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 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
197 emus = append(emus, Emu{ID: url, Name: e})
198 }
199 return emus
200}
201
202var re_memes = regexp.MustCompile("meme: ?([[:alnum:]_.-]+)")
203
204func memetize(honk *Honk) {
205 repl := func(x string) string {
206 name := x[5:]
207 if name[0] == ' ' {
208 name = name[1:]
209 }
210 fd, err := os.Open("memes/" + name)
211 if err != nil {
212 log.Printf("no meme for %s", name)
213 return x
214 }
215 var peek [512]byte
216 n, _ := fd.Read(peek[:])
217 ct := http.DetectContentType(peek[:n])
218 fd.Close()
219
220 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
221 res, err := stmtSaveFile.Exec("", name, url, ct, 0, "")
222 if err != nil {
223 log.Printf("error saving meme: %s", err)
224 return x
225 }
226 var d Donk
227 d.FileID, _ = res.LastInsertId()
228 d.XID = ""
229 d.Name = name
230 d.Media = ct
231 d.URL = url
232 d.Local = false
233 honk.Donks = append(honk.Donks, &d)
234 log.Printf("replace with -")
235 return ""
236 }
237 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
238}
239
240var re_bolder = regexp.MustCompile(`(^|\W)\*\*([\w\s,.!?'-]+)\*\*($|\W)`)
241var re_italicer = regexp.MustCompile(`(^|\W)\*([\w\s,.!?'-]+)\*($|\W)`)
242var re_bigcoder = regexp.MustCompile("```\n?((?s:.*?))\n?```\n?")
243var re_coder = regexp.MustCompile("`([^`]*)`")
244var re_quoter = regexp.MustCompile(`(?m:^> (.*)\n?)`)
245
246func markitzero(s string) string {
247 var bigcodes []string
248 bigsaver := func(code string) string {
249 bigcodes = append(bigcodes, code)
250 return "``````"
251 }
252 s = re_bigcoder.ReplaceAllStringFunc(s, bigsaver)
253 var lilcodes []string
254 lilsaver := func(code string) string {
255 lilcodes = append(lilcodes, code)
256 return "`x`"
257 }
258 s = re_coder.ReplaceAllStringFunc(s, lilsaver)
259 s = re_bolder.ReplaceAllString(s, "$1<b>$2</b>$3")
260 s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
261 s = re_quoter.ReplaceAllString(s, "<blockquote>$1</blockquote><p>")
262 lilun := func(s string) string {
263 code := lilcodes[0]
264 lilcodes = lilcodes[1:]
265 return code
266 }
267 s = re_coder.ReplaceAllStringFunc(s, lilun)
268 bigun := func(s string) string {
269 code := bigcodes[0]
270 bigcodes = bigcodes[1:]
271 return code
272 }
273 s = re_bigcoder.ReplaceAllStringFunc(s, bigun)
274 s = re_bigcoder.ReplaceAllString(s, "<pre><code>$1</code></pre><p>")
275 s = re_coder.ReplaceAllString(s, "<code>$1</code>")
276 return s
277}
278
279func obfusbreak(s string) string {
280 s = strings.TrimSpace(s)
281 s = strings.Replace(s, "\r", "", -1)
282 s = html.EscapeString(s)
283 // dammit go
284 s = strings.Replace(s, "'", "'", -1)
285 linkfn := func(url string) string {
286 if url[0] == '@' {
287 return url
288 }
289 addparen := false
290 adddot := false
291 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
292 url = url[:len(url)-1]
293 addparen = true
294 }
295 if strings.HasSuffix(url, ".") {
296 url = url[:len(url)-1]
297 adddot = true
298 }
299 url = fmt.Sprintf(`<a class="mention" href="%s">%s</a>`, url, url)
300 if adddot {
301 url += "."
302 }
303 if addparen {
304 url += ")"
305 }
306 return url
307 }
308 s = re_link.ReplaceAllStringFunc(s, linkfn)
309
310 s = markitzero(s)
311
312 s = strings.Replace(s, "\n", "<br>", -1)
313 return s
314}
315
316func mentionize(s string) string {
317 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
318 where := gofish(m)
319 if where == "" {
320 return m
321 }
322 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
323 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
324 html.EscapeString(where), html.EscapeString(who))
325 })
326 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
327 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
328 html.EscapeString(m[1:]), html.EscapeString(m))
329 })
330 return s
331}
332
333var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
334var re_urlhost = regexp.MustCompile("https://([^/]+)")
335
336func originate(u string) string {
337 m := re_urlhost.FindStringSubmatch(u)
338 if len(m) > 1 {
339 return m[1]
340 }
341 return ""
342}
343
344func honkerhandle(h string) (string, string) {
345 m := re_unurl.FindStringSubmatch(h)
346 if len(m) > 2 {
347 return m[2], fmt.Sprintf("%s@%s", m[2], m[1])
348 }
349 return h, h
350}
351
352func prepend(s string, x []string) []string {
353 return append([]string{s}, x...)
