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