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/gencache"
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 user, _ := somenumberedusers.Get(userid)
66 for _, h := range honks {
67 h.What += "ed"
68 if h.What == "honked" && h.RID != "" {
69 h.What = "honked back"
70 h.Style += " subtle"
71 }
72 if !h.Public {
73 h.Style += " limited"
74 }
75 if h.Whofore == 1 {
76 h.Style += " atme"
77 }
78 translate(h)
79 local := false
80 if h.Whofore == 2 || h.Whofore == 3 {
81 local = true
82 }
83 if local && h.What != "bonked" {
84 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
85 }
86 h.Username, h.Handle = handles(h.Honker)
87 if !local {
88 short := shortname(userid, h.Honker)
89 if short != "" {
90 h.Username = short
91 } else {
92 h.Username = h.Handle
93 if len(h.Username) > 20 {
94 h.Username = h.Username[:20] + ".."
95 }
96 }
97 }
98 if user != nil {
99 hset := []string{}
100 if h.Honker != user.URL {
101 hset = append(hset, "@"+h.Handle)
102 }
103 if user.Options.MentionAll {
104 for _, a := range h.Audience {
105 if a == h.Honker || a == user.URL {
106 continue
107 }
108 _, hand := handles(a)
109 if hand != "" {
110 hand = "@" + hand
111 hset = append(hset, hand)
112 }
113 }
114 }
115 h.Handles = strings.Join(hset, " ")
116 }
117 if h.URL == "" {
118 h.URL = h.XID
119 }
120 if h.Oonker != "" {
121 _, h.Oondle = handles(h.Oonker)
122 }
123 h.Precis = demoji(h.Precis)
124 h.Noise = demoji(h.Noise)
125 h.Open = "open"
126 var misto string
127 for _, m := range h.Mentions {
128 if m.Where != h.Honker && !m.IsPresent(h.Noise) {
129 misto += " " + m.Who
130 }
131 }
132 var mistag string
133 for _, o := range h.Onts {
134 if !OntIsPresent(o, h.Noise) {
135 mistag += " " + o
136 }
137 }
138 if len(misto) > 0 || len(mistag) > 0 {
139 if len(misto) > 0 {
140 misto = "(" + misto[1:] + ")<p>"
141 }
142 if len(mistag) > 0 {
143 mistag = "<p>(" + mistag[1:] + ")"
144 }
145 h.Noise = misto + h.Noise + mistag
146 }
147
148 zap := make(map[string]bool)
149 {
150 var htf htfilter.Filter
151 htf.Imager = replaceimgsand(zap, false)
152 htf.SpanClasses = allowedclasses
153 htf.BaseURL, _ = url.Parse(h.XID)
154 emuxifier := func(e string) string {
155 for _, d := range h.Donks {
156 if d.Name == e {
157 zap[d.XID] = true
158 if d.Local {
159 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
160 }
161 }
162 }
163 if local && h.What != "bonked" {
164 emu, _ := emucache.Get(e)
165 if emu != nil {
166 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
167 }
168 }
169 return e
170 }
171 htf.FilterText = func(w io.Writer, data string) {
172 data = htfilter.EscapeText(data)
173 data = re_emus.ReplaceAllStringFunc(data, emuxifier)
174 io.WriteString(w, data)
175 }
176 if user != nil {
177 htf.RetargetLink = func(href string) string {
178 h2 := strings.ReplaceAll(href, "/@", "/users/")
179 for _, m := range h.Mentions {
180 if h2 == m.Where || href == m.Where {
181 return "/h?xid=" + url.QueryEscape(m.Where)
182 }
183 }
184 return href
185 }
186 }
187 p, _ := htf.String(h.Precis)
188 n, _ := htf.String(h.Noise)
189 h.Precis = string(p)
190 h.Noise = string(n)
191 }
192 j := 0
193 for i := 0; i < len(h.Donks); i++ {
194 if !zap[h.Donks[i].XID] {
195 h.Donks[j] = h.Donks[i]
196 j++
197 }
198 }
199 h.Donks = h.Donks[:j]
200 }
201
202 unsee(honks, userid)
203
204 for _, h := range honks {
205 renderflags(h)
