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/rsa"
21 "crypto/sha512"
22 "fmt"
23 "html/template"
24 "io"
25 "log"
26 "net/http"
27 "net/url"
28 "os"
29 "regexp"
30 "strings"
31 "time"
32
33 "golang.org/x/net/html"
34 "humungus.tedunangst.com/r/webs/cache"
35 "humungus.tedunangst.com/r/webs/htfilter"
36 "humungus.tedunangst.com/r/webs/httpsig"
37 "humungus.tedunangst.com/r/webs/templates"
38)
39
40var allowedclasses = make(map[string]bool)
41
42func init() {
43 allowedclasses["kw"] = true
44 allowedclasses["bi"] = true
45 allowedclasses["st"] = true
46 allowedclasses["nm"] = true
47 allowedclasses["tp"] = true
48 allowedclasses["op"] = true
49 allowedclasses["cm"] = true
50 allowedclasses["al"] = true
51 allowedclasses["dl"] = true
52}
53
54func reverbolate(userid int64, honks []*Honk) {
55 for _, h := range honks {
56 h.What += "ed"
57 if h.What == "tonked" {
58 h.What = "honked back"
59 h.Style += " subtle"
60 }
61 if !h.Public {
62 h.Style += " limited"
63 }
64 translate(h, false)
65 if h.Whofore == 2 || h.Whofore == 3 {
66 h.URL = h.XID
67 if h.What != "bonked" {
68 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
69 h.Noise = mentionize(h.Noise)
70 h.Noise = ontologize(h.Noise)
71 }
72 h.Username, h.Handle = handles(h.Honker)
73 } else {
74 _, h.Handle = handles(h.Honker)
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 if h.URL == "" {
85 h.URL = h.XID
86 }
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
107 if userid == -1 {
108 if h.Precis != "" {
109 h.Open = ""
110 }
111 } else {
112 unsee(userid, h)
113 if h.Open == "open" && h.Precis == "unspecified horror" {
114 h.Precis = ""
115 }
116 }
117 if len(h.Noise) > 6000 && h.Open == "open" {
118 if h.Precis == "" {
119 h.Precis = "really freaking long"
120 }
121 h.Open = ""
122 }
123
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 return e
134 }
135 h.Precis = re_emus.ReplaceAllStringFunc(h.Precis, emuxifier)
136 h.Noise = re_emus.ReplaceAllStringFunc(h.Noise, emuxifier)
137
138 j := 0
139 for i := 0; i < len(h.Donks); i++ {
140 if !zap[h.Donks[i].XID] {
141 h.Donks[j] = h.Donks[i]
142 j++
143 }
144 }
145 h.Donks = h.Donks[:j]
146
147 h.HTPrecis = template.HTML(h.Precis)
148 h.HTML = template.HTML(h.Noise)
149 }
150}
151
152func replaceimgsand(zap map[string]bool, absolute bool) func(node *html.Node) string {
153 return func(node *html.Node) string {
154 src := htfilter.GetAttr(node, "src")
155 alt := htfilter.GetAttr(node, "alt")
156 //title := GetAttr(node, "title")
157 if htfilter.HasClass(node, "Emoji") && alt != "" {
158 return alt
159 }
160 d := finddonk(src)
161 if d != nil {
162 zap[d.XID] = true
163 base := ""
164 if absolute {
165 base = "https://" + serverName
166 }
167 return string(templates.Sprintf(`<img alt="%s" title="%s" src="%s/d/%s">`, alt, alt, base, d.XID))
168 }
169 return string(templates.Sprintf(`<img alt="%s" src="<a href="%s">%s<a>">`, alt, src, src))
170 }
171}
172
173func inlineimgsfor(honk *Honk) func(node *html.Node) string {
174 return func(node *html.Node) string {
175 src := htfilter.GetAttr(node, "src")
176 alt := htfilter.GetAttr(node, "alt")
177 d := savedonk(src, "image", alt, "image", true)
178 if d != nil {
179 honk.Donks = append(honk.Donks, d)
180 }
181 log.Printf("inline img with src: %s", src)
182 return ""
183 }
184}
185
186func imaginate(honk *Honk) {
187 var htf htfilter.Filter
188 htf.Imager = inlineimgsfor(honk)
189 htf.BaseURL, _ = url.Parse(honk.XID)
