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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/. */

#include "nsScriptNameSpaceManager.h"
#include "nsCOMPtr.h"
#include "nsIComponentManager.h"
#include "nsIComponentRegistrar.h"
#include "nsICategoryManager.h"
#include "nsIServiceManager.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsIScriptNameSpaceManager.h"
#include "nsIScriptContext.h"
#include "nsIInterfaceInfoManager.h"
#include "nsIInterfaceInfo.h"
#include "xptinfo.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsHashKeys.h"
#include "nsDOMClassInfo.h"
#include "nsCRT.h"
#include "nsIObserverService.h"
#include "nsISimpleEnumerator.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/WebIDLGlobalNameHash.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"

#define NS_INTERFACE_PREFIX "nsI"
#define NS_DOM_INTERFACE_PREFIX "nsIDOM"

using namespace mozilla;
using namespace mozilla::dom;

static PLDHashNumber GlobalNameHashHashKey(const void *key) {
  const nsAString *str = static_cast<const nsAString *>(key);
  return HashString(*str);
}

static bool GlobalNameHashMatchEntry(const PLDHashEntryHdr *entry,
                                     const void *key) {
  const GlobalNameMapEntry *e = static_cast<const GlobalNameMapEntry *>(entry);
  const nsAString *str = static_cast<const nsAString *>(key);

  return str->Equals(e->mKey);
}

static void GlobalNameHashClearEntry(PLDHashTable *table,
                                     PLDHashEntryHdr *entry) {
  GlobalNameMapEntry *e = static_cast<GlobalNameMapEntry *>(entry);

  // An entry is being cleared, let the key (nsString) do its own
  // cleanup.
  e->mKey.~nsString();

  // This will set e->mGlobalName.mType to
  // nsGlobalNameStruct::eTypeNotInitialized
  memset(&e->mGlobalName, 0, sizeof(nsGlobalNameStruct));
}

static void GlobalNameHashInitEntry(PLDHashEntryHdr *entry, const void *key) {
  GlobalNameMapEntry *e = static_cast<GlobalNameMapEntry *>(entry);
  const nsAString *keyStr = static_cast<const nsAString *>(key);

  // Initialize the key in the entry with placement new
  new (&e->mKey) nsString(*keyStr);

  // This will set e->mGlobalName.mType to
  // nsGlobalNameStruct::eTypeNotInitialized
  memset(&e->mGlobalName, 0, sizeof(nsGlobalNameStruct));
}

NS_IMPL_ISUPPORTS(nsScriptNameSpaceManager, nsIObserver,
                  nsISupportsWeakReference, nsIMemoryReporter)

static const PLDHashTableOps hash_table_ops = {
    GlobalNameHashHashKey, GlobalNameHashMatchEntry,
    PLDHashTable::MoveEntryStub, GlobalNameHashClearEntry,
    GlobalNameHashInitEntry};

#define GLOBALNAME_HASHTABLE_INITIAL_LENGTH 32

nsScriptNameSpaceManager::nsScriptNameSpaceManager()
    : mGlobalNames(&hash_table_ops, sizeof(GlobalNameMapEntry),
                   GLOBALNAME_HASHTABLE_INITIAL_LENGTH) {}

nsScriptNameSpaceManager::~nsScriptNameSpaceManager() {
  UnregisterWeakMemoryReporter(this);
}

nsGlobalNameStruct *nsScriptNameSpaceManager::AddToHash(
    const char *aKey, const char16_t **aClassName) {
  NS_ConvertASCIItoUTF16 key(aKey);
  auto entry =
      static_cast<GlobalNameMapEntry *>(mGlobalNames.Add(&key, fallible));
  if (!entry) {
    return nullptr;
  }

  WebIDLGlobalNameHash::Remove(aKey, key.Length());

  if (aClassName) {
    *aClassName = entry->mKey.get();
  }

  return &entry->mGlobalName;
}

void nsScriptNameSpaceManager::RemoveFromHash(const nsAString *aKey) {
  mGlobalNames.Remove(aKey);
}

nsresult nsScriptNameSpaceManager::FillHash(
    nsICategoryManager *aCategoryManager, const char *aCategory) {
  nsCOMPtr<nsISimpleEnumerator> e;
  nsresult rv =
      aCategoryManager->EnumerateCategory(aCategory, getter_AddRefs(e));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsISupports> entry;
  while (NS_SUCCEEDED(e->GetNext(getter_AddRefs(entry)))) {
    rv = AddCategoryEntryToHash(aCategoryManager, aCategory, entry);
    if (NS_FAILED(rv)) {
      return rv;
    }
  }

  return NS_OK;
}

nsresult nsScriptNameSpaceManager::Init() {
  RegisterWeakMemoryReporter(this);

  nsresult rv = NS_OK;

  nsCOMPtr<nsICategoryManager> cm =
      do_GetService(NS_CATEGORYMANAGER_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = FillHash(cm, JAVASCRIPT_GLOBAL_CONSTRUCTOR_CATEGORY);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = FillHash(cm, JAVASCRIPT_GLOBAL_PROPERTY_CATEGORY);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = FillHash(cm, JAVASCRIPT_GLOBAL_PRIVILEGED_PROPERTY_CATEGORY);
  NS_ENSURE_SUCCESS(rv, rv);

