Add refresh token example

Author: LyricTian

example/README.md

@@ -44,4 +44,17 @@ Open the browser [http://localhost:9094/try](http://localhost:9094/try)
   "expires_in": 7195,
   "user_id": "000000"
 }
+```
+
+## Refresh token
+
+Open the browser [http://localhost:9094/refresh](http://localhost:9094/refresh)
+
+```
+{
+  "access_token": "0IIL4_AJN2-SR0JEYZVQWG",
+  "token_type": "Bearer",
+  "refresh_token": "AG6-63MLXUEFUV2Q_BLYIW",
+  "expiry": "2019-01-09T23:03:16.374062+08:00"
+}
 ```

example/client/client.go

@@ -7,6 +7,7 @@ import (
 	"io"
 	"log"
 	"net/http"
+	"time"
 
 	"golang.org/x/oauth2"
 )
@@ -59,6 +60,25 @@ func main() {
 		e.Encode(token)
 	})
 
+	http.HandleFunc("/refresh", func(w http.ResponseWriter, r *http.Request) {
+		if globalToken == nil {
+			http.Redirect(w, r, "/", http.StatusFound)
+			return
+		}
+
+		globalToken.Expiry = time.Now()
+		token, err := config.TokenSource(context.Background(), globalToken).Token()
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		globalToken = token
+		e := json.NewEncoder(w)
+		e.SetIndent("", "  ")
+		e.Encode(token)
+	})
+
 	http.HandleFunc("/try", func(w http.ResponseWriter, r *http.Request) {
 		if globalToken == nil {
 			http.Redirect(w, r, "/", http.StatusFound)

manage/config.go

@@ -35,5 +35,5 @@ var (
 	DefaultImplicitTokenCfg      = &Config{AccessTokenExp: time.Hour * 1}
 	DefaultPasswordTokenCfg      = &Config{AccessTokenExp: time.Hour * 2, RefreshTokenExp: time.Hour * 24 * 7, IsGenerateRefresh: true}
 	DefaultClientTokenCfg        = &Config{AccessTokenExp: time.Hour * 2}
-	DefaultRefreshTokenCfg       = &RefreshingConfig{IsRemoveAccess: true, IsRemoveRefreshing: true}
+	DefaultRefreshTokenCfg       = &RefreshingConfig{IsGenerateRefresh: true, IsRemoveAccess: true, IsRemoveRefreshing: true}
 )