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421 lines
9.1 KiB
421 lines
9.1 KiB
package http
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"html/template"
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"net/http"
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"path/filepath"
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"strings"
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txttpl "text/template"
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"time"
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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/http/apiutil"
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"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
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"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
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)
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func (a *api) parsePostBody(post post.Post) (*txttpl.Template, error) {
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tpl := txttpl.New("root")
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tpl = tpl.Funcs(txttpl.FuncMap(a.tplFuncs()))
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tpl = txttpl.Must(tpl.New("image.html").Parse(mustReadTplFile("image.html")))
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tpl = tpl.Funcs(txttpl.FuncMap{
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"Image": func(id string) (string, error) {
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tplPayload := struct {
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ID string
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Resizable bool
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}{
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ID: id,
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Resizable: isImgResizable(id),
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}
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buf := new(bytes.Buffer)
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if err := tpl.ExecuteTemplate(buf, "image.html", tplPayload); err != nil {
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return "", err
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}
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return buf.String(), nil
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},
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})
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tpl, err := tpl.New(post.ID + "-body.html").Parse(post.Body)
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if 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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type postTplPayload 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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func (a *api) postToPostTplPayload(storedPost post.StoredPost) (postTplPayload, error) {
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bodyTpl, err := a.parsePostBody(storedPost.Post)
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if err != nil {
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return postTplPayload{}, fmt.Errorf("parsing post body as template: %w", err)
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}
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bodyBuf := new(bytes.Buffer)
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if err := bodyTpl.Execute(bodyBuf, nil); err != nil {
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return postTplPayload{}, fmt.Errorf("executing post body as template: %w", err)
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}
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// this helps the markdown renderer properly parse pages which end in a
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// `</script>` tag... I don't know why.
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_, _ = bodyBuf.WriteString("\n")
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parserExt := parser.CommonExtensions | parser.AutoHeadingIDs
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parser := parser.NewWithExtensions(parserExt)
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htmlFlags := html.HrefTargetBlank
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htmlRenderer := html.NewRenderer(html.RendererOptions{Flags: htmlFlags})
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renderedBody := markdown.ToHTML(bodyBuf.Bytes(), parser, htmlRenderer)
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tplPayload := postTplPayload{
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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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return postTplPayload{}, fmt.Errorf(
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"fetching posts for series %q: %w", series, err,
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)
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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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tplPayload.SeriesNext = &seriesPost
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continue
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}
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tplPayload.SeriesPrevious = &seriesPost
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break
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}
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}
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return tplPayload, nil
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}
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func (a *api) renderPostHandler() http.Handler {
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tpl := a.mustParseBasedTpl("post.html")
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renderPostsIndexHandler := a.renderPostsIndexHandler()
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renderEditPostHandler := a.renderEditPostHandler(false)
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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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if id == "/" {
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renderPostsIndexHandler.ServeHTTP(rw, r)
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return
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}
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if _, ok := r.URL.Query()["edit"]; ok {
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renderEditPostHandler.ServeHTTP(rw, r)
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return
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}
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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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tplPayload, err := a.postToPostTplPayload(storedPost)
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if err != nil {
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apiutil.InternalServerError(
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rw, r, fmt.Errorf(
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"generating template payload for post with id %q: %w",
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id, err,
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),
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)
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return
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}
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executeTemplate(rw, r, tpl, tplPayload)
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})
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}
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func (a *api) renderPostsIndexHandler() http.Handler {
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renderEditPostHandler := a.renderEditPostHandler(false)
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tpl := a.mustParseBasedTpl("posts.html")
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const pageCount = 20
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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if _, ok := r.URL.Query()["edit"]; ok {
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renderEditPostHandler.ServeHTTP(rw, r)
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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.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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tplPayload := 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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tplPayload.PrevPage = page - 1
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}
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if hasMore {
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tplPayload.NextPage = page + 1
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}
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executeTemplate(rw, r, tpl, tplPayload)
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})
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}
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func (a *api) renderEditPostHandler(isDraft bool) http.Handler {
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tpl := a.mustParseBasedTpl("edit-post.html")
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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id := filepath.Base(r.URL.Path)
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var storedPost post.StoredPost
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if id != "/" {
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var err error
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if isDraft {
