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