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