Add jwt sign cmd

cmd/web5/cmd_jwt.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/tbd54566975/web5-go/dids/did"
+	"github.com/tbd54566975/web5-go/jwt"
+)
+
+type jwtSignCMD struct {
+	Claims      string `arg:"" help:"The JWT Claims. Value is a JSON string."`
+	PortableDID string `arg:"" help:"The Portable DID to sign with. Value is a JSON string."`
+	Purpose     string `help:"Used to specify which key from the given DID Document should be used."`
+	Type        string `help:"Used to set the JWS Header 'typ' property"`
+}
+
+func (c *jwtSignCMD) Run() error {
+	var claims jwt.Claims
+	err := json.Unmarshal([]byte(c.Claims), &claims)
+	if err != nil {
+		return fmt.Errorf("%s: %w", "invalid credential", err)
+	}
+
+	var portableDID did.PortableDID
+	err = json.Unmarshal([]byte(c.PortableDID), &portableDID)
+	if err != nil {
+		return fmt.Errorf("%s: %w", "invalid portable DID", err)
+	}
+
+	bearerDID, err := did.FromPortableDID(portableDID)
+	if err != nil {
+		return err
+	}
+
+	opts := []jwt.SignOpt{}
+	if c.Purpose != "" {
+		opts = append(opts, jwt.Purpose(c.Purpose))
+	}
+	if c.Type != "" {
+		opts = append(opts, jwt.Type(c.Type))
+	}
+
+	signed, err := jwt.Sign(claims, bearerDID, opts...)
+	if err != nil {
+		return err
+	}
+
+	fmt.Println(signed)
+
+	return nil
+}

cmd/web5/main.go

@@ -11,6 +11,10 @@ import (
 //
 // [kong documentation]: https://github.com/alecthomas/kong
 type CLI struct {
+	JWT struct {
+		Sign jwtSignCMD `cmd:"" help:"Sign a JWT."`
+		// todo decode and verify
+	} `cmd:"" help:"Interface with JWT's."`
 	DID struct {
 		Resolve didResolveCMD `cmd:"" help:"Resolve a DID."`
 		Create  didCreateCMD  `cmd:"" help:"Create a DID."`