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)
33
34func reverbolate(userid int64, honks []*Honk) {
35 filt := htfilter.New()
36 zilences := getzilences(userid)
37 for _, h := range honks {
38 h.What += "ed"
39 if h.What == "tonked" {
40 h.What = "honked back"
41 h.Style = "subtle"
42 }
43 if !h.Public {
44 h.Style = "limited"
45 }
46 if h.Whofore == 2 || h.Whofore == 3 {
47 h.URL = h.XID
48 h.Noise = mentionize(h.Noise)
49 h.Username, h.Handle = honkerhandle(h.Honker)
50 } else {
51 _, h.Handle = honkerhandle(h.Honker)
52 h.Username = h.Handle
53 if len(h.Username) > 20 {
54 h.Username = h.Username[:20] + ".."
55 }
56 if h.URL == "" {
57 h.URL = h.XID
58 }
59 }
60 if h.Oonker != "" {
61 _, h.Oondle = honkerhandle(h.Oonker)
62 }
63 zap := make(map[*Donk]bool)
64 h.Noise = unpucker(h.Noise)
65 h.Open = "open"
66 if badword := unsee(zilences, h.Precis, h.Noise); badword != "" {
67 if h.Precis == "" {
68 h.Precis = badword
69 }
70 h.Open = ""
71 } else if h.Precis == "unspecified horror" {
72 h.Precis = ""
73 }
74 h.HTML, _ = filt.String(h.Noise)
75 emuxifier := func(e string) string {
76 for _, d := range h.Donks {
77 if d.Name == e {
78 zap[d] = true
79 if d.Local {
80 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
81 }
82 }
83 }
84 return e
85 }
86 h.HTML = template.HTML(re_emus.ReplaceAllStringFunc(string(h.HTML), emuxifier))
87 j := 0
88 for i := 0; i < len(h.Donks); i++ {
89 if !zap[h.Donks[i]] {
90 h.Donks[j] = h.Donks[i]
91 j++
92 }
93 }
94 h.Donks = h.Donks[:j]
95 }
96}
97
98func unsee(zilences []*regexp.Regexp, precis string, noise string) string {
99 for _, z := range zilences {
100 if z.MatchString(precis) || z.MatchString(noise) {
101 if precis == "" {
102 w := z.String()
103 return w[6 : len(w)-3]
104 }
105 return precis
106 }
107 }
108 return ""
109}
110
111func osmosis(honks []*Honk, userid int64) []*Honk {
112 zords := getzords(userid)
113 for i, j := 0, len(honks)-1; i < j; i, j = i+1, j-1 {
114 honks[i], honks[j] = honks[j], honks[i]
115 }
116
117 j := 0
118 filtered := make(map[string]bool)
119outer:
120 for _, h := range honks {
121 if h.RID != "" && filtered[h.RID] {
122 filtered[h.XID] = true
123 continue outer
124 }
125
126 for _, z := range zords {
127 if z.MatchString(h.Precis) || z.MatchString(h.Noise) {
128 filtered[h.XID] = true
129 continue outer
130 }
131 }
132 honks[j] = h
133 j++
134 }
135 honks = honks[0:j]
136 for i, j := 0, len(honks)-1; i < j; i, j = i+1, j-1 {
137 honks[i], honks[j] = honks[j], honks[i]
138 }
139 return honks
140}
141
142func shortxid(xid string) string {
143 idx := strings.LastIndexByte(xid, '/')
144 if idx == -1 {
145 return xid
146 }
147 return xid[idx+1:]
148}
149
150func xfiltrate() string {
151 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
152 var b [18]byte
153 rand.Read(b[:])
154 for i, c := range b {
155 b[i] = letters[c&63]
156 }
157 s := string(b[:])
158 return s
159}
160
161var re_hashes = regexp.MustCompile(`(?:^|\W)#[[:alnum:]]+`)
162
