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/mz"
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)
65 local := false
66 if h.Whofore == 2 || h.Whofore == 3 {
67 local = true
68 }
69 if local && h.What != "bonked" {
70 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
71 }
72 h.Username, h.Handle = handles(h.Honker)
73 if !local {
74 short := shortname(userid, h.Honker)
75 if short != "" {
76 h.Username = short
77 } else {
78 h.Username = h.Handle
79 if len(h.Username) > 20 {
80 h.Username = h.Username[:20] + ".."
81 }
82 }
83 }
84 if h.URL == "" {
85 h.URL = h.XID
86 }
87 if h.Oonker != "" {
88 _, h.Oondle = handles(h.Oonker)
89 }
90 h.Precis = demoji(h.Precis)
91 h.Noise = demoji(h.Noise)
92 h.Open = "open"
93
94 zap := make(map[string]bool)
95 {
96 var htf htfilter.Filter
97 htf.Imager = replaceimgsand(zap, false)
98 htf.SpanClasses = allowedclasses
99 htf.BaseURL, _ = url.Parse(h.XID)
100 p, _ := htf.String(h.Precis)
101 n, _ := htf.String(h.Noise)
102 h.Precis = string(p)
103 h.Noise = string(n)
104 }
105 j := 0
106 for i := 0; i < len(h.Donks); i++ {
107 if !zap[h.Donks[i].XID] {
108 h.Donks[j] = h.Donks[i]
109 j++
110 }
111 }
112 h.Donks = h.Donks[:j]
113 }
114
115 unsee(honks, userid)
116
117 for _, h := range honks {
118 local := false
119 if h.Whofore == 2 || h.Whofore == 3 {
120 local = true
121 }
122 zap := make(map[string]bool)
123 emuxifier := func(e string) string {
124 for _, d := range h.Donks {
125 if d.Name == e {
126 zap[d.XID] = true
127 if d.Local {
128 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
129 }
130 }
131 }
132 if local && h.What != "bonked" {
133 var emu Emu
134 emucache.Get(e, &emu)
135 if emu.ID != "" {
136 return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, emu.Name, emu.ID)
137 }
138 }
139 return e
140 }
141 renderflags(h)
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 filterchonk(ch *Chonk) {
181 var htf htfilter.Filter
182 htf.SpanClasses = allowedclasses
183 htf.BaseURL, _ = url.Parse(ch.XID)
184 noise := ch.Noise
185 if ch.Format == "markdown" {
186 noise = markitzero(noise)
187 }
188 ch.HTML, _ = htf.String(noise)
189 n := string(ch.HTML)
190 if strings.HasPrefix(n, "<p>") {
191 ch.HTML = template.HTML(n[3:])
192 }
193 if short := shortname(ch.UserID, ch.Who); short != "" {
194 ch.Handle = short
195 } else {
196 ch.Handle, _ = handles(ch.Who)
197 }
198
199}
200
201func inlineimgsfor(honk *Honk) func(node *html.Node) string {
202 return func(node *html.Node) string {
203 src := htfilter.GetAttr(node, "src")
204 alt := htfilter.GetAttr(node, "alt")
205 d := savedonk(src, "image", alt, "image", true)
206 if d != nil {
207 honk.Donks = append(honk.Donks, d)
208 }
209 log.Printf("inline img with src: %s", src)
210 return ""
211 }
212}
213
214func imaginate(honk *Honk) {
215 var htf htfilter.Filter
216 htf.Imager = inlineimgsfor(honk)
217 htf.BaseURL, _ = url.Parse(honk.XID)
218 htf.String(honk.Noise)
219}
220
221func translate(honk *Honk) {
222 if honk.Format == "html" {
223 return
224 }
225 noise := honk.Noise
226 if strings.HasPrefix(noise, "DZ:") {
227 idx := strings.Index(noise, "\n")
228 if idx == -1 {
229 honk.Precis = noise
230 noise = ""
231 } else {
232 honk.Precis = noise[:idx]
233 noise = noise[idx+1:]
234 }
235 }
236 honk.Precis = markitzero(strings.TrimSpace(honk.Precis))
237
238 var marker mz.Marker
239 marker.HashLinker = ontoreplacer
240 marker.AtLinker = attoreplacer
241 noise = strings.TrimSpace(noise)
242 noise = marker.Mark(noise)
243 honk.Noise = noise
244 honk.Onts = oneofakind(marker.HashTags)
245 honk.Mentions = bunchofgrapes(marker.Mentions)
246}
247
248func redoimages(honk *Honk) {
249 zap := make(map[string]bool)
250 {
251 var htf htfilter.Filter
252 htf.Imager = replaceimgsand(zap, true)
253 htf.SpanClasses = allowedclasses
254 p, _ := htf.String(honk.Precis)
255 n, _ := htf.String(honk.Noise)
256 honk.Precis = string(p)
257 honk.Noise = string(n)
258 }
259 j := 0
260 for i := 0; i < len(honk.Donks); i++ {
261 if !zap[honk.Donks[i].XID] {
262 honk.Donks[j] = honk.Donks[i]
263 j++
264 }
265 }
266 honk.Donks = honk.Donks[:j]
267
268 honk.Noise = re_memes.ReplaceAllString(honk.Noise, "")
269 honk.Noise = strings.Replace(honk.Noise, "<a href=", "<a class=\"mention u-url\" href=", -1)
