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