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 {
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 shortxid(xid string) string {
80 idx := strings.LastIndexByte(xid, '/')
81 if idx == -1 {
82 return xid
83 }
84 return xid[idx+1:]
85}
86
87func xfiltrate() string {
88 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
89 for {
90 var b [18]byte
91 rand.Read(b[:])
92 for i, c := range b {
93 b[i] = letters[c&63]
94 }
95 s := string(b[:])
96 return s
97 }
98}
99
100type Mention struct {
101 who string
102 where string
103}
104
105var re_mentions = regexp.MustCompile(`@[[:alnum:]._-]+@[[:alnum:].-]+`)
106var re_urltions = regexp.MustCompile(`@https://\S+`)
107
108func grapevine(s string) []string {
109 var mentions []string
110 m := re_mentions.FindAllString(s, -1)
111 for i := range m {
112 where := gofish(m[i])
113 if where != "" {
114 mentions = append(mentions, where)
115 }
116 }
117 m = re_urltions.FindAllString(s, -1)
118 for i := range m {
119 mentions = append(mentions, m[i][1:])
120 }
121 return mentions
122}
123
124func bunchofgrapes(s string) []Mention {
125 m := re_mentions.FindAllString(s, -1)
126 var mentions []Mention
127 for i := range m {
128 where := gofish(m[i])
129 if where != "" {
130 mentions = append(mentions, Mention{who: m[i], where: where})
131 }
132 }
133 m = re_urltions.FindAllString(s, -1)
134 for i := range m {
135 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
136 }
137 return mentions
138}
139
140type Emu struct {
141 ID string
142 Name string
143}
144
145var re_link = regexp.MustCompile(`@?https?://[^\s"]+[\w/)]`)
146var re_emus = regexp.MustCompile(`:[[:alnum:]_]+:`)
147
148func herdofemus(noise string) []Emu {
149 m := re_emus.FindAllString(noise, -1)
150 m = oneofakind(m)
151 var emus []Emu
152 for _, e := range m {
153 fname := e[1 : len(e)-1]
154 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
155 emus = append(emus, Emu{ID: url, Name: e})
156 }
157 return emus
158}
159
160var re_bolder = regexp.MustCompile(`(^|\W)\*\*([\w\s,.!?'-]+)\*\*($|\W)`)
161var re_italicer = regexp.MustCompile(`(^|\W)\*([\w\s,.!?'-]+)\*($|\W)`)
162var re_bigcoder = regexp.MustCompile("```\n?((?s:.*?))\n?```")
163var re_coder = regexp.MustCompile("`([^`]*)`")
164
165func markitzero(s string) string {
166 var bigcodes []string
167 bigsaver := func(code string) string {
168 bigcodes = append(bigcodes, code)
169 return "``````"
170 }
171 s = re_bigcoder.ReplaceAllStringFunc(s, bigsaver)
172 var lilcodes []string
173 lilsaver := func(code string) string {
174 lilcodes = append(lilcodes, code)
175 return "`x`"
176 }
177 s = re_coder.ReplaceAllStringFunc(s, lilsaver)
178 s = re_bolder.ReplaceAllString(s, "$1<b>$2</b>$3")
179 s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
180 lilun := func(s string) string {
181 code := lilcodes[0]
182 lilcodes = lilcodes[1:]
183 return code
184 }
185 s = re_coder.ReplaceAllStringFunc(s, lilun)
186 bigun := func(s string) string {
187 code := bigcodes[0]
188 bigcodes = bigcodes[1:]
189 return code
190 }
191 s = re_bigcoder.ReplaceAllStringFunc(s, bigun)
192 s = re_bigcoder.ReplaceAllString(s, "<pre><code>$1</code></pre>")
193 s = re_coder.ReplaceAllString(s, "<code>$1</code>")
194 return s
195}
196
197func obfusbreak(s string) string {
198 s = strings.TrimSpace(s)
199 s = strings.Replace(s, "\r", "", -1)
200 s = html.EscapeString(s)
201 // dammit go
202 s = strings.Replace(s, "'", "'", -1)
203 linkfn := func(url string) string {
204 if url[0] == '@' {
205 return url
206 }
207 addparen := false
208 adddot := false
209 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
210 url = url[:len(url)-1]
211 addparen = true
212 }
213 if strings.HasSuffix(url, ".") {
214 url = url[:len(url)-1]
215 adddot = true
216 }
217 url = fmt.Sprintf(`<a href="%s">%s</a>`, url, url)
218 if adddot {
219 url += "."
220 }
221 if addparen {
222 url += ")"
223 }
224 return url
225 }
226 s = re_link.ReplaceAllStringFunc(s, linkfn)
227
228 s = markitzero(s)
229
230 s = strings.Replace(s, "\n", "<br>", -1)
231 return s
232}
233
234func mentionize(s string) string {
235 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
236 where := gofish(m)
237 if where == "" {
238 return m
239 }
240 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
241 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
242 html.EscapeString(where), html.EscapeString(who))
243 })
244 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
245 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
246 html.EscapeString(m[1:]), html.EscapeString(m))
247 })
248 return s
249}
250
251var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
252
253func honkerhandle(h string) string {
254 m := re_unurl.FindStringSubmatch(h)
255 if len(m) > 2 {
256 return fmt.Sprintf("%s@%s", m[2], m[1])
257 }
258 return h
259}
260
261func prepend(s string, x []string) []string {
262 return append([]string{s}, x...)
