2018-07-22 01:52:49 +00:00
|
|
|
package main
|
|
|
|
|
2018-07-30 06:12:09 +00:00
|
|
|
// TODO learn about chan chan's
|
|
|
|
// http://marcio.io/2015/07/handling-1-million-requests-per-minute-with-golang/
|
2018-07-29 06:45:12 +00:00
|
|
|
|
2018-07-22 01:52:49 +00:00
|
|
|
import (
|
2018-07-31 05:51:46 +00:00
|
|
|
"bufio"
|
|
|
|
"bytes"
|
|
|
|
"crypto/rand"
|
|
|
|
"encoding/base64"
|
|
|
|
"flag"
|
|
|
|
"fmt"
|
|
|
|
"io"
|
|
|
|
"io/ioutil"
|
|
|
|
"net"
|
|
|
|
"net/http"
|
|
|
|
"net/url"
|
|
|
|
"os"
|
|
|
|
"strconv"
|
|
|
|
"strings"
|
|
|
|
"sync"
|
|
|
|
"time"
|
|
|
|
|
|
|
|
"gopkg.in/yaml.v2"
|
2018-07-22 01:52:49 +00:00
|
|
|
)
|
|
|
|
|
2018-07-30 06:12:09 +00:00
|
|
|
// I'm not sure how to pass nested structs, so I de-nested this.
|
|
|
|
// TODO: Learn if passing nested structs is desirable?
|
|
|
|
type Conf struct {
|
2018-07-31 05:51:46 +00:00
|
|
|
Port uint `yaml:"port,omitempty"`
|
|
|
|
Mailer ConfMailer
|
2018-07-30 06:12:09 +00:00
|
|
|
}
|
2018-07-30 05:16:09 +00:00
|
|
|
type ConfMailer struct {
|
2018-07-31 05:51:46 +00:00
|
|
|
Url string `yaml:"url,omitempty"`
|
|
|
|
ApiKey string `yaml:"api_key,omitempty"`
|
|
|
|
From string `yaml:"from,omitempty"`
|
2018-07-30 05:16:09 +00:00
|
|
|
}
|
2018-07-29 22:58:15 +00:00
|
|
|
|
2018-07-30 23:02:21 +00:00
|
|
|
type tcpUser struct {
|
2018-07-31 05:51:46 +00:00
|
|
|
bufConn bufferedConn
|
|
|
|
userCount chan int
|
|
|
|
email string
|
2018-07-30 23:02:21 +00:00
|
|
|
}
|
|
|
|
|
2018-07-30 06:12:09 +00:00
|
|
|
// So we can peek at net.Conn, which we can't do natively
|
|
|
|
// https://stackoverflow.com/questions/51472020/how-to-get-the-size-of-available-tcp-data
|
2018-07-29 06:45:12 +00:00
|
|
|
type bufferedConn struct {
|
|
|
|
r *bufio.Reader
|
|
|
|
rout io.Reader
|
|
|
|
net.Conn
|
|
|
|
}
|
|
|
|
|
|
|
|
func newBufferedConn(c net.Conn) bufferedConn {
|
|
|
|
return bufferedConn{bufio.NewReader(c), nil, c}
|
|
|
|
}
|
|
|
|
|
|
|
|
func (b bufferedConn) Peek(n int) ([]byte, error) {
|
|
|
|
return b.r.Peek(n)
|
|
|
|
}
|
|
|
|
|
2018-07-31 05:51:46 +00:00
|
|
|
func (b bufferedConn) Buffered() int {
|
2018-07-29 06:45:12 +00:00
|
|
|
return b.r.Buffered()
|
|
|
|
}
|
|
|
|
|
|
|
|
func (b bufferedConn) Read(p []byte) (int, error) {
|
|
|
|
if b.rout != nil {
|
|
|
|
return b.rout.Read(p)
|
|
|
|
}
|
|
|
|
return b.r.Read(p)
