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