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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 // | |
| 5 // This is a port of ManifestParser.cc from WebKit/WebCore/loader/appcache. | |
| 6 | |
| 7 /* | |
| 8 * Copyright (C) 2008 Apple Inc. All Rights Reserved. | |
| 9 * | |
| 10 * Redistribution and use in source and binary forms, with or without | |
| 11 * modification, are permitted provided that the following conditions | |
| 12 * are met: | |
| 13 * 1. Redistributions of source code must retain the above copyright | |
| 14 * notice, this list of conditions and the following disclaimer. | |
| 15 * 2. Redistributions in binary form must reproduce the above copyright | |
| 16 * notice, this list of conditions and the following disclaimer in the | |
| 17 * documentation and/or other materials provided with the distribution. | |
| 18 * | |
| 19 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
| 20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
| 23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 27 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 30 */ | |
| 31 | |
| 32 #include "content/browser/appcache/manifest_parser.h" | |
| 33 | |
| 34 #include "base/command_line.h" | |
| 35 #include "base/i18n/icu_string_conversions.h" | |
| 36 #include "base/logging.h" | |
| 37 #include "base/strings/utf_string_conversions.h" | |
| 38 #include "url/gurl.h" | |
| 39 | |
| 40 namespace content { | |
| 41 | |
| 42 namespace { | |
| 43 | |
| 44 // Helper function used to identify 'isPattern' annotations. | |
| 45 bool HasPatternMatchingAnnotation(const wchar_t* line_p, | |
| 46 const wchar_t* line_end) { | |
| 47 // Skip whitespace separating the resource url from the annotation. | |
| 48 // Note: trailing whitespace has already been trimmed from the line. | |
| 49 while (line_p < line_end && (*line_p == '\t' || *line_p == ' ')) | |
| 50 ++line_p; | |
| 51 if (line_p == line_end) | |
| 52 return false; | |
| 53 std::wstring annotation(line_p, line_end - line_p); | |
| 54 return annotation == L"isPattern"; | |
| 55 } | |
| 56 | |
| 57 } | |
| 58 | |
| 59 enum Mode { | |
| 60 EXPLICIT, | |
| 61 INTERCEPT, | |
| 62 FALLBACK, | |
| 63 ONLINE_WHITELIST, | |
| 64 UNKNOWN_MODE, | |
| 65 }; | |
| 66 | |
| 67 enum InterceptVerb { | |
| 68 RETURN, | |
| 69 EXECUTE, | |
| 70 UNKNOWN_VERB, | |
| 71 }; | |
| 72 | |
| 73 Manifest::Manifest() | |
| 74 : online_whitelist_all(false), | |
| 75 did_ignore_intercept_namespaces(false) { | |
| 76 } | |
| 77 | |
| 78 Manifest::~Manifest() {} | |
| 79 | |
| 80 bool ParseManifest(const GURL& manifest_url, const char* data, int length, | |
| 81 ParseMode parse_mode, Manifest& manifest) { | |
| 82 // This is an implementation of the parsing algorithm specified in | |
| 83 // the HTML5 offline web application docs: | |
| 84 // http://www.w3.org/TR/html5/offline.html | |
| 85 // Do not modify it without consulting those docs. | |
| 86 // Though you might be tempted to convert these wstrings to UTF-8 or | |
| 87 // base::string16, this implementation seems simpler given the constraints. | |
| 88 | |
| 89 const wchar_t kSignature[] = L"CACHE MANIFEST"; | |
| 90 const size_t kSignatureLength = arraysize(kSignature) - 1; | |
| 91 const wchar_t kChromiumSignature[] = L"CHROMIUM CACHE MANIFEST"; | |
| 92 const size_t kChromiumSignatureLength = arraysize(kChromiumSignature) - 1; | |
| 93 | |
| 94 DCHECK(manifest.explicit_urls.empty()); | |
| 95 DCHECK(manifest.fallback_namespaces.empty()); | |
| 96 DCHECK(manifest.online_whitelist_namespaces.empty()); | |
| 97 DCHECK(!manifest.online_whitelist_all); | |
| 98 DCHECK(!manifest.did_ignore_intercept_namespaces); | |
| 99 | |
| 100 Mode mode = EXPLICIT; | |
| 101 | |
| 102 std::wstring data_string; | |
