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 "database/sql"
22 "fmt"
23 "html"
24 "html/template"
25 "log"
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 } else {
45 idx := strings.LastIndexByte(h.Honker, '/')
46 if idx != -1 {
47 h.Username = honkerhandle(h.Honker)
48 } else {
49 h.Username = h.Honker
50 }
51 if h.URL == "" {
52 h.URL = h.XID
53 }
54 }
55 zap := make(map[*Donk]bool)
56 h.HTML = cleanstring(h.Noise)
57 emuxifier := func(e string) string {
58 for _, d := range h.Donks {
59 if d.Name == e {
60 zap[d] = true
61 return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
62 }
63 }
64 return e
65 }
66 h.HTML = template.HTML(re_emus.ReplaceAllStringFunc(string(h.HTML), emuxifier))
67 for i := 0; i < len(h.Donks); i++ {
68 if zap[h.Donks[i]] {
69 copy(h.Donks[i:], h.Donks[i+1:])
70 h.Donks = h.Donks[:len(h.Donks)-1]
71 i--
72 }
73 }
74 }
75}
76
77func xfiltrate() string {
78 letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
79 db := opendatabase()
80 for {
81 var x int64
82 var b [16]byte
83 rand.Read(b[:])
84 for i, c := range b {
85 b[i] = letters[c&63]
86 }
87 s := string(b[:])
88 r := db.QueryRow("select honkid from honks where xid = ?", s)
89 err := r.Scan(&x)
90 if err == nil {
91 continue
92 }
93 if err != sql.ErrNoRows {
94 log.Panicf("err picking xid: %s", err)
95 }
96 r = db.QueryRow("select fileid from files where xid = ?", s)
97 err = r.Scan(&x)
98 if err == nil {
99 continue
100 }
101 if err != sql.ErrNoRows {
102 log.Panicf("err picking xid: %s", err)
103 }
104 return s
105 }
106}
107
108type Mention struct {
109 who string
110 where string
111}
112
113var re_mentions = regexp.MustCompile(`@[[:alnum:]]+@[[:alnum:].]+`)
114
115func grapevine(s string) []string {
116 m := re_mentions.FindAllString(s, -1)
117 var mentions []string
118 for i := range m {
119 where := gofish(m[i])
120 if where != "" {
121 mentions = append(mentions, where)
122 }
123 }
124 return mentions
125}
126
127func bunchofgrapes(s string) []Mention {
128 m := re_mentions.FindAllString(s, -1)
129 var mentions []Mention
130 for i := range m {
131 where := gofish(m[i])
132 if where != "" {
133 mentions = append(mentions, Mention{who: m[i], where: where})
134 }
135 }
136 return mentions
137}
138
139type Emu struct {
140 ID string
141 Name string
142}
143
144var re_link = regexp.MustCompile(`https?://[^\s"]+[\w/)]`)
145var re_emus = regexp.MustCompile(`:[[:alnum:]_]+:`)
146
147func herdofemus(noise string) []Emu {
148 m := re_emus.FindAllString(noise, -1)
149 m = oneofakind(m)
150 var emus []Emu
151 for _, e := range m {
152 fname := e[1 : len(e)-1]
153 url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
154 emus = append(emus, Emu{ID: url, Name: e})
155 }
156 return emus
157}
158
159func obfusbreak(s string) string {
160 s = strings.TrimSpace(s)
161 s = strings.Replace(s, "\r", "", -1)
162 s = html.EscapeString(s)
163 linkfn := func(url string) string {
164 addparen := false
165 adddot := false
166 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
167 url = url[:len(url)-1]
168 addparen = true
169 }
170 if strings.HasSuffix(url, ".") {
171 url = url[:len(url)-1]
172 adddot = true
173 }
174 url = fmt.Sprintf(`<a href="%s">%s</a>`, url, url)
175 if adddot {
176 url += "."
177 }
178 if addparen {
179 url += ")"
180 }
181 return url
182 }
183 s = re_link.ReplaceAllStringFunc(s, linkfn)
184
185 s = strings.Replace(s, "\n", "<br>", -1)
186 s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
187 where := gofish(m)
188 if where == "" {
189 return m
190 }
191 who := m[0 : 1+strings.IndexByte(m[1:], '@')]
192 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
193 html.EscapeString(where), html.EscapeString(who))
194 })
195 return s
196}
197
198var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
199
200func honkerhandle(h string) string {
201 m := re_unurl.FindStringSubmatch(h)
202 if len(m) > 2 {
203 return fmt.Sprintf("%s@%s", m[2], m[1])
204 }
205 return h
206}
207
208func prepend(s string, x []string) []string {
209 return append([]string{s}, x...)
210}
211
212func oneofakind(a []string) []string {
213 var x []string
214 for n, s := range a {
215 if s != "" {
216 x = append(x, s)
217 for i := n + 1; i < len(a); i++ {
218 if a[i] == s {
219 a[i] = ""
220 }
221 }
222 }
223 }
224 return x
225}
226
227var ziggies = make(map[string]*rsa.PrivateKey)
228var zaggies = make(map[string]*rsa.PublicKey)
229var ziggylock sync.Mutex
230
231func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
232 ziggylock.Lock()
233 key = ziggies[username]
234 ziggylock.Unlock()
235 if key == nil {
236 db := opendatabase()
237 row := db.QueryRow("select seckey from users where username = ?", username)
238 var data string
239 row.Scan(&data)
240 var err error
241 key, _, err = pez(data)
242 if err != nil {
243 log.Printf("error decoding %s seckey: %s", username, err)
244 return
245 }
246 ziggylock.Lock()
247 ziggies[username] = key
248 ziggylock.Unlock()
249 }
250 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
251 return
252}
253
254func zaggy(keyname string) (key *rsa.PublicKey) {
255 ziggylock.Lock()
256 key = zaggies[keyname]
257 ziggylock.Unlock()
258 if key != nil {
259 return
260 }
261 db := opendatabase()
262 row := db.QueryRow("select pubkey from honkers where flavor = 'key' and xid = ?", keyname)
263 var data string
264 err := row.Scan(&data)
265 savekey := false
266 if err != nil {
267 log.Printf("hitting the webs for missing pubkey: %s", keyname)
268 j, err := GetJunk(keyname)
269 if err != nil {
270 log.Printf("error getting %s pubkey: %s", keyname, err)
271 return
272 }
273 var ok bool
274 data, ok = jsonfindstring(j, []string{"publicKey", "publicKeyPem"})
275 if !ok {
276 log.Printf("error getting %s pubkey", keyname)
277 return
278 }
279 _, ok = jsonfindstring(j, []string{"publicKey", "owner"})
280 if !ok {
281 log.Printf("error getting %s pubkey owner", keyname)
282 return
283 }
284 savekey = true
285 }
286 _, key, err = pez(data)
287 if err != nil {
288 log.Printf("error decoding %s pubkey: %s", keyname, err)
289 return
290 }
291 ziggylock.Lock()
292 zaggies[keyname] = key
293 ziggylock.Unlock()
294 if savekey {
295 db.Exec("insert into honkers (name, xid, flavor, pubkey) values (?, ?, ?, ?)",
296 "", keyname, "key", data)
297 }
298 return
299}
300
301func keymatch(keyname string, actor string) bool {
302 return strings.HasPrefix(keyname, actor)
303}