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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/public/common/mime_util/mime_util.h"
#include <stddef.h>
#include <unordered_set>
#include "base/lazy_instance.h"
#include "base/strings/string_util.h"
#include "build/build_config.h"
#include "media/media_buildflags.h"
#include "net/base/mime_util.h"
#include "third_party/blink/public/common/buildflags.h"
#include "third_party/blink/public/common/features.h"
#if !defined(OS_IOS)
// iOS doesn't use and must not depend on //media
#include "media/base/mime_util.h"
#endif
namespace blink {
namespace {
// From WebKit's WebCore/platform/MIMETypeRegistry.cpp:
const char* const kSupportedImageTypes[] = {
"image/jpeg",
"image/pjpeg",
"image/jpg",
"image/webp",
"image/png",
"image/apng",
"image/gif",
"image/bmp",
"image/vnd.microsoft.icon", // ico
"image/x-icon", // ico
"image/x-xbitmap", // xbm
"image/x-png",
#if BUILDFLAG(ENABLE_AV1_DECODER)
"image/avif",
#endif
};
// Support every script type mentioned in the spec, as it notes that "User
// agents must recognize all JavaScript MIME types." See
// https://html.spec.whatwg.org/#javascript-mime-type.
const char* const kSupportedJavascriptTypes[] = {
"application/ecmascript",
"application/javascript",
"application/x-ecmascript",
"application/x-javascript",
"text/ecmascript",
"text/javascript",
"text/javascript1.0",
"text/javascript1.1",
"text/javascript1.2",
"text/javascript1.3",
"text/javascript1.4",
"text/javascript1.5",
"text/jscript",
"text/livescript",
"text/x-ecmascript",
"text/x-javascript",
};
// These types are excluded from the logic that allows all text/ types because
// while they are technically text, it's very unlikely that a user expects to
// see them rendered in text form.
static const char* const kUnsupportedTextTypes[] = {
"text/calendar",
"text/x-calendar",
"text/x-vcalendar",
"text/vcalendar",
"text/vcard",
"text/x-vcard",
"text/directory",
"text/ldif",
"text/qif",
"text/x-qif",
"text/x-csv",
"text/x-vcf",
"text/rtf",
"text/comma-separated-values",
"text/csv",
"text/tab-separated-values",
"text/tsv",
"text/ofx", // https://crbug.com/162238
"text/vnd.sun.j2me.app-descriptor", // https://crbug.com/176450
"text/x-ms-iqy", // https://crbug.com/1054863
"text/x-ms-odc", // https://crbug.com/1054863
"text/x-ms-rqy", // https://crbug.com/1054863
"text/x-ms-contact" // https://crbug.com/1054863
};
// Note:
// - does not include javascript types list (see supported_javascript_types)
// - does not include types starting with "text/" (see
// IsSupportedNonImageMimeType())
static const char* const kSupportedNonImageTypes[] = {
"image/svg+xml", // SVG is text-based XML, even though it has an image/
// type
"application/xml", "application/atom+xml", "application/rss+xml",
"application/xhtml+xml", "application/json",
"message/rfc822", // For MHTML support.
"multipart/related", // For MHTML support.
"multipart/x-mixed-replace"
// Note: ADDING a new type here will probably render it AS HTML. This can
// result in cross site scripting.
};
// Singleton utility class for mime types
class MimeUtil {
public:
MimeUtil(const MimeUtil&) = delete;
MimeUtil& operator=(const MimeUtil&) = delete;
bool IsSupportedImageMimeType(const std::string& mime_type) const;
bool IsSupportedNonImageMimeType(const std::string& mime_type) const;
bool IsUnsupportedTextMimeType(const std::string& mime_type) const;
bool IsSupportedJavascriptMimeType(const std::string& mime_type) const;
bool IsJSONMimeType(const std::string&) const;
bool IsSupportedMimeType(const std::string& mime_type) const;
private:
friend struct base::LazyInstanceTraitsBase<MimeUtil>;
using MimeTypes = std::unordered_set<std::string>;
MimeUtil();
MimeTypes image_types_;
MimeTypes non_image_types_;
MimeTypes unsupported_text_types_;
MimeTypes javascript_types_;
};
MimeUtil::MimeUtil() {
for (const char* type : kSupportedNonImageTypes)
non_image_types_.insert(type);
for (const char* type : kSupportedImageTypes)
image_types_.insert(type);
#if BUILDFLAG(ENABLE_JXL_DECODER)
// TODO(firsching): Add "image/jxl" to the kSupportedImageTypes array when the
// JXL feature is shipped.
