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"
23 "html/template"
24 "log"
25 "net/http"
26 "os"
27 "regexp"
28 "strings"
29 "sync"
30
31 "humungus.tedunangst.com/r/webs/htfilter"
32)
33
34func reverbolate(honks []*Honk) {
35 filt := htfilter.New()
36 for _, h := range honks {
37 h.What += "ed"
38 if h.Whofore == 2 || h.Whofore == 3 {
39 h.URL = h.XID
40 h.Noise = mentionize(h.Noise)
41 h.Username, h.Handle = honkerhandle(h.Honker)
42 } else {
43 idx := strings.LastIndexByte(h.Honker, '/')
44 if idx != -1 {
45 h.Username, h.Handle = honkerhandle(h.Honker)
46 } else {
47 h.Username = h.Honker
48 h.Handle = h.Honker
49 }
50 if h.URL == "" {
51 h.URL = h.XID
52 }
53 }
54 zap := make(map[*Donk]bool)
55 h.Noise = unpucker(h.Noise)
56 precis := h.Precis
57 if precis != "" {
58 precis = "<p>summary: " + precis + "<p>"
59 }
60 h.HTML, _ = filt.String(precis + h.Noise)
61 emuxifier := func(e string) string {
62 for _, d := range h.Donks {
63 if d.Name == e {
64 zap[d] = true
65 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
66 }
67 }
68 return e
69 }
70 h.HTML = template.HTML(re_emus.ReplaceAllStringFunc(string(h.HTML), emuxifier))
71 j := 0
72 for i := 0; i < len(h.Donks); i++ {
73 if !zap[h.Donks[i]] {
74 h.Donks[j] = h.Donks[i]
75 j++
76 }
77 }
78 h.Donks = h.Donks[:j]
79 }
80}
81
82func osmosis(honks []*Honk, userid int64) []*Honk {
83 zwords := getzwords(userid)
84 j := 0
85outer:
86 for _, h := range honks {
87 for _, z := range zwords {
88 if z.MatchString(h.Precis) || z.MatchString(h.Noise) {
89 continue outer
90 }
91 }
92 honks[j] = h
93 j++
94 }
95 return honks[0:j]
96}
97
98func shortxid(xid string) string {
99 idx := strings.LastIndexByte(xid, '/')
100 if idx == -1 {
101 return xid
102 }
103 return xid[idx+1:]
104}
105
106func xfiltrate() string {
107 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
108 for {
109 var b [18]byte
110 rand.Read(b[:])
111 for i, c := range b {
112 b[i] = letters[c&63]
113 }
114 s := string(b[:])
115 return s
116 }
117}
118
119type Mention struct {
120 who string
121 where string
122}
123
124var re_mentions = regexp.MustCompile(`@[[:alnum:]._-]+@[[:alnum:].-]+`)
125var re_urltions = regexp.MustCompile(`@https://\S+`)
126
127func grapevine(s string) []string {
128 var mentions []string
129 m := re_mentions.FindAllString(s, -1)
130 for i := range m {
131 where := gofish(m[i])
132 if where != "" {
133 mentions = append(mentions, where)
134 }
135 }
136 m = re_urltions.FindAllString(s, -1)
137 for i := range m {
138 mentions = append(mentions, m[i][1:])
139 }
140 return mentions
141}
142
143func bunchofgrapes(s string) []Mention {
144 m := re_mentions.FindAllString(s, -1)
145 var mentions []Mention
146 for i := range m {
147 where := gofish(m[i])
148 if where != "" {
149 mentions = append(mentions, Mention{who: m[i], where: where})
150 }
151 }
152 m = re_urltions.FindAllString(s, -1)
153 for i := range m {
154 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
155 }
156 return mentions
157}
158
159type Emu struct {
160 ID string
161 Name string
162}
163
164var re_link = regexp.MustCompile(`@?https?://[^\s"]+[\w/)]`)
165var re_emus = regexp.MustCompile(`:[[:alnum:]_]+:`)
166
167func herdofemus(noise string) []Emu {
168 m := re_emus.FindAllString(noise, -1)
169 m = oneofakind(m)
170 var emus []Emu
171 for _, e := range m {
172 fname := e[1 : len(e)-1]
173 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
174 emus = append(emus, Emu{ID: url, Name: e})
175 }
176 return emus
177}
178
179var re_memes = regexp.MustCompile("meme: ?([[:alnum:]_.-]+)")
180
181func memetics(noise string) []*Donk {
182 var donks []*Donk
183 m := re_memes.FindAllString(noise, -1)
184 for _, x := range m {
185 name := x[5:]
186 if name[0] == ' ' {
187 name = name[1:]
188 }
189 fd, err := os.Open("memes/" + name)
190 if err != nil {
191 log.Printf("no meme for %s", name)
192 continue
193 }
194 var peek [512]byte
195 n, _ := fd.Read(peek[:])
196 ct := http.DetectContentType(peek[:n])
197 fd.Close()
198
199 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
200 res, err := stmtSaveFile.Exec("", name, url, ct, 0, "")
201 if err != nil {
202 log.Printf("error saving meme: %s", err)
203 continue
204 }
205 var d Donk
206 d.FileID, _ = res.LastInsertId()
207 d.XID = ""
208 d.Name = name
209 d.Media = ct
210 d.URL = url
211 d.Local = false
212 donks = append(donks, &d)
213 }
214 return donks
215}
216
217var re_bolder = regexp.MustCompile(`(^|\W)\*\*([\w\s,.!?'-]+)\*\*($|\W)`)
218var re_italicer = regexp.MustCompile(`(^|\W)\*([\w\s,.!?'-]+)\*($|\W)`)
219var re_bigcoder = regexp.MustCompile("```\n?((?s:.*?))\n?```\n?")
