feat: add passkey creation functionality

pkg/common/passkeys/credentials_create.go

@@ -0,0 +1,59 @@
+package passkeys
+
+import (
+	"github.com/go-webauthn/webauthn/protocol"
+	"github.com/labstack/echo/v4"
+	"github.com/onsonr/sonr/crypto/mpc"
+	"github.com/onsonr/sonr/pkg/common"
+)
+
+func Create(c echo.Context, handle string, ks mpc.Keyset) protocol.PublicKeyCredentialCreationOptions {
+	origin := c.Request().Host
+	svcName := c.Request().Host
+	addr := ks.Address()
+	return buildRegisterOptions(addr, handle, ks, origin, svcName)
+}
+
+func buildRegisterOptions(addr string, handle string, ks mpc.Keyset, origin string, svcName string) protocol.PublicKeyCredentialCreationOptions {
+	return protocol.PublicKeyCredentialCreationOptions{
+		Attestation:            protocol.PreferDirectAttestation,
+		AttestationFormats:     defaultPrimaryAttestationFormats(),
+		AuthenticatorSelection: defaultAuthenticatorSelection(),
+		RelyingParty:           buildServiceEntity(origin, svcName),
+		Extensions:             buildExtensions(ks),
+		Parameters:             buildCredentialParameters(),
+		Timeout:                10000,
+		User:                   buildUserEntity(addr, handle),
+	}
+}
+
+func buildExtensions(ks mpc.Keyset) protocol.AuthenticationExtensions {
+	return protocol.AuthenticationExtensions{
+		"largeBlob": common.LargeBlob{
+			Support: "required",
+			Write:   ks.UserJSON(),
+		},
+		"payment": common.Payment{
+			IsPayment: true,
+		},
+	}
+}
+
+func buildServiceEntity(name string, host string) protocol.RelyingPartyEntity {
+	return protocol.RelyingPartyEntity{
+		CredentialEntity: protocol.CredentialEntity{
+			Name: name,
+		},
+		ID: host,
+	}
+}
+
+func buildUserEntity(userAddress string, userHandle string) protocol.UserEntity {
+	return protocol.UserEntity{
+		ID:          userAddress,
+		DisplayName: userHandle,
+		CredentialEntity: protocol.CredentialEntity{
+			Name: userAddress,
+		},
+	}
+}