💻 Html

The Html response takes a status code, a file path and data for the template language.

func Html(code int, file string, template interface{}) HttpResponse {

It will load the file, parse the template and write the result using the Bytes response.

E. g. you have this index.html file given:

Hello {{.user}}

then a possible response could look like this:

return Html(StatusOK, "./index.html", map[string]string{
    "user": "Username",
})

The template will be parsed accodingly and produce the result

Hello Username

func Html(code int, file string, template any) Response {
    content, err := parseTemplate(file, template)
    if err != nil {
        return Error(status.InternalServerError, fmt.Errorf("html: parseTemplate: %v", err))
    }
    return htmlResponse{code: code, data: []byte(*content)}
}

type htmlResponse struct {
    code int
    data []byte
}

func (h htmlResponse) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
    rw.WriteHeader(h.code)
    rw.Header().Set(header.ContentType, ContentTypeTextHtml)
    _, err := rw.Write(h.data)
    if err != nil {
        log.Printf("htmlResponse: ServeHttp write failed: %v", err)
    }
}

func parseTemplate(templateFileName string, data any) (*string, error) {
    t, err := template.ParseFiles(templateFileName)
    if err != nil {
        return nil, err
    }
    buf := new(bytes.Buffer)
    if err = t.Execute(buf, data); err != nil {
        return nil, err
    }
    body := buf.String()
    return &body, nil
}