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