Add tool to get Matrix access token.

cmd/matrix-token/main.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/matrix-org/gomatrix"
+	"github.com/spf13/pflag"
+)
+
+var (
+	homeServer string
+	userID     string
+	password   string
+)
+
+func main() {
+	log.SetFlags(0)
+
+	pflag.StringVarP(&homeServer, "home-server", "s", "", "Matrix homeserver to login to.")
+	pflag.StringVarP(&userID, "user", "u", "", "UserID of user to login with.")
+	pflag.StringVarP(&password, "password", "p", "", "Password of user.")
+	pflag.Parse()
+
+	if homeServer == "" {
+		log.Println("Need server!")
+		pflag.Usage()
+		return
+	}
+
+	if userID == "" {
+		log.Println("Need user-ID!")
+		pflag.Usage()
+		return
+	}
+
+	if password == "" {
+		log.Println("Need password!")
+		pflag.Usage()
+		return
+	}
+
+	log.Printf("Getting a token for user %q on %q...", userID, homeServer)
+	cli, err := gomatrix.NewClient(homeServer, "", "")
+	if err != nil {
+		log.Fatalf("Error creating client: %s", err)
+	}
+
+	res, err := cli.Login(&gomatrix.ReqLogin{
+		Type:     "m.login.password",
+		User:     userID,
+		Password: password,
+	})
+
+	if err != nil {
+		log.Fatalf("Error during login: %s", err)
+	}
+
+	log.Println("Login successful.")
+	fmt.Println(res.AccessToken)
+}