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 "fmt"
22 "html/template"
23 "log"
24 "net/http"
25 "os"
26 "regexp"
27 "strings"
28 "sync"
29
30 "golang.org/x/net/html"
31 "humungus.tedunangst.com/r/webs/cache"
32 "humungus.tedunangst.com/r/webs/htfilter"
33 "humungus.tedunangst.com/r/webs/httpsig"
34 "humungus.tedunangst.com/r/webs/templates"
35)
36
37var allowedclasses = make(map[string]bool)
38
39func init() {
40 allowedclasses["kw"] = true
41 allowedclasses["bi"] = true
42 allowedclasses["st"] = true
43 allowedclasses["nm"] = true
44 allowedclasses["tp"] = true
45 allowedclasses["op"] = true
46 allowedclasses["cm"] = true
47 allowedclasses["al"] = true
48 allowedclasses["dl"] = true
49}
50
51func reverbolate(userid int64, honks []*Honk) {
52 for _, h := range honks {
53 h.What += "ed"
54 if h.What == "tonked" {
55 h.What = "honked back"
56 h.Style = "subtle"
57 }
58 if !h.Public {
59 h.Style += " limited"
60 }
61 translate(h)
62 if h.Whofore == 2 || h.Whofore == 3 {
63 h.URL = h.XID
64 if h.What != "bonked" {
65 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
66 h.Noise = mentionize(h.Noise)
67 h.Noise = ontologize(h.Noise)
68 }
69 h.Username, h.Handle = handles(h.Honker)
70 } else {
71 _, h.Handle = handles(h.Honker)
72 short := shortname(userid, h.Honker)
73 if short != "" {
74 h.Username = short
75 } else {
76 h.Username = h.Handle
77 if len(h.Username) > 20 {
78 h.Username = h.Username[:20] + ".."
79 }
80 }
81 if h.URL == "" {
82 h.URL = h.XID
83 }
84 }
85 if h.Oonker != "" {
86 _, h.Oondle = handles(h.Oonker)
87 }
88 h.Precis = demoji(h.Precis)
89 h.Noise = demoji(h.Noise)
90 h.Open = "open"
91
92 zap := make(map[string]bool)
93 {
94 filt := htfilter.New()
95 filt.Imager = replaceimgsand(zap)
96 filt.SpanClasses = allowedclasses
97 p, _ := filt.String(h.Precis)
98 n, _ := filt.String(h.Noise)
99 h.Precis = string(p)
100 h.Noise = string(n)
101 }
102
103 if userid == -1 {
104 if h.Precis != "" {
105 h.Open = ""
106 }
107 } else {
108 unsee(userid, h)
109 if h.Open == "open" && h.Precis == "unspecified horror" {
110 h.Precis = ""
111 }
112 }
113 if len(h.Noise) > 6000 && h.Open == "open" {
114 if h.Precis == "" {
115 h.Precis = "really freaking long"
116 }
117 h.Open = ""
118 }
119
120 emuxifier := func(e string) string {
121 for _, d := range h.Donks {
122 if d.Name == e {
123 zap[d.XID] = true
124 if d.Local {
125 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
126 }
127 }
128 }
129 return e
130 }
131 h.Precis = re_emus.ReplaceAllStringFunc(h.Precis, emuxifier)
132 h.Noise = re_emus.ReplaceAllStringFunc(h.Noise, emuxifier)
133
134 j := 0
135 for i := 0; i < len(h.Donks); i++ {
136 if !zap[h.Donks[i].XID] {
137 h.Donks[j] = h.Donks[i]
138 j++
139 }
140 }
141 h.Donks = h.Donks[:j]
142
143 h.HTPrecis = template.HTML(h.Precis)
144 h.HTML = template.HTML(h.Noise)
145 }
146}
147
148func replaceimgsand(zap map[string]bool) func(node *html.Node) string {
149 return func(node *html.Node) string {
150 src := htfilter.GetAttr(node, "src")
151 alt := htfilter.GetAttr(node, "alt")
152 //title := GetAttr(node, "title")
153 if htfilter.HasClass(node, "Emoji") && alt != "" {
154 return alt
155 }
156 d := finddonk(src)
157 if d != nil {
158 zap[d.XID] = true
159 return string(templates.Sprintf(`<img alt="%s" title="%s" src="/d/%s">`, alt, alt, d.XID))
160 }
161 return string(templates.Sprintf(`<img alt="%s" src="<a href="%s">%s<a>">`, alt, src, src))
162 }
163}
164
165func inlineimgsfor(honk *Honk) func(node *html.Node) string {
166 return func(node *html.Node) string {
167 src := htfilter.GetAttr(node, "src")
168 alt := htfilter.GetAttr(node, "alt")
169 if !strings.HasPrefix(src, "https://"+serverName+"/") {
170 d := savedonk(src, "image", alt, "image", true)
171 if d != nil {
172 honk.Donks = append(honk.Donks, d)
173 }
174 }
175 log.Printf("inline img with src: %s", src)
