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_retag.ReplaceAllString(h.Noise, "")
85 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
86 h.Noise = re_cc.ReplaceAllString(h.Noise, "")
87 }
88 h.Username, h.Handle = handles(h.Honker)
89 if !local {
90 short := shortname(userid, h.Honker)
91 if short != "" {
92 h.Username = short
93 } else {
94 h.Username = h.Handle
95 if len(h.Username) > 20 {
96 h.Username = h.Username[:20] + ".."
97 }
98 }
99 }
100 if user != nil {
101 hset := []string{}
102 if h.Honker != user.URL {
103 hset = append(hset, "@"+h.Handle)
104 }
105 if user.Options.MentionAll {
106 for _, a := range h.Audience {
107 if a == h.Honker || a == user.URL {
108 continue
109 }
110 _, hand := handles(a)
111 if hand != "" {
112 hand = "@" + hand
113 hset = append(hset, hand)
114 }
115 }
116 }
117 h.Handles = strings.Join(hset, " ")
118 }
119 if h.URL == "" {
120 h.URL = h.XID
121 }
122 if h.Oonker != "" {
123 _, h.Oondle = handles(h.Oonker)
124 }
125 h.Precis = demoji(h.Precis)
126 h.Noise = demoji(h.Noise)
127 h.Open = "open"
128 var misto string
129 for _, m := range h.Mentions {
130 if m.Where != h.Honker && !m.IsPresent(h.Noise) {
131 misto += " " + m.Who
132 }
133 }
134 var mistag string
135 for _, o := range h.Onts {
136 if !OntIsPresent(o, h.Noise) {
137 mistag += " " + o
138 }
139 }
140 if len(misto) > 0 || len(mistag) > 0 {
141 if len(misto) > 0 {
142 misto = "(" + misto[1:] + ")<p>"
143 }
144 if len(mistag) > 0 {
145 mistag = "<p>(" + mistag[1:] + ")"
146 }
147 h.Noise = misto + h.Noise + mistag
148 }
149
150 zap := make(map[string]bool)
151 {
152 var htf htfilter.Filter
153 htf.Imager = replaceimgsand(zap, false)
154 htf.SpanClasses = allowedclasses
155 htf.BaseURL, _ = url.Parse(h.XID)
156 emuxifier := func(e string) string {
157 for _, d := range h.Donks {
158 if d.Name == e {
159 zap[d.XID] = true
160 if d.Local {
161 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
162 }
163 }
164 }
165 if local && h.What != "bonked" {
166 emu, _ := emucache.Get(e)
167 if emu != nil {
168 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
169 }
170 }
171 return e
172 }
173 htf.FilterText = func(w io.Writer, data string) {
174 data = htfilter.EscapeText(data)
175 data = re_emus.ReplaceAllStringFunc(data, emuxifier)
176 io.WriteString(w, data)
177 }
178 if user != nil {
179 htf.RetargetLink = func(href string) string {
180 h2 := strings.ReplaceAll(href, "/@", "/users/")
181 for _, m := range h.Mentions {
182 if h2 == m.Where || href == m.Where {
183 return "/h?xid=" + url.QueryEscape(m.Where)
184 }
185 }
186 return href
187 }
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 = serverURL("")
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 emu, _ := emucache.Get(e)
269 if emu != nil {
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 var marker mz.Marker
331 marker.Short = true
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 marker.AllowImages = true
347 noise = strings.TrimSpace(noise)
348 noise = marker.Mark(noise)
349 honk.Noise = noise
350 honk.Onts = oneofakind(append(honk.Onts, marker.HashTags...))
