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)
35
36var allowedclasses = make(map[string]bool)
37
38func init() {
39 allowedclasses["kw"] = true
40 allowedclasses["bi"] = true
41 allowedclasses["st"] = true
42 allowedclasses["nm"] = true
43 allowedclasses["tp"] = true
44 allowedclasses["op"] = true
45 allowedclasses["cm"] = true
46 allowedclasses["al"] = true
47 allowedclasses["dl"] = true
48}
49
50func reverbolate(userid int64, honks []*Honk) {
51 filt := htfilter.New()
52 filt.Imager = replaceimg
53 filt.SpanClasses = allowedclasses
54 for _, h := range honks {
55 h.What += "ed"
56 if h.What == "tonked" {
57 h.What = "honked back"
58 h.Style = "subtle"
59 }
60 if !h.Public {
61 h.Style += " limited"
62 }
63 translate(h)
64 if h.Whofore == 2 || h.Whofore == 3 {
65 h.URL = h.XID
66 if h.What != "bonked" {
67 h.Noise = re_memes.ReplaceAllString(h.Noise, "")
68 h.Noise = mentionize(h.Noise)
69 h.Noise = ontologize(h.Noise)
70 }
71 h.Username, h.Handle = handles(h.Honker)
72 } else {
73 _, h.Handle = handles(h.Honker)
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 if h.URL == "" {
84 h.URL = h.XID
85 }
86 }
87 if h.Oonker != "" {
88 _, h.Oondle = handles(h.Oonker)
89 }
90 zap := make(map[*Donk]bool)
91 h.Precis = demoji(h.Precis)
92 h.Noise = demoji(h.Noise)
93 h.Open = "open"
94 if userid == -1 {
95 if h.Precis != "" {
96 h.Open = ""
97 }
98 } else {
99 unsee(userid, h)
100 if h.Open == "open" && h.Precis == "unspecified horror" {
101 h.Precis = ""
102 }
103 }
104 if len(h.Noise) > 6000 && h.Open == "open" {
105 if h.Precis == "" {
106 h.Precis = "really freaking long"
107 }
108 h.Open = ""
109 }
110
111 h.HTPrecis, _ = filt.String(h.Precis)
112 h.HTML, _ = filt.String(h.Noise)
113 emuxifier := func(e string) string {
114 for _, d := range h.Donks {
115 if d.Name == e {
116 zap[d] = true
117 if d.Local {
118 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
119 }
120 }
121 }
122 return e
123 }
124 h.HTPrecis = template.HTML(re_emus.ReplaceAllStringFunc(string(h.HTPrecis), emuxifier))
125 h.HTML = template.HTML(re_emus.ReplaceAllStringFunc(string(h.HTML), emuxifier))
126 j := 0
127 for i := 0; i < len(h.Donks); i++ {
128 if !zap[h.Donks[i]] {
129 h.Donks[j] = h.Donks[i]
130 j++
131 }
132 }
133 h.Donks = h.Donks[:j]
134 }
135}
136
137func replaceimg(node *html.Node) string {
138 src := htfilter.GetAttr(node, "src")
139 alt := htfilter.GetAttr(node, "alt")
140 //title := GetAttr(node, "title")
141 if htfilter.HasClass(node, "Emoji") && alt != "" {
142 return alt
143 }
144 alt = html.EscapeString(alt)
145 src = html.EscapeString(src)
146 d := finddonk(src)
147 if d != nil {
148 src = fmt.Sprintf("https://%s/d/%s", serverName, d.XID)
149 return fmt.Sprintf(`<img alt="%s" title="%s" src="%s">`, alt, alt, src)
150 }
151 return fmt.Sprintf(`<img alt="%s" src="<a href="%s">%s<a>">`, alt, src, src)
152}
153
154func inlineimgs(node *html.Node) string {
155 src := htfilter.GetAttr(node, "src")
156 alt := htfilter.GetAttr(node, "alt")
157 //title := GetAttr(node, "title")
158 if htfilter.HasClass(node, "Emoji") && alt != "" {
159 return alt
160 }
161 alt = html.EscapeString(alt)
162 src = html.EscapeString(src)
163 if !strings.HasPrefix(src, "https://"+serverName+"/") {
164 d := savedonk(src, "image", alt, "image", true)
165 if d != nil {
166 src = fmt.Sprintf("https://%s/d/%s", serverName, d.XID)
167 }
168 }
169 log.Printf("inline img with src: %s", src)
170 return fmt.Sprintf(`<img alt="%s" title="%s" src="%s>`, alt, alt, src)
171}
172
173func translate(honk *Honk) {
174 if honk.Format == "html" {
175 return
