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(userid int64, s string) []Mention {
299 var mentions []Mention
300 for _, m := range strings.Split(s, " ") {
301 if m == "" {
302 continue
303 }
304 var where string
305 if name := fullname(m, userid); name != "" {
306 where = name
307 } else {
308 where = gofish(m)
309 }
310 if where != "" {
311 mentions = append(mentions, Mention{Who: m, Where: where})
312 }
313 }
314 return mentions
315}
316
317func bunchofgrapes(s string) []Mention {
318 m := re_mentions.FindAllString(s, -1)
319 var mentions []Mention
320 for i := range m {
321 where := gofish(m[i])
322 if where != "" {
323 mentions = append(mentions, Mention{Who: m[i], Where: where})
324 }
325 }
326 m = re_urltions.FindAllString(s, -1)
327 for i := range m {
328 mentions = append(mentions, Mention{Who: m[i][1:], Where: m[i][1:]})
329 }
330 return mentions
331}
332
333type Emu struct {
334 ID string
335 Name string
336}
337
338var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
339
340var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
341 fname := ename[1 : len(ename)-1]
342 _, err := os.Stat(dataDir + "/emus/" + fname + ".png")
343 if err != nil {
344 return Emu{Name: ename, ID: ""}, true
345 }
346 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
347 return Emu{ID: url, Name: ename}, true
348}, Duration: 10 * time.Second})
349
350func herdofemus(noise string) []Emu {
351 m := re_emus.FindAllString(noise, -1)
352 m = oneofakind(m)
353 var emus []Emu
354 for _, e := range m {
355 var emu Emu
356 emucache.Get(e, &emu)
357 if emu.ID == "" {
358 continue
359 }
360 emus = append(emus, emu)
361 }
362 return emus
363}
364
365var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
366var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
367
368func memetize(honk *Honk) {
369 repl := func(x string) string {
370 name := x[5:]
371 if name[0] == ' ' {
372 name = name[1:]
373 }
374 fd, err := os.Open("memes/" + name)
375 if err != nil {
376 log.Printf("no meme for %s", name)
377 return x
378 }
379 var peek [512]byte
380 n, _ := fd.Read(peek[:])
381 ct := http.DetectContentType(peek[:n])
382 fd.Close()
383
384 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
385 fileid, err := savefile("", name, name, url, ct, false, nil)
386 if err != nil {
387 log.Printf("error saving meme: %s", err)
388 return x
389 }
390 d := &Donk{
391 FileID: fileid,
392 XID: "",
393 Name: name,
394 Media: ct,
395 URL: url,
396 Local: false,
397 }
398 honk.Donks = append(honk.Donks, d)
399 return ""
400 }
401 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
402}
403
404var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n.]|$)")
405
406func quickrename(s string, userid int64) string {
407 nonstop := true
408 for nonstop {
409 nonstop = false
410 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
411 prefix := ""
412 if m[0] == ' ' || m[0] == '\n' {
413 prefix = m[:1]
414 m = m[1:]
415 }
416 prefix += "@"
417 m = m[1:]
418 tail := ""
419 if last := m[len(m)-1]; last == ' ' || last == '\n' || last == '.' {
420 tail = m[len(m)-1:]
421 m = m[:len(m)-1]
422 }
423
424 xid := fullname(m, userid)
425
426 if xid != "" {
427 _, name := handles(xid)
428 if name != "" {
429 nonstop = true
430 m = name
431 }
432 }
433 return prefix + m + tail
434 })
435 }
436 return s
437}
438
439var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
440 honkers := gethonkers(userid)
441 m := make(map[string]string)
442 for _, h := range honkers {
443 m[h.XID] = h.Name
444 }
445 return m, true
446}, Invalidator: &honkerinvalidator})
447
448func shortname(userid int64, xid string) string {
449 var m map[string]string
450 ok := shortnames.Get(userid, &m)
451 if ok {
452 return m[xid]
453 }
454 return ""
455}
456
457var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
458 honkers := gethonkers(userid)
459 m := make(map[string]string)
460 for _, h := range honkers {
461 m[h.Name] = h.XID
462 }
463 return m, true
464}, Invalidator: &honkerinvalidator})
465
466func fullname(name string, userid int64) string {
467 var m map[string]string
468 ok := fullnames.Get(userid, &m)
469 if ok {
470 return m[name]
471 }
472 return ""
473}
474
475func mentionize(s string) string {
476 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
477 where := gofish(m)
478 if where == "" {
479 return m
480 }
481 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