206
207 h.HTPrecis = template.HTML(h.Precis)
208 h.HTML = template.HTML(h.Noise)
209 if redo := relingo[h.What]; redo != "" {
210 h.What = redo
211 }
212 }
213}
214
215func replaceimgsand(zap map[string]bool, absolute bool) func(node *html.Node) string {
216 return func(node *html.Node) string {
217 src := htfilter.GetAttr(node, "src")
218 alt := htfilter.GetAttr(node, "alt")
219 //title := GetAttr(node, "title")
220 if htfilter.HasClass(node, "Emoji") && alt != "" {
221 return alt
222 }
223 d := finddonk(src)
224 if d != nil {
225 zap[d.XID] = true
226 base := ""
227 if absolute {
228 base = serverURL("")
229 }
230 return string(templates.Sprintf(`<img alt="%s" title="%s" src="%s/d/%s">`, alt, alt, base, d.XID))
231 }
232 return string(templates.Sprintf(`<img alt="%s" src="<a href="%s">%s</a>">`, alt, src, src))
233 }
234}
235
236func translatechonk(ch *Chonk) {
237 noise := ch.Noise
238 if ch.Format == "markdown" {
239 var marker mz.Marker
240 noise = marker.Mark(noise)
241 }
242 var htf htfilter.Filter
243 htf.SpanClasses = allowedclasses
244 htf.BaseURL, _ = url.Parse(ch.XID)
245 ch.HTML, _ = htf.String(noise)
246}
247
248func filterchonk(ch *Chonk) {
249 translatechonk(ch)
250
251 noise := string(ch.HTML)
252
253 local := originate(ch.XID) == serverName
254
255 zap := make(map[string]bool)
256 emuxifier := func(e string) string {
257 for _, d := range ch.Donks {
258 if d.Name == e {
259 zap[d.XID] = true
260 if d.Local {
261 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
262 }
263 }
264 }
265 if local {
266 emu, _ := emucache.Get(e)
267 if emu != nil {
268 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
269 }
270 }
271 return e
272 }
273 noise = re_emus.ReplaceAllStringFunc(noise, emuxifier)
274 j := 0
275 for i := 0; i < len(ch.Donks); i++ {
276 if !zap[ch.Donks[i].XID] {
277 ch.Donks[j] = ch.Donks[i]
278 j++
279 }
280 }
281 ch.Donks = ch.Donks[:j]
282
283 if strings.HasPrefix(noise, "<p>") {
284 noise = noise[3:]
285 }
286 ch.HTML = template.HTML(noise)
287 if short := shortname(ch.UserID, ch.Who); short != "" {
288 ch.Handle = short
289 } else {
290 ch.Handle, _ = handles(ch.Who)
291 }
292
293}
294
295func inlineimgsfor(honk *Honk) func(node *html.Node) string {
296 return func(node *html.Node) string {
297 src := htfilter.GetAttr(node, "src")
298 alt := htfilter.GetAttr(node, "alt")
299 d := savedonk(src, "image", alt, "image", true)
300 if d != nil {
301 honk.Donks = append(honk.Donks, d)
302 }
303 dlog.Printf("inline img with src: %s", src)
304 return ""
305 }
306}
307
308func imaginate(honk *Honk) {
309 var htf htfilter.Filter
310 htf.Imager = inlineimgsfor(honk)
311 htf.BaseURL, _ = url.Parse(honk.XID)
312 htf.String(honk.Noise)
313}
314
315var re_dangerous = regexp.MustCompile("^[a-zA-Z]{2}:")
316
317func precipitate(honk *Honk) {
318 noise := honk.Noise
319 if re_dangerous.MatchString(noise) {
320 idx := strings.Index(noise, "\n")
321 if idx == -1 {
322 honk.Precis = noise
323 noise = ""
324 } else {
325 honk.Precis = noise[:idx]
326 noise = noise[idx+1:]
327 }
328 var marker mz.Marker
329 marker.Short = true
330 honk.Precis = marker.Mark(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 marker.AllowImages = true
345 noise = strings.TrimSpace(noise)
346 noise = marker.Mark(noise)
347 honk.Noise = noise
348 honk.Onts = append(honk.Onts, marker.HashTags...)
