString& aUILang)
+{
+  nsresult rv;
+
+  nsCOMPtr<nsILocaleService> localeService = do_GetService(NS_LOCALESERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoString uiLang;
+  rv = localeService->GetLocaleComponentForUserAgent(uiLang);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  CopyUTF16toUTF8(uiLang, aUILang);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsChromeRegistryChrome::IsLocaleRTL(const nsACString& package, bool *aResult)
+{
+  *aResult = false;
+
+  nsAutoCString locale;
+  GetSelectedLocale(package, false, locale);
+  if (locale.Length() < 2)
+    return NS_OK;
+
+  *aResult = GetDirectionForLocale(locale);
+  return NS_OK;
+}
+
+nsresult
+nsChromeRegistryChrome::GetSelectedLocale(const nsACString& aPackage,
+                                          bool aAsBCP47,
+                                          nsACString& aLocale)
+{
+  nsCString realpackage;
+  nsresult rv = OverrideLocalePackage(aPackage, realpackage);
+  if (NS_FAILED(rv))
+    return rv;
+  PackageEntry* entry;
+  if (!mPackagesHash.Get(realpackage, &entry))
+    return NS_ERROR_FILE_NOT_FOUND;
+
+  aLocale = entry->locales.GetSelected(mSelectedLocale, nsProviderArray::LOCALE);
+  if (aLocale.IsEmpty())
+    return NS_ERROR_FAILURE;
+
+  if (aAsBCP47) {
+    SanitizeForBCP47(aLocale);
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsChromeRegistryChrome::OverrideLocalePackage(const nsACString& aPackage,
+                                              nsACString& aOverride)
+{
+  const nsACString& pref = NS_LITERAL_CSTRING(PACKAGE_OVERRIDE_BRANCH) + aPackage;
+  nsAdoptingCString override = mozilla::Preferences::GetCString(PromiseFlatCString(pref).get());
+  if (override) {
+    aOverride = override;
+  }
+  else {
+    aOverride = aPackage;
+  }
+  return NS_OK;
+}
+
+nsresult
+nsChromeRegistryChrome::SelectLocaleFromPref(nsIPrefBranch* prefs)
+{
+  nsresult rv;
+  bool matchOSLocale = false;
+  rv = prefs->GetBoolPref(MATCH_OS_LOCALE_PREF, &matchOSLocale);
+
+  if (NS_SUCCEEDED(rv) && matchOSLocale) {
+    // compute lang and region code only when needed!
+    nsAutoCString uiLocale;
+    rv = getUILangCountry(uiLocale);
+    if (NS_SUCCEEDED(rv))
+      mSelectedLocale = uiLocale;
+  }
+  else {
+    nsXPIDLCString provider;
+    rv = prefs->GetCharPref(SELECTED_LOCALE_PREF, getter_Copies(provider));
+    if (NS_SUCCEEDED(rv)) {
+      mSelectedLocale = provider;
+    }
+  }
+
+  if (NS_FAILED(rv))
+    NS_ERROR("Couldn't select locale from pref!");
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsChromeRegistryChrome::Observe(nsISupports *aSubject, const char *aTopic,
+                                const char16_t *someData)
+{
+  nsresult rv = NS_OK;
+
+  if (!strcmp(NS_PREFBRANCH_PREFCHANGE_TOPIC_ID, aTopic)) {
+    nsCOMPtr<nsIPrefBranch> prefs (do_QueryInterface(aSubject));
+    NS_ASSERTION(prefs, "Bad observer call!");
+
+    NS_ConvertUTF16toUTF8 pref(someData);
+
+    if (pref.EqualsLiteral(MATCH_OS_LOCALE_PREF) ||
+        pref.EqualsLiteral(SELECTED_LOCALE_PREF)) {
+        rv = UpdateSelectedLocale();
+        if (NS_SUCCEEDED(rv) && mProfileLoaded)