|
|
|
|
}
|
|
|
|
|
2018-07-30 06:12:09 +00:00
|
|
|
// Just making these all globals right now
|
|
|
|
// because... I can clean it up later
|
2018-07-22 03:58:05 +00:00
|
|
|
type myMsg struct {
|
2018-07-31 05:51:46 +00:00
|
|
|
sender net.Conn
|
|
|
|
bytes []byte
|
|
|
|
receivedAt time.Time
|
|
|
|
channel string
|
|
|
|
email string
|
2018-07-22 03:58:05 +00:00
|
|
|
}
|
|
|
|
|
2018-07-29 06:45:12 +00:00
|
|
|
var firstMsgs chan myMsg
|
2018-07-31 05:51:46 +00:00
|
|
|
|
2018-07-30 23:02:21 +00:00
|
|
|
//var myRooms map[string](chan myMsg)
|
2018-07-30 06:12:09 +00:00
|
|
|
var myMsgs chan myMsg
|
2018-07-31 05:51:46 +00:00
|
|
|
|
2018-07-30 23:02:21 +00:00
|
|
|
//var myUnsortedConns map[net.Conn]bool
|
2018-07-29 06:45:12 +00:00
|
|
|
var newConns chan net.Conn
|
2018-07-30 06:12:09 +00:00
|
|
|
var newTcpChat chan bufferedConn
|
2018-07-30 23:02:21 +00:00
|
|
|
var authTcpChat chan tcpUser
|
2018-07-30 06:12:09 +00:00
|
|
|
var delTcpChat chan bufferedConn
|
|
|
|
var newHttpChat chan bufferedConn
|
2018-07-31 05:51:46 +00:00
|
|
|
var newHttpClient chan bufferedConn
|
2018-07-30 06:12:09 +00:00
|
|
|
var delHttpChat chan bufferedConn
|
2018-07-22 03:58:05 +00:00
|
|
|
|
2018-07-22 01:52:49 +00:00
|
|
|
func usage() {
|
2018-07-31 05:51:46 +00:00
|
|
|
fmt.Fprintf(os.Stderr, "\nusage: go run chatserver.go\n")
|
|
|
|
flag.PrintDefaults()
|
|
|
|
fmt.Println()
|
2018-07-22 01:52:49 +00:00
|
|
|
|
2018-07-31 05:51:46 +00:00
|
|
|
os.Exit(1)
|
2018-07-22 01:52:49 +00:00
|
|
|
}
|
|
|
|
|
2018-07-30 05:16:09 +00:00
|
|
|
// https://blog.questionable.services/article/generating-secure-random-numbers-crypto-rand/
|
|
|
|
func genAuthCode() (string, error) {
|
2018-07-31 05:51:46 +00:00
|
|
|
n := 12
|
2018-07-30 05:16:09 +00:00
|
|
|
b := make([]byte, n)
|
|
|
|
_, err := rand.Read(b)
|
2018-07-31 05:51:46 +00:00
|
|
|
// Note that err == nil only if we read len(b) bytes.
|
2018-07-30 05:16:09 +00:00
|
|
|
if err != nil {
|
|
|
|
return "", err
|
|
|
|
}
|
|
|
|
return base64.URLEncoding.EncodeToString(b), nil
|
|
|
|
}
|
|
|
|
|
2018-07-30 06:17:35 +00:00
|
|
|
func handleRaw(bufConn bufferedConn) {
|
2018-07-31 05:51:46 +00:00
|
|
|
// TODO
|
|
|
|
// What happens if this is being read from range
|
|
|
|
// when it's being added here (data race)?
|
|
|
|
// Should I use a channel here instead?
