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main.go
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main.go
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package main
import (
"encoding/json"
"html/template"
"io/ioutil"
"log"
"net/http"
"os"
"github.com/gorilla/mux"
"github.com/gorilla/sessions"
"golang.org/x/oauth2"
)
const (
defaultLayout = "templates/layout.html"
templateDir = "templates/"
defaultConfigFile = "config.json"
githubAuthorizeUrl = "https://github.com/login/oauth/authorize"
githubTokenUrl = "https://github.com/login/oauth/access_token"
redirectUrl = ""
)
type Config struct {
ClientSecret string `json:"clientSecret"`
ClientID string `json:"clientID"`
ServerSecret string `json:"serverSecret"`
}
var (
cfg *Config
oauthCfg *oauth2.Config
store *sessions.CookieStore
// scopes
scopes = []string{"repo"}
tmpls = map[string]*template.Template{}
)
func loadConfig(file string) (*Config, error) {
var config Config
b, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
if err = json.Unmarshal(b, &config); err != nil {
return nil, err
}
return &config, nil
}
func main() {
tmpls["home.html"] = template.Must(template.ParseFiles(templateDir+"home.html", defaultLayout))
var err error
cfg, err = loadConfig(defaultConfigFile)
if err != nil {
log.Fatal(err)
}
store = sessions.NewCookieStore([]byte(cfg.ServerSecret))
oauthCfg = &oauth2.Config{
ClientID: cfg.ClientID,
ClientSecret: cfg.ClientSecret,
Endpoint: oauth2.Endpoint{
AuthURL: githubAuthorizeUrl,
TokenURL: githubTokenUrl,
},
RedirectURL: redirectUrl,
Scopes: scopes,
}
r := mux.NewRouter()
r.HandleFunc("/", HomeHandler)
r.HandleFunc("/start", StartHandler)
r.HandleFunc("/auth-callback", AuthCallbackHandler)
r.HandleFunc("/destroy-session", SessionDestroyHandler)
http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
http.Handle("/", r)
listenAddr := ":8080"
envPort := os.Getenv("PORT")
if len(envPort) > 0 {
listenAddr = ":" + envPort
}
log.Printf("attempting listen on %s", listenAddr)
log.Fatalln(http.ListenAndServe(listenAddr, nil))
}