appview: oauth/handler: implement logout

appview/oauth/handler/handler.go

···
 	"github.com/lestrrat-go/jwx/v2/jwk"
 	"tangled.sh/tangled.sh/core/appview"
 	"tangled.sh/tangled.sh/core/appview/db"
+	"tangled.sh/tangled.sh/core/appview/middleware"
 	"tangled.sh/tangled.sh/core/appview/oauth"
 	"tangled.sh/tangled.sh/core/appview/oauth/client"
 	"tangled.sh/tangled.sh/core/appview/pages"
···
 
 	r.Get("/login", o.login)
 	r.Post("/login", o.login)
+
+	r.With(middleware.AuthMiddleware(o.OAuth)).Post("/logout", o.logout)
 
 	r.Get("/oauth/client-metadata.json", o.clientMetadata)
 	r.Get("/oauth/jwks.json", o.jwks)
···
 		"token_endpoint_auth_method":      "private_key_jwt",
 		"token_endpoint_auth_signing_alg": "ES256",
 	}
-
-	fmt.Println("clientMetadata", metadata)
 
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusOK)
···
 
 	log.Println("session saved successfully")
 
+	http.Redirect(w, r, "/", http.StatusFound)
+}
+
+func (o *OAuthHandler) logout(w http.ResponseWriter, r *http.Request) {
+	err := o.OAuth.ClearSession(r, w)
+	if err != nil {
+		log.Println("failed to clear session:", err)
+		http.Redirect(w, r, "/", http.StatusFound)
+		return
+	}
+
+	log.Println("session cleared successfully")
 	http.Redirect(w, r, "/", http.StatusFound)
 }
 

appview/pages/templates/user/login.html

···
                 </h2>
                 <form
                     class="mt-4 max-w-sm mx-auto"
-                    hx-post="/oauth/login"
+                    hx-post="/login"
                     hx-swap="none"
-                    hx-disabled-elt="this"
+                    hx-disabled-elt="#login-button"
                 >
                     <div class="flex flex-col">
                         <label for="handle">handle</label>

kvothe.dolphin-pentatonic.ts.net.crt

···
+-----BEGIN CERTIFICATE-----
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+el3SirHpHiwyY8940+3NBbks2NO2Ty5QsSVKayWOTWQ6
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIEVzCCAj+gAwIBAgIRAIOPbGPOsTmMYgZigxXJ/d4wDQYJKoZIhvcNAQELBQAw
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+VQD9F6Na/+zmXCc=
+-----END CERTIFICATE-----

kvothe.dolphin-pentatonic.ts.net.key

···
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIMJO0WxtmpDeZ7747hBOX3VCxAjybvqlhRpQhyfmfoiaoAoGCCqGSM49
+AwEHoUQDQgAEAmfzlJtDI6zQPvUzwM8mxFWAJluFHtyq3KHmKSqfjDdwyX05q4/R
+jhoXWF7x3Vd9S+V8JGIBiMoNgCQ+XpgYXQ==
+-----END EC PRIVATE KEY-----