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 "log"
25 "net/http"
26 "net/url"
27 "os"
28 "regexp"
29 "strings"
30 "time"
31
32 "golang.org/x/net/html"
33 "humungus.tedunangst.com/r/webs/cache"
34 "humungus.tedunangst.com/r/webs/htfilter"
35 "humungus.tedunangst.com/r/webs/httpsig"
36 "humungus.tedunangst.com/r/webs/mz"
37 "humungus.tedunangst.com/r/webs/templates"
38)
39
40var allowedclasses = make(map[string]bool)
41
42func init() {
43 allowedclasses["kw"] = true
44 allowedclasses["bi"] = true
45 allowedclasses["st"] = true
46 allowedclasses["nm"] = true
47 allowedclasses["tp"] = true
48 allowedclasses["op"] = true
49 allowedclasses["cm"] = true
50 allowedclasses["al"] = true
51 allowedclasses["dl"] = true
52}
53
54func reverbolate(userid int64, honks []*Honk) {
55 var user *WhatAbout
56 somenumberedusers.Get(userid, &user)
57 for _, h := range honks {
58 h.What += "ed"
59 if h.What == "tonked" {
60 h.What = "honked back"
61 h.Style += " subtle"
62 }
63 if !h.Public {
64 h.Style += " limited"
65 }
66 translate(h)
67 local := false
68 if h.Whofore == 2 || h.Whofore == 3 {
69 local = true
70 }
71 if local && h.What != "bonked" {
72 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
73 }
74 h.Username, h.Handle = handles(h.Honker)
75 if !local {
76 short := shortname(userid, h.Honker)
77 if short != "" {
78 h.Username = short
79 } else {
80 h.Username = h.Handle
81 if len(h.Username) > 20 {
82 h.Username = h.Username[:20] + ".."
83 }
84 }
85 }
86 if user != nil {
87 if user.Options.MentionAll {
88 hset := []string{"@" + h.Handle}
89 for _, a := range h.Audience {
90 if a == h.Honker || a == user.URL {
91 continue
92 }
93 _, hand := handles(a)
94 if hand != "" {
95 hand = "@" + hand
96 hset = append(hset, hand)
97 }
98 }
99 h.Handles = strings.Join(hset, " ")
100 } else if h.Honker != user.URL {
101 h.Handles = "@" + h.Handle
102 }
103 }
104 if h.URL == "" {
105 h.URL = h.XID
106 }
107 if h.Oonker != "" {
108 _, h.Oondle = handles(h.Oonker)
109 }
110 h.Precis = demoji(h.Precis)
111 h.Noise = demoji(h.Noise)
112 h.Open = "open"
113
114 zap := make(map[string]bool)
115 {
116 var htf htfilter.Filter
117 htf.Imager = replaceimgsand(zap, false)
118 htf.SpanClasses = allowedclasses
119 htf.BaseURL, _ = url.Parse(h.XID)
120 emuxifier := func(e string) string {
121 for _, d := range h.Donks {
122 if d.Name == e {
123 zap[d.XID] = true
124 if d.Local {
125 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
126 }
127 }
128 }
129 if local && h.What != "bonked" {
130 var emu Emu
131 emucache.Get(e, &emu)
132 if emu.ID != "" {
133 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
134 }
135 }
136 return e
137 }
138 htf.FilterText = func(w io.Writer, data string) {
139 data = htfilter.EscapeText(data)
140 data = re_emus.ReplaceAllStringFunc(data, emuxifier)
141 io.WriteString(w, data)
142 }
143 p, _ := htf.String(h.Precis)
144 n, _ := htf.String(h.Noise)
145 h.Precis = string(p)
146 h.Noise = string(n)
147 }
148 j := 0
149 for i := 0; i < len(h.Donks); i++ {
150 if !zap[h.Donks[i].XID] {
151 h.Donks[j] = h.Donks[i]
152 j++
153 }
154 }
155 h.Donks = h.Donks[:j]
156 }
157
158 unsee(honks, userid)
159
160 for _, h := range honks {
161 renderflags(h)
162
163 h.HTPrecis = template.HTML(h.Precis)
164 h.HTML = template.HTML(h.Noise)
165 }
166}
167
168func replaceimgsand(zap map[string]bool, absolute bool) func(node *html.Node) string {
169 return func(node *html.Node) string {
170 src := htfilter.GetAttr(node, "src")
171 alt := htfilter.GetAttr(node, "alt")
172 //title := GetAttr(node, "title")
173 if htfilter.HasClass(node, "Emoji") && alt != "" {
174 return alt
175 }
176 d := finddonk(src)
177 if d != nil {
178 zap[d.XID] = true
179 base := ""
180 if absolute {
181 base = "https://" + serverName
182 }
183 return string(templates.Sprintf(`<img alt="%s" title="%s" src="%s/d/%s">`, alt, alt, base, d.XID))
