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|
package api
import (
"errors"
"fmt"
"html/template"
"net/http"
"path/filepath"
"strings"
"github.com/gomarkdown/markdown"
"github.com/gomarkdown/markdown/html"
"github.com/gomarkdown/markdown/parser"
"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
)
func (a *api) postHandler() http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
id := strings.TrimSuffix(filepath.Base(r.URL.Path), ".html")
storedPost, err := a.params.PostStore.GetByID(id)
if errors.Is(err, post.ErrPostNotFound) {
http.Error(rw, "Post not found", 404)
return
} else if err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("fetching post with id %q: %w", id, err),
)
return
}
parserExt := parser.CommonExtensions | parser.AutoHeadingIDs
parser := parser.NewWithExtensions(parserExt)
htmlFlags := html.CommonFlags | html.HrefTargetBlank
htmlRenderer := html.NewRenderer(html.RendererOptions{Flags: htmlFlags})
renderedBody := markdown.ToHTML([]byte(storedPost.Body), parser, htmlRenderer)
tplData := struct {
post.StoredPost
SeriesPrevious, SeriesNext *post.StoredPost
Body template.HTML
}{
StoredPost: storedPost,
Body: template.HTML(renderedBody),
}
if series := storedPost.Series; series != "" {
seriesPosts, err := a.params.PostStore.GetBySeries(series)
if err != nil {
apiutil.InternalServerError(
rw, r,
fmt.Errorf("fetching posts for series %q: %w", series, err),
)
return
}
var foundThis bool
for i := range seriesPosts {
seriesPost := seriesPosts[i]
if seriesPost.ID == storedPost.ID {
foundThis = true
continue
}
if !foundThis {
tplData.SeriesPrevious = &seriesPost
continue
}
tplData.SeriesNext = &seriesPost
break
}
}
if err := tpls.ExecuteTemplate(rw, "post.html", tplData); err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("rendering post with id %q: %w", id, err),
)
return
}
})
}
|
