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/sha512"
21 "fmt"
22 "html/template"
23 "io"
24 "net/http"
25 "net/url"
26 "os"
27 "regexp"
28 "strings"
29 "time"
30
31 "golang.org/x/net/html"
32 "humungus.tedunangst.com/r/webs/cache"
33 "humungus.tedunangst.com/r/webs/htfilter"
34 "humungus.tedunangst.com/r/webs/httpsig"
35 "humungus.tedunangst.com/r/webs/mz"
36 "humungus.tedunangst.com/r/webs/templates"
37)
38
39var allowedclasses = make(map[string]bool)
40
41func init() {
42 allowedclasses["kw"] = true
43 allowedclasses["bi"] = true
44 allowedclasses["st"] = true
45 allowedclasses["nm"] = true
46 allowedclasses["tp"] = true
47 allowedclasses["op"] = true
48 allowedclasses["cm"] = true
49 allowedclasses["al"] = true
50 allowedclasses["dl"] = true
51}
52
53var relingo = make(map[string]string)
54
55func loadLingo() {
56 for _, l := range []string{"honked", "bonked", "honked back", "qonked", "evented"} {
57 v := l
58 k := "lingo-" + strings.ReplaceAll(l, " ", "")
59 getconfig(k, &v)
60 relingo[l] = v
61 }
62}
63
64func reverbolate(userid int64, honks []*Honk) {
65 var user *WhatAbout
66 somenumberedusers.Get(userid, &user)
67 for _, h := range honks {
68 h.What += "ed"
69 if h.What == "tonked" {
70 h.What = "honked back"
71 h.Style += " subtle"
72 }
73 if !h.Public {
74 h.Style += " limited"
75 }
76 if h.Whofore == 1 {
77 h.Style += " atme"
78 }
79 translate(h)
80 local := false
81 if h.Whofore == 2 || h.Whofore == 3 {
82 local = true
83 }
84 if local && h.What != "bonked" {
85 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
86 }
87 h.Username, h.Handle = handles(h.Honker)
88 if !local {
89 short := shortname(userid, h.Honker)
90 if short != "" {
91 h.Username = short
92 } else {
93 h.Username = h.Handle
94 if len(h.Username) > 20 {
95 h.Username = h.Username[:20] + ".."
96 }
97 }
98 }
99 if user != nil {
100 hset := []string{}
101 if h.Honker != user.URL {
102 hset = append(hset, "@"+h.Handle)
103 }
104 if user.Options.MentionAll {
105 for _, a := range h.Audience {
106 if a == h.Honker || a == user.URL {
107 continue
108 }
109 _, hand := handles(a)
110 if hand != "" {
111 hand = "@" + hand
112 hset = append(hset, hand)
113 }
114 }
115 }
116 h.Handles = strings.Join(hset, " ")
117 }
118 if h.URL == "" {
119 h.URL = h.XID
120 }
121 if h.Oonker != "" {
122 _, h.Oondle = handles(h.Oonker)
123 }
124 h.Precis = demoji(h.Precis)
125 h.Noise = demoji(h.Noise)
126 h.Open = "open"
127 for _, m := range h.Mentions {
128 if m.Where != h.Honker && !m.IsPresent(h.Noise) {
129 h.Noise = "(" + m.Who + ")" + h.Noise
130 }
131 }
132
133 zap := make(map[string]bool)
134 {
135 var htf htfilter.Filter
136 htf.Imager = replaceimgsand(zap, false)
137 htf.SpanClasses = allowedclasses
138 htf.BaseURL, _ = url.Parse(h.XID)
139 emuxifier := func(e string) string {
140 for _, d := range h.Donks {
141 if d.Name == e {
142 zap[d.XID] = true
143 if d.Local {
144 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
145 }
146 }
147 }
148 if local && h.What != "bonked" {
149 var emu Emu
150 emucache.Get(e, &emu)
151 if emu.ID != "" {
152 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
153 }
154 }
155 return e
156 }
157 htf.FilterText = func(w io.Writer, data string) {
158 data = htfilter.EscapeText(data)
159 data = re_emus.ReplaceAllStringFunc(data, emuxifier)
160 io.WriteString(w, data)
161 }
162 p, _ := htf.String(h.Precis)
163 n, _ := htf.String(h.Noise)
164 h.Precis = string(p)
165 h.Noise = string(n)
166 }
167 j := 0
168 for i := 0; i < len(h.Donks); i++ {
169 if !zap[h.Donks[i].XID] {
170 h.Donks[j] = h.Donks[i]
171 j++
172 }
173 }
174 h.Donks = h.Donks[:j]
175 }
176
177 unsee(honks, userid)
178
179 for _, h := range honks {
180 renderflags(h)
181
182 h.HTPrecis = template.HTML(h.Precis)
183 h.HTML = template.HTML(h.Noise)
184 if redo := relingo[h.What]; redo != "" {
185 h.What = redo
186 }
187 }
188}
189
190func replaceimgsand(zap map[string]bool, absolute bool) func(node *html.Node) string {
191 return func(node *html.Node) string {
192 src := htfilter.GetAttr(node, "src")
193 alt := htfilter.GetAttr(node, "alt")
194 //title := GetAttr(node, "title")
