utils_exp.go

   1 //
   2 // Copyright © 2011-2017 Guy M. Allard
   3 //
   4 // Licensed under the Apache License, Version 2.0 (the "License");
   5 // you may not use this file except in compliance with the License.
   6 // You may obtain a copy of the License at
   7 //
   8 //     http://www.apache.org/licenses/LICENSE-2.0
   9 //
  10 // Unless required by applicable law or agreed to in writing, software
  11 // distributed under the License is distributed on an "AS IS" BASIS,
  12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 // See the License for the specific language governing permissions and
  14 // limitations under the License.
  15 //
  16
  17 package stompngo
  18
  19 import (
  20         "crypto/rand"
  21         "crypto/sha1"
  22         "encoding/hex"
  23         "fmt"
  24         "io"
  25         //
  26         "github.com/gmallard/stompngo/senv"
  27 )
  28
  29 /*
  30         HexData returns a dump formatted value of a byte slice.
  31 */
  32 func HexData(b []uint8) string {
  33         td := b[:]
  34         m := senv.MaxBodyLength()
  35         if m > 0 {
  36                 if m < len(td) {
  37                         td = td[:m]
  38                 }
  39         }
  40         return "\n" + hex.Dump(td)
  41 }
  42
  43 /*
  44         Sha1 returns a SHA1 hash for a specified string.
  45 */
  46 func Sha1(q string) string {
  47         g := sha1.New()
  48         g.Write([]byte(q))
  49         return fmt.Sprintf("%x", g.Sum(nil))
  50 }
  51
  52 /*
  53         Uuid returns a type 4 UUID.
  54 */
  55 func Uuid() string {
  56         b := make([]byte, 16)
  57         _, _ = io.ReadFull(rand.Reader, b)
  58         b[6] = (b[6] & 0x0F) | 0x40
  59         b[8] = (b[8] &^ 0x40) | 0x80
  60         return fmt.Sprintf("%x-%x-%x-%x-%x", b[:4], b[4:6], b[6:8], b[8:10], b[10:])
  61 }
  62
  63 /*
  64         Supported checks if a particular STOMP version is supported in the current
  65         implementation.
  66 */
  67 func Supported(v string) bool {
  68         return hasValue(supported, v)
  69 }
  70
  71 /*
  72         Protocols returns a slice of client supported protocol levels.
  73 */
  74 func Protocols() []string {
  75         return supported
  76 }