184 }
185 return string(templates.Sprintf(`<img alt="%s" src="<a href="%s">%s</a>">`, alt, src, src))
186 }
187}
188
189func translatechonk(ch *Chonk) {
190 noise := ch.Noise
191 if ch.Format == "markdown" {
192 noise = markitzero(noise)
193 }
194 var htf htfilter.Filter
195 htf.SpanClasses = allowedclasses
196 htf.BaseURL, _ = url.Parse(ch.XID)
197 ch.HTML, _ = htf.String(noise)
198}
199
200func filterchonk(ch *Chonk) {
201 translatechonk(ch)
202
203 noise := string(ch.HTML)
204
205 local := originate(ch.XID) == serverName
206
207 zap := make(map[string]bool)
208 emuxifier := func(e string) string {
209 for _, d := range ch.Donks {
210 if d.Name == e {
211 zap[d.XID] = true
212 if d.Local {
213 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
214 }
215 }
216 }
217 if local {
218 var emu Emu
219 emucache.Get(e, &emu)
220 if emu.ID != "" {
221 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
222 }
223 }
224 return e
225 }
226 noise = re_emus.ReplaceAllStringFunc(noise, emuxifier)
227 j := 0
228 for i := 0; i < len(ch.Donks); i++ {
229 if !zap[ch.Donks[i].XID] {
230 ch.Donks[j] = ch.Donks[i]
231 j++
232 }
233 }
234 ch.Donks = ch.Donks[:j]
235
236 if strings.HasPrefix(noise, "<p>") {
237 noise = noise[3:]
238 }
239 ch.HTML = template.HTML(noise)
240 if short := shortname(ch.UserID, ch.Who); short != "" {
241 ch.Handle = short
242 } else {
243 ch.Handle, _ = handles(ch.Who)
244 }
245
246}
247
248func inlineimgsfor(honk *Honk) func(node *html.Node) string {
249 return func(node *html.Node) string {
250 src := htfilter.GetAttr(node, "src")
251 alt := htfilter.GetAttr(node, "alt")
252 d := savedonk(src, "image", alt, "image", true)
253 if d != nil {
254 honk.Donks = append(honk.Donks, d)
255 }
256 log.Printf("inline img with src: %s", src)
257 return ""
258 }
259}
260
261func imaginate(honk *Honk) {
262 var htf htfilter.Filter
263 htf.Imager = inlineimgsfor(honk)
264 htf.BaseURL, _ = url.Parse(honk.XID)
265 htf.String(honk.Noise)
266}
267
268func translate(honk *Honk) {
269 if honk.Format == "html" {
270 return
271 }
272 noise := honk.Noise
273 if strings.HasPrefix(noise, "DZ:") {
274 idx := strings.Index(noise, "\n")
275 if idx == -1 {
276 honk.Precis = noise
277 noise = ""
278 } else {
279 honk.Precis = noise[:idx]
280 noise = noise[idx+1:]
281 }
282 }
283 honk.Precis = markitzero(strings.TrimSpace(honk.Precis))
284
285 var marker mz.Marker
286 marker.HashLinker = ontoreplacer
287 marker.AtLinker = attoreplacer
288 noise = strings.TrimSpace(noise)
289 noise = marker.Mark(noise)
290 honk.Noise = noise
291 honk.Onts = oneofakind(marker.HashTags)
292 honk.Mentions = bunchofgrapes(marker.Mentions)
293}
294
295func redoimages(honk *Honk) {
296 zap := make(map[string]bool)
297 {
298 var htf htfilter.Filter
299 htf.Imager = replaceimgsand(zap, true)
300 htf.SpanClasses = allowedclasses
301 p, _ := htf.String(honk.Precis)
302 n, _ := htf.String(honk.Noise)
303 honk.Precis = string(p)
304 honk.Noise = string(n)
305 }
306 j := 0
307 for i := 0; i < len(honk.Donks); i++ {
308 if !zap[honk.Donks[i].XID] {
309 honk.Donks[j] = honk.Donks[i]
310 j++
311 }
312 }
313 honk.Donks = honk.Donks[:j]
314
315 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
316 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
317}
318
319func xcelerate(b []byte) string {
320 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
321 for i, c := range b {
322 b[i] = letters[c&63]
323 }
324 s := string(b)
325 return s
326}
327
328func shortxid(xid string) string {
329 h := sha512.New512_256()
330 io.WriteString(h, xid)
331 return xcelerate(h.Sum(nil)[:20])
332}
333
334func xfiltrate() string {
335 var b [18]byte
336 rand.Read(b[:])
337 return xcelerate(b[:])
338}
339
340func grapevine(mentions []Mention) []string {
341 var s []string
342 for _, m := range mentions {
343 s = append(s, m.Where)
344 }
345 return s
346}
