57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
// Copyright 2018 Google LLC
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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 main
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import (
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"fmt"
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"math/rand"
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"time"
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)
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// seeded determines if the random number generator is ready.
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var seeded bool = false
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// CreateTrackingId generates a tracking ID.
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func CreateTrackingId(salt string) string {
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if !seeded {
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rand.Seed(time.Now().UnixNano())
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seeded = true
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}
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return fmt.Sprintf("%c%c-%d%s-%d%s",
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getRandomLetterCode(),
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getRandomLetterCode(),
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len(salt),
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getRandomNumber(3),
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len(salt)/2,
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getRandomNumber(7),
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)
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}
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// getRandomLetterCode generates a code point value for a capital letter.
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func getRandomLetterCode() uint32 {
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return 65 + uint32(rand.Intn(25))
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}
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// getRandomNumber generates a string representation of a number with the requested number of digits.
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func getRandomNumber(digits int) string {
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str := ""
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for i := 0; i < digits; i++ {
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str = fmt.Sprintf("%s%d", str, rand.Intn(10))
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}
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return str
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}
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