woodpecker/shared/model/util.go
2014-10-22 00:13:47 -07:00

48 lines
1 KiB
Go

package model
import (
"crypto/md5"
"crypto/rand"
"fmt"
"io"
"strings"
)
// standard characters allowed in token string.
var chars = []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")
// default token length
var length = 40
// GenerateToken generates random strings good for use in URIs to
// identify unique objects.
func GenerateToken() string {
b := make([]byte, length)
r := make([]byte, length+(length/4)) // storage for random bytes.
clen := byte(len(chars))
maxrb := byte(256 - (256 % len(chars)))
i := 0
for {
io.ReadFull(rand.Reader, r)
for _, c := range r {
if c >= maxrb {
// Skip this number to avoid modulo bias.
continue
}
b[i] = chars[c%clen]
i++
if i == length {
return string(b)
}
}
}
}
// helper function to create a Gravatar Hash
// for the given Email address.
func CreateGravatar(email string) string {
email = strings.ToLower(strings.TrimSpace(email))
hash := md5.New()
hash.Write([]byte(email))
return fmt.Sprintf("%x", hash.Sum(nil))
}