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/*
* Copyright (C) 2008-2017 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ManifestParser.h"
#include "TextResourceDecoder.h"
#include "URL.h"
#include <wtf/text/StringView.h>
#include <wtf/unicode/CharacterNames.h>
namespace WebCore {
enum Mode { Explicit, Fallback, OnlineWhitelist, Unknown };
static String manifestPath(const URL& manifestURL)
{
String manifestPath = manifestURL.path();
ASSERT(manifestPath[0] == '/');
manifestPath = manifestPath.substring(0, manifestPath.reverseFind('/') + 1);
ASSERT(manifestPath[0] == manifestPath[manifestPath.length() - 1]);
return manifestPath;
}
bool parseManifest(const URL& manifestURL, const String& manifestMIMEType, const char* data, int length, Manifest& manifest)
{
ASSERT(manifest.explicitURLs.isEmpty());
ASSERT(manifest.onlineWhitelistedURLs.isEmpty());
ASSERT(manifest.fallbackURLs.isEmpty());
manifest.allowAllNetworkRequests = false;
String manifestPath = WebCore::manifestPath(manifestURL);
const char cacheManifestMIMEType[] = "text/cache-manifest";
bool allowFallbackNamespaceOutsideManfestPath = equalLettersIgnoringASCIICase(manifestMIMEType, cacheManifestMIMEType);
Mode mode = Explicit;
String manifestString = TextResourceDecoder::create(ASCIILiteral(cacheManifestMIMEType), "UTF-8")->decodeAndFlush(data, length);
// Look for the magic signature: "^\xFEFF?CACHE MANIFEST[ \t]?" (the BOM is removed by TextResourceDecoder).
// Example: "CACHE MANIFEST #comment" is a valid signature.
// Example: "CACHE MANIFEST;V2" is not.
const char manifestSignature[] = "CACHE MANIFEST";
if (!manifestString.startsWith(manifestSignature))
return false;
StringView manifestAfterSignature = StringView(manifestString).substring(sizeof(manifestSignature) - 1);
auto upconvertedCharacters = manifestAfterSignature.upconvertedCharacters();
const UChar* p = upconvertedCharacters;
const UChar* end = p + manifestAfterSignature.length();
if (p < end && *p != ' ' && *p != '\t' && *p != '\n' && *p != '\r')
return false;
// Skip to the end of the line.
while (p < end && *p != '\r' && *p != '\n')
p++;
while (1) {
// Skip whitespace
while (p < end && (*p == '\n' || *p == '\r' || *p == ' ' || *p == '\t'))
p++;
if (p == end)
break;
const UChar* lineStart = p;
// Find the end of the line
while (p < end && *p != '\r' && *p != '\n')
p++;
// Check if we have a comment
if (*lineStart == '#')
continue;
// Get rid of trailing whitespace
const UChar* tmp = p - 1;
while (tmp > lineStart && (*tmp == ' ' || *tmp == '\t'))
tmp--;
String line(lineStart, tmp - lineStart + 1);
if (line == "CACHE:")
mode = Explicit;
else if (line == "FALLBACK:")
mode = Fallback;
else if (line == "NETWORK:")
mode = OnlineWhitelist;
else if (line.endsWith(':'))
mode = Unknown;
else if (mode == Unknown)
continue;
else if (mode == Explicit || mode == OnlineWhitelist) {
auto upconvertedLineCharacters = StringView(line).upconvertedCharacters();
const UChar* p = upconvertedLineCharacters;
const UChar* lineEnd = p + line.length();
// Look for whitespace separating the URL from subsequent ignored tokens.
while (p < lineEnd && *p != '\t' && *p != ' ')
p++;
if (mode == OnlineWhitelist && p - upconvertedLineCharacters == 1 && line[0] == '*') {
// Wildcard was found.
manifest.allowAllNetworkRequests = true;
continue;
}
URL url(manifestURL, line.substring(0, p - upconvertedLineCharacters));
if (!url.isValid())
continue;
url.removeFragmentIdentifier();
if (!equalIgnoringASCIICase(url.protocol(), manifestURL.protocol()))
continue;
if (mode == Explicit && manifestURL.protocolIs("https") && !protocolHostAndPortAreEqual(manifestURL, url))
continue;
if (mode == Explicit)
manifest.explicitURLs.add(url.string());
else
manifest.onlineWhitelistedURLs.append(url);
} else if (mode == Fallback) {
auto upconvertedLineCharacters = StringView(line).upconvertedCharacters();
const UChar* p = upconvertedLineCharacters;
const UChar* lineEnd = p + line.length();
// Look for whitespace separating the two URLs
while (p < lineEnd && *p != '\t' && *p != ' ')
p++;
if (p == lineEnd) {
// There was no whitespace separating the URLs.
continue;
}
URL namespaceURL(manifestURL, line.substring(0, p - upconvertedLineCharacters));
if (!namespaceURL.isValid())
continue;
namespaceURL.removeFragmentIdentifier();
if (!protocolHostAndPortAreEqual(manifestURL, namespaceURL))
continue;
// Although <https://html.spec.whatwg.org/multipage/offline.html#parsing-cache-manifests> (07/06/2017) saids
// that we should always prefix match the manifest path we only do so if the manifest was served with a non-
// standard HTTP Content-Type header for web compatibility.
if (!allowFallbackNamespaceOutsideManfestPath && !namespaceURL.path().startsWith(manifestPath))
continue;
// Skip whitespace separating fallback namespace from URL.
while (p < lineEnd && (*p == '\t' || *p == ' '))
p++;
// Look for whitespace separating the URL from subsequent ignored tokens.
const UChar* fallbackStart = p;
while (p < lineEnd && *p != '\t' && *p != ' ')
p++;
URL fallbackURL(manifestURL, String(fallbackStart, p - fallbackStart));
if (!fallbackURL.isValid())
continue;
fallbackURL.removeFragmentIdentifier();
if (!protocolHostAndPortAreEqual(manifestURL, fallbackURL))
continue;
manifest.fallbackURLs.append(std::make_pair(namespaceURL, fallbackURL));
} else
ASSERT_NOT_REACHED();
}
return true;
}
}
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