163func ontologies(s string) []string {
164 m := re_hashes.FindAllString(s, -1)
165 j := 0
166 for _, h := range m {
167 if h[0] == '&' {
168 continue
169 }
170 if h[0] != '#' {
171 h = h[1:]
172 }
173 m[j] = h
174 j++
175 }
176 return m[:j]
177}
178
179type Mention struct {
180 who string
181 where string
182}
183
184var re_mentions = regexp.MustCompile(`@[[:alnum:]._-]+@[[:alnum:].-]*[[:alnum:]]`)
185var re_urltions = regexp.MustCompile(`@https://\S+`)
186
187func grapevine(s string) []string {
188 var mentions []string
189 m := re_mentions.FindAllString(s, -1)
190 for i := range m {
191 where := gofish(m[i])
192 if where != "" {
193 mentions = append(mentions, where)
194 }
195 }
196 m = re_urltions.FindAllString(s, -1)
197 for i := range m {
198 mentions = append(mentions, m[i][1:])
199 }
200 return mentions
201}
202
203func bunchofgrapes(s string) []Mention {
204 m := re_mentions.FindAllString(s, -1)
205 var mentions []Mention
206 for i := range m {
207 where := gofish(m[i])
208 if where != "" {
209 mentions = append(mentions, Mention{who: m[i], where: where})
210 }
211 }
212 m = re_urltions.FindAllString(s, -1)
213 for i := range m {
214 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
215 }
216 return mentions
217}
218
219type Emu struct {
220 ID string
221 Name string
222}
223
224var re_link = regexp.MustCompile(`@?https?://[^\s"]+[\w/)]`)
225var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
226
227func herdofemus(noise string) []Emu {
228 m := re_emus.FindAllString(noise, -1)
229 m = oneofakind(m)
230 var emus []Emu
231 for _, e := range m {
232 fname := e[1 : len(e)-1]
233 _, err := os.Stat("emus/" + fname + ".png")
234 if err != nil {
235 continue
236 }
237 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
238 emus = append(emus, Emu{ID: url, Name: e})
239 }
240 return emus
241}
242
243var re_memes = regexp.MustCompile("meme: ?([[:alnum:]_.-]+)")
244
245func memetize(honk *Honk) {
246 repl := func(x string) string {
247 name := x[5:]
248 if name[0] == ' ' {
249 name = name[1:]
250 }
251 fd, err := os.Open("memes/" + name)
252 if err != nil {
253 log.Printf("no meme for %s", name)
254 return x
255 }
256 var peek [512]byte
257 n, _ := fd.Read(peek[:])
258 ct := http.DetectContentType(peek[:n])
259 fd.Close()
260
261 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
262 res, err := stmtSaveFile.Exec("", name, url, ct, 0, "")
263 if err != nil {
264 log.Printf("error saving meme: %s", err)
265 return x
266 }
267 var d Donk
268 d.FileID, _ = res.LastInsertId()
269 d.XID = ""
270 d.Name = name
271 d.Media = ct
272 d.URL = url
273 d.Local = false
274 honk.Donks = append(honk.Donks, &d)
275 log.Printf("replace with -")
276 return ""
277 }
278 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
279}
280
281var re_bolder = regexp.MustCompile(`(^|\W)\*\*([\w\s,.!?'-]+)\*\*($|\W)`)
282var re_italicer = regexp.MustCompile(`(^|\W)\*([\w\s,.!?'-]+)\*($|\W)`)
283var re_bigcoder = regexp.MustCompile("```\n?((?s:.*?))\n?```\n?")
