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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
package main
import (
"context"
"errors"
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
appbsky "github.com/bluesky-social/indigo/api/bsky"
"github.com/bluesky-social/indigo/atproto/syntax"
"github.com/labstack/echo/v4"
)
var ErrPostNotFound = errors.New("post not found")
var ErrPostNotPublic = errors.New("post is not publicly accessible")
func (srv *Server) getBlueskyPost(ctx context.Context, did syntax.DID, rkey syntax.RecordKey) (*appbsky.FeedDefs_PostView, error) {
// fetch the post post (with extra context)
uri := fmt.Sprintf("at://%s/app.bsky.feed.post/%s", did, rkey)
tpv, err := appbsky.FeedGetPostThread(ctx, srv.xrpcc, 1, 0, uri)
if err != nil {
log.Warnf("failed to fetch post: %s\t%v", uri, err)
// TODO: detect 404, specifically?
return nil, ErrPostNotFound
}
if tpv.Thread.FeedDefs_BlockedPost != nil {
return nil, ErrPostNotPublic
} else if tpv.Thread.FeedDefs_ThreadViewPost.Post == nil {
return nil, ErrPostNotFound
}
postView := tpv.Thread.FeedDefs_ThreadViewPost.Post
for _, label := range postView.Author.Labels {
if label.Src == postView.Author.Did && label.Val == "!no-unauthenticated" {
return nil, ErrPostNotPublic
}
}
return postView, nil
}
func (srv *Server) WebHome(c echo.Context) error {
return c.Render(http.StatusOK, "home.html", nil)
}
type OEmbedResponse struct {
Type string `json:"type"`
Version string `json:"version"`
AuthorName string `json:"author_name,omitempty"`
AuthorURL string `json:"author_url,omitempty"`
ProviderName string `json:"provider_url,omitempty"`
CacheAge int `json:"cache_age,omitempty"`
Width *int `json:"width"`
Height *int `json:"height"`
HTML string `json:"html,omitempty"`
}
func (srv *Server) parseBlueskyURL(ctx context.Context, raw string) (*syntax.ATURI, error) {
if raw == "" {
return nil, fmt.Errorf("empty url")
}
// first try simple AT-URI
uri, err := syntax.ParseATURI(raw)
if nil == err {
return &uri, nil
}
// then try bsky.app post URL
u, err := url.Parse(raw)
if err != nil {
return nil, err
}
if u.Hostname() != "bsky.app" {
return nil, fmt.Errorf("only bsky.app URLs currently supported")
}
pathParts := strings.Split(u.Path, "/") // NOTE: pathParts[0] will be empty string
if len(pathParts) != 5 || pathParts[1] != "profile" || pathParts[3] != "post" {
return nil, fmt.Errorf("only bsky.app post URLs currently supported")
}
atid, err := syntax.ParseAtIdentifier(pathParts[2])
if err != nil {
return nil, err
}
rkey, err := syntax.ParseRecordKey(pathParts[4])
if err != nil {
return nil, err
}
var did syntax.DID
if atid.IsHandle() {
ident, err := srv.dir.Lookup(ctx, *atid)
if err != nil {
return nil, err
}
did = ident.DID
} else {
did, err = atid.AsDID()
if err != nil {
return nil, err
}
}
// TODO: don't really need to re-parse here, if we had test coverage
aturi, err := syntax.ParseATURI(fmt.Sprintf("at://%s/app.bsky.feed.post/%s", did, rkey))
if err != nil {
return nil, err
} else {
return &aturi, nil
}
}
func (srv *Server) WebOEmbed(c echo.Context) error {
formatParam := c.QueryParam("format")
if formatParam != "" && formatParam != "json" {
return c.String(http.StatusNotImplemented, "Unsupported oEmbed format: "+formatParam)
}
// TODO: do we actually do something with width?
width := 550
maxWidthParam := c.QueryParam("maxwidth")
if maxWidthParam != "" {
maxWidthInt, err := strconv.Atoi(maxWidthParam)
if err != nil || maxWidthInt < 220 || maxWidthInt > 550 {
return c.String(http.StatusBadRequest, "Invalid maxwidth (expected integer between 220 and 550)")
}
width = maxWidthInt
}
// NOTE: maxheight ignored
aturi, err := srv.parseBlueskyURL(c.Request().Context(), c.QueryParam("url"))
if err != nil {
return c.String(http.StatusBadRequest, fmt.Sprintf("Expected 'url' to be bsky.app URL or AT-URI: %v", err))
}
if aturi.Collection() != syntax.NSID("app.bsky.feed.post") {
return c.String(http.StatusNotImplemented, "Only posts (app.bsky.feed.post records) can be embedded currently")
}
did, err := aturi.Authority().AsDID()
if err != nil {
return err
}
post, err := srv.getBlueskyPost(c.Request().Context(), did, aturi.RecordKey())
if err == ErrPostNotFound {
return c.String(http.StatusNotFound, fmt.Sprintf("%v", err))
} else if err == ErrPostNotPublic {
return c.String(http.StatusForbidden, fmt.Sprintf("%v", err))
} else if err != nil {
return c.String(http.StatusInternalServerError, fmt.Sprintf("%v", err))
}
html, err := srv.postEmbedHTML(post)
if err != nil {
return c.String(http.StatusInternalServerError, fmt.Sprintf("%v", err))
}
data := OEmbedResponse{
Type: "rich",
Version: "1.0",
AuthorName: "@" + post.Author.Handle,
AuthorURL: fmt.Sprintf("https://bsky.app/profile/%s", post.Author.Handle),
ProviderName: "Bluesky Social",
CacheAge: 86400,
Width: &width,
Height: nil,
HTML: html,
}
if post.Author.DisplayName != nil {
data.AuthorName = fmt.Sprintf("%s (@%s)", *post.Author.DisplayName, post.Author.Handle)
}
return c.JSON(http.StatusOK, data)
}
func (srv *Server) WebPostEmbed(c echo.Context) error {
// sanity check arguments. don't 4xx, just let app handle if not expected format
rkeyParam := c.Param("rkey")
rkey, err := syntax.ParseRecordKey(rkeyParam)
if err != nil {
return c.String(http.StatusBadRequest, fmt.Sprintf("Invalid RecordKey: %v", err))
}
didParam := c.Param("did")
did, err := syntax.ParseDID(didParam)
if err != nil {
return c.String(http.StatusBadRequest, fmt.Sprintf("Invalid DID: %v", err))
}
_ = rkey
_ = did
// NOTE: this request was't really necessary; the JS will do the same fetch
/*
postView, err := srv.getBlueskyPost(ctx, did, rkey)
if err == ErrPostNotFound {
return c.String(http.StatusNotFound, fmt.Sprintf("%v", err))
} else if err == ErrPostNotPublic {
return c.String(http.StatusForbidden, fmt.Sprintf("%v", err))
} else if err != nil {
return c.String(http.StatusInternalServerError, fmt.Sprintf("%v", err))
}
*/
return c.Render(http.StatusOK, "postEmbed.html", nil)
}
|
