Files: 391163e63d7f2d8f4b5c8568fb7bfe8c355a54d0 / index.js
15253 bytesRaw
1 | var pull = require('pull-stream') |
2 | var Reduce = require('flumeview-reduce') |
3 | var I = require('./valid') |
4 | var deepEquals = require('deep-equals') |
5 | var types = require('./types') |
6 | var paramap = require('pull-paramap') |
7 | var ssbClient = require('ssb-client') |
8 | var crypto = require('crypto') |
9 | var ssbKeys = require('ssb-keys') |
10 | var u = require('./util') |
11 | var cap = require('./cap') |
12 | |
13 | function code(err, c) { |
14 | err.code = 'peer-invites:'+c |
15 | return err |
16 | } |
17 | |
18 | function all (stream, cb) { |
19 | return pull(stream, pull.collect(cb)) |
20 | } |
21 | |
22 | function isFunction (f) { |
23 | return typeof f === 'function' |
24 | } |
25 | |
26 | function isObject (o) { |
27 | return o && typeof o == 'object' |
28 | } |
29 | |
30 | function isString (s) { |
31 | return typeof s == 'string' |
32 | } |
33 | |
34 | function toBuffer(b) { |
35 | return Buffer.isBuffer(b) ? b : Buffer.from(b, 'base64') |
36 | } |
37 | |
38 | exports.name = 'peer-invites' |
39 | |
40 | exports.version = '1.0.0' |
41 | exports.manifest = { |
42 | getInvite: 'async', |
43 | confirm: 'async', |
44 | create: 'async', |
45 | willReplicate: 'async', |
46 | getNearbyPubs: 'async', |
47 | openInvite: 'async', |
48 | acceptInvite: 'async' |
49 | } |
50 | |
51 | exports.permissions = { |
52 | anonymous: {allow: ['willReplicate']}, |
53 | } |
54 | |
55 | // KNOWN BUG: it's possible to accept an invite more than once, |
56 | // but peers will ignore subsequent acceptances. it's possible |
57 | // that this could create confusion in certain situations. |
58 | // (but you'd get a feed that some peers thought was invited by Alice |
59 | // other peers would think a different feed accepted that invite) |
60 | // I guess the answer is to let alice reject the second invite?) |
61 | // that would be easier to do if this was a levelreduce? (keys: reduce, instead of a single reduce?) |
62 | |
63 | exports.init = function (sbot, config) { |
64 | var init = false |
65 | var layer = sbot.friends.createLayer('peer-invites') |
66 | |
67 | var caps = config.caps || {} |
68 | caps.peerInvite = caps.peerInvite || cap |
69 | var initial = {invites: {}, accepts: {}, hosts: {}, guests: {}} |
70 | |
71 | function reduce (acc, data, _seq) { |
72 | if(!acc) acc = initial |
73 | var msg = data.value |
74 | var invite, accept |
75 | if(types.isInvite(msg, caps)) { |
76 | //TODO: validate that this is a msg we understand! |
77 | invite = msg |
78 | accept = acc.accepts[data.key] |
79 | |
80 | //remember guest ids, so that you can process pub messages. |
81 | //this is necessary to confirm invites here the guest failed before they received |
82 | //the confirmation, and do not realize they are confirmed yet. they'll try again later. |
83 | |
84 | //id rather not have this here. it's gonna bloat. better a different kind of index. |
85 | //can fix this later though. |
86 | acc.guests[data.value.content.invite] = true |
87 | } |
88 | else if(types.isAccept(msg, caps)) { |
89 | accept = msg |
90 | invite = acc.invites[accept.content.receipt] |
91 | } |
92 | else if(types.isConfirm(msg, caps)) { |
93 | //TODO: just for when we are the guest, but we need to make sure at least one confirm exists. |
94 | accept = msg.content.embed |
95 | invite = acc.invites[accept.content.receipt] |
96 | } |
97 | |
98 | if(invite && accept) { |
99 | if(invite === true) |
100 | return acc |
101 | var invite_id = accept.content.receipt |
102 | try { I.verifyAccept(accept, invite, caps) } |
103 | catch (err) { return acc } |
104 | //fall through from not throwing |
105 | |
106 | //delete matched invites, but _only_ if they are VALID. (returned in the catch if invalid) |
107 | delete acc.accepts[invite_id] |
108 | //but remember that this invite has been processed. |
109 | acc.invites[invite_id] = true |
110 | acc.hosts[invite.author] = acc.hosts[invite.author] || {} |
111 | acc.hosts[invite.author][accept.author] = 1 |
112 | if(init) { |