263}
264
265// pleroma leaks followers addressed posts to followers
266func butnottooloud(aud []string) {
267 for i, a := range aud {
268 if strings.HasSuffix(a, "/followers") {
269 aud[i] = ""
270 }
271 }
272}
273
274func oneofakind(a []string) []string {
275 var x []string
276 for n, s := range a {
277 if s != "" {
278 x = append(x, s)
279 for i := n + 1; i < len(a); i++ {
280 if a[i] == s {
281 a[i] = ""
282 }
283 }
284 }
285 }
286 return x
287}
288
289var ziggies = make(map[string]*rsa.PrivateKey)
290var zaggies = make(map[string]*rsa.PublicKey)
291var ziggylock sync.Mutex
292
293func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
294 ziggylock.Lock()
295 key = ziggies[username]
296 ziggylock.Unlock()
297 if key == nil {
298 db := opendatabase()
299 row := db.QueryRow("select seckey from users where username = ?", username)
300 var data string
301 row.Scan(&data)
302 var err error
303 key, _, err = pez(data)
304 if err != nil {
305 log.Printf("error decoding %s seckey: %s", username, err)
306 return
307 }
308 ziggylock.Lock()
309 ziggies[username] = key
310 ziggylock.Unlock()
311 }
312 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
313 return
314}
315
316func zaggy(keyname string) (key *rsa.PublicKey) {
317 ziggylock.Lock()
318 key = zaggies[keyname]
319 ziggylock.Unlock()
320 if key != nil {
321 return
322 }
323 db := opendatabase()
324 row := db.QueryRow("select pubkey from xonkers where xid = ?", keyname)
325 var data string
326 err := row.Scan(&data)
327 if err != nil {
328 log.Printf("hitting the webs for missing pubkey: %s", keyname)
329 j, err := GetJunk(keyname)
330 if err != nil {
331 log.Printf("error getting %s pubkey: %s", keyname, err)
332 return
333 }
334 var ok bool
335 data, ok = jsonfindstring(j, []string{"publicKey", "publicKeyPem"})
336 if !ok {
337 log.Printf("error finding %s pubkey", keyname)
338 return
339 }
340 _, ok = jsonfindstring(j, []string{"publicKey", "owner"})
341 if !ok {
342 log.Printf("error finding %s pubkey owner", keyname)
343 return
344 }
345 _, key, err = pez(data)
346 if err != nil {
347 log.Printf("error decoding %s pubkey: %s", keyname, err)
348 return
349 }
350 _, err = stmtSaveBoxes.Exec(keyname, "", "", "", data)
351 if err != nil {
352 log.Printf("error saving key: %s", err)
353 }
354 } else {
355 _, key, err = pez(data)
356 if err != nil {
357 log.Printf("error decoding %s pubkey: %s", keyname, err)
358 return
359 }
360 }
361 ziggylock.Lock()
362 zaggies[keyname] = key
363 ziggylock.Unlock()
364 return
365}
366
367func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
368 db := opendatabase()
369 _, err := db.Exec("delete from xonkers where xid = ?", keyname)
370 if err != nil {
371 log.Printf("error deleting key: %s", err)
372 }
373 ziggylock.Lock()
374 delete(zaggies, keyname)
375 ziggylock.Unlock()
376 return zag(r, payload)
377}
378
379var thumbbiters map[int64]map[string]bool
380var thumblock sync.Mutex
381
382func bitethethumbs() {
383 rows, err := stmtThumbBiters.Query()
384 if err != nil {
385 log.Printf("error getting thumbbiters: %s", err)
386 return
387 }
388 defer rows.Close()
389 thumblock.Lock()
390 defer thumblock.Unlock()
391 thumbbiters = make(map[int64]map[string]bool)
392 for rows.Next() {
393 var userid int64
394 var name, wherefore string
395 err = rows.Scan(&userid, &name, &wherefore)
396 if err != nil {
397 log.Printf("error scanning zonker: %s", err)
398 continue
399 }
400 m := thumbbiters[userid]
401 if m == nil {
402 m = make(map[string]bool)
403 thumbbiters[userid] = m
404 }
405 m[name] = true
406 }
407}
408
409func thoudostbitethythumb(userid int64, who []string, objid string) bool {
410 thumblock.Lock()
411 biters := thumbbiters[userid]
412 thumblock.Unlock()
413 for _, w := range who {
414 if biters[w] {
415 return true
416 }
417 m := re_unurl.FindStringSubmatch(w)
418 if len(m) > 2 {
419 where := m[1]
420 if biters[where] {
421 return true
422 }
423 }
424 }
425 return false
426}
427
428func keymatch(keyname string, actor string, what string, userid int64) bool {
429 hash := strings.IndexByte(keyname, '#')
430 if hash == -1 {
431 hash = len(keyname)
432 }
433 owner := keyname[0:hash]
434 if owner == actor {
435 return true
436 }
437 return false
438}