176 return ""
177 }
178}
179
180func translate(honk *Honk) {
181 if honk.Format == "html" {
182 return
183 }
184 noise := honk.Noise
185 if strings.HasPrefix(noise, "DZ:") {
186 idx := strings.Index(noise, "\n")
187 if idx == -1 {
188 honk.Precis = noise
189 noise = ""
190 } else {
191 honk.Precis = noise[:idx]
192 noise = noise[idx+1:]
193 }
194 }
195 honk.Precis = strings.TrimSpace(honk.Precis)
196
197 noise = strings.TrimSpace(noise)
198 noise = quickrename(noise, honk.UserID)
199 noise = markitzero(noise)
200
201 honk.Noise = noise
202 honk.Onts = oneofakind(ontologies(honk.Noise))
203}
204
205func shortxid(xid string) string {
206 idx := strings.LastIndexByte(xid, '/')
207 if idx == -1 {
208 return xid
209 }
210 return xid[idx+1:]
211}
212
213func xfiltrate() string {
214 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
215 var b [18]byte
216 rand.Read(b[:])
217 for i, c := range b {
218 b[i] = letters[c&63]
219 }
220 s := string(b[:])
221 return s
222}
223
224var re_hashes = regexp.MustCompile(`(?:^| )#[[:alnum:]][[:alnum:]_-]*`)
225
226func ontologies(s string) []string {
227 m := re_hashes.FindAllString(s, -1)
228 j := 0
229 for _, h := range m {
230 if h[0] == '&' {
231 continue
232 }
233 if h[0] != '#' {
234 h = h[1:]
235 }
236 m[j] = h
237 j++
238 }
239 return m[:j]
240}
241
242type Mention struct {
243 who string
244 where string
245}
246
247var re_mentions = regexp.MustCompile(`@[[:alnum:]._-]+@[[:alnum:].-]*[[:alnum:]]`)
248var re_urltions = regexp.MustCompile(`@https://\S+`)
249
250func grapevine(s string) []string {
251 var mentions []string
252 m := re_mentions.FindAllString(s, -1)
253 for i := range m {
254 where := gofish(m[i])
255 if where != "" {
256 mentions = append(mentions, where)
257 }
258 }
259 m = re_urltions.FindAllString(s, -1)
260 for i := range m {
261 mentions = append(mentions, m[i][1:])
262 }
263 return mentions
264}
265
266func bunchofgrapes(s string) []Mention {
267 m := re_mentions.FindAllString(s, -1)
268 var mentions []Mention
269 for i := range m {
270 where := gofish(m[i])
271 if where != "" {
272 mentions = append(mentions, Mention{who: m[i], where: where})
273 }
274 }
275 m = re_urltions.FindAllString(s, -1)
276 for i := range m {
277 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
278 }
279 return mentions
280}
281
282type Emu struct {
283 ID string
284 Name string
285}
286
287var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
288
289func herdofemus(noise string) []Emu {
290 m := re_emus.FindAllString(noise, -1)
291 m = oneofakind(m)
292 var emus []Emu
293 for _, e := range m {
294 fname := e[1 : len(e)-1]
295 _, err := os.Stat("emus/" + fname + ".png")
296 if err != nil {
297 continue
298 }
299 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
300 emus = append(emus, Emu{ID: url, Name: e})
301 }
302 return emus
303}
304
305var re_memes = regexp.MustCompile("meme: ?([[:alnum:]_.-]+)")
306
307func memetize(honk *Honk) {
308 repl := func(x string) string {
309 name := x[5:]
310 if name[0] == ' ' {
311 name = name[1:]
312 }
313 fd, err := os.Open("memes/" + name)
314 if err != nil {
315 log.Printf("no meme for %s", name)
316 return x
317 }
318 var peek [512]byte
319 n, _ := fd.Read(peek[:])
320 ct := http.DetectContentType(peek[:n])
321 fd.Close()
322
323 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
324 fileid, err := savefile("", name, name, url, ct, false, nil)
325 if err != nil {
326 log.Printf("error saving meme: %s", err)
327 return x
328 }
329 d := &Donk{
330 FileID: fileid,
331 XID: "",
332 Name: name,
333 Media: ct,
334 URL: url,
335 Local: false,
336 }
337 honk.Donks = append(honk.Donks, d)
338 return ""
339 }
340 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
341}
342
343var re_quickmention = regexp.MustCompile("(^| )@[[:alnum:]]+( |$)")
344
