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