main.go

package main

import (
	"io"
	"log"
	"os"

	"github.com/kubewarden/cel-policy/internal/settings"
	"github.com/kubewarden/cel-policy/internal/validate"
)

const expectedArgsCount = 2

func main() {
	// Since we use log.Fatal* functions to write to stderr and exit with a non-zero status code,
	// we need to disable the default log prefix that includes the date and time, as it would
	// be bubbled up to the message of the response returned to the caller.
	log.SetFlags(0)

	if len(os.Args) != expectedArgsCount {
		log.Fatalln("Wrong usage, expected either 'validate' or 'validate-settings'")
	}

	input, err := io.ReadAll(os.Stdin)
	if err != nil {
		log.Panicf("Cannot read input: %v", err)
	}

	var response []byte

	switch os.Args[1] {
	case "validate":
		response, err = validate.Validate(input)
	case "validate-settings":
		response, err = settings.ValidateSettings(input)
	default:
		log.Fatalf("wrong subcommand: '%s' - use either 'validate' or 'validate-settings'", os.Args[1])
	}

	if err != nil {
		log.Fatal(err)
	}

	_, err = os.Stdout.Write(response)
	if err != nil {
		log.Fatalf("Cannot write response: %v", err)
	}
}