+          FlushAllCaches();
+    }
+    else if (pref.EqualsLiteral(SELECTED_SKIN_PREF)) {
+      nsXPIDLCString provider;
+      rv = prefs->GetCharPref(pref.get(), getter_Copies(provider));
+      if (NS_FAILED(rv)) {
+        NS_ERROR("Couldn't get new skin pref!");
+        return rv;
+      }
+
+      mSelectedSkin = provider;
+      RefreshSkins();
+    } else {
+      NS_ERROR("Unexpected pref!");
+    }
+  }
+  else if (!strcmp("command-line-startup", aTopic)) {
+    nsCOMPtr<nsICommandLine> cmdLine (do_QueryInterface(aSubject));
+    if (cmdLine) {
+      nsAutoString uiLocale;
+      rv = cmdLine->HandleFlagWithParam(NS_LITERAL_STRING(UILOCALE_CMD_LINE_ARG),
+                                        false, uiLocale);
+      if (NS_SUCCEEDED(rv) && !uiLocale.IsEmpty()) {
+        CopyUTF16toUTF8(uiLocale, mSelectedLocale);
+        nsCOMPtr<nsIPrefBranch> prefs (do_GetService(NS_PREFSERVICE_CONTRACTID));
+        if (prefs) {
+          prefs->RemoveObserver(SELECTED_LOCALE_PREF, this);
+        }
+      }
+    }
+  }
+  else if (!strcmp("profile-initial-state", aTopic)) {
+    mProfileLoaded = true;
+  }
+  else {
+    NS_ERROR("Unexpected observer topic!");
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsChromeRegistryChrome::CheckForNewChrome()
+{
+  mPackagesHash.Clear();
+  mOverlayHash.Clear();
+  mStyleHash.Clear();
+  mOverrideTable.Clear();
+
+  mDynamicRegistration = false;
+
+  nsComponentManagerImpl::gComponentManager->RereadChromeManifests();
+
+  mDynamicRegistration = true;
+
+  SendRegisteredChrome(nullptr);
+  return NS_OK;
+}
+
+nsresult nsChromeRegistryChrome::UpdateSelectedLocale()
+{
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
+  if (prefs) {
+    rv = SelectLocaleFromPref(prefs);
+    if (NS_SUCCEEDED(rv)) {
+      nsCOMPtr<nsIObserverService> obsSvc =
+        mozilla::services::GetObserverService();
+      NS_ASSERTION(obsSvc, "Couldn't get observer service.");
+      obsSvc->NotifyObservers((nsIChromeRegistry*) this,
+                              "selected-locale-has-changed", nullptr);
+    }
+  }
+
+  return rv;
+}
+
+static void
+SerializeURI(nsIURI* aURI,
+             SerializedURI& aSerializedURI)
+{
+  if (!aURI)
+    return;
+
+  aURI->GetSpec(aSerializedURI.spec);
+  aURI->GetOriginCharset(aSerializedURI.charset);
+}
+
+void
+nsChromeRegistryChrome::SendRegisteredChrome(
+    mozilla::dom::PContentParent* aParent)
+{
+  InfallibleTArray<ChromePackage> packages;
+  InfallibleTArray<SubstitutionMapping> resources;
+  InfallibleTArray<OverrideMapping> overrides;
+
+  for (auto iter = mPackagesHash.Iter(); !iter.Done(); iter.Next()) {
+    ChromePackage chromePackage;
+    ChromePackageFromPackageEntry(iter.Key(), iter.UserData(), &chromePackage,
+                                  mSelectedLocale, mSelectedSkin);
+    packages.AppendElement(chromePackage);
+  }
+
+  // If we were passed a parent then a new child process has been created and
+  // has requested all of the chrome so send it the resources too. Otherwise
+  // resource mappings are sent by the resource protocol handler dynamically.
