Mercurial > gemma

annotate pkg/common/random.go @ 5591:0011f50cf216 surveysperbottleneckid

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Removed no longer used alternative api for surveys/ endpoint. As bottlenecks in the summary for SR imports are now identified by their id and no longer by the (not guarantied to be unique!) name, there is no longer the need to request survey data by the name+date tuple (which isn't reliable anyway). So the workaround was now reversed.
author Sascha Wilde <wilde@sha-bang.de>
date Wed, 06 Apr 2022 13:30:29 +0200
parents 5f47eeea988d
children
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rev   line source
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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 "math"
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21 "math/big"
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22 mrand "math/rand"
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23 "time"
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24
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25 "gemma.intevation.de/gemma/pkg/log"
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26 )
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27
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28 // GenerateRandomKey generates a cryptographically secure random key
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29 // of a given length.
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30 func GenerateRandomKey(length int) []byte {
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31 k := make([]byte, length)
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32 if _, err := io.ReadFull(rand.Reader, k); err != nil {
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33 return nil
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34 }
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35 return k
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36 }
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37
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38 // RandomString generates a cryptographically secure password
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39 // of a given length which consists of alpha numeric characters
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40 // and at least one 'special' one.
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41 func RandomString(n int) string {
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42
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43 const (
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44 special = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"
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45 alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
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46 "abcdefghijklmnopqrstuvwxyz" +
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47 "0123456789" +
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48 special
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49 )
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50
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51 max := big.NewInt(int64(len(alphabet)))
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52 out := make([]byte, n)
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53
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54 for i := 0; i < 1000; i++ {
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55 for i := range out {
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56 v, err := rand.Int(rand.Reader, max)
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57 if err != nil {
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58 log.Panicf("%v\n", err)
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59 }
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60 out[i] = alphabet[v.Int64()]
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61 }
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62 // Ensure at least one special char.
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63 if bytes.ContainsAny(out, special) {
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64 return string(out)
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65 }
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66 }
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67 log.Warnf("Your random generator may be broken.")
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68 out[0] = special[0]
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69 return string(out)
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70 }
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71
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72 // Random returns a function which generates pseudo random
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73 // values in the range between low and high.
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74 func Random(low, high float64) func() float64 {
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75 if low > high {
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76 low, high = high, low
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77 }
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78
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79 var seed int64
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80 if seedInt, err := rand.Int(rand.Reader, big.NewInt(math.MaxInt64)); err != nil {
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81 log.Warnf("Generating good random seed failed: %v\n", err)
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82 seed = time.Now().Unix()
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83 } else {
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84 seed = seedInt.Int64()
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85 }
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86 rnd := mrand.New(mrand.NewSource(seed))
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87 m := high - low
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88 return func() float64 { return rnd.Float64()*m + low }
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89 }