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 == "tonked" {
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 if user.Options.MentionAll {
101 hset := []string{"@" + h.Handle}
102 for _, a := range h.Audience {
103 if a == h.Honker || a == user.URL {
104 continue
105 }
106 _, hand := handles(a)
107 if hand != "" {
108 hand = "@" + hand
109 hset = append(hset, hand)
110 }
111 }
112 h.Handles = strings.Join(hset, " ")
113 } else if h.Honker != user.URL {
114 h.Handles = "@" + h.Handle
115 }
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 for _, m := range h.Mentions {
127 if !m.IsPresent(h.Noise) {
128 h.Noise = "(" + m.Who + ")" + h.Noise
129 }
130 }
131
132 zap := make(map[string]bool)
133 {
134 var htf htfilter.Filter
135 htf.Imager = replaceimgsand(zap, false)
136 htf.SpanClasses = allowedclasses
137 htf.BaseURL, _ = url.Parse(h.XID)
138 emuxifier := func(e string) string {
139 for _, d := range h.Donks {
140 if d.Name == e {
141 zap[d.XID] = true
142 if d.Local {
143 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
144 }
145 }
146 }
147 if local && h.What != "bonked" {
148 var emu Emu
149 emucache.Get(e, &emu)
150 if emu.ID != "" {
151 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
152 }
153 }
154 return e
155 }
156 htf.FilterText = func(w io.Writer, data string) {
157 data = htfilter.EscapeText(data)
158 data = re_emus.ReplaceAllStringFunc(data, emuxifier)
159 io.WriteString(w, data)
160 }
161 p, _ := htf.String(h.Precis)
162 n, _ := htf.String(h.Noise)
163 h.Precis = string(p)
164 h.Noise = string(n)
165 }
166 j := 0
167 for i := 0; i < len(h.Donks); i++ {
168 if !zap[h.Donks[i].XID] {
169 h.Donks[j] = h.Donks[i]
170 j++
171 }
172 }
173 h.Donks = h.Donks[:j]
174 }
175
176 unsee(honks, userid)
177
178 for _, h := range honks {
179 renderflags(h)
180
181 h.HTPrecis = template.HTML(h.Precis)
182 h.HTML = template.HTML(h.Noise)
183 if h.What == "wonked" {
184 h.HTML = "? wonk ?"
185 }
186 if redo := relingo[h.What]; redo != "" {
187 h.What = redo
188 }
189 }
190}
191
192func replaceimgsand(zap map[string]bool, absolute bool) func(node *html.Node) string {
193 return func(node *html.Node) string {
194 src := htfilter.GetAttr(node, "src")
195 alt := htfilter.GetAttr(node, "alt")
196 //title := GetAttr(node, "title")
197 if htfilter.HasClass(node, "Emoji") && alt != "" {
198 return alt
199 }
200 d := finddonk(src)
201 if d != nil {
202 zap[d.XID] = true
203 base := ""
204 if absolute {
205 base = "https://" + serverName
206 }
207 return string(templates.Sprintf(`<img alt="%s" title="%s" src="%s/d/%s">`, alt, alt, base, d.XID))
208 }
209 return string(templates.Sprintf(`<img alt="%s" src="<a href="%s">%s</a>">`, alt, src, src))
210 }
211}
212
213func translatechonk(ch *Chonk) {
214 noise := ch.Noise
215 if ch.Format == "markdown" {
216 noise = markitzero(noise)
217 }
218 var htf htfilter.Filter
219 htf.SpanClasses = allowedclasses
220 htf.BaseURL, _ = url.Parse(ch.XID)
221 ch.HTML, _ = htf.String(noise)
222}
223
224func filterchonk(ch *Chonk) {
225 translatechonk(ch)
226
227 noise := string(ch.HTML)
228
229 local := originate(ch.XID) == serverName
230
231 zap := make(map[string]bool)
232 emuxifier := func(e string) string {
233 for _, d := range ch.Donks {
234 if d.Name == e {
235 zap[d.XID] = true
236 if d.Local {
237 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
238 }
239 }
240 }
241 if local {
242 var emu Emu
243 emucache.Get(e, &emu)
244 if emu.ID != "" {
245 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
246 }
247 }
248 return e
249 }
250 noise = re_emus.ReplaceAllStringFunc(noise, emuxifier)