284var re_coder = regexp.MustCompile("`([^`]*)`")
285var re_quoter = regexp.MustCompile(`(?m:^> (.*)\n?)`)
286
287func markitzero(s string) string {
288 var bigcodes []string
289 bigsaver := func(code string) string {
290 bigcodes = append(bigcodes, code)
291 return "``````"
292 }
293 s = re_bigcoder.ReplaceAllStringFunc(s, bigsaver)
294 var lilcodes []string
295 lilsaver := func(code string) string {
296 lilcodes = append(lilcodes, code)
297 return "`x`"
298 }
299 s = re_coder.ReplaceAllStringFunc(s, lilsaver)
300 s = re_bolder.ReplaceAllString(s, "$1<b>$2</b>$3")
301 s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
302 s = re_quoter.ReplaceAllString(s, "<blockquote>$1</blockquote><p>")
303 lilun := func(s string) string {
304 code := lilcodes[0]
305 lilcodes = lilcodes[1:]
306 return code
307 }
308 s = re_coder.ReplaceAllStringFunc(s, lilun)
309 bigun := func(s string) string {
310 code := bigcodes[0]
311 bigcodes = bigcodes[1:]
312 return code
313 }
314 s = re_bigcoder.ReplaceAllStringFunc(s, bigun)
315 s = re_bigcoder.ReplaceAllString(s, "<pre><code>$1</code></pre><p>")
316 s = re_coder.ReplaceAllString(s, "<code>$1</code>")
317 return s
318}
319
320func obfusbreak(s string) string {
321 s = strings.TrimSpace(s)
322 s = strings.Replace(s, "\r", "", -1)
323 s = html.EscapeString(s)
324 // dammit go
325 s = strings.Replace(s, "'", "'", -1)
326 linkfn := func(url string) string {
327 if url[0] == '@' {
328 return url
329 }
330 addparen := false
331 adddot := false
332 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
333 url = url[:len(url)-1]
334 addparen = true
335 }
336 if strings.HasSuffix(url, ".") {
337 url = url[:len(url)-1]
338 adddot = true
339 }
340 url = fmt.Sprintf(`<a class="mention" href="%s">%s</a>`, url, url)
341 if adddot {
342 url += "."
343 }
344 if addparen {
345 url += ")"
346 }
347 return url
348 }
349 s = re_link.ReplaceAllStringFunc(s, linkfn)
350
351 s = markitzero(s)
352
353 s = strings.Replace(s, "\n", "<br>", -1)
354 return s
355}
356
357func mentionize(s string) string {
358 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
359 where := gofish(m)
360 if where == "" {
361 return m
362 }
363 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
364 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
365 html.EscapeString(where), html.EscapeString(who))
366 })
367 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
368 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
369 html.EscapeString(m[1:]), html.EscapeString(m))
370 })
371 return s
372}
373
374var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
375var re_urlhost = regexp.MustCompile("https://([^/]+)")
376
377func originate(u string) string {
378 m := re_urlhost.FindStringSubmatch(u)
379 if len(m) > 1 {
380 return m[1]
381 }
382 return ""
383}
384
385func honkerhandle(h string) (string, string) {
386 m := re_unurl.FindStringSubmatch(h)
387 if len(m) > 2 {
388 return m[2], fmt.Sprintf("%s@%s", m[2], m[1])
389 }
390 return h, h
391}
392
393func prepend(s string, x []string) []string {
394 return append([]string{s}, x...)
395}
396
397// pleroma leaks followers addressed posts to followers
398func butnottooloud(aud []string) {
399 for i, a := range aud {
400 if strings.HasSuffix(a, "/followers") {
401 aud[i] = ""
402 }
403 }
404}
405
406func keepitquiet(aud []string) bool {
407 for _, a := range aud {
408 if a == thewholeworld {
409 return false
410 }
411 }
412 return true
413}
414
415func oneofakind(a []string) []string {
416 var x []string
417 for n, s := range a {
418 if s != "" {
419 x = append(x, s)
420 for i := n + 1; i < len(a); i++ {
421 if a[i] == s {
422 a[i] = ""
423 }
424 }
425 }
426 }
427 return x
428}
429
430var ziggies = make(map[string]*rsa.PrivateKey)
431var zaggies = make(map[string]*rsa.PublicKey)
432var ziggylock sync.Mutex
433
434func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
435 ziggylock.Lock()
436 key = ziggies[username]
437 ziggylock.Unlock()
438 if key == nil {
439 db := opendatabase()
440 row := db.QueryRow("select seckey from users where username = ?", username)
