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main.go
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package main
import (
"os"
"fmt"
"log"
"regexp"
"net/http"
"github.com/nlopes/slack"
)
var port string
var slackToken string
var teamName string
var firstName string = "Super"
var lastName string = "Man"
var api *slack.Client
var inviteTmpl string = `
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="keyword" content="Slack, letmein, let me in">
<meta name="description" content="Slack, let me in. A Slack inviter">
<meta name="author" content="minhnd.com">
<title>Slack, let me in!</title>
<link href="http://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.6/css/materialize.min.css">
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
</head>
<body>
<div class="container">
<div class="section">
<div class="row">
<div class="col s12 center cyan-text darken-4-text">
<h3 class="header">Slack, let me in</h3>
</div>
</div>
%s
<div class="row">
<div class="col s6 offset-s3">
<form method="POST" action="/">
<div class="input-field">
<i class="material-icons prefix">email</i>
<input id="email" name="email" type="text">
<label for="email">Enter your email</label>
</div>
<button class="btn waves-effect waves-light red darken-2 right" type="submit" name="action">Next
<i class="material-icons right">send</i>
</button>
</form>
</div>
</div>
</div>
</div>
<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.6/js/materialize.min.js"></script>
<script src='https://www.google.com/recaptcha/api.js'></script>
</body>
</html>
`
var successMessage string = `
<div class="row">
<div class="col s6 offset-s3">
<div class="card light-blue darken-3">
<div class="card-content white-text">
<p>
Invitation already sent, check your email!
</p>
</div>
</div>
</div>
</div>
`
var errorMessage string = `
<div class="row">
<div class="col s6 offset-s3">
<div class="card red darken-3">
<div class="card-content white-text">
<p>
%s
</p>
</div>
</div>
</div>
</div>
`
var errorEmail string = "Please enter a valid email"
func inviteHandler(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
fmt.Fprintf(w, fmt.Sprintf(inviteTmpl, ""))
return
}
r.ParseForm()
email := r.Form.Get("email")
var validEmail = regexp.MustCompile(`^\w[-._\w]*\w@\w[-._\w]*\w\.\w{2,3}$`)
if !validEmail.MatchString(email) {
msg := fmt.Sprintf(errorMessage, errorEmail)
fmt.Fprintf(w, fmt.Sprintf(inviteTmpl, msg))
return
}
err := api.InviteToTeam(teamName, firstName, lastName, email)
if err != nil {
log.Println(err.Error())
msg := fmt.Sprintf(errorMessage, err.Error())
fmt.Fprintf(w, fmt.Sprintf(inviteTmpl, msg))
return
}
fmt.Fprintf(w, fmt.Sprintf(inviteTmpl, successMessage))
}
func init() {
port = os.Getenv("PORT")
slackToken = os.Getenv("SLACK_TOKEN")
teamName = os.Getenv("TEAM_NAME")
if (port=="") || (slackToken=="") || (teamName=="") {
log.Fatal("You must set all environment variables: PORT, SLACK_TOKEN, TEAM_NAME")
}
if os.Getenv("FIRST_NAME") != "" {firstName = os.Getenv("FIRST_NAME")}
if os.Getenv("LAST_NAME") != "" {lastName = os.Getenv("LAST_NAME")}
}
func main() {
api = slack.New(slackToken)
http.HandleFunc("/", inviteHandler)
log.Fatal(http.ListenAndServe(":"+port, nil))
}