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/* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
* 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 "Helpers.h"
#include "mozIStorageError.h"
#include "prio.h"
#include "nsString.h"
#include "nsNavHistory.h"
#include "mozilla/Base64.h"
#include "mozilla/HashFunctions.h"
#include <algorithm>
#include "mozilla/Services.h"
// The length of guids that are used by history and bookmarks.
#define GUID_LENGTH 12
// Maximum number of chars to use for calculating hashes. This value has been
// picked to ensure low hash collisions on a real world common places.sqlite.
// While collisions are not a big deal for functionality, a low ratio allows
// for slightly more efficient SELECTs.
#define MAX_CHARS_TO_HASH 1500U
extern "C" {
// Generates a new Places GUID. This function uses C linkage because it's
// called from the Rust synced bookmarks mirror, on the storage thread.
nsresult NS_GeneratePlacesGUID(nsACString* _guid) {
return mozilla::places::GenerateGUID(*_guid);
}
} // extern "C"
namespace mozilla {
namespace places {
////////////////////////////////////////////////////////////////////////////////
//// AsyncStatementCallback
NS_IMPL_ISUPPORTS(AsyncStatementCallback, mozIStorageStatementCallback)
NS_IMETHODIMP
WeakAsyncStatementCallback::HandleResult(mozIStorageResultSet* aResultSet) {
MOZ_ASSERT(false, "Was not expecting a resultset, but got it.");
return NS_OK;
}
NS_IMETHODIMP
WeakAsyncStatementCallback::HandleCompletion(uint16_t aReason) { return NS_OK; }
NS_IMETHODIMP
WeakAsyncStatementCallback::HandleError(mozIStorageError* aError) {
#ifdef DEBUG
int32_t result;
nsresult rv = aError->GetResult(&result);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString message;
rv = aError->GetMessage(message);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString warnMsg;
warnMsg.AppendLiteral(
"An error occurred while executing an async statement: ");
warnMsg.AppendInt(result);
warnMsg.Append(' ');
warnMsg.Append(message);
NS_WARNING(warnMsg.get());
#endif
return NS_OK;
}
#define URI_TO_URLCSTRING(uri, spec) \
nsAutoCString spec; \
if (NS_FAILED(aURI->GetSpec(spec))) { \
return NS_ERROR_UNEXPECTED; \
}
// Bind URI to statement by index.
nsresult // static
URIBinder::Bind(mozIStorageStatement* aStatement, int32_t aIndex,
nsIURI* aURI) {
NS_ASSERTION(aStatement, "Must have non-null statement");
NS_ASSERTION(aURI, "Must have non-null uri");
URI_TO_URLCSTRING(aURI, spec);
return URIBinder::Bind(aStatement, aIndex, spec);
}
// Statement URLCString to statement by index.
nsresult // static
URIBinder::Bind(mozIStorageStatement* aStatement, int32_t index,
const nsACString& aURLString) {
NS_ASSERTION(aStatement, "Must have non-null statement");
return aStatement->BindUTF8StringByIndex(
index, StringHead(aURLString, URI_LENGTH_MAX));
}
// Bind URI to statement by name.
nsresult // static
URIBinder::Bind(mozIStorageStatement* aStatement, const nsACString& aName,
nsIURI* aURI) {
NS_ASSERTION(aStatement, "Must have non-null statement");
NS_ASSERTION(aURI, "Must have non-null uri");
URI_TO_URLCSTRING(aURI, spec);
return URIBinder::Bind(aStatement, aName, spec);
}
// Bind URLCString to statement by name.
nsresult // static
URIBinder::Bind(mozIStorageStatement* aStatement, const nsACString& aName,
const nsACString& aURLString) {
NS_ASSERTION(aStatement, "Must have non-null statement");
return aStatement->BindUTF8StringByName(
aName, StringHead(aURLString, URI_LENGTH_MAX));
}
// Bind URI to params by index.
nsresult // static
URIBinder::Bind(mozIStorageBindingParams* aParams, int32_t aIndex,
nsIURI* aURI) {
NS_ASSERTION(aParams, "Must have non-null statement");
NS_ASSERTION(aURI, "Must have non-null uri");
URI_TO_URLCSTRING(aURI, spec);
return URIBinder::Bind(aParams, aIndex, spec);
}
// Bind URLCString to params by index.
nsresult // static
URIBinder::Bind(mozIStorageBindingParams* aParams, int32_t index,
const nsACString& aURLString) {
NS_ASSERTION(aParams, "Must have non-null statement");
return aParams->BindUTF8StringByIndex(index,
StringHead(aURLString, URI_LENGTH_MAX));
}
// Bind URI to params by name.
