mirror of
https://github.com/thegeeklab/drone-yaml.git
synced 2024-06-30 05:20:53 +02:00
51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
// Copyright 2019 Drone IO, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rand
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import (
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"crypto/rand"
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)
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var chars = []byte("abcdefghijklmnopqrstuvwxyz0123456789")
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// random string length
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const length = 32
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// String returns a string value.
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func String() string {
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clen := len(chars)
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maxrb := 255 - (256 % clen)
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b := make([]byte, length)
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r := make([]byte, length+(length/4)) // storage for random bytes.
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i := 0
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for {
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if _, err := rand.Read(r); err != nil {
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panic("rand: error reading random bytes")
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}
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for _, rb := range r {
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c := int(rb)
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if c > maxrb {
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// Skip this number to avoid modulo bias.
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continue
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}
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b[i] = chars[c%clen]
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i++
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if i == length {
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return string(b)
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}
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}
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}
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}
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