+  if (aParent) {
+    nsCOMPtr<nsIIOService> io (do_GetIOService());
+    NS_ENSURE_TRUE_VOID(io);
+
+    nsCOMPtr<nsIProtocolHandler> ph;
+    nsresult rv = io->GetProtocolHandler("resource", getter_AddRefs(ph));
+    NS_ENSURE_SUCCESS_VOID(rv);
+
+    nsCOMPtr<nsIResProtocolHandler> irph (do_QueryInterface(ph));
+    nsResProtocolHandler* rph = static_cast<nsResProtocolHandler*>(irph.get());
+    rv = rph->CollectSubstitutions(resources);
+    NS_ENSURE_SUCCESS_VOID(rv);
+  }
+
+  for (auto iter = mOverrideTable.Iter(); !iter.Done(); iter.Next()) {
+    SerializedURI chromeURI, overrideURI;
+
+    SerializeURI(iter.Key(), chromeURI);
+    SerializeURI(iter.UserData(), overrideURI);
+
+    OverrideMapping override = { chromeURI, overrideURI };
+    overrides.AppendElement(override);
+  }
+
+  if (aParent) {
+    bool success = aParent->SendRegisterChrome(packages, resources, overrides,
+                                               mSelectedLocale, false);
+    NS_ENSURE_TRUE_VOID(success);
+  } else {
+    nsTArray<ContentParent*> parents;
+    ContentParent::GetAll(parents);
+    if (!parents.Length())
+      return;
+
+    for (uint32_t i = 0; i < parents.Length(); i++) {
+      DebugOnly<bool> success =
+        parents[i]->SendRegisterChrome(packages, resources, overrides,
+                                       mSelectedLocale, true);
+      NS_WARNING_ASSERTION(success,
+                           "couldn't reset a child's registered chrome");
+    }
+  }
+}
+
+/* static */ void
+nsChromeRegistryChrome::ChromePackageFromPackageEntry(const nsACString& aPackageName,
+                                                      PackageEntry* aPackage,
+                                                      ChromePackage* aChromePackage,
+                                                      const nsCString& aSelectedLocale,
+                                                      const nsCString& aSelectedSkin)
+{
+  SerializeURI(aPackage->baseURI, aChromePackage->contentBaseURI);
+  SerializeURI(aPackage->locales.GetBase(aSelectedLocale,
+                                         nsProviderArray::LOCALE),
+               aChromePackage->localeBaseURI);
+  SerializeURI(aPackage->skins.GetBase(aSelectedSkin, nsProviderArray::ANY),
+               aChromePackage->skinBaseURI);
+  aChromePackage->package = aPackageName;
+  aChromePackage->flags = aPackage->flags;
+}
+
+static bool
+CanLoadResource(nsIURI* aResourceURI)
+{
+  bool isLocalResource = false;
+  (void)NS_URIChainHasFlags(aResourceURI,
+                            nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
+                            &isLocalResource);
+  return isLocalResource;
+}
+
+nsIURI*
+nsChromeRegistryChrome::GetBaseURIFromPackage(const nsCString& aPackage,
+                                              const nsCString& aProvider,
+                                              const nsCString& aPath)
+{
+  PackageEntry* entry;
+  if (!mPackagesHash.Get(aPackage, &entry)) {
+    if (!mInitialized)
+      return nullptr;
+
+    LogMessage("No chrome package registered for chrome://%s/%s/%s",
+               aPackage.get(), aProvider.get(), aPath.get());
+
+    return nullptr;
+  }
+
+  if (aProvider.EqualsLiteral("locale")) {
+    return entry->locales.GetBase(mSelectedLocale, nsProviderArray::LOCALE);
+  }
+  else if (aProvider.EqualsLiteral("skin")) {
