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