220var re_coder = regexp.MustCompile("`([^`]*)`")
221var re_quoter = regexp.MustCompile(`(?m:^> (.*)\n?)`)
222
223func markitzero(s string) string {
224 var bigcodes []string
225 bigsaver := func(code string) string {
226 bigcodes = append(bigcodes, code)
227 return "``````"
228 }
229 s = re_bigcoder.ReplaceAllStringFunc(s, bigsaver)
230 var lilcodes []string
231 lilsaver := func(code string) string {
232 lilcodes = append(lilcodes, code)
233 return "`x`"
234 }
235 s = re_coder.ReplaceAllStringFunc(s, lilsaver)
236 s = re_bolder.ReplaceAllString(s, "$1<b>$2</b>$3")
237 s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
238 s = re_quoter.ReplaceAllString(s, "<blockquote>$1</blockquote><p>")
239 lilun := func(s string) string {
240 code := lilcodes[0]
241 lilcodes = lilcodes[1:]
242 return code
243 }
244 s = re_coder.ReplaceAllStringFunc(s, lilun)
245 bigun := func(s string) string {
246 code := bigcodes[0]
247 bigcodes = bigcodes[1:]
248 return code
249 }
250 s = re_bigcoder.ReplaceAllStringFunc(s, bigun)
251 s = re_bigcoder.ReplaceAllString(s, "<pre><code>$1</code></pre><p>")
252 s = re_coder.ReplaceAllString(s, "<code>$1</code>")
253 return s
254}
255
256func obfusbreak(s string) string {
257 s = strings.TrimSpace(s)
258 s = strings.Replace(s, "\r", "", -1)
259 s = html.EscapeString(s)
260 // dammit go
261 s = strings.Replace(s, "'", "'", -1)
262 linkfn := func(url string) string {
263 if url[0] == '@' {
264 return url
265 }
266 addparen := false
267 adddot := false
268 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
269 url = url[:len(url)-1]
270 addparen = true
271 }
272 if strings.HasSuffix(url, ".") {
273 url = url[:len(url)-1]
274 adddot = true
275 }
276 url = fmt.Sprintf(`<a href="%s">%s</a>`, url, url)
277 if adddot {
278 url += "."
279 }
280 if addparen {
281 url += ")"
282 }
283 return url
284 }
285 s = re_link.ReplaceAllStringFunc(s, linkfn)
286
287 s = markitzero(s)
288
289 s = strings.Replace(s, "\n", "<br>", -1)
290 return s
291}
292
293func mentionize(s string) string {
294 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
295 where := gofish(m)
296 if where == "" {
297 return m
298 }
299 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
300 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
301 html.EscapeString(where), html.EscapeString(who))
302 })
303 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
304 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
305 html.EscapeString(m[1:]), html.EscapeString(m))
306 })
307 return s
308}
309
310var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
311
312func originate(u string) string {
313 m := re_unurl.FindStringSubmatch(u)
314 if len(m) > 2 {
315 return m[1]
316 }
317 return ""
318}
319
320func honkerhandle(h string) (string, string) {
321 m := re_unurl.FindStringSubmatch(h)
322 if len(m) > 2 {
323 return m[2], fmt.Sprintf("%s@%s", m[2], m[1])
324 }
325 return "", h
326}
327
328func prepend(s string, x []string) []string {
329 return append([]string{s}, x...)
