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faviconhash.go
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/
faviconhash.go
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package webfinger
import (
"bytes"
"encoding/base64"
"fmt"
"github.com/twmb/murmur3"
"regexp"
)
var (
shortcutText = regexp.MustCompile(`(?im)<link.*?rel=["']?shortcut icon["']?.*?>`)
shortcutHref = regexp.MustCompile(`(?im)href=['"]+(.*?)['"]+`)
)
func FindFaviconUrl(body string) string {
a := shortcutText.FindStringSubmatch(body)
if len(a) > 0 {
faviconLink := a[0]
b := shortcutHref.FindStringSubmatch(faviconLink)
if len(b) > 1 {
return b[1]
}
}
return ""
}
func mmh3Hash32(raw []byte) string {
var h32 = murmur3.New32()
_, err := h32.Write(raw)
if err == nil {
return fmt.Sprintf("%d", int32(h32.Sum32()))
} else {
return ""
}
}
func standBase64(braw []byte) []byte {
bckd := base64.StdEncoding.EncodeToString(braw)
var buffer bytes.Buffer
for i := 0; i < len(bckd); i++ {
ch := bckd[i]
buffer.WriteByte(ch)
if (i+1)%76 == 0 {
buffer.WriteByte('\n')
}
}
buffer.WriteByte('\n')
return buffer.Bytes()
}