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authorSteve Block <steveblock@google.com>2011-05-06 11:45:16 +0100
committerSteve Block <steveblock@google.com>2011-05-12 13:44:10 +0100
commitcad810f21b803229eb11403f9209855525a25d57 (patch)
tree29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/loader/CrossOriginPreflightResultCache.cpp
parent121b0cf4517156d0ac5111caf9830c51b69bae8f (diff)
downloadexternal_webkit-cad810f21b803229eb11403f9209855525a25d57.zip
external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz
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Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/loader/CrossOriginPreflightResultCache.cpp')
-rw-r--r--Source/WebCore/loader/CrossOriginPreflightResultCache.cpp192
1 files changed, 192 insertions, 0 deletions
diff --git a/Source/WebCore/loader/CrossOriginPreflightResultCache.cpp b/Source/WebCore/loader/CrossOriginPreflightResultCache.cpp
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+++ b/Source/WebCore/loader/CrossOriginPreflightResultCache.cpp
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+/*
+ * Copyright (C) 2008, 2009 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 COMPUTER, 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 COMPUTER, 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 "CrossOriginPreflightResultCache.h"
+
+#include "CrossOriginAccessControl.h"
+#include "ResourceResponse.h"
+#include <wtf/CurrentTime.h>
+#include <wtf/StdLibExtras.h>
+#include <wtf/Threading.h>
+
+namespace WebCore {
+
+using namespace std;
+
+// These values are at the discretion of the user agent.
+static const unsigned defaultPreflightCacheTimeoutSeconds = 5;
+static const unsigned maxPreflightCacheTimeoutSeconds = 600; // Should be short enough to minimize the risk of using a poisoned cache after switching to a secure network.
+
+static bool parseAccessControlMaxAge(const String& string, unsigned& expiryDelta)
+{
+ // FIXME: this will not do the correct thing for a number starting with a '+'
+ bool ok = false;
+ expiryDelta = string.toUIntStrict(&ok);
+ return ok;
+}
+
+template<class HashType>
+static void addToAccessControlAllowList(const String& string, unsigned start, unsigned end, HashSet<String, HashType>& set)
+{
+ StringImpl* stringImpl = string.impl();
+ if (!stringImpl)
+ return;
+
+ // Skip white space from start.
+ while (start <= end && isSpaceOrNewline((*stringImpl)[start]))
+ ++start;
+
+ // only white space
+ if (start > end)
+ return;
+
+ // Skip white space from end.
+ while (end && isSpaceOrNewline((*stringImpl)[end]))
+ --end;
+
+ set.add(string.substring(start, end - start + 1));
+}
+
+template<class HashType>
+static bool parseAccessControlAllowList(const String& string, HashSet<String, HashType>& set)
+{
+ unsigned start = 0;
+ size_t end;
+ while ((end = string.find(',', start)) != notFound) {
+ if (start == end)
+ return false;
+
+ addToAccessControlAllowList(string, start, end - 1, set);
+ start = end + 1;
+ }
+ if (start != string.length())
+ addToAccessControlAllowList(string, start, string.length() - 1, set);
+
+ return true;
+}
+
+bool CrossOriginPreflightResultCacheItem::parse(const ResourceResponse& response, String& errorDescription)
+{
+ m_methods.clear();
+ if (!parseAccessControlAllowList(response.httpHeaderField("Access-Control-Allow-Methods"), m_methods)) {
+ errorDescription = "Cannot parse Access-Control-Allow-Methods response header field.";
+ return false;
+ }
+
+ m_headers.clear();
+ if (!parseAccessControlAllowList(response.httpHeaderField("Access-Control-Allow-Headers"), m_headers)) {
+ errorDescription = "Cannot parse Access-Control-Allow-Headers response header field.";
+ return false;
+ }
+
+ unsigned expiryDelta;
+ if (parseAccessControlMaxAge(response.httpHeaderField("Access-Control-Max-Age"), expiryDelta)) {
+ if (expiryDelta > maxPreflightCacheTimeoutSeconds)
+ expiryDelta = maxPreflightCacheTimeoutSeconds;
+ } else
+ expiryDelta = defaultPreflightCacheTimeoutSeconds;
+
+ m_absoluteExpiryTime = currentTime() + expiryDelta;
+ return true;
+}
+
+bool CrossOriginPreflightResultCacheItem::allowsCrossOriginMethod(const String& method, String& errorDescription) const
+{
+ if (m_methods.contains(method) || isOnAccessControlSimpleRequestMethodWhitelist(method))
+ return true;
+
+ errorDescription = "Method " + method + " is not allowed by Access-Control-Allow-Methods.";
+ return false;
+}
+
+bool CrossOriginPreflightResultCacheItem::allowsCrossOriginHeaders(const HTTPHeaderMap& requestHeaders, String& errorDescription) const
+{
+ HTTPHeaderMap::const_iterator end = requestHeaders.end();
+ for (HTTPHeaderMap::const_iterator it = requestHeaders.begin(); it != end; ++it) {
+ if (!m_headers.contains(it->first) && !isOnAccessControlSimpleRequestHeaderWhitelist(it->first, it->second)) {
+ errorDescription = "Request header field " + it->first.string() + " is not allowed by Access-Control-Allow-Headers.";
+ return false;
+ }
+ }
+ return true;
+}
+
+bool CrossOriginPreflightResultCacheItem::allowsRequest(bool includeCredentials, const String& method, const HTTPHeaderMap& requestHeaders) const
+{
+ String ignoredExplanation;
+ if (m_absoluteExpiryTime < currentTime())
+ return false;
+ if (includeCredentials && !m_credentials)
+ return false;
+ if (!allowsCrossOriginMethod(method, ignoredExplanation))
+ return false;
+ if (!allowsCrossOriginHeaders(requestHeaders, ignoredExplanation))
+ return false;
+ return true;
+}
+
+CrossOriginPreflightResultCache& CrossOriginPreflightResultCache::shared()
+{
+ DEFINE_STATIC_LOCAL(CrossOriginPreflightResultCache, cache, ());
+ ASSERT(isMainThread());
+ return cache;
+}
+
+void CrossOriginPreflightResultCache::appendEntry(const String& origin, const KURL& url, PassOwnPtr<CrossOriginPreflightResultCacheItem> preflightResult)
+{
+ ASSERT(isMainThread());
+ CrossOriginPreflightResultCacheItem* resultPtr = preflightResult.leakPtr();
+ pair<CrossOriginPreflightResultHashMap::iterator, bool> addResult = m_preflightHashMap.add(make_pair(origin, url), resultPtr);
+ if (!addResult.second) {
+ // FIXME: We need to delete the old value before replacing with the new one.
+ addResult.first->second = resultPtr;
+ }
+}
+
+bool CrossOriginPreflightResultCache::canSkipPreflight(const String& origin, const KURL& url, bool includeCredentials, const String& method, const HTTPHeaderMap& requestHeaders)
+{
+ ASSERT(isMainThread());
+ CrossOriginPreflightResultHashMap::iterator cacheIt = m_preflightHashMap.find(std::make_pair(origin, url));
+ if (cacheIt == m_preflightHashMap.end())
+ return false;
+
+ if (cacheIt->second->allowsRequest(includeCredentials, method, requestHeaders))
+ return true;
+
+ delete cacheIt->second;
+ m_preflightHashMap.remove(cacheIt);
+ return false;
+}
+
+void CrossOriginPreflightResultCache::empty()
+{
+ ASSERT(isMainThread());
+ deleteAllValues(m_preflightHashMap);
+ m_preflightHashMap.clear();
+}
+
+} // namespace WebCore