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(s string) []string {
291 var mentions []string
292 m := re_mentions.FindAllString(s, -1)
293 for i := range m {
294 where := gofish(m[i])
295 if where != "" {
296 mentions = append(mentions, where)
297 }
298 }
299 m = re_urltions.FindAllString(s, -1)
300 for i := range m {
301 mentions = append(mentions, m[i][1:])
302 }
303 return mentions
304}
305
306func bunchofgrapes(s string) []Mention {
307 m := re_mentions.FindAllString(s, -1)
308 var mentions []Mention
309 for i := range m {
310 where := gofish(m[i])
311 if where != "" {
312 mentions = append(mentions, Mention{Who: m[i], Where: where})
313 }
314 }
315 m = re_urltions.FindAllString(s, -1)
316 for i := range m {
317 mentions = append(mentions, Mention{Who: m[i][1:], Where: m[i][1:]})
318 }
319 return mentions
320}
321
322type Emu struct {
323 ID string
324 Name string
325}
326
327var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
328
329var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
330 fname := ename[1 : len(ename)-1]
331 _, err := os.Stat(dataDir + "/emus/" + fname + ".png")
332 if err != nil {
333 return Emu{Name: ename, ID: ""}, true
334 }
335 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
336 return Emu{ID: url, Name: ename}, true
337}, Duration: 10 * time.Second})
338
339func herdofemus(noise string) []Emu {
340 m := re_emus.FindAllString(noise, -1)
341 m = oneofakind(m)
342 var emus []Emu
343 for _, e := range m {
344 var emu Emu
345 emucache.Get(e, &emu)
346 if emu.ID == "" {
347 continue
348 }
349 emus = append(emus, emu)
350 }
351 return emus
352}
353
354var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
355var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
356
357func memetize(honk *Honk) {
358 repl := func(x string) string {
359 name := x[5:]
360 if name[0] == ' ' {
361 name = name[1:]
362 }
363 fd, err := os.Open("memes/" + name)
364 if err != nil {
365 log.Printf("no meme for %s", name)
366 return x
367 }
368 var peek [512]byte
369 n, _ := fd.Read(peek[:])
370 ct := http.DetectContentType(peek[:n])
371 fd.Close()
372
373 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
374 fileid, err := savefile("", name, name, url, ct, false, nil)
375 if err != nil {
376 log.Printf("error saving meme: %s", err)
377 return x
378 }
379 d := &Donk{
380 FileID: fileid,
381 XID: "",
382 Name: name,
383 Media: ct,
384 URL: url,
385 Local: false,
386 }
387 honk.Donks = append(honk.Donks, d)
388 return ""
389 }
390 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
391}
392
393var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n.]|$)")
394
395func quickrename(s string, userid int64) string {
396 nonstop := true
397 for nonstop {
398 nonstop = false
399 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
400 prefix := ""
401 if m[0] == ' ' || m[0] == '\n' {
402 prefix = m[:1]
403 m = m[1:]
404 }
405 prefix += "@"
406 m = m[1:]
407 tail := ""
408 if last := m[len(m)-1]; last == ' ' || last == '\n' || last == '.' {
409 tail = m[len(m)-1:]
410 m = m[:len(m)-1]
411 }
412
413 xid := fullname(m, userid)
414
415 if xid != "" {
416 _, name := handles(xid)
417 if name != "" {
418 nonstop = true
419 m = name
420 }
421 }
422 return prefix + m + tail
423 })
424 }
425 return s
426}
427
428var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
429 honkers := gethonkers(userid)
430 m := make(map[string]string)
431 for _, h := range honkers {
432 m[h.XID] = h.Name
433 }
434 return m, true
435}, Invalidator: &honkerinvalidator})
436
437func shortname(userid int64, xid string) string {
438 var m map[string]string
439 ok := shortnames.Get(userid, &m)
440 if ok {
441 return m[xid]
442 }
443 return ""
444}
445
446var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
447 honkers := gethonkers(userid)
448 m := make(map[string]string)
449 for _, h := range honkers {
450 m[h.Name] = h.XID
451 }
452 return m, true
453}, Invalidator: &honkerinvalidator})
454
455func fullname(name string, userid int64) string {
456 var m map[string]string
457 ok := fullnames.Get(userid, &m)
458 if ok {
459 return m[name]
460 }
461 return ""
462}
463
464func mentionize(s string) string {
465 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
466 where := gofish(m)
467 if where == "" {
468 return m
469 }
470 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