349 honk.Mentions = bunchofgrapes(marker.Mentions)
350 for _, t := range oneofakind(strings.Split(honk.Onties, " ")) {
351 if t[0] != '#' {
352 t = "#" + t
353 }
354 honk.Onts = append(honk.Onts, t)
355 }
356 honk.Onts = oneofakind(honk.Onts)
357 honk.Mentions = append(honk.Mentions, bunchofgrapes(oneofakind(strings.Split(honk.SeeAlso, " ")))...)
358}
359
360func redoimages(honk *Honk) {
361 zap := make(map[string]bool)
362 {
363 var htf htfilter.Filter
364 htf.Imager = replaceimgsand(zap, true)
365 htf.SpanClasses = allowedclasses
366 p, _ := htf.String(honk.Precis)
367 n, _ := htf.String(honk.Noise)
368 honk.Precis = string(p)
369 honk.Noise = string(n)
370 }
371 j := 0
372 for i := 0; i < len(honk.Donks); i++ {
373 if !zap[honk.Donks[i].XID] {
374 honk.Donks[j] = honk.Donks[i]
375 j++
376 }
377 }
378 honk.Donks = honk.Donks[:j]
379
380 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
381 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
382}
383
384func xcelerate(b []byte) string {
385 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
386 for i, c := range b {
387 b[i] = letters[c&63]
388 }
389 s := string(b)
390 return s
391}
392
393func shortxid(xid string) string {
394 h := sha512.New512_256()
395 io.WriteString(h, xid)
396 return xcelerate(h.Sum(nil)[:20])
397}
398
399func xfiltrate() string {
400 var b [18]byte
401 rand.Read(b[:])
402 return xcelerate(b[:])
403}
404
405func grapevine(mentions []Mention) []string {
406 var s []string
407 for _, m := range mentions {
408 s = append(s, m.Where)
409 }
410 return s
411}
412
413func bunchofgrapes(m []string) []Mention {
414 var mentions []Mention
415 for i := range m {
416 who := m[i]
417 if strings.HasPrefix(who, "@https://") {
418 mentions = append(mentions, Mention{Who: who, Where: who[1:]})
419 continue
420 }
421 where := gofish(who)
422 if where != "" {
423 mentions = append(mentions, Mention{Who: who, Where: where})
424 }
425 }
426 return mentions
427}
428
429type Emu struct {
430 ID string
431 Name string
432 Type string
433}
434
435var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
436
437var emucache = gencache.New(gencache.Options[string, *Emu]{Fill: func(ename string) (*Emu, bool) {
438 fname := ename[1 : len(ename)-1]
439 exts := []string{".png", ".gif"}
440 for _, ext := range exts {
441 _, err := os.Stat(dataDir + "/emus/" + fname + ext)
442 if err != nil {
443 continue
444 }
445 url := serverURL("/emu/%s%s", fname, ext)
446 if develMode {
447 url = fmt.Sprintf("/emu/%s%s", fname, ext)
448 }
449 return &Emu{ID: url, Name: ename, Type: "image/" + ext[1:]}, true
450 }
451 return nil, true
452}, Duration: 10 * time.Second})
453
454func herdofemus(noise string) []*Emu {
455 m := re_emus.FindAllString(noise, -1)
456 m = oneofakind(m)
457 var emus []*Emu
458 for _, e := range m {
459 emu, _ := emucache.Get(e)
460 if emu == nil {
461 continue
462 }
463 emus = append(emus, emu)
464 }
465 return emus
466}
467
468var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
469var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
470var re_banner = regexp.MustCompile("banner: ?([^\n]+)")
471var re_convoy = regexp.MustCompile("convoy: ?([^\n]+)")
472var re_convalidate = regexp.MustCompile("^(https?|tag|data):")
473
474func memetize(honk *Honk) {
475 repl := func(x string) string {
476 name := x[5:]
477 if name[0] == ' ' {