347
348func bunchofgrapes(m []string) []Mention {
349 var mentions []Mention
350 for i := range m {
351 where := gofish(m[i])
352 if where != "" {
353 mentions = append(mentions, Mention{Who: m[i], Where: where})
354 }
355 }
356 return mentions
357}
358
359type Emu struct {
360 ID string
361 Name string
362}
363
364var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
365
366var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
367 fname := ename[1 : len(ename)-1]
368 _, err := os.Stat(dataDir + "/emus/" + fname + ".png")
369 if err != nil {
370 return Emu{Name: ename, ID: ""}, true
371 }
372 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
373 return Emu{ID: url, Name: ename}, true
374}, Duration: 10 * time.Second})
375
376func herdofemus(noise string) []Emu {
377 m := re_emus.FindAllString(noise, -1)
378 m = oneofakind(m)
379 var emus []Emu
380 for _, e := range m {
381 var emu Emu
382 emucache.Get(e, &emu)
383 if emu.ID == "" {
384 continue
385 }
386 emus = append(emus, emu)
387 }
388 return emus
389}
390
391var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
392var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
393
394func memetize(honk *Honk) {
395 repl := func(x string) string {
396 name := x[5:]
397 if name[0] == ' ' {
398 name = name[1:]
399 }
400 fd, err := os.Open("memes/" + name)
401 if err != nil {
402 log.Printf("no meme for %s", name)
403 return x
404 }
405 var peek [512]byte
406 n, _ := fd.Read(peek[:])
407 ct := http.DetectContentType(peek[:n])
408 fd.Close()
409
410 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
411 fileid, err := savefile("", name, name, url, ct, false, nil)
412 if err != nil {
413 log.Printf("error saving meme: %s", err)
414 return x
415 }
416 d := &Donk{
417 FileID: fileid,
418 XID: "",
419 Name: name,
420 Media: ct,
421 URL: url,
422 Local: false,
423 }
424 honk.Donks = append(honk.Donks, d)
425 return ""
426 }
427 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
428}
429
430var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n.]|$)")
431
432func quickrename(s string, userid int64) string {
433 nonstop := true
434 for nonstop {
435 nonstop = false
436 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
437 prefix := ""
438 if m[0] == ' ' || m[0] == '\n' {
439 prefix = m[:1]
440 m = m[1:]
441 }
442 prefix += "@"
443 m = m[1:]
444 tail := ""
445 if last := m[len(m)-1]; last == ' ' || last == '\n' || last == '.' {
446 tail = m[len(m)-1:]
447 m = m[:len(m)-1]
448 }
449
450 xid := fullname(m, userid)
451
452 if xid != "" {
453 _, name := handles(xid)
454 if name != "" {
455 nonstop = true
456 m = name
457 }
458 }
459 return prefix + m + tail
460 })
461 }
462 return s
463}
464
465var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
466 honkers := gethonkers(userid)
467 m := make(map[string]string)
468 for _, h := range honkers {
469 m[h.XID] = h.Name
470 }
471 return m, true
472}, Invalidator: &honkerinvalidator})
473
474func shortname(userid int64, xid string) string {
475 var m map[string]string
476 ok := shortnames.Get(userid, &m)
477 if ok {
478 return m[xid]
479 }
480 return ""
481}
482
483var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
484 honkers := gethonkers(userid)
485 m := make(map[string]string)
486 for _, h := range honkers {
487 m[h.Name] = h.XID
488 }
489 return m, true
490}, Invalidator: &honkerinvalidator})
491
492func fullname(name string, userid int64) string {
493 var m map[string]string
494 ok := fullnames.Get(userid, &m)
495 if ok {
496 return m[name]
497 }
498 return ""
499}
500
501func attoreplacer(m string) string {
502 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
503 where := gofish(m)
504 if where == "" {
505 return m
506 }
507 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
508 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
509}
510
511func ontoreplacer(h string) string {
