fun.go (view raw)
1//
2// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
3//
4// Permission to use, copy, modify, and distribute this software for any
5// purpose with or without fee is hereby granted, provided that the above
6// copyright notice and this permission notice appear in all copies.
7//
8// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15
16package main
17
18import (
19 "crypto/rand"
20 "crypto/rsa"
21 "fmt"
22 "html"
23 "html/template"
24 "log"
25 "net/http"
26 "os"
27 "regexp"
28 "strings"
29 "sync"
30
31 "humungus.tedunangst.com/r/webs/htfilter"
32 "humungus.tedunangst.com/r/webs/httpsig"
33)
34
35func reverbolate(userid int64, honks []*Honk) {
36 filt := htfilter.New()
37 zilences := getzilences(userid)
38 for _, h := range honks {
39 h.What += "ed"
40 if h.What == "tonked" {
41 h.What = "honked back"
42 h.Style = "subtle"
43 }
44 if !h.Public {
45 h.Style += " limited"
46 }
47 translate(h)
48 if h.Whofore == 2 || h.Whofore == 3 {
49 h.URL = h.XID
50 if h.What != "bonked" {
51 h.Noise = mentionize(h.Noise)
52 h.Noise = ontologize(h.Noise)
53 }
54 h.Username, h.Handle = handles(h.Honker)
55 } else {
56 _, h.Handle = handles(h.Honker)
57 h.Username = h.Handle
58 if len(h.Username) > 20 {
59 h.Username = h.Username[:20] + ".."
60 }
61 if h.URL == "" {
62 h.URL = h.XID
63 }
64 }
65 if h.Oonker != "" {
66 _, h.Oondle = handles(h.Oonker)
67 }
68 zap := make(map[*Donk]bool)
69 h.Noise = unpucker(h.Noise)
70 h.Open = "open"
71 if badword := unsee(zilences, h.Precis, h.Noise); badword != "" {
72 if h.Precis == "" {
73 h.Precis = badword
74 }
75 h.Open = ""
76 } else if h.Precis == "unspecified horror" {
77 h.Precis = ""
78 }
79 h.Precis = unpucker(h.Precis)
80 h.HTML, _ = filt.String(h.Noise)
81 emuxifier := func(e string) string {
82 for _, d := range h.Donks {
83 if d.Name == e {
84 zap[d] = true
85 if d.Local {
86 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
87 }
88 }
89 }
90 return e
91 }
92 h.HTML = template.HTML(re_emus.ReplaceAllStringFunc(string(h.HTML), emuxifier))
93 j := 0
94 for i := 0; i < len(h.Donks); i++ {
95 if !zap[h.Donks[i]] {
96 h.Donks[j] = h.Donks[i]
97 j++
98 }
99 }
100 h.Donks = h.Donks[:j]
101 }
102}
103
104func translate(honk *Honk) {
105 if honk.Format == "html" {
106 return
107 }
108 noise := honk.Noise
109 if strings.HasPrefix(noise, "DZ:") {
110 idx := strings.Index(noise, "\n")
111 if idx == -1 {
112 honk.Precis = noise
113 noise = ""
114 } else {
115 honk.Precis = noise[:idx]
116 noise = noise[idx+1:]
117 }
118 }
119 honk.Precis = strings.TrimSpace(honk.Precis)
120
121 noise = strings.TrimSpace(noise)
122 noise = quickrename(noise, honk.UserID)
123 noise = obfusbreak(noise)
124 noise = re_memes.ReplaceAllString(noise, "")
125
126 honk.Noise = noise
127 honk.Onts = oneofakind(ontologies(honk.Noise))
128}
129
130func unsee(zilences []*regexp.Regexp, precis string, noise string) string {
131 for _, z := range zilences {
132 if z.MatchString(precis) || z.MatchString(noise) {
133 if precis == "" {
134 w := z.String()
135 return w[6 : len(w)-3]
136 }
137 return precis
138 }
139 }
140 return ""
141}
142
143func osmosis(honks []*Honk, userid int64) []*Honk {
144 zords := getzords(userid)
145 j := 0
146outer:
147 for _, h := range honks {
148 for _, z := range zords {
149 if z.MatchString(h.Precis) || z.MatchString(h.Noise) {
150 continue outer
151 }
152 }
153 honks[j] = h
154 j++
155 }
156 honks = honks[0:j]
157 return honks