478 name = name[1:]
479 }
480 fd, err := os.Open(dataDir + "/memes/" + name)
481 if err != nil {
482 ilog.Printf("no meme for %s", name)
483 return x
484 }
485 var peek [512]byte
486 n, _ := fd.Read(peek[:])
487 ct := http.DetectContentType(peek[:n])
488 fd.Close()
489
490 url := serverURL("/meme/%s", name)
491 fileid, err := savefile(name, name, url, ct, false, nil)
492 if err != nil {
493 elog.Printf("error saving meme: %s", err)
494 return x
495 }
496 d := &Donk{
497 FileID: fileid,
498 Name: name,
499 Media: ct,
500 URL: url,
501 Local: false,
502 }
503 honk.Donks = append(honk.Donks, d)
504 return ""
505 }
506 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
507}
508
509var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]_]+([ \n:;.,']|$)")
510
511func quickrename(s string, userid int64) string {
512 nonstop := true
513 for nonstop {
514 nonstop = false
515 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
516 prefix := ""
517 if m[0] == ' ' || m[0] == '\n' {
518 prefix = m[:1]
519 m = m[1:]
520 }
521 prefix += "@"
522 m = m[1:]
523 tail := ""
524 if last := m[len(m)-1]; last == ' ' || last == '\n' ||
525 last == ':' || last == ';' ||
526 last == '.' || last == ',' || last == '\'' {
527 tail = m[len(m)-1:]
528 m = m[:len(m)-1]
529 }
530
531 xid := fullname(m, userid)
532
533 if xid != "" {
534 _, name := handles(xid)
535 if name != "" {
536 nonstop = true
537 m = name
538 }
539 }
540 return prefix + m + tail
541 })
542 }
543 return s
544}
545
546var shortnames = gencache.New(gencache.Options[int64, map[string]string]{Fill: func(userid int64) (map[string]string, bool) {
547 honkers := gethonkers(userid)
548 m := make(map[string]string)
549 for _, h := range honkers {
550 m[h.XID] = h.Name
551 }
552 return m, true
553}, Invalidator: &honkerinvalidator})
554
555func shortname(userid int64, xid string) string {
556 m, ok := shortnames.Get(userid)
557 if ok {
558 return m[xid]
559 }
560 return ""
561}
562
563var fullnames = gencache.New(gencache.Options[int64, map[string]string]{Fill: func(userid int64) (map[string]string, bool) {
564 honkers := gethonkers(userid)
565 m := make(map[string]string)
566 for _, h := range honkers {
567 m[h.Name] = h.XID
568 }
569 return m, true
570}, Invalidator: &honkerinvalidator})
571
572func fullname(name string, userid int64) string {
573 m, ok := fullnames.Get(userid)
574 if ok {
575 return m[name]
576 }
577 return ""
578}
579
580func attoreplacer(m string) string {
581 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
582 if strings.HasPrefix(m, "@https://") {
583 return fmt.Sprintf(fill, html.EscapeString(m[1:]), html.EscapeString(m))
584 }
585 where := gofish(m)
586 if where == "" {
587 return m
588 }
589 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
590 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
591}
592
593func ontoreplacer(h string) string {
594 return fmt.Sprintf(`<a class="mention hashtag" href="%s">%s</a>`,
595 serverURL("/o/%s", strings.ToLower(h[1:])), h)
596}
597
598var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
599var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
600
601func originate(u string) string {
602 m := re_urlhost.FindStringSubmatch(u)
603 if len(m) > 1 {
604 return m[1]
605 }
606 return ""
607}
608
609var allhandles = gencache.New(gencache.Options[string, string]{Fill: func(xid string) (string, bool) {