nsresult // static
URIBinder::Bind(mozIStorageBindingParams* aParams, const nsACString& aName,
nsIURI* aURI) {
NS_ASSERTION(aParams, "Must have non-null params array");
NS_ASSERTION(aURI, "Must have non-null uri");
URI_TO_URLCSTRING(aURI, spec);
return URIBinder::Bind(aParams, aName, spec);
}
// Bind URLCString to params by name.
nsresult // static
URIBinder::Bind(mozIStorageBindingParams* aParams, const nsACString& aName,
const nsACString& aURLString) {
NS_ASSERTION(aParams, "Must have non-null params array");
nsresult rv = aParams->BindUTF8StringByName(
aName, StringHead(aURLString, URI_LENGTH_MAX));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
#undef URI_TO_URLCSTRING
nsresult GetReversedHostname(nsIURI* aURI, nsString& aRevHost) {
nsAutoCString forward8;
nsresult rv = aURI->GetHost(forward8);
// Not all URIs have a host.
if (NS_FAILED(rv)) return rv;
// can't do reversing in UTF8, better use 16-bit chars
GetReversedHostname(NS_ConvertUTF8toUTF16(forward8), aRevHost);
return NS_OK;
}
void GetReversedHostname(const nsString& aForward, nsString& aRevHost) {
ReverseString(aForward, aRevHost);
aRevHost.Append(char16_t('.'));
}
void ReverseString(const nsString& aInput, nsString& aReversed) {
aReversed.Truncate(0);
for (int32_t i = aInput.Length() - 1; i >= 0; i--) {
aReversed.Append(aInput[i]);
}
}
static nsresult GenerateRandomBytes(uint32_t aSize, uint8_t* _buffer) {
// On Windows, we'll use its built-in cryptographic API.
#if defined(XP_WIN)
const nsNavHistory* history = nsNavHistory::GetConstHistoryService();
HCRYPTPROV cryptoProvider;
nsresult rv = history->GetCryptoProvider(cryptoProvider);
NS_ENSURE_SUCCESS(rv, rv);
BOOL rc = CryptGenRandom(cryptoProvider, aSize, _buffer);
return rc ? NS_OK : NS_ERROR_FAILURE;
// On Unix, we'll just read in from /dev/urandom.
#elif defined(XP_UNIX)
NS_ENSURE_ARG_MAX(aSize, INT32_MAX);
PRFileDesc* urandom = PR_Open("/dev/urandom", PR_RDONLY, 0);
nsresult rv = NS_ERROR_FAILURE;
if (urandom) {
int32_t bytesRead = PR_Read(urandom, _buffer, aSize);
if (bytesRead == static_cast<int32_t>(aSize)) {
rv = NS_OK;
}
(void)PR_Close(urandom);
}
return rv;
#endif
}
nsresult GenerateGUID(nsACString& _guid) {
_guid.Truncate();
// Request raw random bytes and base64url encode them. For each set of three
// bytes, we get one character.
const uint32_t kRequiredBytesLength =
static_cast<uint32_t>(GUID_LENGTH / 4 * 3);
uint8_t buffer[kRequiredBytesLength];
nsresult rv = GenerateRandomBytes(kRequiredBytesLength, buffer);
NS_ENSURE_SUCCESS(rv, rv);
rv = Base64URLEncode(kRequiredBytesLength, buffer,
Base64URLEncodePaddingPolicy::Omit, _guid);
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(_guid.Length() == GUID_LENGTH, "GUID is not the right size!");
return NS_OK;
}
bool IsValidGUID(const nsACString& aGUID) {
nsCString::size_type len = aGUID.Length();
if (len != GUID_LENGTH) {
return false;
}
for (nsCString::size_type i = 0; i < len; i++) {
char c = aGUID[i];
if ((c >= 'a' && c <= 'z') || // a-z
(c >= 'A' && c <= 'Z') || // A-Z
(c >= '0' && c <= '9') || // 0-9
c == '-' || c == '_') { // - or _
continue;
}
return false;
}
return true;
}
void TruncateTitle(const nsACString& aTitle, nsACString& aTrimmed) {
if (aTitle.IsVoid()) {
return;
}
aTrimmed = aTitle;
if (aTitle.Length() > TITLE_LENGTH_MAX) {
aTrimmed = StringHead(aTitle, TITLE_LENGTH_MAX);
}
}
PRTime RoundToMilliseconds(PRTime aTime) {
return aTime - (aTime % PR_USEC_PER_MSEC);
}
PRTime RoundedPRNow() { return RoundToMilliseconds(PR_Now()); }
nsresult HashURL(const nsACString& aSpec, const nsACString& aMode,
uint64_t* _hash) {
NS_ENSURE_ARG_POINTER(_hash);
// HashString doesn't stop at the string boundaries if a length is passed to
// it, so ensure to pass a proper value.