330}
331
332// pleroma leaks followers addressed posts to followers
333func butnottooloud(aud []string) {
334 for i, a := range aud {
335 if strings.HasSuffix(a, "/followers") {
336 aud[i] = ""
337 }
338 }
339}
340
341func keepitquiet(aud []string) bool {
342 for _, a := range aud {
343 if a == thewholeworld {
344 return false
345 }
346 }
347 return true
348}
349
350func oneofakind(a []string) []string {
351 var x []string
352 for n, s := range a {
353 if s != "" {
354 x = append(x, s)
355 for i := n + 1; i < len(a); i++ {
356 if a[i] == s {
357 a[i] = ""
358 }
359 }
360 }
361 }
362 return x
363}
364
365var ziggies = make(map[string]*rsa.PrivateKey)
366var zaggies = make(map[string]*rsa.PublicKey)
367var ziggylock sync.Mutex
368
369func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
370 ziggylock.Lock()
371 key = ziggies[username]
372 ziggylock.Unlock()
373 if key == nil {
374 db := opendatabase()
375 row := db.QueryRow("select seckey from users where username = ?", username)
376 var data string
377 row.Scan(&data)
378 var err error
379 key, _, err = pez(data)
380 if err != nil {
381 log.Printf("error decoding %s seckey: %s", username, err)
382 return
383 }
384 ziggylock.Lock()
385 ziggies[username] = key
386 ziggylock.Unlock()
387 }
388 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
389 return
390}
391
392func zaggy(keyname string) (key *rsa.PublicKey) {
393 ziggylock.Lock()
394 key = zaggies[keyname]
395 ziggylock.Unlock()
396 if key != nil {
397 return
398 }
399 row := stmtGetXonker.QueryRow(keyname, "pubkey")
400 var data string
401 err := row.Scan(&data)
402 if err != nil {
403 log.Printf("hitting the webs for missing pubkey: %s", keyname)
404 j, err := GetJunk(keyname)
405 if err != nil {
406 log.Printf("error getting %s pubkey: %s", keyname, err)
407 return
408 }
409 var ok bool
410 data, ok = jsonfindstring(j, []string{"publicKey", "publicKeyPem"})
411 if !ok {
412 log.Printf("error finding %s pubkey", keyname)
413 return
414 }
415 _, ok = jsonfindstring(j, []string{"publicKey", "owner"})
416 if !ok {
417 log.Printf("error finding %s pubkey owner", keyname)
418 return
419 }
420 _, key, err = pez(data)
421 if err != nil {
422 log.Printf("error decoding %s pubkey: %s", keyname, err)
423 return
424 }
425 _, err = stmtSaveXonker.Exec(keyname, data, "pubkey")
426 if err != nil {
427 log.Printf("error saving key: %s", err)
428 }
429 } else {
430 _, key, err = pez(data)
431 if err != nil {
432 log.Printf("error decoding %s pubkey: %s", keyname, err)
433 return
434 }
435 }
436 ziggylock.Lock()
437 zaggies[keyname] = key
438 ziggylock.Unlock()
439 return
440}
441
442func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
443 db := opendatabase()
444 _, err := db.Exec("delete from xonkers where xid = ?", keyname)
445 if err != nil {
446 log.Printf("error deleting key: %s", err)
447 }
448 ziggylock.Lock()
449 delete(zaggies, keyname)
450 ziggylock.Unlock()
451 return zag(r, payload)
452}
453
454var thumbbiters map[int64]map[string]bool
455var zwordses map[int64][]*regexp.Regexp
456var thumblock sync.Mutex
457
458func bitethethumbs() {
459 rows, err := stmtThumbBiters.Query()
460 if err != nil {
461 log.Printf("error getting thumbbiters: %s", err)
462 return
463 }
464 defer rows.Close()
465 thumblock.Lock()
466 defer thumblock.Unlock()
467 thumbbiters = make(map[int64]map[string]bool)
468 zwordses = make(map[int64][]*regexp.Regexp)
469 for rows.Next() {
470 var userid int64
471 var name, wherefore string
472 err = rows.Scan(&userid, &name, &wherefore)
473 if err != nil {
474 log.Printf("error scanning zonker: %s", err)
475 continue
476 }
477 if wherefore == "zword" {
478 zword := "\\b(?i:" + name + ")\\b"
479 re, err := regexp.Compile(zword)
480 if err != nil {
481 log.Printf("error compiling zword: %s", err)
482 } else {
483 zwordses[userid] = append(zwordses[userid], re)
484 }
485 continue
486 }
487 m := thumbbiters[userid]
488 if m == nil {
489 m = make(map[string]bool)
490 thumbbiters[userid] = m
491 }
492 m[name] = true
493 }
494}
495
496func getzwords(userid int64) []*regexp.Regexp {
497 thumblock.Lock()
498 defer thumblock.Unlock()
499 return zwordses[userid]
500}
501
502func thoudostbitethythumb(userid int64, who []string, objid string) bool {
503 thumblock.Lock()
504 biters := thumbbiters[userid]
505 thumblock.Unlock()
506 for _, w := range who {
507 if biters[w] {
508 return true
509 }
510 where := originate(w)
511 if where != "" {
512 if biters[where] {
513 return true
514 }
515 }
516 }
517 return false
518}
519
520func keymatch(keyname string, actor string) string {
521 hash := strings.IndexByte(keyname, '#')
522 if hash == -1 {
523 hash = len(keyname)
524 }
525 owner := keyname[0:hash]
526 if owner == actor {
527 return originate(actor)
528 }
529 return ""
530}