+    return entry->skins.GetBase(mSelectedSkin, nsProviderArray::ANY);
+  }
+  else if (aProvider.EqualsLiteral("content")) {
+    return entry->baseURI;
+  }
+  return nullptr;
+}
+
+nsresult
+nsChromeRegistryChrome::GetFlagsFromPackage(const nsCString& aPackage,
+                                            uint32_t* aFlags)
+{
+  PackageEntry* entry;
+  if (!mPackagesHash.Get(aPackage, &entry))
+    return NS_ERROR_FILE_NOT_FOUND;
+
+  *aFlags = entry->flags;
+  return NS_OK;
+}
+
+nsChromeRegistryChrome::ProviderEntry*
+nsChromeRegistryChrome::nsProviderArray::GetProvider(const nsACString& aPreferred, MatchType aType)
+{
+  size_t i = mArray.Length();
+  if (!i)
+    return nullptr;
+
+  ProviderEntry* found = nullptr;  // Only set if we find a partial-match locale
+  ProviderEntry* entry = nullptr;
+
+  while (i--) {
+    entry = &mArray[i];
+    if (aPreferred.Equals(entry->provider))
+      return entry;
+
+    if (aType != LOCALE)
+      continue;
+
+    if (LanguagesMatch(aPreferred, entry->provider)) {
+      found = entry;
+      continue;
+    }
+
+    if (!found && entry->provider.EqualsLiteral("en-US"))
+      found = entry;
+  }
+
+  if (!found && aType != EXACT)
+    return entry;
+
+  return found;
+}
+
+nsIURI*
+nsChromeRegistryChrome::nsProviderArray::GetBase(const nsACString& aPreferred, MatchType aType)
+{
+  ProviderEntry* provider = GetProvider(aPreferred, aType);
+
+  if (!provider)
+    return nullptr;
+
+  return provider->baseURI;
+}
+
+const nsACString&
+nsChromeRegistryChrome::nsProviderArray::GetSelected(const nsACString& aPreferred, MatchType aType)
+{
+  ProviderEntry* entry = GetProvider(aPreferred, aType);
+
+  if (entry)
+    return entry->provider;
+
+  return EmptyCString();
+}
+
+void
+nsChromeRegistryChrome::nsProviderArray::SetBase(const nsACString& aProvider, nsIURI* aBaseURL)
+{
+  ProviderEntry* provider = GetProvider(aProvider, EXACT);
+
+  if (provider) {
+    provider->baseURI = aBaseURL;
+    return;
+  }
+
+  // no existing entries, add a new one
+  mArray.AppendElement(ProviderEntry(aProvider, aBaseURL));
+}
+
+void
+nsChromeRegistryChrome::nsProviderArray::EnumerateToArray(nsTArray<nsCString> *a)
+{
+  int32_t i = mArray.Length();
+  while (i--) {
+    a->AppendElement(mArray[i].provider);
+  }
+}
+
+void
+nsChromeRegistryChrome::OverlayListEntry::AddURI(nsIURI* aURI)
+{
+  int32_t i = mArray.Count();
+  while (i--) {
+    bool equals;
+    if (NS_SUCCEEDED(aURI->Equals(mArray[i], &equals)) && equals)
+      return;
+  }
+
+  mArray.AppendObject(aURI);
+}
+
+void
+nsChromeRegistryChrome::OverlayListHash::Add(nsIURI* aBase, nsIURI* aOverlay)
+{
+  OverlayListEntry* entry = mTable.PutEntry(aBase);
+  if (entry)
+    entry->AddURI(aOverlay);
+}
+
+const nsCOMArray<nsIURI>*
+nsChromeRegistryChrome::OverlayListHash::GetArray(nsIURI* aBase)
+{
+  OverlayListEntry* entry = mTable.GetEntry(aBase);
+  if (!entry)
+    return nullptr;
+
+  return &entry->mArray;
+}
+
+#ifdef MOZ_XUL
+NS_IMETHODIMP
+nsChromeRegistryChrome::GetStyleOverlays(nsIURI *aChromeURL,
+                                         nsISimpleEnumerator **aResult)
+{
+  nsCOMPtr<nsIURI> chromeURLWithoutHash;
+  if (aChromeURL) {
+    aChromeURL->CloneIgnoringRef(getter_AddRefs(chromeURLWithoutHash));
+  }
+  const nsCOMArray<nsIURI>* parray = mStyleHash.GetArray(chromeURLWithoutHash);
+  if (!parray)
+    return NS_NewEmptyEnumerator(aResult);
+
