go-ean is a simple utility library for calculating EAN checksums and validating EAN-8, EAN-13 and UPC numbers.
go get github.com/nicholassm/go-ean/ean
To calculate a checksum use the ChecksumEan8, ChecksumEan13 or ChecksumUpc functions:
package main
import "github.com/nicholassm/go-ean/ean"
func main() {
c, err := ean.ChecksumUpc("012345678905")
println(c) // Prints 5
c, err := ean.ChecksumEan13("629104150021")
println(c) // Prints 3
c2, err2 := ean.ChecksumEan8("7351353")
println(c2) // Prints 7
}
To check the validity of a string as EAN-8, EAN-13 or UPC use Valid:
println(ean.Valid("96385074")) // Prints true
println(ean.Valid("abc")) // Prints false
(The MIT License)
Copyright (c) 2013 Nicholas Schultz-Møller
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.