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// Copyright (c) 2015 Serge Gebhardt. All rights reserved.
//
// Use of this source code is governed by the ISC
// license that can be found in the LICENSE file.
package acd
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"strings"
)
const (
// LibraryVersion is the current version of this library
LibraryVersion = "0.1.0"
defaultMetadataURL = "https://drive.amazonaws.com/drive/v1/"
defaultContentURL = "https://content-na.drive.amazonaws.com/cdproxy/"
userAgent = "go-acd/" + LibraryVersion
)
// A Client manages communication with the Amazon Cloud Drive API.
type Client struct {
// HTTP client used to communicate with the API.
httpClient *http.Client
// Metadata URL for API requests. Defaults to the public Amazon Cloud Drive API.
// MetadataURL should always be specified with a trailing slash.
MetadataURL *url.URL
// Content URL for API requests. Defaults to the public Amazon Cloud Drive API.
// ContentURL should always be specified with a trailing slash.
ContentURL *url.URL
// User agent used when communicating with the API.
UserAgent string
// Services used for talking to different parts of the API.
Account *AccountService
Nodes *NodesService
}
// NewClient returns a new Amazon Cloud Drive API client. If a nil httpClient is
// provided, http.DefaultClient will be used. To use API methods which require
// authentication, provide an http.Client that will perform the authentication
// for you (such as that provided by the golang.org/x/oauth2 library).
func NewClient(httpClient *http.Client) *Client {
if httpClient == nil {
httpClient = http.DefaultClient
}
metadataURL, _ := url.Parse(defaultMetadataURL)
contentURL, _ := url.Parse(defaultContentURL)
c := &Client{
httpClient: httpClient,
MetadataURL: metadataURL,
ContentURL: contentURL,
UserAgent: userAgent,
}
c.Account = &AccountService{client: c}
c.Nodes = &NodesService{client: c}
return c
}
// NewMetadataRequest creates an API request for metadata. A relative URL can be
// provided in urlStr, in which case it is resolved relative to the MetadataURL
// of the Client. Relative URLs should always be specified without a preceding
// slash. If specified, the value pointed to by body is JSON encoded and included
// as the request body.
func (c *Client) NewMetadataRequest(method, urlStr string, body interface{}) (*http.Request, error) {
return c.newRequest(c.MetadataURL, method, urlStr, body)
}
// NewContentRequest creates an API request for content. A relative URL can be
// provided in urlStr, in which case it is resolved relative to the ContentURL
// of the Client. Relative URLs should always be specified without a preceding
// slash. If specified, the value pointed to by body is JSON encoded and included
// as the request body.
func (c *Client) NewContentRequest(method, urlStr string, body interface{}) (*http.Request, error) {
return c.newRequest(c.ContentURL, method, urlStr, body)
}
// newRequest creates an API request. A relative URL can be provided in urlStr,
// in which case it is resolved relative to base URL.
// Relative URLs should always be specified without a preceding slash. If
// specified, the value pointed to by body is JSON encoded and included as the
// request body.
func (c *Client) newRequest(base *url.URL, method, urlStr string, body interface{}) (*http.Request, error) {
rel, err := url.Parse(urlStr)
if err != nil {
return nil, err
}
u := base.ResolveReference(rel)
bodyReader, ok := body.(io.Reader)
if !ok && body != nil {
buf := &bytes.Buffer{}
err := json.NewEncoder(buf).Encode(body)
if err != nil {
return nil, err
}
bodyReader = buf
}
req, err := http.NewRequest(method, u.String(), bodyReader)
if err != nil {
return nil, err
}
// req.Header.Add("Accept", mediaTypeV3)
if c.UserAgent != "" {
req.Header.Add("User-Agent", c.UserAgent)
}
return req, nil
}
// Do sends an API request and returns the API response. The API response is
// JSON decoded and stored in the value pointed to by v, or returned as an
// error if an API error has occurred. If v implements the io.Writer
// interface, the raw response body will be written to v, without attempting to
// first decode it. If v is nil then the resp.Body won't be closed - this is
// your responsibility.
//
func (c *Client) Do(req *http.Request, v interface{}) (*http.Response, error) {
//buf, _ := httputil.DumpRequest(req, true)
//buf, _ := httputil.DumpRequest(req, false)
//log.Printf("req = %s", string(buf))
resp, err := c.httpClient.Do(req)
if err != nil {
return nil, err
}
if v != nil {
defer resp.Body.Close()
}
//buf, _ = httputil.DumpResponse(resp, true)
//buf, _ = httputil.DumpResponse(resp, false)
//log.Printf("resp = %s", string(buf))
err = CheckResponse(resp)
if err != nil {
// even though there was an error, we still return the response
// in case the caller wants to inspect it further. We do close the
// Body though
if v == nil {
resp.Body.Close()
}
return resp, err
}
if v != nil {
if w, ok := v.(io.Writer); ok {
io.Copy(w, resp.Body)
} else {
err = json.NewDecoder(resp.Body).Decode(v)
}
}
return resp, err
}
// CheckResponse checks the API response for errors, and returns them if
// present. A response is considered an error if it has a status code outside
// the 200 range.
func CheckResponse(r *http.Response) error {
c := r.StatusCode
if 200 <= c && c <= 299 {
return nil
}
errBody := ""
if data, err := ioutil.ReadAll(r.Body); err == nil {
errBody = strings.TrimSpace(string(data))
}
errMsg := fmt.Sprintf("HTTP code %v: %q: ", c, r.Status)
if errBody == "" {
errMsg += "no response body"
} else {
errMsg += fmt.Sprintf("response body: %q", errBody)
}
return errors.New(errMsg)
}
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