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 "regexp"
26 "strings"
27 "sync"
28)
29
30func reverbolate(honks []*Honk) {
31 for _, h := range honks {
32 h.What += "ed"
33 if h.Honker == "" {
34 h.Honker = "https://" + serverName + "/u/" + h.Username
35 if strings.IndexByte(h.XID, '/') == -1 {
36 h.URL = h.Honker + "/h/" + h.XID
37 } else {
38 h.URL = h.XID
39 }
40 if h.RID != "" && strings.IndexByte(h.RID, '/') == -1 {
41 h.RID = h.Honker + "/h/" + h.RID
42 }
43 } else {
44 idx := strings.LastIndexByte(h.Honker, '/')
45 if idx != -1 {
46 h.Username = honkerhandle(h.Honker)
47 } else {
48 h.Username = h.Honker
49 }
50 if h.URL == "" {
51 h.URL = h.XID
52 }
53 }
54 zap := make(map[*Donk]bool)
55 h.HTML = cleanstring(h.Noise)
56 emuxifier := func(e string) string {
57 for _, d := range h.Donks {
58 if d.Name == e {
59 zap[d] = true
60 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
61 }
62 }
63 return e
64 }
65 h.HTML = template.HTML(re_emus.ReplaceAllStringFunc(string(h.HTML), emuxifier))
66 j := 0
67 for i := 0; i < len(h.Donks); i++ {
68 if !zap[h.Donks[i]] {
69 h.Donks[j] = h.Donks[i]
70 j++
71 }
72 }
73 h.Donks = h.Donks[:j]
74 }
75}
76
77func xfiltrate() string {
78 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
79 for {
80 var b [18]byte
81 rand.Read(b[:])
82 for i, c := range b {
83 b[i] = letters[c&63]
84 }
85 s := string(b[:])
86 return s
87 }
88}
89
90type Mention struct {
91 who string
92 where string
93}
94
95var re_mentions = regexp.MustCompile(`@[[:alnum:]]+@[[:alnum:].]+`)
96var re_urltions = regexp.MustCompile(`@https://\S+`)
97
98func grapevine(s string) []string {
99 var mentions []string
100 m := re_mentions.FindAllString(s, -1)
101 for i := range m {
102 where := gofish(m[i])
103 if where != "" {
104 mentions = append(mentions, where)
105 }
106 }
107 m = re_urltions.FindAllString(s, -1)
108 for i := range m {
109 mentions = append(mentions, m[i][1:])
110 }
111 return mentions
112}
113
114func bunchofgrapes(s string) []Mention {
115 m := re_mentions.FindAllString(s, -1)
116 var mentions []Mention
117 for i := range m {
118 where := gofish(m[i])
119 if where != "" {
120 mentions = append(mentions, Mention{who: m[i], where: where})
121 }
122 }
123 m = re_urltions.FindAllString(s, -1)
124 for i := range m {
125 mentions = append(mentions, Mention{who: m[i][1:], where: m[i][1:]})
126 }
127 return mentions
128}
129
130type Emu struct {
131 ID string
132 Name string
133}
134
135var re_link = regexp.MustCompile(`@?https?://[^\s"]+[\w/)]`)
136var re_emus = regexp.MustCompile(`:[[:alnum:]_]+:`)
137
138func herdofemus(noise string) []Emu {
139 m := re_emus.FindAllString(noise, -1)
140 m = oneofakind(m)
141 var emus []Emu
142 for _, e := range m {
143 fname := e[1 : len(e)-1]
144 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
145 emus = append(emus, Emu{ID: url, Name: e})
146 }
147 return emus
148}
149
150func obfusbreak(s string) string {
151 s = strings.TrimSpace(s)
152 s = strings.Replace(s, "\r", "", -1)
153 s = html.EscapeString(s)
154 linkfn := func(url string) string {
155 if url[0] == '@' {
156 return url
157 }
158 addparen := false
159 adddot := false
160 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
161 url = url[:len(url)-1]
162 addparen = true
163 }
164 if strings.HasSuffix(url, ".") {
165 url = url[:len(url)-1]
166 adddot = true
167 }
168 url = fmt.Sprintf(`<a href="%s">%s</a>`, url, url)
169 if adddot {
170 url += "."