345func quickrename(s string, userid int64) string {
346 nonstop := true
347 for nonstop {
348 nonstop = false
349 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
350 prefix := ""
351 if m[0] == ' ' {
352 prefix = " "
353 m = m[1:]
354 }
355 prefix += "@"
356 m = m[1:]
357 if m[len(m)-1] == ' ' {
358 m = m[:len(m)-1]
359 }
360
361 xid := fullname(m, userid)
362
363 if xid != "" {
364 _, name := handles(xid)
365 if name != "" {
366 nonstop = true
367 m = name
368 }
369 }
370 return prefix + m + " "
371 })
372 }
373 return s
374}
375
376var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
377 honkers := gethonkers(userid)
378 m := make(map[string]string)
379 for _, h := range honkers {
380 m[h.XID] = h.Name
381 }
382 return m, true
383}, Invalidator: &honkerinvalidator})
384
385func shortname(userid int64, xid string) string {
386 var m map[string]string
387 ok := shortnames.Get(userid, &m)
388 if ok {
389 return m[xid]
390 }
391 return ""
392}
393
394var fullnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
395 honkers := gethonkers(userid)
396 m := make(map[string]string)
397 for _, h := range honkers {
398 m[h.Name] = h.XID
399 }
400 return m, true
401}, Invalidator: &honkerinvalidator})
402
403func fullname(name string, userid int64) string {
404 var m map[string]string
405 ok := fullnames.Get(userid, &m)
406 if ok {
407 return m[name]
408 }
409 return ""
410}
411
412func mentionize(s string) string {
413 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
414 where := gofish(m)
415 if where == "" {
416 return m
417 }
418 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
419 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
420 html.EscapeString(where), html.EscapeString(who))
421 })
422 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
423 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
424 html.EscapeString(m[1:]), html.EscapeString(m))
425 })
426 return s
427}
428
429func ontologize(s string) string {
430 s = re_hashes.ReplaceAllStringFunc(s, func(o string) string {
431 if o[0] == '&' {
432 return o
433 }
434 p := ""
435 h := o
436 if h[0] != '#' {
437 p = h[:1]
438 h = h[1:]
439 }
440 return fmt.Sprintf(`%s<a class="mention u-url" href="https://%s/o/%s">%s</a>`, p, serverName,
441 strings.ToLower(h[1:]), h)
442 })
443 return s
444}
445
446var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
447var re_urlhost = regexp.MustCompile("https://([^/ ]+)")
448
449func originate(u string) string {
450 m := re_urlhost.FindStringSubmatch(u)
451 if len(m) > 1 {
452 return m[1]
453 }
454 return ""
455}
456
457var allhandles = make(map[string]string)
458var handlelock sync.Mutex
459
460// handle, handle@host
461func handles(xid string) (string, string) {
462 if xid == "" {
463 return "", ""
464 }
465 handlelock.Lock()
466 handle := allhandles[xid]
467 handlelock.Unlock()
468 if handle == "" {
469 handle = findhandle(xid)
470 handlelock.Lock()
471 allhandles[xid] = handle
472 handlelock.Unlock()
473 }
474 if handle == xid {
475 return xid, xid
476 }
477 return handle, handle + "@" + originate(xid)
478}
479
480func findhandle(xid string) string {
481 row := stmtGetXonker.QueryRow(xid, "handle")
482 var handle string
483 err := row.Scan(&handle)
484 if err != nil {
485 p, _ := investigate(xid)
486 if p == nil {
487 m := re_unurl.FindStringSubmatch(xid)
488 if len(m) > 2 {
489 handle = m[2]
490 } else {
491 handle = xid
492 }
493 } else {
494 handle = p.Handle
495 }
496 _, err = stmtSaveXonker.Exec(xid, handle, "handle")
497 if err != nil {
498 log.Printf("error saving handle: %s", err)
499 }
500 }
501 return handle
502}
503
504var handleprelock sync.Mutex
505
506func prehandle(xid string) {
507 handleprelock.Lock()
508 defer handleprelock.Unlock()
509 handles(xid)
510}
511
512func prepend(s string, x []string) []string {
513 return append([]string{s}, x...)
