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68 lines
2.7 KiB
C
68 lines
2.7 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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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 "net/base/net_export.h"
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class GURL;
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namespace net {
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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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// 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. Output variables may be changed and contain invalid data. On
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// success, true is returned.
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//
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// OPTIONAL: If |data| is NULL, then the <data> section will not be parsed
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// or validated.
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//
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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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};
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} // namespace net
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#endif // NET_BASE_DATA_URL_H_
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