34b6c2b36e
Catch up with a Gecko change from a few years ago.
af910097a3
removed the mime-type check on data URLs.
This was the cause of wpt/xhr/data-uri.htm failing only on Chrome.
An Enterprise Policy as a safe measure has been added as protection.
Bug: 40487190, 40540384
Change-Id: Ia6a4f6b4c140cc8dd5bf4c5f52604f1c29408c1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5783226
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: mmenke <mmenke@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Yann Dago <ydago@chromium.org>
Reviewed-by: Sébastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1352747}
93 lines
3.8 KiB
C++
93 lines
3.8 KiB
C++
// Copyright 2011 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_BASE_DATA_URL_H_
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#define NET_BASE_DATA_URL_H_
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#include <string>
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#include <string_view>
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#include "base/memory/scoped_refptr.h"
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#include "net/base/net_errors.h"
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#include "net/base/net_export.h"
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class GURL;
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namespace net {
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class HttpResponseHeaders;
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// This command line switch provides a means to disable data URL whitespace
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// kKeepWhitespaceForDataUrls feature flag. This is set part of an enterprise
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// policy and is intended as a kill switch.
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inline constexpr std::string_view kRemoveWhitespaceForDataURLs =
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"remove-keep-whitespace-for-data-urls";
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// See RFC 2397 for a complete description of the 'data' URL scheme.
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//
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// Briefly, a 'data' URL has the form:
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//
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// data:[<mediatype>][;base64],<data>
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//
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// The <mediatype> is an Internet media type specification (with optional
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// parameters.) The appearance of ";base64" means that the data is encoded as
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// base64. Without ";base64", the data (as a sequence of octets) is represented
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// using ASCII encoding for octets inside the range of safe URL characters and
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// using the standard %xx hex encoding of URLs for octets outside that range.
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// If <mediatype> is omitted, it defaults to text/plain;charset=US-ASCII. As a
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// shorthand, "text/plain" can be omitted but the charset parameter supplied.
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//
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class NET_EXPORT DataURL {
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public:
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// This method can be used to parse a 'data' URL into its component pieces.
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//
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// |mime_type| and |charset| must be non-null and point to empty strings.
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//
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// If |data| is null, then the <data> section will not be parsed or validated.
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// If non-null, it must point to an empty string.
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//
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// The resulting mime_type is normalized to lowercase. The data is the
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// decoded data (e.g.., if the data URL specifies base64 encoding, then the
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// returned data is base64 decoded, and any %-escaped bytes are unescaped).
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//
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// If the media type value doesn't match the media-type production defined in
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// RFC 7231, mime_type will be set to the default value "text/plain". We
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// don't simply fail for this grammar violation since Chromium had been
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// accepting such invalid values. For example, <img> element with the src
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// attribute set to a data URL with an invalid media type "image" (without a
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// slash and subtype) had been displayed. However, the value this method will
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// store in mime_type argument can be used for generating other headers, etc.
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// This could lead to security vulnerability. We don't want to accept
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// arbitrary value and ask each caller to validate the return value.
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//
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// If the charset parameter is specified but its value doesn't match the
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// token production defined in RFC 7230, this method simply fails and returns
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// false.
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//
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// If there's any other grammar violation in the URL, then this method will
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// return false, and all passed in pointers will be unmodified. On success,
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// true is returned.
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[[nodiscard]] static bool Parse(const GURL& url,
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std::string* mime_type,
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std::string* charset,
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std::string* data);
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// Similar to parse, except that it also generates a bogus set of response
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// headers, with Content-Type populated, and takes a method. Only the "HEAD"
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// method modifies the response, resulting in a 0-length body. All arguments
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// except must be non-null. All std::string pointers must point to empty
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// strings, and |*headers| must be nullptr. Returns net::OK on success.
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[[nodiscard]] static Error BuildResponse(
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const GURL& url,
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std::string_view method,
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std::string* mime_type,
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std::string* charset,
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std::string* data,
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scoped_refptr<HttpResponseHeaders>* headers);
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};
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} // namespace net
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#endif // NET_BASE_DATA_URL_H_
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