190 htf.String(honk.Noise)
191}
192
193func translate(honk *Honk, redoimages bool) {
194 if honk.Format == "html" {
195 return
196 }
197 noise := honk.Noise
198 if strings.HasPrefix(noise, "DZ:") {
199 idx := strings.Index(noise, "\n")
200 if idx == -1 {
201 honk.Precis = noise
202 noise = ""
203 } else {
204 honk.Precis = noise[:idx]
205 noise = noise[idx+1:]
206 }
207 }
208 honk.Precis = markitzero(strings.TrimSpace(honk.Precis))
209
210 noise = strings.TrimSpace(noise)
211 noise = markitzero(noise)
212 honk.Noise = noise
213 honk.Onts = oneofakind(ontologies(honk.Noise))
214
215 if redoimages {
216 zap := make(map[string]bool)
217 {
218 var htf htfilter.Filter
219 htf.Imager = replaceimgsand(zap, true)
220 htf.SpanClasses = allowedclasses
221 p, _ := htf.String(honk.Precis)
222 n, _ := htf.String(honk.Noise)
223 honk.Precis = string(p)
224 honk.Noise = string(n)
225 }
226 j := 0
227 for i := 0; i < len(honk.Donks); i++ {
228 if !zap[honk.Donks[i].XID] {
229 honk.Donks[j] = honk.Donks[i]
230 j++
231 }
232 }
233 honk.Donks = honk.Donks[:j]
234
235 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
236 honk.Noise = ontologize(mentionize(honk.Noise))
237 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
238 }
239}
240
241func xcelerate(b []byte) string {
242 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
243 for i, c := range b {
244 b[i] = letters[c&63]
245 }
246 s := string(b)
247 return s
248}
249
250func shortxid(xid string) string {
251 h := sha512.New512_256()
252 io.WriteString(h, xid)
253 return xcelerate(h.Sum(nil)[:20])
254}
255
256func xfiltrate() string {
257 var b [18]byte
258 rand.Read(b[:])
259 return xcelerate(b[:])
260}
261
262var re_hashes = regexp.MustCompile(`(?:^| |>)#[[:alnum:]]*[[:alpha:]][[:alnum:]_-]*`)
263
264func ontologies(s string) []string {
265 m := re_hashes.FindAllString(s, -1)
266 j := 0
267 for _, h := range m {
268 if h[0] == '&' {
269 continue
270 }
271 if h[0] != '#' {
272 h = h[1:]
273 }
274 m[j] = h
275 j++
276 }
277 return m[:j]
278}
279
280type Mention struct {
281 who string
282 where string
283}
284
285var re_mentions = regexp.MustCompile(`@[[:alnum:]._-]+@[[:alnum:].-]*[[:alnum:]]`)
286var re_urltions = regexp.MustCompile(`@https://\S+`)
287
288func grapevine(s string) []string {
289 var mentions []string
290 m := re_mentions.FindAllString(s, -1)
291 for i := range m {
292 where := gofish(m[i])
293 if where != "" {
294 mentions = append(mentions, where)
295 }
296 }
297 m = re_urltions.FindAllString(s, -1)
298 for i := range m {
299 mentions = append(mentions, m[i][1:])
300 }
301 return mentions
302}
303
304func bunchofgrapes(s string) []Mention {
305 m := re_mentions.FindAllString(s, -1)
306 var mentions []Mention
307 for i := range m {
308 where := gofish(m[i])
309 if where != "" {
310 mentions = append(mentions, Mention{who: m[i], where: where})
311 }
312 }
313 m = re_urltions.FindAllString(s, -1)
314 for i := range m {
315 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
316 }
317 return mentions
318}
319
320type Emu struct {
321 ID string
322 Name string
323}
324
325var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
326
327func herdofemus(noise string) []Emu {
328 m := re_emus.FindAllString(noise, -1)
329 m = oneofakind(m)
330 var emus []Emu
331 for _, e := range m {
332 fname := e[1 : len(e)-1]
333 _, err := os.Stat("emus/" + fname + ".png")
334 if err != nil {
335 continue
336 }
337 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
