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annotate pkg/common/random.go @ 1017:a244b18cb916

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Added GNU Affero General Public License. Adjusted the headers of the Go files to be AGPLv3.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 23 Oct 2018 18:15:14 +0200
parents c1047fd04a3a
children 515815565bd0
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1017
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
408
ac23905e64b1 Improve WFS proxy a lot. It now generates signed re-writings.
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14 package common
339
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15
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16 import (
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17 "bytes"
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18 "crypto/rand"
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19 "io"
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20 "log"
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21 "math/big"
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22 )
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23
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24 func GenerateRandomKey(length int) []byte {
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25 k := make([]byte, length)
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26 if _, err := io.ReadFull(rand.Reader, k); err != nil {
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27 return nil
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28 }
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29 return k
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30 }
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31
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32 func RandomString(n int) string {
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33
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34 const (
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35 special = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"
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36 alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
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37 "abcdefghijklmnopqrstuvwxyz" +
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38 "0123456789" +
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39 special
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40 )
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41
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42 max := big.NewInt(int64(len(alphabet)))
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43 out := make([]byte, n)
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44
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45 for i := 0; i < 1000; i++ {
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46 for i := range out {
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47 v, err := rand.Int(rand.Reader, max)
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48 if err != nil {
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49 log.Panicf("error: %v\n", err)
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50 }
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51 out[i] = alphabet[v.Int64()]
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52 }
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53 // Ensure at least one special char.
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54 if bytes.IndexAny(out, special) >= 0 {
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55 return string(out)
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56 }
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57 }
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58 log.Println("warn: Your random generator may be broken.")
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59 out[0] = special[0]
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60 return string(out)
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61 }