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 "github.com/dustin/go-humanize"
32 "golang.org/x/net/html"
33 "humungus.tedunangst.com/r/webs/cache"
34 "humungus.tedunangst.com/r/webs/htfilter"
35 "humungus.tedunangst.com/r/webs/httpsig"
36 "humungus.tedunangst.com/r/webs/mz"
37 "humungus.tedunangst.com/r/webs/templates"
38)
39
40var allowedclasses = make(map[string]bool)
41
42func init() {
43 allowedclasses["kw"] = true
44 allowedclasses["bi"] = true
45 allowedclasses["st"] = true
46 allowedclasses["nm"] = true
47 allowedclasses["tp"] = true
48 allowedclasses["op"] = true
49 allowedclasses["cm"] = true
50 allowedclasses["al"] = true
51 allowedclasses["dl"] = true
52}
53
54var relingo = make(map[string]string)
55
56func loadLingo() {
57 for _, l := range []string{"honked", "bonked", "honked back", "qonked", "evented"} {
58 v := l
59 k := "lingo-" + strings.ReplaceAll(l, " ", "")
60 getconfig(k, &v)
61 relingo[l] = v
62 }
63}
64
65func prettifydate(d time.Time) string {
66 var customMags = []humanize.RelTimeMagnitude{
67 {time.Second, "now", time.Second},
68 {2 * time.Second, "1s %s", 1},
69 {time.Minute, "%ds %s", time.Second},
70 {2 * time.Minute, "1m %s", 1},
71 {time.Hour, "%dm %s", time.Minute},
72 {2 * time.Hour, "1h %s", 1},
73 {humanize.Day, "%dh %s", time.Hour},
74 {2 * humanize.Day, "1d %s", 1},
75 {humanize.Week, "%dd %s", humanize.Day},
76 {2 * humanize.Week, "1w %s", 1},
77 {humanize.Month, "%dw %s", humanize.Week},
78 }
79
80 since := time.Since(d)
81 // More than a month, return the actual date.
82 if since.Hours() > 730 {
83 return d.Format("02 Jan 2006 15:04")
84 }
85
86 return humanize.CustomRelTime(d, time.Now(), "", "from now", customMags)
87}
88
89func reverbolate(userid int64, honks []*Honk) {
90 var user *WhatAbout
91 somenumberedusers.Get(userid, &user)
92 for _, h := range honks {
93 // idk where else to put this
94 h.DatePretty = prettifydate(h.Date)
95 h.What += "ed"
96 if h.What == "honked" && h.RID != "" {
97 h.What = "honked back"
98 h.Style += " subtle"
99 }
100 if !h.Public {
101 h.Style += " limited"
102 }
103 if h.Whofore == 1 {
104 h.Style += " atme"
105 }
106 translate(h)
107 local := false
108 if h.Whofore == 2 || h.Whofore == 3 {
109 local = true
110 }
111 if local && h.What != "bonked" {
112 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
113 }
114 h.Username, h.Handle = handles(h.Honker)
115 if !local {
116 short := shortname(userid, h.Honker)
117 if short != "" {
118 h.Username = short
119 } else {
120 h.Username = h.Handle
121 if len(h.Username) > 20 {
122 h.Username = h.Username[:20] + ".."
