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]+)")
422var re_banner = regexp.MustCompile("banner: ?([^\n]+)")
423
424func memetize(honk *Honk) {
425 repl := func(x string) string {
426 name := x[5:]
427 if name[0] == ' ' {
428 name = name[1:]
429 }
430 fd, err := os.Open(dataDir + "/memes/" + name)
431 if err != nil {
432 ilog.Printf("no meme for %s", name)
433 return x
434 }
435 var peek [512]byte
436 n, _ := fd.Read(peek[:])
437 ct := http.DetectContentType(peek[:n])
438 fd.Close()
439
440 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
441 fileid, err := savefile(name, name, url, ct, false, nil)
442 if err != nil {
443 elog.Printf("error saving meme: %s", err)
444 return x
445 }
446 d := &Donk{
447 FileID: fileid,
448 Name: name,
449 Media: ct,
450 URL: url,
451 Local: false,
452 }
453 honk.Donks = append(honk.Donks, d)
454 return ""
455 }
456 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
457}
458
459var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n.]|$)")
460
461func quickrename(s string, userid int64) string {
462 nonstop := true
463 for nonstop {
464 nonstop = false
465 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
466 prefix := ""
467 if m[0] == ' ' || m[0] == '\n' {
468 prefix = m[:1]
469 m = m[1:]
470 }
471 prefix += "@"
472 m = m[1:]
473 tail := ""
474 if last := m[len(m)-1]; last == ' ' || last == '\n' || last == '.' {
475 tail = m[len(m)-1:]
476 m = m[:len(m)-1]
477 }
478
479 xid := fullname(m, userid)
480
481 if xid != "" {
482 _, name := handles(xid)
483 if name != "" {
484 nonstop = true
485 m = name
486 }
487 }
488 return prefix + m + tail
489 })
490 }
491 return s
492}
493
494var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
495 honkers := gethonkers(userid)
496 m := make(map[string]string)
497 for _, h := range honkers {
498 m[h.XID] = h.Name
499 }
500 return m, true
501}, Invalidator: &honkerinvalidator})
502
503func shortname(userid int64, xid string) string {
504 var m map[string]string
505 ok := shortnames.Get(userid, &m)
506 if ok {
507 return m[xid]
508 }
509 return ""
510}
511
512var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
513 honkers := gethonkers(userid)
514 m := make(map[string]string)
515 for _, h := range honkers {
516 m[h.Name] = h.XID
517 }
518 return m, true
519}, Invalidator: &honkerinvalidator})
520
521func fullname(name string, userid int64) string {
522 var m map[string]string
523 ok := fullnames.Get(userid, &m)
524 if ok {
525 return m[name]
526 }
527 return ""
528}
529
530func attoreplacer(m string) string {
531 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
532 where := gofish(m)
533 if where == "" {
534 return m
535 }
536 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
537 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
538}
539
540func ontoreplacer(h string) string {
541 return fmt.Sprintf(`<a href="https://%s/o/%s">%s</a>`, serverName,
542 strings.ToLower(h[1:]), h)
543}
544
545var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
546var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
547
548func originate(u string) string {
549 m := re_urlhost.FindStringSubmatch(u)
550 if len(m) > 1 {
551 return m[1]
552 }
553 return ""
554}
555
556var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
557 handle := getxonker(xid, "handle")
558 if handle == "" {
559 dlog.Printf("need to get a handle: %s", xid)
560 info, err := investigate(xid)
561 if err != nil {
562 m := re_unurl.FindStringSubmatch(xid)
563 if len(m) > 2 {
564 handle = m[2]
565 } else {
566 handle = xid
567 }
568 } else {
569 handle = info.Name
570 }
571 }
572 return handle, true
573}})
574
575// handle, handle@host
576func handles(xid string) (string, string) {
577 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
578 return "", ""
579 }
580 var handle string
581 allhandles.Get(xid, &handle)
582 if handle == xid {
583 return xid, xid
584 }
585 return handle, handle + "@" + originate(xid)
586}
587
588func butnottooloud(aud []string) {
589 for i, a := range aud {
590 if strings.HasSuffix(a, "/followers") {
591 aud[i] = ""
592 }
593 }
594}
595
596func loudandproud(aud []string) bool {
597 for _, a := range aud {
598 if a == thewholeworld {
599 return true
600 }
601 }
602 return false
603}
604
605func firstclass(honk *Honk) bool {
606 return honk.Audience[0] == thewholeworld
607}
608
609func oneofakind(a []string) []string {
610 seen := make(map[string]bool)
611 seen[""] = true
612 j := 0
613 for _, s := range a {
614 if !seen[s] {
615 seen[s] = true
616 a[j] = s
617 j++
618 }
619 }
620 return a[:j]
621}
622
623var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
624 var user *WhatAbout
625 ok := somenumberedusers.Get(userid, &user)
626 if !ok {
627 return nil, false
628 }
629 ki := new(KeyInfo)
630 ki.keyname = user.URL + "#key"
631 ki.seckey = user.SecKey
632 return ki, true
633}})
634
635func ziggy(userid int64) *KeyInfo {
636 var ki *KeyInfo
637 ziggies.Get(userid, &ki)
638 return ki
639}
640
641var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
642 data := getxonker(keyname, "pubkey")
643 if data == "" {
644 dlog.Printf("hitting the webs for missing pubkey: %s", keyname)
645 j, err := GetJunk(serverUID, keyname)
646 if err != nil {
647 ilog.Printf("error getting %s pubkey: %s", keyname, err)
648 when := time.Now().UTC().Format(dbtimeformat)
649 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
650 return httpsig.PublicKey{}, true
651 }
652 allinjest(originate(keyname), j)
653 data = getxonker(keyname, "pubkey")
654 if data == "" {
655 ilog.Printf("key not found after ingesting")
656 when := time.Now().UTC().Format(dbtimeformat)
657 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
658 return httpsig.PublicKey{}, true
659 }
660 }
661 if data == "failed" {
662 ilog.Printf("lookup previously failed key %s", keyname)
663 return httpsig.PublicKey{}, true
664 }
665 _, key, err := httpsig.DecodeKey(data)
666 if err != nil {
667 ilog.Printf("error decoding %s pubkey: %s", keyname, err)
668 return key, true
669 }
670 return key, true
671}, Limit: 512})
672
673func zaggy(keyname string) (httpsig.PublicKey, error) {
674 var key httpsig.PublicKey
675 zaggies.Get(keyname, &key)
676 return key, nil
677}
678
679func savingthrow(keyname string) {
680 when := time.Now().Add(-30 * time.Minute).UTC().Format(dbtimeformat)
681 stmtDeleteXonker.Exec(keyname, "pubkey", when)
682 zaggies.Clear(keyname)
683}
684
685func keymatch(keyname string, actor string) string {
686 hash := strings.IndexByte(keyname, '#')
687 if hash == -1 {
688 hash = len(keyname)
689 }
690 owner := keyname[0:hash]
691 if owner == actor {
692 return originate(actor)
693 }
694 return ""
695}