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