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package page
import (
"bytes"
"errors"
"io/fs"
"net/http"
)
// Render5xx is automatically called if any render fails,
// additionally you can call it for your own uses. It will
// try to use the 5xx template but will fall back to a plain
// page if that fails.
func Render5xx(w http.ResponseWriter, r *http.Request,
vars map[string]interface{}, statusCode int) {
p := NewPage(TemplateDirectory + "/5xx")
buf := &bytes.Buffer{}
err := p.Render(buf)
if err != nil {
logErr(r, "while trying 5xx", err)
http.Error(w, "Internal server error", statusCode)
return
}
w.WriteHeader(statusCode)
_, _ = w.Write(buf.Bytes())
logReq(r, statusCode)
}
// Render4xx is mostly used to render a 404 page, pulls from 404 template.
// automatically called by Render if a page is missing.
func Render4xx(w http.ResponseWriter, r *http.Request,
vars map[string]interface{}, statusCode int) {
p := NewPage(TemplateDirectory + "/4xx")
buf := &bytes.Buffer{}
err := p.Render(buf)
if err != nil {
logErr(r, "while trying 404", err)
Render5xx(w, r, vars, http.StatusInternalServerError)
return
}
w.WriteHeader(statusCode)
_, err = w.Write(buf.Bytes())
if err != nil {
Render5xx(w, r, nil, http.StatusInternalServerError)
return
}
logReq(r, statusCode)
}
// Render is a lower level option, allowing you to specify local
// variables and the status code in which to return.
func Render(w http.ResponseWriter, r *http.Request,
path string, vars map[string]interface{}, statusCode int) {
// Sepcifically use the specified path for the page
p := NewPage(path)
if vars != nil {
p.Vars = vars
}
buf := &bytes.Buffer{}
err := p.Render(buf)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
Render4xx(w, r, vars, http.StatusNotFound)
return
}
logErr(r, "rendering encountered", err)
Render5xx(w, r, vars, http.StatusInternalServerError)
return
}
w.WriteHeader(statusCode)
_, err = w.Write(buf.Bytes())
if err != nil {
logErr(r, "while writing to buf", err)
Render5xx(w, r, nil, http.StatusInternalServerError)
return
}
logReq(r, statusCode)
}
// RenderWithVars allows you to specify a specific page and whether or not
// you wish to override vars. If left nil they will not be overridden.
// Also see RenderForPath if you don't need to override them.
func RenderWithVars(w http.ResponseWriter, r *http.Request,
path string, vars map[string]interface{}) {
Render(w, r, path, vars, http.StatusOK)
}
// RenderForPath takes the path to a page and finish up the rendering
// Allowing you to place logic on what page is rendered by your handlers.
func RenderForPath(w http.ResponseWriter, r *http.Request, path string) {
RenderWithVars(w, r, path, nil)
}
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