471 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
472 html.EscapeString(where), html.EscapeString(who))
473 })
474 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
475 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
476 html.EscapeString(m[1:]), html.EscapeString(m))
477 })
478 return s
479}
480
481func ontologize(s string) string {
482 s = re_hashes.ReplaceAllStringFunc(s, func(o string) string {
483 if o[0] == '&' {
484 return o
485 }
486 p := ""
487 h := o
488 if h[0] != '#' {
489 p = h[:1]
490 h = h[1:]
491 }
492 return fmt.Sprintf(`%s<a href="https://%s/o/%s">%s</a>`, p, serverName,
493 strings.ToLower(h[1:]), h)
494 })
495 return s
496}
497
498var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
499var re_urlhost = regexp.MustCompile("https://([^/ ]+)")
500
501func originate(u string) string {
502 m := re_urlhost.FindStringSubmatch(u)
503 if len(m) > 1 {
504 return m[1]
505 }
506 return ""
507}
508
509var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
510 var handle string
511 row := stmtGetXonker.QueryRow(xid, "handle")
512 err := row.Scan(&handle)
513 if err != nil {
514 log.Printf("need to get a handle: %s", xid)
515 info, err := investigate(xid)
516 if err != nil {
517 m := re_unurl.FindStringSubmatch(xid)
518 if len(m) > 2 {
519 handle = m[2]
520 } else {
521 handle = xid
522 }
523 } else {
524 handle = info.Name
525 }
526 }
527 return handle, true
528}})
529
530// handle, handle@host
531func handles(xid string) (string, string) {
532 if xid == "" {
533 return "", ""
534 }
535 var handle string
536 allhandles.Get(xid, &handle)
537 if handle == xid {
538 return xid, xid
539 }
540 return handle, handle + "@" + originate(xid)
541}
542
543func butnottooloud(aud []string) {
544 for i, a := range aud {
545 if strings.HasSuffix(a, "/followers") {
546 aud[i] = ""
547 }
548 }
549}
550
551func loudandproud(aud []string) bool {
552 for _, a := range aud {
553 if a == thewholeworld {
554 return true
555 }
556 }
557 return false
558}
559
560func firstclass(honk *Honk) bool {
561 return honk.Audience[0] == thewholeworld
562}
563
564func oneofakind(a []string) []string {
565 seen := make(map[string]bool)
566 seen[""] = true
567 j := 0
568 for _, s := range a {
569 if !seen[s] {
570 seen[s] = true
571 a[j] = s
572 j++
573 }
574 }
575 return a[:j]
576}
577
578var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
579 var user *WhatAbout
580 ok := somenumberedusers.Get(userid, &user)
581 if !ok {
582 return nil, false
583 }
584 ki := new(KeyInfo)
585 ki.keyname = user.URL + "#key"
586 ki.seckey = user.SecKey
587 return ki, true
588}})
589
590func ziggy(userid int64) *KeyInfo {
591 var ki *KeyInfo
592 ziggies.Get(userid, &ki)
593 return ki
594}
595
596var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
597 var data string
598 row := stmtGetXonker.QueryRow(keyname, "pubkey")
599 err := row.Scan(&data)
600 var key httpsig.PublicKey
601 if err != nil {
602 log.Printf("hitting the webs for missing pubkey: %s", keyname)
603 j, err := GetJunk(keyname)
604 if err != nil {
605 log.Printf("error getting %s pubkey: %s", keyname, err)
606 when := time.Now().UTC().Format(dbtimeformat)
607 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
608 return key, true
609 }
610 allinjest(originate(keyname), j)
611 row = stmtGetXonker.QueryRow(keyname, "pubkey")
612 err = row.Scan(&data)
613 if err != nil {
614 log.Printf("key not found after ingesting")
615 when := time.Now().UTC().Format(dbtimeformat)
616 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
617 return key, true
618 }
619 }
620 _, key, err = httpsig.DecodeKey(data)
621 if err != nil {
622 log.Printf("error decoding %s pubkey: %s", keyname, err)
623 return key, true
624 }
625 return key, true
626}, Limit: 512})
627
628func zaggy(keyname string) httpsig.PublicKey {
629 var key httpsig.PublicKey
630 zaggies.Get(keyname, &key)
631 return key
632}
633
634func savingthrow(keyname string) {
635 when := time.Now().UTC().Add(-30 * time.Minute).Format(dbtimeformat)
636 stmtDeleteXonker.Exec(keyname, "pubkey", when)
637 zaggies.Clear(keyname)
638}
639
640func keymatch(keyname string, actor string) string {
641 hash := strings.IndexByte(keyname, '#')
642 if hash == -1 {
643 hash = len(keyname)
644 }
645 owner := keyname[0:hash]
646 if owner == actor {
647 return originate(actor)
648 }
649 return ""
650}