176 }
177 noise := honk.Noise
178 if strings.HasPrefix(noise, "DZ:") {
179 idx := strings.Index(noise, "\n")
180 if idx == -1 {
181 honk.Precis = noise
182 noise = ""
183 } else {
184 honk.Precis = noise[:idx]
185 noise = noise[idx+1:]
186 }
187 }
188 honk.Precis = strings.TrimSpace(honk.Precis)
189
190 noise = strings.TrimSpace(noise)
191 noise = quickrename(noise, honk.UserID)
192 noise = markitzero(noise)
193
194 honk.Noise = noise
195 honk.Onts = oneofakind(ontologies(honk.Noise))
196}
197
198func shortxid(xid string) string {
199 idx := strings.LastIndexByte(xid, '/')
200 if idx == -1 {
201 return xid
202 }
203 return xid[idx+1:]
204}
205
206func xfiltrate() string {
207 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
208 var b [18]byte
209 rand.Read(b[:])
210 for i, c := range b {
211 b[i] = letters[c&63]
212 }
213 s := string(b[:])
214 return s
215}
216
217var re_hashes = regexp.MustCompile(`(?:^| )#[[:alnum:]][[:alnum:]_-]*`)
218
219func ontologies(s string) []string {
220 m := re_hashes.FindAllString(s, -1)
221 j := 0
222 for _, h := range m {
223 if h[0] == '&' {
224 continue
225 }
226 if h[0] != '#' {
227 h = h[1:]
228 }
229 m[j] = h
230 j++
231 }
232 return m[:j]
233}
234
235type Mention struct {
236 who string
237 where string
238}
239
240var re_mentions = regexp.MustCompile(`@[[:alnum:]._-]+@[[:alnum:].-]*[[:alnum:]]`)
241var re_urltions = regexp.MustCompile(`@https://\S+`)
242
243func grapevine(s string) []string {
244 var mentions []string
245 m := re_mentions.FindAllString(s, -1)
246 for i := range m {
247 where := gofish(m[i])
248 if where != "" {
249 mentions = append(mentions, where)
250 }
251 }
252 m = re_urltions.FindAllString(s, -1)
253 for i := range m {
254 mentions = append(mentions, m[i][1:])
255 }
256 return mentions
257}
258
259func bunchofgrapes(s string) []Mention {
260 m := re_mentions.FindAllString(s, -1)
261 var mentions []Mention
262 for i := range m {
263 where := gofish(m[i])
264 if where != "" {
265 mentions = append(mentions, Mention{who: m[i], where: where})
266 }
267 }
268 m = re_urltions.FindAllString(s, -1)
269 for i := range m {
270 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
271 }
272 return mentions
273}
274
275type Emu struct {
276 ID string
277 Name string
278}
279
280var re_emus = regexp.MustCompile(`:[[:alnum:]_-]+:`)
281
282func herdofemus(noise string) []Emu {
283 m := re_emus.FindAllString(noise, -1)
284 m = oneofakind(m)
285 var emus []Emu
286 for _, e := range m {
287 fname := e[1 : len(e)-1]
288 _, err := os.Stat("emus/" + fname + ".png")
289 if err != nil {
290 continue
291 }
292 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
293 emus = append(emus, Emu{ID: url, Name: e})
294 }
295 return emus
296}
297
298var re_memes = regexp.MustCompile("meme: ?([[:alnum:]_.-]+)")
299
300func memetize(honk *Honk) {
301 repl := func(x string) string {
302 name := x[5:]
303 if name[0] == ' ' {
304 name = name[1:]
305 }
306 fd, err := os.Open("memes/" + name)
307 if err != nil {
308 log.Printf("no meme for %s", name)
309 return x
310 }
311 var peek [512]byte
312 n, _ := fd.Read(peek[:])
313 ct := http.DetectContentType(peek[:n])
314 fd.Close()
315
316 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
317 fileid, err := savefile("", name, name, url, ct, false, nil)
318 if err != nil {
319 log.Printf("error saving meme: %s", err)
320 return x
321 }
322 var d Donk
323 d.FileID = fileid
324 d.XID = ""
325 d.Name = name
326 d.Media = ct
327 d.URL = url
328 d.Local = false
329 honk.Donks = append(honk.Donks, &d)
330 return ""
331 }
