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167 lines
3.5 KiB
167 lines
3.5 KiB
package http
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import (
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"embed"
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"fmt"
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"html/template"
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"io/fs"
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"net/http"
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"path/filepath"
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"strings"
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"time"
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"github.com/mediocregopher/blog.mediocregopher.com/srv/http/apiutil"
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)
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//go:embed tpl
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var tplFS embed.FS
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func mustReadTplFile(fileName string) string {
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path := filepath.Join("tpl", fileName)
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b, err := fs.ReadFile(tplFS, path)
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if err != nil {
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panic(fmt.Errorf("reading file %q from tplFS: %w", path, err))
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}
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return string(b)
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}
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func (a *api) blogURL(path string, abs bool) string {
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// filepath.Join strips trailing slash, but we want to keep it
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trailingSlash := strings.HasSuffix(path, "/")
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res := filepath.Join("/", path)
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if trailingSlash && res != "/" {
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res += "/"
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}
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if abs {
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res = a.params.PublicURL.String() + res
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}
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return res
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}
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func (a *api) postURL(id string, abs bool) string {
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path := filepath.Join("posts", id)
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return a.blogURL(path, abs)
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}
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func (a *api) postsURL(abs bool) string {
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return a.blogURL("posts", abs)
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}
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func (a *api) assetsURL(abs bool) string {
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return a.blogURL("assets", abs)
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}
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func (a *api) draftURL(id string, abs bool) string {
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path := filepath.Join("drafts", id)
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return a.blogURL(path, abs)
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}
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func (a *api) draftsURL(abs bool) string {
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return a.blogURL("drafts", abs)
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}
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func (a *api) tplFuncs() template.FuncMap {
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return template.FuncMap{
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"BlogURL": func(path string) string {
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return a.blogURL(path, false)
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},
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"StaticURL": func(path string) string {
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path = filepath.Join("static", path)
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return a.blogURL(path, false)
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},
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"StaticInlineCSS": func(path string) (template.CSS, error) {
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path = filepath.Join("static", path)
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b, err := staticFS.ReadFile(path)
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return template.CSS(b), err
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},
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"PostURL": func(id string) string {
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return a.postURL(id, false)
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},
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"AssetURL": func(id string) string {
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path := filepath.Join("assets", id)
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return a.blogURL(path, false)
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},
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"DraftURL": func(id string) string {
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return a.draftURL(id, false)
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},
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"DateTimeFormat": func(t time.Time) string {
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return t.Format("2006-01-02")
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},
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}
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}
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func (a *api) parseTpl(name, tplBody string) (*template.Template, error) {
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tpl := template.New(name)
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tpl = tpl.Funcs(a.tplFuncs())
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var err error
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if tpl, err = tpl.Parse(tplBody); err != nil {
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return nil, err
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}
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return tpl, nil
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}
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func (a *api) mustParseTpl(name string) *template.Template {
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return template.Must(a.parseTpl(name, mustReadTplFile(name)))
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}
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func (a *api) mustParseBasedTpl(name string) *template.Template {
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tpl := a.mustParseTpl(name)
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tpl = template.Must(tpl.New("base.html").Parse(mustReadTplFile("base.html")))
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return tpl
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}
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type tplData struct {
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Payload interface{}
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}
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// executeTemplate expects to be the final action in an http.Handler
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func executeTemplate(
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rw http.ResponseWriter, r *http.Request,
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tpl *template.Template, payload interface{},
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) {
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tplData := tplData{
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Payload: payload,
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}
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if err := tpl.Execute(rw, tplData); err != nil {
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apiutil.InternalServerError(
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rw, r, fmt.Errorf("rendering template: %w", err),
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)
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return
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}
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}
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func (a *api) executeRedirectTpl(
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rw http.ResponseWriter, r *http.Request, url string,
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) {
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executeTemplate(rw, r, a.redirectTpl, struct {
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URL string
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}{
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URL: url,
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})
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}
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func (a *api) renderDumbTplHandler(tplName string) http.Handler {
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tpl := a.mustParseBasedTpl(tplName)
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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if err := tpl.Execute(rw, nil); err != nil {
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apiutil.InternalServerError(
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rw, r, fmt.Errorf("rendering %q: %w", tplName, err),
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)
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return
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}
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})
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}
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