DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (f5ad8dcc3ee8)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446
/* 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

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) {
        if (! aTokens->AppendElement(QueryKeyValuePair(query, keyFirstIndex,
                                                       equalsIndex, i)))
          return NS_ERROR_OUT_OF_MEMORY;
      }
      keyFirstIndex = equalsIndex = i + 1;
    } else if (query[i] == '=') {
      equalsIndex = i;
    }
  }

  // handle last pair, if any
  if (query.Length() - keyFirstIndex > 1) {
    if (! aTokens->AppendElement(QueryKeyValuePair(query, keyFirstIndex,
                                                   equalsIndex, query.Length())))
      return NS_ERROR_OUT_OF_MEMORY;
  }
  return NS_OK;
}

void
TokensToQueryString(const nsTArray<QueryKeyValuePair> &aTokens,
                    nsACString &aQuery)
{
  aQuery = NS_LITERAL_CSTRING("place:");
  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);
  }
}

////////////////////////////////////////////////////////////////////////////////
//// AsyncStatementCallbackNotifier

NS_IMETHODIMP
AsyncStatementCallbackNotifier::HandleCompletion(uint16_t aReason)
{
  if (aReason != mozIStorageStatementCallback::REASON_FINISHED)
    return NS_ERROR_UNEXPECTED;

  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
  if (obs) {
    (void)obs->NotifyObservers(nullptr, mTopic, nullptr);
  }

  return NS_OK;
}

////////////////////////////////////////////////////////////////////////////////
//// AsyncStatementCallbackNotifier

NS_IMETHODIMP
AsyncStatementTelemetryTimer::HandleCompletion(uint16_t aReason)
{
  if (aReason == mozIStorageStatementCallback::REASON_FINISHED) {
    Telemetry::AccumulateTimeDelta(mHistogramId, mStart);
  }
  return NS_OK;
}

} // namespace places
} // namespace mozilla