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