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("```((?s:.*?))```")
160var re_coder = regexp.MustCompile("`(.*?)`")
161
162func markitzero(s string) string {
163 s = re_bolder.ReplaceAllString(s, "$1<b>$2</b>$3")
164 s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
165 s = re_bigcoder.ReplaceAllString(s, "<pre><code>$1</code></pre>")
166 s = re_coder.ReplaceAllString(s, "<code>$1</code>")
167 return s
168}
169
170func obfusbreak(s string) string {
171 s = strings.TrimSpace(s)
172 s = strings.Replace(s, "\r", "", -1)
173 s = html.EscapeString(s)
174 // dammit go
175 s = strings.Replace(s, "'", "'", -1)
176 linkfn := func(url string) string {
177 if url[0] == '@' {
178 return url
179 }
180 addparen := false
181 adddot := false
182 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
183 url = url[:len(url)-1]
184 addparen = true
185 }
186 if strings.HasSuffix(url, ".") {
187 url = url[:len(url)-1]
188 adddot = true
189 }
190 url = fmt.Sprintf(`<a href="%s">%s</a>`, url, url)
191 if adddot {
192 url += "."
193 }
194 if addparen {
195 url += ")"
196 }
197 return url
198 }
199 s = re_link.ReplaceAllStringFunc(s, linkfn)
200
201 s = markitzero(s)
202
203 s = strings.Replace(s, "\n", "<br>", -1)
204 return s
205}
206
207func mentionize(s string) string {
208 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
209 where := gofish(m)
210 if where == "" {
211 return m
212 }
213 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
214 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
215 html.EscapeString(where), html.EscapeString(who))
216 })
217 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
218 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
219 html.EscapeString(m[1:]), html.EscapeString(m))
220 })
221 return s
222}
223
224var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
225
226func honkerhandle(h string) string {
227 m := re_unurl.FindStringSubmatch(h)
228 if len(m) > 2 {
229 return fmt.Sprintf("%s@%s", m[2], m[1])
230 }
231 return h
232}
233
234func prepend(s string, x []string) []string {
235 return append([]string{s}, x...)
236}
237
238// pleroma leaks followers addressed posts to followers
239func butnottooloud(aud []string) {
240 for i, a := range aud {
241 if strings.HasSuffix(a, "/followers") {
242 aud[i] = ""
243 }
244 }
245}
246
247func oneofakind(a []string) []string {
248 var x []string
249 for n, s := range a {
250 if s != "" {
251 x = append(x, s)
252 for i := n + 1; i < len(a); i++ {
253 if a[i] == s {
254 a[i] = ""
255 }
256 }
257 }
258 }
259 return x
260}
261
262var ziggies = make(map[string]*rsa.PrivateKey)
263var zaggies = make(map[string]*rsa.PublicKey)
264var ziggylock sync.Mutex
265
266func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
267 ziggylock.Lock()
268 key = ziggies[username]
269 ziggylock.Unlock()
270 if key == nil {
271 db := opendatabase()
272 row := db.QueryRow("select seckey from users where username = ?", username)
273 var data string
274 row.Scan(&data)
275 var err error
276 key, _, err = pez(data)
277 if err != nil {
278 log.Printf("error decoding %s seckey: %s", username, err)
279 return
280 }
281 ziggylock.Lock()
282 ziggies[username] = key
283 ziggylock.Unlock()
284 }
285 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
286 return
287}
288
289func zaggy(keyname string) (key *rsa.PublicKey) {
290 ziggylock.Lock()
291 key = zaggies[keyname]
292 ziggylock.Unlock()
293 if key != nil {
294 return
295 }
296 db := opendatabase()
297 row := db.QueryRow("select pubkey from xonkers where xid = ?", keyname)
298 var data string
299 err := row.Scan(&data)
300 if err != nil {
301 log.Printf("hitting the webs for missing pubkey: %s", keyname)
302 j, err := GetJunk(keyname)
303 if err != nil {
304 log.Printf("error getting %s pubkey: %s", keyname, err)
305 return
306 }
307 var ok bool
308 data, ok = jsonfindstring(j, []string{"publicKey", "publicKeyPem"})
309 if !ok {
310 log.Printf("error finding %s pubkey", keyname)
311 return
312 }
313 _, ok = jsonfindstring(j, []string{"publicKey", "owner"})
314 if !ok {
315 log.Printf("error finding %s pubkey owner", keyname)
316 return
317 }
318 _, key, err = pez(data)
319 if err != nil {
320 log.Printf("error decoding %s pubkey: %s", keyname, err)
321 return
322 }
323 _, err = stmtSaveBoxes.Exec(keyname, "", "", "", data)
324 if err != nil {
325 log.Printf("error saving key: %s", err)
326 }
327 } else {
328 _, key, err = pez(data)
329 if err != nil {
330 log.Printf("error decoding %s pubkey: %s", keyname, err)
331 return
332 }
333 }
334 ziggylock.Lock()
335 zaggies[keyname] = key
336 ziggylock.Unlock()
337 return
338}
339
340func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
341 db := opendatabase()
342 _, err := db.Exec("delete from xonkers where xid = ?", keyname)
343 if err != nil {
344 log.Printf("error deleting key: %s", err)
345 }
346 ziggylock.Lock()
347 delete(zaggies, keyname)
348 ziggylock.Unlock()
349 return zag(r, payload)
350}
351
352var thumbbiters map[int64]map[string]bool
353var thumblock sync.Mutex
354
355func bitethethumbs() {
356 rows, err := stmtThumbBiters.Query()
357 if err != nil {
358 log.Printf("error getting thumbbiters: %s", err)
359 return
360 }
361 defer rows.Close()
362 thumblock.Lock()
363 defer thumblock.Unlock()
364 thumbbiters = make(map[int64]map[string]bool)
365 for rows.Next() {
366 var userid int64
367 var name, wherefore string
368 err = rows.Scan(&userid, &name, &wherefore)
369 if err != nil {
370 log.Printf("error scanning zonker: %s", err)
371 continue
372 }
373 m := thumbbiters[userid]
374 if m == nil {
375 m = make(map[string]bool)
376 thumbbiters[userid] = m
377 }
378 m[name] = true
379 }
380}
381
382func thoudostbitethythumb(userid int64, who []string, objid string) bool {
383 thumblock.Lock()
384 biters := thumbbiters[userid]
385 thumblock.Unlock()
386 for _, w := range who {
387 if biters[w] {
388 return true
389 }
390 m := re_unurl.FindStringSubmatch(w)
391 if len(m) > 2 {
392 where := m[1]
393 if biters[where] {
394 return true
395 }
396 }
397 }
398 return false
399}
400
401func keymatch(keyname string, actor string, what string, userid int64) bool {
402 hash := strings.IndexByte(keyname, '#')
403 if hash == -1 {
404 hash = len(keyname)
405 }
406 owner := keyname[0:hash]
407 if owner == actor {
408 return true
409 }
410 if what != "Create" {
411 return false
412 }
413 row := stmtHasHonker.QueryRow(owner, userid)
414 var id int64
415 err := row.Scan(&id)
416 if err == nil {
417 log.Printf("allowing resigned content by %s", keyname)
418 return true
419 }
420 return false
421}