610 handle := getxonker(xid, "handle")
611 if handle == "" {
612 dlog.Printf("need to get a handle: %s", xid)
613 info, err := investigate(xid)
614 if err != nil {
615 m := re_unurl.FindStringSubmatch(xid)
616 if len(m) > 2 {
617 handle = m[2]
618 } else {
619 handle = xid
620 }
621 } else {
622 handle = info.Name
623 }
624 }
625 return handle, true
626}})
627
628// handle, handle@host
629func handles(xid string) (string, string) {
630 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
631 return "", ""
632 }
633 handle, _ := allhandles.Get(xid)
634 if handle == xid {
635 return xid, xid
636 }
637 return handle, handle + "@" + originate(xid)
638}
639
640func butnottooloud(aud []string) {
641 for i, a := range aud {
642 if strings.HasSuffix(a, "/followers") {
643 aud[i] = ""
644 }
645 }
646}
647
648func loudandproud(aud []string) bool {
649 for _, a := range aud {
650 if a == thewholeworld {
651 return true
652 }
653 }
654 return false
655}
656
657func firstclass(honk *Honk) bool {
658 return honk.Audience[0] == thewholeworld
659}
660
661func oneofakind(a []string) []string {
662 seen := make(map[string]bool)
663 seen[""] = true
664 j := 0
665 for _, s := range a {
666 if !seen[s] {
667 seen[s] = true
668 a[j] = s
669 j++
670 }
671 }
672 return a[:j]
673}
674
675var ziggies = gencache.New(gencache.Options[int64, *KeyInfo]{Fill: func(userid int64) (*KeyInfo, bool) {
676 user, ok := somenumberedusers.Get(userid)
677 if !ok {
678 return nil, false
679 }
680 ki := new(KeyInfo)
681 ki.keyname = user.URL + "#key"
682 ki.seckey = user.SecKey
683 return ki, true
684}})
685
686func ziggy(userid int64) *KeyInfo {
687 ki, _ := ziggies.Get(userid)
688 return ki
689}
690
691var zaggies = gencache.New(gencache.Options[string, httpsig.PublicKey]{Fill: func(keyname string) (httpsig.PublicKey, bool) {
692 data := getxonker(keyname, "pubkey")
693 if data == "" {
694 dlog.Printf("hitting the webs for missing pubkey: %s", keyname)
695 j, err := GetJunk(readyLuserOne, keyname)
696 if err != nil {
697 ilog.Printf("error getting %s pubkey: %s", keyname, err)
698 when := time.Now().UTC().Format(dbtimeformat)
699 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
700 return httpsig.PublicKey{}, true
701 }
702 allinjest(originate(keyname), j)
703 data = getxonker(keyname, "pubkey")
704 if data == "" {
705 ilog.Printf("key not found after ingesting")
706 when := time.Now().UTC().Format(dbtimeformat)
707 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
708 return httpsig.PublicKey{}, true
709 }
710 }
711 if data == "failed" {
712 ilog.Printf("lookup previously failed key %s", keyname)
713 return httpsig.PublicKey{}, true
714 }
715 _, key, err := httpsig.DecodeKey(data)
716 if err != nil {
717 ilog.Printf("error decoding %s pubkey: %s", keyname, err)
718 return key, true
719 }
720 return key, true
721}, Limit: 512})
722
723func zaggy(keyname string) (httpsig.PublicKey, error) {
724 key, _ := zaggies.Get(keyname)
725 return key, nil
726}
727
728func savingthrow(keyname string) {
729 when := time.Now().Add(-30 * time.Minute).UTC().Format(dbtimeformat)
730 stmtDeleteXonker.Exec(keyname, "pubkey", when)
731 zaggies.Clear(keyname)
732}
733
734func keymatch(keyname string, actor string) string {
735 origin := originate(actor)
736 if origin == originate(keyname) {
737 return origin
738 }
739 return ""
740}