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 h2 := strings.ReplaceAll(href, "/@", "/users/")
182 for _, m := range h.Mentions {
183 if h2 == m.Where || href == m.Where {
184 return "/h?xid=" + url.QueryEscape(m.Where)
185 }
186 }
187 return href
188 }
189 }
190 p, _ := htf.String(h.Precis)
191 n, _ := htf.String(h.Noise)
192 h.Precis = string(p)
193 h.Noise = string(n)
194 }
195 j := 0
196 for i := 0; i < len(h.Donks); i++ {
197 if !zap[h.Donks[i].XID] {
198 h.Donks[j] = h.Donks[i]
199 j++
200 }
201 }
202 h.Donks = h.Donks[:j]
203 }
204
205 unsee(honks, userid)
206
207 for _, h := range honks {
208 renderflags(h)
209
210 h.HTPrecis = template.HTML(h.Precis)
211 h.HTML = template.HTML(h.Noise)
212 if redo := relingo[h.What]; redo != "" {
213 h.What = redo
214 }
215 }
216}
217
218func replaceimgsand(zap map[string]bool, absolute bool) func(node *html.Node) string {
219 return func(node *html.Node) string {
220 src := htfilter.GetAttr(node, "src")
221 alt := htfilter.GetAttr(node, "alt")
222 //title := GetAttr(node, "title")
223 if htfilter.HasClass(node, "Emoji") && alt != "" {
224 return alt
225 }
226 d := finddonk(src)
227 if d != nil {
228 zap[d.XID] = true
229 base := ""
230 if absolute {
231 base = "https://" + serverName
232 }
233 return string(templates.Sprintf(`<img alt="%s" title="%s" src="%s/d/%s">`, alt, alt, base, d.XID))
234 }
235 return string(templates.Sprintf(`<img alt="%s" src="<a href="%s">%s</a>">`, alt, src, src))
236 }
237}
238
239func translatechonk(ch *Chonk) {
240 noise := ch.Noise
241 if ch.Format == "markdown" {
242 var marker mz.Marker
243 noise = marker.Mark(noise)
244 }
245 var htf htfilter.Filter
246 htf.SpanClasses = allowedclasses
247 htf.BaseURL, _ = url.Parse(ch.XID)
248 ch.HTML, _ = htf.String(noise)
249}
250
251func filterchonk(ch *Chonk) {
252 translatechonk(ch)
253
254 noise := string(ch.HTML)
255
256 local := originate(ch.XID) == serverName
257
258 zap := make(map[string]bool)
259 emuxifier := func(e string) string {
260 for _, d := range ch.Donks {
261 if d.Name == e {
262 zap[d.XID] = true
263 if d.Local {
264 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
265 }
266 }
267 }
268 if local {
269 var emu Emu
270 emucache.Get(e, &emu)
271 if emu.ID != "" {
272 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
273 }
274 }
275 return e
276 }
277 noise = re_emus.ReplaceAllStringFunc(noise, emuxifier)
278 j := 0
279 for i := 0; i < len(ch.Donks); i++ {
280 if !zap[ch.Donks[i].XID] {
281 ch.Donks[j] = ch.Donks[i]
282 j++
283 }
284 }
285 ch.Donks = ch.Donks[:j]
286
287 if strings.HasPrefix(noise, "<p>") {
288 noise = noise[3:]
289 }
290 ch.HTML = template.HTML(noise)
291 if short := shortname(ch.UserID, ch.Who); short != "" {
292 ch.Handle = short
293 } else {
294 ch.Handle, _ = handles(ch.Who)
295 }
296
297}
298
299func inlineimgsfor(honk *Honk) func(node *html.Node) string {
300 return func(node *html.Node) string {
301 src := htfilter.GetAttr(node, "src")
302 alt := htfilter.GetAttr(node, "alt")
303 d := savedonk(src, "image", alt, "image", true)
304 if d != nil {
305 honk.Donks = append(honk.Donks, d)
306 }
307 dlog.Printf("inline img with src: %s", src)
308 return ""
309 }
310}
311
312func imaginate(honk *Honk) {
313 var htf htfilter.Filter
314 htf.Imager = inlineimgsfor(honk)
315 htf.BaseURL, _ = url.Parse(honk.XID)
316 htf.String(honk.Noise)
317}
318
319var re_dangerous = regexp.MustCompile("^[a-zA-Z]{2}:")
320
321func precipitate(honk *Honk) {
322 noise := honk.Noise
323 if re_dangerous.MatchString(noise) {
