fix: got error response when create token (#152)

The empty redirect_url shown in request will cause error when user
authorization url without redirect_url(it's valid case).

Also fix parse create token error response to empty error object.

authentication.go

@@ -20,7 +20,7 @@ type AuthenticationClient struct {
 //
 // See https://developers.notion.com/reference/create-a-token
 func (cc *AuthenticationClient) CreateToken(ctx context.Context, request *TokenCreateRequest) (*TokenCreateResponse, error) {
-	res, err := cc.apiClient.requestImpl(ctx, http.MethodPost, "oauth/token", nil, request, true)
+	res, err := cc.apiClient.requestImpl(ctx, http.MethodPost, "oauth/token", nil, request, true, decodeTokenCreateError)
 	if err != nil {
 		return nil, err
 	}
@@ -40,6 +40,15 @@ func (cc *AuthenticationClient) CreateToken(ctx context.Context, request *TokenC
 	return &response, nil
 }
 
+func decodeTokenCreateError(data []byte) error {
+	var apiErr TokenCreateError
+	err := json.Unmarshal(data, &apiErr)
+	if err != nil {
+		return err
+	}
+	return &apiErr
+}
+
 // TokenCreateRequest represents the request body for AuthenticationClient.CreateToken.
 type TokenCreateRequest struct {
 	// A unique random code that Notion generates to authenticate with your service,
@@ -51,7 +60,7 @@ type TokenCreateRequest struct {
 	// the integration's Authorization settings. Do not include this field if a
 	// "redirect_uri" query param was not included in the Authorization URL
 	// provided to users. In most cases, this field is required.
-	RedirectUri string `json:"redirect_uri"`
+	RedirectUri string `json:"redirect_uri,omitempty"`
 	// Required if and only when building Link Preview integrations (otherwise
 	// ignored). An object with key and name properties. key should be a unique
 	// identifier for the account. Notion uses the key to determine whether or not

authentication_test.go

@@ -17,8 +17,7 @@ func TestAuthenticationClient(t *testing.T) {
 			statusCode int
 			request    *notionapi.TokenCreateRequest
 			want       *notionapi.TokenCreateResponse
-			wantErr    bool
-			err        error
+			wantErr    error
 		}{
 			{
 				name:       "Creates token",
@@ -37,20 +36,32 @@ func TestAuthenticationClient(t *testing.T) {
 					WorkspaceId:          "workspaceid_1",
 					WorkspaceName:        "workspace_1",
 				},
-				wantErr: false,
-				err:     nil,
+				wantErr: nil,
+			},
+			{
+				name:       "Creates token",
+				filePath:   "testdata/create_token_error.json",
+				statusCode: http.StatusBadRequest,
+				request: &notionapi.TokenCreateRequest{
+					Code:        "code1",
+					GrantType:   "authorization_code",
+					RedirectUri: "www.example.com",
+				},
+				wantErr: &notionapi.TokenCreateError{
+					Code:    "invalid_grant",
+					Message: "Invalid code.",
+				},
 			},
 		}
 
 		for _, tt := range tests {
 			t.Run(tt.name, func(t *testing.T) {
 				c := newMockedClient(t, tt.filePath, tt.statusCode)
 				client := notionapi.NewClient("some_token", notionapi.WithHTTPClient(c))
-				got, err := client.Authentication.CreateToken(context.Background(), tt.request)
+				got, gotErr := client.Authentication.CreateToken(context.Background(), tt.request)
 
-				if (err != nil) != tt.wantErr {
-					t.Errorf("Query() error = %v, wantErr %v", err, tt.wantErr)
-					return
+				if !reflect.DeepEqual(gotErr, tt.wantErr) {
+					t.Errorf("Query() gotErr = %v, wantErr %v", gotErr, tt.wantErr)
 				}
 				if !reflect.DeepEqual(got, tt.want) {
 					t.Errorf("Query() got = %v, want %v", got, tt.want)

client.go

@@ -7,6 +7,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"net/http"
 	"net/url"
 	"reflect"
@@ -23,6 +24,8 @@ const (
 
 type Token string
 
+type errJsonDecodeFunc func(data []byte) error
+
 func (it Token) String() string {
 	return string(it)
 }
@@ -112,10 +115,10 @@ func WithOAuthAppCredentials(id, secret string) ClientOption {
 }
 
 func (c *Client) request(ctx context.Context, method string, urlStr string, queryParams map[string]string, requestBody interface{}) (*http.Response, error) {
-	return c.requestImpl(ctx, method, urlStr, queryParams, requestBody, false)
+	return c.requestImpl(ctx, method, urlStr, queryParams, requestBody, false, decodeClientError)
 }
 
-func (c *Client) requestImpl(ctx context.Context, method string, urlStr string, queryParams map[string]string, requestBody interface{}, basicAuth bool) (*http.Response, error) {
+func (c *Client) requestImpl(ctx context.Context, method string, urlStr string, queryParams map[string]string, requestBody interface{}, basicAuth bool, errDecoder errJsonDecodeFunc) (*http.Response, error) {
 	u, err := c.baseUrl.Parse(fmt.Sprintf("%s/%s", c.apiVersion, urlStr))
 	if err != nil {
 		return nil, err
@@ -187,18 +190,25 @@ func (c *Client) requestImpl(ctx context.Context, method string, urlStr string,
 	}
 
 	if res.StatusCode != http.StatusOK {
-		var apiErr Error
-		err = json.NewDecoder(res.Body).Decode(&apiErr)
+		data, err := ioutil.ReadAll(res.Body)
 		if err != nil {
 			return nil, err
 		}
-
-		return nil, &apiErr
+		return nil, errDecoder(data)
 	}
 
 	return res, nil
 }
 
+func decodeClientError(data []byte) error {
+	var apiErr Error
+	err := json.Unmarshal(data, &apiErr)
+	if err != nil {
+		return err
+	}
+	return &apiErr
+}
+
 type Pagination struct {
 	StartCursor Cursor
 	PageSize    int

error.go

@@ -20,3 +20,12 @@ type RateLimitedError struct {
 func (e *RateLimitedError) Error() string {
 	return e.Message
 }
+
+type TokenCreateError struct {
+	Code    ErrorCode `json:"error"`
+	Message string    `json:"error_description"`
+}
+
+func (e *TokenCreateError) Error() string {
+	return e.Message
+}

testdata/create_token_error.json

@@ -0,0 +1,4 @@
+{
+    "error": "invalid_grant",
+    "error_description": "Invalid code."
+}