351 honk.Mentions = bunchofgrapes(marker.Mentions)
352}
353
354func redoimages(honk *Honk) {
355 zap := make(map[string]bool)
356 {
357 var htf htfilter.Filter
358 htf.Imager = replaceimgsand(zap, true)
359 htf.SpanClasses = allowedclasses
360 p, _ := htf.String(honk.Precis)
361 n, _ := htf.String(honk.Noise)
362 honk.Precis = string(p)
363 honk.Noise = string(n)
364 }
365 j := 0
366 for i := 0; i < len(honk.Donks); i++ {
367 if !zap[honk.Donks[i].XID] {
368 honk.Donks[j] = honk.Donks[i]
369 j++
370 }
371 }
372 honk.Donks = honk.Donks[:j]
373
374 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
375 honk.Noise = re_retag.ReplaceAllString(honk.Noise, "")
376 honk.Noise = re_cc.ReplaceAllString(honk.Noise, "")
377 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
378}
379
380func xcelerate(b []byte) string {
381 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
382 for i, c := range b {
383 b[i] = letters[c&63]
384 }
385 s := string(b)
386 return s
387}
388
389func shortxid(xid string) string {
390 h := sha512.New512_256()
391 io.WriteString(h, xid)
392 return xcelerate(h.Sum(nil)[:20])
393}
394
395func xfiltrate() string {
396 var b [18]byte
397 rand.Read(b[:])
398 return xcelerate(b[:])
399}
400
401func grapevine(mentions []Mention) []string {
402 var s []string
403 for _, m := range mentions {
404 s = append(s, m.Where)
405 }
406 return s
407}
408
409func bunchofgrapes(m []string) []Mention {
410 var mentions []Mention
411 for i := range m {
412 who := m[i]
413 if strings.HasPrefix(who, "@https://") {
414 mentions = append(mentions, Mention{Who: who, Where: who[1:]})
415 continue
416 }
417 where := gofish(who)
418 if where != "" {
419 mentions = append(mentions, Mention{Who: who, Where: where})
420 }
421 }
422 return mentions
423}
424
425type Emu struct {
426 ID string
427 Name string
428 Type string
429}
430
431var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
432
433var emucache = gencache.New(gencache.Options[string, *Emu]{Fill: func(ename string) (*Emu, bool) {
434 fname := ename[1 : len(ename)-1]
435 exts := []string{".png", ".gif"}
436 for _, ext := range exts {
437 _, err := os.Stat(dataDir + "/emus/" + fname + ext)
438 if err != nil {
439 continue
440 }
441 url := serverURL("/emu/%s%s", fname, ext)
442 if develMode {
443 url = fmt.Sprintf("/emu/%s%s", fname, ext)
444 }
445 return &Emu{ID: url, Name: ename, Type: "image/" + ext[1:]}, true
446 }
447 return nil, true
448}, Duration: 10 * time.Second})
449
450func herdofemus(noise string) []*Emu {
451 m := re_emus.FindAllString(noise, -1)
452 m = oneofakind(m)
453 var emus []*Emu
454 for _, e := range m {
455 emu, _ := emucache.Get(e)
456 if emu == nil {
457 continue
458 }
459 emus = append(emus, emu)
460 }
461 return emus
462}
463
464var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
465var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
466var re_banner = regexp.MustCompile("banner: ?([^\n]+)")
467var re_convoy = regexp.MustCompile("convoy: ?([^\n]+)")
468var re_retag = regexp.MustCompile("tags: ?([^\n]+)")
469var re_cc = regexp.MustCompile("cc: ?([^\n]+)")
470var re_link = regexp.MustCompile("link: ?([^\n]+)")
471var re_convalidate = regexp.MustCompile("^(https?|tag|data):")
472
473func memetize(honk *Honk) {
474 repl := func(x string) string {
475 name := x[5:]
476 if name[0] == ' ' {
477 name = name[1:]
478 }
479 fd, err := os.Open(dataDir + "/memes/" + name)
480 if err != nil {
481 ilog.Printf("no meme for %s", name)
482 return x
483 }
484 var peek [512]byte
485 n, _ := fd.Read(peek[:])
486 ct := http.DetectContentType(peek[:n])
487 fd.Close()
488
489 url := serverURL("/meme/%s", name)
490 fileid, err := savefile(name, name, url, ct, false, nil)
491 if err != nil {
492 elog.Printf("error saving meme: %s", err)
493 return x
494 }
495 d := &Donk{
496 FileID: fileid,
497 Name: name,
498 Media: ct,
499 URL: url,
500 Local: false,
501 }
502 honk.Donks = append(honk.Donks, d)
503 return ""
504 }
505 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
506}
507
508func recategorize(honk *Honk) {
509 repl := func(x string) string {
510 x = x[5:]
511 for _, t := range strings.Split(x, " ") {
512 if t == "" {
513 continue
514 }
515 if t[0] != '#' {
516 t = "#" + t
517 }
518 dlog.Printf("hashtag: %s", t)
519 honk.Onts = append(honk.Onts, t)
520 }
521 return ""
522 }
523 honk.Noise = re_retag.ReplaceAllStringFunc(honk.Noise, repl)
524}
525
526var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]_]+([ \n:;.,']|$)")
527
528func quickrename(s string, userid int64) string {
529 nonstop := true
530 for nonstop {
531 nonstop = false
532 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
533 prefix := ""
534 if m[0] == ' ' || m[0] == '\n' {
535 prefix = m[:1]
536 m = m[1:]
537 }
538 prefix += "@"
539 m = m[1:]
540 tail := ""
541 if last := m[len(m)-1]; last == ' ' || last == '\n' ||
542 last == ':' || last == ';' ||
543 last == '.' || last == ',' || last == '\'' {
544 tail = m[len(m)-1:]
545 m = m[:len(m)-1]
546 }
547
548 xid := fullname(m, userid)
549
550 if xid != "" {
551 _, name := handles(xid)
552 if name != "" {
553 nonstop = true
554 m = name
555 }
556 }
