main: switch from 'flag' to 'github.com/urfave/cli'

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

go.mod

@@ -3,6 +3,8 @@ module git.batts.cloud/vbatts/too-soon
 go 1.22.5
 
 require (
-	github.com/sirupsen/logrus v1.9.3 // indirect
-	golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
+	github.com/sirupsen/logrus v1.9.3
+	github.com/urfave/cli/v3 v3.0.0-beta1
 )
+
+require golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect

main.go

@@ -1,27 +1,66 @@
 package main
 
 import (
+	"context"
 	"crypto/x509"
 	"encoding/pem"
-	"flag"
+	"net/mail"
 	"os"
 	"time"
 
 	log "github.com/sirupsen/logrus"
+	cli "github.com/urfave/cli/v3"
 )
 
 func main() {
-	var retCode int = 0
-	fDays := flag.Int("d", 20, "number of days to alert on")
-	fDebug := flag.Bool("D", false, "debug mode")
-
-	flag.Parse()
-
-	if *fDebug {
+	cmd := &cli.Command{
+		Name:    "too-soon",
+		Usage:   "check if something expires too soon",
+		Version: "0.1",
+		Authors: []any{
+			&mail.Address{Name: "Vincent Batts", Address: "vbatts@hashbangbash.com"},
+		},
+		DefaultCommand: "pem",
+		Flags: []cli.Flag{
+			&cli.IntFlag{
+				Name:  "days",
+				Value: 20,
+				Usage: "days within range to alert about",
+			},
+			&cli.BoolFlag{
+				Name:    "debug",
+				Aliases: []string{"D"},
+				Value:   false,
+				Usage:   "output debug verbose info",
+			},
+		},
+		Before: func(ctx context.Context, cmd *cli.Command) (context.Context, error) {
+			if cmd.Bool("debug") {
 				log.SetLevel(log.DebugLevel)
 			}
+			return ctx, nil
+		},
+		Commands: []*cli.Command{
+			&cli.Command{
+				Name:   "pem",
+				Action: fPEMCheck,
+			},
+		},
+	}
+
+	if err := cmd.Run(context.Background(), os.Args); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func fPEMCheck(ctx context.Context, cmd *cli.Command) error {
+	retCode := 0
+	for i := 0; i <= cmd.Args().Len(); i++ {
+		file := cmd.Args().Get(i)
+		if file == "" {
+			break
+		}
 
-	for _, file := range flag.Args() {
 		var certs []*x509.Certificate
 
 		buf, err := os.ReadFile(file)
@@ -54,20 +93,22 @@ func main() {
 				continue
 			}
 
-			hours := time.Duration(*fDays * -24)
+			hours := time.Duration(cmd.Int("days") * -24)
 			alertTime := cert.NotAfter.Add(hours * time.Hour)
 			today := time.Now()
 			if today.After(alertTime) {
-				log.Warnf("%q : TIME TO RENEW CERTIFICATE (expires in less than %d days)", file, *fDays)
+				log.Warnf("%q : TIME TO RENEW CERTIFICATE (expires in less than %d days)", file, cmd.Int("days"))
 				log.Infof("%q : %v", file, cert.NotAfter)
 				log.Infof("%q : %v", file, cert.DNSNames)
-				retCode += 1
+				retCode++
 			} else {
 				log.Debugf("%q : %v", file, cert.NotAfter)
 				log.Debugf("%q : %v", file, cert.DNSNames)
 			}
 		}
 	}
-
-	os.Exit(retCode)
+	if retCode != 0 {
+		return cli.Exit("certificates need to be renewed", retCode)
+	}
+	return nil
 }