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package http
import (
"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) blogURL(path string, abs bool) string {
// filepath.Join strips trailing slash, but we want to keep it
trailingSlash := strings.HasSuffix(path, "/")
res := filepath.Join("/", path)
if trailingSlash && res != "/" {
res += "/"
}
if abs {
res = a.params.PublicURL.String() + res
}
return res
}
func (a *api) postURL(id string, abs bool) string {
path := filepath.Join("posts", id)
return a.blogURL(path, abs)
}
func (a *api) editPostURL(id string, abs bool) string {
return a.postURL(id, abs) + "?method=edit"
}
func (a *api) managePostsURL(abs bool) string {
return a.blogURL("posts?method=manage", abs)
}
func (a *api) manageAssetsURL(abs bool) string {
return a.blogURL("assets?method=manage", abs)
}
func (a *api) draftPostURL(id string, abs bool) string {
path := filepath.Join("drafts", id)
return a.blogURL(path, abs)
}
func (a *api) editDraftPostURL(id string, abs bool) string {
return a.draftPostURL(id, abs) + "?method=edit"
}
func (a *api) manageDraftPostsURL(abs bool) string {
return a.blogURL("drafts", abs) + "?method=manage"
}
func (a *api) draftsURL(abs bool) string {
return a.blogURL("drafts", abs)
}
func (a *api) tplFuncs() template.FuncMap {
return template.FuncMap{
"BlogURL": func(path string) string {
return a.blogURL(path, false)
},
"StaticURL": func(path string) string {
path = filepath.Join("static", path)
return a.blogURL(path, false)
},
"StaticInlineCSS": func(path string) (template.CSS, error) {
path = filepath.Join("static", path)
b, err := staticFS.ReadFile(path)
return template.CSS(b), err
},
"PostURL": func(id string) string {
return a.postURL(id, false)
},
"AssetURL": func(id string) string {
path := filepath.Join("assets", id)
return a.blogURL(path, false)
},
"DraftURL": func(id string) string {
return a.draftPostURL(id, false)
},
"DateTimeFormat": func(t time.Time) string {
return t.Format("2006-01-02")
},
}
}
func (a *api) parseTpl(name, tplBody string) (*template.Template, error) {
tpl := template.New(name)
tpl = tpl.Funcs(a.tplFuncs())
var err error
if tpl, err = tpl.Parse(tplBody); err != nil {
return nil, err
}
return tpl, nil
}
func (a *api) mustParseTpl(name string) *template.Template {
return template.Must(a.parseTpl(name, 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{}
}
// executeTemplate expects to be the final action in an http.Handler
func executeTemplate(
rw http.ResponseWriter, r *http.Request,
tpl *template.Template, payload interface{},
) {
tplData := tplData{
Payload: payload,
}
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, url string,
) {
executeTemplate(rw, r, a.redirectTpl, struct {
URL string
}{
URL: url,
})
}
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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