158}
159
160func shortxid(xid string) string {
161 idx := strings.LastIndexByte(xid, '/')
162 if idx == -1 {
163 return xid
164 }
165 return xid[idx+1:]
166}
167
168func xfiltrate() string {
169 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
170 var b [18]byte
171 rand.Read(b[:])
172 for i, c := range b {
173 b[i] = letters[c&63]
174 }
175 s := string(b[:])
176 return s
177}
178
179var re_hashes = regexp.MustCompile(`(?:^| )#[[:alnum:]][[:alnum:]_-]*`)
180
181func ontologies(s string) []string {
182 m := re_hashes.FindAllString(s, -1)
183 j := 0
184 for _, h := range m {
185 if h[0] == '&' {
186 continue
187 }
188 if h[0] != '#' {
189 h = h[1:]
190 }
191 m[j] = h
192 j++
193 }
194 return m[:j]
195}
196
197type Mention struct {
198 who string
199 where string
200}
201
202var re_mentions = regexp.MustCompile(`@[[:alnum:]._-]+@[[:alnum:].-]*[[:alnum:]]`)
203var re_urltions = regexp.MustCompile(`@https://\S+`)
204
205func grapevine(s string) []string {
206 var mentions []string
207 m := re_mentions.FindAllString(s, -1)
208 for i := range m {
209 where := gofish(m[i])
210 if where != "" {
211 mentions = append(mentions, where)
212 }
213 }
214 m = re_urltions.FindAllString(s, -1)
215 for i := range m {
216 mentions = append(mentions, m[i][1:])
217 }
218 return mentions
219}
220
221func bunchofgrapes(s string) []Mention {
222 m := re_mentions.FindAllString(s, -1)
223 var mentions []Mention
224 for i := range m {
225 where := gofish(m[i])
226 if where != "" {
227 mentions = append(mentions, Mention{who: m[i], where: where})
228 }
229 }
230 m = re_urltions.FindAllString(s, -1)
231 for i := range m {
232 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
233 }
234 return mentions
235}
236
237type Emu struct {
238 ID string
239 Name string
240}
241
242var re_link = regexp.MustCompile(`@?https?://[^\s"]+[\w/)]`)
243var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
244
245func herdofemus(noise string) []Emu {
246 m := re_emus.FindAllString(noise, -1)
247 m = oneofakind(m)
248 var emus []Emu
249 for _, e := range m {
250 fname := e[1 : len(e)-1]
251 _, err := os.Stat("emus/" + fname + ".png")
252 if err != nil {
253 continue
254 }
255 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
256 emus = append(emus, Emu{ID: url, Name: e})
257 }
258 return emus
259}
260
261var re_memes = regexp.MustCompile("meme: ?([[:alnum:]_.-]+)")
262
263func memetize(honk *Honk) {
264 repl := func(x string) string {
265 name := x[5:]
266 if name[0] == ' ' {
267 name = name[1:]
268 }
269 fd, err := os.Open("memes/" + name)
270 if err != nil {
271 log.Printf("no meme for %s", name)
272 return x
273 }
274 var peek [512]byte
275 n, _ := fd.Read(peek[:])
276 ct := http.DetectContentType(peek[:n])
277 fd.Close()
278
279 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
280 res, err := stmtSaveFile.Exec("", name, url, ct, 0, "")
281 if err != nil {
282 log.Printf("error saving meme: %s", err)
283 return x
284 }
285 var d Donk
286 d.FileID, _ = res.LastInsertId()
287 d.XID = ""
288 d.Name = name
289 d.Media = ct
290 d.URL = url
291 d.Local = false
292 honk.Donks = append(honk.Donks, &d)
293 return ""
294 }
295 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
296}
297
298var re_bolder = regexp.MustCompile(`(^|\W)\*\*([\w\s,.!?'-]+)\*\*($|\W)`)
299var re_italicer = regexp.MustCompile(`(^|\W)\*([\w\s,.!?'-]+)\*($|\W)`)
300var re_bigcoder = regexp.MustCompile("```\n?((?s:.*?))\n?```\n?")