557 return prefix + m + tail
558 })
559 }
560 return s
561}
562
563var shortnames = 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.XID] = h.Name
568 }
569 return m, true
570}, Invalidator: &honkerinvalidator})
571
572func shortname(userid int64, xid string) string {
573 m, ok := shortnames.Get(userid)
574 if ok {
575 return m[xid]
576 }
577 return ""
578}
579
580var fullnames = gencache.New(gencache.Options[int64, map[string]string]{Fill: func(userid int64) (map[string]string, bool) {
581 honkers := gethonkers(userid)
582 m := make(map[string]string)
583 for _, h := range honkers {
584 m[h.Name] = h.XID
585 }
586 return m, true
587}, Invalidator: &honkerinvalidator})
588
589func fullname(name string, userid int64) string {
590 m, ok := fullnames.Get(userid)
591 if ok {
592 return m[name]
593 }
594 return ""
595}
596
597func attoreplacer(m string) string {
598 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
599 if strings.HasPrefix(m, "@https://") {
600 return fmt.Sprintf(fill, html.EscapeString(m[1:]), html.EscapeString(m))
601 }
602 where := gofish(m)
603 if where == "" {
604 return m
605 }
606 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
607 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
608}
609
610func ontoreplacer(h string) string {
611 return fmt.Sprintf(`<a class="mention hashtag" href="%s">%s</a>`,
612 serverURL("/o/%s", strings.ToLower(h[1:])), h)
613}
614
615var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
616var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
617
618func originate(u string) string {
619 m := re_urlhost.FindStringSubmatch(u)
620 if len(m) > 1 {
621 return m[1]
622 }
623 return ""
624}
625
626var allhandles = gencache.New(gencache.Options[string, string]{Fill: func(xid string) (string, bool) {
627 handle := getxonker(xid, "handle")
628 if handle == "" {
629 dlog.Printf("need to get a handle: %s", xid)
630 info, err := investigate(xid)
631 if err != nil {
632 m := re_unurl.FindStringSubmatch(xid)
633 if len(m) > 2 {
634 handle = m[2]
635 } else {
636 handle = xid
637 }
638 } else {
639 handle = info.Name
640 }
641 }
642 return handle, true
643}})
644
645// handle, handle@host
646func handles(xid string) (string, string) {
647 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
648 return "", ""
649 }
650 handle, _ := allhandles.Get(xid)
651 if handle == xid {
652 return xid, xid
653 }
654 return handle, handle + "@" + originate(xid)
655}
656
657func butnottooloud(aud []string) {
658 for i, a := range aud {
659 if strings.HasSuffix(a, "/followers") {
660 aud[i] = ""
661 }
662 }
663}
664
665func loudandproud(aud []string) bool {
666 for _, a := range aud {
667 if a == thewholeworld {
668 return true
669 }
670 }
671 return false
672}
673
674func firstclass(honk *Honk) bool {
675 return honk.Audience[0] == thewholeworld
676}
677
678func oneofakind(a []string) []string {
679 seen := make(map[string]bool)
680 seen[""] = true
681 j := 0
682 for _, s := range a {
683 if !seen[s] {
684 seen[s] = true
685 a[j] = s
686 j++
687 }
688 }
689 return a[:j]
690}
691
692var ziggies = gencache.New(gencache.Options[int64, *KeyInfo]{Fill: func(userid int64) (*KeyInfo, bool) {
693 user, ok := somenumberedusers.Get(userid)
694 if !ok {
695 return nil, false
696 }
697 ki := new(KeyInfo)
698 ki.keyname = user.URL + "#key"
699 ki.seckey = user.SecKey
700 return ki, true
701}})
702
703func ziggy(userid int64) *KeyInfo {
704 ki, _ := ziggies.Get(userid)
705 return ki
706}
707
708var zaggies = gencache.New(gencache.Options[string, httpsig.PublicKey]{Fill: func(keyname string) (httpsig.PublicKey, bool) {
709 data := getxonker(keyname, "pubkey")
710 if data == "" {
711 dlog.Printf("hitting the webs for missing pubkey: %s", keyname)
712 j, err := GetJunk(readyLuserOne, keyname)
713 if err != nil {
714 ilog.Printf("error getting %s pubkey: %s", keyname, err)
715 when := time.Now().UTC().Format(dbtimeformat)
716 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
717 return httpsig.PublicKey{}, true
718 }
719 allinjest(originate(keyname), j)
720 data = getxonker(keyname, "pubkey")
721 if data == "" {
722 ilog.Printf("key not found after ingesting")
723 when := time.Now().UTC().Format(dbtimeformat)
724 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
725 return httpsig.PublicKey{}, true
726 }
727 }
728 if data == "failed" {
729 ilog.Printf("lookup previously failed key %s", keyname)
730 return httpsig.PublicKey{}, true
731 }
732 _, key, err := httpsig.DecodeKey(data)
733 if err != nil {
734 ilog.Printf("error decoding %s pubkey: %s", keyname, err)
735 return key, true
736 }
737 return key, true
738}, Limit: 512})
739
740func zaggy(keyname string) (httpsig.PublicKey, error) {
741 key, _ := zaggies.Get(keyname)
742 return key, nil
743}
744
745func savingthrow(keyname string) {
746 when := time.Now().Add(-30 * time.Minute).UTC().Format(dbtimeformat)
747 stmtDeleteXonker.Exec(keyname, "pubkey", when)
748 zaggies.Clear(keyname)
749}
750
751func keymatch(keyname string, actor string) string {
752 origin := originate(actor)
753 if origin == originate(keyname) {
754 return origin
755 }
756 return ""
757}