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/******************************************************************************
*
* Copyright 2018 Stefan Majewsky <majewsky@gmx.net>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
package schwift
import (
"net/http"
"github.com/gophercloud/gophercloud"
)
//Client is the interface between Schwift and the libraries providing
//authentication for it. Schwift can wrap gophercloud.ServiceClient to provide
//this interface, so if you have a gophercloud.ServiceClient, use the
//AccountFromGophercloud method to obtain the corresponding schwift.Account
//instance.
type Client interface {
//EndpointURL returns the endpoint URL from the Keystone catalog for the
//Swift account that this client operates on. It should look like
//`http://domain.tld/v1/AUTH_projectid/`.
EndpointURL() string
//Clone returns a deep clone of this client with the endpoint URL changed to
//the given URL.
Clone(newEndpointURL string) Client
//Do executes the given request after adding to it the X-Auth-Token header
//containing the client's current Keystone (or Swift auth) token. It may
//also set other headers, such as User-Agent. If the status code returned is
//401, it shall attempt to acquire a new auth token and restart the request
//with the new token.
Do(req *http.Request) (*http.Response, error)
}
type gophercloudClient struct {
c *gophercloud.ServiceClient
}
func (g *gophercloudClient) EndpointURL() string {
return g.c.Endpoint
}
func (g *gophercloudClient) Clone(newEndpointURL string) Client {
clonedClient := *g.c
clonedClient.Endpoint = newEndpointURL
return &gophercloudClient{&clonedClient}
}
func (g *gophercloudClient) Do(req *http.Request) (*http.Response, error) {
return g.do(req, false)
}
func (g *gophercloudClient) do(req *http.Request, afterReauth bool) (*http.Response, error) {
provider := g.c.ProviderClient
req.Header.Set("User-Agent", provider.UserAgent.Join())
for key, value := range provider.AuthenticatedHeaders() {
req.Header.Set(key, value)
}
resp, err := provider.HTTPClient.Do(req)
if err != nil {
return nil, err
}
//detect expired token
if resp.StatusCode == http.StatusUnauthorized && !afterReauth {
err := drainResponseBody(resp)
if err != nil {
return nil, err
}
err = provider.Reauthenticate(resp.Request.Header.Get("X-Auth-Token"))
if err != nil {
return nil, err
}
//restart request with new token
return g.do(req, true)
}
return resp, nil
}
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