338 emus = append(emus, Emu{ID: url, Name: e})
339 }
340 return emus
341}
342
343var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
344var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
345
346func memetize(honk *Honk) {
347 repl := func(x string) string {
348 name := x[5:]
349 if name[0] == ' ' {
350 name = name[1:]
351 }
352 fd, err := os.Open("memes/" + name)
353 if err != nil {
354 log.Printf("no meme for %s", name)
355 return x
356 }
357 var peek [512]byte
358 n, _ := fd.Read(peek[:])
359 ct := http.DetectContentType(peek[:n])
360 fd.Close()
361
362 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
363 fileid, err := savefile("", name, name, url, ct, false, nil)
364 if err != nil {
365 log.Printf("error saving meme: %s", err)
366 return x
367 }
368 d := &Donk{
369 FileID: fileid,
370 XID: "",
371 Name: name,
372 Media: ct,
373 URL: url,
374 Local: false,
375 }
376 honk.Donks = append(honk.Donks, d)
377 return ""
378 }
379 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
380}
381
382var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n]|$)")
383
384func quickrename(s string, userid int64) string {
385 nonstop := true
386 for nonstop {
387 nonstop = false
388 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
389 prefix := ""
390 if m[0] == ' ' || m[0] == '\n' {
391 prefix = m[:1]
392 m = m[1:]
393 }
394 prefix += "@"
395 m = m[1:]
396 tail := ""
397 if m[len(m)-1] == ' ' || m[len(m)-1] == '\n' {
398 tail = m[len(m)-1:]
399 m = m[:len(m)-1]
400 }
401
402 xid := fullname(m, userid)
403
404 if xid != "" {
405 _, name := handles(xid)
406 if name != "" {
407 nonstop = true
408 m = name
409 }
410 }
411 return prefix + m + tail
412 })
413 }
414 return s
415}
416
417var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
418 honkers := gethonkers(userid)
419 m := make(map[string]string)
420 for _, h := range honkers {
421 m[h.XID] = h.Name
422 }
423 return m, true
424}, Invalidator: &honkerinvalidator})
425
426func shortname(userid int64, xid string) string {
427 var m map[string]string
428 ok := shortnames.Get(userid, &m)
429 if ok {
430 return m[xid]
431 }
432 return ""
433}
434
435var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
436 honkers := gethonkers(userid)
437 m := make(map[string]string)
438 for _, h := range honkers {
439 m[h.Name] = h.XID
440 }
441 return m, true
442}, Invalidator: &honkerinvalidator})
443
444func fullname(name string, userid int64) string {
445 var m map[string]string
446 ok := fullnames.Get(userid, &m)
447 if ok {
448 return m[name]
449 }
450 return ""
451}
452
453func mentionize(s string) string {
454 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
455 where := gofish(m)
456 if where == "" {
457 return m
458 }
459 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
460 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
461 html.EscapeString(where), html.EscapeString(who))
462 })
463 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
464 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
465 html.EscapeString(m[1:]), html.EscapeString(m))
466 })
467 return s
468}
469
470func ontologize(s string) string {
471 s = re_hashes.ReplaceAllStringFunc(s, func(o string) string {
472 if o[0] == '&' {
473 return o
474 }
475 p := ""
476 h := o
477 if h[0] != '#' {
478 p = h[:1]
479 h = h[1:]
480 }
481 return fmt.Sprintf(`%s<a href="https://%s/o/%s">%s</a>`, p, serverName,
482 strings.ToLower(h[1:]), h)
483 })
484 return s
485}
486
