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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
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) renderPostHandler() http.Handler {
tpl := a.mustParseBasedTpl("post.html")
renderIndexHandler := a.renderPostsIndexHandler()
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
id := strings.TrimSuffix(filepath.Base(r.URL.Path), ".html")
if id == "/" {
renderIndexHandler.ServeHTTP(rw, r)
return
}
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)
tplPayload := 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 {
tplPayload.SeriesPrevious = &seriesPost
continue
}
tplPayload.SeriesNext = &seriesPost
break
}
}
executeTemplate(rw, r, tpl, tplPayload)
})
}
func (a *api) renderPostsIndexHandler() http.Handler {
tpl := a.mustParseBasedTpl("posts.html")
const pageCount = 20
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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
}
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)
})
}
|