Basics of Google login are implemented

google.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"log"
+	"net/http"
+
+	"github.com/aerogo/aero"
+	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/google"
+)
+
+// EnableGoogleLogin enables Google login for the app.
+func EnableGoogleLogin(app *aero.Application) {
+	var api APIKeys
+	data, _ := ioutil.ReadFile("security/api-keys.json")
+	json.Unmarshal(data, &api)
+
+	conf := &oauth2.Config{
+		ClientID:     api.Google.ID,
+		ClientSecret: api.Google.Secret,
+		RedirectURL:  "https://beta.notify.moe/auth/google/callback",
+		Scopes: []string{
+			"https://www.googleapis.com/auth/userinfo.email",
+		},
+		Endpoint: google.Endpoint,
+	}
+
+	// Auth
+	app.Get("/auth/google", func(ctx *aero.Context) string {
+		url := conf.AuthCodeURL(ctx.Session().ID())
+		ctx.Redirect(url)
+		return ""
+	})
+
+	// Auth Callback
+	app.Get("/auth/google/callback", func(ctx *aero.Context) string {
+		if ctx.Session().ID() != ctx.Query("state") {
+			return ctx.Error(http.StatusBadRequest, "Authorization not allowed for this session", errors.New("Google login failed: Incorrect state"))
+		}
+
+		// Handle the exchange code to initiate a transport
+		token, err := conf.Exchange(oauth2.NoContext, ctx.Query("code"))
+		if err != nil {
+			return ctx.Error(http.StatusBadRequest, "Could not obtain OAuth token", err)
+		}
+
+		// Construct the OAuth client
+		client := conf.Client(oauth2.NoContext, token)
+
+		resp, err := client.Get("https://www.googleapis.com/oauth2/v3/userinfo")
+		if err != nil {
+			return ctx.Error(http.StatusBadRequest, "Failed requesting user data from Google", err)
+		}
+		defer resp.Body.Close()
+		dataBytes, _ := ioutil.ReadAll(resp.Body)
+		data := string(dataBytes)
+		log.Println("Resp body: ", data)
+
+		return ctx.Text(data)
+	})
+}