251 j := 0
252 for i := 0; i < len(ch.Donks); i++ {
253 if !zap[ch.Donks[i].XID] {
254 ch.Donks[j] = ch.Donks[i]
255 j++
256 }
257 }
258 ch.Donks = ch.Donks[:j]
259
260 if strings.HasPrefix(noise, "<p>") {
261 noise = noise[3:]
262 }
263 ch.HTML = template.HTML(noise)
264 if short := shortname(ch.UserID, ch.Who); short != "" {
265 ch.Handle = short
266 } else {
267 ch.Handle, _ = handles(ch.Who)
268 }
269
270}
271
272func inlineimgsfor(honk *Honk) func(node *html.Node) string {
273 return func(node *html.Node) string {
274 src := htfilter.GetAttr(node, "src")
275 alt := htfilter.GetAttr(node, "alt")
276 d := savedonk(src, "image", alt, "image", true)
277 if d != nil {
278 honk.Donks = append(honk.Donks, d)
279 }
280 dlog.Printf("inline img with src: %s", src)
281 return ""
282 }
283}
284
285func imaginate(honk *Honk) {
286 var htf htfilter.Filter
287 htf.Imager = inlineimgsfor(honk)
288 htf.BaseURL, _ = url.Parse(honk.XID)
289 htf.String(honk.Noise)
290}
291
292func translate(honk *Honk) {
293 if honk.Format == "html" {
294 return
295 }
296 noise := honk.Noise
297 if strings.HasPrefix(noise, "DZ:") {
298 idx := strings.Index(noise, "\n")
299 if idx == -1 {
300 honk.Precis = noise
301 noise = ""
302 } else {
303 honk.Precis = noise[:idx]
304 noise = noise[idx+1:]
305 }
306 }
307 honk.Precis = markitzero(strings.TrimSpace(honk.Precis))
308
309 var marker mz.Marker
310 marker.HashLinker = ontoreplacer
311 marker.AtLinker = attoreplacer
312 noise = strings.TrimSpace(noise)
313 noise = marker.Mark(noise)
314 honk.Noise = noise
315 honk.Onts = oneofakind(marker.HashTags)
316 honk.Mentions = bunchofgrapes(marker.Mentions)
317}
318
319func redoimages(honk *Honk) {
320 zap := make(map[string]bool)
321 {
322 var htf htfilter.Filter
323 htf.Imager = replaceimgsand(zap, true)
324 htf.SpanClasses = allowedclasses
325 p, _ := htf.String(honk.Precis)
326 n, _ := htf.String(honk.Noise)
327 honk.Precis = string(p)
328 honk.Noise = string(n)
329 }
330 j := 0
331 for i := 0; i < len(honk.Donks); i++ {
332 if !zap[honk.Donks[i].XID] {
333 honk.Donks[j] = honk.Donks[i]
334 j++
335 }
336 }
337 honk.Donks = honk.Donks[:j]
338
339 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
340 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
341}
342
343func xcelerate(b []byte) string {
344 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
345 for i, c := range b {
346 b[i] = letters[c&63]
347 }
348 s := string(b)
349 return s
350}
351
352func shortxid(xid string) string {
353 h := sha512.New512_256()
354 io.WriteString(h, xid)
355 return xcelerate(h.Sum(nil)[:20])
356}
357
358func xfiltrate() string {
359 var b [18]byte
360 rand.Read(b[:])
361 return xcelerate(b[:])
362}
363
364func grapevine(mentions []Mention) []string {
365 var s []string
366 for _, m := range mentions {
367 s = append(s, m.Where)
368 }
369 return s
370}
371
372func bunchofgrapes(m []string) []Mention {
373 var mentions []Mention
374 for i := range m {
375 where := gofish(m[i])
376 if where != "" {
377 mentions = append(mentions, Mention{Who: m[i], Where: where})
378 }
379 }
380 return mentions
381}
382
383type Emu struct {
384 ID string
385 Name string
386 Type string
387}
388
389var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
390
391var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
392 fname := ename[1 : len(ename)-1]
393 exts := []string{".png", ".gif"}
394 for _, ext := range exts {
395 _, err := os.Stat(dataDir + "/emus/" + fname + ext)
396 if err != nil {
397 continue
398 }
399 url := fmt.Sprintf("https://%s/emu/%s%s", serverName, fname, ext)
