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//
// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
package main
import (
"crypto/rand"
"crypto/rsa"
"database/sql"
"fmt"
"html"
"html/template"
"log"
"regexp"
"strings"
"sync"
)
func reverbolate(honks []*Honk) {
for _, h := range honks {
h.What += "ed"
if h.Honker == "" {
h.Honker = "https://" + serverName + "/u/" + h.Username
if strings.IndexByte(h.XID, '/') == -1 {
h.URL = h.Honker + "/h/" + h.XID
} else {
h.URL = h.XID
}
} else {
idx := strings.LastIndexByte(h.Honker, '/')
if idx != -1 {
h.Username = honkerhandle(h.Honker)
} else {
h.Username = h.Honker
}
if h.URL == "" {
h.URL = h.XID
}
}
zap := make(map[*Donk]bool)
h.HTML = cleanstring(h.Noise)
emuxifier := func(e string) string {
for _, d := range h.Donks {
if d.Name == e {
zap[d] = true
return fmt.Sprintf(`<img class="emu" title="%s" src="/d/%s">`, d.Name, d.XID)
}
}
return e
}
h.HTML = template.HTML(re_emus.ReplaceAllStringFunc(string(h.HTML), emuxifier))
for i := 0; i < len(h.Donks); i++ {
if zap[h.Donks[i]] {
copy(h.Donks[i:], h.Donks[i+1:])
h.Donks = h.Donks[:len(h.Donks)-1]
i--
}
}
}
}
func xfiltrate() string {
letters := "BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz1234567891234567891234"
db := opendatabase()
for {
var x int64
var b [16]byte
rand.Read(b[:])
for i, c := range b {
b[i] = letters[c&63]
}
s := string(b[:])
r := db.QueryRow("select honkid from honks where xid = ?", s)
err := r.Scan(&x)
if err == nil {
continue
}
if err != sql.ErrNoRows {
log.Printf("err picking xid: %s", err)
return ""
}
r = db.QueryRow("select fileid from files where name = ?", s)
err = r.Scan(&x)
if err == nil {
continue
}
if err != sql.ErrNoRows {
log.Printf("err picking xid: %s", err)
return ""
}
return s
}
}
type Mention struct {
who string
where string
}
var re_mentions = regexp.MustCompile(`@[[:alnum:]]+@[[:alnum:].]+`)
func grapevine(s string) []string {
m := re_mentions.FindAllString(s, -1)
var mentions []string
for i := range m {
where := gofish(m[i])
if where != "" {
mentions = append(mentions, where)
}
}
return mentions
}
func bunchofgrapes(s string) []Mention {
m := re_mentions.FindAllString(s, -1)
var mentions []Mention
for i := range m {
where := gofish(m[i])
if where != "" {
mentions = append(mentions, Mention{who: m[i], where: where})
}
}
return mentions
}
type Emu struct {
ID string
Name string
}
var re_link = regexp.MustCompile(`https?://[^\s"]+[\w/)]`)
var re_emus = regexp.MustCompile(`:[[:alnum:]_]+:`)
func herdofemus(noise string) []Emu {
m := re_emus.FindAllString(noise, -1)
m = oneofakind(m)
var emus []Emu
for _, e := range m {
fname := e[1 : len(e)-1]
url := fmt.Sprintf("https://%s/emu/%s.png", serverName, fname)
emus = append(emus, Emu{ID: url, Name: e})
}
return emus
}
func obfusbreak(s string) string {
s = strings.TrimSpace(s)
s = strings.Replace(s, "\r", "", -1)
s = html.EscapeString(s)
linkfn := func(url string) string {
addparen := false
adddot := false
if strings.HasSuffix(url, ")") && strings.IndexByte(url, '(') == -1 {
url = url[:len(url)-1]
addparen = true
}
if strings.HasSuffix(url, ".") {
url = url[:len(url)-1]
adddot = true
}
url = fmt.Sprintf(`<a href="%s">%s</a>`, url, url)
if adddot {
url += "."
}
if addparen {
url += ")"
}
return url
}
s = re_link.ReplaceAllStringFunc(s, linkfn)
s = strings.Replace(s, "\n", "<br>", -1)
s = re_mentions.ReplaceAllStringFunc(s, func(m string) string {
return fmt.Sprintf(`<a href="%s">%s</a>`, html.EscapeString(gofish(m)),
html.EscapeString(m))
})
return s
}
var re_unurl = regexp.MustCompile("https://([^/]+).*/([^/]+)")
func honkerhandle(h string) string {
m := re_unurl.FindStringSubmatch(h)
if len(m) > 2 {
return fmt.Sprintf("%s@%s", m[2], m[1])
}
return h
}
func prepend(s string, x []string) []string {
return append([]string{s}, x...)
}
func oneofakind(a []string) []string {
var x []string
for n, s := range a {
if s != "" {
x = append(x, s)
for i := n + 1; i < len(a); i++ {
if a[i] == s {
a[i] = ""
}
}
}
}
return x
}
var ziggies = make(map[string]*rsa.PrivateKey)
var ziggylock sync.Mutex
func ziggy(username string) (keyname string, key *rsa.PrivateKey) {
ziggylock.Lock()
defer ziggylock.Unlock()
key = ziggies[username]
if key == nil {
db := opendatabase()
row := db.QueryRow("select seckey from users where username = ?", username)
var data string
row.Scan(&data)
var err error
key, _, err = pez(data)
if err != nil {
log.Printf("error loading %s seckey: %s", username, err)
return
}
}
keyname = fmt.Sprintf("https://%s/u/%s#key", serverName, username)
return
}
func zaggy(keyname string) (key *rsa.PublicKey) {
db := opendatabase()
row := db.QueryRow("select pubkey from honkers where flavor = 'key' and xid = ?", keyname)
var data string
err := row.Scan(&data)
savekey := false
if err != nil {
savekey = true
j, err := GetJunk(keyname)
if err != nil {
log.Printf("error getting %s pubkey: %s", keyname, err)
return
}
var ok bool
data, ok = jsonfindstring(j, []string{"publicKey", "publicKeyPem"})
if !ok {
log.Printf("error getting %s pubkey", keyname)
return
}
_, ok = jsonfindstring(j, []string{"publicKey", "owner"})
if !ok {
log.Printf("error getting %s pubkey owner", keyname)
return
}
}
_, key, err = pez(data)
if err != nil {
log.Printf("error getting %s pubkey: %s", keyname, err)
return
}
if savekey {
db.Exec("insert into honkers (name, xid, flavor, pubkey) values (?, ?, ?, ?)",
"", keyname, "key", data)
}
return
}
func keymatch(keyname string, actor string) bool {
return strings.HasPrefix(keyname, actor)
}