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