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