|
|
|
|
// TODO see https://jameshfisher.com/2017/04/18/golang-tcp-server.html
|
|
|
|
|
|
|
|
var email string
|
|
|
|
var code string
|
|
|
|
var authn bool
|
|
|
|
|
|
|
|
// Handle all subsequent packets
|
|
|
|
buffer := make([]byte, 1024)
|
|
|
|
for {
|
|
|
|
//fmt.Fprintf(os.Stdout, "[raw] Waiting for message...\n")
|
|
|
|
count, err := bufConn.Read(buffer)
|
|
|
|
if nil != err {
|
|
|
|
if io.EOF != err {
|
|
|
|
fmt.Fprintf(os.Stderr, "Non-EOF socket error: %s\n", err)
|
|
|
|
}
|
|
|
|
fmt.Fprintf(os.Stdout, "Ending socket\n")
|
|
|
|
|
|
|
|
delTcpChat <- bufConn
|
|
|
|
break
|
|
|
|
}
|
|
|
|
buf := buffer[:count]
|
|
|
|
|
|
|
|
// Fun fact: if the buffer's current length (not capacity) is 0
|
|
|
|
// then the Read returns 0 without error
|
|
|
|
if 0 == count {
|
|
|
|
fmt.Fprintf(os.Stdout, "Weird")
|
|
|
|
break
|
|
|
|
}
|
|
|
|
|
|
|
|
if !authn {
|
|
|
|
if "" == email {
|
|
|
|
// Indeed telnet sends CRLF as part of the message
|
|
|
|
//fmt.Fprintf(os.Stdout, "buf{%s}\n", buf[:count])
|
|
|
|
|
|
|
|
// TODO use safer email testing
|
|
|
|
email = strings.TrimSpace(string(buf[:count]))
|
|
|
|
emailParts := strings.Split(email, "@")
|
|
|
|
if 2 != len(emailParts) {
|
|
|
|
fmt.Fprintf(bufConn, "Email: ")
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
|
|
|
|
// Debugging any weird characters as part of the message (just CRLF)
|
|
|
|
//fmt.Fprintf(os.Stdout, "email: '%v'\n", []byte(email))
|
|
|
|
|
|
|
|
// Just for a fun little bit of puzzah
|
|
|
|
// Note: Reaction times are about 100ms
|
|
|
|
// Procesing times are about 250ms
|
|
|
|
// Right around 300ms is about when a person literally begins to get bored (begin context switching)
|
|
|
|
// Therefore any interaction should take longer than 100ms (time to register)
|
|
|
|
// and either engage the user or complete before reaching 300ms (not yet bored)
|
|
|
|
// This little ditty is meant to act as a psuedo-progress bar to engage the user
|
|
|
|
// Aside: a keystroke typically takes >=50s to type (probably closer to 200ms between words)
|
|
|
|
// https://stackoverflow.com/questions/22505698/what-is-a-typical-keypress-duration
|
|
|
|
var wg sync.WaitGroup
|
|
|
|
wg.Add(1)
|
|
|
|
go func() {
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
|
|
const msg = "Mailing auth code..."
|
|
|
|
for _, r := range msg {
|
|
|
|
time.Sleep(20 * time.Millisecond)
|
|
|
|
fmt.Fprintf(bufConn, string(r))
|
|
|
|
}
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
|
|
wg.Done()
|
|
|
|
}()
|
|
|
|
if "" != config.Mailer.ApiKey {
|
|
|
|
wg.Add(1)
|
|
|
|
go func() {
|
|
|
|
code, err = sendAuthCode(config.Mailer, strings.TrimSpace(email))
|
|
|
|
wg.Done()
|
|
|
|
}()
|
|
|
|
} else {
|
|
|
|
code, err = genAuthCode()
|
|
|
|
}
|
|
|
|
wg.Wait()
|
|
|
|
if nil != err {
|
|
|
|
// TODO handle better
|
|
|
|
// (not sure why a random number would fail,
|
|
|
|
// but on a machine without internet the calls
|
|
|
|
// to mailgun APIs would fail)
|
|
|
|
panic(err)
|
|
|
|
}
|
|
|
|
// so I don't have to actually go check my email
|
|
|
|
fmt.Fprintf(os.Stdout, "\n== AUTHORIZATION ==\n[cheat code for %s]: %s\n", email, code)
|
|
|
|
time.Sleep(150 * time.Millisecond)
|
|
|
|
fmt.Fprintf(bufConn, " done\n")
|
|
|
|
time.Sleep(150 * time.Millisecond)
|
|
|
|
fmt.Fprintf(bufConn, "Auth Code: ")
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
|
|
|
|
if code != strings.TrimSpace(string(buf[:count])) {
|
|
|
|
fmt.Fprintf(bufConn, "Incorrect Code\nAuth Code: ")
|
|
|
|
} else {
|
|
|
|
authn = true
|
|
|
|
time.Sleep(150 * time.Millisecond)
|
|
|
|
fmt.Fprintf(bufConn, "\n")
|
|
|
|
u := tcpUser{
|
|
|
|
bufConn: bufConn,
|
|
|
|
email: email,
|
|
|
|
userCount: make(chan int, 1),
|
|
|
|
}
|
|
|
|
authTcpChat <- u
|
|
|
|
// prevent data race on len(myRawConns)
|
|
|
|
// XXX (there can't be a race between these two lines, right?)
