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
280var re_mentions = regexp.MustCompile(`@[[:alnum:]._-]+@[[:alnum:].-]*[[:alnum:]]`)
281var re_urltions = regexp.MustCompile(`@https://\S+`)
282
283func grapevine(s string) []string {
284 var mentions []string
285 m := re_mentions.FindAllString(s, -1)
286 for i := range m {
287 where := gofish(m[i])
288 if where != "" {
289 mentions = append(mentions, where)
290 }
291 }
292 m = re_urltions.FindAllString(s, -1)
293 for i := range m {
294 mentions = append(mentions, m[i][1:])
295 }
296 return mentions
297}
298
299func bunchofgrapes(s string) []Mention {
300 m := re_mentions.FindAllString(s, -1)
301 var mentions []Mention
302 for i := range m {
303 where := gofish(m[i])
304 if where != "" {
305 mentions = append(mentions, Mention{Who: m[i], Where: where})
306 }
307 }
308 m = re_urltions.FindAllString(s, -1)
309 for i := range m {
310 mentions = append(mentions, Mention{Who: m[i][1:], Where: m[i][1:]})
311 }
312 return mentions
313}
314
315type Emu struct {
316 ID string
317 Name string
318}
319
320var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
321
322func herdofemus(noise string) []Emu {
323 m := re_emus.FindAllString(noise, -1)
324 m = oneofakind(m)
325 var emus []Emu
326 for _, e := range m {
327 fname := e[1 : len(e)-1]
328 _, err := os.Stat("emus/" + fname + ".png")
329 if err != nil {
330 continue
331 }
332 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
333 emus = append(emus, Emu{ID: url, Name: e})
334 }
335 return emus
336}
337
338var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
339var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
340
341func memetize(honk *Honk) {
342 repl := func(x string) string {
343 name := x[5:]
344 if name[0] == ' ' {
345 name = name[1:]
346 }
347 fd, err := os.Open("memes/" + name)
348 if err != nil {
349 log.Printf("no meme for %s", name)
350 return x
351 }
352 var peek [512]byte
353 n, _ := fd.Read(peek[:])
354 ct := http.DetectContentType(peek[:n])
355 fd.Close()
356
357 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
358 fileid, err := savefile("", name, name, url, ct, false, nil)
359 if err != nil {
360 log.Printf("error saving meme: %s", err)
361 return x
362 }
363 d := &Donk{
364 FileID: fileid,
365 XID: "",
366 Name: name,
367 Media: ct,
368 URL: url,
369 Local: false,
370 }
371 honk.Donks = append(honk.Donks, d)
372 return ""
373 }
374 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
375}
376
377var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n]|$)")
378
379func quickrename(s string, userid int64) string {
380 nonstop := true
381 for nonstop {
382 nonstop = false
383 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
384 prefix := ""
385 if m[0] == ' ' || m[0] == '\n' {
386 prefix = m[:1]
387 m = m[1:]
388 }
389 prefix += "@"
390 m = m[1:]
391 tail := ""
392 if m[len(m)-1] == ' ' || m[len(m)-1] == '\n' {
393 tail = m[len(m)-1:]
394 m = m[:len(m)-1]
395 }
396
397 xid := fullname(m, userid)
398
399 if xid != "" {
400 _, name := handles(xid)
401 if name != "" {
402 nonstop = true
403 m = name
404 }
405 }
406 return prefix + m + tail
407 })
408 }
409 return s
410}
411
412var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
413 honkers := gethonkers(userid)
414 m := make(map[string]string)
415 for _, h := range honkers {
416 m[h.XID] = h.Name
417 }
418 return m, true
419}, Invalidator: &honkerinvalidator})
420
421func shortname(userid int64, xid string) string {
422 var m map[string]string
423 ok := shortnames.Get(userid, &m)
424 if ok {
425 return m[xid]
426 }
427 return ""
428}
429
430var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
431 honkers := gethonkers(userid)
432 m := make(map[string]string)
433 for _, h := range honkers {
434 m[h.Name] = h.XID
435 }
436 return m, true
437}, Invalidator: &honkerinvalidator})
438
439func fullname(name string, userid int64) string {
440 var m map[string]string
441 ok := fullnames.Get(userid, &m)
442 if ok {
443 return m[name]
444 }
445 return ""
446}
447
448func mentionize(s string) string {
449 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
450 where := gofish(m)
451 if where == "" {
452 return m
453 }