400 return Emu{ID: url, Name: ename, Type: "image/" + ext[1:]}, true
401 }
402 return Emu{Name: ename, ID: "", Type: "image/png"}, true
403}, Duration: 10 * time.Second})
404
405func herdofemus(noise string) []Emu {
406 m := re_emus.FindAllString(noise, -1)
407 m = oneofakind(m)
408 var emus []Emu
409 for _, e := range m {
410 var emu Emu
411 emucache.Get(e, &emu)
412 if emu.ID == "" {
413 continue
414 }
415 emus = append(emus, emu)
416 }
417 return emus
418}
419
420var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
421var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
422
423func memetize(honk *Honk) {
424 repl := func(x string) string {
425 name := x[5:]
426 if name[0] == ' ' {
427 name = name[1:]
428 }
429 fd, err := os.Open(dataDir + "/memes/" + name)
430 if err != nil {
431 ilog.Printf("no meme for %s", name)
432 return x
433 }
434 var peek [512]byte
435 n, _ := fd.Read(peek[:])
436 ct := http.DetectContentType(peek[:n])
437 fd.Close()
438
439 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
440 fileid, err := savefile(name, name, url, ct, false, nil)
441 if err != nil {
442 elog.Printf("error saving meme: %s", err)
443 return x
444 }
445 d := &Donk{
446 FileID: fileid,
447 Name: name,
448 Media: ct,
449 URL: url,
450 Local: false,
451 }
452 honk.Donks = append(honk.Donks, d)
453 return ""
454 }
455 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
456}
457
458var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n.]|$)")
459
460func quickrename(s string, userid int64) string {
461 nonstop := true
462 for nonstop {
463 nonstop = false
464 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
465 prefix := ""
466 if m[0] == ' ' || m[0] == '\n' {
467 prefix = m[:1]
468 m = m[1:]
469 }
470 prefix += "@"
471 m = m[1:]
472 tail := ""
473 if last := m[len(m)-1]; last == ' ' || last == '\n' || last == '.' {
474 tail = m[len(m)-1:]
475 m = m[:len(m)-1]
476 }
477
478 xid := fullname(m, userid)
479
480 if xid != "" {
481 _, name := handles(xid)
482 if name != "" {
483 nonstop = true
484 m = name
485 }
486 }
487 return prefix + m + tail
488 })
489 }
490 return s
491}
492
493var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
494 honkers := gethonkers(userid)
495 m := make(map[string]string)
496 for _, h := range honkers {
497 m[h.XID] = h.Name
498 }
499 return m, true
500}, Invalidator: &honkerinvalidator})
501
502func shortname(userid int64, xid string) string {
503 var m map[string]string
504 ok := shortnames.Get(userid, &m)
505 if ok {
506 return m[xid]
507 }
508 return ""
509}
510
511var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
512 honkers := gethonkers(userid)
513 m := make(map[string]string)
514 for _, h := range honkers {
515 m[h.Name] = h.XID
516 }
517 return m, true
518}, Invalidator: &honkerinvalidator})
519
520func fullname(name string, userid int64) string {
521 var m map[string]string
522 ok := fullnames.Get(userid, &m)
523 if ok {
524 return m[name]
525 }
526 return ""
527}
528
529func attoreplacer(m string) string {
530 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
531 where := gofish(m)
532 if where == "" {
533 return m
534 }
535 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
536 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
537}
538
539func ontoreplacer(h string) string {
540 return fmt.Sprintf(`<a href="https://%s/o/%s">%s</a>`, serverName,
541 strings.ToLower(h[1:]), h)
542}
543
544var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
545var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
546
