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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 (
"io"
"io/ioutil"
"net/http"
"net/url"
"strings"
)
//RequestOptions contains additional headers and values for a request.
type RequestOptions struct {
Values url.Values
}
func cloneRequestOptions(orig *RequestOptions) *RequestOptions {
result := RequestOptions{
Values: make(url.Values),
}
if orig != nil {
for k, v := range orig.Values {
result.Values[k] = v
}
}
return &result
}
//Request contains the parameters that can be set in a request to the Swift API.
type Request struct {
Method string //"GET", "HEAD", "PUT", "POST" or "DELETE"
ContainerName string //empty for requests on accounts
ObjectName string //empty for requests on accounts/containers
Headers http.Header
Options *RequestOptions
Body io.Reader
//ExpectStatusCodes can be left empty to disable this check, otherwise
//schwift.UnexpectedStatusCodeError may be returned.
ExpectStatusCodes []int
//DrainResponseBody can be set if the caller is not interested in the
//response body. This is implied for Response.StatusCode == 204.
DrainResponseBody bool
}
//URL returns the full URL for this request.
func (r Request) URL(client Client, values url.Values) (string, error) {
uri, err := url.Parse(client.EndpointURL())
if err != nil {
return "", err
}
if !strings.HasSuffix(uri.Path, "/") {
uri.Path += "/"
}
if r.ContainerName == "" {
if r.ObjectName != "" {
return "", ErrNoContainerName
}
} else {
if strings.Contains(r.ContainerName, "/") {
return "", ErrMalformedContainerName
}
uri.Path += r.ContainerName + "/" + r.ObjectName
}
uri.RawQuery = values.Encode()
return uri.String(), nil
}
//Do executes this request on the given Client.
func (r Request) Do(client Client) (*http.Response, error) {
//build URL
var values url.Values
if r.Options != nil {
values = r.Options.Values
}
uri, err := r.URL(client, values)
if err != nil {
return nil, err
}
//build request
req, err := http.NewRequest(r.Method, uri, r.Body)
if err != nil {
return nil, err
}
for k, v := range r.Headers {
req.Header[k] = v
}
if r.Body != nil {
req.Header.Set("Expect", "100-continue")
}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
//return success if error code matches expectation
if len(r.ExpectStatusCodes) == 0 {
//check disabled -> return response unaltered
return resp, nil
}
for _, code := range r.ExpectStatusCodes {
if code == resp.StatusCode {
var err error
if r.DrainResponseBody || resp.StatusCode == 204 {
err = drainResponseBody(resp)
}
return resp, err
}
}
//unexpected status code -> generate error
buf, err := collectResponseBody(resp)
if err != nil {
return nil, err
}
return nil, UnexpectedStatusCodeError{
ExpectedStatusCodes: r.ExpectStatusCodes,
ActualResponse: resp,
ResponseBody: buf,
}
}
func drainResponseBody(r *http.Response) error {
_, err := io.Copy(ioutil.Discard, r.Body)
if err != nil {
return err
}
return r.Body.Close()
}
func collectResponseBody(r *http.Response) ([]byte, error) {
buf, err := ioutil.ReadAll(r.Body)
if err != nil {
return nil, err
}
return buf, r.Body.Close()
}
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