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rpc.go
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rpc.go
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package rpc
import (
"bytes"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
"time"
log "github.com/Sirupsen/logrus"
)
const (
rpcID = 99
rpcURI = "/cgi-bin/luci/rpc/"
)
var (
ErrRpcLoginFail = errors.New("rpc: login fail")
ErrHttpUnauthorized = errors.New("http: Unauthorized")
ErrHttpForbidden = errors.New("http: Forbidden")
defaultTimeout = 15
)
type Auth struct {
Username string
Password string
Timeout int
}
type RpcServer struct {
Hostname string
Port int
SSL bool
}
type Client struct {
rpcServer *RpcServer
auth *Auth
token string
id int
httpClient *http.Client
}
type Payload struct {
ID int `json:"id"`
Method string `json:"method"`
Params []string `json:"params"`
}
type Response struct {
ID int `json:"id"`
Result interface{} `json:"result"`
Error *string `json:"error"`
}
func New(rpcServer *RpcServer, auth *Auth) (*Client, error) {
if auth.Timeout == 0 {
auth.Timeout = defaultTimeout
}
client := &Client{
rpcServer: rpcServer,
auth: auth,
id: rpcID,
}
client.httpClient = &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
Dial: (&net.Dialer{
Timeout: time.Duration(auth.Timeout) * time.Second,
KeepAlive: time.Duration(auth.Timeout) * time.Second,
}).Dial,
},
}
err := client.login()
if err != nil {
return nil, err
}
return client, err
}
func (c *Client) httpError(code int) error {
if code == 401 {
return ErrHttpUnauthorized
} else if code == 403 {
return ErrHttpForbidden
} else {
return errors.New(fmt.Sprintf("HTTP status code: %d", code))
}
}
func (c *Client) call(url string, postBody []byte) ([]byte, error) {
var respBody []byte
body := bytes.NewReader(postBody)
req, err := http.NewRequest("POST", url, body)
if err != nil {
return respBody, err
}
req.Header.Set("Content-Type", "application/json")
resp, err := c.httpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
respBody, err = ioutil.ReadAll(resp.Body)
if resp.StatusCode > 226 {
return respBody, c.httpError(resp.StatusCode)
}
return respBody, err
}
func (c *Client) url(uri string) string {
proto := "http://"
port := ""
if c.rpcServer.SSL == true {
proto = "https://"
}
if c.rpcServer.Port != 0 && c.rpcServer.Port != 443 {
port = fmt.Sprintf(":%d", c.rpcServer.Port)
}
url := proto + c.rpcServer.Hostname + port + rpcURI + uri
if uri != "auth" && c.token != "" {
url = url + "?auth=" + c.token
}
return url
}
func (c *Client) rpc(library, method string, params []string) (string, error) {
var response Response
var result string
if library != "auth" && c.token == "" {
return "", errors.New("RPC client is not authenticated")
}
payload := Payload{
ID: c.id,
Method: method,
Params: params,
}
data, err := json.Marshal(payload)
if err != nil {
return "", err
}
url := c.url(library)
respBody, err := c.call(url, data)
// Session timeout or OpenWrt reboot
if err == ErrHttpUnauthorized || err == ErrHttpForbidden {
log.Warn("Login again")
c.login()
url = c.url(library)
respBody, err = c.call(url, data)
}
if err != nil {
return "", err
}
if err := json.Unmarshal(respBody, &response); err != nil {
return "", err
}
if response.Error != nil {
return "", errors.New(fmt.Sprintf("%s", *response.Error))
}
if _, ok := response.Result.(string); ok == true {
result = fmt.Sprintf("%v", response.Result)
return result, nil
}
jsonBytes, err := json.Marshal(response.Result)
if err == nil {
result = string(jsonBytes)
}
return result, err
}
func (c *Client) login() error {
var token string
token, err := c.rpc("auth", "login", []string{c.auth.Username, c.auth.Password})
if err != nil {
log.Error(err)
return err
}
// OpenWRT JSON RPC response of wrong username and password
// {"id":1,"result":null,"error":null}
if token == "null" {
return ErrRpcLoginFail
}
c.token = token
return err
}
func (c *Client) SysRPC(method string, params []string) (string, error) {
return c.rpc("sys", method, params)
}
func (c *Client) UciRPC(method string, params []string) (string, error) {
return c.rpc("uci", method, params)
}
func (c *Client) FsRPC(method string, params []string) (string, error) {
return c.rpc("fs", method, params)
}