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