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package api
import (
"embed"
"errors"
"fmt"
"html/template"
"io/fs"
"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"
)
//go:embed tpl
var tplFS embed.FS
func (a *api) mustParseTpl(name string) *template.Template {
mustRead := func(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)
}
blogURL := func(path string) string {
return filepath.Join(a.params.PathPrefix, "/v2", path)
}
tpl := template.New("").Funcs(template.FuncMap{
"BlogURL": blogURL,
"AssetURL": func(path string) string {
path = filepath.Join("assets", path)
return blogURL(path)
},
})
tpl = template.Must(tpl.Parse(mustRead(name)))
tpl = template.Must(tpl.New("base.html").Parse(mustRead("base.html")))
return tpl
}
func (a *api) renderIndexHandler() http.Handler {
tpl := a.mustParseTpl("index.html")
const pageCount = 10
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
if path := r.URL.Path; !strings.HasSuffix(path, "/") && filepath.Base(path) != "index.html" {
http.Error(rw, "Page not found", 404)
return
}
page, err := apiutil.StrToInt(r.FormValue("p"), 0)
if err != nil {
apiutil.BadRequest(
rw, r, fmt.Errorf("invalid page number: %w", err),
)
return
}
posts, hasMore, err := a.params.PostStore.WithOrderDesc().Get(page, pageCount)
if err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("fetching page %d of posts: %w", page, err),
)
return
}
tplData := struct {
Posts []post.StoredPost
PrevPage, NextPage int
}{
Posts: posts,
PrevPage: -1,
NextPage: -1,
}
if page > 0 {
tplData.PrevPage = page - 1
}
if hasMore {
tplData.NextPage = page + 1
}
if err := tpl.Execute(rw, tplData); err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("rendering index: %w", err),
)
return
}
})
}
func (a *api) renderPostHandler() http.Handler {
tpl := a.mustParseTpl("post.html")
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 := tpl.Execute(rw, tplData); err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("rendering post with id %q: %w", id, err),
)
return
}
})
}
func (a *api) renderDumbHandler(tplName string) http.Handler {
tpl := a.mustParseTpl(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
}
})
}
func (a *api) renderPostAssetsIndexHandler() http.Handler {
tpl := a.mustParseTpl("admin-assets.html")
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
ids, err := a.params.PostAssetStore.List()
if err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("getting list of asset ids: %w", err),
)
return
}
tplData := struct {
IDs []string
}{
IDs: ids,
}
if err := tpl.Execute(rw, tplData); err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("rendering: %w", err),
)
return
}
})
}
|
