1 // 2 // Copyright 2023 The Sigstore Authors. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 16 package now 17 18 import ( 19 "fmt" 20 "os" 21 "strconv" 22 "time" 23 ) 24 25 // Now returns SOURCE_DATE_EPOCH or time.Now(). 26 func Now() (time.Time, error) { 27 // nolint 28 epoch := os.Getenv("SOURCE_DATE_EPOCH") 29 if epoch == "" { 30 return time.Now(), nil 31 } 32 33 seconds, err := strconv.ParseInt(epoch, 10, 64) 34 if err != nil { 35 return time.Now(), fmt.Errorf("SOURCE_DATE_EPOCH should be the number of seconds since January 1st 1970, 00:00 UTC, got: %w", err) 36 } 37 return time.Unix(seconds, 0), nil 38 } 39