113 | //interpret accepting an invite as a mutual follow. |
114 | layer(invite.author, accept.author, 1) |
115 | layer(accept.author, invite.author, 1) |
116 | } |
117 | } |
118 | else if(invite) |
119 | acc.invites[data.key] = invite |
120 | else if(accept) |
121 | acc.accepts[accept.receipt] = accept |
122 | |
123 | return acc |
124 | } |
125 | |
126 | var state |
127 | //a hack here, so that we can grab a handle on invites.value.set |
128 | var invites = sbot._flumeUse('peer-invites', function (log, name) { |
129 | var _invites = Reduce(3, reduce, null, null, initial)(log, name) |
130 | state = _invites.value |
131 | return _invites |
132 | }) |
133 | |
134 | invites.get(function (_, invites) { |
135 | var g = {} |
136 | if(!invites) layer({}) |
137 | else { |
138 | //interpret accepted invites as two-way, but only store a minimal host->guest data structure |
139 | for(var j in invites.hosts) |
140 | for(var k in invites.hosts[j]) |
141 | g[j][k] = g[k][j] = 1 |
142 | init = true |
143 | layer(g) |
144 | } |
145 | }) |
146 | |
147 | sbot.auth.hook(function (fn, args) { |
148 | var id = args[0], cb = args[1] |
149 | //currently a problem here where message may be confirmed, |
150 | //but guest didn't get the welcome yet. they need to be able to connect |
151 | //and request it again. |
152 | invites.get(function (err, v) { |
153 | if(err) return cb(err) |
154 | if(v.guests[id]) |
155 | return cb(null, { |
156 | allow: ['peerInvites.getInvite', 'peerInvites.confirm'], |
157 | deny: null |
158 | }) |
159 | fn.apply(null, args) |
160 | }) |
161 | }) |
162 | |
163 | //retrive full invitation. |
164 | invites.getInvite = function (invite_id, cb) { |
165 | var self = this |
166 | invites.get(function (err, v) { |
167 | var invite = v.invites[invite_id] |
168 | if(err) return cb(err) |
169 | if(!invite) |
170 | cb(code( |
171 | new Error('unknown invite:'+invite_id), |
172 | 'unknown-invite' |
173 | )) |
174 | else if(invite === true) |
175 | //TODO just retrive all confirmations we know about |
176 | //via links. |
177 | sbot.get(invite_id, cb) |
178 | //only allow the guest to request their own invite. |
179 | else if(self.id !== invite.content.invite) |
180 | cb(code( |
181 | new Error('invite did not match client id'), |
182 | 'invite-mismatch' |
183 | )) |
184 | else |
185 | cb(null, v.invites[invite_id]) |
186 | }) |
187 | } |
188 | |
189 | function getResponse (invite_id, test, cb) { |
190 | return all( |
191 | sbot.links({dest: invite_id, values: true, keys: false, meta: false}), |
192 | function (err, confirms) { |
193 | if(err) cb(err) |
194 | else cb(null, |
195 | confirms.filter(function (e) { |
196 | try { |
197 | return test(e) |
198 | } catch (err) { |
199 | return false |
200 | } |
201 | })[0] |
202 | ) |
203 | } |
204 | ) |
205 | } |
206 | |
207 | var accepted = {} |
208 | |
209 | function getConfirm (invite_id, accept, cb) { |
210 | getResponse(invite_id, function (msg) { |
211 | return ( |
212 | msg.content.type === 'peer-invite/confirm' && |
213 | msg.content.embed.content.receipt === invite_id && |
214 | deepEquals(msg.content.embed, accept) |
215 | ) |
216 | }, cb) |
217 | } |
218 | |
219 | //used to request that a server confirms your acceptance. |
220 | invites.confirm = function (accept, cb) { |
221 | var invite_id = accept.content.receipt |
222 | //check if the invite in question hasn't already been accepted. |
223 | getConfirm(invite_id, accept, function (err, confirm) { |
224 | if(err) return cb(err) |
225 | if(confirm) return cb(null, confirm) |
226 | |
227 | sbot.get(invite_id, function (err, invite) { |
228 | try { |
229 | I.verifyAccept(accept, invite, caps) |
230 | } catch (err) { |
231 | return cb(err) |
232 | } |
233 | //there is a little race condition here, if accept is called again |
234 | //before this write completes, it will write twice, so just return an error. |
235 | if(accepted[invite_id]) return cb(new Error('race condition: try again soon')) |
236 | |
237 | accepted[invite_id] = true |
238 | sbot.publish(I.createConfirm(accept), function (err, data) { |
