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 translate(h)
77 local := false
78 if h.Whofore == 2 || h.Whofore == 3 {
79 local = true
80 }
81 if local && h.What != "bonked" {
82 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
83 }
84 h.Username, h.Handle = handles(h.Honker)
85 if !local {
86 short := shortname(userid, h.Honker)
87 if short != "" {
88 h.Username = short
89 } else {
90 h.Username = h.Handle
91 if len(h.Username) > 20 {
92 h.Username = h.Username[:20] + ".."
93 }
94 }
95 }
96 if user != nil {
97 if user.Options.MentionAll {
98 hset := []string{"@" + h.Handle}
99 for _, a := range h.Audience {
100 if a == h.Honker || a == user.URL {
101 continue
102 }
103 _, hand := handles(a)
104 if hand != "" {
105 hand = "@" + hand
106 hset = append(hset, hand)
107 }
108 }
109 h.Handles = strings.Join(hset, " ")
110 } else if h.Honker != user.URL {
111 h.Handles = "@" + h.Handle
112 }
113 }
114 if h.URL == "" {
115 h.URL = h.XID
116 }
117 if h.Oonker != "" {
118 _, h.Oondle = handles(h.Oonker)
119 }
120 h.Precis = demoji(h.Precis)
121 h.Noise = demoji(h.Noise)
122 h.Open = "open"
123
124 zap := make(map[string]bool)
125 {
126 var htf htfilter.Filter
127 htf.Imager = replaceimgsand(zap, false)
128 htf.SpanClasses = allowedclasses
129 htf.BaseURL, _ = url.Parse(h.XID)
130 emuxifier := func(e string) string {
131 for _, d := range h.Donks {
132 if d.Name == e {
133 zap[d.XID] = true
134 if d.Local {
135 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
136 }
137 }
138 }
139 if local && h.What != "bonked" {
140 var emu Emu
141 emucache.Get(e, &emu)
142 if emu.ID != "" {
143 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
144 }
145 }
146 return e
147 }
148 htf.FilterText = func(w io.Writer, data string) {
149 data = htfilter.EscapeText(data)
150 data = re_emus.ReplaceAllStringFunc(data, emuxifier)
151 io.WriteString(w, data)
152 }
153 p, _ := htf.String(h.Precis)
154 n, _ := htf.String(h.Noise)
155 h.Precis = string(p)
156 h.Noise = string(n)
157 }
158 j := 0
159 for i := 0; i < len(h.Donks); i++ {
160 if !zap[h.Donks[i].XID] {
161 h.Donks[j] = h.Donks[i]
162 j++
163 }
164 }
165 h.Donks = h.Donks[:j]
166 }
167
168 unsee(honks, userid)
169
170 for _, h := range honks {
171 renderflags(h)
172
173 h.HTPrecis = template.HTML(h.Precis)
174 h.HTML = template.HTML(h.Noise)
175 if h.What == "wonked" {
176 h.HTML = "? wonk ?"