324 idx := strings.Index(noise, "\n")
325 if idx == -1 {
326 honk.Precis = noise
327 noise = ""
328 } else {
329 honk.Precis = noise[:idx]
330 noise = noise[idx+1:]
331 }
332 var marker mz.Marker
333 marker.Short = true
334 honk.Precis = marker.Mark(strings.TrimSpace(honk.Precis))
335 honk.Noise = noise
336 }
337}
338
339func translate(honk *Honk) {
340 if honk.Format == "html" {
341 return
342 }
343 noise := honk.Noise
344
345 var marker mz.Marker
346 marker.HashLinker = ontoreplacer
347 marker.AtLinker = attoreplacer
348 marker.AllowImages = true
349 noise = strings.TrimSpace(noise)
350 noise = marker.Mark(noise)
351 honk.Noise = noise
352 honk.Onts = oneofakind(append(honk.Onts, marker.HashTags...))
353 honk.Mentions = bunchofgrapes(marker.Mentions)
354}
355
356func redoimages(honk *Honk) {
357 zap := make(map[string]bool)
358 {
359 var htf htfilter.Filter
360 htf.Imager = replaceimgsand(zap, true)
361 htf.SpanClasses = allowedclasses
362 p, _ := htf.String(honk.Precis)
363 n, _ := htf.String(honk.Noise)
364 honk.Precis = string(p)
365 honk.Noise = string(n)
366 }
367 j := 0
368 for i := 0; i < len(honk.Donks); i++ {
369 if !zap[honk.Donks[i].XID] {
370 honk.Donks[j] = honk.Donks[i]
371 j++
372 }
373 }
374 honk.Donks = honk.Donks[:j]
375
376 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
377 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
378}
379
380func xcelerate(b []byte) string {
381 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
382 for i, c := range b {
383 b[i] = letters[c&63]
384 }
385 s := string(b)
386 return s
387}
388
389func shortxid(xid string) string {
390 h := sha512.New512_256()
391 io.WriteString(h, xid)
392 return xcelerate(h.Sum(nil)[:20])
393}
394
395func xfiltrate() string {
396 var b [18]byte
397 rand.Read(b[:])
398 return xcelerate(b[:])
399}
400
401func grapevine(mentions []Mention) []string {
402 var s []string
403 for _, m := range mentions {
404 s = append(s, m.Where)
405 }
406 return s
407}
408
409func bunchofgrapes(m []string) []Mention {
410 var mentions []Mention
411 for i := range m {
412 where := gofish(m[i])
413 if where != "" {
414 mentions = append(mentions, Mention{Who: m[i], Where: where})
415 }
416 }
417 return mentions
418}
419
420type Emu struct {
421 ID string
422 Name string
423 Type string
424}
425
426var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
427
428var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
429 fname := ename[1 : len(ename)-1]
430 exts := []string{".png", ".gif"}
431 for _, ext := range exts {
432 _, err := os.Stat(dataDir + "/emus/" + fname + ext)
433 if err != nil {
434 continue
435 }
436 url := fmt.Sprintf("https://%s/emu/%s%s", serverName, fname, ext)
437 if develMode {
438 url = fmt.Sprintf("/emu/%s%s", fname, ext)
439 }
440 return Emu{ID: url, Name: ename, Type: "image/" + ext[1:]}, true
441 }
442 return Emu{Name: ename, ID: "", Type: "image/png"}, true
443}, Duration: 10 * time.Second})
444
445func herdofemus(noise string) []Emu {
446 m := re_emus.FindAllString(noise, -1)
447 m = oneofakind(m)
448 var emus []Emu
449 for _, e := range m {
450 var emu Emu
451 emucache.Get(e, &emu)
452 if emu.ID == "" {
453 continue
454 }
455 emus = append(emus, emu)
456 }
457 return emus
458}
459
460var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
461var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
462var re_banner = regexp.MustCompile("banner: ?([^\n]+)")
463var re_convoy = regexp.MustCompile("convoy: ?([^\n]+)")
464var re_retag = regexp.MustCompile("tags: ?([^\n]+)")