301var re_coder = regexp.MustCompile("`([^`]*)`")
302var re_quoter = regexp.MustCompile(`(?m:^> (.*)\n?)`)
303
304func markitzero(s string) string {
305 var bigcodes []string
306 bigsaver := func(code string) string {
307 bigcodes = append(bigcodes, code)
308 return "``````"
309 }
310 s = re_bigcoder.ReplaceAllStringFunc(s, bigsaver)
311 var lilcodes []string
312 lilsaver := func(code string) string {
313 lilcodes = append(lilcodes, code)
314 return "`x`"
315 }
316 s = re_coder.ReplaceAllStringFunc(s, lilsaver)
317 s = re_bolder.ReplaceAllString(s, "$1<b>$2</b>$3")
318 s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
319 s = re_quoter.ReplaceAllString(s, "<blockquote>$1</blockquote><p>")
320 lilun := func(s string) string {
321 code := lilcodes[0]
322 lilcodes = lilcodes[1:]
323 return code
324 }
325 s = re_coder.ReplaceAllStringFunc(s, lilun)
326 bigun := func(s string) string {
327 code := bigcodes[0]
328 bigcodes = bigcodes[1:]
329 return code
330 }
331 s = re_bigcoder.ReplaceAllStringFunc(s, bigun)
332 s = re_bigcoder.ReplaceAllString(s, "<pre><code>$1</code></pre><p>")
333 s = re_coder.ReplaceAllString(s, "<code>$1</code>")
334 return s
335}
336
337func obfusbreak(s string) string {
338 s = strings.TrimSpace(s)
339 s = strings.Replace(s, "\r", "", -1)
340 s = html.EscapeString(s)
341 // dammit go
342 s = strings.Replace(s, "'", "'", -1)
343 linkfn := func(url string) string {
344 if url[0] == '@' {
345 return url
346 }
347 addparen := false
348 adddot := false
349 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
350 url = url[:len(url)-1]
351 addparen = true
352 }
353 if strings.HasSuffix(url, ".") {
354 url = url[:len(url)-1]
355 adddot = true
356 }
357 url = fmt.Sprintf(`<a class="mention u-url" href="%s">%s</a>`, url, url)
358 if adddot {
359 url += "."
360 }
361 if addparen {
362 url += ")"
363 }
364 return url
365 }
366 s = re_link.ReplaceAllStringFunc(s, linkfn)
367
368 s = markitzero(s)
369
370 s = strings.Replace(s, "\n", "<br>", -1)
371 return s
372}
373
374var re_quickmention = regexp.MustCompile("(^| )@[[:alnum:]]+ ")
375
376func quickrename(s string, userid int64) string {
377 return re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
378 prefix := ""
379 if m[0] == ' ' {
380 prefix = " "
381 m = m[1:]
382 }
383 prefix += "@"
384 m = m[1:]
385 m = m[:len(m)-1]
386
387 row := stmtOneHonker.QueryRow(m, userid)
388 var xid string
389 err := row.Scan(&xid)
390 if err == nil {
391 _, name := handles(xid)
392 if name != "" {
393 m = name
394 }
395 }
396 return prefix + m + " "
397 })
398}
399
400func mentionize(s string) string {
401 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
402 where := gofish(m)
403 if where == "" {
404 return m
405 }
406 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
407 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
408 html.EscapeString(where), html.EscapeString(who))
409 })
410 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
411 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
412 html.EscapeString(m[1:]), html.EscapeString(m))
413 })
414 return s
415}
416
417func ontologize(s string) string {
418 s = re_hashes.ReplaceAllStringFunc(s, func(o string) string {
419 if o[0] == '&' {
420 return o
421 }
422 p := ""
423 h := o
424 if h[0] != '#' {
425 p = h[:1]
426 h = h[1:]
427 }
428 return fmt.Sprintf(`%s<a class="mention u-url" href="https://%s/o/%s">%s</a>`, p, serverName,
429 strings.ToLower(h[1:]), h)
430 })
431 return s
432}
433
