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