add oauth flow routes

route/auth/google.go

@@ -0,0 +1,71 @@
+package auth
+
+import (
+	"fmt"
+	"go-cal/pkg/apis/google"
+	"go-cal/pkg/config"
+	"go-cal/pkg/storage"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+// RedirectToAuth url
+func RedirectToAuth(c *gin.Context) {
+	conf := config.Get()
+	if conf == nil {
+		c.AbortWithStatus(http.StatusInternalServerError)
+		return
+	}
+
+	u, err := url.Parse(conf.Google.AuthURL)
+	if err != nil {
+		c.AbortWithError(http.StatusInternalServerError, err)
+		return
+	}
+	_ = u
+
+	qs := url.Values{}
+	qs.Set("client_id", conf.Google.ClientID)
+	qs.Set("redirect_uri", conf.Google.RedirectURL)
+	qs.Set("scope", strings.Join(conf.Google.Scopes, " "))
+	qs.Set("access_type", "offline")
+	qs.Set("response_type", "code")
+
+	targetURL := u.String() + "?" + qs.Encode()
+	c.Redirect(http.StatusTemporaryRedirect, targetURL)
+}
+
+// OAuthResponse -
+func OAuthResponse(c *gin.Context) {
+	if respError := c.Query("error"); len(respError) > 0 {
+		c.AbortWithError(http.StatusOK, fmt.Errorf("Get error : %s", respError))
+		return
+	}
+	code := c.Query("code")
+	if len(code) == 0 {
+		c.AbortWithError(http.StatusOK, fmt.Errorf("Get response code fail"))
+		return
+	}
+
+	token, err := google.OAuthExchangeCodeToToken(code)
+	if err != nil {
+		c.AbortWithError(http.StatusInternalServerError, err)
+		return
+	}
+
+	t := time.Now().Unix()
+	token.ExpiresIn += t
+
+	st := storage.Get()
+	if st == nil {
+		c.AbortWithError(http.StatusInternalServerError, fmt.Errorf("storage object not init"))
+		return
+	}
+	st.Set("google_token", token)
+
+	c.Redirect(http.StatusTemporaryRedirect, "/")
+}

route/routes/routes.go

@@ -0,0 +1,29 @@
+package routes
+
+import (
+	"go-cal/route/auth"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+// NewEngine -
+func NewEngine() *gin.Engine {
+	e := gin.New()
+
+	e.Use(gin.Logger())
+	e.Use(gin.Recovery())
+
+	return e
+}
+
+// SetRoutes -
+func SetRoutes(e *gin.Engine) {
+	e.GET("/health", func(c *gin.Context) {
+		c.String(http.StatusOK, "ok")
+	})
+
+	e.GET("/auth", auth.RedirectToAuth)
+
+	e.GET("/auth/verify", auth.OAuthResponse)
+}