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client.go
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client.go
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package lkdr
import (
"bytes"
"context"
"encoding/json"
"net/http"
"time"
"github.com/jfk9w-go/based"
"github.com/pkg/errors"
)
const (
baseURL = "https://mco.nalog.ru/api"
expireTokenOffset = 5 * time.Minute
captchaSiteKey = "hfU4TD7fJUI7XcP5qRphKWgnIR5t9gXAxTRqdQJk"
captchaPageURL = "https://lkdr.nalog.ru/login"
)
type TokenStorage interface {
LoadTokens(ctx context.Context, phone string) (*Tokens, error)
UpdateTokens(ctx context.Context, phone string, tokens *Tokens) error
}
type ClientParams struct {
Phone string `validate:"required"`
Clock based.Clock `validate:"required"`
DeviceID string `validate:"required"`
UserAgent string `validate:"required"`
TokenStorage TokenStorage `validate:"required"`
Transport http.RoundTripper
}
func NewClient(params ClientParams) (*Client, error) {
if err := based.Validate(params); err != nil {
return nil, err
}
return &Client{
clock: params.Clock,
phone: params.Phone,
deviceInfo: deviceInfo{
SourceType: "WEB",
SourceDeviceId: params.DeviceID,
MetaDetails: metaDetails{
UserAgent: params.UserAgent,
},
AppVersion: "1.0.0",
},
httpClient: &http.Client{
Transport: params.Transport,
},
token: based.NewWriteThroughCached[string, *Tokens](
based.WriteThroughCacheStorageFunc[string, *Tokens]{
LoadFn: params.TokenStorage.LoadTokens,
UpdateFn: params.TokenStorage.UpdateTokens,
},
params.Phone,
),
mu: based.Semaphore(params.Clock, 20, time.Minute),
}, nil
}
type Client struct {
clock based.Clock
phone string
deviceInfo deviceInfo
httpClient *http.Client
token *based.WriteThroughCached[*Tokens]
mu based.Locker
}
func (c *Client) Receipt(ctx context.Context, in *ReceiptIn) (*ReceiptOut, error) {
return execute(ctx, c, in)
}
func (c *Client) FiscalData(ctx context.Context, in *FiscalDataIn) (*FiscalDataOut, error) {
return execute(ctx, c, in)
}
func (c *Client) ensureToken(ctx context.Context) (string, error) {
tokens, err := c.token.Get(ctx)
if err != nil {
return "", errors.Wrap(err, "load token")
}
now := c.clock.Now()
updateToken := true
if tokens == nil || tokens.RefreshTokenExpiresIn != nil && tokens.RefreshTokenExpiresIn.Time().Before(now.Add(expireTokenOffset)) {
tokens, err = c.authorize(ctx)
if err != nil {
return "", errors.Wrap(err, "authorize")
}
} else if tokens.TokenExpireIn.Time().Before(now.Add(expireTokenOffset)) {
tokens, err = c.refreshToken(ctx, tokens.RefreshToken)
if err != nil {
return "", errors.Wrap(err, "refresh token")
}
} else {
updateToken = false
}
if updateToken {
if err := c.token.Update(ctx, tokens); err != nil {
return "", errors.Wrap(err, "update token")
}
}
return tokens.Token, nil
}
func (c *Client) authorize(ctx context.Context) (*Tokens, error) {
authorizer := getAuthorizer(ctx)
if authorizer == nil {
return nil, errors.New("authorizer is required, but not set")
}
captchaToken, err := authorizer.GetCaptchaToken(ctx, c.deviceInfo.MetaDetails.UserAgent, captchaSiteKey, captchaPageURL)
if err != nil {
return nil, errors.Wrap(err, "get captcha token")
}
startIn := &startIn{
DeviceInfo: c.deviceInfo,
Phone: c.phone,
CaptchaToken: captchaToken,
}
startOut, err := execute(ctx, c, startIn)
if err != nil {
var clientErr Error
if !errors.As(err, &clientErr) || clientErr.Code != SmsVerificationNotExpired {
return nil, errors.Wrap(err, "start sms challenge")
}
}
code, err := authorizer.GetConfirmationCode(ctx, c.phone)
if err != nil {
return nil, errors.Wrap(err, "get confirmation code")
}
verifyIn := &verifyIn{
DeviceInfo: c.deviceInfo,
Phone: c.phone,
ChallengeToken: startOut.ChallengeToken,
Code: code,
}
tokens, err := execute(ctx, c, verifyIn)
if err != nil {
return nil, errors.Wrap(err, "verify code")
}
return tokens, nil
}
func (c *Client) refreshToken(ctx context.Context, refreshToken string) (*Tokens, error) {
in := &tokenIn{
DeviceInfo: c.deviceInfo,
RefreshToken: refreshToken,
}
return execute[Tokens](ctx, c, in)
}
func execute[R any](ctx context.Context, c *Client, in exchange[R]) (*R, error) {
var token string
if in.auth() {
var (
cancel context.CancelFunc
err error
)
ctx, cancel = c.mu.Lock(ctx)
defer cancel()
if err := ctx.Err(); err != nil {
return nil, err
}
token, err = c.ensureToken(ctx)
if err != nil {
return nil, err
}
}
reqBody, err := json.Marshal(in)
if err != nil {
return nil, errors.Wrap(err, "marshal json body")
}
httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, baseURL+in.path(), bytes.NewReader(reqBody))
if err != nil {
return nil, errors.Wrap(err, "create request")
}
httpReq.Header.Set("Content-Type", "application/json;charset=UTF-8")
if token != "" {
httpReq.Header.Set("Authorization", "Bearer "+token)
}
httpResp, err := c.httpClient.Do(httpReq)
if err != nil {
return nil, errors.Wrap(err, "execute request")
}
if httpResp.Body == nil {
return nil, errors.New(httpResp.Status)
}
defer httpResp.Body.Close()
if httpResp.StatusCode != http.StatusOK {
var clientErr Error
if err := json.NewDecoder(httpResp.Body).Decode(&clientErr); err == nil {
return nil, clientErr
}
return nil, errors.New(httpResp.Status)
}
var out R
if err := json.NewDecoder(httpResp.Body).Decode(&out); err != nil {
return nil, errors.Wrap(err, "decode response body")
}
return &out, nil
}