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
152func obfusbreak(s string) string {
153 s = strings.TrimSpace(s)
154 s = strings.Replace(s, "\r", "", -1)
155 s = html.EscapeString(s)
156 linkfn := func(url string) string {
157 if url[0] == '@' {
158 return url
159 }
160 addparen := false
161 adddot := false
162 if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
163 url = url[:len(url)-1]
164 addparen = true
165 }
166 if strings.HasSuffix(url, ".") {
167 url = url[:len(url)-1]
168 adddot = true
169 }
170 url = fmt.Sprintf(`<a href="%s">%s</a>`, url, url)
171 if adddot {
172 url += "."
173 }
174 if addparen {
175 url += ")"
176 }
177 return url
178 }
179 s = re_link.ReplaceAllStringFunc(s, linkfn)
180
181 s = strings.Replace(s, "\n", "<br>", -1)
182 return s
183}
184
185func mentionize(s string) string {
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 s = re_urltions.ReplaceAllStringFunc(s, func(m string) string {
196 return fmt.Sprintf(`<span class="h-card"><a class="u-url mention" href="%s">%s</a></span>`,
197 html.EscapeString(m[1:]), html.EscapeString(m))
198 })
199 return s
200}
201
202var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
203
204func honkerhandle(h string) string {
205 m := re_unurl.FindStringSubmatch(h)
206 if len(m) > 2 {
207 return fmt.Sprintf("%s@%s", m[2], m[1])
208 }
209 return h
210}
211
212func prepend(s string, x []string) []string {
213 return append([]string{s}, x...)
214}
215
216func oneofakind(a []string) []string {
217 var x []string
218 for n, s := range a {
219 if s != "" {
220 x = append(x, s)
221 for i := n + 1; i < len(a); i++ {
222 if a[i] == s {
223 a[i] = ""
224 }
225 }
226 }
227 }
228 return x
229}
230
231var ziggies = make(map[string]*rsa.PrivateKey)
232var zaggies = make(map[string]*rsa.PublicKey)
233var ziggylock sync.Mutex
234
235func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
236 ziggylock.Lock()
237 key = ziggies[username]
238 ziggylock.Unlock()
239 if key == nil {
240 db := opendatabase()
241 row := db.QueryRow("select seckey from users where username = ?", username)
242 var data string
243 row.Scan(&data)
244 var err error
245 key, _, err = pez(data)
246 if err != nil {
247 log.Printf("error decoding %s seckey: %s", username, err)
248 return
249 }
250 ziggylock.Lock()
251 ziggies[username] = key
252 ziggylock.Unlock()
253 }
254 keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
255 return
256}
257
258func zaggy(keyname string) (key *rsa.PublicKey) {
259 ziggylock.Lock()
260 key = zaggies[keyname]
261 ziggylock.Unlock()
262 if key != nil {
263 return
264 }
265 db := opendatabase()
266 row := db.QueryRow("select pubkey from xonkers where xid = ?", keyname)
267 var data string
268 err := row.Scan(&data)
269 if err != nil {
270 log.Printf("hitting the webs for missing pubkey: %s", keyname)
271 j, err := GetJunk(keyname)
272 if err != nil {
273 log.Printf("error getting %s pubkey: %s", keyname, err)
274 return
275 }
276 var ok bool
277 data, ok = jsonfindstring(j, []string{"publicKey", "publicKeyPem"})
278 if !ok {
279 log.Printf("error finding %s pubkey", keyname)
280 return
281 }
282 _, ok = jsonfindstring(j, []string{"publicKey", "owner"})
283 if !ok {
284 log.Printf("error finding %s pubkey owner", keyname)
285 return
286 }
287 _, key, err = pez(data)
288 if err != nil {
289 log.Printf("error decoding %s pubkey: %s", keyname, err)
290 return
291 }
292 db.Exec("insert into xonkers (xid, ibox, obox, sbox, pubkey) values (?, ?, ?, ?, ?)",
293 keyname, "", "", "", data)
294 } else {
295 _, key, err = pez(data)
296 if err != nil {
297 log.Printf("error decoding %s pubkey: %s", keyname, err)
298 return
299 }
300 }
301 ziggylock.Lock()
302 zaggies[keyname] = key
303 ziggylock.Unlock()
304 return
305}
306
307func makeitworksomehowwithoutregardforkeycontinuity(keyname string, r *http.Request, payload []byte) (string, error) {
308 db := opendatabase()
309 db.Exec("delete from xonkers where xid = ?", keyname)
310 ziggylock.Lock()
311 delete(zaggies, keyname)
312 ziggylock.Unlock()
313 return zag(r, payload)
314}
315
316func thoudostbitethythumb(userid int64, who string) bool {
317 where := ""
318 m := re_unurl.FindStringSubmatch(who)
319 if len(m) > 2 {
320 where = m[1]
321 }
322 row := stmtThumbBiter.QueryRow(who, where, userid)
323 var id int64
324 err := row.Scan(&id)
325 if err != nil {
326 return false
327 }
328 return true
329}
330
331func keymatch(keyname string, actor string, userid int64) bool {
332 hash := strings.IndexByte(keyname, '#')
333 if hash == -1 {
334 hash = len(keyname)
335 }
336 owner := keyname[0:hash]
337 if owner == actor {
338 return true
339 }
340 row := stmtHasHonker.QueryRow(owner, userid)
341 var id int64
342 err := row.Scan(&id)
343 if err == nil {
344 log.Printf("allowing resigned content by %s", keyname)
345 return true
346 }
347 return false
348}