| 103 // TODO(jennb): cannot do UTF8ToWide(data, length, &data_string); | |
| 104 // until UTF8ToWide uses 0xFFFD Unicode replacement character. | |
| 105 base::CodepageToWide(std::string(data, length), base::kCodepageUTF8, | |
| 106 base::OnStringConversionError::SUBSTITUTE, &data_string); | |
| 107 const wchar_t* p = data_string.c_str(); | |
| 108 const wchar_t* end = p + data_string.length(); | |
| 109 | |
| 110 // Look for the magic signature: "^\xFEFF?CACHE MANIFEST[ \t]?" | |
| 111 // Example: "CACHE MANIFEST #comment" is a valid signature. | |
| 112 // Example: "CACHE MANIFEST;V2" is not. | |
| 113 | |
| 114 // When the input data starts with a UTF-8 Byte-Order-Mark | |
| 115 // (0xEF, 0xBB, 0xBF), the UTF8ToWide() function converts it to a | |
| 116 // Unicode BOM (U+FEFF). Skip a converted Unicode BOM if it exists. | |
| 117 int bom_offset = 0; | |
| 118 if (!data_string.empty() && data_string[0] == 0xFEFF) { | |
| 119 bom_offset = 1; | |
| 120 ++p; | |
| 121 } | |
| 122 | |
| 123 if (p >= end) | |
| 124 return false; | |
| 125 | |
| 126 // Check for a supported signature and skip p past it. | |
| 127 if (0 == data_string.compare(bom_offset, kSignatureLength, | |
| 128 kSignature)) { | |
| 129 p += kSignatureLength; | |
| 130 } else if (0 == data_string.compare(bom_offset, kChromiumSignatureLength, | |
| 131 kChromiumSignature)) { | |
| 132 p += kChromiumSignatureLength; | |
| 133 } else { | |
| 134 return false; | |
| 135 } | |
| 136 | |
| 137 // Character after "CACHE MANIFEST" must be whitespace. | |
| 138 if (p < end && *p != ' ' && *p != '\t' && *p != '\n' && *p != '\r') | |
| 139 return false; | |
| 140 | |
| 141 // Skip to the end of the line. | |
| 142 while (p < end && *p != '\r' && *p != '\n') | |
| 143 ++p; | |
| 144 | |
| 145 while (1) { | |
| 146 // Skip whitespace | |
| 147 while (p < end && (*p == '\n' || *p == '\r' || *p == ' ' || *p == '\t')) | |
| 148 ++p; | |
| 149 | |
| 150 if (p == end) | |
| 151 break; | |
| 152 | |
| 153 const wchar_t* line_start = p; | |
| 154 | |
| 155 // Find the end of the line | |
| 156 while (p < end && *p != '\r' && *p != '\n') | |
| 157 ++p; | |
| 158 | |
| 159 // Check if we have a comment | |
| 160 if (*line_start == '#') | |
| 161 continue; | |
| 162 | |
| 163 // Get rid of trailing whitespace | |
| 164 const wchar_t* tmp = p - 1; | |
| 165 while (tmp > line_start && (*tmp == ' ' || *tmp == '\t')) | |
| 166 --tmp; | |
| 167 | |
| 168 std::wstring line(line_start, tmp - line_start + 1); | |
| 169 | |
| 170 if (line == L"CACHE:") { | |
| 171 mode = EXPLICIT; | |
| 172 } else if (line == L"FALLBACK:") { | |
| 173 mode = FALLBACK; | |
| 174 } else if (line == L"NETWORK:") { | |
| 175 mode = ONLINE_WHITELIST; | |
| 176 } else if (line == L"CHROMIUM-INTERCEPT:") { | |
| 177 mode = INTERCEPT; | |
| 178 } else if (*(line.end() - 1) == ':') { | |
| 179 mode = UNKNOWN_MODE; | |
| 180 } else if (mode == UNKNOWN_MODE) { | |
| 181 continue; | |
| 182 } else if (line == L"*" && mode == ONLINE_WHITELIST) { | |
| 183 manifest.online_whitelist_all = true; | |
| 184 continue; | |
| 185 } else if (mode == EXPLICIT || mode == ONLINE_WHITELIST) { | |
| 186 const wchar_t *line_p = line.c_str(); | |
| 187 const wchar_t *line_end = line_p + line.length(); | |
| 188 | |
| 189 // Look for whitespace separating the URL from subsequent ignored tokens. | |
| 190 while (line_p < line_end && *line_p != '\t' && *line_p != ' ') | |
| 191 ++line_p; | |
| 192 | |
| 193 base::string16 url16; | |
| 194 base::WideToUTF16(line.c_str(), line_p - line.c_str(), &url16); | |
| 195 GURL url = manifest_url.Resolve(url16); | |
| 196 if (!url.is_valid()) | |
| 197 continue; | |
| 198 if (url.has_ref()) { | |
| 199 GURL::Replacements replacements; | |
| 200 replacements.ClearRef(); | |
| 201 url = url.ReplaceComponents(replacements); | |
