Mercurial > gemma
view misc/random.go @ 391:13c5fc6cbaea
docs: add map-data-flow.svg.
* Add diagram to show how our proxy, geoserver and the external
WFS and WMS servers will work together.
author | Bernhard Reiter <bernhard@intevation.de> |
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date | Mon, 13 Aug 2018 17:25:00 +0200 |
parents | 33b59c848771 |
children |
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package misc import ( "bytes" "crypto/rand" "io" "log" "math/big" ) func GenerateRandomKey(length int) []byte { k := make([]byte, length) if _, err := io.ReadFull(rand.Reader, k); err != nil { return nil } return k } func RandomString(n int) string { const ( special = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~" alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "abcdefghijklmnopqrstuvwxyz" + "0123456789" + special ) max := big.NewInt(int64(len(alphabet))) out := make([]byte, n) for i := 0; i < 1000; i++ { for i := range out { v, err := rand.Int(rand.Reader, max) if err != nil { log.Panicf("error: %v\n", err) } out[i] = alphabet[v.Int64()] } // Ensure at least one special char. if bytes.IndexAny(out, special) >= 0 { return string(out) } } log.Println("warn: Your random generator may be broken.") out[0] = special[0] return string(out) }