Package sensitive

Package sensitive provides base types who's values should never be seen by the human eye, but still used for configuration.

What? Explain

Sometimes you have a variable, such as a password, passed into your program via arguments or ENV variables. Some of these variables are very sensitive! and should not in any circumstance be loggged or sent via JSON, despite JSON's "-", which people may forget. These variables, which are just typed primitive types, have their overridden fmt.Formatter, encoding.MarshalText & json.Marshal implementations.

As an added bonus using them as their base type eg. String => string, you have to explicitly cast the eg. string(s) This makes you think about what you're doing and why you casting it providing additional safelty.

Variables:

• String - The most useful
• Bool
• Float32
• Float64
• Int
• Int8
• Int16
• Int32
• Int64
• Uint
• Uint8
• Uint16
• Uint32
• Uint64

Example

// go run _examples/basic/main.go mypassword
package main

import (
	"encoding/json"
	"fmt"
	"os"

	"github.com/go-playground/sensitive"
)

func main() {
	password := sensitive.String(os.Args[1])

	fmt.Printf("%s\n", password)
	fmt.Printf("%v\n", password)

	b, _ := json.Marshal(password)
	fmt.Println(string(b))

	var empty *sensitive.String
	b, _ = json.Marshal(empty)
	fmt.Println(string(b))

	// output:
	//
	//
	// ""
	// null
}

Custom Formatting

package main

import (
	"encoding/json"
	"fmt"
	"io"
	"os"

	"github.com/go-playground/sensitive"
)

func init() {
	// override default Formatter
	sensitive.FormatStringFn = func(s sensitive.String, f fmt.State, c rune) {
		switch c {
		case 's':
			_, _ = io.WriteString(f, "redacted")
		case 'v':
			_, _ = io.WriteString(f, string(s)[:4]+"*******")
		}
	}
}

func main() {
	password := sensitive.String(os.Args[1])

	fmt.Printf("%s\n", password)
	fmt.Printf("%v\n", password)

	b, _ := json.Marshal(password)
	fmt.Println(string(b))

	var empty *sensitive.String
	b, _ = json.Marshal(empty)
	fmt.Println(string(b))

	// output:
	// redacted
	// mypa*******
	// "redacted"
	// null
}

License

Distributed under MIT License, please see license file in code for more details.