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 = honkerhandle(h.Honker)
53 } else {
54 _, h.Handle = honkerhandle(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 = honkerhandle(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.HTML, _ = filt.String(h.Noise)
78 emuxifier := func(e string) string {
79 for _, d := range h.Donks {
80 if d.Name == e {
81 zap[d] = true
82 if d.Local {
83 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
84 }
85 }
86 }
87 return e
88 }
89 h.HTML = template.HTML(re_emus.ReplaceAllStringFunc(string(h.HTML), emuxifier))
90 j := 0
91 for i := 0; i < len(h.Donks); i++ {
92 if !zap[h.Donks[i]] {
93 h.Donks[j] = h.Donks[i]
94 j++
95 }
96 }
97 h.Donks = h.Donks[:j]
98 }
99}
100
101func unsee(zilences []*regexp.Regexp, precis string, noise string) string {
102 for _, z := range zilences {
103 if z.MatchString(precis) || z.MatchString(noise) {
104 if precis == "" {
105 w := z.String()
106 return w[6 : len(w)-3]
107 }
108 return precis
109 }
110 }
111 return ""
112}
113
114func osmosis(honks []*Honk, userid int64) []*Honk {
115 zords := getzords(userid)
116 j := 0
117outer:
118 for _, h := range honks {
119 for _, z := range zords {
120 if z.MatchString(h.Precis) || z.MatchString(h.Noise) {
121 continue outer
122 }
123 }
124 honks[j] = h
125 j++
126 }
127 honks = honks[0:j]
128 return honks
129}
130
131func shortxid(xid string) string {
132 idx := strings.LastIndexByte(xid, '/')
133 if idx == -1 {
134 return xid
135 }
136 return xid[idx+1:]
137}
138
139func xfiltrate() string {
140 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
141 var b [18]byte
142 rand.Read(b[:])
143 for i, c := range b {
144 b[i] = letters[c&63]
145 }
146 s := string(b[:])
147 return s
148}
149
150var re_hashes = regexp.MustCompile(`(?:^|\W)#[[:alnum:]]+`)
151
152func ontologies(s string) []string {
153 m := re_hashes.FindAllString(s, -1)
154 j := 0
155 for _, h := range m {
156 if h[0] == '&' {
157 continue
158 }
159 if h[0] != '#' {
160 h = h[1:]
161 }
162 m[j] = h
163 j++
164 }
165 return m[:j]
166}
167
168type Mention struct {
169 who string
170 where string
171}
172
173var re_mentions = regexp.MustCompile(`@[[:alnum:]._-]+@[[:alnum:].-]*[[:alnum:]]`)
174var re_urltions = regexp.MustCompile(`@https://\S+`)
175
176func grapevine(s string) []string {
177 var mentions []string
178 m := re_mentions.FindAllString(s, -1)
179 for i := range m {
180 where := gofish(m[i])
181 if where != "" {
182 mentions = append(mentions, where)
183 }
184 }
185 m = re_urltions.FindAllString(s, -1)
186 for i := range m {
187 mentions = append(mentions, m[i][1:])
188 }
189 return mentions
190}
191
192func bunchofgrapes(s string) []Mention {
193 m := re_mentions.FindAllString(s, -1)
194 var mentions []Mention
195 for i := range m {
196 where := gofish(m[i])
197 if where != "" {
198 mentions = append(mentions, Mention{who: m[i], where: where})
199 }
200 }
201 m = re_urltions.FindAllString(s, -1)
202 for i := range m {
203 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
204 }
205 return mentions
206}
207
208type Emu struct {
209 ID string
210 Name string
211}
212
213var re_link = regexp.MustCompile(`@?https?://[^\s"]+[\w/)]`)
214var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
215
216func herdofemus(noise string) []Emu {
217 m := re_emus.FindAllString(noise, -1)