|
|
|
|
count := <-u.userCount
|
|
|
|
u.userCount = nil
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
|
|
fmt.Fprintf(bufConn, "\n")
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
|
|
fmt.Fprintf(bufConn, "Welcome to #general (%d users)!", count)
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
|
|
fmt.Fprintf(bufConn, "\n")
|
|
|
|
time.Sleep(50 * time.Millisecond)
|
|
|
|
// TODO /help /join <room> /users /channels /block <user> /upgrade <http/ws>
|
|
|
|
//fmt.Fprintf(bufConn, "(TODO `/help' for list of commands)")
|
|
|
|
time.Sleep(100 * time.Millisecond)
|
|
|
|
fmt.Fprintf(bufConn, "\n")
|
|
|
|
|
|
|
|
// this would be cool, but won't work since other messages will come
|
|
|
|
// in before the person responds
|
|
|
|
//fmt.Fprintf(bufConn, "\n%s> ", email)
|
|
|
|
}
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
|
|
|
|
//fmt.Fprintf(os.Stdout, "Queing message...\n")
|
|
|
|
//myRooms["general"] <- myMsg{
|
|
|
|
myMsgs <- myMsg{
|
|
|
|
receivedAt: time.Now(),
|
|
|
|
sender: bufConn,
|
|
|
|
bytes: buf[0:count],
|
|
|
|
channel: "general",
|
|
|
|
email: email,
|
|
|
|
}
|
|
|
|
//fmt.Fprintf(bufConn, "> ")
|
|
|
|
}
|
2018-07-29 06:45:12 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
func handleSorted(conn bufferedConn) {
|
2018-07-31 05:51:46 +00:00
|
|
|
// Wish List for protocol detection
|
|
|
|
// * PROXY protocol (and loop)
|
|
|
|
// * HTTP CONNECT (proxy) (and loop)
|
|
|
|
// * tls (and loop) https://github.com/polvi/sni
|
|
|
|
// * http/ws
|
|
|
|
// * irc
|
|
|
|
// * fallback to telnet
|
|
|
|
|
|
|
|
// At this piont we've already at least one byte via Peek()
|
|
|
|
// so the first packet is available in the buffer
|
|
|
|
|
|
|
|
// Note: Realistically no tls/http/irc client is going to send so few bytes
|
|
|
|
// (and no router is going to chunk so small)
|
|
|
|
// that it cannot reasonably detect the protocol in the first packet
|
|
|
|
// However, typical MTU is 1,500 and HTTP can have a 2k URL
|
|
|
|
// so expecting to find the "HTTP/1.1" in the Peek is not always reasonable
|
|
|
|
n := conn.Buffered()
|
|
|
|
firstMsg, err := conn.Peek(n)
|
|
|
|
if nil != err {
|
|
|
|
conn.Close()
|
|
|
|
return
|
|
|
|
}
|
|
|
|
var protocol string
|
|
|
|
// between A and z
|
|
|
|
if firstMsg[0] >= 65 && firstMsg[0] <= 122 {
|
|
|
|
i := bytes.Index(firstMsg, []byte(" /"))
|
|
|
|
if -1 != i {
|
|
|
|
protocol = "HTTP"
|
|
|
|
// very likely HTTP
|
|
|
|
j := bytes.IndexAny(firstMsg, "\r\n")
|
|
|
|
if -1 != j {
|
|
|
|