if (base::FeatureList::IsEnabled(features::kJXL))
image_types_.insert("image/jxl");
#endif
for (const char* type : kUnsupportedTextTypes)
unsupported_text_types_.insert(type);
for (const char* type : kSupportedJavascriptTypes) {
javascript_types_.insert(type);
non_image_types_.insert(type);
}
}
bool MimeUtil::IsSupportedImageMimeType(const std::string& mime_type) const {
return image_types_.find(base::ToLowerASCII(mime_type)) != image_types_.end();
}
bool MimeUtil::IsSupportedNonImageMimeType(const std::string& mime_type) const {
return non_image_types_.find(base::ToLowerASCII(mime_type)) !=
non_image_types_.end() ||
#if !defined(OS_IOS)
media::IsSupportedMediaMimeType(mime_type) ||
#endif
(base::StartsWith(mime_type, "text/",
base::CompareCase::INSENSITIVE_ASCII) &&
!IsUnsupportedTextMimeType(mime_type)) ||
(base::StartsWith(mime_type, "application/",
base::CompareCase::INSENSITIVE_ASCII) &&
net::MatchesMimeType("application/*+json", mime_type));
}
bool MimeUtil::IsUnsupportedTextMimeType(const std::string& mime_type) const {
return unsupported_text_types_.find(base::ToLowerASCII(mime_type)) !=
unsupported_text_types_.end();
}
bool MimeUtil::IsSupportedJavascriptMimeType(
const std::string& mime_type) const {
return javascript_types_.find(mime_type) != javascript_types_.end();
}
// TODO(sasebree): Allow non-application `*/*+json` MIME types.
// https://mimesniff.spec.whatwg.org/#json-mime-type
bool MimeUtil::IsJSONMimeType(const std::string& mime_type) const {
return net::MatchesMimeType("application/json", mime_type) ||
net::MatchesMimeType("text/json", mime_type) ||
net::MatchesMimeType("application/*+json", mime_type);
}
bool MimeUtil::IsSupportedMimeType(const std::string& mime_type) const {
return (base::StartsWith(mime_type, "image/",
base::CompareCase::INSENSITIVE_ASCII) &&
IsSupportedImageMimeType(mime_type)) ||
IsSupportedNonImageMimeType(mime_type);
}
// This variable is Leaky because it is accessed from WorkerPool threads.
static base::LazyInstance<MimeUtil>::Leaky g_mime_util =
LAZY_INSTANCE_INITIALIZER;
} // namespace
bool IsSupportedImageMimeType(const std::string& mime_type) {
return g_mime_util.Get().IsSupportedImageMimeType(mime_type);
}
bool IsSupportedNonImageMimeType(const std::string& mime_type) {
return g_mime_util.Get().IsSupportedNonImageMimeType(mime_type);
}
bool IsUnsupportedTextMimeType(const std::string& mime_type) {
return g_mime_util.Get().IsUnsupportedTextMimeType(mime_type);
}
bool IsSupportedJavascriptMimeType(const std::string& mime_type) {
return g_mime_util.Get().IsSupportedJavascriptMimeType(mime_type);
}
bool IsJSONMimeType(const std::string& mime_type) {
return g_mime_util.Get().IsJSONMimeType(mime_type);
}
bool IsSupportedMimeType(const std::string& mime_type) {
return g_mime_util.Get().IsSupportedMimeType(mime_type);
}
} // namespace blink
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