195 if htfilter.HasClass(node, "Emoji") && alt != "" {
196 return alt
197 }
198 d := finddonk(src)
199 if d != nil {
200 zap[d.XID] = true
201 base := ""
202 if absolute {
203 base = "https://" + serverName
204 }
205 return string(templates.Sprintf(`<img alt="%s" title="%s" src="%s/d/%s">`, alt, alt, base, d.XID))
206 }
207 return string(templates.Sprintf(`<img alt="%s" src="<a href="%s">%s</a>">`, alt, src, src))
208 }
209}
210
211func translatechonk(ch *Chonk) {
212 noise := ch.Noise
213 if ch.Format == "markdown" {
214 noise = markitzero(noise)
215 }
216 var htf htfilter.Filter
217 htf.SpanClasses = allowedclasses
218 htf.BaseURL, _ = url.Parse(ch.XID)
219 ch.HTML, _ = htf.String(noise)
220}
221
222func filterchonk(ch *Chonk) {
223 translatechonk(ch)
224
225 noise := string(ch.HTML)
226
227 local := originate(ch.XID) == serverName
228
229 zap := make(map[string]bool)
230 emuxifier := func(e string) string {
231 for _, d := range ch.Donks {
232 if d.Name == e {
233 zap[d.XID] = true
234 if d.Local {
235 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
236 }
237 }
238 }
239 if local {
240 var emu Emu
241 emucache.Get(e, &emu)
242 if emu.ID != "" {
243 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
244 }
245 }
246 return e
247 }
248 noise = re_emus.ReplaceAllStringFunc(noise, emuxifier)
249 j := 0
250 for i := 0; i < len(ch.Donks); i++ {
251 if !zap[ch.Donks[i].XID] {
252 ch.Donks[j] = ch.Donks[i]
253 j++
254 }
255 }
256 ch.Donks = ch.Donks[:j]
257
258 if strings.HasPrefix(noise, "<p>") {
259 noise = noise[3:]
260 }
261 ch.HTML = template.HTML(noise)
262 if short := shortname(ch.UserID, ch.Who); short != "" {
263 ch.Handle = short
264 } else {
265 ch.Handle, _ = handles(ch.Who)
266 }
267
268}
269
270func inlineimgsfor(honk *Honk) func(node *html.Node) string {
271 return func(node *html.Node) string {
272 src := htfilter.GetAttr(node, "src")
273 alt := htfilter.GetAttr(node, "alt")
274 d := savedonk(src, "image", alt, "image", true)
275 if d != nil {
276 honk.Donks = append(honk.Donks, d)
277 }
278 dlog.Printf("inline img with src: %s", src)
279 return ""
280 }
281}
282
283func imaginate(honk *Honk) {
284 var htf htfilter.Filter
285 htf.Imager = inlineimgsfor(honk)
286 htf.BaseURL, _ = url.Parse(honk.XID)
287 htf.String(honk.Noise)
288}
289
290var re_dangerous = regexp.MustCompile("^[a-zA-Z]{2}:")
291
292func precipitate(honk *Honk) {
293 noise := honk.Noise
294 if re_dangerous.MatchString(noise) {
295 idx := strings.Index(noise, "\n")
296 if idx == -1 {
297 honk.Precis = noise
298 noise = ""
299 } else {
300 honk.Precis = noise[:idx]
301 noise = noise[idx+1:]
302 }
303 honk.Precis = markitzero(strings.TrimSpace(honk.Precis))
304 honk.Noise = noise
305 }
306}
307
308func translate(honk *Honk) {
309 if honk.Format == "html" {
310 return
311 }
312 noise := honk.Noise
313
314 var marker mz.Marker
315 marker.HashLinker = ontoreplacer
316 marker.AtLinker = attoreplacer
317 noise = strings.TrimSpace(noise)
318 noise = marker.Mark(noise)
319 honk.Noise = noise
320 honk.Onts = oneofakind(marker.HashTags)
321 honk.Mentions = bunchofgrapes(marker.Mentions)
322}
323
324func redoimages(honk *Honk) {
325 zap := make(map[string]bool)
326 {
327 var htf htfilter.Filter
328 htf.Imager = replaceimgsand(zap, true)
329 htf.SpanClasses = allowedclasses
330 p, _ := htf.String(honk.Precis)
331 n, _ := htf.String(honk.Noise)
332 honk.Precis = string(p)
333 honk.Noise = string(n)
334 }
335 j := 0
336 for i := 0; i < len(honk.Donks); i++ {
337 if !zap[honk.Donks[i].XID] {
338 honk.Donks[j] = honk.Donks[i]
339 j++
340 }
341 }
342 honk.Donks = honk.Donks[:j]
343
344 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
345 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
346}
347
348func xcelerate(b []byte) string {
349 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
350 for i, c := range b {
351 b[i] = letters[c&63]
352 }
353 s := string(b)
354 return s
355}
356
357func shortxid(xid string) string {
358 h := sha512.New512_256()
359 io.WriteString(h, xid)
360 return xcelerate(h.Sum(nil)[:20])
361}
362
363func xfiltrate() string {
364 var b [18]byte
365 rand.Read(b[:])