k := bytes.Index(bytes.ToLower(firstMsg[:j]), []byte("HTTP/1"))
|
|
|
|
if -1 != k {
|
|
|
|
// positively HTTP
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else if 0x16 /*22*/ == firstMsg[0] {
|
|
|
|
// Because I don't always remember off the top of my head what the first byte is
|
|
|
|
// http://blog.fourthbit.com/2014/12/23/traffic-analysis-of-an-ssl-slash-tls-session
|
|
|
|
// https://tlseminar.github.io/first-few-milliseconds/
|
|
|
|
// TODO I want to learn about ALPN
|
|
|
|
protocol = "TLS"
|
|
|
|
}
|
|
|
|
|
|
|
|
if "" == protocol {
|
|
|
|
fmt.Fprintf(conn, "\n\nWelcome to Sample Chat! You're not an HTTP client, assuming Telnet.\nYou must authenticate via email to participate\n\nEmail: ")
|
|
|
|
newTcpChat <- conn
|
|
|
|
return
|
|
|
|
} else if "HTTP" != protocol {
|
|
|
|
defer conn.Close()
|
|
|
|
fmt.Fprintf(conn, "\n\nNot yet supported. Try HTTP or Telnet\n\n")
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
newHttpClient <- conn
|
|
|
|
|
|
|
|
/*
|
|
|
|
firstMsgs <- myMsg{
|
|
|
|
receivedAt: time.Now(),
|
|
|
|
sender: conn,
|
|
|
|
bytes: firstMsg,
|
|
|
|
channel: "general",
|
|
|
|
}
|
|
|
|
|
|
|
|
// TODO
|
|
|
|
// * TCP-CHAT
|
|
|
|
// * HTTP
|
|
|
|
// * TLS
|
|
|
|
|
|
|
|
// Handle all subsequent packets
|
|
|
|
buf := make([]byte, 1024)
|
|
|
|
for {
|
|
|
|
fmt.Fprintf(os.Stdout, "[sortable] Waiting for message...\n")
|
|
|
|
count, err := conn.Read(buf)
|
|
|
|
if nil != err {
|
|
|
|
if io.EOF != err {
|
|
|
|
fmt.Fprintf(os.Stderr, "Non-EOF socket error: %s\n", err)
|
|
|
|
}
|
|
|
|
fmt.Fprintf(os.Stdout, "Ending socket\n")
|
|
|
|
break
|
|
|
|
}
|
|
|
|
// Fun fact: if the buffer's current length (not capacity) is 0
|
|
|
|
// then the Read returns 0 without error
|
|
|
|
if 0 == count {
|
|
|
|
// fmt.Fprintf(os.Stdout, "Weird")
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
//myRooms["general"] <- myMsg{
|
|
|
|
myMsgs <- myMsg{
|
|
|
|
receivedAt: time.Now(),
|
|
|
|
sender: conn,
|
|
|
|
bytes: buf[0:count],
|
|
|
|
channel: "general",
|
|
|
|
}
|
|
|
|
}
|
|
|
|
*/
|
2018-07-22 01:52:49 +00:00
|
|
|
}
|
|
|
|
|
2018-07-30 05:16:09 +00:00
|
|
|
func handleConnection(netConn net.Conn) {
|
2018-07-31 05:51:46 +00:00
|
|
|
ts := time.Now()
|
|
|
|
fmt.Fprintf(os.Stdout, "[New Connection] (%s) welcome %s\n", ts, netConn.RemoteAddr().String())
|
2018-07-29 06:45:12 +00:00
|
|
|
|
2018-07-31 05:51:46 +00:00
|
|
|
m := sync.Mutex{}
|
|
|
|
virgin := true
|
2018-07-29 06:45:12 +00:00
|
|
|
|
2018-07-31 05:51:46 +00:00
|
|
|
// Why don't these work?