const uint32_t maxLenToHash =
std::min(static_cast<uint32_t>(aSpec.Length()), MAX_CHARS_TO_HASH);
if (aMode.IsEmpty()) {
// URI-like strings (having a prefix before a colon), are handled specially,
// as a 48 bit hash, where first 16 bits are the prefix hash, while the
// other 32 are the string hash.
// The 16 bits have been decided based on the fact hashing all of the IANA
// known schemes, plus "places", does not generate collisions.
// Since we only care about schemes, we just search in the first 50 chars.
// The longest known IANA scheme, at this time, is 30 chars.
const nsDependentCSubstring& strHead = StringHead(aSpec, 50);
nsACString::const_iterator start, tip, end;
strHead.BeginReading(tip);
start = tip;
strHead.EndReading(end);
uint32_t strHash = HashString(aSpec.BeginReading(), maxLenToHash);
if (FindCharInReadable(':', tip, end)) {
const nsDependentCSubstring& prefix = Substring(start, tip);
uint64_t prefixHash =
static_cast<uint64_t>(HashString(prefix) & 0x0000FFFF);
// The second half of the url is more likely to be unique, so we add it.
*_hash = (prefixHash << 32) + strHash;
} else {
*_hash = strHash;
}
} else if (aMode.EqualsLiteral("prefix_lo")) {
// Keep only 16 bits.
*_hash = static_cast<uint64_t>(
HashString(aSpec.BeginReading(), maxLenToHash) & 0x0000FFFF)
<< 32;
} else if (aMode.EqualsLiteral("prefix_hi")) {
// Keep only 16 bits.
*_hash = static_cast<uint64_t>(
HashString(aSpec.BeginReading(), maxLenToHash) & 0x0000FFFF)
<< 32;
// Make this a prefix upper bound by filling the lowest 32 bits.
*_hash += 0xFFFFFFFF;
} else {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
bool GetHiddenState(bool aIsRedirect, uint32_t aTransitionType) {
return aTransitionType == nsINavHistoryService::TRANSITION_FRAMED_LINK ||
aTransitionType == nsINavHistoryService::TRANSITION_EMBED ||
aIsRedirect;
}
nsresult TokenizeQueryString(const nsACString& aQuery,
nsTArray<QueryKeyValuePair>* aTokens) {
// Strip off the "place:" prefix
const uint32_t prefixlen = 6; // = strlen("place:");
nsCString query;
if (aQuery.Length() >= prefixlen &&
Substring(aQuery, 0, prefixlen).EqualsLiteral("place:"))
query = Substring(aQuery, prefixlen);
else
query = aQuery;
int32_t keyFirstIndex = 0;
int32_t equalsIndex = 0;
for (uint32_t i = 0; i < query.Length(); i++) {
if (query[i] == '&') {
// new clause, save last one
if (i - keyFirstIndex > 1) {
// XXX(Bug 1631371) Check if this should use a fallible operation as it
// pretended earlier, or change the return type to void.
aTokens->AppendElement(
QueryKeyValuePair(query, keyFirstIndex, equalsIndex, i));
}
keyFirstIndex = equalsIndex = i + 1;
} else if (query[i] == '=') {
equalsIndex = i;
}
}
// handle last pair, if any
if (query.Length() - keyFirstIndex > 1) {
// XXX(Bug 1631371) Check if this should use a fallible operation as it
// pretended earlier, or change the return type to void.
aTokens->AppendElement(
QueryKeyValuePair(query, keyFirstIndex, equalsIndex, query.Length()));
}
return NS_OK;
}
void TokensToQueryString(const nsTArray<QueryKeyValuePair>& aTokens,
nsACString& aQuery) {
aQuery = "place:"_ns;
for (uint32_t i = 0; i < aTokens.Length(); i++) {
if (i > 0) {
aQuery.Append("&");
}
aQuery.Append(aTokens[i].key);
aQuery.AppendLiteral("=");
aQuery.Append(aTokens[i].value);
}
}
} // namespace places
} // namespace mozilla