  // Initial filling of the has table has been done.
  // Now, listen for changes.
  nsCOMPtr<nsIObserverService> serv = mozilla::services::GetObserverService();

  if (serv) {
    serv->AddObserver(this, NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID, true);
    serv->AddObserver(this, NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID, true);
  }

  return NS_OK;
}

const nsGlobalNameStruct *nsScriptNameSpaceManager::LookupName(
    const nsAString &aName, const char16_t **aClassName) {
  auto entry = static_cast<GlobalNameMapEntry *>(mGlobalNames.Search(&aName));

  if (entry) {
    if (aClassName) {
      *aClassName = entry->mKey.get();
    }
    return &entry->mGlobalName;
  }

  if (aClassName) {
    *aClassName = nullptr;
  }
  return nullptr;
}

nsresult nsScriptNameSpaceManager::RegisterClassName(const char *aClassName,
                                                     int32_t aDOMClassInfoID,
                                                     bool aPrivileged,
                                                     bool aXBLAllowed,
                                                     const char16_t **aResult) {
  if (!nsCRT::IsAscii(aClassName)) {
    NS_ERROR("Trying to register a non-ASCII class name");
    return NS_OK;
  }
  nsGlobalNameStruct *s = AddToHash(aClassName, aResult);
  NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);

  if (s->mType == nsGlobalNameStruct::eTypeClassConstructor) {
    return NS_OK;
  }

  // If a external constructor is already defined with aClassName we
  // won't overwrite it.

  if (s->mType == nsGlobalNameStruct::eTypeExternalConstructor) {
    return NS_OK;
  }

  NS_ASSERTION(s->mType == nsGlobalNameStruct::eTypeNotInitialized,
               "Whaaa, JS environment name clash!");

  s->mType = nsGlobalNameStruct::eTypeClassConstructor;
  s->mDOMClassInfoID = aDOMClassInfoID;
  s->mChromeOnly = aPrivileged;
  s->mAllowXBL = aXBLAllowed;

  return NS_OK;
}

nsresult nsScriptNameSpaceManager::RegisterClassProto(
    const char *aClassName, const nsIID *aConstructorProtoIID,
    bool *aFoundOld) {
  NS_ENSURE_ARG_POINTER(aConstructorProtoIID);

  *aFoundOld = false;

  nsGlobalNameStruct *s = AddToHash(aClassName);
  NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);

  if (s->mType != nsGlobalNameStruct::eTypeNotInitialized) {
    *aFoundOld = true;

    return NS_OK;
  }

  s->mType = nsGlobalNameStruct::eTypeClassProto;
  s->mIID = *aConstructorProtoIID;

  return NS_OK;
}

nsresult nsScriptNameSpaceManager::OperateCategoryEntryHash(
    nsICategoryManager *aCategoryManager, const char *aCategory,
    nsISupports *aEntry, bool aRemove) {
  MOZ_ASSERT(aCategoryManager);
  // Get the type from the category name.
  // NOTE: we could have passed the type in FillHash() and guessed it in
  // Observe() but this way, we have only one place to update and this is
  // not performance sensitive.
  nsGlobalNameStruct::nametype type;
  if (strcmp(aCategory, JAVASCRIPT_GLOBAL_CONSTRUCTOR_CATEGORY) == 0) {
    type = nsGlobalNameStruct::eTypeExternalConstructor;
  } else if (strcmp(aCategory, JAVASCRIPT_GLOBAL_PROPERTY_CATEGORY) == 0 ||
             strcmp(aCategory,
                    JAVASCRIPT_GLOBAL_PRIVILEGED_PROPERTY_CATEGORY) == 0) {
    type = nsGlobalNameStruct::eTypeProperty;
  } else {
    return NS_OK;
  }

  nsCOMPtr<nsISupportsCString> strWrapper = do_QueryInterface(aEntry);

  if (!strWrapper) {
    NS_WARNING("Category entry not an nsISupportsCString!");
    return NS_OK;
  }

  nsAutoCString categoryEntry;
  nsresult rv = strWrapper->GetData(categoryEntry);
  NS_ENSURE_SUCCESS(rv, rv);

