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