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