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 if strings.IndexByte(precis, ':') == -1 {
59 precis = "summary: " + precis
60 }
61 precis = "<p>" + precis + "<p>"
62 }
63 h.HTML, _ = filt.String(precis + h.Noise)
64 emuxifier := func(e string) string {
65 for _, d := range h.Donks {
66 if d.Name == e {
67 zap[d] = true
68 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
69 }
70 }
71 return e
72 }
73 h.HTML = template.HTML(re_emus.ReplaceAllStringFunc(string(h.HTML), emuxifier))
74 j := 0
75 for i := 0; i < len(h.Donks); i++ {
76 if !zap[h.Donks[i]] {
77 h.Donks[j] = h.Donks[i]
78 j++
79 }
80 }
81 h.Donks = h.Donks[:j]
82 }
83}
84
85func osmosis(honks []*Honk, userid int64) []*Honk {
86 zwords := getzwords(userid)
87 j := 0
88outer:
89 for _, h := range honks {
90 for _, z := range zwords {
91 if z.MatchString(h.Precis) || z.MatchString(h.Noise) {
92 continue outer
93 }
94 }
95 honks[j] = h
96 j++
97 }
98 return honks[0:j]
99}
100
101func shortxid(xid string) string {
102 idx := strings.LastIndexByte(xid, '/')
103 if idx == -1 {
104 return xid
105 }
106 return xid[idx+1:]
107}
108
109func xfiltrate() string {
110 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
111 for {
112 var b [18]byte
113 rand.Read(b[:])
114 for i, c := range b {
115 b[i] = letters[c&63]
116 }
117 s := string(b[:])
118 return s
119 }
120}
121
122type Mention struct {
123 who string
124 where string
125}
126
127var re_mentions = regexp.MustCompile(`@[[:alnum:]._-]+@[[:alnum:].-]+`)
128var re_urltions = regexp.MustCompile(`@https://\S+`)
129
130func grapevine(s string) []string {
131 var mentions []string
132 m := re_mentions.FindAllString(s, -1)
133 for i := range m {
134 where := gofish(m[i])
135 if where != "" {
136 mentions = append(mentions, where)
137 }
138 }
139 m = re_urltions.FindAllString(s, -1)
140 for i := range m {
141 mentions = append(mentions, m[i][1:])
142 }
143 return mentions
144}
145
146func bunchofgrapes(s string) []Mention {
147 m := re_mentions.FindAllString(s, -1)
148 var mentions []Mention
149 for i := range m {
150 where := gofish(m[i])
151 if where != "" {
152 mentions = append(mentions, Mention{who: m[i], where: where})
153 }
154 }
155 m = re_urltions.FindAllString(s, -1)
156 for i := range m {
157 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
158 }
159 return mentions
160}
161
162type Emu struct {
163 ID string
164 Name string
165}
166
167var re_link = regexp.MustCompile(`@?https?://[^\s"]+[\w/)]`)
168var re_emus = regexp.MustCompile(`:[[:alnum:]_]+:`)
169
170func herdofemus(noise string) []Emu {
171 m := re_emus.FindAllString(noise, -1)
172 m = oneofakind(m)
173 var emus []Emu
174 for _, e := range m {
175 fname := e[1 : len(e)-1]
176 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
177 emus = append(emus, Emu{ID: url, Name: e})
178 }
179 return emus
180}
181
182var re_memes = regexp.MustCompile("meme: ?([[:alnum:]_.-]+)")
183
184func memetics(noise string) []*Donk {
185 var donks []*Donk
186 m := re_memes.FindAllString(noise, -1)
187 for _, x := range m {
188 name := x[5:]
189 if name[0] == ' ' {
190 name = name[1:]
191 }
192 fd, err := os.Open("memes/" + name)
193 if err != nil {
194 log.Printf("no meme for %s", name)
195 continue
196 }
197 var peek [512]byte
198 n, _ := fd.Read(peek[:])
199 ct := http.DetectContentType(peek[:n])
200 fd.Close()
201
202 url := fmt.Sprintf("https://%s/meme/%s", serverName, name)
203 res, err := stmtSaveFile.Exec("", name, url, ct, 0, "")
204 if err != nil {
205 log.Printf("error saving meme: %s", err)
206 continue
207 }
208 var d Donk
209 d.FileID, _ = res.LastInsertId()
210 d.XID = ""
211 d.Name = name
212 d.Media = ct
213 d.URL = url
214 d.Local = false
215 donks = append(donks, &d)
216 }
217 return donks
218}
219
220var re_bolder = regexp.MustCompile(`(^|\W)\*\*([\w\s,.!?'-]+)\*\*($|\W)`)
221var re_italicer = regexp.MustCompile(`(^|\W)\*([\w\s,.!?'-]+)\*($|\W)`)
222var re_bigcoder = regexp.MustCompile("```\n?((?s:.*?))\n?```\n?")
