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