1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
package http
import (
"fmt"
"net/http"
"path/filepath"
"strings"
"github.com/mediocregopher/blog.mediocregopher.com/srv/http/apiutil"
"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
)
func (a *api) renderIndexHandler() http.Handler {
tpl := a.mustParseBasedTpl("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.Get(page, pageCount)
if err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("fetching page %d of posts: %w", page, err),
)
return
}
tplPayload := struct {
Posts []post.StoredPost
PrevPage, NextPage int
}{
Posts: posts,
PrevPage: -1,
NextPage: -1,
}
if page > 0 {
tplPayload.PrevPage = page - 1
}
if hasMore {
tplPayload.NextPage = page + 1
}
executeTemplate(rw, r, tpl, tplPayload)
})
}
|
