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package zk
import (
"crypto/sha1"
"encoding/base64"
"fmt"
"math/rand"
"strconv"
"strings"
"unicode/utf8"
)
// AuthACL produces an ACL list containing a single ACL which uses the
// provided permissions, with the scheme "auth", and ID "", which is used
// by ZooKeeper to represent any authenticated user.
func AuthACL(perms int32) []ACL {
return []ACL{{perms, "auth", ""}}
}
// WorldACL produces an ACL list containing a single ACL which uses the
// provided permissions, with the scheme "world", and ID "anyone", which
// is used by ZooKeeper to represent any user at all.
func WorldACL(perms int32) []ACL {
return []ACL{{perms, "world", "anyone"}}
}
func DigestACL(perms int32, user, password string) []ACL {
userPass := []byte(fmt.Sprintf("%s:%s", user, password))
h := sha1.New()
if n, err := h.Write(userPass); err != nil || n != len(userPass) {
panic("SHA1 failed")
}
digest := base64.StdEncoding.EncodeToString(h.Sum(nil))
return []ACL{{perms, "digest", fmt.Sprintf("%s:%s", user, digest)}}
}
// FormatServers takes a slice of addresses, and makes sure they are in a format
// that resembles <addr>:<port>. If the server has no port provided, the
// DefaultPort constant is added to the end.
func FormatServers(servers []string) []string {
srvs := make([]string, len(servers))
for i, addr := range servers {
if strings.Contains(addr, ":") {
srvs[i] = addr
} else {
srvs[i] = addr + ":" + strconv.Itoa(DefaultPort)
}
}
return srvs
}
// stringShuffle performs a Fisher-Yates shuffle on a slice of strings
func stringShuffle(s []string) {
for i := len(s) - 1; i > 0; i-- {
j := rand.Intn(i + 1)
s[i], s[j] = s[j], s[i]
}
}
// validatePath will make sure a path is valid before sending the request
func validatePath(path string, isSequential bool) error {
if path == "" {
return ErrInvalidPath
}
if path[0] != '/' {
return ErrInvalidPath
}
n := len(path)
if n == 1 {
// path is just the root
return nil
}
if !isSequential && path[n-1] == '/' {
return ErrInvalidPath
}
// Start at rune 1 since we already know that the first character is
// a '/'.
for i, w := 1, 0; i < n; i += w {
r, width := utf8.DecodeRuneInString(path[i:])
switch {
case r == '\u0000':
return ErrInvalidPath
case r == '/':
last, _ := utf8.DecodeLastRuneInString(path[:i])
if last == '/' {
return ErrInvalidPath
}
case r == '.':
last, lastWidth := utf8.DecodeLastRuneInString(path[:i])
// Check for double dot
if last == '.' {
last, _ = utf8.DecodeLastRuneInString(path[:i-lastWidth])
}
if last == '/' {
if i+1 == n {
return ErrInvalidPath
}
next, _ := utf8.DecodeRuneInString(path[i+w:])
if next == '/' {
return ErrInvalidPath
}
}
case r >= '\u0000' && r <= '\u001f',
r >= '\u007f' && r <= '\u009f',
r >= '\uf000' && r <= '\uf8ff',
r >= '\ufff0' && r < '\uffff':
return ErrInvalidPath
}
w = width
}
return nil
}
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