  // We need to handle removal before calling GetCategoryEntry
  // because the category entry is already removed before we are
  // notified.
  if (aRemove) {
    NS_ConvertASCIItoUTF16 entry(categoryEntry);
    const nsGlobalNameStruct *s = LookupName(entry);
    // Verify mType so that this API doesn't remove names
    // registered by others.
    if (!s || s->mType != type) {
      return NS_OK;
    }

    RemoveFromHash(&entry);
    return NS_OK;
  }

  nsCString contractId;
  rv = aCategoryManager->GetCategoryEntry(aCategory, categoryEntry.get(),
                                          getter_Copies(contractId));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIComponentRegistrar> registrar;
  rv = NS_GetComponentRegistrar(getter_AddRefs(registrar));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCID *cidPtr;
  rv = registrar->ContractIDToCID(contractId.get(), &cidPtr);

  if (NS_FAILED(rv)) {
    NS_WARNING("Bad contract id registed with the script namespace manager");
    return NS_OK;
  }

  // Copy CID onto the stack, so we can free it right away and avoid having
  // to add cleanup code at every exit point from this function.
  nsCID cid = *cidPtr;
  free(cidPtr);

  nsGlobalNameStruct *s = AddToHash(categoryEntry.get());
  NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);

  if (s->mType == nsGlobalNameStruct::eTypeNotInitialized) {
    s->mType = type;
    s->mCID = cid;
    s->mChromeOnly =
        strcmp(aCategory, JAVASCRIPT_GLOBAL_PRIVILEGED_PROPERTY_CATEGORY) == 0;
  } else {
    NS_WARNING("Global script name not overwritten!");
  }

  return NS_OK;
}

nsresult nsScriptNameSpaceManager::AddCategoryEntryToHash(
    nsICategoryManager *aCategoryManager, const char *aCategory,
    nsISupports *aEntry) {
  return OperateCategoryEntryHash(aCategoryManager, aCategory, aEntry,
                                  /* aRemove = */ false);
}

nsresult nsScriptNameSpaceManager::RemoveCategoryEntryFromHash(
    nsICategoryManager *aCategoryManager, const char *aCategory,
    nsISupports *aEntry) {
  return OperateCategoryEntryHash(aCategoryManager, aCategory, aEntry,
                                  /* aRemove = */ true);
}

NS_IMETHODIMP
nsScriptNameSpaceManager::Observe(nsISupports *aSubject, const char *aTopic,
                                  const char16_t *aData) {
  if (!aData) {
    return NS_OK;
  }

  if (!strcmp(aTopic, NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID)) {
    nsCOMPtr<nsICategoryManager> cm =
        do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
    if (!cm) {
      return NS_OK;
    }

    return AddCategoryEntryToHash(cm, NS_ConvertUTF16toUTF8(aData).get(),
                                  aSubject);
  } else if (!strcmp(aTopic, NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID)) {
    nsCOMPtr<nsICategoryManager> cm =
        do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
    if (!cm) {
      return NS_OK;
    }

    return RemoveCategoryEntryFromHash(cm, NS_ConvertUTF16toUTF8(aData).get(),
                                       aSubject);
  }

  // TODO: we could observe NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID
  // but we are safe without it. See bug 600460.

  return NS_OK;
}

MOZ_DEFINE_MALLOC_SIZE_OF(ScriptNameSpaceManagerMallocSizeOf)

NS_IMETHODIMP
nsScriptNameSpaceManager::CollectReports(nsIHandleReportCallback *aHandleReport,
                                         nsISupports *aData, bool aAnonymize) {
  MOZ_COLLECT_REPORT("explicit/script-namespace-manager", KIND_HEAP,
                     UNITS_BYTES,
                     SizeOfIncludingThis(ScriptNameSpaceManagerMallocSizeOf),
                     "Memory used for the script namespace manager.");

  return NS_OK;
}

size_t nsScriptNameSpaceManager::SizeOfIncludingThis(
    mozilla::MallocSizeOf aMallocSizeOf) const {
  size_t n = 0;

  n += mGlobalNames.ShallowSizeOfExcludingThis(aMallocSizeOf);
  for (auto iter = mGlobalNames.ConstIter(); !iter.Done(); iter.Next()) {
    auto entry = static_cast<GlobalNameMapEntry *>(iter.Get());
    n += entry->SizeOfExcludingThis(aMallocSizeOf);
  }

  return n;
}