|
|
|
|
//buf := make([]byte, 0, 1024)
|
|
|
|
//buf := []byte{}
|
|
|
|
// But this does
|
2018-07-29 06:45:12 +00:00
|
|
|
|
2018-07-30 05:16:09 +00:00
|
|
|
bufConn := newBufferedConn(netConn)
|
2018-07-31 05:51:46 +00:00
|
|
|
//myUnsortedConns[bufConn] = true
|
|
|
|
go func() {
|
|
|
|
// Handle First Packet
|
|
|
|
_, err := bufConn.Peek(1)
|
|
|
|
//fmsg, err := bufConn.Peek(1)
|
|
|
|
if nil != err {
|
|
|
|
panic(err)
|
|
|
|
}
|
|
|
|
//fmt.Fprintf(os.Stdout, "[First Byte] %s\n", fmsg)
|
|
|
|
|
|
|
|
m.Lock()
|
|
|
|
if virgin {
|
|
|
|
virgin = false
|
|
|
|
newHttpChat <- bufConn
|
|
|
|
} else {
|
|
|
|
newTcpChat <- bufConn
|
|
|
|
}
|
|
|
|
m.Unlock()
|
|
|
|
}()
|
|
|
|
|
|
|
|
time.Sleep(250 * 1000000)
|
|
|
|
// If we still haven't received data from the client
|
|
|
|
// assume that the client must be expecting a welcome from us
|
|
|
|
m.Lock()
|
|
|
|
if virgin {
|
|
|
|
virgin = false
|
|
|
|
// don't block for this
|
|
|
|
// let it be handled after the unlock
|
|
|
|
defer fmt.Fprintf(netConn, "\n\nWelcome to Sample Chat! You appear to be using Telnet.\nYou must authenticate via email to participate\n\nEmail: ")
|
|
|
|
}
|
|
|
|
m.Unlock()
|
2018-07-29 06:45:12 +00:00
|
|
|
}
|
|
|
|
|
2018-07-30 05:16:09 +00:00
|
|
|
func sendAuthCode(cnf ConfMailer, to string) (string, error) {
|
2018-07-31 05:51:46 +00:00
|
|
|
code, err := genAuthCode()
|
|
|
|
if nil != err {
|
|
|
|
return "", err
|
|
|
|
}
|
2018-07-30 05:16:09 +00:00
|
|
|
|
2018-07-31 05:51:46 +00:00
|
|
|
// TODO use go text templates with HTML escaping
|
|
|
|
text := "Your authorization code:\n\n" + code
|
|
|
|
html := "Your authorization code:<br><br>" + code
|
2018-07-30 05:16:09 +00:00
|
|
|
|
2018-07-31 05:51:46 +00:00
|
|
|
// https://stackoverflow.com/questions/24493116/how-to-send-a-post-request-in-go
|
|
|
|
// https://stackoverflow.com/questions/16673766/basic-http-auth-in-go
|
2018-07-30 05:16:09 +00:00
|
|
|
client := http.Client{}
|
|
|
|
|
|
|
|
form := url.Values{}
|
|
|
|
form.Add("from", cnf.From)
|
|
|
|
form.Add("to", to)
|
2018-07-31 05:51:46 +00:00
|
|
|
form.Add("subject", "Sample Chat Auth Code: "+code)
|
2018-07-30 05:16:09 +00:00
|
|
|
form.Add("text", text)
|
|
|
|
form.Add("html", html)
|
|
|
|
|
|
|
|
req, err := http.NewRequest("POST", cnf.Url, strings.NewReader(form.Encode()))
|
2018-07-31 05:51:46 +00:00
|
|
|
if nil != err {
|
|
|
|
return "", err
|
|
|
|
}
|
2018-07-30 05:16:09 +00:00
|
|
|
//req.PostForm = form
|
|
|
|
req.Header.Add("User-Agent", "golang http.Client - Sample Chat App Authenticator")
|
|
|
|
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
|
|
|
|
req.SetBasicAuth("api", cnf.ApiKey)
|
|
|
|
|
2018-07-31 05:51:46 +00:00
|
|
|
resp, err := client.Do(req)
|
|
|
|
if nil != err {
|
|
|
|
return "", err
|
|
|
|
}
|
|
|
|
|
|
|
|
defer resp.Body.Close()
|
|
|
|
// Security XXX
|
|
|
|
// we trust mailgun implicitly and this is just a demo
|
|
|
|
// hence no DoS check on body size for now
|
|
|
|
body, err := ioutil.ReadAll(resp.Body)
|
|
|
|
if nil != err {
|
|
|
|
return "", err
|
|
|
|
}
|
|
|
|
if resp.StatusCode < 200 || resp.StatusCode >= 300 || "{" != string(body[0]) {
|
|
|
|