434var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
435var re_urlhost = regexp.MustCompile("https://([^/]+)")
436
437func originate(u string) string {
438 m := re_urlhost.FindStringSubmatch(u)
439 if len(m) > 1 {
440 return m[1]
441 }
442 return ""
443}
444
445var allhandles = make(map[string]string)
446var handlelock sync.Mutex
447
448// handle, handle@host
449func handles(xid string) (string, string) {
450 if xid == "" {
451 return "", ""
452 }
453 handlelock.Lock()
454 handle := allhandles[xid]
455 handlelock.Unlock()
456 if handle == "" {
457 handle = findhandle(xid)
458 handlelock.Lock()
459 allhandles[xid] = handle
460 handlelock.Unlock()
461 }
462 if handle == xid {
463 return xid, xid
464 }
465 return handle, handle + "@" + originate(xid)
466}
467
468func findhandle(xid string) string {
469 row := stmtGetXonker.QueryRow(xid, "handle")
470 var handle string
471 err := row.Scan(&handle)
472 if err != nil {
473 p, _ := investigate(xid)
474 if p == nil {
475 m := re_unurl.FindStringSubmatch(xid)
476 if len(m) > 2 {
477 handle = m[2]
478 } else {
479 handle = xid
480 }
481 } else {
482 handle = p.Handle
483 }
484 _, err = stmtSaveXonker.Exec(xid, handle, "handle")
485 if err != nil {
486 log.Printf("error saving handle: %s", err)
487 }
488 }
489 return handle
490}
491
492var handleprelock sync.Mutex
493
494func prehandle(xid string) {
495 handleprelock.Lock()
496 defer handleprelock.Unlock()
497 handles(xid)
498}
499
500func prepend(s string, x []string) []string {
501 return append([]string{s}, x...)
502}
503
504// pleroma leaks followers addressed posts to followers
505func butnottooloud(aud []string) {
506 for i, a := range aud {
507 if strings.HasSuffix(a, "/followers") {
508 aud[i] = ""
509 }
510 }
511}
512
513func keepitquiet(aud []string) bool {
514 for _, a := range aud {
515 if a == thewholeworld {
516 return false
517 }
518 }
519 return true
520}
521
522func firstclass(honk *Honk) bool {
523 return honk.Audience[0] == thewholeworld
524}
525
526func oneofakind(a []string) []string {
527 var x []string
528 for n, s := range a {
529 if s != "" {
530 x = append(x, s)
531 for i := n + 1; i < len(a); i++ {
532 if a[i] == s {
533 a[i] = ""
534 }
535 }
536 }
537 }
538 return x
539}
540
541var ziggies = make(map[string]*rsa.PrivateKey)
542var zaggies = make(map[string]*rsa.PublicKey)
543var ziggylock sync.Mutex
544
545func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
546 ziggylock.Lock()
547 key = ziggies[username]
548 ziggylock.Unlock()
549 if key == nil {
550 db := opendatabase()
551 row := db.QueryRow("select seckey from users where username = ?", username)
552 var data string
553 row.Scan(&data)
554 var err error
555 key, _, err = httpsig.DecodeKey(data)
556 if err != nil {
557 log.Printf("error decoding %s seckey: %s", username, err)
558 return
559 }
560 ziggylock.Lock()
561 ziggies[username] = key
562 ziggylock.Unlock()
563 }
564 keyname = fmt.Sprintf("https://%s/%s/%s#key", serverName, userSep, username)
565 return
566}
567
568func zaggy(keyname string) (key *rsa.PublicKey) {
569 ziggylock.Lock()
570 key = zaggies[keyname]
571 ziggylock.Unlock()
572 if key != nil {
573 return
574 }
575 row := stmtGetXonker.QueryRow(keyname, "pubkey")
576 var data string
577 err := row.Scan(&data)
578 if err != nil {
579 log.Printf("hitting the webs for missing pubkey: %s", keyname)
580 j, err := GetJunk(keyname)
581 if err != nil {
582 log.Printf("error getting %s pubkey: %s", keyname, err)
583 return
584 }
585 keyobj, ok := j.GetMap("publicKey")
