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 == "honked" && h.RID != "" {
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_retag.ReplaceAllString(h.Noise, "")
86 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
87 }
88 h.Username, h.Handle = handles(h.Honker)
89 if !local {
90 short := shortname(userid, h.Honker)
91 if short != "" {
92 h.Username = short
93 } else {
94 h.Username = h.Handle
95 if len(h.Username) > 20 {
96 h.Username = h.Username[:20] + ".."
97 }
98 }
99 }
100 if user != nil {
101 hset := []string{}
102 if h.Honker != user.URL {
103 hset = append(hset, "@"+h.Handle)
104 }
105 if user.Options.MentionAll {
106 for _, a := range h.Audience {
107 if a == h.Honker || a == user.URL {
108 continue
109 }
110 _, hand := handles(a)
111 if hand != "" {
112 hand = "@" + hand
113 hset = append(hset, hand)
114 }
115 }
116 }
117 h.Handles = strings.Join(hset, " ")
118 }
119 if h.URL == "" {
120 h.URL = h.XID
121 }
122 if h.Oonker != "" {
123 _, h.Oondle = handles(h.Oonker)
124 }
125 h.Precis = demoji(h.Precis)
126 h.Noise = demoji(h.Noise)
127 h.Open = "open"
128 var misto string
129 for _, m := range h.Mentions {
130 if m.Where != h.Honker && !m.IsPresent(h.Noise) {
131 misto += " " + m.Who
132 }
133 }
134 var mistag string
135 for _, o := range h.Onts {
136 if !OntIsPresent(o, h.Noise) {
137 mistag += " " + o
138 }
139 }
140 if len(misto) > 0 || len(mistag) > 0 {
141 if len(misto) > 0 {
142 misto = "(" + misto[1:] + ")<p>"
143 }
144 if len(mistag) > 0 {
145 mistag = "<p>(" + mistag[1:] + ")"
146 }
147 h.Noise = misto + h.Noise + mistag
148 }
149
150 zap := make(map[string]bool)
151 {
152 var htf htfilter.Filter
153 htf.Imager = replaceimgsand(zap, false)
154 htf.SpanClasses = allowedclasses
155 htf.BaseURL, _ = url.Parse(h.XID)
156 emuxifier := func(e string) string {
157 for _, d := range h.Donks {
158 if d.Name == e {
159 zap[d.XID] = true
160 if d.Local {
161 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
162 }
163 }
164 }
165 if local && h.What != "bonked" {
166 var emu Emu
167 emucache.Get(e, &emu)
168 if emu.ID != "" {
169 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
170 }
171 }
172 return e
173 }
174 htf.FilterText = func(w io.Writer, data string) {
175 data = htfilter.EscapeText(data)
176 data = re_emus.ReplaceAllStringFunc(data, emuxifier)
177 io.WriteString(w, data)
178 }
179 if user != nil {
180 htf.RetargetLink = func(href string) string {
181 for _, m := range h.Mentions {
182 if href == m.Where {
183 return "/h?xid=" + url.QueryEscape(href)
184 }
185 }
186 return href
187 }
188 }
189 p, _ := htf.String(h.Precis)
190 n, _ := htf.String(h.Noise)
191 h.Precis = string(p)
192 h.Noise = string(n)
193 }
194 j := 0
195 for i := 0; i < len(h.Donks); i++ {
196 if !zap[h.Donks[i].XID] {
197 h.Donks[j] = h.Donks[i]
198 j++
199 }
200 }
201 h.Donks = h.Donks[:j]
202 }
203
204 unsee(honks, userid)
205
206 for _, h := range honks {
207 renderflags(h)
208
209 h.HTPrecis = template.HTML(h.Precis)
210 h.HTML = template.HTML(h.Noise)
211 if redo := relingo[h.What]; redo != "" {
212 h.What = redo
213 }
214 }
215}
216
217func replaceimgsand(zap map[string]bool, absolute bool) func(node *html.Node) string {
218 return func(node *html.Node) string {
