Tim Wundenberg
6291700a3b
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67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
package middleware
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import (
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"context"
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"log/slog"
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"net/http"
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"spend-sparrow/internal/service"
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"spend-sparrow/internal/types"
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"spend-sparrow/internal/utils"
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"strings"
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)
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type csrfResponseWriter struct {
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http.ResponseWriter
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ctx context.Context
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auth service.Auth
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session *types.Session
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}
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func newCsrfResponseWriter(ctx context.Context, w http.ResponseWriter, auth service.Auth, session *types.Session) *csrfResponseWriter {
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return &csrfResponseWriter{
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ResponseWriter: w,
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ctx: ctx,
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auth: auth,
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session: session,
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}
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}
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func (rr *csrfResponseWriter) Write(data []byte) (int, error) {
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dataStr := string(data)
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csrfToken, err := rr.auth.GetCsrfToken(rr.ctx, rr.session)
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if err == nil {
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dataStr = strings.ReplaceAll(dataStr, "CSRF_TOKEN", csrfToken)
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}
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return rr.ResponseWriter.Write([]byte(dataStr))
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}
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func CrossSiteRequestForgery(auth service.Auth) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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session := GetSession(r)
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ctx := r.Context()
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if r.Method == http.MethodPost ||
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r.Method == http.MethodPut ||
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r.Method == http.MethodDelete ||
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r.Method == http.MethodPatch {
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csrfToken := r.Header.Get("Csrf-Token")
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if session == nil || csrfToken == "" || !auth.IsCsrfTokenValid(ctx, csrfToken, session.Id) {
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slog.Info("CSRF-Token not correct", "token", csrfToken)
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if r.Header.Get("Hx-Request") == "true" {
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utils.TriggerToastWithStatus(w, r, "error", "CSRF-Token not correct", http.StatusBadRequest)
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} else {
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http.Error(w, "CSRF-Token not correct", http.StatusBadRequest)
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}
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return
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}
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}
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responseWriter := newCsrfResponseWriter(ctx, w, auth, session)
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next.ServeHTTP(responseWriter, r)
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})
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}
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}
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