586 if ok {
587 j = keyobj
588 }
589 data, ok = j.GetString("publicKeyPem")
590 if !ok {
591 log.Printf("error finding %s pubkey", keyname)
592 return
593 }
594 _, ok = j.GetString("owner")
595 if !ok {
596 log.Printf("error finding %s pubkey owner", keyname)
597 return
598 }
599 _, key, err = httpsig.DecodeKey(data)
600 if err != nil {
601 log.Printf("error decoding %s pubkey: %s", keyname, err)
602 return
603 }
604 _, err = stmtSaveXonker.Exec(keyname, data, "pubkey")
605 if err != nil {
606 log.Printf("error saving key: %s", err)
607 }
608 } else {
609 _, key, err = httpsig.DecodeKey(data)
610 if err != nil {
611 log.Printf("error decoding %s pubkey: %s", keyname, err)
612 return
613 }
614 }
615 ziggylock.Lock()
616 zaggies[keyname] = key
617 ziggylock.Unlock()
618 return
619}
620
621func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
622 _, err := stmtDeleteXonker.Exec(keyname, "pubkey")
623 if err != nil {
624 log.Printf("error deleting key: %s", err)
625 }
626 ziggylock.Lock()
627 delete(zaggies, keyname)
628 ziggylock.Unlock()
629 return httpsig.VerifyRequest(r, payload, zaggy)
630}
631
632var thumbbiters map[int64]map[string]bool
633var zordses map[int64][]*regexp.Regexp
634var zilences map[int64][]*regexp.Regexp
635var thumblock sync.Mutex
636
637func bitethethumbs() {
638 rows, err := stmtThumbBiters.Query()
639 if err != nil {
640 log.Printf("error getting thumbbiters: %s", err)
641 return
642 }
643 defer rows.Close()
644
645 thumblock.Lock()
646 defer thumblock.Unlock()
647 thumbbiters = make(map[int64]map[string]bool)
648 zordses = make(map[int64][]*regexp.Regexp)
649 zilences = make(map[int64][]*regexp.Regexp)
650 for rows.Next() {
651 var userid int64
652 var name, wherefore string
653 err = rows.Scan(&userid, &name, &wherefore)
654 if err != nil {
655 log.Printf("error scanning zonker: %s", err)
656 continue
657 }
658 if wherefore == "zord" || wherefore == "zilence" {
659 zord := "\\b(?i:" + name + ")\\b"
660 re, err := regexp.Compile(zord)
661 if err != nil {
662 log.Printf("error compiling zord: %s", err)
663 } else {
664 if wherefore == "zord" {
665 zordses[userid] = append(zordses[userid], re)
666 } else {
667 zilences[userid] = append(zilences[userid], re)
668 }
669 }
670 continue
671 }
672 m := thumbbiters[userid]
673 if m == nil {
674 m = make(map[string]bool)
675 thumbbiters[userid] = m
676 }
677 m[name] = true
678 }
679}
680
681func getzords(userid int64) []*regexp.Regexp {
682 thumblock.Lock()
683 defer thumblock.Unlock()
684 return zordses[userid]
685}
686
687func getzilences(userid int64) []*regexp.Regexp {
688 thumblock.Lock()
689 defer thumblock.Unlock()
690 return zilences[userid]
691}
692
693func thoudostbitethythumb(userid int64, who []string, objid string) bool {
694 thumblock.Lock()
695 biters := thumbbiters[userid]
696 thumblock.Unlock()
697 objwhere := originate(objid)
698 if objwhere != "" && biters[objwhere] {
699 log.Printf("thumbbiter: %s", objid)
700 return true
701 }
702 for _, w := range who {
703 if biters[w] {
704 log.Printf("thumbbiter: %s", w)
705 return true
706 }
707 where := originate(w)
708 if where != "" {
709 if biters[where] {
710 log.Printf("thumbbiter: %s", w)
711 return true
712 }
713 }
714 }
715 return false
716}
717
718func keymatch(keyname string, actor string) string {
719 hash := strings.IndexByte(keyname, '#')
720 if hash == -1 {
721 hash = len(keyname)
722 }
723 owner := keyname[0:hash]
724 if owner == actor {
725 return originate(actor)
726 }
727 return ""
728}