171 }
172 if addparen {
173 url += ")"
174 }
175 return url
176 }
177 s = re_link.ReplaceAllStringFunc(s, linkfn)
178
179 s = strings.Replace(s, "\n", "<br>", -1)
180 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
181 where := gofish(m)
182 if where == "" {
183 return m
184 }
185 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
186 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
187 html.EscapeString(where), html.EscapeString(who))
188 })
189 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
190 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
191 html.EscapeString(m[1:]), html.EscapeString(m))
192 })
193 return s
194}
195
196var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
197
198func honkerhandle(h string) string {
199 m := re_unurl.FindStringSubmatch(h)
200 if len(m) > 2 {
201 return fmt.Sprintf("%s@%s", m[2], m[1])
202 }
203 return h
204}
205
206func prepend(s string, x []string) []string {
207 return append([]string{s}, x...)
208}
209
210func oneofakind(a []string) []string {
211 var x []string
212 for n, s := range a {
213 if s != "" {
214 x = append(x, s)
215 for i := n + 1; i < len(a); i++ {
216 if a[i] == s {
217 a[i] = ""
218 }
219 }
220 }
221 }
222 return x
223}
224
225var ziggies = make(map[string]*rsa.PrivateKey)
226var zaggies = make(map[string]*rsa.PublicKey)
227var ziggylock sync.Mutex
228
229func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
230 ziggylock.Lock()
231 key = ziggies[username]
232 ziggylock.Unlock()
233 if key == nil {
234 db := opendatabase()
235 row := db.QueryRow("select seckey from users where username = ?", username)
236 var data string
237 row.Scan(&data)
238 var err error
239 key, _, err = pez(data)
240 if err != nil {
241 log.Printf("error decoding %s seckey: %s", username, err)
242 return
243 }
244 ziggylock.Lock()
245 ziggies[username] = key
246 ziggylock.Unlock()
247 }
248 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
249 return
250}
251
252func zaggy(keyname string) (key *rsa.PublicKey) {
253 ziggylock.Lock()
254 key = zaggies[keyname]
255 ziggylock.Unlock()
256 if key != nil {
257 return
258 }
259 db := opendatabase()
260 row := db.QueryRow("select pubkey from xonkers where xid = ?", keyname)
261 var data string
262 err := row.Scan(&data)
263 savekey := false
264 if err != nil {
265 log.Printf("hitting the webs for missing pubkey: %s", keyname)
266 j, err := GetJunk(keyname)
267 if err != nil {
268 log.Printf("error getting %s pubkey: %s", keyname, err)
269 return
270 }
271 var ok bool
272 data, ok = jsonfindstring(j, []string{"publicKey", "publicKeyPem"})
273 if !ok {
274 log.Printf("error getting %s pubkey", keyname)
275 return
276 }
277 _, ok = jsonfindstring(j, []string{"publicKey", "owner"})
278 if !ok {
279 log.Printf("error getting %s pubkey owner", keyname)
280 return
281 }
282 savekey = true
283 }
284 _, key, err = pez(data)
285 if err != nil {
286 log.Printf("error decoding %s pubkey: %s", keyname, err)
287 return
288 }
289 ziggylock.Lock()
290 zaggies[keyname] = key
291 ziggylock.Unlock()
292 if savekey {
293 db.Exec("insert into xonkers (xid, ibox, obox, sbox, pubkey) values (?, ?, ?, ?, ?)",
294 keyname, "", "", "", data)
295 }
296 return
297}
298
299func keymatch(keyname string, actor string) bool {
300 return strings.HasPrefix(keyname, actor)
301}