validation.go
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validation.go
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	package config

	import (
	"fmt"
	"regexp"
	"strconv"
	)

	var (
	domainReg = regexp.MustCompile("^https?://")
	)

	const (
	minPort = 80
	maxPort = 1<<16 - 1
	)

	func validateDomain(i string) error {
	if !domainReg.MatchString(i) {
	return fmt.Errorf("Domain must start with http:// or https://")
	}
	return nil
	}

	func validatePort(i string) error {
	p, err := strconv.Atoi(i)
	if err != nil {
	return err
	}
	if p < minPort \|\| p > maxPort {
	return fmt.Errorf("Port must be a number %d - %d", minPort, maxPort)
	}
	return nil
	}

	func validateNonEmpty(i string) error {
	if i == "" {
	return fmt.Errorf("Must not be empty")
	}
	return nil
	}