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