| 202 } | |
| 203 | |
| 204 // Scheme component must be the same as the manifest URL's. | |
| 205 if (url.scheme() != manifest_url.scheme()) { | |
| 206 continue; | |
| 207 } | |
| 208 | |
| 209 // See http://code.google.com/p/chromium/issues/detail?id=69594 | |
| 210 // We willfully violate the HTML5 spec at this point in order | |
| 211 // to support the appcaching of cross-origin HTTPS resources. | |
| 212 // Per the spec, EXPLICIT cross-origin HTTS resources should be | |
| 213 // ignored here. We've opted for a milder constraint and allow | |
| 214 // caching unless the resource has a "no-store" header. That | |
| 215 // condition is enforced in AppCacheUpdateJob. | |
| 216 | |
| 217 if (mode == EXPLICIT) { | |
| 218 manifest.explicit_urls.insert(url.spec()); | |
| 219 } else { | |
| 220 bool is_pattern = HasPatternMatchingAnnotation(line_p, line_end); | |
| 221 manifest.online_whitelist_namespaces.push_back( | |
| 222 AppCacheNamespace(APPCACHE_NETWORK_NAMESPACE, url, GURL(), | |
| 223 is_pattern)); | |
| 224 } | |
| 225 } else if (mode == INTERCEPT) { | |
| 226 if (parse_mode != PARSE_MANIFEST_ALLOWING_INTERCEPTS) { | |
| 227 manifest.did_ignore_intercept_namespaces = true; | |
| 228 continue; | |
| 229 } | |
| 230 | |
| 231 // Lines of the form, | |
| 232 // <urlnamespace> <intercept_type> <targeturl> | |
| 233 const wchar_t* line_p = line.c_str(); | |
| 234 const wchar_t* line_end = line_p + line.length(); | |
| 235 | |
| 236 // Look for first whitespace separating the url namespace from | |
| 237 // the intercept type. | |
| 238 while (line_p < line_end && *line_p != '\t' && *line_p != ' ') | |
| 239 ++line_p; | |
| 240 | |
| 241 if (line_p == line_end) | |
| 242 continue; // There was no whitespace separating the URLs. | |
| 243 | |
| 244 base::string16 namespace_url16; | |
| 245 base::WideToUTF16(line.c_str(), line_p - line.c_str(), &namespace_url16); | |
| 246 GURL namespace_url = manifest_url.Resolve(namespace_url16); | |
| 247 if (!namespace_url.is_valid()) | |
| 248 continue; | |
| 249 if (namespace_url.has_ref()) { | |
| 250 GURL::Replacements replacements; | |
| 251 replacements.ClearRef(); | |
| 252 namespace_url = namespace_url.ReplaceComponents(replacements); | |
| 253 } | |
| 254 | |
| 255 // The namespace URL must have the same scheme, host and port | |
| 256 // as the manifest's URL. | |
| 257 if (manifest_url.GetOrigin() != namespace_url.GetOrigin()) | |
| 258 continue; | |
| 259 | |
| 260 // Skip whitespace separating namespace from the type. | |
| 261 while (line_p < line_end && (*line_p == '\t' || *line_p == ' ')) | |
| 262 ++line_p; | |
| 263 | |
| 264 // Look for whitespace separating the type from the target url. | |
| 265 const wchar_t* type_start = line_p; | |
| 266 while (line_p < line_end && *line_p != '\t' && *line_p != ' ') | |
| 267 ++line_p; | |
| 268 | |
| 269 // Look for a type value we understand, otherwise skip the line. | |
| 270 InterceptVerb verb = UNKNOWN_VERB; | |
| 271 std::wstring type(type_start, line_p - type_start); | |
| 272 if (type == L"return") { | |
| 273 verb = RETURN; | |
| 274 } else if (type == L"execute" && | |
| 275 base::CommandLine::ForCurrentProcess()->HasSwitch( | |
| 276 kEnableExecutableHandlers)) { | |
| 277 verb = EXECUTE; | |
| 278 } | |
| 279 if (verb == UNKNOWN_VERB) | |
| 280 continue; | |
| 281 | |
| 282 // Skip whitespace separating type from the target_url. | |
| 283 while (line_p < line_end && (*line_p == '\t' || *line_p == ' ')) | |
| 284 ++line_p; | |
| 285 | |
| 286 // Look for whitespace separating the URL from subsequent ignored tokens. | |
| 287 const wchar_t* target_url_start = line_p; | |
| 288 while (line_p < line_end && *line_p != '\t' && *line_p != ' ') | |
| 289 ++line_p; | |
| 290 | |
| 291 base::string16 target_url16; | |