223var re_coder = regexp.MustCompile("`([^`]*)`")
224var re_quoter = regexp.MustCompile(`(?m:^> (.*)\n?)`)
225
226func markitzero(s string) string {
227 var bigcodes []string
228 bigsaver := func(code string) string {
229 bigcodes = append(bigcodes, code)
230 return "``````"
231 }
232 s = re_bigcoder.ReplaceAllStringFunc(s, bigsaver)
233 var lilcodes []string
234 lilsaver := func(code string) string {
235 lilcodes = append(lilcodes, code)
236 return "`x`"
237 }
238 s = re_coder.ReplaceAllStringFunc(s, lilsaver)
239 s = re_bolder.ReplaceAllString(s, "$1<b>$2</b>$3")
240 s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
241 s = re_quoter.ReplaceAllString(s, "<blockquote>$1</blockquote><p>")
242 lilun := func(s string) string {
243 code := lilcodes[0]
244 lilcodes = lilcodes[1:]
245 return code
246 }
247 s = re_coder.ReplaceAllStringFunc(s, lilun)
248 bigun := func(s string) string {
249 code := bigcodes[0]
250 bigcodes = bigcodes[1:]
251 return code
252 }
253 s = re_bigcoder.ReplaceAllStringFunc(s, bigun)
254 s = re_bigcoder.ReplaceAllString(s, "<pre><code>$1</code></pre><p>")
255 s = re_coder.ReplaceAllString(s, "<code>$1</code>")
256 return s
257}
258
259func obfusbreak(s string) string {
260 s = strings.TrimSpace(s)
261 s = strings.Replace(s, "\r", "", -1)
262 s = html.EscapeString(s)
263 // dammit go
264 s = strings.Replace(s, "'", "'", -1)
265 linkfn := func(url string) string {
266 if url[0] == '@' {
267 return url
268 }
269 addparen := false
270 adddot := false
271 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
272 url = url[:len(url)-1]
273 addparen = true
274 }
275 if strings.HasSuffix(url, ".") {
276 url = url[:len(url)-1]
277 adddot = true
278 }
279 url = fmt.Sprintf(`<a href="%s">%s</a>`, url, url)
280 if adddot {
281 url += "."
282 }
283 if addparen {
284 url += ")"
285 }
286 return url
287 }
288 s = re_link.ReplaceAllStringFunc(s, linkfn)
289
290 s = markitzero(s)
291
292 s = strings.Replace(s, "\n", "<br>", -1)
293 return s
294}
295
296func mentionize(s string) string {
297 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
298 where := gofish(m)
299 if where == "" {
300 return m
301 }
302 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
303 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
304 html.EscapeString(where), html.EscapeString(who))
305 })
306 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
307 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
308 html.EscapeString(m[1:]), html.EscapeString(m))
309 })
310 return s
311}
312
313var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
314
315func originate(u string) string {
316 m := re_unurl.FindStringSubmatch(u)
317 if len(m) > 2 {
318 return m[1]
319 }
320 return ""
321}
322
323func honkerhandle(h string) (string, string) {
324 m := re_unurl.FindStringSubmatch(h)
325 if len(m) > 2 {
326 return m[2], fmt.Sprintf("%s@%s", m[2], m[1])
327 }
328 return "", h
329}
330
331func prepend(s string, x []string) []string {
332 return append([]string{s}, x...)