270}
271
272func xcelerate(b []byte) string {
273 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
274 for i, c := range b {
275 b[i] = letters[c&63]
276 }
277 s := string(b)
278 return s
279}
280
281func shortxid(xid string) string {
282 h := sha512.New512_256()
283 io.WriteString(h, xid)
284 return xcelerate(h.Sum(nil)[:20])
285}
286
287func xfiltrate() string {
288 var b [18]byte
289 rand.Read(b[:])
290 return xcelerate(b[:])
291}
292
293func grapevine(mentions []Mention) []string {
294 var s []string
295 for _, m := range mentions {
296 s = append(s, m.Where)
297 }
298 return s
299}
300
301func bunchofgrapes(m []string) []Mention {
302 var mentions []Mention
303 for i := range m {
304 where := gofish(m[i])
305 if where != "" {
306 mentions = append(mentions, Mention{Who: m[i], Where: where})
307 }
308 }
309 return mentions
310}
311
312type Emu struct {
313 ID string
314 Name string
315}
316
317var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
318
319var emucache = cache.New(cache.Options{Filler: func(ename string) (Emu, bool) {
320 fname := ename[1 : len(ename)-1]
321 _, err := os.Stat(dataDir + "/emus/" + fname + ".png")
322 if err != nil {
323 return Emu{Name: ename, ID: ""}, true
324 }
325 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
326 return Emu{ID: url, Name: ename}, true
327}, Duration: 10 * time.Second})
328
329func herdofemus(noise string) []Emu {
330 m := re_emus.FindAllString(noise, -1)
331 m = oneofakind(m)
332 var emus []Emu
333 for _, e := range m {
334 var emu Emu
335 emucache.Get(e, &emu)
336 if emu.ID == "" {
337 continue
338 }
339 emus = append(emus, emu)
340 }
341 return emus
342}
343
344var re_memes = regexp.MustCompile("meme: ?([^\n]+)")
345var re_avatar = regexp.MustCompile("avatar: ?([^\n]+)")
346
347func memetize(honk *Honk) {
348 repl := func(x string) string {
349 name := x[5:]
350 if name[0] == ' ' {
351 name = name[1:]
352 }
353 fd, err := os.Open("memes/" + name)
354 if err != nil {
355 log.Printf("no meme for %s", name)
356 return x
357 }
358 var peek [512]byte
359 n, _ := fd.Read(peek[:])
360 ct := http.DetectContentType(peek[:n])
361 fd.Close()
362
363 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
364 fileid, err := savefile("", name, name, url, ct, false, nil)
365 if err != nil {
366 log.Printf("error saving meme: %s", err)
367 return x
368 }
369 d := &Donk{
370 FileID: fileid,
371 XID: "",
372 Name: name,
373 Media: ct,
374 URL: url,
375 Local: false,
376 }
377 honk.Donks = append(honk.Donks, d)
378 return ""
379 }
380 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
381}
382
383var re_quickmention = regexp.MustCompile("(^|[ \n])@[[:alnum:]]+([ \n.]|$)")
384
385func quickrename(s string, userid int64) string {
386 nonstop := true
387 for nonstop {
388 nonstop = false
389 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
390 prefix := ""
391 if m[0] == ' ' || m[0] == '\n' {
392 prefix = m[:1]
393 m = m[1:]
394 }
395 prefix += "@"
396 m = m[1:]
397 tail := ""
398 if last := m[len(m)-1]; last == ' ' || last == '\n' || last == '.' {
399 tail = m[len(m)-1:]
400 m = m[:len(m)-1]
401 }
402
403 xid := fullname(m, userid)
404
405 if xid != "" {
406 _, name := handles(xid)
407 if name != "" {
408 nonstop = true
409 m = name
410 }
411 }
412 return prefix + m + tail
413 })
414 }
415 return s
416}
417
418var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
419 honkers := gethonkers(userid)
420 m := make(map[string]string)
421 for _, h := range honkers {
422 m[h.XID] = h.Name
423 }
424 return m, true
425}, Invalidator: &honkerinvalidator})
426
427func shortname(userid int64, xid string) string {
428 var m map[string]string
429 ok := shortnames.Get(userid, &m)
430 if ok {
431 return m[xid]
432 }
433 return ""
434}
435
436var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
437 honkers := gethonkers(userid)
438 m := make(map[string]string)
439 for _, h := range honkers {
440 m[h.Name] = h.XID
441 }
442 return m, true
443}, Invalidator: &honkerinvalidator})
444
445func fullname(name string, userid int64) string {
446 var m map[string]string
447 ok := fullnames.Get(userid, &m)
448 if ok {
449 return m[name]
450 }
451 return ""
452}
453