fmt.Fprintf(os.Stdout, "[Mailgun] Uh-oh...\n[Maigun] Baby Brent says: %s\n", body)
|
|
|
|
} else {
|
|
|
|
fmt.Fprintf(os.Stdout, "[Mailgun] Status: %d", resp.StatusCode)
|
|
|
|
}
|
|
|
|
|
|
|
|
return code, nil
|
2018-07-30 05:16:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
var config Conf
|
2018-07-31 05:51:46 +00:00
|
|
|
|
2018-07-22 01:52:49 +00:00
|
|
|
func main() {
|
2018-07-31 05:51:46 +00:00
|
|
|
flag.Usage = usage
|
|
|
|
port := flag.Uint("telnet-port", 0, "tcp telnet chat port")
|
|
|
|
confname := flag.String("conf", "./config.yml", "yaml config file")
|
|
|
|
flag.Parse()
|
|
|
|
|
|
|
|
confstr, err := ioutil.ReadFile(*confname)
|
|
|
|
fmt.Fprintf(os.Stdout, "-conf=%s\n", *confname)
|
|
|
|
if nil != err {
|
|
|
|
fmt.Fprintf(os.Stderr, "%s\nUsing defaults instead\n", err)
|
|
|
|
confstr = []byte("{\"port\":" + strconv.Itoa(int(*port)) + "}")
|
|
|
|
}
|
|
|
|
err = yaml.Unmarshal(confstr, &config)
|
|
|
|
if nil != err {
|
|
|
|
config = Conf{}
|
|
|
|
}
|
|
|
|
|
|
|
|
myRawConns := make(map[bufferedConn]bool)
|
|
|
|
firstMsgs = make(chan myMsg, 128)
|
|
|
|
//myRooms = make(map[string](chan myMsg))
|
|
|
|
newConns = make(chan net.Conn, 128)
|
|
|
|
authTcpChat = make(chan tcpUser, 128)
|
|
|
|
newTcpChat = make(chan bufferedConn, 128)
|
|
|
|
newHttpChat = make(chan bufferedConn, 128)
|
|
|
|
newHttpClient = make(chan bufferedConn, 128)
|
|
|
|
//myUnsortedConns = make(map[net.Conn]bool)
|
|
|
|
|
|
|
|
// TODO dynamically select on channels?
|
|
|
|
// https://stackoverflow.com/questions/19992334/how-to-listen-to-n-channels-dynamic-select-statement
|
|
|
|
//myRooms["general"] = make(chan myMsg, 128)
|
|
|
|
myMsgs = make(chan myMsg, 128)
|
|
|
|
|
|
|
|
var addr string
|
|
|
|
if 0 != int(*port) {
|
|
|
|
addr = ":" + strconv.Itoa(int(*port))
|
|
|
|
} else {
|
|
|
|
addr = ":" + strconv.Itoa(int(config.Port))
|
|
|
|
}
|
|
|
|
|
|
|
|
// https://golang.org/pkg/net/#Conn
|
|
|
|
sock, err := net.Listen("tcp", addr)
|
|
|
|
if nil != err {
|
2018-07-22 01:52:49 +00:00
|
|
|
fmt.Fprintf(os.Stderr, "Couldn't bind to TCP socket %q: %s\n", addr, err)
|
|
|
|
os.Exit(2)
|
2018-07-31 05:51:46 +00:00
|
|
|
}
|
|
|
|
fmt.Println("Listening on", addr)
|
|
|
|
|
|
|
|
go func() {
|
|
|
|
for {
|
|
|
|
conn, err := sock.Accept()
|
|
|
|
if err != nil {
|
|
|
|
// Not sure what kind of error this could be or how it could happen.
|
|
|
|
// Could a connection abort or end before it's handled?
|
|
|
|
fmt.Fprintf(os.Stderr, "Error accepting connection:\n%s\n", err)
|
|
|
|
}
|
|
|
|
newConns <- conn
|
|
|
|
}
|
|
|
|
}()
|
|
|
|
/*
|
|
|
|
server := &http.Server{
|
|
|
|
Addr: addr,
|
|
|
|
Handler: &myHandler{},
|
|
|
|
}
|
|
|
|
*/
|
|
|
|
|
|
|
|
// Main event loop handling most access to shared data
|
|
|
|
for {
|
|
|
|
select {
|
|
|
|
case conn := <-newConns:
|
|
|
|
// This is short lived
|
|
|
|
go handleConnection(conn)
|
|
|
|
case u := <-authTcpChat:
|
|
|
|
// allow to receive messages
|
|
|
|
// (and be counted among the users)
|
|
|
|
myRawConns[u.bufConn] = true
|
|
|
|
// is chan chan the right way to handle this?
|
|
|
|
u.userCount <- len(myRawConns)
|
|
|
|
myMsgs <- myMsg{
|
|
|
|
sender: nil,
|
|
|
|
// TODO fmt.Fprintf()? template?