454 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
455 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
456 html.EscapeString(where), html.EscapeString(who))
457 })
458 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
459 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
460 html.EscapeString(m[1:]), html.EscapeString(m))
461 })
462 return s
463}
464
465func ontologize(s string) string {
466 s = re_hashes.ReplaceAllStringFunc(s, func(o string) string {
467 if o[0] == '&' {
468 return o
469 }
470 p := ""
471 h := o
472 if h[0] != '#' {
473 p = h[:1]
474 h = h[1:]
475 }
476 return fmt.Sprintf(`%s<a href="https://%s/o/%s">%s</a>`, p, serverName,
477 strings.ToLower(h[1:]), h)
478 })
479 return s
480}
481
482var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
483var re_urlhost = regexp.MustCompile("https://([^/ ]+)")
484
485func originate(u string) string {
486 m := re_urlhost.FindStringSubmatch(u)
487 if len(m) > 1 {
488 return m[1]
489 }
490 return ""
491}
492
493var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
494 var handle string
495 row := stmtGetXonker.QueryRow(xid, "handle")
496 err := row.Scan(&handle)
497 if err != nil {
498 log.Printf("need to get a handle: %s", xid)
499 info, err := investigate(xid)
500 if err != nil {
501 m := re_unurl.FindStringSubmatch(xid)
502 if len(m) > 2 {
503 handle = m[2]
504 } else {
505 handle = xid
506 }
507 } else {
508 handle = info.Name
509 }
510 }
511 return handle, true
512}})
513
514// handle, handle@host
515func handles(xid string) (string, string) {
516 if xid == "" {
517 return "", ""
518 }
519 var handle string
520 allhandles.Get(xid, &handle)
521 if handle == xid {
522 return xid, xid
523 }
524 return handle, handle + "@" + originate(xid)
525}
526
527func butnottooloud(aud []string) {
528 for i, a := range aud {
529 if strings.HasSuffix(a, "/followers") {
530 aud[i] = ""
531 }
532 }
533}
534
535func loudandproud(aud []string) bool {
536 for _, a := range aud {
537 if a == thewholeworld {
538 return true
539 }
540 }
541 return false
542}
543
544func firstclass(honk *Honk) bool {
545 return honk.Audience[0] == thewholeworld
546}
547
548func oneofakind(a []string) []string {
549 seen := make(map[string]bool)
550 seen[""] = true
551 j := 0
552 for _, s := range a {
553 if !seen[s] {
554 seen[s] = true
555 a[j] = s
556 j++
557 }
558 }
559 return a[:j]
560}
561
562var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
563 var user *WhatAbout
564 ok := somenumberedusers.Get(userid, &user)
565 if !ok {
566 return nil, false
567 }
568 ki := new(KeyInfo)
569 ki.keyname = user.URL + "#key"
570 ki.seckey = user.SecKey
571 return ki, true
572}})
573
574func ziggy(userid int64) *KeyInfo {
575 var ki *KeyInfo
576 ziggies.Get(userid, &ki)
577 return ki
578}
579
580var zaggies = cache.New(cache.Options{Filler: func(keyname string) (*rsa.PublicKey, bool) {
581 var data string
582 row := stmtGetXonker.QueryRow(keyname, "pubkey")
583 err := row.Scan(&data)
584 if err != nil {
585 log.Printf("hitting the webs for missing pubkey: %s", keyname)
586 j, err := GetJunk(keyname)
587 if err != nil {
588 log.Printf("error getting %s pubkey: %s", keyname, err)
589 return nil, true
590 }
591 allinjest(originate(keyname), j)
592 row = stmtGetXonker.QueryRow(keyname, "pubkey")
593 err = row.Scan(&data)
594 if err != nil {
595 log.Printf("key not found after ingesting")
596 return nil, true
597 }
598 }
599 _, key, err := httpsig.DecodeKey(data)
600 if err != nil {
601 log.Printf("error decoding %s pubkey: %s", keyname, err)
602 return nil, true
603 }
604 return key, true
605}, Limit: 512})
606
607func zaggy(keyname string) *rsa.PublicKey {
608 var key *rsa.PublicKey
609 zaggies.Get(keyname, &key)
610 return key
611}
612
613func savingthrow(keyname string) {
614 when := time.Now().UTC().Add(-30 * time.Minute).Format(dbtimeformat)
615 stmtDeleteXonker.Exec(keyname, "pubkey", when)
616 zaggies.Clear(keyname)
617}
618
619func keymatch(keyname string, actor string) string {
620 hash := strings.IndexByte(keyname, '#')
621 if hash == -1 {
622 hash = len(keyname)
623 }
624 owner := keyname[0:hash]
625 if owner == actor {
626 return originate(actor)
627 }
628 return ""
629}