server: ActivityStreams reply/link/unlink API
s-ol
1 year, 1 month ago
| 22 | 22 | app.use(express.json()); |
| 23 | 23 | app.use(cookieParser()); |
| 24 | 24 | |
| 25 | type LinkOr<T> = string | T; | |
| 26 | ||
| 27 | type Person = { | |
| 28 | id: string; | |
| 29 | type: 'Person', | |
| 30 | name: string; | |
| 31 | }; | |
| 32 | ||
| 25 | 33 | type Note = { |
| 26 | 34 | type: 'Note'; |
| 27 | 35 | published: string; |
| 28 | attributedTo: string | { | |
| 29 | id: string; | |
| 30 | type: 'Person', | |
| 31 | name: string; | |
| 32 | }; | |
| 36 | attributedTo: LinkOr<Person>; | |
| 33 | 37 | inReplyTo: string[]; |
| 34 | 38 | replies: string[]; |
| 35 | 39 | content: string; |
| 40 | }; | |
| 41 | ||
| 42 | type Relationship<S, O> = { | |
| 43 | type: 'Relationship'; | |
| 44 | relationship: string; | |
| 45 | subject: S; | |
| 46 | object: O; | |
| 47 | }; | |
| 48 | ||
| 49 | type Create<O> = { | |
| 50 | type: 'Create'; | |
| 51 | actor: LinkOr<Person>; | |
| 52 | object: O; | |
| 53 | }; | |
| 54 | ||
| 55 | type Delete<O> = { | |
| 56 | type: 'Create'; | |
| 57 | actor: LinkOr<Person>; | |
| 58 | object: O; | |
| 59 | }; | |
| 60 | ||
| 61 | const iri2id = (iri: string) => { | |
| 62 | const parts = iri.split('/'); | |
| 63 | return parts[parts.length - 1]; | |
| 36 | 64 | }; |
| 37 | 65 | |
| 38 | 66 | const discdag = express() |
| 188 | 216 | { |
| 189 | 217 | items: { |
| 190 | 218 | '@id': 'as:items', |
| 191 | '@type': '@id', | |
| 192 | 219 | '@container': '@id' |
| 193 | 220 | }, |
| 194 | 221 | }, |
| 201 | 228 | }); |
| 202 | 229 | })) |
| 203 | 230 | |
| 204 | .put('/disc/:discussion', wrap(async ($req, $res) => { | |
| 205 | const { inReplyTo, content } = $req.body as { inReplyTo: string[], content: string }; | |
| 231 | .post('/disc/:discussion', wrap(async ($req, $res) => { | |
| 206 | 232 | const { discussion } = $req.params; |
| 207 | 233 | const { digest } = $req.cookies; |
| 208 | 234 | |
| 209 | 235 | if (!digest || !digest.length) |
| 210 | 236 | return $res.status(401).end(); |
| 211 | 237 | |
| 212 | if (!inReplyTo.length || !content.length) | |
| 213 | return $res.status(400).end(); | |
| 214 | ||
| 215 | const parents = inReplyTo.map(id => { | |
| 216 | const parts = id.split('/'); | |
| 217 | return parts[parts.length - 1]; | |
| 218 | }).join(','); | |
| 219 | ||
| 220 | const res = await fetch(DISCDAG_URL, { | |
| 221 | method: 'POST', | |
| 222 | headers: { | |
| 223 | 'Content-Type': 'application/x-www-form-urlencoded', | |
| 224 | 'Cookie': `DiscussionID=${discussion}; digest=${digest}; SelectedNodes=${parents}`, | |
| 225 | }, | |
| 226 | body: new URLSearchParams({ Action: 'SendReply', ReplyText: content }).toString(), | |
| 227 | }); | |
| 238 | type Activity = | |
| 239 | | Create<Note> | |
| 240 | | Create<Relationship<string, string>> | |
| 241 | | Delete<Relationship<string, string>> | |
| 242 | ; | |
| 243 | const activity = $req.body as Activity; | |
| 244 | ||
| 245 | let selection: string[]; | |
| 246 | let body: string; | |
| 247 | let method = 'GET'; | |
| 248 | if (activity.type === 'Create' && activity.object?.type === 'Note') { | |
| 249 | method = 'POST'; | |
| 250 | selection = activity.object.inReplyTo.map(iri2id); | |
| 251 | body = new URLSearchParams({ Action: 'SendReply', ReplyText: activity.object.content }).toString(); | |
| 252 | } else if (activity.object?.type === 'Relationship' && activity.object.relationship === 'as:inReplyTo') { | |
| 253 | const frm = iri2id(activity.object.object); | |
| 254 | const to = iri2id(activity.object.subject); | |
| 255 | selection = [frm, to]; | |
| 256 | body = new URLSearchParams({ | |
| 257 | Action: activity.type === 'Create' ? 'CreateLink' : 'RemoveLink', | |
| 258 | N0: frm, | |
| 259 | N1: to, | |
| 260 | }).toString(); | |
| 261 | } else { | |
| 262 | return $res.status(501).end(); | |
| 263 | } | |
| 264 | ||
| 265 | const headers = { | |
| 266 | 'Content-Type': 'application/x-www-form-urlencoded', | |
| 267 | 'Cookie': `DiscussionID=${discussion}; digest=${digest}; SelectedNodes=${selection.join(',')}`, | |
| 268 | }; | |
| 269 | ||
| 270 | let res; | |
| 271 | if (method === 'POST') { | |
| 272 | res = await fetch(DISCDAG_URL, { method, headers, body }); | |
| 273 | } else { | |
| 274 | res = await fetch(DISCDAG_URL + `?${body}`, { method, headers }); | |
| 275 | } | |
| 228 | 276 | |
| 229 | 277 | if (res.status !== 200) |
| 230 | 278 | throw new Error("bad response"); |
| 270 | 318 | items[to]?.inReplyTo.push(frm); |
| 271 | 319 | } |
| 272 | 320 | |
| 273 | return $res | |
| 274 | .json({ | |
| 275 | '@context': 'https://www.w3.org/ns/activitystreams', | |
| 276 | items, | |
| 277 | }); | |
| 321 | return $res.json({ | |
| 322 | '@context': [ | |
| 323 | 'https://www.w3.org/ns/activitystreams', | |
| 324 | { | |
| 325 | items: { | |
| 326 | '@id': 'as:items', | |
| 327 | '@container': '@id' | |
| 328 | }, | |
| 329 | }, | |
| 330 | ], | |
| 331 | items, | |
| 332 | }); | |
| 278 | 333 | })) |
| 279 | 334 | ; |
| 280 | 335 | |
| 317 | 372 | |
| 318 | 373 | try { |
| 319 | 374 | app.listen(PORT, (): void => { |
| 320 | console.log(`Connected successfully on port ${PORT}`); | |
| 375 | console.log(`Connected successfully on port ${PORT}`); | |
| 321 | 376 | }); |
| 322 | 377 | } catch (error) { |
| 323 | 378 | console.error(`Error occured: ${error}`); |