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