441 var data string
442 row.Scan(&data)
443 var err error
444 key, _, err = pez(data)
445 if err != nil {
446 log.Printf("error decoding %s seckey: %s", username, err)
447 return
448 }
449 ziggylock.Lock()
450 ziggies[username] = key
451 ziggylock.Unlock()
452 }
453 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
454 return
455}
456
457func zaggy(keyname string) (key *rsa.PublicKey) {
458 ziggylock.Lock()
459 key = zaggies[keyname]
460 ziggylock.Unlock()
461 if key != nil {
462 return
463 }
464 row := stmtGetXonker.QueryRow(keyname, "pubkey")
465 var data string
466 err := row.Scan(&data)
467 if err != nil {
468 log.Printf("hitting the webs for missing pubkey: %s", keyname)
469 j, err := GetJunk(keyname)
470 if err != nil {
471 log.Printf("error getting %s pubkey: %s", keyname, err)
472 return
473 }
474 var ok bool
475 data, ok = j.FindString([]string{"publicKey", "publicKeyPem"})
476 if !ok {
477 log.Printf("error finding %s pubkey", keyname)
478 return
479 }
480 _, ok = j.FindString([]string{"publicKey", "owner"})
481 if !ok {
482 log.Printf("error finding %s pubkey owner", keyname)
483 return
484 }
485 _, key, err = pez(data)
486 if err != nil {
487 log.Printf("error decoding %s pubkey: %s", keyname, err)
488 return
489 }
490 _, err = stmtSaveXonker.Exec(keyname, data, "pubkey")
491 if err != nil {
492 log.Printf("error saving key: %s", err)
493 }
494 } else {
495 _, key, err = pez(data)
496 if err != nil {
497 log.Printf("error decoding %s pubkey: %s", keyname, err)
498 return
499 }
500 }
501 ziggylock.Lock()
502 zaggies[keyname] = key
503 ziggylock.Unlock()
504 return
505}
506
507func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
508 _, err := stmtDeleteXonker.Exec(keyname, "pubkey")
509 if err != nil {
510 log.Printf("error deleting key: %s", err)
511 }
512 ziggylock.Lock()
513 delete(zaggies, keyname)
514 ziggylock.Unlock()
515 return zag(r, payload)
516}
517
518var thumbbiters map[int64]map[string]bool
519var zordses map[int64][]*regexp.Regexp
520var zilences map[int64][]*regexp.Regexp
521var thumblock sync.Mutex
522
523func bitethethumbs() {
524 rows, err := stmtThumbBiters.Query()
525 if err != nil {
526 log.Printf("error getting thumbbiters: %s", err)
527 return
528 }
529 defer rows.Close()
530
531 thumblock.Lock()
532 defer thumblock.Unlock()
533 thumbbiters = make(map[int64]map[string]bool)
534 zordses = make(map[int64][]*regexp.Regexp)
535 zilences = make(map[int64][]*regexp.Regexp)
536 for rows.Next() {
537 var userid int64
538 var name, wherefore string
539 err = rows.Scan(&userid, &name, &wherefore)
540 if err != nil {
541 log.Printf("error scanning zonker: %s", err)
542 continue
543 }
544 if wherefore == "zord" || wherefore == "zilence" {
545 zord := "\\b(?i:" + name + ")\\b"
546 re, err := regexp.Compile(zord)
547 if err != nil {
548 log.Printf("error compiling zord: %s", err)
549 } else {
550 if wherefore == "zord" {
551 zordses[userid] = append(zordses[userid], re)
552 } else {
553 zilences[userid] = append(zilences[userid], re)
554 }
555 }
556 continue
557 }
558 m := thumbbiters[userid]
559 if m == nil {
560 m = make(map[string]bool)
561 thumbbiters[userid] = m
562 }
563 m[name] = true
564 }
565}
566
567func getzords(userid int64) []*regexp.Regexp {
568 thumblock.Lock()
569 defer thumblock.Unlock()
570 return zordses[userid]
571}
572
573func getzilences(userid int64) []*regexp.Regexp {
574 thumblock.Lock()
575 defer thumblock.Unlock()
576 return zilences[userid]
577}
578
579func thoudostbitethythumb(userid int64, who []string, objid string) bool {
580 thumblock.Lock()
581 biters := thumbbiters[userid]
582 thumblock.Unlock()
583 for _, w := range who {
584 if biters[w] {
585 return true
586 }
587 where := originate(w)
588 if where != "" {
589 if biters[where] {
590 return true
591 }
592 }
593 }
594 return false
595}
596
597func keymatch(keyname string, actor string) string {
598 hash := strings.IndexByte(keyname, '#')
599 if hash == -1 {
600 hash = len(keyname)
601 }
602 owner := keyname[0:hash]
603 if owner == actor {
604 return originate(actor)
605 }
606 return ""
607}