Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
| 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| 17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| 21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 24 | * |
| 25 | */ |
| 26 | |
| 27 | #include "config.h" |
| 28 | #include "core/loader/CrossOriginPreflightResultCache.h" |
| 29 | |
| 30 | #include "core/loader/CrossOriginAccessControl.h" |
| 31 | #include "core/platform/network/ResourceResponse.h" |
Ben Murdoch | e69819b | 2013-07-17 14:56:49 +0100 | [diff] [blame] | 32 | #include "wtf/CurrentTime.h" |
| 33 | #include "wtf/MainThread.h" |
| 34 | #include "wtf/StdLibExtras.h" |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 35 | |
| 36 | namespace WebCore { |
| 37 | |
| 38 | using namespace std; |
| 39 | |
| 40 | // These values are at the discretion of the user agent. |
| 41 | static const unsigned defaultPreflightCacheTimeoutSeconds = 5; |
| 42 | static const unsigned maxPreflightCacheTimeoutSeconds = 600; // Should be short enough to minimize the risk of using a poisoned cache after switching to a secure network. |
| 43 | |
| 44 | static bool parseAccessControlMaxAge(const String& string, unsigned& expiryDelta) |
| 45 | { |
| 46 | // FIXME: this will not do the correct thing for a number starting with a '+' |
| 47 | bool ok = false; |
| 48 | expiryDelta = string.toUIntStrict(&ok); |
| 49 | return ok; |
| 50 | } |
| 51 | |
| 52 | template<class HashType> |
| 53 | static void addToAccessControlAllowList(const String& string, unsigned start, unsigned end, HashSet<String, HashType>& set) |
| 54 | { |
| 55 | StringImpl* stringImpl = string.impl(); |
| 56 | if (!stringImpl) |
| 57 | return; |
| 58 | |
| 59 | // Skip white space from start. |
| 60 | while (start <= end && isSpaceOrNewline((*stringImpl)[start])) |
| 61 | ++start; |
| 62 | |
| 63 | // only white space |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 64 | if (start > end) |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 65 | return; |
| 66 | |
| 67 | // Skip white space from end. |
| 68 | while (end && isSpaceOrNewline((*stringImpl)[end])) |
| 69 | --end; |
| 70 | |
| 71 | set.add(string.substring(start, end - start + 1)); |
| 72 | } |
| 73 | |
| 74 | template<class HashType> |
| 75 | static bool parseAccessControlAllowList(const String& string, HashSet<String, HashType>& set) |
| 76 | { |
| 77 | unsigned start = 0; |
| 78 | size_t end; |
| 79 | while ((end = string.find(',', start)) != notFound) { |
| 80 | if (start != end) |
| 81 | addToAccessControlAllowList(string, start, end - 1, set); |
| 82 | start = end + 1; |
| 83 | } |
| 84 | if (start != string.length()) |
| 85 | addToAccessControlAllowList(string, start, string.length() - 1, set); |
| 86 | |
| 87 | return true; |
| 88 | } |
| 89 | |
| 90 | bool CrossOriginPreflightResultCacheItem::parse(const ResourceResponse& response, String& errorDescription) |
| 91 | { |
| 92 | m_methods.clear(); |
| 93 | if (!parseAccessControlAllowList(response.httpHeaderField("Access-Control-Allow-Methods"), m_methods)) { |
| 94 | errorDescription = "Cannot parse Access-Control-Allow-Methods response header field."; |
| 95 | return false; |
| 96 | } |
| 97 | |
| 98 | m_headers.clear(); |
| 99 | if (!parseAccessControlAllowList(response.httpHeaderField("Access-Control-Allow-Headers"), m_headers)) { |
| 100 | errorDescription = "Cannot parse Access-Control-Allow-Headers response header field."; |
| 101 | return false; |
| 102 | } |
| 103 | |
| 104 | unsigned expiryDelta; |
