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