177 }
178 if redo := relingo[h.What]; redo != "" {
179 h.What = redo
180 }
181 }
182}
183
184func replaceimgsand(zap map[string]bool, absolute bool) func(node *html.Node) string {
185 return func(node *html.Node) string {
186 src := htfilter.GetAttr(node, "src")
187 alt := htfilter.GetAttr(node, "alt")
188 //title := GetAttr(node, "title")
189 if htfilter.HasClass(node, "Emoji") && alt != "" {
190 return alt
191 }
192 d := finddonk(src)
193 if d != nil {
194 zap[d.XID] = true
195 base := ""
196 if absolute {
197 base = "https://" + serverName
198 }
199 return string(templates.Sprintf(`<img alt="%s" title="%s" src="%s/d/%s">`, alt, alt, base, d.XID))
200 }
201 return string(templates.Sprintf(`<img alt="%s" src="<a href="%s">%s</a>">`, alt, src, src))
202 }
203}
204
205func translatechonk(ch *Chonk) {
206 noise := ch.Noise
207 if ch.Format == "markdown" {
208 noise = markitzero(noise)
209 }
210 var htf htfilter.Filter
211 htf.SpanClasses = allowedclasses
212 htf.BaseURL, _ = url.Parse(ch.XID)
213 ch.HTML, _ = htf.String(noise)
214}
215
216func filterchonk(ch *Chonk) {
217 translatechonk(ch)
218
219 noise := string(ch.HTML)
220
221 local := originate(ch.XID) == serverName
222
223 zap := make(map[string]bool)
224 emuxifier := func(e string) string {
225 for _, d := range ch.Donks {
226 if d.Name == e {
227 zap[d.XID] = true
228 if d.Local {
229 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
230 }
231 }
232 }
233 if local {
234 var emu Emu
235 emucache.Get(e, &emu)
236 if emu.ID != "" {
237 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
238 }
239 }
240 return e
241 }
242 noise = re_emus.ReplaceAllStringFunc(noise, emuxifier)
243 j := 0
244 for i := 0; i < len(ch.Donks); i++ {
245 if !zap[ch.Donks[i].XID] {
246 ch.Donks[j] = ch.Donks[i]
247 j++
248 }
249 }
250 ch.Donks = ch.Donks[:j]
251
252 if strings.HasPrefix(noise, "<p>") {
253 noise = noise[3:]
254 }
255 ch.HTML = template.HTML(noise)
256 if short := shortname(ch.UserID, ch.Who); short != "" {
257 ch.Handle = short
258 } else {
259 ch.Handle, _ = handles(ch.Who)
260 }
261
262}
263
264func inlineimgsfor(honk *Honk) func(node *html.Node) string {
265 return func(node *html.Node) string {
266 src := htfilter.GetAttr(node, "src")
267 alt := htfilter.GetAttr(node, "alt")
268 d := savedonk(src, "image", alt, "image", true)
269 if d != nil {
270 honk.Donks = append(honk.Donks, d)
271 }
272 dlog.Printf("inline img with src: %s", src)
273 return ""
274 }
275}
276
277func imaginate(honk *Honk) {
278 var htf htfilter.Filter
279 htf.Imager = inlineimgsfor(honk)
280 htf.BaseURL, _ = url.Parse(honk.XID)
281 htf.String(honk.Noise)
282}
283
284func translate(honk *Honk) {
285 if honk.Format == "html" {
286 return
287 }
288 noise := honk.Noise
289 if strings.HasPrefix(noise, "DZ:") {
290 idx := strings.Index(noise, "\n")
291 if idx == -1 {
292 honk.Precis = noise
293 noise = ""
294 } else {
295 honk.Precis = noise[:idx]
296 noise = noise[idx+1:]
297 }
298 }
299 honk.Precis = markitzero(strings.TrimSpace(honk.Precis))
300
301 var marker mz.Marker
302 marker.HashLinker = ontoreplacer
303 marker.AtLinker = attoreplacer
304 noise = strings.TrimSpace(noise)
305 noise = marker.Mark(noise)
306 honk.Noise = noise
307 honk.Onts = oneofakind(marker.HashTags)
308 honk.Mentions = bunchofgrapes(marker.Mentions)
309}
310
311func redoimages(honk *Honk) {
312 zap := make(map[string]bool)
313 {
314 var htf htfilter.Filter
315 htf.Imager = replaceimgsand(zap, true)
316 htf.SpanClasses = allowedclasses
317 p, _ := htf.String(honk.Precis)
318 n, _ := htf.String(honk.Noise)
319 honk.Precis = string(p)
320 honk.Noise = string(n)
321 }
322 j := 0
323 for i := 0; i < len(honk.Donks); i++ {
324 if !zap[honk.Donks[i].XID] {
325 honk.Donks[j] = honk.Donks[i]
326 j++
327 }
328 }
329 honk.Donks = honk.Donks[:j]
330
331 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
332 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
333}
334
335func xcelerate(b []byte) string {
336 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