333}
334
335// pleroma leaks followers addressed posts to followers
336func butnottooloud(aud []string) {
337 for i, a := range aud {
338 if strings.HasSuffix(a, "/followers") {
339 aud[i] = ""
340 }
341 }
342}
343
344func keepitquiet(aud []string) bool {
345 for _, a := range aud {
346 if a == thewholeworld {
347 return false
348 }
349 }
350 return true
351}
352
353func oneofakind(a []string) []string {
354 var x []string
355 for n, s := range a {
356 if s != "" {
357 x = append(x, s)
358 for i := n + 1; i < len(a); i++ {
359 if a[i] == s {
360 a[i] = ""
361 }
362 }
363 }
364 }
365 return x
366}
367
368var ziggies = make(map[string]*rsa.PrivateKey)
369var zaggies = make(map[string]*rsa.PublicKey)
370var ziggylock sync.Mutex
371
372func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
373 ziggylock.Lock()
374 key = ziggies[username]
375 ziggylock.Unlock()
376 if key == nil {
377 db := opendatabase()
378 row := db.QueryRow("select seckey from users where username = ?", username)
379 var data string
380 row.Scan(&data)
381 var err error
382 key, _, err = pez(data)
383 if err != nil {
384 log.Printf("error decoding %s seckey: %s", username, err)
385 return
386 }
387 ziggylock.Lock()
388 ziggies[username] = key
389 ziggylock.Unlock()
390 }
391 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
392 return
393}
394
395func zaggy(keyname string) (key *rsa.PublicKey) {
396 ziggylock.Lock()
397 key = zaggies[keyname]
398 ziggylock.Unlock()
399 if key != nil {
400 return
401 }
402 row := stmtGetXonker.QueryRow(keyname, "pubkey")
403 var data string
404 err := row.Scan(&data)
405 if err != nil {
406 log.Printf("hitting the webs for missing pubkey: %s", keyname)
407 j, err := GetJunk(keyname)
408 if err != nil {
409 log.Printf("error getting %s pubkey: %s", keyname, err)
410 return
411 }
412 var ok bool
413 data, ok = jsonfindstring(j, []string{"publicKey", "publicKeyPem"})
414 if !ok {
415 log.Printf("error finding %s pubkey", keyname)
416 return
417 }
418 _, ok = jsonfindstring(j, []string{"publicKey", "owner"})
419 if !ok {
420 log.Printf("error finding %s pubkey owner", keyname)
421 return
422 }
423 _, key, err = pez(data)
424 if err != nil {
425 log.Printf("error decoding %s pubkey: %s", keyname, err)
426 return
427 }
428 _, err = stmtSaveXonker.Exec(keyname, data, "pubkey")
429 if err != nil {
430 log.Printf("error saving key: %s", err)
431 }
432 } else {
433 _, key, err = pez(data)
434 if err != nil {
435 log.Printf("error decoding %s pubkey: %s", keyname, err)
436 return
437 }
438 }
439 ziggylock.Lock()
440 zaggies[keyname] = key
441 ziggylock.Unlock()
442 return
443}
444
445func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
446 db := opendatabase()
447 _, err := db.Exec("delete from xonkers where xid = ?", keyname)
448 if err != nil {
449 log.Printf("error deleting key: %s", err)
450 }
451 ziggylock.Lock()
452 delete(zaggies, keyname)
453 ziggylock.Unlock()
454 return zag(r, payload)
455}
456
457var thumbbiters map[int64]map[string]bool
458var zwordses map[int64][]*regexp.Regexp
459var thumblock sync.Mutex
460
461func bitethethumbs() {
462 rows, err := stmtThumbBiters.Query()
463 if err != nil {
464 log.Printf("error getting thumbbiters: %s", err)
465 return
466 }
467 defer rows.Close()
468 thumblock.Lock()
469 defer thumblock.Unlock()
470 thumbbiters = make(map[int64]map[string]bool)
471 zwordses = make(map[int64][]*regexp.Regexp)
472 for rows.Next() {
473 var userid int64
474 var name, wherefore string
475 err = rows.Scan(&userid, &name, &wherefore)
476 if err != nil {
477 log.Printf("error scanning zonker: %s", err)
478 continue
479 }
480 if wherefore == "zword" {
481 zword := "\\b(?i:" + name + ")\\b"
482 re, err := regexp.Compile(zword)
483 if err != nil {
484 log.Printf("error compiling zword: %s", err)
485 } else {
486 zwordses[userid] = append(zwordses[userid], re)
487 }
488 continue
489 }
490 m := thumbbiters[userid]
491 if m == nil {
492 m = make(map[string]bool)
493 thumbbiters[userid] = m
494 }
495 m[name] = true
496 }
497}
498
499func getzwords(userid int64) []*regexp.Regexp {
500 thumblock.Lock()
501 defer thumblock.Unlock()
502 return zwordses[userid]
503}
504
505func thoudostbitethythumb(userid int64, who []string, objid string) bool {
506 thumblock.Lock()
507 biters := thumbbiters[userid]
508 thumblock.Unlock()
509 for _, w := range who {
510 if biters[w] {
511 return true
512 }
513 where := originate(w)
514 if where != "" {
515 if biters[where] {
516 return true
517 }
518 }
519 }
520 return false
521}
522
523func keymatch(keyname string, actor string) string {
524 hash := strings.IndexByte(keyname, '#')
525 if hash == -1 {
526 hash = len(keyname)
527 }
528 owner := keyname[0:hash]
529 if owner == actor {
530 return originate(actor)
531 }
532 return ""
533}