Add fmt.Stringer to auth.Provider

auth/provider.go

@@ -1,6 +1,7 @@
 package auth
 
 import (
+	"fmt"
 	"github.com/1f349/lavender/auth/process"
 )
 
@@ -11,4 +12,6 @@ type Provider interface {
 
 	// Name defines a string value for the provider.
 	Name() string
+
+	fmt.Stringer
 }

auth/providers/base.go

@@ -33,6 +33,8 @@ func (b *Base) AccessState() process.State { return process.StateUnauthorized }
 
 func (b *Base) Name() string { return "base" }
 
+func (b *Base) String() string { return "%Provider(base)" }
+
 func (b *Base) RenderTemplate(ctx authContext.TemplateContext) error {
 	type s struct {
 		LoginNameMemory bool

auth/providers/oauth.go

@@ -58,6 +58,8 @@ func (o OAuthLogin) AccessState() process.State { return process.StateUnauthoriz
 
 func (o OAuthLogin) Name() string { return "oauth" }
 
+func (o OAuthLogin) String() string { return "%Provider(oauth)" }
+
 func (o OAuthLogin) AttemptLogin(ctx authContext.FormContext) error {
 	rCtx := ctx.Context()
 

auth/providers/otp.go

@@ -32,6 +32,8 @@ func (o *OtpLogin) AccessState() process.State { return process.StateBasic }
 
 func (o *OtpLogin) Name() string { return "otp" }
 
+func (o *OtpLogin) String() string { return "%Provider(otp)" }
+
 func (o *OtpLogin) RenderTemplate(ctx authContext.TemplateContext) error {
 	user := ctx.User()
 	if user == nil || user.Subject == "" {

auth/providers/passkey.go

@@ -25,6 +25,8 @@ func (p *PasskeyLogin) AccessState() process.State { return process.StateUnautho
 
 func (p *PasskeyLogin) Name() string { return "passkey" }
 
+func (p *PasskeyLogin) String() string { return "%Provider(passkey)" }
+
 func (p *PasskeyLogin) RenderButtonTemplate(ctx authContext.TemplateContext) {
 	// provide something non-nil
 	ctx.Render(struct{}{})

auth/providers/password.go

@@ -29,6 +29,8 @@ func (p *PasswordLogin) AccessState() process.State { return process.StateBase }
 
 func (p *PasswordLogin) Name() string { return "password" }
 
+func (p *PasswordLogin) String() string { return "%Provider(password)" }
+
 func (p *PasswordLogin) RenderTemplate(ctx authContext.TemplateContext) error {
 	// TODO(melon): rewrite this
 	req := ctx.Request()