337 for i, c := range b {
338 b[i] = letters[c&63]
339 }
340 s := string(b)
341 return s
342}
343
344func shortxid(xid string) string {
345 h := sha512.New512_256()
346 io.WriteString(h, xid)
347 return xcelerate(h.Sum(nil)[:20])
348}
349
350func xfiltrate() string {
351 var b [18]byte
352 rand.Read(b[:])
353 return xcelerate(b[:])
354}
355
356func grapevine(mentions []Mention) []string {
357 var s []string
358 for _, m := range mentions {
359 s = append(s, m.Where)
360 }
361 return s
362}
363
364func bunchofgrapes(m []string) []Mention {
365 var mentions []Mention
366 for i := range m {
367 where := gofish(m[i])
368 if where != "" {
369 mentions = append(mentions, Mention{Who: m[i], Where: where})
370 }
371 }
372 return mentions
373}
374
375type Emu struct {
376 ID string
377 Name string
378}
379
380var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
381
382var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
383 fname := ename[1 : len(ename)-1]
384 _, err := os.Stat(dataDir + "/emus/" + fname + ".png")
385 if err != nil {
386 return Emu{Name: ename, ID: ""}, true
387 }
388 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
389 return Emu{ID: url, Name: ename}, true
390}, Duration: 10 * time.Second})
391
392func herdofemus(noise string) []Emu {
393 m := re_emus.FindAllString(noise, -1)
394 m = oneofakind(m)
395 var emus []Emu
396 for _, e := range m {
397 var emu Emu
398 emucache.Get(e, &emu)
399 if emu.ID == "" {
400 continue
401 }
402 emus = append(emus, emu)
403 }
404 return emus
405}
406
407var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
408var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
409
410func memetize(honk *Honk) {
411 repl := func(x string) string {
412 name := x[5:]
413 if name[0] == ' ' {
414 name = name[1:]
415 }
416 fd, err := os.Open(dataDir + "/memes/" + name)
417 if err != nil {
418 ilog.Printf("no meme for %s", name)
419 return x
420 }
421 var peek [512]byte
422 n, _ := fd.Read(peek[:])
423 ct := http.DetectContentType(peek[:n])
424 fd.Close()
425
426 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
427 fileid, err := savefile(name, name, url, ct, false, nil)
428 if err != nil {
429 elog.Printf("error saving meme: %s", err)
430 return x
431 }
432 d := &Donk{
433 FileID: fileid,
434 Name: name,
435 Media: ct,
436 URL: url,
437 Local: false,
438 }
439 honk.Donks = append(honk.Donks, d)
440 return ""
441 }
442 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
443}
444
445var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n.]|$)")
446
447func quickrename(s string, userid int64) string {
448 nonstop := true
449 for nonstop {
450 nonstop = false
451 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
452 prefix := ""
453 if m[0] == ' ' || m[0] == '\n' {
454 prefix = m[:1]
455 m = m[1:]
456 }
457 prefix += "@"
458 m = m[1:]
459 tail := ""
460 if last := m[len(m)-1]; last == ' ' || last == '\n' || last == '.' {
461 tail = m[len(m)-1:]
462 m = m[:len(m)-1]
463 }
464
465 xid := fullname(m, userid)
466
467 if xid != "" {
468 _, name := handles(xid)
469 if name != "" {
470 nonstop = true
471 m = name
472 }
473 }
474 return prefix + m + tail
475 })
476 }
477 return s
478}
479
480var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
481 honkers := gethonkers(userid)
482 m := make(map[string]string)
483 for _, h := range honkers {
484 m[h.XID] = h.Name
485 }
486 return m, true
487}, Invalidator: &honkerinvalidator})
488
489func shortname(userid int64, xid string) string {
490 var m map[string]string
491 ok := shortnames.Get(userid, &m)
492 if ok {
493 return m[xid]
494 }
495 return ""
496}
497
498var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
499 honkers := gethonkers(userid)
500 m := make(map[string]string)
501 for _, h := range honkers {
502 m[h.Name] = h.XID
503 }
504 return m, true
505}, Invalidator: &honkerinvalidator})
506
507func fullname(name string, userid int64) string {
508 var m map[string]string
509 ok := fullnames.Get(userid, &m)
510 if ok {
511 return m[name]
512 }
513 return ""