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storedPost.Post, err = a.params.PostDraftStore.GetByID(id)
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} else {
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storedPost, err = a.params.PostStore.GetByID(id)
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}
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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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} else if !isDraft {
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http.Error(rw, "Post ID required in URL", 400)
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return
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}
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tags, err := a.params.PostStore.GetTags()
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if err != nil {
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apiutil.InternalServerError(rw, r, fmt.Errorf("fetching tags: %w", err))
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return
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}
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tplPayload := struct {
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Post post.StoredPost
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Tags []string
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IsDraft bool
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}{
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Post: storedPost,
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Tags: tags,
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IsDraft: isDraft,
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}
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executeTemplate(rw, r, tpl, tplPayload)
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})
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}
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func postFromPostReq(r *http.Request) (post.Post, error) {
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p := post.Post{
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ID: r.PostFormValue("id"),
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Title: r.PostFormValue("title"),
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Description: r.PostFormValue("description"),
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Tags: strings.Fields(r.PostFormValue("tags")),
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Series: r.PostFormValue("series"),
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}
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// textareas encode newlines as CRLF for historical reasons
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p.Body = r.PostFormValue("body")
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p.Body = strings.ReplaceAll(p.Body, "\r\n", "\n")
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p.Body = strings.TrimSpace(p.Body)
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if p.ID == "" ||
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p.Title == "" ||
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p.Description == "" ||
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p.Body == "" ||
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len(p.Tags) == 0 {
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return post.Post{}, errors.New("ID, Title, Description, Tags, and Body are all required")
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}
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return p, nil
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}
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func (a *api) storeAndPublishPost(ctx context.Context, p post.Post) error {
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first, err := a.params.PostStore.Set(p, time.Now())
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if err != nil {
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return fmt.Errorf("storing post with id %q: %w", p.ID, err)
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}
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if !first {
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return nil
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}
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a.params.Logger.Info(ctx, "publishing blog post to mailing list")
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urlStr := a.postURL(p.ID, true)
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if err := a.params.MailingList.Publish(p.Title, urlStr); err != nil {
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return fmt.Errorf("publishing post to mailing list: %w", err)
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}
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if err := a.params.PostDraftStore.Delete(p.ID); err != nil {
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return fmt.Errorf("deleting draft: %w", err)
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}
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return nil
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}
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func (a *api) postPostHandler() http.Handler {
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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p, err := postFromPostReq(r)
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if err != nil {
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apiutil.BadRequest(rw, r, err)
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return
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}
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ctx = mctx.Annotate(ctx, "postID", p.ID)
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if err := a.storeAndPublishPost(ctx, p); err != nil {
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apiutil.InternalServerError(
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rw, r, fmt.Errorf("storing/publishing post with id %q: %w", p.ID, err),
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)
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return
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}
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a.executeRedirectTpl(rw, r, a.postURL(p.ID, false))
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})
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}
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func (a *api) deletePostHandler(isDraft bool) http.Handler {
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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id := filepath.Base(r.URL.Path)
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if id == "/" {
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apiutil.BadRequest(rw, r, errors.New("id is required"))
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return
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}
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var err error
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if isDraft {
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err = a.params.PostDraftStore.Delete(id)
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} else {
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err = a.params.PostStore.Delete(id)
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}
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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("deleting post with id %q: %w", id, err),
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)
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return
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}
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if isDraft {
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a.executeRedirectTpl(rw, r, a.draftsURL(false))
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} else {
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a.executeRedirectTpl(rw, r, a.postsURL(false))
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}
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})
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}
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func (a *api) previewPostHandler() http.Handler {
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tpl := a.mustParseBasedTpl("post.html")
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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p, err := postFromPostReq(r)
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if err != nil {
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apiutil.BadRequest(rw, r, err)
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return
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}
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storedPost := post.StoredPost{
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Post: p,
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PublishedAt: time.Now(),
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}
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tplPayload, err := a.postToPostTplPayload(storedPost)
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if err != nil {
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apiutil.InternalServerError(
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rw, r, fmt.Errorf("generating template payload: %w", err),
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)
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return
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}
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executeTemplate(rw, r, tpl, tplPayload)
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})
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}
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