332 honk.Noise = re_memes.ReplaceAllStringFunc(honk.Noise, repl)
333}
334
335var re_quickmention = regexp.MustCompile("(^| )@[[:alnum:]]+( |$)")
336
337func quickrename(s string, userid int64) string {
338 nonstop := true
339 for nonstop {
340 nonstop = false
341 s = re_quickmention.ReplaceAllStringFunc(s, func(m string) string {
342 prefix := ""
343 if m[0] == ' ' {
344 prefix = " "
345 m = m[1:]
346 }
347 prefix += "@"
348 m = m[1:]
349 if m[len(m)-1] == ' ' {
350 m = m[:len(m)-1]
351 }
352
353 row := stmtOneHonker.QueryRow(m, userid)
354 var xid string
355 err := row.Scan(&xid)
356 if err == nil {
357 _, name := handles(xid)
358 if name != "" {
359 nonstop = true
360 m = name
361 }
362 }
363 return prefix + m + " "
364 })
365 }
366 return s
367}
368
369var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
370 honkers := gethonkers(userid)
371 m := make(map[string]string)
372 for _, h := range honkers {
373 m[h.XID] = h.Name
374 }
375 return m, true
376}})
377
378func shortname(userid int64, xid string) string {
379 var m map[string]string
380 ok := shortnames.Get(userid, &m)
381 if ok {
382 return m[xid]
383 }
384 return ""
385}
386
387func mentionize(s string) string {
388 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
389 where := gofish(m)
390 if where == "" {
391 return m
392 }
393 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
394 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
395 html.EscapeString(where), html.EscapeString(who))
396 })
397 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
398 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
399 html.EscapeString(m[1:]), html.EscapeString(m))
400 })
401 return s
402}
403
404func ontologize(s string) string {
405 s = re_hashes.ReplaceAllStringFunc(s, func(o string) string {
406 if o[0] == '&' {
407 return o
408 }
409 p := ""
410 h := o
411 if h[0] != '#' {
412 p = h[:1]
413 h = h[1:]
414 }
415 return fmt.Sprintf(`%s<a class="mention u-url" href="https://%s/o/%s">%s</a>`, p, serverName,
416 strings.ToLower(h[1:]), h)
417 })
418 return s
419}
420
421var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
422var re_urlhost = regexp.MustCompile("https://([^/ ]+)")
423
424func originate(u string) string {
425 m := re_urlhost.FindStringSubmatch(u)
426 if len(m) > 1 {
427 return m[1]
428 }
429 return ""
430}
431
432var allhandles = make(map[string]string)
433var handlelock sync.Mutex
434
435// handle, handle@host
436func handles(xid string) (string, string) {
437 if xid == "" {
438 return "", ""
439 }
440 handlelock.Lock()
441 handle := allhandles[xid]
442 handlelock.Unlock()
443 if handle == "" {
444 handle = findhandle(xid)
445 handlelock.Lock()
446 allhandles[xid] = handle
447 handlelock.Unlock()
448 }
449 if handle == xid {
450 return xid, xid
451 }
452 return handle, handle + "@" + originate(xid)
453}
454
455func findhandle(xid string) string {
456 row := stmtGetXonker.QueryRow(xid, "handle")
457 var handle string
458 err := row.Scan(&handle)
459 if err != nil {
460 p, _ := investigate(xid)
461 if p == nil {
462 m := re_unurl.FindStringSubmatch(xid)
463 if len(m) > 2 {
464 handle = m[2]
465 } else {
466 handle = xid
467 }
468 } else {
469 handle = p.Handle
470 }
471 _, err = stmtSaveXonker.Exec(xid, handle, "handle")
472 if err != nil {
473 log.Printf("error saving handle: %s", err)
474 }
475 }
476 return handle
477}
478
479var handleprelock sync.Mutex
480
481func prehandle(xid string) {
482 handleprelock.Lock()
483 defer handleprelock.Unlock()
484 handles(xid)
485}
486
487func prepend(s string, x []string) []string {
488 return append([]string{s}, x...)