514}
515
516func attoreplacer(m string) string {
517 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
518 where := gofish(m)
519 if where == "" {
520 return m
521 }
522 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
523 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
524}
525
526func ontoreplacer(h string) string {
527 return fmt.Sprintf(`<a href="https://%s/o/%s">%s</a>`, serverName,
528 strings.ToLower(h[1:]), h)
529}
530
531var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
532var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
533
534func originate(u string) string {
535 m := re_urlhost.FindStringSubmatch(u)
536 if len(m) > 1 {
537 return m[1]
538 }
539 return ""
540}
541
542var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
543 handle := getxonker(xid, "handle")
544 if handle == "" {
545 dlog.Printf("need to get a handle: %s", xid)
546 info, err := investigate(xid)
547 if err != nil {
548 m := re_unurl.FindStringSubmatch(xid)
549 if len(m) > 2 {
550 handle = m[2]
551 } else {
552 handle = xid
553 }
554 } else {
555 handle = info.Name
556 }
557 }
558 return handle, true
559}})
560
561// handle, handle@host
562func handles(xid string) (string, string) {
563 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
564 return "", ""
565 }
566 var handle string
567 allhandles.Get(xid, &handle)
568 if handle == xid {
569 return xid, xid
570 }
571 return handle, handle + "@" + originate(xid)
572}
573
574func butnottooloud(aud []string) {
575 for i, a := range aud {
576 if strings.HasSuffix(a, "/followers") {
577 aud[i] = ""
578 }
579 }
580}
581
582func loudandproud(aud []string) bool {
583 for _, a := range aud {
584 if a == thewholeworld {
585 return true
586 }
587 }
588 return false
589}
590
591func firstclass(honk *Honk) bool {
592 return honk.Audience[0] == thewholeworld
593}
594
595func oneofakind(a []string) []string {
596 seen := make(map[string]bool)
597 seen[""] = true
598 j := 0
599 for _, s := range a {
600 if !seen[s] {
601 seen[s] = true
602 a[j] = s
603 j++
604 }
605 }
606 return a[:j]
607}
608
609var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
610 var user *WhatAbout
611 ok := somenumberedusers.Get(userid, &user)
612 if !ok {
613 return nil, false
614 }
615 ki := new(KeyInfo)
616 ki.keyname = user.URL + "#key"
617 ki.seckey = user.SecKey
618 return ki, true
619}})
620
621func ziggy(userid int64) *KeyInfo {
622 var ki *KeyInfo
623 ziggies.Get(userid, &ki)
624 return ki
625}
626
627var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
628 data := getxonker(keyname, "pubkey")
629 if data == "" {
630 var key httpsig.PublicKey
631 dlog.Printf("hitting the webs for missing pubkey: %s", keyname)
632 j, err := GetJunk(keyname)
633 if err != nil {
634 ilog.Printf("error getting %s pubkey: %s", keyname, err)
635 when := time.Now().UTC().Format(dbtimeformat)
636 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
637 return key, true
638 }
639 allinjest(originate(keyname), j)
640 data = getxonker(keyname, "pubkey")
641 if data == "" {
642 ilog.Printf("key not found after ingesting")
643 when := time.Now().UTC().Format(dbtimeformat)
644 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
645 return key, true
646 }
647 }
648 _, key, err := httpsig.DecodeKey(data)
649 if err != nil {
650 ilog.Printf("error decoding %s pubkey: %s", keyname, err)
651 return key, true
652 }
653 return key, true
654}, Limit: 512})
655
656func zaggy(keyname string) (httpsig.PublicKey, error) {
657 var key httpsig.PublicKey
658 zaggies.Get(keyname, &key)
659 return key, nil
660}
661
662func savingthrow(keyname string) {
663 when := time.Now().UTC().Add(-30 * time.Minute).Format(dbtimeformat)
664 stmtDeleteXonker.Exec(keyname, "pubkey", when)
665 zaggies.Clear(keyname)
666}
667
668func keymatch(keyname string, actor string) string {
669 hash := strings.IndexByte(keyname, '#')
670 if hash == -1 {
671 hash = len(keyname)
672 }
673 owner := keyname[0:hash]
674 if owner == actor {
675 return originate(actor)
676 }
677 return ""
678}