| // Copyright 2018 Google LLC | |
| // | |
| // Licensed under the Apache License, Version 2.0 (the "License"); | |
| // you may not use this file except in compliance with the License. | |
| // You may obtain a copy of the License at | |
| // | |
| // http://www.apache.org/licenses/LICENSE-2.0 | |
| // | |
| // Unless required by applicable law or agreed to in writing, software | |
| // distributed under the License is distributed on an "AS IS" BASIS, | |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| // See the License for the specific language governing permissions and | |
| // limitations under the License. | |
| package main | |
| import ( | |
| "fmt" | |
| "math/rand" | |
| ) | |
| // CreateTrackingId generates a tracking ID. | |
| func CreateTrackingId(salt string) string { | |
| return fmt.Sprintf("%c%c-%d%s-%d%s", | |
| getRandomLetterCode(), | |
| getRandomLetterCode(), | |
| len(salt), | |
| getRandomNumber(3), | |
| len(salt)/2, | |
| getRandomNumber(7), | |
| ) | |
| } | |
| // getRandomLetterCode generates a code point value for a capital letter. | |
| func getRandomLetterCode() uint32 { | |
| return 65 + uint32(rand.Intn(25)) | |
| } | |
| // getRandomNumber generates a string representation of a number with the requested number of digits. | |
| func getRandomNumber(digits int) string { | |
| str := "" | |
| for i := 0; i < digits; i++ { | |
| str = fmt.Sprintf("%s%d", str, rand.Intn(10)) | |
| } | |
| return str | |
| } | |