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package http
import (
"bytes"
"embed"
"fmt"
"html/template"
"io/fs"
"net/http"
"path/filepath"
"strings"
"time"
"github.com/mediocregopher/blog.mediocregopher.com/srv/http/apiutil"
)
//go:embed tpl
var tplFS embed.FS
func mustReadTplFile(fileName string) string {
path := filepath.Join("tpl", fileName)
b, err := fs.ReadFile(tplFS, path)
if err != nil {
panic(fmt.Errorf("reading file %q from tplFS: %w", path, err))
}
return string(b)
}
func (a *api) parseTpl(tplBody string) (*template.Template, error) {
blogURL := func(path string) string {
// filepath.Join strips trailing slash, but we want to keep it
trailingSlash := strings.HasSuffix(path, "/")
path = filepath.Join("/", path)
if trailingSlash && path != "/" {
path += "/"
}
return path
}
tpl := template.New("root")
tpl = tpl.Funcs(template.FuncMap{
"BlogURL": blogURL,
"StaticURL": func(path string) string {
path = filepath.Join("static", path)
return blogURL(path)
},
"AssetURL": func(id string) string {
path := filepath.Join("assets", id)
return blogURL(path)
},
"PostURL": func(id string) string {
path := filepath.Join("posts", id)
return blogURL(path)
},
"DateTimeFormat": func(t time.Time) string {
return t.Format("2006-01-02")
},
})
tpl = template.Must(tpl.New("image.html").Parse(mustReadTplFile("image.html")))
tpl = tpl.Funcs(template.FuncMap{
"Image": func(id string) (template.HTML, error) {
tplPayload := struct {
ID string
Resizable bool
}{
ID: id,
Resizable: isImgResizable(id),
}
buf := new(bytes.Buffer)
if err := tpl.ExecuteTemplate(buf, "image.html", tplPayload); err != nil {
return "", err
}
return template.HTML(buf.Bytes()), nil
},
})
var err error
if tpl, err = tpl.New("").Parse(tplBody); err != nil {
return nil, err
}
return tpl, nil
}
func (a *api) mustParseTpl(name string) *template.Template {
return template.Must(a.parseTpl(mustReadTplFile(name)))
}
func (a *api) mustParseBasedTpl(name string) *template.Template {
tpl := a.mustParseTpl(name)
tpl = template.Must(tpl.New("base.html").Parse(mustReadTplFile("base.html")))
return tpl
}
type tplData struct {
Payload interface{}
CSRFToken string
}
func (t tplData) CSRFFormInput() template.HTML {
return template.HTML(fmt.Sprintf(
`<input type="hidden" name="%s" value="%s" />`,
csrfTokenFormName, t.CSRFToken,
))
}
// executeTemplate expects to be the final action in an http.Handler
func executeTemplate(
rw http.ResponseWriter, r *http.Request,
tpl *template.Template, payload interface{},
) {
csrfToken, _ := apiutil.GetCookie(r, csrfTokenCookieName, "")
tplData := tplData{
Payload: payload,
CSRFToken: csrfToken,
}
if err := tpl.Execute(rw, tplData); err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("rendering template: %w", err),
)
return
}
}
func (a *api) executeRedirectTpl(
rw http.ResponseWriter, r *http.Request, path string,
) {
executeTemplate(rw, r, a.redirectTpl, struct {
Path string
}{
Path: path,
})
}
func (a *api) renderDumbTplHandler(tplName string) http.Handler {
tpl := a.mustParseBasedTpl(tplName)
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
if err := tpl.Execute(rw, nil); err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("rendering %q: %w", tplName, err),
)
return
}
})
}
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