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