218 m = oneofakind(m)
219 var emus []Emu
220 for _, e := range m {
221 fname := e[1 : len(e)-1]
222 _, err := os.Stat("emus/" + fname + ".png")
223 if err != nil {
224 continue
225 }
226 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
227 emus = append(emus, Emu{ID: url, Name: e})
228 }
229 return emus
230}
231
232var re_memes = regexp.MustCompile("meme: ?([[:alnum:]_.-]+)")
233
234func memetize(honk *Honk) {
235 repl := func(x string) string {
236 name := x[5:]
237 if name[0] == ' ' {
238 name = name[1:]
239 }
240 fd, err := os.Open("memes/" + name)
241 if err != nil {
242 log.Printf("no meme for %s", name)
243 return x
244 }
245 var peek [512]byte
246 n, _ := fd.Read(peek[:])
247 ct := http.DetectContentType(peek[:n])
248 fd.Close()
249
250 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
251 res, err := stmtSaveFile.Exec("", name, url, ct, 0, "")
252 if err != nil {
253 log.Printf("error saving meme: %s", err)
254 return x
255 }
256 var d Donk
257 d.FileID, _ = res.LastInsertId()
258 d.XID = ""
259 d.Name = name
260 d.Media = ct
261 d.URL = url
262 d.Local = false
263 honk.Donks = append(honk.Donks, &d)
264 log.Printf("replace with -")
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
374func honkerhandle(h string) (string, string) {
375 m := re_unurl.FindStringSubmatch(h)
376 if len(m) > 2 {
377 return m[2], fmt.Sprintf("%s@%s", m[2], m[1])
378 }
379 return h, h
380}
381
382func prepend(s string, x []string) []string {
383 return append([]string{s}, x...)
384}
385
386// pleroma leaks followers addressed posts to followers
387func butnottooloud(aud []string) {
388 for i, a := range aud {
389 if strings.HasSuffix(a, "/followers") {
390 aud[i] = ""
391 }
392 }
393}
394
395func keepitquiet(aud []string) bool {
396 for _, a := range aud {
397 if a == thewholeworld {
398 return false
399 }
400 }
401 return true
402}
403
404func oneofakind(a []string) []string {
405 var x []string
406 for n, s := range a {
407 if s != "" {
408 x = append(x, s)
409 for i := n + 1; i < len(a); i++ {
410 if a[i] == s {
411 a[i] = ""
412 }
413 }
414 }
415 }
416 return x
417}
418
419var ziggies = make(map[string]*rsa.PrivateKey)
420var zaggies = make(map[string]*rsa.PublicKey)
421var ziggylock sync.Mutex
422
423func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
424 ziggylock.Lock()
425 key = ziggies[username]
426 ziggylock.Unlock()
427 if key == nil {
428 db := opendatabase()
429 row := db.QueryRow("select seckey from users where username = ?", username)
430 var data string
431 row.Scan(&data)
432 var err error
433 key, _, err = httpsig.DecodeKey(data)
434 if err != nil {
435 log.Printf("error decoding %s seckey: %s", username, err)
436 return
437 }
438 ziggylock.Lock()
439 ziggies[username] = key
440 ziggylock.Unlock()
441 }
442 keyname = fmt.Sprintf("https://%s/%s/%s#key", serverName, userSep, username)
443 return
444}
445
446func zaggy(keyname string) (key *rsa.PublicKey) {
447 ziggylock.Lock()
448 key = zaggies[keyname]
449 ziggylock.Unlock()
450 if key != nil {
451 return
452 }
453 row := stmtGetXonker.QueryRow(keyname, "pubkey")
454 var data string
455 err := row.Scan(&data)
456 if err != nil {
457 log.Printf("hitting the webs for missing pubkey: %s", keyname)
458 j, err := GetJunk(keyname)
459 if err != nil {
460 log.Printf("error getting %s pubkey: %s", keyname, err)
461 return