219 src := htfilter.GetAttr(node, "src")
220 alt := htfilter.GetAttr(node, "alt")
221 //title := GetAttr(node, "title")
222 if htfilter.HasClass(node, "Emoji") && alt != "" {
223 return alt
224 }
225 d := finddonk(src)
226 if d != nil {
227 zap[d.XID] = true
228 base := ""
229 if absolute {
230 base = "https://" + serverName
231 }
232 return string(templates.Sprintf(`<img alt="%s" title="%s" src="%s/d/%s">`, alt, alt, base, d.XID))
233 }
234 return string(templates.Sprintf(`<img alt="%s" src="<a href="%s">%s</a>">`, alt, src, src))
235 }
236}
237
238func translatechonk(ch *Chonk) {
239 noise := ch.Noise
240 if ch.Format == "markdown" {
241 var marker mz.Marker
242 noise = marker.Mark(noise)
243 }
244 var htf htfilter.Filter
245 htf.SpanClasses = allowedclasses
246 htf.BaseURL, _ = url.Parse(ch.XID)
247 ch.HTML, _ = htf.String(noise)
248}
249
250func filterchonk(ch *Chonk) {
251 translatechonk(ch)
252
253 noise := string(ch.HTML)
254
255 local := originate(ch.XID) == serverName
256
257 zap := make(map[string]bool)
258 emuxifier := func(e string) string {
259 for _, d := range ch.Donks {
260 if d.Name == e {
261 zap[d.XID] = true
262 if d.Local {
263 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
264 }
265 }
266 }
267 if local {
268 var emu Emu
269 emucache.Get(e, &emu)
270 if emu.ID != "" {
271 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
272 }
273 }
274 return e
275 }
276 noise = re_emus.ReplaceAllStringFunc(noise, emuxifier)
277 j := 0
278 for i := 0; i < len(ch.Donks); i++ {
279 if !zap[ch.Donks[i].XID] {
280 ch.Donks[j] = ch.Donks[i]
281 j++
282 }
283 }
284 ch.Donks = ch.Donks[:j]
285
286 if strings.HasPrefix(noise, "<p>") {
287 noise = noise[3:]
288 }
289 ch.HTML = template.HTML(noise)
290 if short := shortname(ch.UserID, ch.Who); short != "" {
291 ch.Handle = short
292 } else {
293 ch.Handle, _ = handles(ch.Who)
294 }
295
296}
297
298func inlineimgsfor(honk *Honk) func(node *html.Node) string {
299 return func(node *html.Node) string {
300 src := htfilter.GetAttr(node, "src")
301 alt := htfilter.GetAttr(node, "alt")
302 d := savedonk(src, "image", alt, "image", true)
303 if d != nil {
304 honk.Donks = append(honk.Donks, d)
305 }
306 dlog.Printf("inline img with src: %s", src)
307 return ""
308 }
309}
310
311func imaginate(honk *Honk) {
312 var htf htfilter.Filter
313 htf.Imager = inlineimgsfor(honk)
314 htf.BaseURL, _ = url.Parse(honk.XID)
315 htf.String(honk.Noise)
316}
317
318var re_dangerous = regexp.MustCompile("^[a-zA-Z]{2}:")
319
320func precipitate(honk *Honk) {
321 noise := honk.Noise
322 if re_dangerous.MatchString(noise) {
323 idx := strings.Index(noise, "\n")
324 if idx == -1 {
325 honk.Precis = noise
326 noise = ""
327 } else {
328 honk.Precis = noise[:idx]
329 noise = noise[idx+1:]
330 }
331 var marker mz.Marker
332 honk.Precis = marker.Mark(strings.TrimSpace(honk.Precis))
333 honk.Noise = noise
334 }
335}
336
337func translate(honk *Honk) {
338 if honk.Format == "html" {
339 return
340 }
341 noise := honk.Noise
342
343 var marker mz.Marker
344 marker.HashLinker = ontoreplacer
345 marker.AtLinker = attoreplacer
346 noise = strings.TrimSpace(noise)
347 noise = marker.Mark(noise)
348 honk.Noise = noise
349 honk.Onts = oneofakind(append(honk.Onts, marker.HashTags...))
