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