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_retag.ReplaceAllString(h.Noise, "")
113 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
114 }
115 h.Username, h.Handle = handles(h.Honker)
116 if !local {
117 short := shortname(userid, h.Honker)
118 if short != "" {
119 h.Username = short
120 } else {
121 h.Username = h.Handle
122 if len(h.Username) > 20 {
123 h.Username = h.Username[:20] + ".."
124 }
125 }
126 }
127 if user != nil {
128 hset := []string{}
129 if h.Honker != user.URL {
130 hset = append(hset, "@"+h.Handle)
131 }
132 if user.Options.MentionAll {
133 for _, a := range h.Audience {
134 if a == h.Honker || a == user.URL {
135 continue
136 }
137 _, hand := handles(a)
138 if hand != "" {
139 hand = "@" + hand
140 hset = append(hset, hand)
141 }
142 }
143 }
144 h.Handles = strings.Join(hset, " ")
145 }
146 if h.URL == "" {
147 h.URL = h.XID
148 }
149 if h.Oonker != "" {
150 _, h.Oondle = handles(h.Oonker)
151 }
152 h.Precis = demoji(h.Precis)
153 h.Noise = demoji(h.Noise)
154 h.Open = "open"
155 var misto string
156 for _, m := range h.Mentions {
157 if m.Where != h.Honker && !m.IsPresent(h.Noise) {
158 misto += " " + m.Who
159 }
160 }
161 var mistag string
162 for _, o := range h.Onts {
163 if !OntIsPresent(o, h.Noise) {
164 mistag += " " + o
165 }
166 }
167 if len(misto) > 0 || len(mistag) > 0 {
168 if len(misto) > 0 {
169 misto = "(" + misto[1:] + ")<p>"
170 }
171 if len(mistag) > 0 {
172 mistag = "<p>(" + mistag[1:] + ")"
173 }
174 h.Noise = misto + h.Noise + mistag
175 }
176
177 zap := make(map[string]bool)
178 {
179 var htf htfilter.Filter
180 htf.Imager = replaceimgsand(zap, false)
181 htf.SpanClasses = allowedclasses
182 htf.BaseURL, _ = url.Parse(h.XID)
183 emuxifier := func(e string) string {
184 for _, d := range h.Donks {
185 if d.Name == e {
186 zap[d.XID] = true
187 if d.Local {
188 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
189 }
190 }
191 }
192 if local && h.What != "bonked" {
193 var emu Emu
194 emucache.Get(e, &emu)
195 if emu.ID != "" {
196 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
197 }
198 }
199 return e
200 }
201 htf.FilterText = func(w io.Writer, data string) {
202 data = htfilter.EscapeText(data)
203 data = re_emus.ReplaceAllStringFunc(data, emuxifier)
204 io.WriteString(w, data)
205 }
206 if user != nil {
207 htf.RetargetLink = func(href string) string {
208 h2 := strings.ReplaceAll(href, "/@", "/users/")
209 for _, m := range h.Mentions {
210 if h2 == m.Where || href == m.Where {
211 return "/h?xid=" + url.QueryEscape(m.Where)
212 }
213 }
214 return href
215 }
216 }
217 p, _ := htf.String(h.Precis)
218 n, _ := htf.String(h.Noise)
219 h.Precis = string(p)
220 h.Noise = string(n)
221 }
222 j := 0
223 for i := 0; i < len(h.Donks); i++ {
224 if !zap[h.Donks[i].XID] {
225 h.Donks[j] = h.Donks[i]
226 j++
227 }
228 }
229 h.Donks = h.Donks[:j]
230 }
231
232 unsee(honks, userid)
233
234 for _, h := range honks {
235 renderflags(h)
236
237 h.HTPrecis = template.HTML(h.Precis)
238 h.HTML = template.HTML(h.Noise)
239 if redo := relingo[h.What]; redo != "" {
240 h.What = redo
241 }
242 }
243}
244
245func replaceimgsand(zap map[string]bool, absolute bool) func(node *html.Node) string {
246 return func(node *html.Node) string {
247 src := htfilter.GetAttr(node, "src")