350 honk.Mentions = bunchofgrapes(marker.Mentions)
351}
352
353func redoimages(honk *Honk) {
354 zap := make(map[string]bool)
355 {
356 var htf htfilter.Filter
357 htf.Imager = replaceimgsand(zap, true)
358 htf.SpanClasses = allowedclasses
359 p, _ := htf.String(honk.Precis)
360 n, _ := htf.String(honk.Noise)
361 honk.Precis = string(p)
362 honk.Noise = string(n)
363 }
364 j := 0
365 for i := 0; i < len(honk.Donks); i++ {
366 if !zap[honk.Donks[i].XID] {
367 honk.Donks[j] = honk.Donks[i]
368 j++
369 }
370 }
371 honk.Donks = honk.Donks[:j]
372
373 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
374 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
375}
376
377func xcelerate(b []byte) string {
378 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
379 for i, c := range b {
380 b[i] = letters[c&63]
381 }
382 s := string(b)
383 return s
384}
385
386func shortxid(xid string) string {
387 h := sha512.New512_256()
388 io.WriteString(h, xid)
389 return xcelerate(h.Sum(nil)[:20])
390}
391
392func xfiltrate() string {
393 var b [18]byte
394 rand.Read(b[:])
395 return xcelerate(b[:])
396}
397
398func grapevine(mentions []Mention) []string {
399 var s []string
400 for _, m := range mentions {
401 s = append(s, m.Where)
402 }
403 return s
404}
405
406func bunchofgrapes(m []string) []Mention {
407 var mentions []Mention
408 for i := range m {
409 where := gofish(m[i])
410 if where != "" {
411 mentions = append(mentions, Mention{Who: m[i], Where: where})
412 }
413 }
414 return mentions
415}
416
417type Emu struct {
418 ID string
419 Name string
420 Type string
421}
422
423var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
424
425var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
426 fname := ename[1 : len(ename)-1]
427 exts := []string{".png", ".gif"}
428 for _, ext := range exts {
429 _, err := os.Stat(dataDir + "/emus/" + fname + ext)
430 if err != nil {
431 continue
432 }
433 url := fmt.Sprintf("https://%s/emu/%s%s", serverName, fname, ext)
434 return Emu{ID: url, Name: ename, Type: "image/" + ext[1:]}, true
435 }
436 return Emu{Name: ename, ID: "", Type: "image/png"}, true
437}, Duration: 10 * time.Second})
438
439func herdofemus(noise string) []Emu {
440 m := re_emus.FindAllString(noise, -1)
441 m = oneofakind(m)
442 var emus []Emu
443 for _, e := range m {
444 var emu Emu
445 emucache.Get(e, &emu)
446 if emu.ID == "" {
447 continue
448 }
449 emus = append(emus, emu)
450 }
451 return emus
452}
453
454var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
455var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
456var re_banner = regexp.MustCompile("banner: ?([^\n]+)")
457var re_convoy = regexp.MustCompile("convoy: ?([^\n]+)")
458var re_retag = regexp.MustCompile("tags: ?([^\n]+)")
459var re_convalidate = regexp.MustCompile("^(https?|tag|data):")
460
461func memetize(honk *Honk) {
462 repl := func(x string) string {
463 name := x[5:]
464 if name[0] == ' ' {
465 name = name[1:]
466 }
467 fd, err := os.Open(dataDir + "/memes/" + name)
468 if err != nil {
469 ilog.Printf("no meme for %s", name)
470 return x
471 }
472 var peek [512]byte
473 n, _ := fd.Read(peek[:])
474 ct := http.DetectContentType(peek[:n])
475 fd.Close()
476
477 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
478 fileid, err := savefile(name, name, url, ct, false, nil)
479 if err != nil {
480 elog.Printf("error saving meme: %s", err)
481 return x
482 }
483 d := &Donk{
484 FileID: fileid,
485 Name: name,
486 Media: ct,
487 URL: url,
488 Local: false,
489 }
490 honk.Donks = append(honk.Donks, d)
491 return ""
492 }
493 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
494}
495
496func recategorize(honk *Honk) {
497 repl := func(x string) string {
498 x = x[5:]
499 for _, t := range strings.Split(x, " ") {
500 if t == "" {
501 continue
502 }
503 if t[0] != '#' {
504 t = "#" + t
505 }
506 dlog.Printf("hashtag: %s", t)
507 honk.Onts = append(honk.Onts, t)
508 }
509 return ""
510 }
511 honk.Noise = re_retag.ReplaceAllStringFunc(honk.Noise, repl)
512}
513
514var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]_]+([ \n:;.,']|$)")
515
516func quickrename(s string, userid int64) string {
517 nonstop := true
518 for nonstop {
519 nonstop = false
520 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
521 prefix := ""
522 if m[0] == ' ' || m[0] == '\n' {
523 prefix = m[:1]
524 m = m[1:]
525 }
526 prefix += "@"
527 m = m[1:]
528 tail := ""
529 if last := m[len(m)-1]; last == ' ' || last == '\n' ||
530 last == ':' || last == ';' ||
531 last == '.' || last == ',' || last == '\'' {
532 tail = m[len(m)-1:]
533 m = m[:len(m)-1]
534 }
535
536 xid := fullname(m, userid)
537
538 if xid != "" {
539 _, name := handles(xid)
540 if name != "" {
541 nonstop = true
542 m = name
543 }
544 }
545 return prefix + m + tail
546 })
547 }
548 return s
549}
550
551var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