239 | delete accepted[invite_id] |
240 | cb(err, data.value) |
241 | }) |
242 | }) |
243 | }) |
244 | } |
245 | |
246 | |
247 | //if the caller is someone we know, let them know wether |
248 | //we are willing to confirm (and replicate) their guest. |
249 | invites.willReplicate = function (opts, cb) { |
250 | if(isFunction(opts)) cb = opts, opts = {} |
251 | var id = this.id //id of caller |
252 | var max = config.friends && config.friends.hops || config.replicate && config.replicate.hops || 3 |
253 | sbot.friends.hops({}, function (err, hops) { |
254 | // compare hops of caller (host to be) with max - 1 |
255 | // because that means that the hops of the guest |
256 | // will be in range. |
257 | if(hops[id] <= (max - 1)) cb(null, true) |
258 | else cb(null, false) |
259 | }) |
260 | } |
261 | |
262 | function getAccept (invite_id, cb) { |
263 | getResponse(invite_id, function (msg) { |
264 | return ( |
265 | msg.content.type === 'peer-invite/accept' && |
266 | msg.content.receipt === invite_id |
267 | ) |
268 | }, cb) |
269 | } |
270 | |
271 | //retrive pubs who might be willing to confirm your invite. (used when creating an invte) |
272 | invites.getNearbyPubs = function (opts, cb) { |
273 | if(isFunction (opts)) |
274 | cb = opts, opts = {} |
275 | var maxHops = opts.hops || 2 |
276 | sbot.deviceAddress.getState(function (err, state) { |
277 | if(err) return cb(explain(err, 'could not retrive any device addresses')) |
278 | sbot.friends.hops({hops: opts.hops, reverse: true, start: opts.id}, function (err, hops) { |
279 | if(err) return cb(explain(err, 'could not retrive nearby friends')) |
280 | var near = [] |
281 | for(var k in state) { |
282 | var da = state[k] |
283 | if(hops[k] <= maxHops) { |
284 | near.push({ |
285 | id: k, |
286 | address: da.address, |
287 | hops: hops[k], |
288 | availability: da.availability |
289 | }) |
290 | } |
291 | } |
292 | //sort by reverse hops, then by decending availability. |
293 | //default availibility |
294 | near.sort(function (a, b) { |
295 | return ( |
296 | a.hops - b.hops || |
297 | b.availability - a.availability |
298 | ) |
299 | }) |
300 | |
301 | if(opts.offline) return cb(null, near) |
302 | |
303 | var count = 3, found = [] |
304 | |
305 | function pushFound (pub, err, will) { |
306 | found.push({ |
307 | id: pub.id, address: pub.address, |
308 | availability: pub.availability, |
309 | hops: pub.hops, |
310 | error: err && err.message, willReplicate: !!will |
311 | }) |
312 | if(will) count -- |
313 | //sort in order of wether they will replicate, |
314 | //or availability |
315 | found.sort(function (a, b) { |
316 | (!!b.willReplicate) - (!!a.willReplicate) || b.availability - a.availability |
317 | }) |
318 | } |
319 | |
320 | pull( |
321 | pull.values(near), |
322 | paramap(function (pub, cb) { |
323 | //if opts.id != sbot.id connect using ssb client |
324 | //so that you ask willReplicate from the correct id. |
325 | sbot.connect(pub.address, function (err, rpc) { |
326 | //skip pubs that were not contactable |
327 | if(err) { |
328 | pushFound(pub, err) |
329 | return cb() |
330 | } |
331 | rpc.peerInvites.willReplicate({}, function (err, v) { |
332 | //pass through input if true, else (err or false) |
333 | //then drop. |
334 | pushFound(pub, err, !!v) |
335 | cb(null, v && pub) |
336 | }) |
337 | }) |
338 | },3), |
339 | function (read) { |
340 | read(null, function next (err, pub) { |
341 | if(err) return cb(null, found) |
342 | else if(count) read(null, next) |
343 | else read(true, function (_) { cb(null, found) }) |
344 | }) |
345 | } |
346 | ) |
347 | }) |
348 | }) |
349 | } |
350 | |
351 | invites.create = function (opts, cb) { |
352 | if(isFunction(opts)) |
353 | return opts(new Error ('peer-invites: expected: options *must* be provided.')) |
354 | |
355 | var host_id = opts.id || sbot.id |
356 | invites.getNearbyPubs(opts, function (err, near) { |
357 | if(near.length == 0 && !opts.allowWithoutPubs) |
358 | return cb(new Error('failed to find any suitable pubs')) |
359 | |
360 | var seed = crypto.randomBytes(32).toString('base64') |