482 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
483 html.EscapeString(where), html.EscapeString(who))
484 })
485 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
486 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
487 html.EscapeString(m[1:]), html.EscapeString(m))
488 })
489 return s
490}
491
492func ontologize(s string) string {
493 s = re_hashes.ReplaceAllStringFunc(s, func(o string) string {
494 if o[0] == '&' {
495 return o
496 }
497 p := ""
498 h := o
499 if h[0] != '#' {
500 p = h[:1]
501 h = h[1:]
502 }
503 return fmt.Sprintf(`%s<a href="https://%s/o/%s">%s</a>`, p, serverName,
504 strings.ToLower(h[1:]), h)
505 })
506 return s
507}
508
509var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
510var re_urlhost = regexp.MustCompile("https://([^/ ]+)")
511
512func originate(u string) string {
513 m := re_urlhost.FindStringSubmatch(u)
514 if len(m) > 1 {
515 return m[1]
516 }
517 return ""
518}
519
520var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
521 var handle string
522 row := stmtGetXonker.QueryRow(xid, "handle")
523 err := row.Scan(&handle)
524 if err != nil {
525 log.Printf("need to get a handle: %s", xid)
526 info, err := investigate(xid)
527 if err != nil {
528 m := re_unurl.FindStringSubmatch(xid)
529 if len(m) > 2 {
530 handle = m[2]
531 } else {
532 handle = xid
533 }
534 } else {
535 handle = info.Name
536 }
537 }
538 return handle, true
539}})
540
541// handle, handle@host
542func handles(xid string) (string, string) {
543 if xid == "" {
544 return "", ""
545 }
546 var handle string
547 allhandles.Get(xid, &handle)
548 if handle == xid {
549 return xid, xid
550 }
551 return handle, handle + "@" + originate(xid)
552}
553
554func butnottooloud(aud []string) {
555 for i, a := range aud {
556 if strings.HasSuffix(a, "/followers") {
557 aud[i] = ""
558 }
559 }
560}
561
562func loudandproud(aud []string) bool {
563 for _, a := range aud {
564 if a == thewholeworld {
565 return true
566 }
567 }
568 return false
569}
570
571func firstclass(honk *Honk) bool {
572 return honk.Audience[0] == thewholeworld
573}
574
575func oneofakind(a []string) []string {
576 seen := make(map[string]bool)
577 seen[""] = true
578 j := 0
579 for _, s := range a {
580 if !seen[s] {
581 seen[s] = true
582 a[j] = s
583 j++
584 }
585 }
586 return a[:j]
587}
588
589var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
590 var user *WhatAbout
591 ok := somenumberedusers.Get(userid, &user)
592 if !ok {
593 return nil, false
594 }
595 ki := new(KeyInfo)
596 ki.keyname = user.URL + "#key"
597 ki.seckey = user.SecKey
598 return ki, true
599}})
600
601func ziggy(userid int64) *KeyInfo {
602 var ki *KeyInfo
603 ziggies.Get(userid, &ki)
604 return ki
605}
606
607var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
608 var data string
609 row := stmtGetXonker.QueryRow(keyname, "pubkey")
610 err := row.Scan(&data)
611 var key httpsig.PublicKey
612 if err != nil {
613 log.Printf("hitting the webs for missing pubkey: %s", keyname)
614 j, err := GetJunk(keyname)
615 if err != nil {
616 log.Printf("error getting %s pubkey: %s", keyname, err)
617 when := time.Now().UTC().Format(dbtimeformat)
618 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
619 return key, true
620 }
621 allinjest(originate(keyname), j)
622 row = stmtGetXonker.QueryRow(keyname, "pubkey")
623 err = row.Scan(&data)
624 if err != nil {
625 log.Printf("key not found after ingesting")
626 when := time.Now().UTC().Format(dbtimeformat)
627 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
628 return key, true
629 }
630 }
631 _, key, err = httpsig.DecodeKey(data)
632 if err != nil {
633 log.Printf("error decoding %s pubkey: %s", keyname, err)
634 return key, true
635 }
636 return key, true
637}, Limit: 512})
638
639func zaggy(keyname string) httpsig.PublicKey {
640 var key httpsig.PublicKey
641 zaggies.Get(keyname, &key)
642 return key
643}
644
645func savingthrow(keyname string) {
646 when := time.Now().UTC().Add(-30 * time.Minute).Format(dbtimeformat)
647 stmtDeleteXonker.Exec(keyname, "pubkey", when)
648 zaggies.Clear(keyname)
649}
650
651func keymatch(keyname string, actor string) string {
652 hash := strings.IndexByte(keyname, '#')
653 if hash == -1 {
654 hash = len(keyname)
655 }
656 owner := keyname[0:hash]
657 if owner == actor {
658 return originate(actor)
659 }
660 return ""
661}