+  return NS_NewArrayEnumerator(aResult, *parray);
+}
+
+NS_IMETHODIMP
+nsChromeRegistryChrome::GetXULOverlays(nsIURI *aChromeURL,
+                                       nsISimpleEnumerator **aResult)
+{
+  nsCOMPtr<nsIURI> chromeURLWithoutHash;
+  if (aChromeURL) {
+    aChromeURL->CloneIgnoringRef(getter_AddRefs(chromeURLWithoutHash));
+  }
+  const nsCOMArray<nsIURI>* parray = mOverlayHash.GetArray(chromeURLWithoutHash);
+  if (!parray)
+    return NS_NewEmptyEnumerator(aResult);
+
+  return NS_NewArrayEnumerator(aResult, *parray);
+}
+#endif // MOZ_XUL
+
+nsIURI*
+nsChromeRegistry::ManifestProcessingContext::GetManifestURI()
+{
+  if (!mManifestURI) {
+    nsCString uri;
+    mFile.GetURIString(uri);
+    NS_NewURI(getter_AddRefs(mManifestURI), uri);
+  }
+  return mManifestURI;
+}
+
+nsIXPConnect*
+nsChromeRegistry::ManifestProcessingContext::GetXPConnect()
+{
+  if (!mXPConnect)
+    mXPConnect = do_GetService("@mozilla.org/js/xpc/XPConnect;1");
+
+  return mXPConnect;
+}
+
+already_AddRefed<nsIURI>
+nsChromeRegistry::ManifestProcessingContext::ResolveURI(const char* uri)
+{
+  nsIURI* baseuri = GetManifestURI();
+  if (!baseuri)
+    return nullptr;
+
+  nsCOMPtr<nsIURI> resolved;
+  nsresult rv = NS_NewURI(getter_AddRefs(resolved), uri, baseuri);
+  if (NS_FAILED(rv))
+    return nullptr;
+
+  return resolved.forget();
+}
+
+static void
+EnsureLowerCase(char *aBuf)
+{
+  for (; *aBuf; ++aBuf) {
+    char ch = *aBuf;
+    if (ch >= 'A' && ch <= 'Z')
+      *aBuf = ch + 'a' - 'A';
+  }
+}
+
+static void
+SendManifestEntry(const ChromeRegistryItem &aItem)
+{
+  nsTArray<ContentParent*> parents;
+  ContentParent::GetAll(parents);
+  if (!parents.Length())
+    return;
+
+  for (uint32_t i = 0; i < parents.Length(); i++) {
+    Unused << parents[i]->SendRegisterChromeItem(aItem);
+  }
+}
+
+void
+nsChromeRegistryChrome::ManifestContent(ManifestProcessingContext& cx, int lineno,
+                                        char *const * argv, int flags)
+{
+  char* package = argv[0];
+  char* uri = argv[1];
+
+  EnsureLowerCase(package);
+
+  nsCOMPtr<nsIURI> resolved = cx.ResolveURI(uri);
+  if (!resolved) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "During chrome registration, unable to create URI '%s'.", uri);
+    return;
+  }
+
+  if (!CanLoadResource(resolved)) {
+    LogMessageWithContext(resolved, lineno, nsIScriptError::warningFlag,
+                          "During chrome registration, cannot register non-local URI '%s' as content.",
+                          uri);
+    return;
+  }
+
+  nsDependentCString packageName(package);
+  PackageEntry* entry = mPackagesHash.LookupOrAdd(packageName);
+  entry->baseURI = resolved;
+  entry->flags = flags;
+
+  if (mDynamicRegistration) {
+    ChromePackage chromePackage;
+    ChromePackageFromPackageEntry(packageName, entry, &chromePackage,
+                                  mSelectedLocale, mSelectedSkin);
+    SendManifestEntry(chromePackage);
+  }
+}
+
+void
+nsChromeRegistryChrome::ManifestLocale(ManifestProcessingContext& cx, int lineno,
+                                       char *const * argv, int flags)
+{
+  char* package = argv[0];
+  char* provider = argv[1];
+  char* uri = argv[2];
+
+  EnsureLowerCase(package);
+
+  nsCOMPtr<nsIURI> resolved = cx.ResolveURI(uri);
+  if (!resolved) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "During chrome registration, unable to create URI '%s'.", uri);