462 }
463 keyobj, ok := j.GetMap("publicKey")
464 if ok {
465 j = keyobj
466 }
467 data, ok = j.GetString("publicKeyPem")
468 if !ok {
469 log.Printf("error finding %s pubkey", keyname)
470 return
471 }
472 _, ok = j.GetString("owner")
473 if !ok {
474 log.Printf("error finding %s pubkey owner", keyname)
475 return
476 }
477 _, key, err = httpsig.DecodeKey(data)
478 if err != nil {
479 log.Printf("error decoding %s pubkey: %s", keyname, err)
480 return
481 }
482 _, err = stmtSaveXonker.Exec(keyname, data, "pubkey")
483 if err != nil {
484 log.Printf("error saving key: %s", err)
485 }
486 } else {
487 _, key, err = httpsig.DecodeKey(data)
488 if err != nil {
489 log.Printf("error decoding %s pubkey: %s", keyname, err)
490 return
491 }
492 }
493 ziggylock.Lock()
494 zaggies[keyname] = key
495 ziggylock.Unlock()
496 return
497}
498
499func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
500 _, err := stmtDeleteXonker.Exec(keyname, "pubkey")
501 if err != nil {
502 log.Printf("error deleting key: %s", err)
503 }
504 ziggylock.Lock()
505 delete(zaggies, keyname)
506 ziggylock.Unlock()
507 return httpsig.VerifyRequest(r, payload, zaggy)
508}
509
510var thumbbiters map[int64]map[string]bool
511var zordses map[int64][]*regexp.Regexp
512var zilences map[int64][]*regexp.Regexp
513var thumblock sync.Mutex
514
515func bitethethumbs() {
516 rows, err := stmtThumbBiters.Query()
517 if err != nil {
518 log.Printf("error getting thumbbiters: %s", err)
519 return
520 }
521 defer rows.Close()
522
523 thumblock.Lock()
524 defer thumblock.Unlock()
525 thumbbiters = make(map[int64]map[string]bool)
526 zordses = make(map[int64][]*regexp.Regexp)
527 zilences = make(map[int64][]*regexp.Regexp)
528 for rows.Next() {
529 var userid int64
530 var name, wherefore string
531 err = rows.Scan(&userid, &name, &wherefore)
532 if err != nil {
533 log.Printf("error scanning zonker: %s", err)
534 continue
535 }
536 if wherefore == "zord" || wherefore == "zilence" {
537 zord := "\\b(?i:" + name + ")\\b"
538 re, err := regexp.Compile(zord)
539 if err != nil {
540 log.Printf("error compiling zord: %s", err)
541 } else {
542 if wherefore == "zord" {
543 zordses[userid] = append(zordses[userid], re)
544 } else {
545 zilences[userid] = append(zilences[userid], re)
546 }
547 }
548 continue
549 }
550 m := thumbbiters[userid]
551 if m == nil {
552 m = make(map[string]bool)
553 thumbbiters[userid] = m
554 }
555 m[name] = true
556 }
557}
558
559func getzords(userid int64) []*regexp.Regexp {
560 thumblock.Lock()
561 defer thumblock.Unlock()
562 return zordses[userid]
563}
564
565func getzilences(userid int64) []*regexp.Regexp {
566 thumblock.Lock()
567 defer thumblock.Unlock()
568 return zilences[userid]
569}
570
571func thoudostbitethythumb(userid int64, who []string, objid string) bool {
572 thumblock.Lock()
573 biters := thumbbiters[userid]
574 thumblock.Unlock()
575 for _, w := range who {
576 if biters[w] {
577 return true
578 }
579 where := originate(w)
580 if where != "" {
581 if biters[where] {
582 return true
583 }
584 }
585 }
586 return false
587}
588
589func keymatch(keyname string, actor string) string {
590 hash := strings.IndexByte(keyname, '#')
591 if hash == -1 {
592 hash = len(keyname)
593 }
594 owner := keyname[0:hash]
595 if owner == actor {
596 return originate(actor)
597 }
598 return ""
599}