forked from tj/go-dropbox
/
client.go
228 lines (193 loc) · 5.23 KB
/
client.go
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package dropbox
import (
"fmt"
"bytes"
"encoding/json"
"io"
"io/ioutil"
"net/http"
"strconv"
"strings"
"time"
"log"
"sync"
"golang.org/x/oauth2"
)
// Client implements a Dropbox client. You may use the Files and Users
// clients directly if preferred, however Client exposes them both.
type Client struct {
*Config
Users *Users
Files *Files
Sharing *Sharing
Token oauth2.Token
TokenLock sync.Mutex
}
// New client.
func New(config *Config) *Client {
c := &Client{Config: config}
c.Users = &Users{c}
c.Files = &Files{c}
c.Sharing = &Sharing{c}
return c
}
// call rpc style endpoint.
func (c *Client) call(path string, in interface{}) (io.ReadCloser, error) {
var err error
if c.AccessToken == "" && c.RefreshToken != "" {
err = c.refreshToken()
if err != nil {
return nil, err
}
}
url := "https://api.dropboxapi.com/2" + path
body, err := json.Marshal(in)
if err != nil {
return nil, err
}
reader := bytes.NewReader(body)
req, err := http.NewRequest("POST", url, reader)
if err != nil {
return nil, err
}
req.Header.Set("Authorization", "Bearer "+c.AccessToken)
req.Header.Set("Content-Type", "application/json")
r, _, err := c.do(req, reader)
return r, err
}
// download style endpoint.
func (c *Client) download(path string, in interface{}, r io.ReadSeeker, contentLength int64) (io.ReadCloser, int64, error) {
url := "https://content.dropboxapi.com/2" + path
body, err := json.Marshal(in)
if err != nil {
return nil, 0, err
}
req, err := http.NewRequest("POST", url, r)
if err != nil {
return nil, 0, err
}
req.Header.Set("Authorization", "Bearer "+c.AccessToken)
req.Header.Set("Dropbox-API-Arg", string(body))
if contentLength != 0 {
req.ContentLength = contentLength
}
if r != nil {
req.Header.Set("Content-Type", "application/octet-stream")
}
return c.do(req, r)
}
// perform the request.
func (c *Client) do(req *http.Request, seeker io.Seeker) (io.ReadCloser, int64, error) {
var err error
var res *http.Response
error_retry_time := 0.5
request_loop:
for error_retry_time < 300 {
if res != nil && err == nil {
// be sure to close the response before retrying
ioutil.ReadAll(res.Body)
res.Body.Close()
}
res, err = c.HTTPClient.Do(req)
if err != nil {
log.Printf("[DROPBOX_RETRY] %v; retrying after %.2f seconds", err, error_retry_time)
time.Sleep(time.Duration(error_retry_time) * time.Second)
error_retry_time *= 1.5
if seeker != nil {
seeker.Seek(0, io.SeekStart)
}
continue
}
switch {
case res.StatusCode == 429:
sleep_time, conv_e := strconv.Atoi(res.Header.Get("Retry-After"))
if conv_e != nil {
sleep_time = 60
}
log.Printf("[DROPBOX_RETRY] %s %s returned %d; retrying after %d seconds", req.Method, req.URL, res.StatusCode, sleep_time)
time.Sleep(time.Duration(sleep_time) * time.Second)
if seeker != nil {
seeker.Seek(0, io.SeekStart)
}
case res.StatusCode == 401:
log.Printf("[DROPBOX_RETRY] %s %s returned %d; refreshing access token", req.Method, req.URL, res.StatusCode)
err = c.refreshToken()
req.Header.Set("Authorization", "Bearer "+c.AccessToken)
if err != nil {
log.Printf("[DROPBOX_RETRY] %s returned an error: %v", c.RefreshURL, err)
time.Sleep(time.Duration(error_retry_time) * time.Second)
error_retry_time *= 1.5
}
if seeker != nil {
seeker.Seek(0, io.SeekStart)
}
case res.StatusCode >= 500: // Retry on 5xx
log.Printf("[DROPBOX_RETRY] %s %s returned %d; retrying after %.2f seconds", req.Method, req.URL, res.StatusCode, error_retry_time)
time.Sleep(time.Duration(error_retry_time) * time.Second)
error_retry_time *= 1.5
if seeker != nil {
seeker.Seek(0, io.SeekStart)
}
default:
break request_loop
}
}
if err != nil {
return nil, 0, err
}
if res.StatusCode < 400 {
return res.Body, res.ContentLength, err
}
defer res.Body.Close()
e := &Error{
Status: http.StatusText(res.StatusCode),
StatusCode: res.StatusCode,
}
kind := res.Header.Get("Content-Type")
if strings.Contains(kind, "text/plain") {
if b, err := ioutil.ReadAll(res.Body); err == nil {
e.Summary = string(b)
return nil, 0, e
} else {
return nil, 0, err
}
}
if err := json.NewDecoder(res.Body).Decode(e); err != nil {
return nil, 0, err
}
return nil, 0, e
}
func (client *Client) refreshToken() (err error) {
if client.RefreshToken == "" {
return fmt.Errorf("No refresh token provided")
}
client.TokenLock.Lock()
defer client.TokenLock.Unlock()
if client.Token.Valid() {
return nil
}
client.Token.AccessToken = ""
client.Token.RefreshToken = client.RefreshToken
body, err := json.Marshal(client.Token)
if err != nil {
return err
}
request, err := http.NewRequest("POST", client.RefreshURL, bytes.NewReader(body))
if err != nil {
return err
}
request.Header.Set("Content-Type", "application/json")
response, err := client.HTTPClient.Do(request)
if err != nil {
return fmt.Errorf("failed to refresh the access token: %v", err)
}
defer response.Body.Close()
if err = json.NewDecoder(response.Body).Decode(&client.Token); err != nil {
return err
}
if client.Token.AccessToken == "" {
return fmt.Errorf("No access token returned")
}
client.AccessToken = client.Token.AccessToken
return nil
}