forked from himidori/golang-vk-api
/
client.go
266 lines (218 loc) · 5.13 KB
/
client.go
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package vkapi
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"time"
)
const (
tokenURL = "https://oauth.vk.com/token"
apiURL = "https://api.vk.com/method/%s"
apiVersion = "5.103"
)
const (
DeviceIPhone = iota
DeviceWPhone
DeviceAndroid
)
type ratelimiter struct {
requestsCount int
lastRequestTime time.Time
}
type VKClient struct {
Self Token
Client *http.Client
rl *ratelimiter
cb *callbackHandler
}
type VKGroupBot struct {
VKClient
Group
cb *botsCallBackHandler
}
type TokenOptions struct {
ServiceToken bool
ValidateOnStart bool
}
func newVKClientBlank() *VKClient {
return &VKClient{
Client: &http.Client{},
rl: &ratelimiter{},
cb: &callbackHandler{
events: make(map[string]func(*LongPollMessage)),
},
}
}
func NewVKClient(device int, user string, password string) (*VKClient, error) {
vkclient := newVKClientBlank()
token, err := vkclient.auth(device, user, password)
if err != nil {
return nil, err
}
vkclient.Self = token
return vkclient, nil
}
func NewVKClientWithToken(token string, options *TokenOptions) (*VKClient, error) {
vkclient := newVKClientBlank()
vkclient.Self.AccessToken = token
if options != nil {
if options.ValidateOnStart {
uid, err := vkclient.requestSelfID()
if err != nil {
return nil, err
}
vkclient.Self.UID = uid
if !options.ServiceToken {
if err := vkclient.updateSelfUser(); err != nil {
return nil, err
}
}
}
}
return vkclient, nil
}
func NewVKGroupBot(token string, options *TokenOptions) (*VKGroupBot, error) {
vkclient, err := NewVKClientWithToken(token, options)
if err != nil {
return nil, err
}
resp, err := vkclient.MakeRequest("groups.getById", nil)
if err != nil {
return nil, err
}
var res []*Group
json.Unmarshal(resp.Response, &res)
return &VKGroupBot{
VKClient: *vkclient,
Group: *res[0],
cb: &botsCallBackHandler{
events: make(map[string]func(*BotsLongPollObject)),
},
}, nil
}
func (client *VKClient) updateSelfUser() error {
me, err := client.UsersGet([]int{client.Self.UID})
if err != nil {
return err
}
client.Self.FirstName = me[0].FirstName
client.Self.LastName = me[0].LastName
client.Self.PicSmall = me[0].Photo
client.Self.PicMedium = me[0].PhotoMedium
client.Self.PicBig = me[0].PhotoBig
return nil
}
func (s *ratelimiter) Wait() {
if s.requestsCount == 3 {
secs := time.Since(s.lastRequestTime).Seconds()
ms := int((1 - secs) * 1000)
if ms > 0 {
duration := time.Duration(ms * int(time.Millisecond))
//fmt.Println("attempted to make more than 3 requests per second, "+
//"sleeping for", ms, "ms")
time.Sleep(duration)
}
s.requestsCount = 0
}
}
func (s *ratelimiter) Update() {
s.requestsCount++
s.lastRequestTime = time.Now()
}
func (client *VKClient) auth(device int, user string, password string) (Token, error) {
client.rl.Wait()
req, err := http.NewRequest("GET", tokenURL, nil)
if err != nil {
return Token{}, err
}
client.rl.Update()
clientID := ""
clientSecret := ""
switch device {
case DeviceIPhone:
clientID = "3140623"
clientSecret = "VeWdmVclDCtn6ihuP1nt"
case DeviceWPhone:
clientID = "3697615"
clientSecret = "AlVXZFMUqyrnABp8ncuU"
case DeviceAndroid:
clientID = "2274003"
clientSecret = "hHbZxrka2uZ6jB1inYsH"
default:
clientID = "3140623"
clientSecret = "VeWdmVclDCtn6ihuP1nt"
}
q := req.URL.Query()
q.Add("grant_type", "password")
q.Add("client_id", clientID)
q.Add("client_secret", clientSecret)
q.Add("username", user)
q.Add("password", password)
q.Add("v", "5.40")
req.URL.RawQuery = q.Encode()
client.rl.Wait()
resp, err := client.Client.Do(req)
if err != nil {
return Token{}, err
}
client.rl.Update()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return Token{}, err
}
var token Token
json.Unmarshal(body, &token)
if token.Error != "" {
return Token{}, errors.New(token.Error + ": " + token.ErrorDescription)
}
return token, nil
}
func (client *VKClient) requestSelfID() (uid int, err error) {
resp, err := client.MakeRequest("users.get", url.Values{})
if err != nil {
return 0, err
}
rawdata, err := resp.Response.MarshalJSON()
if err != nil {
return 0, err
}
data := make([]struct {
ID int `json:"id"`
}, 1)
if err := json.Unmarshal(rawdata, &data); err != nil {
return 0, err
}
if len(data) == 0 {
return 0, nil
}
return data[0].ID, nil
}
func (client *VKClient) MakeRequest(method string, params url.Values) (APIResponse, error) {
client.rl.Wait()
endpoint := fmt.Sprintf(apiURL, method)
if params == nil {
params = url.Values{}
}
params.Set("access_token", client.Self.AccessToken)
params.Set("v", apiVersion)
resp, err := client.Client.PostForm(endpoint, params)
if err != nil {
return APIResponse{}, err
}
defer resp.Body.Close()
client.rl.Update()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return APIResponse{}, err
}
var apiresp APIResponse
json.Unmarshal(body, &apiresp)
if apiresp.ResponseError.ErrorCode != 0 {
return apiresp, errors.New("Error code: " + strconv.Itoa(apiresp.ResponseError.ErrorCode) + ", " + apiresp.ResponseError.ErrorMsg)
}
return apiresp, nil
}