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