354}
355
356// pleroma leaks followers addressed posts to followers
357func butnottooloud(aud []string) {
358 for i, a := range aud {
359 if strings.HasSuffix(a, "/followers") {
360 aud[i] = ""
361 }
362 }
363}
364
365func keepitquiet(aud []string) bool {
366 for _, a := range aud {
367 if a == thewholeworld {
368 return false
369 }
370 }
371 return true
372}
373
374func oneofakind(a []string) []string {
375 var x []string
376 for n, s := range a {
377 if s != "" {
378 x = append(x, s)
379 for i := n + 1; i < len(a); i++ {
380 if a[i] == s {
381 a[i] = ""
382 }
383 }
384 }
385 }
386 return x
387}
388
389var ziggies = make(map[string]*rsa.PrivateKey)
390var zaggies = make(map[string]*rsa.PublicKey)
391var ziggylock sync.Mutex
392
393func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
394 ziggylock.Lock()
395 key = ziggies[username]
396 ziggylock.Unlock()
397 if key == nil {
398 db := opendatabase()
399 row := db.QueryRow("select seckey from users where username = ?", username)
400 var data string
401 row.Scan(&data)
402 var err error
403 key, _, err = pez(data)
404 if err != nil {
405 log.Printf("error decoding %s seckey: %s", username, err)
406 return
407 }
408 ziggylock.Lock()
409 ziggies[username] = key
410 ziggylock.Unlock()
411 }
412 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
413 return
414}
415
416func zaggy(keyname string) (key *rsa.PublicKey) {
417 ziggylock.Lock()
418 key = zaggies[keyname]
419 ziggylock.Unlock()
420 if key != nil {
421 return
422 }
423 row := stmtGetXonker.QueryRow(keyname, "pubkey")
424 var data string
425 err := row.Scan(&data)
426 if err != nil {
427 log.Printf("hitting the webs for missing pubkey: %s", keyname)
428 j, err := GetJunk(keyname)
429 if err != nil {
430 log.Printf("error getting %s pubkey: %s", keyname, err)
431 return
432 }
433 var ok bool
434 data, ok = j.FindString([]string{"publicKey", "publicKeyPem"})
435 if !ok {
436 log.Printf("error finding %s pubkey", keyname)
437 return
438 }
439 _, ok = j.FindString([]string{"publicKey", "owner"})
440 if !ok {
441 log.Printf("error finding %s pubkey owner", keyname)
442 return
443 }
444 _, key, err = pez(data)
445 if err != nil {
446 log.Printf("error decoding %s pubkey: %s", keyname, err)
447 return
448 }
449 _, err = stmtSaveXonker.Exec(keyname, data, "pubkey")
450 if err != nil {
451 log.Printf("error saving key: %s", err)
452 }
453 } else {
454 _, key, err = pez(data)
455 if err != nil {
456 log.Printf("error decoding %s pubkey: %s", keyname, err)
457 return
458 }
459 }
460 ziggylock.Lock()
461 zaggies[keyname] = key
462 ziggylock.Unlock()
463 return
464}
465
466func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
467 _, err := stmtDeleteXonker.Exec(keyname, "pubkey")
468 if err != nil {
469 log.Printf("error deleting key: %s", err)
470 }
471 ziggylock.Lock()
472 delete(zaggies, keyname)
473 ziggylock.Unlock()
474 return zag(r, payload)
475}
476
477var thumbbiters map[int64]map[string]bool
478var zordses map[int64][]*regexp.Regexp
479var thumblock sync.Mutex
480
481func bitethethumbs() {
482 rows, err := stmtThumbBiters.Query()
483 if err != nil {
484 log.Printf("error getting thumbbiters: %s", err)
485 return
486 }
487 defer rows.Close()
488
489 thumblock.Lock()
490 defer thumblock.Unlock()
491 thumbbiters = make(map[int64]map[string]bool)
492 zordses = make(map[int64][]*regexp.Regexp)
493 for rows.Next() {
494 var userid int64
495 var name, wherefore string
496 err = rows.Scan(&userid, &name, &wherefore)
497 if err != nil {
498 log.Printf("error scanning zonker: %s", err)
499 continue
500 }
501 if wherefore == "zord" {
502 zord := "\\b(?i:" + name + ")\\b"
503 re, err := regexp.Compile(zord)
504 if err != nil {
505 log.Printf("error compiling zord: %s", err)
506 } else {
507 zordses[userid] = append(zordses[userid], re)
508 }
509 continue
510 }
511 m := thumbbiters[userid]
512 if m == nil {
513 m = make(map[string]bool)
514 thumbbiters[userid] = m
515 }
516 m[name] = true
517 }
518}
519
520func getzords(userid int64) []*regexp.Regexp {
521 thumblock.Lock()
522 defer thumblock.Unlock()
523 return zordses[userid]
524}
525
526func thoudostbitethythumb(userid int64, who []string, objid string) bool {
527 thumblock.Lock()
528 biters := thumbbiters[userid]
529 thumblock.Unlock()
530 for _, w := range who {
531 if biters[w] {
532 return true
533 }
534 where := originate(w)
535 if where != "" {
536 if biters[where] {
537 return true
538 }
539 }
540 }
541 return false
542}
543
544func keymatch(keyname string, actor string) string {
545 hash := strings.IndexByte(keyname, '#')
546 if hash == -1 {
547 hash = len(keyname)
548 }
549 owner := keyname[0:hash]
550 if owner == actor {
551 return originate(actor)
552 }
553 return ""
554}