Method executeTemplate

modules/caddyhttp/templates/templates.go:483–510

executeTemplate executes the template contained in wb.buf and replaces it with the results.

(rr caddyhttp.ResponseRecorder, r *http.Request)

// executeTemplate executes the template contained in wb.buf and replaces it with the results.
func (t *Templates) executeTemplate(rr caddyhttp.ResponseRecorder, r *http.Request) error {
	var fs http.FileSystem
	if t.FileRoot != "" {
		repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
		fs = http.Dir(repl.ReplaceAll(t.FileRoot, "."))
	}

	ctx := &TemplateContext{
		Root:        fs,
		Req:         r,
		RespHeader:  WrappedHeader{rr.Header()},
		config:      t,
		CustomFuncs: t.customFuncs,
	}

	err := ctx.executeTemplateInBuffer(r.URL.Path, rr.Buffer())
	if err != nil {
		// templates may return a custom HTTP error to be propagated to the client,
		// otherwise for any other error we assume the template is broken
		var handlerErr caddyhttp.HandlerError
		if errors.As(err, &handlerErr) {
			return handlerErr
		}
		return caddyhttp.Error(http.StatusInternalServerError, err)
	}

	return nil
}

// virtualResponseWriter is used in virtualized HTTP requests
// that templates may execute.