From d7b35f05a5f64a167224369762aa4bd2b297686a Mon Sep 17 00:00:00 2001
From: Gregory Eremin <g@erem.in>
Date: Thu, 5 Mar 2015 14:46:19 +0700
Subject: [PATCH] Server auth draft

---
 server/auth.go   | 58 ++++++++++++++++++++++++++++++++++++++++++++++++
 server/server.go | 11 +++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 server/auth.go
 create mode 100644 server/server.go

diff --git a/server/auth.go b/server/auth.go
new file mode 100644
index 0000000..060a015
--- /dev/null
+++ b/server/auth.go
@@ -0,0 +1,58 @@
+package server
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+
+	"github.com/localhots/steward/config"
+)
+
+const (
+	authURL        = "https://github.com/login/oauth/authorize"
+	accessTokenURL = "https://github.com/login/oauth/access_token"
+)
+
+func authSigninHandler(w http.ResponseWriter, r *http.Request) {
+	params := url.Values{}
+	params.Set("client_id", config.C().ClientID)
+	params.Set("redirect_uri", config.C().RedirectURI)
+	params.Set("scope", "repo")
+	http.Redirect(w, r, authURL+"?"+params.Encode(), 302)
+}
+
+func authCallbackHandler(w http.ResponseWriter, r *http.Request) {
+	if r.FormValue("error") != "" {
+		w.Write([]byte(r.FormValue("error_description")))
+	} else {
+		fmt.Println("Got code: ", r.FormValue("code"))
+		token := getAccessToken(r.FormValue("code"))
+		fmt.Println("Got access token: ", token)
+		w.Write([]byte(token))
+	}
+}
+
+func getAccessToken(code string) string {
+	payload := url.Values{}
+	payload.Set("client_id", config.C().ClientID)
+	payload.Set("client_secret", config.C().ClientSecret)
+	payload.Set("code", code)
+	payload.Set("redirect_uri", config.C().RedirectURI)
+
+	buf := bytes.NewBuffer([]byte(payload.Encode()))
+	resp, err := http.Post(accessTokenURL, "application/x-www-form-urlencoded", buf)
+	if err != nil {
+		panic(err)
+	}
+
+	defer resp.Body.Close()
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		panic(err)
+	}
+
+	pairs, _ := url.ParseQuery(string(body))
+	return pairs.Get("access_token")
+}
diff --git a/server/server.go b/server/server.go
new file mode 100644
index 0000000..d33fc9d
--- /dev/null
+++ b/server/server.go
@@ -0,0 +1,11 @@
+package server
+
+import (
+	"net/http"
+)
+
+func Start() {
+	http.HandleFunc("/auth/signin", authSigninHandler)
+	http.HandleFunc("/auth/callback", authCallbackHandler)
+	http.ListenAndServe(":8080", nil)
+}