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