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28 #include "core/loader/CrossOriginPreflightResultCache.h"
30 #include "core/fetch/FetchUtils.h"
31 #include "platform/network/ResourceResponse.h"
32 #include "wtf/CurrentTime.h"
33 #include "wtf/MainThread.h"
34 #include "wtf/StdLibExtras.h"
38 // These values are at the discretion of the user agent.
39 static const unsigned defaultPreflightCacheTimeoutSeconds = 5;
40 static const unsigned maxPreflightCacheTimeoutSeconds = 600; // Should be short enough to minimize the risk of using a poisoned cache after switching to a secure network.
42 static bool parseAccessControlMaxAge(const String& string, unsigned& expiryDelta)
44 // FIXME: this will not do the correct thing for a number starting with a '+'
46 expiryDelta = string.toUIntStrict(&ok);
50 template<class HashType>
51 static void addToAccessControlAllowList(const String& string, unsigned start, unsigned end, HashSet<String, HashType>& set)
53 StringImpl* stringImpl = string.impl();
57 // Skip white space from start.
58 while (start <= end && isSpaceOrNewline((*stringImpl)[start]))
65 // Skip white space from end.
66 while (end && isSpaceOrNewline((*stringImpl)[end]))
69 set.add(string.substring(start, end - start + 1));
72 template<class HashType>
73 static bool parseAccessControlAllowList(const String& string, HashSet<String, HashType>& set)
77 while ((end = string.find(',', start)) != kNotFound) {
79 addToAccessControlAllowList(string, start, end - 1, set);
82 if (start != string.length())
83 addToAccessControlAllowList(string, start, string.length() - 1, set);
88 bool CrossOriginPreflightResultCacheItem::parse(const ResourceResponse& response, String& errorDescription)
91 if (!parseAccessControlAllowList(response.httpHeaderField("Access-Control-Allow-Methods"), m_methods)) {
92 errorDescription = "Cannot parse Access-Control-Allow-Methods response header field.";
97 if (!parseAccessControlAllowList(response.httpHeaderField("Access-Control-Allow-Headers"), m_headers)) {
98 errorDescription = "Cannot parse Access-Control-Allow-Headers response header field.";
102 unsigned expiryDelta;
103 if (parseAccessControlMaxAge(response.httpHeaderField("Access-Control-Max-Age"), expiryDelta)) {
104 if (expiryDelta > maxPreflightCacheTimeoutSeconds)
105 expiryDelta = maxPreflightCacheTimeoutSeconds;
107 expiryDelta = defaultPreflightCacheTimeoutSeconds;
110 m_absoluteExpiryTime = currentTime() + expiryDelta;
114 bool CrossOriginPreflightResultCacheItem::allowsCrossOriginMethod(const String& method, String& errorDescription) const
116 if (m_methods.contains(method) || FetchUtils::isSimpleMethod(method))
119 errorDescription = "Method " + method + " is not allowed by Access-Control-Allow-Methods.";
123 bool CrossOriginPreflightResultCacheItem::allowsCrossOriginHeaders(const HTTPHeaderMap& requestHeaders, String& errorDescription) const
125 HTTPHeaderMap::const_iterator end = requestHeaders.end();
126 for (HTTPHeaderMap::const_iterator it = requestHeaders.begin(); it != end; ++it) {
127 if (!m_headers.contains(it->key) && !FetchUtils::isSimpleHeader(it->key, it->value) && !FetchUtils::isForbiddenHeaderName(it->key)) {
128 errorDescription = "Request header field " + it->key.string() + " is not allowed by Access-Control-Allow-Headers.";
135 bool CrossOriginPreflightResultCacheItem::allowsRequest(StoredCredentials includeCredentials, const String& method, const HTTPHeaderMap& requestHeaders) const
137 String ignoredExplanation;
138 if (m_absoluteExpiryTime < currentTime())
140 if (includeCredentials == AllowStoredCredentials && m_credentials == DoNotAllowStoredCredentials)
142 if (!allowsCrossOriginMethod(method, ignoredExplanation))
144 if (!allowsCrossOriginHeaders(requestHeaders, ignoredExplanation))
149 CrossOriginPreflightResultCache& CrossOriginPreflightResultCache::shared()
151 DEFINE_STATIC_LOCAL(CrossOriginPreflightResultCache, cache, ());
152 ASSERT(isMainThread());
156 void CrossOriginPreflightResultCache::appendEntry(const String& origin, const KURL& url, PassOwnPtr<CrossOriginPreflightResultCacheItem> preflightResult)
158 ASSERT(isMainThread());
159 m_preflightHashMap.set(std::make_pair(origin, url), preflightResult);
162 bool CrossOriginPreflightResultCache::canSkipPreflight(const String& origin, const KURL& url, StoredCredentials includeCredentials, const String& method, const HTTPHeaderMap& requestHeaders)
164 ASSERT(isMainThread());
165 CrossOriginPreflightResultHashMap::iterator cacheIt = m_preflightHashMap.find(std::make_pair(origin, url));
166 if (cacheIt == m_preflightHashMap.end())
169 if (cacheIt->value->allowsRequest(includeCredentials, method, requestHeaders))
172 m_preflightHashMap.remove(cacheIt);