mirror of
https://github.com/grafana/grafana.git
synced 2024-11-25 10:20:29 -06:00
57 lines
1.8 KiB
Go
57 lines
1.8 KiB
Go
// The MIT License
|
|
//
|
|
//Copyright (c) 2016 Tomas Aparicio
|
|
//
|
|
//Permission is hereby granted, free of charge, to any person
|
|
//obtaining a copy of this software and associated documentation
|
|
//files (the "Software"), to deal in the Software without
|
|
//restriction, including without limitation the rights to use,
|
|
//copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
//copies of the Software, and to permit persons to whom the
|
|
//Software is furnished to do so, subject to the following
|
|
//conditions:
|
|
//
|
|
//The above copyright notice and this permission notice shall be
|
|
//included in all copies or substantial portions of the Software.
|
|
//
|
|
//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
//EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
|
//OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
//NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
|
//HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|
//WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
//FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
//OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
package util
|
|
|
|
import (
|
|
"regexp"
|
|
"unicode/utf8"
|
|
)
|
|
|
|
var (
|
|
// nolint:gosimple
|
|
htmlCommentRegex = regexp.MustCompile("(?i)<!--([\\s\\S]*?)-->")
|
|
svgRegex = regexp.MustCompile(`(?i)^\s*(?:<\?xml[^>]*>\s*)?(?:<!doctype svg[^>]*>\s*)?<svg[^>]*>[^*]*<\/svg>\s*$`)
|
|
)
|
|
|
|
// isBinary checks if the given buffer is a binary file.
|
|
func isBinary(buf []byte) bool {
|
|
if len(buf) < 24 {
|
|
return false
|
|
}
|
|
for i := 0; i < 24; i++ {
|
|
charCode, _ := utf8.DecodeRuneInString(string(buf[i]))
|
|
if charCode == 65533 || charCode <= 8 {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Is returns true if the given buffer is a valid SVG image.
|
|
func IsSVG(buf []byte) bool {
|
|
return !isBinary(buf) && svgRegex.Match(htmlCommentRegex.ReplaceAll(buf, []byte{}))
|
|
}
|