| 292 base::WideToUTF16(target_url_start, line_p - target_url_start, | |
| 293 &target_url16); | |
| 294 GURL target_url = manifest_url.Resolve(target_url16); | |
| 295 if (!target_url.is_valid()) | |
| 296 continue; | |
| 297 | |
| 298 if (target_url.has_ref()) { | |
| 299 GURL::Replacements replacements; | |
| 300 replacements.ClearRef(); | |
| 301 target_url = target_url.ReplaceComponents(replacements); | |
| 302 } | |
| 303 if (manifest_url.GetOrigin() != target_url.GetOrigin()) | |
| 304 continue; | |
| 305 | |
| 306 bool is_pattern = HasPatternMatchingAnnotation(line_p, line_end); | |
| 307 manifest.intercept_namespaces.push_back( | |
| 308 AppCacheNamespace(APPCACHE_INTERCEPT_NAMESPACE, namespace_url, | |
| 309 target_url, is_pattern, verb == EXECUTE)); | |
| 310 } else if (mode == FALLBACK) { | |
| 311 const wchar_t* line_p = line.c_str(); | |
| 312 const wchar_t* line_end = line_p + line.length(); | |
| 313 | |
| 314 // Look for whitespace separating the two URLs | |
| 315 while (line_p < line_end && *line_p != '\t' && *line_p != ' ') | |
| 316 ++line_p; | |
| 317 | |
| 318 if (line_p == line_end) { | |
| 319 // There was no whitespace separating the URLs. | |
| 320 continue; | |
| 321 } | |
| 322 | |
| 323 base::string16 namespace_url16; | |
| 324 base::WideToUTF16(line.c_str(), line_p - line.c_str(), &namespace_url16); | |
| 325 GURL namespace_url = manifest_url.Resolve(namespace_url16); | |
| 326 if (!namespace_url.is_valid()) | |
| 327 continue; | |
| 328 if (namespace_url.has_ref()) { | |
| 329 GURL::Replacements replacements; | |
| 330 replacements.ClearRef(); | |
| 331 namespace_url = namespace_url.ReplaceComponents(replacements); | |
| 332 } | |
| 333 | |
| 334 // Fallback namespace URL must have the same scheme, host and port | |
| 335 // as the manifest's URL. | |
| 336 if (manifest_url.GetOrigin() != namespace_url.GetOrigin()) { | |
| 337 continue; | |
| 338 } | |
| 339 | |
| 340 // Skip whitespace separating fallback namespace from URL. | |
| 341 while (line_p < line_end && (*line_p == '\t' || *line_p == ' ')) | |
| 342 ++line_p; | |
| 343 | |
| 344 // Look for whitespace separating the URL from subsequent ignored tokens. | |
| 345 const wchar_t* fallback_start = line_p; | |
| 346 while (line_p < line_end && *line_p != '\t' && *line_p != ' ') | |
| 347 ++line_p; | |
| 348 | |
| 349 base::string16 fallback_url16; | |
| 350 base::WideToUTF16(fallback_start, line_p - fallback_start, | |
| 351 &fallback_url16); | |
| 352 GURL fallback_url = manifest_url.Resolve(fallback_url16); | |
| 353 if (!fallback_url.is_valid()) | |
| 354 continue; | |
| 355 if (fallback_url.has_ref()) { | |
| 356 GURL::Replacements replacements; | |
| 357 replacements.ClearRef(); | |
| 358 fallback_url = fallback_url.ReplaceComponents(replacements); | |
| 359 } | |
| 360 | |
| 361 // Fallback entry URL must have the same scheme, host and port | |
| 362 // as the manifest's URL. | |
| 363 if (manifest_url.GetOrigin() != fallback_url.GetOrigin()) { | |
| 364 continue; | |
| 365 } | |
| 366 | |
| 367 bool is_pattern = HasPatternMatchingAnnotation(line_p, line_end); | |
| 368 | |
| 369 // Store regardless of duplicate namespace URL. Only first match | |
| 370 // will ever be used. | |
| 371 manifest.fallback_namespaces.push_back( | |
| 372 AppCacheNamespace(APPCACHE_FALLBACK_NAMESPACE, namespace_url, | |
| 373 fallback_url, is_pattern)); | |
| 374 } else { | |
| 375 NOTREACHED(); | |
| 376 } | |
| 377 } | |
| 378 | |
| 379 return true; | |
| 380 } | |
| 381 | |
| 382 } // namespace content | |
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Chromium Code Reviews
Issue 469413003:
Rename appcache/manifest_parser* to appcache/appcache_manifest_parser*. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master