465var re_convalidate = regexp.MustCompile("^(https?|tag|data):")
466
467func memetize(honk *Honk) {
468 repl := func(x string) string {
469 name := x[5:]
470 if name[0] == ' ' {
471 name = name[1:]
472 }
473 fd, err := os.Open(dataDir + "/memes/" + name)
474 if err != nil {
475 ilog.Printf("no meme for %s", name)
476 return x
477 }
478 var peek [512]byte
479 n, _ := fd.Read(peek[:])
480 ct := http.DetectContentType(peek[:n])
481 fd.Close()
482
483 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
484 fileid, err := savefile(name, name, url, ct, false, nil)
485 if err != nil {
486 elog.Printf("error saving meme: %s", err)
487 return x
488 }
489 d := &Donk{
490 FileID: fileid,
491 Name: name,
492 Media: ct,
493 URL: url,
494 Local: false,
495 }
496 honk.Donks = append(honk.Donks, d)
497 return ""
498 }
499 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
500}
501
502func recategorize(honk *Honk) {
503 repl := func(x string) string {
504 x = x[5:]
505 for _, t := range strings.Split(x, " ") {
506 if t == "" {
507 continue
508 }
509 if t[0] != '#' {
510 t = "#" + t
511 }
512 dlog.Printf("hashtag: %s", t)
513 honk.Onts = append(honk.Onts, t)
514 }
515 return ""
516 }
517 honk.Noise = re_retag.ReplaceAllStringFunc(honk.Noise, repl)
518}
519
520var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]_]+([ \n:;.,']|$)")
521
522func quickrename(s string, userid int64) string {
523 nonstop := true
524 for nonstop {
525 nonstop = false
526 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
527 prefix := ""
528 if m[0] == ' ' || m[0] == '\n' {
529 prefix = m[:1]
530 m = m[1:]
531 }
532 prefix += "@"
533 m = m[1:]
534 tail := ""
535 if last := m[len(m)-1]; last == ' ' || last == '\n' ||
536 last == ':' || last == ';' ||
537 last == '.' || last == ',' || last == '\'' {
538 tail = m[len(m)-1:]
539 m = m[:len(m)-1]
540 }
541
542 xid := fullname(m, userid)
543
544 if xid != "" {
545 _, name := handles(xid)
546 if name != "" {
547 nonstop = true
548 m = name
549 }
550 }
551 return prefix + m + tail
552 })
553 }
554 return s
555}
556
557var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
558 honkers := gethonkers(userid)
559 m := make(map[string]string)
560 for _, h := range honkers {
561 m[h.XID] = h.Name
562 }
563 return m, true
564}, Invalidator: &honkerinvalidator})
565
566func shortname(userid int64, xid string) string {
567 var m map[string]string
568 ok := shortnames.Get(userid, &m)
569 if ok {
570 return m[xid]
571 }
572 return ""
573}
574
575var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
576 honkers := gethonkers(userid)
577 m := make(map[string]string)
578 for _, h := range honkers {
579 m[h.Name] = h.XID
580 }
581 return m, true
582}, Invalidator: &honkerinvalidator})
583
584func fullname(name string, userid int64) string {
585 var m map[string]string
586 ok := fullnames.Get(userid, &m)
587 if ok {
588 return m[name]
589 }
590 return ""
591}
592
593func attoreplacer(m string) string {
594 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
595 where := gofish(m)
596 if where == "" {
597 return m
598 }
599 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
600 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
601}
602
603func ontoreplacer(h string) string {
604 return fmt.Sprintf(`<a class="mention hashtag" href="https://%s/o/%s">%s</a>`, serverName,
605 strings.ToLower(h[1:]), h)
606}
607
608var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
609var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