487var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
488var re_urlhost = regexp.MustCompile("https://([^/ ]+)")
489
490func originate(u string) string {
491 m := re_urlhost.FindStringSubmatch(u)
492 if len(m) > 1 {
493 return m[1]
494 }
495 return ""
496}
497
498var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
499 var handle string
500 row := stmtGetXonker.QueryRow(xid, "handle")
501 err := row.Scan(&handle)
502 if err != nil {
503 log.Printf("need to get a handle: %s", xid)
504 info, err := investigate(xid)
505 if err != nil {
506 m := re_unurl.FindStringSubmatch(xid)
507 if len(m) > 2 {
508 handle = m[2]
509 } else {
510 handle = xid
511 }
512 } else {
513 handle = info.Name
514 }
515 }
516 return handle, true
517}})
518
519// handle, handle@host
520func handles(xid string) (string, string) {
521 if xid == "" {
522 return "", ""
523 }
524 var handle string
525 allhandles.Get(xid, &handle)
526 if handle == xid {
527 return xid, xid
528 }
529 return handle, handle + "@" + originate(xid)
530}
531
532func butnottooloud(aud []string) {
533 for i, a := range aud {
534 if strings.HasSuffix(a, "/followers") {
535 aud[i] = ""
536 }
537 }
538}
539
540func loudandproud(aud []string) bool {
541 for _, a := range aud {
542 if a == thewholeworld {
543 return true
544 }
545 }
546 return false
547}
548
549func firstclass(honk *Honk) bool {
550 return honk.Audience[0] == thewholeworld
551}
552
553func oneofakind(a []string) []string {
554 seen := make(map[string]bool)
555 seen[""] = true
556 j := 0
557 for _, s := range a {
558 if !seen[s] {
559 seen[s] = true
560 a[j] = s
561 j++
562 }
563 }
564 return a[:j]
565}
566
567var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
568 var user *WhatAbout
569 ok := somenumberedusers.Get(userid, &user)
570 if !ok {
571 return nil, false
572 }
573 ki := new(KeyInfo)
574 ki.keyname = user.URL + "#key"
575 ki.seckey = user.SecKey
576 return ki, true
577}})
578
579func ziggy(userid int64) *KeyInfo {
580 var ki *KeyInfo
581 ziggies.Get(userid, &ki)
582 return ki
583}
584
585var zaggies = cache.New(cache.Options{Filler: func(keyname string) (*rsa.PublicKey, bool) {
586 var data string
587 row := stmtGetXonker.QueryRow(keyname, "pubkey")
588 err := row.Scan(&data)
589 if err != nil {
590 log.Printf("hitting the webs for missing pubkey: %s", keyname)
591 j, err := GetJunk(keyname)
592 if err != nil {
593 log.Printf("error getting %s pubkey: %s", keyname, err)
594 return nil, true
595 }
596 allinjest(originate(keyname), j)
597 row = stmtGetXonker.QueryRow(keyname, "pubkey")
598 err = row.Scan(&data)
599 if err != nil {
600 log.Printf("key not found after ingesting")
601 return nil, true
602 }
603 }
604 _, key, err := httpsig.DecodeKey(data)
605 if err != nil {
606 log.Printf("error decoding %s pubkey: %s", keyname, err)
607 return nil, true
608 }
609 return key, true
610}, Limit: 512})
611
612func zaggy(keyname string) *rsa.PublicKey {
613 var key *rsa.PublicKey
614 zaggies.Get(keyname, &key)
615 return key
616}
617
618func savingthrow(keyname string) {
619 when := time.Now().UTC().Add(-30 * time.Minute).Format(dbtimeformat)
620 stmtDeleteXonker.Exec(keyname, "pubkey", when)
621 zaggies.Clear(keyname)
622}
623
624func keymatch(keyname string, actor string) string {
625 hash := strings.IndexByte(keyname, '#')
626 if hash == -1 {
627 hash = len(keyname)
628 }
629 owner := keyname[0:hash]
630 if owner == actor {
631 return originate(actor)
632 }
633 return ""
634}