+    return;
+  }
+
+  if (!CanLoadResource(resolved)) {
+    LogMessageWithContext(resolved, lineno, nsIScriptError::warningFlag,
+                          "During chrome registration, cannot register non-local URI '%s' as content.",
+                          uri);
+    return;
+  }
+
+  nsDependentCString packageName(package);
+  PackageEntry* entry = mPackagesHash.LookupOrAdd(packageName);
+  entry->locales.SetBase(nsDependentCString(provider), resolved);
+
+  if (mDynamicRegistration) {
+    ChromePackage chromePackage;
+    ChromePackageFromPackageEntry(packageName, entry, &chromePackage,
+                                  mSelectedLocale, mSelectedSkin);
+    SendManifestEntry(chromePackage);
+  }
+}
+
+void
+nsChromeRegistryChrome::ManifestSkin(ManifestProcessingContext& cx, int lineno,
+                                     char *const * argv, int flags)
+{
+  char* package = argv[0];
+  char* provider = argv[1];
+  char* uri = argv[2];
+
+  EnsureLowerCase(package);
+
+  nsCOMPtr<nsIURI> resolved = cx.ResolveURI(uri);
+  if (!resolved) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "During chrome registration, unable to create URI '%s'.", uri);
+    return;
+  }
+
+  if (!CanLoadResource(resolved)) {
+    LogMessageWithContext(resolved, lineno, nsIScriptError::warningFlag,
+                          "During chrome registration, cannot register non-local URI '%s' as content.",
+                          uri);
+    return;
+  }
+
+  nsDependentCString packageName(package);
+  PackageEntry* entry = mPackagesHash.LookupOrAdd(packageName);
+  entry->skins.SetBase(nsDependentCString(provider), resolved);
+
+  if (mDynamicRegistration) {
+    ChromePackage chromePackage;
+    ChromePackageFromPackageEntry(packageName, entry, &chromePackage,
+                                  mSelectedLocale, mSelectedSkin);
+    SendManifestEntry(chromePackage);
+  }
+}
+
+void
+nsChromeRegistryChrome::ManifestOverlay(ManifestProcessingContext& cx, int lineno,
+                                        char *const * argv, int flags)
+{
+  char* base = argv[0];
+  char* overlay = argv[1];
+
+  nsCOMPtr<nsIURI> baseuri = cx.ResolveURI(base);
+  nsCOMPtr<nsIURI> overlayuri = cx.ResolveURI(overlay);
+  if (!baseuri || !overlayuri) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "During chrome registration, unable to create URI.");
+    return;
+  }
+
+  if (!CanLoadResource(overlayuri)) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "Cannot register non-local URI '%s' as an overlay.", overlay);
+    return;
+  }
+
+  nsCOMPtr<nsIURI> baseuriWithoutHash;
+  baseuri->CloneIgnoringRef(getter_AddRefs(baseuriWithoutHash));
+
+  mOverlayHash.Add(baseuriWithoutHash, overlayuri);
+}
+
+void
+nsChromeRegistryChrome::ManifestStyle(ManifestProcessingContext& cx, int lineno,
+                                      char *const * argv, int flags)
+{
+  char* base = argv[0];
+  char* overlay = argv[1];
+
+  nsCOMPtr<nsIURI> baseuri = cx.ResolveURI(base);
+  nsCOMPtr<nsIURI> overlayuri = cx.ResolveURI(overlay);
+  if (!baseuri || !overlayuri) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "During chrome registration, unable to create URI.");
+    return;
+  }
+
+  if (!CanLoadResource(overlayuri)) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "Cannot register non-local URI '%s' as a style overlay.", overlay);
+    return;
+  }
