mailcow-admin-aliases/internal/configuration/configuration.go

package configuration

import (
	"fmt"
	"log/slog"
	"os"

	"gopkg.in/yaml.v2"
)

const (
	AllDomainsApiEndpoint = "/api/v1/get/domain/all"
	AllAliasesApiEndpoint = "/api/v1/get/alias/all"
	AliasAddApiEndpoint   = "/api/v1/add/alias"
)

var (
	ConfigFile string
	DryRun     bool
	Quiet      bool
)

type Config struct {
	ApiEndpoint  string   `yaml:"api_endpoint"`
	ApiKey       string   `yaml:"api_key"`
	AdminEmail   string   `yaml:"admin_email"`
	MailPrefixes []string `yaml:"mail_prefixes"`
}

func (c *Config) LoadFromDisk() error {
	if ConfigFile == "" {
		slog.Debug("no config file found, looking in working dir")
		wd, err := os.Getwd()
		if err != nil {
			return fmt.Errorf("failed to get current working directory: %w", err)
		}
		ConfigFile = wd + "/config.yaml"
	}
	slog.Debug("looking for config file", "path", ConfigFile)

	data, err := os.ReadFile(ConfigFile)
	if err != nil {
		return fmt.Errorf("failed to read config file: %w", err)
	}

	err = yaml.Unmarshal(data, &c)
	if err != nil {
		return fmt.Errorf("failed to unmarshal config file: %w", err)
	}

	c.checkConfig()

	slog.Debug("successfully read config file", "path", ConfigFile)

	return nil

}

func (c Config) checkConfig() {
	failed := false
	if c.ApiEndpoint == "" {
		slog.Error("[CONFIG] api_endpoint must not be empty")
		failed = true
	}

	if c.ApiKey == "" {
		slog.Error("[CONFIG] api_key must not be empty")
		failed = true
	}

	if c.AdminEmail == "" {
		slog.Error("[CONFIG] admin_email must not be empty")
		failed = true
	}

	if len(c.MailPrefixes) < 1 {
		slog.Error("[CONFIG] mail_prefixes must have at least one entry")
		failed = true
	}

	if failed {
		slog.Error("[CONFIG] Application can't start until above errors are fixed.")
		os.Exit(1)
	}
}