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228 lines
4.8 KiB
228 lines
4.8 KiB
package api
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import (
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"embed"
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"errors"
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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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"github.com/gomarkdown/markdown"
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"github.com/gomarkdown/markdown/html"
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"github.com/gomarkdown/markdown/parser"
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"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
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"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
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)
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//go:embed tpl
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var tplFS embed.FS
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func (a *api) mustParseTpl(name string) *template.Template {
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mustRead := func(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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blogURL := func(path string) string {
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return filepath.Join(a.params.PathPrefix, "/v2", path)
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}
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tpl := template.New("").Funcs(template.FuncMap{
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"BlogURL": blogURL,
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"AssetURL": func(path string) string {
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path = filepath.Join("assets", path)
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return blogURL(path)
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},
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})
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tpl = template.Must(tpl.Parse(mustRead(name)))
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tpl = template.Must(tpl.New("base.html").Parse(mustRead("base.html")))
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return tpl
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}
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func (a *api) renderIndexHandler() http.Handler {
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tpl := a.mustParseTpl("index.html")
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const pageCount = 10
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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if path := r.URL.Path; !strings.HasSuffix(path, "/") && filepath.Base(path) != "index.html" {
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http.Error(rw, "Page not found", 404)
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return
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}
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page, err := apiutil.StrToInt(r.FormValue("p"), 0)
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if err != nil {
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apiutil.BadRequest(
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rw, r, fmt.Errorf("invalid page number: %w", err),
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)
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return
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}
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posts, hasMore, err := a.params.PostStore.WithOrderDesc().Get(page, pageCount)
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if err != nil {
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apiutil.InternalServerError(
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rw, r, fmt.Errorf("fetching page %d of posts: %w", page, err),
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)
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return
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}
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tplData := struct {
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Posts []post.StoredPost
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PrevPage, NextPage int
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}{
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Posts: posts,
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PrevPage: -1,
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NextPage: -1,
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}
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if page > 0 {
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tplData.PrevPage = page - 1
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}
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if hasMore {
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tplData.NextPage = page + 1
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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 index: %w", 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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func (a *api) renderPostHandler() http.Handler {
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tpl := a.mustParseTpl("post.html")
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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id := strings.TrimSuffix(filepath.Base(r.URL.Path), ".html")
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storedPost, err := a.params.PostStore.GetByID(id)
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if errors.Is(err, post.ErrPostNotFound) {
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http.Error(rw, "Post not found", 404)
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return
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} else if err != nil {
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apiutil.InternalServerError(
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rw, r, fmt.Errorf("fetching post with id %q: %w", id, err),
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)
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return
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}
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parserExt := parser.CommonExtensions | parser.AutoHeadingIDs
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parser := parser.NewWithExtensions(parserExt)
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htmlFlags := html.CommonFlags | html.HrefTargetBlank
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htmlRenderer := html.NewRenderer(html.RendererOptions{Flags: htmlFlags})
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renderedBody := markdown.ToHTML([]byte(storedPost.Body), parser, htmlRenderer)
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tplData := struct {
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post.StoredPost
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SeriesPrevious, SeriesNext *post.StoredPost
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Body template.HTML
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}{
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StoredPost: storedPost,
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Body: template.HTML(renderedBody),
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}
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if series := storedPost.Series; series != "" {
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seriesPosts, err := a.params.PostStore.GetBySeries(series)
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if err != nil {
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apiutil.InternalServerError(
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rw, r,
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fmt.Errorf("fetching posts for series %q: %w", series, err),
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)
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return
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}
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var foundThis bool
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for i := range seriesPosts {
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seriesPost := seriesPosts[i]
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if seriesPost.ID == storedPost.ID {
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foundThis = true
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continue
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}
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if !foundThis {
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tplData.SeriesPrevious = &seriesPost
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continue
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}
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tplData.SeriesNext = &seriesPost
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break
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}
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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 post with id %q: %w", id, 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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func (a *api) renderDumbHandler(tplName string) http.Handler {
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tpl := a.mustParseTpl(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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func (a *api) renderAdminAssets() http.Handler {
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tpl := a.mustParseTpl("admin/assets.html")
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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ids, err := a.params.PostAssetStore.List()
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if err != nil {
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apiutil.InternalServerError(
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rw, r, fmt.Errorf("getting list of asset ids: %w", err),
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)
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return
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}
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tplData := struct {
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IDs []string
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}{
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IDs: ids,
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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: %w", 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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