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)`)
159
160func markitzero(s string) string {
161 s = re_bolder.ReplaceAllString(s, "$1<b>$2</b>$3")
162 s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
163 return s
164}
165
166func obfusbreak(s string) string {
167 s = strings.TrimSpace(s)
168 s = strings.Replace(s, "\r", "", -1)
169 s = html.EscapeString(s)
170 // dammit go
171 s = strings.Replace(s, "'", "'", -1)
172 linkfn := func(url string) string {
173 if url[0] == '@' {
174 return url
175 }
176 addparen := false
177 adddot := false
178 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
179 url = url[:len(url)-1]
180 addparen = true
181 }
182 if strings.HasSuffix(url, ".") {
183 url = url[:len(url)-1]
184 adddot = true
185 }
186 url = fmt.Sprintf(`<a href="%s">%s</a>`, url, url)
187 if adddot {
188 url += "."
189 }
190 if addparen {
191 url += ")"
192 }
193 return url
194 }
195 s = re_link.ReplaceAllStringFunc(s, linkfn)
196
197 s = markitzero(s)
198
199 s = strings.Replace(s, "\n", "<br>", -1)
200 return s
201}
202
203func mentionize(s string) string {
204 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
205 where := gofish(m)
206 if where == "" {
207 return m
208 }
209 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
210 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
211 html.EscapeString(where), html.EscapeString(who))
212 })
213 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
214 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
215 html.EscapeString(m[1:]), html.EscapeString(m))
216 })
217 return s
218}
219
220var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
221
222func honkerhandle(h string) string {
223 m := re_unurl.FindStringSubmatch(h)
224 if len(m) > 2 {
225 return fmt.Sprintf("%s@%s", m[2], m[1])
226 }
227 return h
228}
229
230func prepend(s string, x []string) []string {
231 return append([]string{s}, x...)
232}
233
234func oneofakind(a []string) []string {
235 var x []string
236 for n, s := range a {
237 if s != "" {
238 x = append(x, s)
239 for i := n + 1; i < len(a); i++ {
240 if a[i] == s {
241 a[i] = ""
242 }
243 }
244 }
245 }
246 return x
247}
248
249var ziggies = make(map[string]*rsa.PrivateKey)
250var zaggies = make(map[string]*rsa.PublicKey)
251var ziggylock sync.Mutex
252
253func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
254 ziggylock.Lock()
255 key = ziggies[username]
256 ziggylock.Unlock()
257 if key == nil {
258 db := opendatabase()
259 row := db.QueryRow("select seckey from users where username = ?", username)
260 var data string
261 row.Scan(&data)
262 var err error
263 key, _, err = pez(data)
264 if err != nil {
265 log.Printf("error decoding %s seckey: %s", username, err)
266 return
267 }
268 ziggylock.Lock()
269 ziggies[username] = key
270 ziggylock.Unlock()
271 }
272 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
273 return
274}
275
276func zaggy(keyname string) (key *rsa.PublicKey) {
277 ziggylock.Lock()
278 key = zaggies[keyname]
279 ziggylock.Unlock()
280 if key != nil {
281 return
282 }
283 db := opendatabase()
284 row := db.QueryRow("select pubkey from xonkers where xid = ?", keyname)
285 var data string
286 err := row.Scan(&data)
287 if err != nil {
288 log.Printf("hitting the webs for missing pubkey: %s", keyname)
289 j, err := GetJunk(keyname)
290 if err != nil {
291 log.Printf("error getting %s pubkey: %s", keyname, err)
292 return
293 }
294 var ok bool
295 data, ok = jsonfindstring(j, []string{"publicKey", "publicKeyPem"})
296 if !ok {
297 log.Printf("error finding %s pubkey", keyname)
298 return
299 }
300 _, ok = jsonfindstring(j, []string{"publicKey", "owner"})
301 if !ok {
302 log.Printf("error finding %s pubkey owner", keyname)
303 return
304 }
305 _, key, err = pez(data)
306 if err != nil {
307 log.Printf("error decoding %s pubkey: %s", keyname, err)
308 return
309 }
310 db.Exec("insert into xonkers (xid, ibox, obox, sbox, pubkey) values (?, ?, ?, ?, ?)",
311 keyname, "", "", "", data)
312 } else {
313 _, key, err = pez(data)
314 if err != nil {
315 log.Printf("error decoding %s pubkey: %s", keyname, err)
316 return
317 }
318 }
319 ziggylock.Lock()
320 zaggies[keyname] = key
321 ziggylock.Unlock()
322 return
323}
324
325func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
326 db := opendatabase()
327 db.Exec("delete from xonkers where xid = ?", keyname)
328 ziggylock.Lock()
329 delete(zaggies, keyname)
330 ziggylock.Unlock()
331 return zag(r, payload)
332}
333
334var thumbbiters map[int64]map[string]bool
335var thumblock sync.Mutex
336
337func bitethethumbs() {
338 rows, err := stmtThumbBiters.Query()
339 if err != nil {
340 log.Printf("error getting thumbbiters: %s", err)
341 return
342 }
343 defer rows.Close()
344 thumblock.Lock()
345 defer thumblock.Unlock()
346 thumbbiters = make(map[int64]map[string]bool)
347 for rows.Next() {
348 var userid int64
349 var name, wherefore string
350 err = rows.Scan(&userid, &name, &wherefore)
351 if err != nil {
352 log.Printf("error scanning zonker: %s", err)
353 continue
354 }
355 m := thumbbiters[userid]
356 if m == nil {
357 m = make(map[string]bool)
358 thumbbiters[userid] = m
359 }
360 m[name] = true
361 }
362}
363
364func thoudostbitethythumb(userid int64, who []string, objid string) bool {
365 thumblock.Lock()
366 biters := thumbbiters[userid]
367 thumblock.Unlock()
368 for _, w := range who {
369 if biters[w] {
370 return true
371 }
372 m := re_unurl.FindStringSubmatch(w)
373 if len(m) > 2 {
374 where := m[1]
375 if biters[where] {
376 return true
377 }
378 }
379 }
380 return false
381}
382
383func keymatch(keyname string, actor string, userid int64) bool {
384 hash := strings.IndexByte(keyname, '#')
385 if hash == -1 {
386 hash = len(keyname)
387 }
388 owner := keyname[0:hash]
389 if owner == actor {
390 return true
391 }
392 row := stmtHasHonker.QueryRow(owner, userid)
393 var id int64
394 err := row.Scan(&id)
395 if err == nil {
396 log.Printf("allowing resigned content by %s", keyname)
397 return true
398 }
399 return false
400}