366 return xcelerate(b[:])
367}
368
369func grapevine(mentions []Mention) []string {
370 var s []string
371 for _, m := range mentions {
372 s = append(s, m.Where)
373 }
374 return s
375}
376
377func bunchofgrapes(m []string) []Mention {
378 var mentions []Mention
379 for i := range m {
380 where := gofish(m[i])
381 if where != "" {
382 mentions = append(mentions, Mention{Who: m[i], Where: where})
383 }
384 }
385 return mentions
386}
387
388type Emu struct {
389 ID string
390 Name string
391 Type string
392}
393
394var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
395
396var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
397 fname := ename[1 : len(ename)-1]
398 exts := []string{".png", ".gif"}
399 for _, ext := range exts {
400 _, err := os.Stat(dataDir + "/emus/" + fname + ext)
401 if err != nil {
402 continue
403 }
404 url := fmt.Sprintf("https://%s/emu/%s%s", serverName, fname, ext)
405 return Emu{ID: url, Name: ename, Type: "image/" + ext[1:]}, true
406 }
407 return Emu{Name: ename, ID: "", Type: "image/png"}, true
408}, Duration: 10 * time.Second})
409
410func herdofemus(noise string) []Emu {
411 m := re_emus.FindAllString(noise, -1)
412 m = oneofakind(m)
413 var emus []Emu
414 for _, e := range m {
415 var emu Emu
416 emucache.Get(e, &emu)
417 if emu.ID == "" {
418 continue
419 }
420 emus = append(emus, emu)
421 }
422 return emus
423}
424
425var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
426var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
427var re_banner = regexp.MustCompile("banner: ?([^\n]+)")
428var re_convoy = regexp.MustCompile("convoy: ?([^\n]+)")
429var re_convalidate = regexp.MustCompile("^(https?|tag|data):")
430
431func memetize(honk *Honk) {
432 repl := func(x string) string {
433 name := x[5:]
434 if name[0] == ' ' {
435 name = name[1:]
436 }
437 fd, err := os.Open(dataDir + "/memes/" + name)
438 if err != nil {
439 ilog.Printf("no meme for %s", name)
440 return x
441 }
442 var peek [512]byte
443 n, _ := fd.Read(peek[:])
444 ct := http.DetectContentType(peek[:n])
445 fd.Close()
446
447 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
448 fileid, err := savefile(name, name, url, ct, false, nil)
449 if err != nil {
450 elog.Printf("error saving meme: %s", err)
451 return x
452 }
453 d := &Donk{
454 FileID: fileid,
455 Name: name,
456 Media: ct,
457 URL: url,
458 Local: false,
459 }
460 honk.Donks = append(honk.Donks, d)
461 return ""
462 }
463 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
464}
465
466var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n.,']|$)")
467
468func quickrename(s string, userid int64) string {
469 nonstop := true
470 for nonstop {
471 nonstop = false
472 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
473 prefix := ""
474 if m[0] == ' ' || m[0] == '\n' {
475 prefix = m[:1]
476 m = m[1:]
477 }
478 prefix += "@"
479 m = m[1:]
480 tail := ""
481 if last := m[len(m)-1]; last == ' ' || last == '\n' ||
482 last == '.' || last == ',' || last == '\'' {
483 tail = m[len(m)-1:]
484 m = m[:len(m)-1]
485 }
486
487 xid := fullname(m, userid)
488
489 if xid != "" {
490 _, name := handles(xid)
491 if name != "" {
492 nonstop = true
493 m = name
494 }
495 }
496 return prefix + m + tail
497 })
498 }
499 return s
500}
501
502var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
503 honkers := gethonkers(userid)
504 m := make(map[string]string)
505 for _, h := range honkers {
506 m[h.XID] = h.Name
507 }
508 return m, true
509}, Invalidator: &honkerinvalidator})
510
511func shortname(userid int64, xid string) string {
512 var m map[string]string
513 ok := shortnames.Get(userid, &m)
514 if ok {
515 return m[xid]
516 }
517 return ""
518}
519
520var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
521 honkers := gethonkers(userid)
522 m := make(map[string]string)
523 for _, h := range honkers {
524 m[h.Name] = h.XID
525 }
526 return m, true
527}, Invalidator: &honkerinvalidator})
528
529func fullname(name string, userid int64) string {
530 var m map[string]string
531 ok := fullnames.Get(userid, &m)
532 if ok {
533 return m[name]
534 }
535 return ""
536}
537
538func attoreplacer(m string) string {