454func attoreplacer(m string) string {
455 fill := `<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`
456 where := gofish(m)
457 if where == "" {
458 return m
459 }
460 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
461 return fmt.Sprintf(fill, html.EscapeString(where), html.EscapeString(who))
462}
463
464func ontoreplacer(h string) string {
465 return fmt.Sprintf(`<a href="https://%s/o/%s">%s</a>`, serverName,
466 strings.ToLower(h[1:]), h)
467}
468
469var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
470var re_urlhost = regexp.MustCompile("https://([^/ #]+)")
471
472func originate(u string) string {
473 m := re_urlhost.FindStringSubmatch(u)
474 if len(m) > 1 {
475 return m[1]
476 }
477 return ""
478}
479
480var allhandles = cache.New(cache.Options{Filler: func(xid string) (string, bool) {
481 var handle string
482 row := stmtGetXonker.QueryRow(xid, "handle")
483 err := row.Scan(&handle)
484 if err != nil {
485 log.Printf("need to get a handle: %s", xid)
486 info, err := investigate(xid)
487 if err != nil {
488 m := re_unurl.FindStringSubmatch(xid)
489 if len(m) > 2 {
490 handle = m[2]
491 } else {
492 handle = xid
493 }
494 } else {
495 handle = info.Name
496 }
497 }
498 return handle, true
499}})
500
501// handle, handle@host
502func handles(xid string) (string, string) {
503 if xid == "" {
504 return "", ""
505 }
506 var handle string
507 allhandles.Get(xid, &handle)
508 if handle == xid {
509 return xid, xid
510 }
511 return handle, handle + "@" + originate(xid)
512}
513
514func butnottooloud(aud []string) {
515 for i, a := range aud {
516 if strings.HasSuffix(a, "/followers") {
517 aud[i] = ""
518 }
519 }
520}
521
522func loudandproud(aud []string) bool {
523 for _, a := range aud {
524 if a == thewholeworld {
525 return true
526 }
527 }
528 return false
529}
530
531func firstclass(honk *Honk) bool {
532 return honk.Audience[0] == thewholeworld
533}
534
535func oneofakind(a []string) []string {
536 seen := make(map[string]bool)
537 seen[""] = true
538 j := 0
539 for _, s := range a {
540 if !seen[s] {
541 seen[s] = true
542 a[j] = s
543 j++
544 }
545 }
546 return a[:j]
547}
548
549var ziggies = cache.New(cache.Options{Filler: func(userid int64) (*KeyInfo, bool) {
550 var user *WhatAbout
551 ok := somenumberedusers.Get(userid, &user)
552 if !ok {
553 return nil, false
554 }
555 ki := new(KeyInfo)
556 ki.keyname = user.URL + "#key"
557 ki.seckey = user.SecKey
558 return ki, true
559}})
560
561func ziggy(userid int64) *KeyInfo {
562 var ki *KeyInfo
563 ziggies.Get(userid, &ki)
564 return ki
565}
566
567var zaggies = cache.New(cache.Options{Filler: func(keyname string) (httpsig.PublicKey, bool) {
568 var data string
569 row := stmtGetXonker.QueryRow(keyname, "pubkey")
570 err := row.Scan(&data)
571 var key httpsig.PublicKey
572 if err != nil {
573 log.Printf("hitting the webs for missing pubkey: %s", keyname)
574 j, err := GetJunk(keyname)
575 if err != nil {
576 log.Printf("error getting %s pubkey: %s", keyname, err)
577 when := time.Now().UTC().Format(dbtimeformat)
578 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
579 return key, true
580 }
581 allinjest(originate(keyname), j)
582 row = stmtGetXonker.QueryRow(keyname, "pubkey")
583 err = row.Scan(&data)
584 if err != nil {
585 log.Printf("key not found after ingesting")
586 when := time.Now().UTC().Format(dbtimeformat)
587 stmtSaveXonker.Exec(keyname, "failed", "pubkey", when)
588 return key, true
589 }
590 }
591 _, key, err = httpsig.DecodeKey(data)
592 if err != nil {
593 log.Printf("error decoding %s pubkey: %s", keyname, err)
594 return key, true
595 }
596 return key, true
597}, Limit: 512})
598
599func zaggy(keyname string) httpsig.PublicKey {
600 var key httpsig.PublicKey
601 zaggies.Get(keyname, &key)
602 return key
603}
604
605func savingthrow(keyname string) {
606 when := time.Now().UTC().Add(-30 * time.Minute).Format(dbtimeformat)
607 stmtDeleteXonker.Exec(keyname, "pubkey", when)
608 zaggies.Clear(keyname)
609}
610
611func keymatch(keyname string, actor string) string {
612 hash := strings.IndexByte(keyname, '#')
613 if hash == -1 {
614 hash = len(keyname)
615 }
616 owner := keyname[0:hash]
617 if owner == actor {
618 return originate(actor)
619 }
620 return ""
621}