489}
490
491// pleroma leaks followers addressed posts to followers
492func butnottooloud(aud []string) {
493 for i, a := range aud {
494 if strings.HasSuffix(a, "/followers") {
495 aud[i] = ""
496 }
497 }
498}
499
500func keepitquiet(aud []string) bool {
501 for _, a := range aud {
502 if a == thewholeworld {
503 return false
504 }
505 }
506 return true
507}
508
509func firstclass(honk *Honk) bool {
510 return honk.Audience[0] == thewholeworld
511}
512
513func oneofakind(a []string) []string {
514 var x []string
515 for n, s := range a {
516 if s != "" {
517 x = append(x, s)
518 for i := n + 1; i < len(a); i++ {
519 if a[i] == s {
520 a[i] = ""
521 }
522 }
523 }
524 }
525 return x
526}
527
528var ziggies = make(map[string]*rsa.PrivateKey)
529var zaggies = make(map[string]*rsa.PublicKey)
530var ziggylock sync.Mutex
531
532func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
533 ziggylock.Lock()
534 key = ziggies[username]
535 ziggylock.Unlock()
536 if key == nil {
537 db := opendatabase()
538 row := db.QueryRow("select seckey from users where username = ?", username)
539 var data string
540 row.Scan(&data)
541 var err error
542 key, _, err = httpsig.DecodeKey(data)
543 if err != nil {
544 log.Printf("error decoding %s seckey: %s", username, err)
545 return
546 }
547 ziggylock.Lock()
548 ziggies[username] = key
549 ziggylock.Unlock()
550 }
551 keyname = fmt.Sprintf("https://%s/%s/%s#key", serverName, userSep, username)
552 return
553}
554
555func zaggy(keyname string) (key *rsa.PublicKey) {
556 ziggylock.Lock()
557 key = zaggies[keyname]
558 ziggylock.Unlock()
559 if key != nil {
560 return
561 }
562 row := stmtGetXonker.QueryRow(keyname, "pubkey")
563 var data string
564 err := row.Scan(&data)
565 if err != nil {
566 log.Printf("hitting the webs for missing pubkey: %s", keyname)
567 j, err := GetJunk(keyname)
568 if err != nil {
569 log.Printf("error getting %s pubkey: %s", keyname, err)
570 return
571 }
572 keyobj, ok := j.GetMap("publicKey")
573 if ok {
574 j = keyobj
575 }
576 data, ok = j.GetString("publicKeyPem")
577 if !ok {
578 log.Printf("error finding %s pubkey", keyname)
579 return
580 }
581 _, ok = j.GetString("owner")
582 if !ok {
583 log.Printf("error finding %s pubkey owner", keyname)
584 return
585 }
586 _, key, err = httpsig.DecodeKey(data)
587 if err != nil {
588 log.Printf("error decoding %s pubkey: %s", keyname, err)
589 return
590 }
591 _, err = stmtSaveXonker.Exec(keyname, data, "pubkey")
592 if err != nil {
593 log.Printf("error saving key: %s", err)
594 }
595 } else {
596 _, key, err = httpsig.DecodeKey(data)
597 if err != nil {
598 log.Printf("error decoding %s pubkey: %s", keyname, err)
599 return
600 }
601 }
602 ziggylock.Lock()
603 zaggies[keyname] = key
604 ziggylock.Unlock()
605 return
606}
607
608func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
609 _, err := stmtDeleteXonker.Exec(keyname, "pubkey")
610 if err != nil {
611 log.Printf("error deleting key: %s", err)
612 }
613 ziggylock.Lock()
614 delete(zaggies, keyname)
615 ziggylock.Unlock()
616 return httpsig.VerifyRequest(r, payload, zaggy)
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}