mirror of
https://github.com/grafana/grafana.git
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57 lines
1.8 KiB
Go
57 lines
1.8 KiB
Go
// The MIT License
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//
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//Copyright (c) 2016 Tomas Aparicio
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//
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//Permission is hereby granted, free of charge, to any person
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//obtaining a copy of this software and associated documentation
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//files (the "Software"), to deal in the Software without
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//restriction, including without limitation the rights to use,
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//copy, modify, merge, publish, distribute, sublicense, and/or sell
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//copies of the Software, and to permit persons to whom the
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//Software is furnished to do so, subject to the following
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//conditions:
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//
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//The above copyright notice and this permission notice shall be
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//included in all copies or substantial portions of the Software.
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//
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//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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//EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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//OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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//NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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//HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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//WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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//FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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//OTHER DEALINGS IN THE SOFTWARE.
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package util
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import (
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"regexp"
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"unicode/utf8"
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)
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var (
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// nolint:gosimple
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htmlCommentRegex = regexp.MustCompile("(?i)<!--([\\s\\S]*?)-->")
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svgRegex = regexp.MustCompile(`(?i)^\s*(?:<\?xml[^>]*>\s*)?(?:<!doctype svg[^>]*>\s*)?<svg[^>]*>[^*]*<\/svg>\s*$`)
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)
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// isBinary checks if the given buffer is a binary file.
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func isBinary(buf []byte) bool {
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if len(buf) < 24 {
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return false
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}
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for i := 0; i < 24; i++ {
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charCode, _ := utf8.DecodeRuneInString(string(buf[i]))
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if charCode == 65533 || charCode <= 8 {
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return true
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}
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}
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return false
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}
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// Is returns true if the given buffer is a valid SVG image.
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func IsSVG(buf []byte) bool {
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return !isBinary(buf) && svgRegex.Match(htmlCommentRegex.ReplaceAll(buf, []byte{}))
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}
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