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