Library for safe type conversion in Go

The type of int equals int64 on 64-bit machine in Go.
When you convert int(int64) to int32, int8 or int6, Your code could have Integer Overflow vulnerability.

In 2019, Kubernetes had the vulnerability. and the vulnerability was found on Security Audit Project by Trail of Bits.
You can use this library to prevent the vulnerability creation.

(This library is inspired by Kubernetes's Security Audit Report by Trail of Bits)

import "github.com/rung/go-safecast"

	i := 2147483647
	i32, err := safecast.Int32(i) // convert int to int32 in a safe way
	if err != nil {
		return err
	}

The function returns error when the value is out of the 32-bit range.
This library also has safecast.Int16 and safecast.Int8. You can use the functions in the same way as safecast.Int32

	s := "2147483647"
	i, err := safecast.Atoi32(s) // convert string to int32 in a safe way
	if err != nil {
		return err
	}

The function returns error when the value is out of the 32-bit range.
This library also has safecast.Atoi16 and safecast.Atoi8. You can use the functions in the same way as safecast.Atoi32

Native int32() type conversion doesn't return error when the code cause integer overflow.

Link: Go Playground

This library returns error when the value is out of the 32-bit range.
So you can convert integer in a safe way.

Link: Go Playground

MIT License