Mercurial > gemma

annotate pkg/common/random.go @ 3678:8f58851927c0

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client: make layer factory only return new layer config for individual maps instead of each time it is invoked. The purpose of the factory was to support multiple maps with individual layers. But returning a new config each time it is invoked leads to bugs that rely on the layer's state. Now this factory reuses the same objects it created before, per map.
author Markus Kottlaender <markus@intevation.de>
date Mon, 17 Jun 2019 17:31:35 +0200
parents 01ce3ba9b0d0
children 8c5df0f3562e
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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
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14 package common
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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"
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22 "math/big"
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23 mrand "math/rand"
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24 "time"
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25 )
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26
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27 // GenerateRandomKey generates a cryptographically secure random key
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28 // of a given length.
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29 func GenerateRandomKey(length int) []byte {
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30 k := make([]byte, length)
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31 if _, err := io.ReadFull(rand.Reader, k); err != nil {
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32 return nil
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33 }
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34 return k
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35 }
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36
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37 // RandomString generates a cryptographically secure password
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38 // of a given length which consists of alpha numeric characters
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39 // and at least one 'special' one.
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40 func RandomString(n int) string {
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41
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42 const (
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43 special = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"
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44 alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
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45 "abcdefghijklmnopqrstuvwxyz" +
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46 "0123456789" +
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47 special
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48 )
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49
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50 max := big.NewInt(int64(len(alphabet)))
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51 out := make([]byte, n)
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52
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53 for i := 0; i < 1000; i++ {
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54 for i := range out {
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55 v, err := rand.Int(rand.Reader, max)
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56 if err != nil {
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57 log.Panicf("error: %v\n", err)
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58 }
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59 out[i] = alphabet[v.Int64()]
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60 }
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61 // Ensure at least one special char.
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62 if bytes.ContainsAny(out, special) {
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63 return string(out)
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64 }
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65 }
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66 log.Println("warn: Your random generator may be broken.")
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67 out[0] = special[0]
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68 return string(out)
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69 }
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70
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71 func Random(low, high float64) func() float64 {
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72 if low > high {
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73 low, high = high, low
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74 }
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75
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76 var seed int64
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77 if seedInt, err := rand.Int(rand.Reader, big.NewInt(math.MaxInt64)); err != nil {
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78 log.Printf("warn: Generating good random seed failed: %v\n", err)
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79 seed = time.Now().Unix()
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80 } else {
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81 seed = seedInt.Int64()
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82 }
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83 rnd := mrand.New(mrand.NewSource(seed))
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84 m := high - low
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85 return func() float64 { return rnd.Float64()*m + low }
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86 }