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