547func originate(u string) string {
548 m := re_urlhost.FindStringSubmatch(u)
549 if len(m) > 1 {
550 return m[1]
551 }
552 return ""
553}
554
555var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
556 handle := getxonker(xid, "handle")
557 if handle == "" {
558 dlog.Printf("need to get a handle: %s", xid)
559 info, err := investigate(xid)
560 if err != nil {
561 m := re_unurl.FindStringSubmatch(xid)
562 if len(m) > 2 {
563 handle = m[2]
564 } else {
565 handle = xid
566 }
567 } else {
568 handle = info.Name
569 }
570 }
571 return handle, true
572}})
573
574// handle, handle@host
575func handles(xid string) (string, string) {
576 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
577 return "", ""
578 }
579 var handle string
580 allhandles.Get(xid, &handle)
581 if handle == xid {
582 return xid, xid
583 }
584 return handle, handle + "@" + originate(xid)
585}
586
587func butnottooloud(aud []string) {
588 for i, a := range aud {
589 if strings.HasSuffix(a, "/followers") {
590 aud[i] = ""
591 }
592 }
593}
594
595func loudandproud(aud []string) bool {
596 for _, a := range aud {
597 if a == thewholeworld {
598 return true
599 }
600 }
601 return false
602}
603
604func firstclass(honk *Honk) bool {
605 return honk.Audience[0] == thewholeworld
606}
607
608func oneofakind(a []string) []string {
609 seen := make(map[string]bool)
610 seen[""] = true
611 j := 0
612 for _, s := range a {
613 if !seen[s] {
614 seen[s] = true
615 a[j] = s
616 j++
617 }
618 }
619 return a[:j]
620}
621
622var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
623 var user *WhatAbout
624 ok := somenumberedusers.Get(userid, &user)
625 if !ok {
626 return nil, false
627 }
628 ki := new(KeyInfo)
629 ki.keyname = user.URL + "#key"
630 ki.seckey = user.SecKey
631 return ki, true
632}})
633
634func ziggy(userid int64) *KeyInfo {
635 var ki *KeyInfo
636 ziggies.Get(userid, &ki)
637 return ki
638}
639
640var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
641 data := getxonker(keyname, "pubkey")
642 if data == "" {
643 dlog.Printf("hitting the webs for missing pubkey: %s", keyname)
644 j, err := GetJunk(serverUID, keyname)
645 if err != nil {
646 ilog.Printf("error getting %s pubkey: %s", keyname, err)
647 when := time.Now().UTC().Format(dbtimeformat)
648 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
649 return httpsig.PublicKey{}, true
650 }
651 allinjest(originate(keyname), j)
652 data = getxonker(keyname, "pubkey")
653 if data == "" {
654 ilog.Printf("key not found after ingesting")
655 when := time.Now().UTC().Format(dbtimeformat)
656 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
657 return httpsig.PublicKey{}, true
658 }
659 }
660 if data == "failed" {
661 ilog.Printf("lookup previously failed key %s", keyname)
662 return httpsig.PublicKey{}, true
663 }
664 _, key, err := httpsig.DecodeKey(data)
665 if err != nil {
666 ilog.Printf("error decoding %s pubkey: %s", keyname, err)
667 return key, true
668 }
669 return key, true
670}, Limit: 512})
671
672func zaggy(keyname string) (httpsig.PublicKey, error) {
673 var key httpsig.PublicKey
674 zaggies.Get(keyname, &key)
675 return key, nil
676}
677
678func savingthrow(keyname string) {
679 when := time.Now().Add(-30 * time.Minute).UTC().Format(dbtimeformat)
680 stmtDeleteXonker.Exec(keyname, "pubkey", when)
681 zaggies.Clear(keyname)
682}
683
684func keymatch(keyname string, actor string) string {
685 hash := strings.IndexByte(keyname, '#')
686 if hash == -1 {
687 hash = len(keyname)
688 }
689 owner := keyname[0:hash]
690 if owner == actor {
691 return originate(actor)
692 }
693 return ""
694}