610
611func originate(u string) string {
612 m := re_urlhost.FindStringSubmatch(u)
613 if len(m) > 1 {
614 return m[1]
615 }
616 return ""
617}
618
619var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
620 handle := getxonker(xid, "handle")
621 if handle == "" {
622 dlog.Printf("need to get a handle: %s", xid)
623 info, err := investigate(xid)
624 if err != nil {
625 m := re_unurl.FindStringSubmatch(xid)
626 if len(m) > 2 {
627 handle = m[2]
628 } else {
629 handle = xid
630 }
631 } else {
632 handle = info.Name
633 }
634 }
635 return handle, true
636}})
637
638// handle, handle@host
639func handles(xid string) (string, string) {
640 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
641 return "", ""
642 }
643 var handle string
644 allhandles.Get(xid, &handle)
645 if handle == xid {
646 return xid, xid
647 }
648 return handle, handle + "@" + originate(xid)
649}
650
651func butnottooloud(aud []string) {
652 for i, a := range aud {
653 if strings.HasSuffix(a, "/followers") {
654 aud[i] = ""
655 }
656 }
657}
658
659func loudandproud(aud []string) bool {
660 for _, a := range aud {
661 if a == thewholeworld {
662 return true
663 }
664 }
665 return false
666}
667
668func firstclass(honk *Honk) bool {
669 return honk.Audience[0] == thewholeworld
670}
671
672func oneofakind(a []string) []string {
673 seen := make(map[string]bool)
674 seen[""] = true
675 j := 0
676 for _, s := range a {
677 if !seen[s] {
678 seen[s] = true
679 a[j] = s
680 j++
681 }
682 }
683 return a[:j]
684}
685
686var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
687 var user *WhatAbout
688 ok := somenumberedusers.Get(userid, &user)
689 if !ok {
690 return nil, false
691 }
692 ki := new(KeyInfo)
693 ki.keyname = user.URL + "#key"
694 ki.seckey = user.SecKey
695 return ki, true
696}})
697
698func ziggy(userid int64) *KeyInfo {
699 var ki *KeyInfo
700 ziggies.Get(userid, &ki)
701 return ki
702}
703
704var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
705 data := getxonker(keyname, "pubkey")
706 if data == "" {
707 dlog.Printf("hitting the webs for missing pubkey: %s", keyname)
708 j, err := GetJunk(readyLuserOne, keyname)
709 if err != nil {
710 ilog.Printf("error getting %s pubkey: %s", keyname, err)
711 when := time.Now().UTC().Format(dbtimeformat)
712 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
713 return httpsig.PublicKey{}, true
714 }
715 allinjest(originate(keyname), j)
716 data = getxonker(keyname, "pubkey")
717 if data == "" {
718 ilog.Printf("key not found after ingesting")
719 when := time.Now().UTC().Format(dbtimeformat)
720 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
721 return httpsig.PublicKey{}, true
722 }
723 }
724 if data == "failed" {
725 ilog.Printf("lookup previously failed key %s", keyname)
726 return httpsig.PublicKey{}, true
727 }
728 _, key, err := httpsig.DecodeKey(data)
729 if err != nil {
730 ilog.Printf("error decoding %s pubkey: %s", keyname, err)
731 return key, true
732 }
733 return key, true
734}, Limit: 512})
735
736func zaggy(keyname string) (httpsig.PublicKey, error) {
737 var key httpsig.PublicKey
738 zaggies.Get(keyname, &key)
739 return key, nil
740}
741
742func savingthrow(keyname string) {
743 when := time.Now().Add(-30 * time.Minute).UTC().Format(dbtimeformat)
744 stmtDeleteXonker.Exec(keyname, "pubkey", when)
745 zaggies.Clear(keyname)
746}
747
748func keymatch(keyname string, actor string) string {
749 origin := originate(actor)
750 if origin == originate(keyname) {
751 return origin
752 }
753 return ""
754}