512 return fmt.Sprintf(`<a href="https://%s/o/%s">%s</a>`, serverName,
513 strings.ToLower(h[1:]), h)
514}
515
516var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
517var re_urlhost = regexp.MustCompile("https://([^/ #)]+)")
518
519func originate(u string) string {
520 m := re_urlhost.FindStringSubmatch(u)
521 if len(m) > 1 {
522 return m[1]
523 }
524 return ""
525}
526
527var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
528 var handle string
529 row := stmtGetXonker.QueryRow(xid, "handle")
530 err := row.Scan(&handle)
531 if err != nil {
532 log.Printf("need to get a handle: %s", xid)
533 info, err := investigate(xid)
534 if err != nil {
535 m := re_unurl.FindStringSubmatch(xid)
536 if len(m) > 2 {
537 handle = m[2]
538 } else {
539 handle = xid
540 }
541 } else {
542 handle = info.Name
543 }
544 }
545 return handle, true
546}})
547
548// handle, handle@host
549func handles(xid string) (string, string) {
550 if xid == "" || xid == thewholeworld || strings.HasSuffix(xid, "/followers") {
551 return "", ""
552 }
553 var handle string
554 allhandles.Get(xid, &handle)
555 if handle == xid {
556 return xid, xid
557 }
558 return handle, handle + "@" + originate(xid)
559}
560
561func butnottooloud(aud []string) {
562 for i, a := range aud {
563 if strings.HasSuffix(a, "/followers") {
564 aud[i] = ""
565 }
566 }
567}
568
569func loudandproud(aud []string) bool {
570 for _, a := range aud {
571 if a == thewholeworld {
572 return true
573 }
574 }
575 return false
576}
577
578func firstclass(honk *Honk) bool {
579 return honk.Audience[0] == thewholeworld
580}
581
582func oneofakind(a []string) []string {
583 seen := make(map[string]bool)
584 seen[""] = true
585 j := 0
586 for _, s := range a {
587 if !seen[s] {
588 seen[s] = true
589 a[j] = s
590 j++
591 }
592 }
593 return a[:j]
594}
595
596var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
597 var user *WhatAbout
598 ok := somenumberedusers.Get(userid, &user)
599 if !ok {
600 return nil, false
601 }
602 ki := new(KeyInfo)
603 ki.keyname = user.URL + "#key"
604 ki.seckey = user.SecKey
605 return ki, true
606}})
607
608func ziggy(userid int64) *KeyInfo {
609 var ki *KeyInfo
610 ziggies.Get(userid, &ki)
611 return ki
612}
613
614var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
615 var data string
616 row := stmtGetXonker.QueryRow(keyname, "pubkey")
617 err := row.Scan(&data)
618 var key httpsig.PublicKey
619 if err != nil {
620 log.Printf("hitting the webs for missing pubkey: %s", keyname)
621 j, err := GetJunk(keyname)
622 if err != nil {
623 log.Printf("error getting %s pubkey: %s", keyname, err)
624 when := time.Now().UTC().Format(dbtimeformat)
625 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
626 return key, true
627 }
628 allinjest(originate(keyname), j)
629 row = stmtGetXonker.QueryRow(keyname, "pubkey")
630 err = row.Scan(&data)
631 if err != nil {
632 log.Printf("key not found after ingesting")
633 when := time.Now().UTC().Format(dbtimeformat)
634 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
635 return key, true
636 }
637 }
638 _, key, err = httpsig.DecodeKey(data)
639 if err != nil {
640 log.Printf("error decoding %s pubkey: %s", keyname, err)
641 return key, true
642 }
643 return key, true
644}, Limit: 512})
645
646func zaggy(keyname string) httpsig.PublicKey {
647 var key httpsig.PublicKey
648 zaggies.Get(keyname, &key)
649 return key
650}
651
652func savingthrow(keyname string) {
653 when := time.Now().UTC().Add(-30 * time.Minute).Format(dbtimeformat)
654 stmtDeleteXonker.Exec(keyname, "pubkey", when)
655 zaggies.Clear(keyname)
656}
657
658func keymatch(keyname string, actor string) string {
659 hash := strings.IndexByte(keyname, '#')
660 if hash == -1 {
661 hash = len(keyname)
662 }
663 owner := keyname[0:hash]
664 if owner == actor {
665 return originate(actor)
666 }
667 return ""
668}