123 }
124 }
125 }
126 if user != nil {
127 hset := []string{}
128 if h.Honker != user.URL {
129 hset = append(hset, "@"+h.Handle)
130 }
131 if user.Options.MentionAll {
132 for _, a := range h.Audience {
133 if a == h.Honker || a == user.URL {
134 continue
135 }
136 _, hand := handles(a)
137 if hand != "" {
138 hand = "@" + hand
139 hset = append(hset, hand)
140 }
141 }
142 }
143 h.Handles = strings.Join(hset, " ")
144 }
145 if h.URL == "" {
146 h.URL = h.XID
147 }
148 if h.Oonker != "" {
149 _, h.Oondle = handles(h.Oonker)
150 }
151 h.Precis = demoji(h.Precis)
152 h.Noise = demoji(h.Noise)
153 h.Open = "open"
154 for _, m := range h.Mentions {
155 if m.Where != h.Honker && !m.IsPresent(h.Noise) {
156 h.Noise = "(" + m.Who + ")" + h.Noise
157 }
158 }
159
160 zap := make(map[string]bool)
161 {
162 var htf htfilter.Filter
163 htf.Imager = replaceimgsand(zap, false)
164 htf.SpanClasses = allowedclasses
165 htf.BaseURL, _ = url.Parse(h.XID)
166 emuxifier := func(e string) string {
167 for _, d := range h.Donks {
168 if d.Name == e {
169 zap[d.XID] = true
170 if d.Local {
171 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
172 }
173 }
174 }
175 if local && h.What != "bonked" {
176 var emu Emu
177 emucache.Get(e, &emu)
178 if emu.ID != "" {
179 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
180 }
181 }
182 return e
183 }
184 htf.FilterText = func(w io.Writer, data string) {
185 data = htfilter.EscapeText(data)
186 data = re_emus.ReplaceAllStringFunc(data, emuxifier)
187 io.WriteString(w, data)
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(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_convalidate = regexp.MustCompile("^(https?|tag|data):")
459
460func memetize(honk *Honk) {
461 repl := func(x string) string {
462 name := x[5:]
463 if name[0] == ' ' {
464 name = name[1:]
465 }
466 fd, err := os.Open(dataDir + "/memes/" + name)
467 if err != nil {
468 ilog.Printf("no meme for %s", name)
469 return x
470 }
471 var peek [512]byte
472 n, _ := fd.Read(peek[:])
473 ct := http.DetectContentType(peek[:n])
474 fd.Close()
475
476 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
477 fileid, err := savefile(name, name, url, ct, false, nil)
478 if err != nil {
479 elog.Printf("error saving meme: %s", err)
480 return x
481 }
482 d := &Donk{
483 FileID: fileid,
484 Name: name,
485 Media: ct,
486 URL: url,
487 Local: false,
488 }
489 honk.Donks = append(honk.Donks, d)
490 return ""
491 }
492 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
493}
494
495var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]_]+([ \n:;.,']|$)")
496
497func quickrename(s string, userid int64) string {
498 nonstop := true
499 for nonstop {
500 nonstop = false
501 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
502 prefix := ""
503 if m[0] == ' ' || m[0] == '\n' {
504 prefix = m[:1]
505 m = m[1:]
506 }
507 prefix += "@"
508 m = m[1:]
509 tail := ""
510 if last := m[len(m)-1]; last == ' ' || last == '\n' ||
511 last == ':' || last == ';' ||
512 last == '.' || last == ',' || last == '\'' {
513 tail = m[len(m)-1:]
514 m = m[:len(m)-1]
515 }
516
517 xid := fullname(m, userid)
518
519 if xid != "" {
520 _, name := handles(xid)
521 if name != "" {
522 nonstop = true
523 m = name
524 }
525 }
526 return prefix + m + tail
527 })
528 }
529 return s
530}
531
532var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
533 honkers := gethonkers(userid)
534 m := make(map[string]string)
535 for _, h := range honkers {
536 m[h.XID] = h.Name
537 }
538 return m, true
539}, Invalidator: &honkerinvalidator})
540
541func shortname(userid int64, xid string) string {
542 var m map[string]string
543 ok := shortnames.Get(userid, &m)
544 if ok {
545 return m[xid]
546 }
547 return ""
548}
549
550var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
551 honkers := gethonkers(userid)
552 m := make(map[string]string)
553 for _, h := range honkers {
554 m[h.Name] = h.XID
555 }
556 return m, true
557}, Invalidator: &honkerinvalidator})
558
559func fullname(name string, userid int64) string {
560 var m map[string]string
561 ok := fullnames.Get(userid, &m)
562 if ok {
563 return m[name]
