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package http
import (
"fmt"
"net/http"
"path/filepath"
"regexp"
"strings"
"github.com/mediocregopher/blog.mediocregopher.com/srv/http/apiutil"
"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
)
func (a *api) renderIndexHandler() http.Handler {
legacyPostPathRegexp := regexp.MustCompile(
`^/[0-9]{4}/[0-9]{2}/[0-9]{2}/([^/.]+)\.html$`,
)
tpl := a.mustParseBasedTpl("index.html")
const pageCount = 10
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
path := r.URL.Path
if matches := legacyPostPathRegexp.FindStringSubmatch(path); len(matches) == 2 {
id := matches[1]
http.Redirect(rw, r, filepath.Join("/posts", id), http.StatusMovedPermanently)
return
}
if !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
}
tag := r.FormValue("tag")
var (
posts []post.StoredPost
hasMore bool
)
if tag == "" {
posts, hasMore, err = a.params.PostStore.Get(page, pageCount)
} else {
posts, err = a.params.PostStore.GetByTag(tag)
}
if err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("fetching page %d of posts: %w", page, err),
)
return
}
tags, err := a.params.PostStore.GetTags()
if err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("fething tags: %w", err),
)
return
}
tplPayload := struct {
Posts []post.StoredPost
PrevPage, NextPage int
Tags []string
}{
Posts: posts,
PrevPage: -1,
NextPage: -1,
Tags: tags,
}
if page > 0 {
tplPayload.PrevPage = page - 1
}
if hasMore {
tplPayload.NextPage = page + 1
}
executeTemplate(rw, r, tpl, tplPayload)
})
}
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