Initial commit

internal/web/middleware.go

@@ -0,0 +1,114 @@
+package web
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"gardomatic.kleiax.de/lib/client"
+	"github.com/justinas/nosurf"
+)
+
+func secureHeaders(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Security-Policy", "default-src 'self'; style-src 'self'; style-src-attr 'unsafe-inline'; script-src 'self'; img-src 'self' data: blob:; media-src 'self' blob:; manifest-src 'self'; connect-src 'self'")
+		w.Header().Set("Permissions-Policy", "camera=(self), microphone=(self)")
+		w.Header().Set("Referrer-Policy", "strict-origin-when-cross-origin")
+		w.Header().Set("X-Content-Type-Options", "nosniff")
+		w.Header().Set("X-Frame-Options", "deny")
+		next.ServeHTTP(w, r)
+	})
+}
+
+func (app *application) logRequest(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		app.logger.Info("request", "remote_addr", r.RemoteAddr, "proto", r.Proto, "method", r.Method, "uri", r.URL.RequestURI())
+		next.ServeHTTP(w, r)
+	})
+}
+
+func (app *application) recoverPanic(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer func() {
+			if recovered := recover(); recovered != nil {
+				w.Header().Set("Connection", "close")
+				app.serverError(w, fmt.Errorf("panic: %v", recovered))
+			}
+		}()
+		next.ServeHTTP(w, r)
+	})
+}
+
+func (app *application) requireAuthentication(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if !app.isAuthenticated(r) {
+			http.Redirect(w, r, webPath("login"), http.StatusSeeOther)
+			return
+		}
+		w.Header().Set("Cache-Control", "no-store")
+		next.ServeHTTP(w, r)
+	})
+}
+
+func (app *application) requireActivatedUser(next http.Handler) http.Handler {
+	return app.requireAuthentication(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		user, ok := userFromContext(r.Context())
+		if !ok || !user.Activated {
+			http.Redirect(w, r, webPath("activate"), http.StatusSeeOther)
+			return
+		}
+		next.ServeHTTP(w, r)
+	}))
+}
+
+func (app *application) noSurf(next http.Handler) http.Handler {
+	csrfHandler := nosurf.New(next)
+	csrfHandler.SetIsTLSFunc(func(r *http.Request) bool {
+		return r.TLS != nil || app.config.CookieSecure
+	})
+	csrfHandler.SetBaseCookie(http.Cookie{
+		Name:     "gardomatic_csrf",
+		HttpOnly: true,
+		Path:     "/",
+		SameSite: http.SameSiteLaxMode,
+		Secure:   app.config.CookieSecure,
+	})
+	return csrfHandler
+}
+
+func (app *application) withAPIClient(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		requestClient, err := app.apiClient.ForRequest(r)
+		if err != nil {
+			app.serverError(w, err)
+			return
+		}
+		ctx := client.NewContext(r.Context(), requestClient)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func (app *application) authenticate(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		apiClient := client.FromContext(r.Context())
+		if apiClient == nil {
+			app.serverError(w, errors.New("API client missing from request context"))
+			return
+		}
+		user, response, err := apiClient.Session(r.Context())
+		if err != nil {
+			var apiError *client.APIError
+			if errors.As(err, &apiError) && apiError.StatusCode == http.StatusUnauthorized {
+				next.ServeHTTP(w, r)
+				return
+			}
+			app.serverError(w, err)
+			return
+		}
+		client.ForwardCookies(w, response)
+		ctx := context.WithValue(r.Context(), isAuthenticatedContextKey, true)
+		ctx = context.WithValue(ctx, userContextKey, user)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}