248 alt := htfilter.GetAttr(node, "alt")
249 //title := GetAttr(node, "title")
250 if htfilter.HasClass(node, "Emoji") && alt != "" {
251 return alt
252 }
253 d := finddonk(src)
254 if d != nil {
255 zap[d.XID] = true
256 base := ""
257 if absolute {
258 base = "https://" + serverName
259 }
260 return string(templates.Sprintf(`<img alt="%s" title="%s" src="%s/d/%s">`, alt, alt, base, d.XID))
261 }
262 return string(templates.Sprintf(`<img alt="%s" src="<a href="%s">%s</a>">`, alt, src, src))
263 }
264}
265
266func translatechonk(ch *Chonk) {
267 noise := ch.Noise
268 if ch.Format == "markdown" {
269 var marker mz.Marker
270 noise = marker.Mark(noise)
271 }
272 var htf htfilter.Filter
273 htf.SpanClasses = allowedclasses
274 htf.BaseURL, _ = url.Parse(ch.XID)
275 ch.HTML, _ = htf.String(noise)
276}
277
278func filterchonk(ch *Chonk) {
279 translatechonk(ch)
280
281 noise := string(ch.HTML)
282
283 local := originate(ch.XID) == serverName
284
285 zap := make(map[string]bool)
286 emuxifier := func(e string) string {
287 for _, d := range ch.Donks {
288 if d.Name == e {
289 zap[d.XID] = true
290 if d.Local {
291 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
292 }
293 }
294 }
295 if local {
296 var emu Emu
297 emucache.Get(e, &emu)
298 if emu.ID != "" {
299 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
300 }
301 }
302 return e
303 }
304 noise = re_emus.ReplaceAllStringFunc(noise, emuxifier)
305 j := 0
306 for i := 0; i < len(ch.Donks); i++ {
307 if !zap[ch.Donks[i].XID] {
308 ch.Donks[j] = ch.Donks[i]
309 j++
310 }
311 }
312 ch.Donks = ch.Donks[:j]
313
314 if strings.HasPrefix(noise, "<p>") {
315 noise = noise[3:]
316 }
317 ch.HTML = template.HTML(noise)
318 if short := shortname(ch.UserID, ch.Who); short != "" {
319 ch.Handle = short
320 } else {
321 ch.Handle, _ = handles(ch.Who)
322 }
323
324}
325
326func inlineimgsfor(honk *Honk) func(node *html.Node) string {
327 return func(node *html.Node) string {
328 src := htfilter.GetAttr(node, "src")
329 alt := htfilter.GetAttr(node, "alt")
330 d := savedonk(src, "image", alt, "image", true)
331 if d != nil {
332 honk.Donks = append(honk.Donks, d)
333 }
334 dlog.Printf("inline img with src: %s", src)
335 return ""
336 }
337}
338
339func imaginate(honk *Honk) {
340 var htf htfilter.Filter
341 htf.Imager = inlineimgsfor(honk)
342 htf.BaseURL, _ = url.Parse(honk.XID)
343 htf.String(honk.Noise)
344}
345
346var re_dangerous = regexp.MustCompile("^[a-zA-Z]{2}:")
347
348func precipitate(honk *Honk) {
349 noise := honk.Noise
350 if re_dangerous.MatchString(noise) {
351 idx := strings.Index(noise, "\n")
352 if idx == -1 {
353 honk.Precis = noise
354 noise = ""
355 } else {
356 honk.Precis = noise[:idx]
357 noise = noise[idx+1:]
358 }
359 var marker mz.Marker
360 honk.Precis = marker.Mark(strings.TrimSpace(honk.Precis))
361 honk.Noise = noise
362 }
363}
364
365func translate(honk *Honk) {
366 if honk.Format == "html" {
367 return
368 }
369 noise := honk.Noise
370
371 var marker mz.Marker
372 marker.HashLinker = ontoreplacer
373 marker.AtLinker = attoreplacer
374 marker.AllowImages = true
375 noise = strings.TrimSpace(noise)
376 noise = marker.Mark(noise)
377 honk.Noise = noise
378 honk.Onts = oneofakind(append(honk.Onts, marker.HashTags...))