|
|
|
|
bytes: []byte("<" + u.email + "> joined #general\n"),
|
|
|
|
receivedAt: time.Now(),
|
|
|
|
channel: "general",
|
|
|
|
email: "system",
|
|
|
|
}
|
|
|
|
case bufConn := <-newTcpChat:
|
|
|
|
go handleRaw(bufConn)
|
|
|
|
case bufConn := <-delTcpChat:
|
|
|
|
// we can safely ignore this error
|
|
|
|
bufConn.Close()
|
|
|
|
delete(myRawConns, bufConn)
|
|
|
|
case bufConn := <-newHttpChat:
|
|
|
|
go handleSorted(bufConn)
|
|
|
|
//case msg := <- myRooms["general"]:
|
|
|
|
//delete(myRooms["general"], bufConn)
|
|
|
|
//case bufConn := <-newHttpClient:
|
|
|
|
//server.Serve(bufConn)
|
|
|
|
case msg := <-myMsgs:
|
|
|
|
t := msg.receivedAt
|
|
|
|
tf := "%d-%02d-%02d %02d:%02d:%02d (%s)"
|
|
|
|
var sender string
|
|
|
|
if nil != msg.sender {
|
|
|
|
sender = msg.sender.RemoteAddr().String()
|
|
|
|
} else {
|
|
|
|
sender = "system"
|
|
|
|
}
|
|
|
|
// I wonder if we could use IP detection to get the client's tz
|
|
|
|
// ... could probably make time for this in the authentication loop
|
|
|
|
zone, _ := msg.receivedAt.Zone()
|
|
|
|
|
|
|
|
//ts, err := msg.receivedAt.MarshalJSON()
|
|
|
|
fmt.Fprintf(os.Stdout, tf+" [%s] (%s):\n\t%s",
|
|
|
|
t.Year(), t.Month(), t.Day(),
|
|
|
|
t.Hour(), t.Minute(), t.Second(), zone,
|
|
|
|
sender,
|
|
|
|
msg.email, msg.bytes)
|
|
|
|
|
|
|
|
for conn, _ := range myRawConns {
|
|
|
|
// Don't echo back to the original client
|
|
|
|
if msg.sender == conn {
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
|
|
|
|
// To ask: Why do I have to pass in conn to prevent a data race? Is it garbage collection?
|
|
|
|
// Don't block the rest of the loop
|
|
|
|
// TODO maybe use a chan to send to the socket's event loop
|
|
|
|
go func(conn bufferedConn) {
|
|
|
|
// Protect against malicious clients to prevent DoS
|
|
|
|
// https://blog.cloudflare.com/the-complete-guide-to-golang-net-http-timeouts/
|
|
|
|
timeoutDuration := 5 * time.Second
|
|
|
|
conn.SetWriteDeadline(time.Now().Add(timeoutDuration))
|
|
|
|
_, err := fmt.Fprintf(conn, tf+" [%s]: %s",
|
|
|
|
t.Year(), t.Month(), t.Day(),
|
|
|
|
t.Hour(), t.Minute(), t.Second(), zone,
|
|
|
|
msg.email, msg.bytes)
|
|
|
|
if nil != err {
|
|
|
|
delTcpChat <- conn
|
|
|
|
}
|
|
|
|
}(conn)
|
|
|
|
}
|
|
|
|
case msg := <-firstMsgs:
|
|
|
|
fmt.Fprintf(os.Stdout, "f [First Message]\n")
|
|
|
|
ts, err := msg.receivedAt.MarshalJSON()
|
|
|
|
if nil != err {
|
|
|
|
fmt.Fprintf(os.Stderr, "f [Error] %s\n", err)
|
|
|
|
}
|
|
|
|
fmt.Fprintf(os.Stdout, "f [Timestamp] %s\n", ts)
|
|
|
|
fmt.Fprintf(os.Stdout, "f [Remote] %s\n", msg.sender.RemoteAddr().String())
|
|
|
|
fmt.Fprintf(os.Stdout, "f [Message] %s\n", msg.bytes)
|
|
|
|
}
|
|
|
|
}
|
2018-07-22 01:52:49 +00:00
|
|
|
}
|