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 if h.RID != "" && strings.IndexByte(h.RID, '/') == -1 {
42 h.RID = h.Honker + "/h/" + h.RID
43 }
44 h.Noise = mentionize(h.Noise)
45 } else {
46 idx := strings.LastIndexByte(h.Honker, '/')
47 if idx != -1 {
48 h.Username = honkerhandle(h.Honker)
49 } else {
50 h.Username = h.Honker
51 }
52 if h.URL == "" {
53 h.URL = h.XID
54 }
55 }
56 zap := make(map[*Donk]bool)
57 h.HTML = cleanstring(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 xfiltrate() string {
80 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
81 for {
82 var b [18]byte
83 rand.Read(b[:])
84 for i, c := range b {
85 b[i] = letters[c&63]
86 }
87 s := string(b[:])
88 return s
89 }
90}
91
92type Mention struct {
93 who string
94 where string
95}
96
97var re_mentions = regexp.MustCompile(`@[[:alnum:]]+@[[:alnum:].]+`)
98var re_urltions = regexp.MustCompile(`@https://\S+`)
99
100func grapevine(s string) []string {
101 var mentions []string
102 m := re_mentions.FindAllString(s, -1)
103 for i := range m {
104 where := gofish(m[i])
105 if where != "" {
106 mentions = append(mentions, where)
107 }
108 }
109 m = re_urltions.FindAllString(s, -1)
110 for i := range m {
111 mentions = append(mentions, m[i][1:])
112 }
113 return mentions
114}
115
116func bunchofgrapes(s string) []Mention {
117 m := re_mentions.FindAllString(s, -1)
118 var mentions []Mention
119 for i := range m {
120 where := gofish(m[i])
121 if where != "" {
122 mentions = append(mentions, Mention{who: m[i], where: where})
123 }
124 }
125 m = re_urltions.FindAllString(s, -1)
126 for i := range m {
127 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
128 }
129 return mentions
130}
131
132type Emu struct {
133 ID string
134 Name string
135}
136
137var re_link = regexp.MustCompile(`@?https?://[^\s"]+[\w/)]`)
138var re_emus = regexp.MustCompile(`:[[:alnum:]_]+:`)
139
140func herdofemus(noise string) []Emu {
141 m := re_emus.FindAllString(noise, -1)
142 m = oneofakind(m)
143 var emus []Emu
144 for _, e := range m {
145 fname := e[1 : len(e)-1]
146 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
147 emus = append(emus, Emu{ID: url, Name: e})
148 }
149 return emus
150}
151
152var re_bolder = regexp.MustCompile(`(^|\W)\*\*([\w\s,.!?']+)\*\*($|\W)`)
153var re_italicer = regexp.MustCompile(`(^|\W)\*([\w\s,.!?']+)\*($|\W)`)
154func markitzero(s string) string {
155 s = re_bolder.ReplaceAllString(s, "$1<b>$2</b>$3")
156 s = re_italicer.ReplaceAllString(s, "$1<i>$2</i>$3")
157 return s
158}
159
160func obfusbreak(s string) string {
161 s = strings.TrimSpace(s)
162 s = strings.Replace(s, "\r", "", -1)
163 s = html.EscapeString(s)
164 // dammit go
165 s = strings.Replace(s, "'", "'", -1)
166 linkfn := func(url string) string {
167 if url[0] == '@' {
168 return url
169 }
170 addparen := false
171 adddot := false
172 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
173 url = url[:len(url)-1]
174 addparen = true
175 }
176 if strings.HasSuffix(url, ".") {
177 url = url[:len(url)-1]
178 adddot = true
179 }
180 url = fmt.Sprintf(`<a href="%s">%s</a>`, url, url)
181 if adddot {
182 url += "."
183 }
184 if addparen {
185 url += ")"
186 }
187 return url
188 }
189 s = re_link.ReplaceAllStringFunc(s, linkfn)
190
191 s = markitzero(s)
192
193 s = strings.Replace(s, "\n", "<br>", -1)
194 return s
195}
196
197func mentionize(s string) string {
198 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
199 where := gofish(m)
200 if where == "" {
201 return m
202 }
203 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
204 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
205 html.EscapeString(where), html.EscapeString(who))
206 })
207 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
208 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
209 html.EscapeString(m[1:]), html.EscapeString(m))
210 })
211 return s
212}
213
214var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
215
216func honkerhandle(h string) string {
217 m := re_unurl.FindStringSubmatch(h)
218 if len(m) > 2 {
219 return fmt.Sprintf("%s@%s", m[2], m[1])
220 }
221 return h
222}
223
224func prepend(s string, x []string) []string {
225 return append([]string{s}, x...)
