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 where := gofish(m)
302 if where != "" {
303 mentions = append(mentions, Mention{Who: m, Where: where})
304 }
305 }
306 return mentions
307}
308
309func bunchofgrapes(s string) []Mention {
310 m := re_mentions.FindAllString(s, -1)
311 var mentions []Mention
312 for i := range m {
313 where := gofish(m[i])
314 if where != "" {
315 mentions = append(mentions, Mention{Who: m[i], Where: where})
316 }
317 }
318 m = re_urltions.FindAllString(s, -1)
319 for i := range m {
320 mentions = append(mentions, Mention{Who: m[i][1:], Where: m[i][1:]})
321 }
322 return mentions
323}
324
325type Emu struct {
326 ID string
327 Name string
328}
329
330var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
331
332var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
333 fname := ename[1 : len(ename)-1]
334 _, err := os.Stat(dataDir + "/emus/" + fname + ".png")
335 if err != nil {
336 return Emu{Name: ename, ID: ""}, true
337 }
338 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
339 return Emu{ID: url, Name: ename}, true
340}, Duration: 10 * time.Second})
341
342func herdofemus(noise string) []Emu {
343 m := re_emus.FindAllString(noise, -1)
344 m = oneofakind(m)
345 var emus []Emu
346 for _, e := range m {
347 var emu Emu
348 emucache.Get(e, &emu)
349 if emu.ID == "" {
350 continue
351 }
352 emus = append(emus, emu)
353 }
354 return emus
355}
356
357var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
358var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
359
360func memetize(honk *Honk) {
361 repl := func(x string) string {
362 name := x[5:]
363 if name[0] == ' ' {
364 name = name[1:]
365 }
366 fd, err := os.Open("memes/" + name)
367 if err != nil {
368 log.Printf("no meme for %s", name)
369 return x
370 }
371 var peek [512]byte
372 n, _ := fd.Read(peek[:])
373 ct := http.DetectContentType(peek[:n])
374 fd.Close()
375
376 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
377 fileid, err := savefile("", name, name, url, ct, false, nil)
378 if err != nil {
379 log.Printf("error saving meme: %s", err)
380 return x
381 }
382 d := &Donk{
383 FileID: fileid,
384 XID: "",
385 Name: name,
386 Media: ct,
387 URL: url,
388 Local: false,
389 }
390 honk.Donks = append(honk.Donks, d)
391 return ""
392 }
393 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
394}
395
396var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n.]|$)")
397
398func quickrename(s string, userid int64) string {
399 nonstop := true
400 for nonstop {
401 nonstop = false
402 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
403 prefix := ""
404 if m[0] == ' ' || m[0] == '\n' {
405 prefix = m[:1]
406 m = m[1:]
407 }
408 prefix += "@"
409 m = m[1:]
410 tail := ""
411 if last := m[len(m)-1]; last == ' ' || last == '\n' || last == '.' {
412 tail = m[len(m)-1:]
413 m = m[:len(m)-1]
414 }
415
416 xid := fullname(m, userid)
417
418 if xid != "" {
419 _, name := handles(xid)
420 if name != "" {
421 nonstop = true
422 m = name
423 }
424 }
425 return prefix + m + tail
426 })
427 }
428 return s
429}
430
431var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
432 honkers := gethonkers(userid)
433 m := make(map[string]string)
434 for _, h := range honkers {
435 m[h.XID] = h.Name
436 }
437 return m, true
438}, Invalidator: &honkerinvalidator})
439
440func shortname(userid int64, xid string) string {
441 var m map[string]string
442 ok := shortnames.Get(userid, &m)
443 if ok {
444 return m[xid]
445 }
446 return ""
447}
448
449var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
450 honkers := gethonkers(userid)
451 m := make(map[string]string)
452 for _, h := range honkers {
453 m[h.Name] = h.XID
454 }
455 return m, true
456}, Invalidator: &honkerinvalidator})
457
458func fullname(name string, userid int64) string {
459 var m map[string]string
460 ok := fullnames.Get(userid, &m)
461 if ok {
462 return m[name]
463 }
464 return ""
465}
466
467func mentionize(s string) string {
468 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
469 where := gofish(m)
470 if where == "" {
471 return m
472 }
473 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
474 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
475 html.EscapeString(where), html.EscapeString(who))