564 }
565 return ""
566}
567
568func attoreplacer(m string) string {
569 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
570 where := gofish(m)
571 if where == "" {
572 return m
573 }
574 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
575 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
576}
577
578func ontoreplacer(h string) string {
579 return fmt.Sprintf(`<a class="mention hashtag" href="https://%s/o/%s">%s</a>`, serverName,
580 strings.ToLower(h[1:]), h)
581}
582
583var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
584var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
585
586func originate(u string) string {
587 m := re_urlhost.FindStringSubmatch(u)
588 if len(m) > 1 {
589 return m[1]
590 }
591 return ""
592}
593
594var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
595 handle := getxonker(xid, "handle")
596 if handle == "" {
597 dlog.Printf("need to get a handle: %s", xid)
598 info, err := investigate(xid)
599 if err != nil {
600 m := re_unurl.FindStringSubmatch(xid)
601 if len(m) > 2 {
602 handle = m[2]
603 } else {
604 handle = xid
605 }
606 } else {
607 handle = info.Name
608 }
609 }
610 return handle, true
611}})
612
613// handle, handle@host
614func handles(xid string) (string, string) {
615 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
616 return "", ""
617 }
618 var handle string
619 allhandles.Get(xid, &handle)
620 if handle == xid {
621 return xid, xid
622 }
623 return handle, handle + "@" + originate(xid)
624}
625
626func butnottooloud(aud []string) {
627 for i, a := range aud {
628 if strings.HasSuffix(a, "/followers") {
629 aud[i] = ""
630 }
631 }
632}
633
634func loudandproud(aud []string) bool {
635 for _, a := range aud {
636 if a == thewholeworld {
637 return true
638 }
639 }
640 return false
641}
642
643func firstclass(honk *Honk) bool {
644 return honk.Audience[0] == thewholeworld
645}
646
647func oneofakind(a []string) []string {
648 seen := make(map[string]bool)
649 seen[""] = true
650 j := 0
651 for _, s := range a {
652 if !seen[s] {
653 seen[s] = true
654 a[j] = s
655 j++
656 }
657 }
658 return a[:j]
659}
660
661var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
662 var user *WhatAbout
663 ok := somenumberedusers.Get(userid, &user)
664 if !ok {
665 return nil, false
666 }
667 ki := new(KeyInfo)
668 ki.keyname = user.URL + "#key"
669 ki.seckey = user.SecKey
670 return ki, true
671}})
672
673func ziggy(userid int64) *KeyInfo {
674 var ki *KeyInfo
675 ziggies.Get(userid, &ki)
676 return ki
677}
678
679var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
680 data := getxonker(keyname, "pubkey")
681 if data == "" {
682 dlog.Printf("hitting the webs for missing pubkey: %s", keyname)
683 j, err := GetJunk(readyLuserOne, keyname)
684 if err != nil {
685 ilog.Printf("error getting %s pubkey: %s", keyname, err)
686 when := time.Now().UTC().Format(dbtimeformat)
687 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
688 return httpsig.PublicKey{}, true
689 }
690 allinjest(originate(keyname), j)
691 data = getxonker(keyname, "pubkey")
692 if data == "" {
693 ilog.Printf("key not found after ingesting")
694 when := time.Now().UTC().Format(dbtimeformat)
695 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
696 return httpsig.PublicKey{}, true
697 }
698 }
699 if data == "failed" {
700 ilog.Printf("lookup previously failed key %s", keyname)
701 return httpsig.PublicKey{}, true
702 }
703 _, key, err := httpsig.DecodeKey(data)
704 if err != nil {
705 ilog.Printf("error decoding %s pubkey: %s", keyname, err)
706 return key, true
707 }
708 return key, true
709}, Limit: 512})
710
711func zaggy(keyname string) (httpsig.PublicKey, error) {
712 var key httpsig.PublicKey
713 zaggies.Get(keyname, &key)
714 return key, nil
715}
716
717func savingthrow(keyname string) {
718 when := time.Now().Add(-30 * time.Minute).UTC().Format(dbtimeformat)
719 stmtDeleteXonker.Exec(keyname, "pubkey", when)
720 zaggies.Clear(keyname)
721}
722
723func keymatch(keyname string, actor string) string {
724 origin := originate(actor)
725 if origin == originate(keyname) {
726 return origin
727 }
728 return ""
729}