514}
515
516// pleroma leaks followers addressed posts to followers
517func butnottooloud(aud []string) {
518 for i, a := range aud {
519 if strings.HasSuffix(a, "/followers") {
520 aud[i] = ""
521 }
522 }
523}
524
525func keepitquiet(aud []string) bool {
526 for _, a := range aud {
527 if a == thewholeworld {
528 return false
529 }
530 }
531 return true
532}
533
534func firstclass(honk *Honk) bool {
535 return honk.Audience[0] == thewholeworld
536}
537
538func oneofakind(a []string) []string {
539 seen := make(map[string]bool)
540 seen[""] = true
541 j := 0
542 for _, s := range a {
543 if !seen[s] {
544 seen[s] = true
545 a[j] = s
546 j++
547 }
548 }
549 return a[:j]
550}
551
552var ziggies = make(map[string]*rsa.PrivateKey)
553var zaggies = make(map[string]*rsa.PublicKey)
554var ziggylock sync.Mutex
555
556func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
557 ziggylock.Lock()
558 key = ziggies[username]
559 ziggylock.Unlock()
560 if key == nil {
561 db := opendatabase()
562 row := db.QueryRow("select seckey from users where username = ?", username)
563 var data string
564 row.Scan(&data)
565 var err error
566 key, _, err = httpsig.DecodeKey(data)
567 if err != nil {
568 log.Printf("error decoding %s seckey: %s", username, err)
569 return
570 }
571 ziggylock.Lock()
572 ziggies[username] = key
573 ziggylock.Unlock()
574 }
575 keyname = fmt.Sprintf("https://%s/%s/%s#key", serverName, userSep, username)
576 return
577}
578
579func zaggy(keyname string) (key *rsa.PublicKey) {
580 ziggylock.Lock()
581 key = zaggies[keyname]
582 ziggylock.Unlock()
583 if key != nil {
584 return
585 }
586 row := stmtGetXonker.QueryRow(keyname, "pubkey")
587 var data string
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
595 }
596 keyobj, ok := j.GetMap("publicKey")
597 if ok {
598 j = keyobj
599 }
600 data, ok = j.GetString("publicKeyPem")
601 if !ok {
602 log.Printf("error finding %s pubkey", keyname)
603 return
604 }
605 _, ok = j.GetString("owner")
606 if !ok {
607 log.Printf("error finding %s pubkey owner", keyname)
608 return
609 }
610 _, key, err = httpsig.DecodeKey(data)
611 if err != nil {
612 log.Printf("error decoding %s pubkey: %s", keyname, err)
613 return
614 }
615 _, err = stmtSaveXonker.Exec(keyname, data, "pubkey")
616 if err != nil {
617 log.Printf("error saving key: %s", err)
618 }
619 } else {
620 _, key, err = httpsig.DecodeKey(data)
621 if err != nil {
622 log.Printf("error decoding %s pubkey: %s", keyname, err)
623 return
624 }
625 }
626 ziggylock.Lock()
627 zaggies[keyname] = key
628 ziggylock.Unlock()
629 return
630}
631
632func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
633 _, err := stmtDeleteXonker.Exec(keyname, "pubkey")
634 if err != nil {
635 log.Printf("error deleting key: %s", err)
636 }
637 ziggylock.Lock()
638 delete(zaggies, keyname)
639 ziggylock.Unlock()
640 return httpsig.VerifyRequest(r, payload, zaggy)
641}
642
643func keymatch(keyname string, actor string) string {
644 hash := strings.IndexByte(keyname, '#')
645 if hash == -1 {
646 hash = len(keyname)
647 }
648 owner := keyname[0:hash]
649 if owner == actor {
650 return originate(actor)
651 }
652 return ""
653}