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/*
* Copyright (C) 2008 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.
*
*/
#ifndef CrossOriginAccessControl_h
#define CrossOriginAccessControl_h
#include "core/CoreExport.h"
#include "core/fetch/ResourceLoaderOptions.h"
#include "platform/network/ResourceRequest.h"
#include "wtf/Allocator.h"
#include "wtf/Forward.h"
#include "wtf/HashSet.h"
#include "wtf/PassRefPtr.h"
namespace blink {
using HTTPHeaderSet = HashSet<String, CaseFoldingHash>;
struct ResourceLoaderOptions;
class ResourceRequest;
class ResourceResponse;
class SecurityOrigin;
class CrossOriginAccessControl {
STATIC_ONLY(CrossOriginAccessControl);
public:
// Enumerating the error conditions that the CORS
// access control check can report, including success.
//
// See |checkAccess()| and |accessControlErrorString()| which respectively
// produce and consume these error values, for precise meaning.
enum AccessStatus {
kAccessAllowed,
kInvalidResponse,
kAllowOriginMismatch,
kSubOriginMismatch,
kWildcardOriginNotAllowed,
kMissingAllowOriginHeader,
kMultipleAllowOriginValues,
kInvalidAllowOriginValue,
kDisallowCredentialsNotSetToTrue,
};
// Enumerating the error conditions that CORS preflight
// can report, including success.
//
// See |checkPreflight()| methods and |preflightErrorString()| which
// respectively produce and consume these error values, for precise meaning.
enum PreflightStatus {
kPreflightSuccess,
kPreflightInvalidStatus,
// "Access-Control-Allow-External:"
// ( https://wicg.github.io/cors-rfc1918/#headers ) specific error
// conditions:
kPreflightMissingAllowExternal,
kPreflightInvalidAllowExternal,
};
// Enumerating the error conditions that CORS redirect target URL
// checks can report, including success.
//
// See |checkRedirectLocation()| methods and |redirectErrorString()| which
// respectively produce and consume these error values, for precise meaning.
enum RedirectStatus {
kRedirectSuccess,
kRedirectDisallowedScheme,
kRedirectContainsCredentials,
};
// Perform a CORS access check on the response. Returns |kAccessAllowed| if
// access is allowed. Use |accessControlErrorString()| to construct a
// user-friendly error message for any of the other (error) conditions.
static AccessStatus checkAccess(const ResourceResponse&,
StoredCredentials,
const SecurityOrigin*);
// Perform the required CORS checks on the response to a preflight request.
// Returns |kPreflightSuccess| if preflight response was successful.
// Use |preflightErrorString()| to construct a user-friendly error message
// for any of the other (error) conditions.
static PreflightStatus checkPreflight(const ResourceResponse&);
// Error checking for the currently experimental
// "Access-Control-Allow-External:" header. Shares error conditions with
// standard preflight checking.
static PreflightStatus checkExternalPreflight(const ResourceResponse&);
// Given a redirected-to URL, check if the location is allowed
// according to CORS. That is:
// - the URL has a CORS supported scheme and
// - the URL does not contain the userinfo production.
//
// Returns |kRedirectSuccess| in all other cases. Use
// |redirectErrorString()| to construct a user-friendly error
// message for any of the error conditions.
static RedirectStatus checkRedirectLocation(const KURL&);
static bool handleRedirect(PassRefPtr<SecurityOrigin>,
ResourceRequest&,
const ResourceResponse&,
StoredCredentials,
ResourceLoaderOptions&,
String&);
// Stringify errors from CORS access checks, preflight or redirect checks.
static void accessControlErrorString(StringBuilder&,
AccessStatus,
const ResourceResponse&,
const SecurityOrigin*,
WebURLRequest::RequestContext);
static void preflightErrorString(StringBuilder&,
PreflightStatus,
const ResourceResponse&);
static void redirectErrorString(StringBuilder&, RedirectStatus, const KURL&);
};
// TODO: also migrate these into the above static class.
CORE_EXPORT bool isOnAccessControlResponseHeaderWhitelist(const String&);
CORE_EXPORT ResourceRequest
createAccessControlPreflightRequest(const ResourceRequest&);
CORE_EXPORT void parseAccessControlExposeHeadersAllowList(
const String& headerValue,
HTTPHeaderSet&);
CORE_EXPORT void extractCorsExposedHeaderNamesList(const ResourceResponse&,
HTTPHeaderSet&);
} // namespace blink
#endif // CrossOriginAccessControl_h
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