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|
package common
import (
"bytes"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"strings"
)
type HTTPClient struct {
httpClient http.Client
endpoint string
apikey string
username string
password string
id string
csrf string
conf HTTPClientConfig
}
type HTTPClientConfig struct {
URLPrefix string
HeaderAPIKeyName string
Apikey string
HeaderClientKeyName string
CsrfDisable bool
}
// Inspired by syncthing/cmd/cli
const insecure = false
// HTTPNewClient creates a new HTTP client to deal with Syncthing
func HTTPNewClient(baseURL string, cfg HTTPClientConfig) (*HTTPClient, error) {
// Create w new Http client
httpClient := http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: insecure,
},
},
}
client := HTTPClient{
httpClient: httpClient,
endpoint: baseURL,
apikey: cfg.Apikey,
conf: cfg,
/* TODO - add user + pwd support
username: c.GlobalString("username"),
password: c.GlobalString("password"),
*/
}
if client.apikey == "" {
if err := client.getCidAndCsrf(); err != nil {
return nil, err
}
}
return &client, nil
}
// Send request to retrieve Client id and/or CSRF token
func (c *HTTPClient) getCidAndCsrf() error {
request, err := http.NewRequest("GET", c.endpoint, nil)
if err != nil {
return err
}
if _, err := c.handleRequest(request); err != nil {
return err
}
if c.id == "" {
return errors.New("Failed to get device ID")
}
if !c.conf.CsrfDisable && c.csrf == "" {
return errors.New("Failed to get CSRF token")
}
return nil
}
// GetClientID returns the id
func (c *HTTPClient) GetClientID() string {
return c.id
}
// formatURL Build full url by concatenating all parts
func (c *HTTPClient) formatURL(endURL string) string {
url := c.endpoint
if !strings.HasSuffix(url, "/") {
url += "/"
}
url += strings.TrimLeft(c.conf.URLPrefix, "/")
if !strings.HasSuffix(url, "/") {
url += "/"
}
return url + strings.TrimLeft(endURL, "/")
}
// HTTPGet Send a Get request to client and return an error object
func (c *HTTPClient) HTTPGet(url string, data *[]byte) error {
_, err := c.HTTPGetWithRes(url, data)
return err
}
// HTTPGetWithRes Send a Get request to client and return both response and error
func (c *HTTPClient) HTTPGetWithRes(url string, data *[]byte) (*http.Response, error) {
request, err := http.NewRequest("GET", c.formatURL(url), nil)
if err != nil {
return nil, err
}
res, err := c.handleRequest(request)
if err != nil {
return res, err
}
if res.StatusCode != 200 {
return res, errors.New(res.Status)
}
*data = c.responseToBArray(res)
return res, nil
}
// HTTPPost Send a POST request to client and return an error object
func (c *HTTPClient) HTTPPost(url string, body string) error {
_, err := c.HTTPPostWithRes(url, body)
return err
}
// HTTPPostWithRes Send a POST request to client and return both response and error
func (c *HTTPClient) HTTPPostWithRes(url string, body string) (*http.Response, error) {
request, err := http.NewRequest("POST", c.formatURL(url), bytes.NewBufferString(body))
if err != nil {
return nil, err
}
res, err := c.handleRequest(request)
if err != nil {
return res, err
}
if res.StatusCode != 200 {
return res, errors.New(res.Status)
}
return res, nil
}
func (c *HTTPClient) responseToBArray(response *http.Response) []byte {
defer response.Body.Close()
bytes, err := ioutil.ReadAll(response.Body)
if err != nil {
// TODO improved error reporting
fmt.Println("ERROR: " + err.Error())
}
return bytes
}
func (c *HTTPClient) handleRequest(request *http.Request) (*http.Response, error) {
if c.conf.HeaderAPIKeyName != "" && c.apikey != "" {
request.Header.Set(c.conf.HeaderAPIKeyName, c.apikey)
}
if c.conf.HeaderClientKeyName != "" && c.id != "" {
request.Header.Set(c.conf.HeaderClientKeyName, c.id)
}
if c.username != "" || c.password != "" {
request.SetBasicAuth(c.username, c.password)
}
if c.csrf != "" {
request.Header.Set("X-CSRF-Token-"+c.id[:5], c.csrf)
}
response, err := c.httpClient.Do(request)
if err != nil {
return nil, err
}
// Detect client ID change
cid := response.Header.Get(c.conf.HeaderClientKeyName)
if cid != "" && c.id != cid {
c.id = cid
}
// Detect CSR token change
for _, item := range response.Cookies() {
if item.Name == "CSRF-Token-"+c.id[:5] {
c.csrf = item.Value
goto csrffound
}
}
// OK CSRF found
csrffound:
if response.StatusCode == 404 {
return nil, errors.New("Invalid endpoint or API call")
} else if response.StatusCode == 401 {
return nil, errors.New("Invalid username or password")
} else if response.StatusCode == 403 {
if c.apikey == "" {
// Request a new Csrf for next requests
c.getCidAndCsrf()
return nil, errors.New("Invalid CSRF token")
}
return nil, errors.New("Invalid API key")
} else if response.StatusCode != 200 {
data := make(map[string]interface{})
// Try to decode error field of APIError struct
json.Unmarshal(c.responseToBArray(response), &data)
if err, found := data["error"]; found {
return nil, fmt.Errorf(err.(string))
} else {
body := strings.TrimSpace(string(c.responseToBArray(response)))
if body != "" {
return nil, fmt.Errorf(body)
}
}
return nil, errors.New("Unknown HTTP status returned: " + response.Status)
}
return response, nil
}
|
