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