| 105 | if (parseAccessControlMaxAge(response.httpHeaderField("Access-Control-Max-Age"), expiryDelta)) { |
| 106 | if (expiryDelta > maxPreflightCacheTimeoutSeconds) |
| 107 | expiryDelta = maxPreflightCacheTimeoutSeconds; |
| 108 | } else |
| 109 | expiryDelta = defaultPreflightCacheTimeoutSeconds; |
| 110 | |
| 111 | m_absoluteExpiryTime = currentTime() + expiryDelta; |
| 112 | return true; |
| 113 | } |
| 114 | |
| 115 | bool CrossOriginPreflightResultCacheItem::allowsCrossOriginMethod(const String& method, String& errorDescription) const |
| 116 | { |
| 117 | if (m_methods.contains(method) || isOnAccessControlSimpleRequestMethodWhitelist(method)) |
| 118 | return true; |
| 119 | |
| 120 | errorDescription = "Method " + method + " is not allowed by Access-Control-Allow-Methods."; |
| 121 | return false; |
| 122 | } |
| 123 | |
| 124 | bool CrossOriginPreflightResultCacheItem::allowsCrossOriginHeaders(const HTTPHeaderMap& requestHeaders, String& errorDescription) const |
| 125 | { |
| 126 | HTTPHeaderMap::const_iterator end = requestHeaders.end(); |
| 127 | for (HTTPHeaderMap::const_iterator it = requestHeaders.begin(); it != end; ++it) { |
| 128 | if (!m_headers.contains(it->key) && !isOnAccessControlSimpleRequestHeaderWhitelist(it->key, it->value)) { |
| 129 | errorDescription = "Request header field " + it->key.string() + " is not allowed by Access-Control-Allow-Headers."; |
| 130 | return false; |
| 131 | } |
| 132 | } |
| 133 | return true; |
| 134 | } |
| 135 | |
| 136 | bool CrossOriginPreflightResultCacheItem::allowsRequest(StoredCredentials includeCredentials, const String& method, const HTTPHeaderMap& requestHeaders) const |
| 137 | { |
| 138 | String ignoredExplanation; |
| 139 | if (m_absoluteExpiryTime < currentTime()) |
| 140 | return false; |
| 141 | if (includeCredentials == AllowStoredCredentials && m_credentials == DoNotAllowStoredCredentials) |
| 142 | return false; |
| 143 | if (!allowsCrossOriginMethod(method, ignoredExplanation)) |
| 144 | return false; |
| 145 | if (!allowsCrossOriginHeaders(requestHeaders, ignoredExplanation)) |
| 146 | return false; |
| 147 | return true; |
| 148 | } |
| 149 | |
| 150 | CrossOriginPreflightResultCache& CrossOriginPreflightResultCache::shared() |
| 151 | { |
| 152 | DEFINE_STATIC_LOCAL(CrossOriginPreflightResultCache, cache, ()); |
| 153 | ASSERT(isMainThread()); |
| 154 | return cache; |
| 155 | } |
| 156 | |
| 157 | void CrossOriginPreflightResultCache::appendEntry(const String& origin, const KURL& url, PassOwnPtr<CrossOriginPreflightResultCacheItem> preflightResult) |
| 158 | { |
| 159 | ASSERT(isMainThread()); |
| 160 | m_preflightHashMap.set(make_pair(origin, url), preflightResult); |
| 161 | } |
| 162 | |
| 163 | bool CrossOriginPreflightResultCache::canSkipPreflight(const String& origin, const KURL& url, StoredCredentials includeCredentials, const String& method, const HTTPHeaderMap& requestHeaders) |
| 164 | { |
| 165 | ASSERT(isMainThread()); |
| 166 | CrossOriginPreflightResultHashMap::iterator cacheIt = m_preflightHashMap.find(make_pair(origin, url)); |
| 167 | if (cacheIt == m_preflightHashMap.end()) |
| 168 | return false; |
| 169 | |
| 170 | if (cacheIt->value->allowsRequest(includeCredentials, method, requestHeaders)) |
| 171 | return true; |
| 172 | |
| 173 | m_preflightHashMap.remove(cacheIt); |
| 174 | return false; |
| 175 | } |
| 176 | |
| 177 | void CrossOriginPreflightResultCache::empty() |
| 178 | { |
| 179 | ASSERT(isMainThread()); |
| 180 | m_preflightHashMap.clear(); |
| 181 | } |
| 182 | |
| 183 | } // namespace WebCore |