379 honk.Mentions = bunchofgrapes(marker.Mentions)
380}
381
382func redoimages(honk *Honk) {
383 zap := make(map[string]bool)
384 {
385 var htf htfilter.Filter
386 htf.Imager = replaceimgsand(zap, true)
387 htf.SpanClasses = allowedclasses
388 p, _ := htf.String(honk.Precis)
389 n, _ := htf.String(honk.Noise)
390 honk.Precis = string(p)
391 honk.Noise = string(n)
392 }
393 j := 0
394 for i := 0; i < len(honk.Donks); i++ {
395 if !zap[honk.Donks[i].XID] {
396 honk.Donks[j] = honk.Donks[i]
397 j++
398 }
399 }
400 honk.Donks = honk.Donks[:j]
401
402 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
403 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
404}
405
406func xcelerate(b []byte) string {
407 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
408 for i, c := range b {
409 b[i] = letters[c&63]
410 }
411 s := string(b)
412 return s
413}
414
415func shortxid(xid string) string {
416 h := sha512.New512_256()
417 io.WriteString(h, xid)
418 return xcelerate(h.Sum(nil)[:20])
419}
420
421func xfiltrate() string {
422 var b [18]byte
423 rand.Read(b[:])
424 return xcelerate(b[:])
425}
426
427func grapevine(mentions []Mention) []string {
428 var s []string
429 for _, m := range mentions {
430 s = append(s, m.Where)
431 }
432 return s
433}
434
435func bunchofgrapes(m []string) []Mention {
436 var mentions []Mention
437 for i := range m {
438 where := gofish(m[i])
439 if where != "" {
440 mentions = append(mentions, Mention{Who: m[i], Where: where})
441 }
442 }
443 return mentions
444}
445
446type Emu struct {
447 ID string
448 Name string
449 Type string
450}
451
452var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
453
454var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
455 fname := ename[1 : len(ename)-1]
456 exts := []string{".png", ".gif"}
457 for _, ext := range exts {
458 _, err := os.Stat(dataDir + "/emus/" + fname + ext)
459 if err != nil {
460 continue
461 }
462 url := fmt.Sprintf("https://%s/emu/%s%s", serverName, fname, ext)
463 if develMode {
464 url = fmt.Sprintf("/emu/%s%s", fname, ext)
465 }
466 return Emu{ID: url, Name: ename, Type: "image/" + ext[1:]}, true
467 }
468 return Emu{Name: ename, ID: "", Type: "image/png"}, true
469}, Duration: 10 * time.Second})
470
471func herdofemus(noise string) []Emu {
472 m := re_emus.FindAllString(noise, -1)
473 m = oneofakind(m)
474 var emus []Emu
475 for _, e := range m {
476 var emu Emu
477 emucache.Get(e, &emu)
478 if emu.ID == "" {
479 continue
480 }
481 emus = append(emus, emu)
482 }
483 return emus
484}
485
486var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
487var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
488var re_banner = regexp.MustCompile("banner: ?([^\n]+)")
489var re_convoy = regexp.MustCompile("convoy: ?([^\n]+)")
490var re_retag = regexp.MustCompile("tags: ?([^\n]+)")
491var re_convalidate = regexp.MustCompile("^(https?|tag|data):")
492
493func memetize(honk *Honk) {
494 repl := func(x string) string {
495 name := x[5:]
496 if name[0] == ' ' {
497 name = name[1:]
498 }
499 fd, err := os.Open(dataDir + "/memes/" + name)
500 if err != nil {
501 ilog.Printf("no meme for %s", name)
502 return x
503 }
504 var peek [512]byte
505 n, _ := fd.Read(peek[:])
506 ct := http.DetectContentType(peek[:n])
507 fd.Close()
508
509 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
510 fileid, err := savefile(name, name, url, ct, false, nil)
511 if err != nil {
512 elog.Printf("error saving meme: %s", err)
513 return x
514 }
515 d := &Donk{
516 FileID: fileid,
517 Name: name,
518 Media: ct,
519 URL: url,
520 Local: false,
521 }
522 honk.Donks = append(honk.Donks, d)
523 return ""
524 }
525 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
526}
527
528func recategorize(honk *Honk) {
529 repl := func(x string) string {
530 x = x[5:]
531 for _, t := range strings.Split(x, " ") {
532 if t == "" {
533 continue
534 }
535 if t[0] != '#' {
536 t = "#" + t
537 }
538 dlog.Printf("hashtag: %s", t)
539 honk.Onts = append(honk.Onts, t)
540 }
541 return ""
542 }
543 honk.Noise = re_retag.ReplaceAllStringFunc(honk.Noise, repl)
544}
545
546var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]_]+([ \n:;.,']|$)")
547
548func quickrename(s string, userid int64) string {
549 nonstop := true
550 for nonstop {
551 nonstop = false
552 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
553 prefix := ""
554 if m[0] == ' ' || m[0] == '\n' {
555 prefix = m[:1]
556 m = m[1:]
557 }
558 prefix += "@"
559 m = m[1:]
560 tail := ""
561 if last := m[len(m)-1]; last == ' ' || last == '\n' ||
562 last == ':' || last == ';' ||
563 last == '.' || last == ',' || last == '\'' {
564 tail = m[len(m)-1:]
565 m = m[:len(m)-1]
566 }
567
568 xid := fullname(m, userid)
569
570 if xid != "" {
571 _, name := handles(xid)
572 if name != "" {
573 nonstop = true
574 m = name
575 }
576 }
577 return prefix + m + tail
578 })
579 }
580 return s
581}
582
583var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
