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