Adding dep files and dependencies.

vendor/github.com/samuel/go-zookeeper/zk/util.go

@@ -0,0 +1,116 @@
+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 {
+	for i := range servers {
+		if !strings.Contains(servers[i], ":") {
+			servers[i] = servers[i] + ":" + strconv.Itoa(DefaultPort)
+		}
+	}
+	return servers
+}
+
+// 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
+}