584 honkers := gethonkers(userid)
585 m := make(map[string]string)
586 for _, h := range honkers {
587 m[h.XID] = h.Name
588 }
589 return m, true
590}, Invalidator: &honkerinvalidator})
591
592func shortname(userid int64, xid string) string {
593 var m map[string]string
594 ok := shortnames.Get(userid, &m)
595 if ok {
596 return m[xid]
597 }
598 return ""
599}
600
601var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
602 honkers := gethonkers(userid)
603 m := make(map[string]string)
604 for _, h := range honkers {
605 m[h.Name] = h.XID
606 }
607 return m, true
608}, Invalidator: &honkerinvalidator})
609
610func fullname(name string, userid int64) string {
611 var m map[string]string
612 ok := fullnames.Get(userid, &m)
613 if ok {
614 return m[name]
615 }
616 return ""
617}
618
619func attoreplacer(m string) string {
620 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
621 where := gofish(m)
622 if where == "" {
623 return m
624 }
625 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
626 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
627}
628
629func ontoreplacer(h string) string {
630 return fmt.Sprintf(`<a class="mention hashtag" href="https://%s/o/%s">%s</a>`, serverName,
631 strings.ToLower(h[1:]), h)
632}
633
634var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
635var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
636
637func originate(u string) string {
638 m := re_urlhost.FindStringSubmatch(u)
639 if len(m) > 1 {
640 return m[1]
641 }
642 return ""
643}
644
645var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
646 handle := getxonker(xid, "handle")
647 if handle == "" {
648 dlog.Printf("need to get a handle: %s", xid)
649 info, err := investigate(xid)
650 if err != nil {
651 m := re_unurl.FindStringSubmatch(xid)
652 if len(m) > 2 {
653 handle = m[2]
654 } else {
655 handle = xid
656 }
657 } else {
658 handle = info.Name
659 }
660 }
661 return handle, true
662}})
663
664// handle, handle@host
665func handles(xid string) (string, string) {
666 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
667 return "", ""
668 }
669 var handle string
670 allhandles.Get(xid, &handle)
671 if handle == xid {
672 return xid, xid
673 }
674 return handle, handle + "@" + originate(xid)
675}
676
677func butnottooloud(aud []string) {
678 for i, a := range aud {
679 if strings.HasSuffix(a, "/followers") {
680 aud[i] = ""
681 }
682 }
683}
684
685func loudandproud(aud []string) bool {
686 for _, a := range aud {
687 if a == thewholeworld {
688 return true
689 }
690 }
691 return false
692}
693
694func firstclass(honk *Honk) bool {
695 return honk.Audience[0] == thewholeworld
696}
697
698func oneofakind(a []string) []string {
699 seen := make(map[string]bool)
700 seen[""] = true
701 j := 0
702 for _, s := range a {
703 if !seen[s] {
704 seen[s] = true
705 a[j] = s
706 j++
707 }
708 }
709 return a[:j]
710}
711
712var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
713 var user *WhatAbout
714 ok := somenumberedusers.Get(userid, &user)
715 if !ok {
716 return nil, false
717 }
718 ki := new(KeyInfo)
719 ki.keyname = user.URL + "#key"
720 ki.seckey = user.SecKey
721 return ki, true
722}})
723
724func ziggy(userid int64) *KeyInfo {
725 var ki *KeyInfo
726 ziggies.Get(userid, &ki)
727 return ki
728}
729
730var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
731 data := getxonker(keyname, "pubkey")
732 if data == "" {
733 dlog.Printf("hitting the webs for missing pubkey: %s", keyname)
734 j, err := GetJunk(readyLuserOne, keyname)
735 if err != nil {
736 ilog.Printf("error getting %s pubkey: %s", keyname, err)
737 when := time.Now().UTC().Format(dbtimeformat)
738 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
739 return httpsig.PublicKey{}, true
740 }
741 allinjest(originate(keyname), j)
742 data = getxonker(keyname, "pubkey")
743 if data == "" {
744 ilog.Printf("key not found after ingesting")
745 when := time.Now().UTC().Format(dbtimeformat)
746 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
747 return httpsig.PublicKey{}, true
748 }
749 }
750 if data == "failed" {
751 ilog.Printf("lookup previously failed key %s", keyname)
752 return httpsig.PublicKey{}, true
753 }
754 _, key, err := httpsig.DecodeKey(data)
755 if err != nil {
756 ilog.Printf("error decoding %s pubkey: %s", keyname, err)
757 return key, true
758 }
759 return key, true
760}, Limit: 512})
761
762func zaggy(keyname string) (httpsig.PublicKey, error) {
763 var key httpsig.PublicKey
764 zaggies.Get(keyname, &key)
765 return key, nil
766}
767
768func savingthrow(keyname string) {
769 when := time.Now().Add(-30 * time.Minute).UTC().Format(dbtimeformat)
770 stmtDeleteXonker.Exec(keyname, "pubkey", when)
771 zaggies.Clear(keyname)
772}
773
774func keymatch(keyname string, actor string) string {
775 origin := originate(actor)
776 if origin == originate(keyname) {
777 return origin
778 }
779 return ""
780}