539 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
540 where := gofish(m)
541 if where == "" {
542 return m
543 }
544 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
545 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
546}
547
548func ontoreplacer(h string) string {
549 return fmt.Sprintf(`<a href="https://%s/o/%s">%s</a>`, serverName,
550 strings.ToLower(h[1:]), h)
551}
552
553var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
554var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
555
556func originate(u string) string {
557 m := re_urlhost.FindStringSubmatch(u)
558 if len(m) > 1 {
559 return m[1]
560 }
561 return ""
562}
563
564var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
565 handle := getxonker(xid, "handle")
566 if handle == "" {
567 dlog.Printf("need to get a handle: %s", xid)
568 info, err := investigate(xid)
569 if err != nil {
570 m := re_unurl.FindStringSubmatch(xid)
571 if len(m) > 2 {
572 handle = m[2]
573 } else {
574 handle = xid
575 }
576 } else {
577 handle = info.Name
578 }
579 }
580 return handle, true
581}})
582
583// handle, handle@host
584func handles(xid string) (string, string) {
585 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
586 return "", ""
587 }
588 var handle string
589 allhandles.Get(xid, &handle)
590 if handle == xid {
591 return xid, xid
592 }
593 return handle, handle + "@" + originate(xid)
594}
595
596func butnottooloud(aud []string) {
597 for i, a := range aud {
598 if strings.HasSuffix(a, "/followers") {
599 aud[i] = ""
600 }
601 }
602}
603
604func loudandproud(aud []string) bool {
605 for _, a := range aud {
606 if a == thewholeworld {
607 return true
608 }
609 }
610 return false
611}
612
613func firstclass(honk *Honk) bool {
614 return honk.Audience[0] == thewholeworld
615}
616
617func oneofakind(a []string) []string {
618 seen := make(map[string]bool)
619 seen[""] = true
620 j := 0
621 for _, s := range a {
622 if !seen[s] {
623 seen[s] = true
624 a[j] = s
625 j++
626 }
627 }
628 return a[:j]
629}
630
631var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
632 var user *WhatAbout
633 ok := somenumberedusers.Get(userid, &user)
634 if !ok {
635 return nil, false
636 }
637 ki := new(KeyInfo)
638 ki.keyname = user.URL + "#key"
639 ki.seckey = user.SecKey
640 return ki, true
641}})
642
643func ziggy(userid int64) *KeyInfo {
644 var ki *KeyInfo
645 ziggies.Get(userid, &ki)
646 return ki
647}
648
649var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
650 data := getxonker(keyname, "pubkey")
651 if data == "" {
652 dlog.Printf("hitting the webs for missing pubkey: %s", keyname)
653 j, err := GetJunk(readyLuserOne, keyname)
654 if err != nil {
655 ilog.Printf("error getting %s pubkey: %s", keyname, err)
656 when := time.Now().UTC().Format(dbtimeformat)
657 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
658 return httpsig.PublicKey{}, true
659 }
660 allinjest(originate(keyname), j)
661 data = getxonker(keyname, "pubkey")
662 if data == "" {
663 ilog.Printf("key not found after ingesting")
664 when := time.Now().UTC().Format(dbtimeformat)
665 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
666 return httpsig.PublicKey{}, true
667 }
668 }
669 if data == "failed" {
670 ilog.Printf("lookup previously failed key %s", keyname)
671 return httpsig.PublicKey{}, true
672 }
673 _, key, err := httpsig.DecodeKey(data)
674 if err != nil {
675 ilog.Printf("error decoding %s pubkey: %s", keyname, err)
676 return key, true
677 }
678 return key, true
679}, Limit: 512})
680
681func zaggy(keyname string) (httpsig.PublicKey, error) {
682 var key httpsig.PublicKey
683 zaggies.Get(keyname, &key)
684 return key, nil
685}
686
687func savingthrow(keyname string) {
688 when := time.Now().Add(-30 * time.Minute).UTC().Format(dbtimeformat)
689 stmtDeleteXonker.Exec(keyname, "pubkey", when)
690 zaggies.Clear(keyname)
691}
692
693func keymatch(keyname string, actor string) string {
694 hash := strings.IndexByte(keyname, '#')
695 if hash == -1 {
696 hash = len(keyname)
697 }
698 owner := keyname[0:hash]
699 if owner == actor {
700 return originate(actor)
701 }
702 return ""
703}