226}
227
228func oneofakind(a []string) []string {
229 var x []string
230 for n, s := range a {
231 if s != "" {
232 x = append(x, s)
233 for i := n + 1; i < len(a); i++ {
234 if a[i] == s {
235 a[i] = ""
236 }
237 }
238 }
239 }
240 return x
241}
242
243var ziggies = make(map[string]*rsa.PrivateKey)
244var zaggies = make(map[string]*rsa.PublicKey)
245var ziggylock sync.Mutex
246
247func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
248 ziggylock.Lock()
249 key = ziggies[username]
250 ziggylock.Unlock()
251 if key == nil {
252 db := opendatabase()
253 row := db.QueryRow("select seckey from users where username = ?", username)
254 var data string
255 row.Scan(&data)
256 var err error
257 key, _, err = pez(data)
258 if err != nil {
259 log.Printf("error decoding %s seckey: %s", username, err)
260 return
261 }
262 ziggylock.Lock()
263 ziggies[username] = key
264 ziggylock.Unlock()
265 }
266 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
267 return
268}
269
270func zaggy(keyname string) (key *rsa.PublicKey) {
271 ziggylock.Lock()
272 key = zaggies[keyname]
273 ziggylock.Unlock()
274 if key != nil {
275 return
276 }
277 db := opendatabase()
278 row := db.QueryRow("select pubkey from xonkers where xid = ?", keyname)
279 var data string
280 err := row.Scan(&data)
281 if err != nil {
282 log.Printf("hitting the webs for missing pubkey: %s", keyname)
283 j, err := GetJunk(keyname)
284 if err != nil {
285 log.Printf("error getting %s pubkey: %s", keyname, err)
286 return
287 }
288 var ok bool
289 data, ok = jsonfindstring(j, []string{"publicKey", "publicKeyPem"})
290 if !ok {
291 log.Printf("error finding %s pubkey", keyname)
292 return
293 }
294 _, ok = jsonfindstring(j, []string{"publicKey", "owner"})
295 if !ok {
296 log.Printf("error finding %s pubkey owner", keyname)
297 return
298 }
299 _, key, err = pez(data)
300 if err != nil {
301 log.Printf("error decoding %s pubkey: %s", keyname, err)
302 return
303 }
304 db.Exec("insert into xonkers (xid, ibox, obox, sbox, pubkey) values (?, ?, ?, ?, ?)",
305 keyname, "", "", "", data)
306 } else {
307 _, key, err = pez(data)
308 if err != nil {
309 log.Printf("error decoding %s pubkey: %s", keyname, err)
310 return
311 }
312 }
313 ziggylock.Lock()
314 zaggies[keyname] = key
315 ziggylock.Unlock()
316 return
317}
318
319func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
320 db := opendatabase()
321 db.Exec("delete from xonkers where xid = ?", keyname)
322 ziggylock.Lock()
323 delete(zaggies, keyname)
324 ziggylock.Unlock()
325 return zag(r, payload)
326}
327
328func thoudostbitethythumb(userid int64, who string) bool {
329 where := ""
330 m := re_unurl.FindStringSubmatch(who)
331 if len(m) > 2 {
332 where = m[1]
333 }
334 row := stmtThumbBiter.QueryRow(who, where, userid)
335 var id int64
336 err := row.Scan(&id)
337 if err != nil {
338 return false
339 }
340 return true
341}
342
343func keymatch(keyname string, actor string, userid int64) bool {
344 hash := strings.IndexByte(keyname, '#')
345 if hash == -1 {
346 hash = len(keyname)
347 }
348 owner := keyname[0:hash]
349 if owner == actor {
350 return true
351 }
352 row := stmtHasHonker.QueryRow(owner, userid)
353 var id int64
354 err := row.Scan(&id)
355 if err == nil {
356 log.Printf("allowing resigned content by %s", keyname)
357 return true
358 }
359 return false
360}