552 honkers := gethonkers(userid)
553 m := make(map[string]string)
554 for _, h := range honkers {
555 m[h.XID] = h.Name
556 }
557 return m, true
558}, Invalidator: &honkerinvalidator})
559
560func shortname(userid int64, xid string) string {
561 var m map[string]string
562 ok := shortnames.Get(userid, &m)
563 if ok {
564 return m[xid]
565 }
566 return ""
567}
568
569var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
570 honkers := gethonkers(userid)
571 m := make(map[string]string)
572 for _, h := range honkers {
573 m[h.Name] = h.XID
574 }
575 return m, true
576}, Invalidator: &honkerinvalidator})
577
578func fullname(name string, userid int64) string {
579 var m map[string]string
580 ok := fullnames.Get(userid, &m)
581 if ok {
582 return m[name]
583 }
584 return ""
585}
586
587func attoreplacer(m string) string {
588 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
589 where := gofish(m)
590 if where == "" {
591 return m
592 }
593 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
594 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
595}
596
597func ontoreplacer(h string) string {
598 return fmt.Sprintf(`<a class="mention hashtag" href="https://%s/o/%s">%s</a>`, serverName,
599 strings.ToLower(h[1:]), h)
600}
601
602var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
603var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
604
605func originate(u string) string {
606 m := re_urlhost.FindStringSubmatch(u)
607 if len(m) > 1 {
608 return m[1]
609 }
610 return ""
611}
612
613var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
614 handle := getxonker(xid, "handle")
615 if handle == "" {
616 dlog.Printf("need to get a handle: %s", xid)
617 info, err := investigate(xid)
618 if err != nil {
619 m := re_unurl.FindStringSubmatch(xid)
620 if len(m) > 2 {
621 handle = m[2]
622 } else {
623 handle = xid
624 }
625 } else {
626 handle = info.Name
627 }
628 }
629 return handle, true
630}})
631
632// handle, handle@host
633func handles(xid string) (string, string) {
634 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
635 return "", ""
636 }
637 var handle string
638 allhandles.Get(xid, &handle)
639 if handle == xid {
640 return xid, xid
641 }
642 return handle, handle + "@" + originate(xid)
643}
644
645func butnottooloud(aud []string) {
646 for i, a := range aud {
647 if strings.HasSuffix(a, "/followers") {
648 aud[i] = ""
649 }
650 }
651}
652
653func loudandproud(aud []string) bool {
654 for _, a := range aud {
655 if a == thewholeworld {
656 return true
657 }
658 }
659 return false
660}
661
662func firstclass(honk *Honk) bool {
663 return honk.Audience[0] == thewholeworld
664}
665
666func oneofakind(a []string) []string {
667 seen := make(map[string]bool)
668 seen[""] = true
669 j := 0
670 for _, s := range a {
671 if !seen[s] {
672 seen[s] = true
673 a[j] = s
674 j++
675 }
676 }
677 return a[:j]
678}
679
680var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
681 var user *WhatAbout
682 ok := somenumberedusers.Get(userid, &user)
683 if !ok {
684 return nil, false
685 }
686 ki := new(KeyInfo)
687 ki.keyname = user.URL + "#key"
688 ki.seckey = user.SecKey
689 return ki, true
690}})
691
692func ziggy(userid int64) *KeyInfo {
693 var ki *KeyInfo
694 ziggies.Get(userid, &ki)
695 return ki
696}
697
698var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
699 data := getxonker(keyname, "pubkey")
700 if data == "" {
701 dlog.Printf("hitting the webs for missing pubkey: %s", keyname)
702 j, err := GetJunk(readyLuserOne, keyname)
703 if err != nil {
704 ilog.Printf("error getting %s pubkey: %s", keyname, err)
705 when := time.Now().UTC().Format(dbtimeformat)
706 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
707 return httpsig.PublicKey{}, true
708 }
709 allinjest(originate(keyname), j)
710 data = getxonker(keyname, "pubkey")
711 if data == "" {
712 ilog.Printf("key not found after ingesting")
713 when := time.Now().UTC().Format(dbtimeformat)
714 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
715 return httpsig.PublicKey{}, true
716 }
717 }
718 if data == "failed" {
719 ilog.Printf("lookup previously failed key %s", keyname)
720 return httpsig.PublicKey{}, true
721 }
722 _, key, err := httpsig.DecodeKey(data)
723 if err != nil {
724 ilog.Printf("error decoding %s pubkey: %s", keyname, err)
725 return key, true
726 }
727 return key, true
728}, Limit: 512})
729
730func zaggy(keyname string) (httpsig.PublicKey, error) {
731 var key httpsig.PublicKey
732 zaggies.Get(keyname, &key)
733 return key, nil
734}
735
736func savingthrow(keyname string) {
737 when := time.Now().Add(-30 * time.Minute).UTC().Format(dbtimeformat)
738 stmtDeleteXonker.Exec(keyname, "pubkey", when)
739 zaggies.Clear(keyname)
740}
741
742func keymatch(keyname string, actor string) string {
743 origin := originate(actor)
744 if origin == originate(keyname) {
745 return origin
746 }
747 return ""
748}