+
+  nsCOMPtr<nsIURI> baseuriWithoutHash;
+  baseuri->CloneIgnoringRef(getter_AddRefs(baseuriWithoutHash));
+
+  mStyleHash.Add(baseuriWithoutHash, overlayuri);
+}
+
+void
+nsChromeRegistryChrome::ManifestOverride(ManifestProcessingContext& cx, int lineno,
+                                         char *const * argv, int flags)
+{
+  char* chrome = argv[0];
+  char* resolved = argv[1];
+
+  nsCOMPtr<nsIURI> chromeuri = cx.ResolveURI(chrome);
+  nsCOMPtr<nsIURI> resolveduri = cx.ResolveURI(resolved);
+  if (!chromeuri || !resolveduri) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "During chrome registration, unable to create URI.");
+    return;
+  }
+
+  if (cx.mType == NS_SKIN_LOCATION) {
+    bool chromeSkinOnly = false;
+    nsresult rv = chromeuri->SchemeIs("chrome", &chromeSkinOnly);
+    chromeSkinOnly = chromeSkinOnly && NS_SUCCEEDED(rv);
+    if (chromeSkinOnly) {
+      rv = resolveduri->SchemeIs("chrome", &chromeSkinOnly);
+      chromeSkinOnly = chromeSkinOnly && NS_SUCCEEDED(rv);
+    }
+    if (chromeSkinOnly) {
+      nsAutoCString chromePath, resolvedPath;
+      chromeuri->GetPath(chromePath);
+      resolveduri->GetPath(resolvedPath);
+      chromeSkinOnly = StringBeginsWith(chromePath, NS_LITERAL_CSTRING("/skin/")) &&
+                       StringBeginsWith(resolvedPath, NS_LITERAL_CSTRING("/skin/"));
+    }
+    if (!chromeSkinOnly) {
+      LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                            "Cannot register non-chrome://.../skin/ URIs '%s' and '%s' as overrides and/or to be overridden from a skin manifest.",
+                            chrome, resolved);
+      return;
+    }
+  }
+
+  if (!CanLoadResource(resolveduri)) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "Cannot register non-local URI '%s' for an override.", resolved);
+    return;
+  }
+  mOverrideTable.Put(chromeuri, resolveduri);
+
+  if (mDynamicRegistration) {
+    SerializedURI serializedChrome;
+    SerializedURI serializedOverride;
+
+    SerializeURI(chromeuri, serializedChrome);
+    SerializeURI(resolveduri, serializedOverride);
+
+    OverrideMapping override = { serializedChrome, serializedOverride };
+    SendManifestEntry(override);
+  }
+}
+
+void
+nsChromeRegistryChrome::ManifestResource(ManifestProcessingContext& cx, int lineno,
+                                         char *const * argv, int flags)
+{
+  char* package = argv[0];
+  char* uri = argv[1];
+
+  EnsureLowerCase(package);
+  nsDependentCString host(package);
+
+  nsCOMPtr<nsIIOService> io = mozilla::services::GetIOService();
+  if (!io) {
+    NS_WARNING("No IO service trying to process chrome manifests");
+    return;
+  }
+
+  nsCOMPtr<nsIProtocolHandler> ph;
+  nsresult rv = io->GetProtocolHandler("resource", getter_AddRefs(ph));
+  if (NS_FAILED(rv))
+    return;
+
+  nsCOMPtr<nsIResProtocolHandler> rph = do_QueryInterface(ph);
+
+  nsCOMPtr<nsIURI> resolved = cx.ResolveURI(uri);
+  if (!resolved) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "During chrome registration, unable to create URI '%s'.", uri);
+    return;
+  }
+
+  if (!CanLoadResource(resolved)) {
+    LogMessageWithContext(cx.GetManifestURI(), lineno, nsIScriptError::warningFlag,
+                          "Warning: cannot register non-local URI '%s' as a resource.",
+                          uri);
+    return;
+  }
+
+  rph->SetSubstitution(host, resolved);
+}