361 | sbot.identities.publishAs({ |
362 | id: host_id, |
363 | content: I.createInvite(seed, host_id, opts.reveal, opts.private, caps) |
364 | }, function (err, data) { |
365 | if(err) return cb(err) |
366 | var invite = { |
367 | seed: seed, |
368 | invite: data.key, |
369 | cap: opts.cap, |
370 | pubs: near.map(function (e) { return e.address }), |
371 | } |
372 | cb(null, u.stringify(invite)) |
373 | }) |
374 | }) |
375 | } |
376 | |
377 | //try each of an array of addresses, and cb the first one that works. |
378 | function connectFirst (invite, cb) { |
379 | var n = 0, err |
380 | var keys = ssbKeys.generate(null, toBuffer(invite.seed)) |
381 | invite.pubs.forEach(function (addr) { |
382 | n++ |
383 | //don't use sbot.connect here, because we are connecting |
384 | //with a different cap. |
385 | ssbClient(keys, { |
386 | remote: addr, |
387 | caps: {shs: invite.cap || caps.shs}, |
388 | manifest: { |
389 | peerInvites: { |
390 | getInvite: 'async', |
391 | confirm: 'async' |
392 | } |
393 | } |
394 | }, function (_err, rpc) { |
395 | if(n > 0 && rpc) { |
396 | n = -1 |
397 | cb(null, rpc) |
398 | } else { |
399 | err = err || _err |
400 | } |
401 | if(--n == 0) cb(err) |
402 | }) |
403 | }) |
404 | } |
405 | |
406 | //TODO: check if invite is already held locally |
407 | // if so, just get it. when got, update local db. |
408 | invites.openInvite = function (invite, cb) { |
409 | if(isString(invite)) invite = u.parse(invite) |
410 | invites.getInvite(invite.invite, function (err, msg) { |
411 | if(msg) |
412 | next(msg) |
413 | else |
414 | connectFirst(invite, function (err, rpc) { |
415 | if(err) return cb(err) |
416 | rpc.peerInvites.getInvite(invite.invite, function (err, msg) { |
417 | if(err) return cb(err) |
418 | next(msg) |
419 | }) |
420 | }) |
421 | |
422 | function next (msg) { |
423 | var invite_id = '%'+ssbKeys.hash(JSON.stringify(msg, null, 2)) |
424 | if(invite.invite !== invite_id) |
425 | return cb(new Error( |
426 | 'incorrect invite was returned! expected:'+invite.invite+', but got:'+inviteId |
427 | )) |
428 | var opened |
429 | try { opened = I.verifyInvitePrivate(msg, invite.seed, caps) } |
430 | catch (err) { return cb(err) } |
431 | //UPDATE REDUCE STATE. |
432 | // this is a wee bit naughty, because if you rebuild the index it might not have this invite |
433 | // (until you replicate it, but when you do the value won't change) |
434 | state.set(reduce(state.value, {key: invite_id, value:msg}, invites.since.value)) |
435 | cb(null, msg, opened) |
436 | } |
437 | }) |
438 | } |
439 | |
440 | invites.acceptInvite = function (opts, cb) { |
441 | if(isString(opts)) opts = u.parse(opts) |
442 | var invite = isObject(opts.invite) ? opts.invite : opts |
443 | var invite_id = invite.invite |
444 | var id = opts.id || sbot.id |
445 | |
446 | //check wether this invite is already accepted. |
447 | //or if the acceptance has been publish, but not yet confirmed. |
448 | getAccept(invite_id, function (err, accept) { |
449 | if(accept) next(accept) |
450 | else { |
451 | invites.openInvite(invite, function (err, invite_msg, opened) { |
452 | sbot.identities.publishAs({ |
453 | id: id, |
454 | content: I.createAccept(invite_msg, invite.seed, id, caps) |
455 | }, function (err, accept) { |
456 | if(err) cb(err) |
457 | else { |
458 | state.set(reduce(state.value, accept, invites.since.value)) |
459 | next(accept.value) |
460 | } |
461 | }) |
462 | }) |
463 | } |
464 | }) |
465 | |
466 | function next(accept) { |
467 | getConfirm(invite_id, accept, function (err, confirm) { |
468 | if(!confirm) |
469 | connectFirst(invite, function (err, rpc) { |
470 | if(err) return cb(err) |
471 | rpc.peerInvites.confirm(accept, function (err, confirm) { |
472 | //TODO: store confirms for us in the state. |
473 | cb(err, confirm) |
474 | }) |
475 | }) |
476 | }) |
477 | } |
478 | } |
479 | |
480 | return invites |
481 | } |
482 | |
483 | // I am not happy with how big this file is |
484 | // but I can't see a really good line along which to break it up. |
485 | |
486 |
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