476 })
477 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
478 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
479 html.EscapeString(m[1:]), html.EscapeString(m))
480 })
481 return s
482}
483
484func ontologize(s string) string {
485 s = re_hashes.ReplaceAllStringFunc(s, func(o string) string {
486 if o[0] == '&' {
487 return o
488 }
489 p := ""
490 h := o
491 if h[0] != '#' {
492 p = h[:1]
493 h = h[1:]
494 }
495 return fmt.Sprintf(`%s<a href="https://%s/o/%s">%s</a>`, p, serverName,
496 strings.ToLower(h[1:]), h)
497 })
498 return s
499}
500
501var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
502var re_urlhost = regexp.MustCompile("https://([^/ ]+)")
503
504func originate(u string) string {
505 m := re_urlhost.FindStringSubmatch(u)
506 if len(m) > 1 {
507 return m[1]
508 }
509 return ""
510}
511
512var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
513 var handle string
514 row := stmtGetXonker.QueryRow(xid, "handle")
515 err := row.Scan(&handle)
516 if err != nil {
517 log.Printf("need to get a handle: %s", xid)
518 info, err := investigate(xid)
519 if err != nil {
520 m := re_unurl.FindStringSubmatch(xid)
521 if len(m) > 2 {
522 handle = m[2]
523 } else {
524 handle = xid
525 }
526 } else {
527 handle = info.Name
528 }
529 }
530 return handle, true
531}})
532
533// handle, handle@host
534func handles(xid string) (string, string) {
535 if xid == "" {
536 return "", ""
537 }
538 var handle string
539 allhandles.Get(xid, &handle)
540 if handle == xid {
541 return xid, xid
542 }
543 return handle, handle + "@" + originate(xid)
544}
545
546func butnottooloud(aud []string) {
547 for i, a := range aud {
548 if strings.HasSuffix(a, "/followers") {
549 aud[i] = ""
550 }
551 }
552}
553
554func loudandproud(aud []string) bool {
555 for _, a := range aud {
556 if a == thewholeworld {
557 return true
558 }
559 }
560 return false
561}
562
563func firstclass(honk *Honk) bool {
564 return honk.Audience[0] == thewholeworld
565}
566
567func oneofakind(a []string) []string {
568 seen := make(map[string]bool)
569 seen[""] = true
570 j := 0
571 for _, s := range a {
572 if !seen[s] {
573 seen[s] = true
574 a[j] = s
575 j++
576 }
577 }
578 return a[:j]
579}
580
581var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
582 var user *WhatAbout
583 ok := somenumberedusers.Get(userid, &user)
584 if !ok {
585 return nil, false
586 }
587 ki := new(KeyInfo)
588 ki.keyname = user.URL + "#key"
589 ki.seckey = user.SecKey
590 return ki, true
591}})
592
593func ziggy(userid int64) *KeyInfo {
594 var ki *KeyInfo
595 ziggies.Get(userid, &ki)
596 return ki
597}
598
599var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
600 var data string
601 row := stmtGetXonker.QueryRow(keyname, "pubkey")
602 err := row.Scan(&data)
603 var key httpsig.PublicKey
604 if err != nil {
605 log.Printf("hitting the webs for missing pubkey: %s", keyname)
606 j, err := GetJunk(keyname)
607 if err != nil {
608 log.Printf("error getting %s pubkey: %s", keyname, err)
609 when := time.Now().UTC().Format(dbtimeformat)
610 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
611 return key, true
612 }
613 allinjest(originate(keyname), j)
614 row = stmtGetXonker.QueryRow(keyname, "pubkey")
615 err = row.Scan(&data)
616 if err != nil {
617 log.Printf("key not found after ingesting")
618 when := time.Now().UTC().Format(dbtimeformat)
619 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
620 return key, true
621 }
622 }
623 _, key, err = httpsig.DecodeKey(data)
624 if err != nil {
625 log.Printf("error decoding %s pubkey: %s", keyname, err)
626 return key, true
627 }
628 return key, true
629}, Limit: 512})
630
631func zaggy(keyname string) httpsig.PublicKey {
632 var key httpsig.PublicKey
633 zaggies.Get(keyname, &key)
634 return key
635}
636
637func savingthrow(keyname string) {
638 when := time.Now().UTC().Add(-30 * time.Minute).Format(dbtimeformat)
639 stmtDeleteXonker.Exec(keyname, "pubkey", when)
640 zaggies.Clear(keyname)
641}
642
643func keymatch(keyname string, actor string) string {
644 hash := strings.IndexByte(keyname, '#')
645 if hash == -1 {
646 hash = len(keyname)
647 }
648 owner := keyname[0:hash]
649 if owner == actor {
650 return originate(actor)
651 }
652 return ""
653}