135 lines
3.4 KiB
Go
135 lines
3.4 KiB
Go
package questrade
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"strconv"
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"time"
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)
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const loginServerURL = "https://login.questrade.com/oauth2/"
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type LoginCredentials struct {
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AccessToken string `json:"access_token"`
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TokenType string `json:"token_type"`
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ExpiresIn int `json:"expires_in"`
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RefreshToken string `json:"refresh_token"`
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ApiServer string `json:"api_server"`
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}
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// A client is the structure that will be used to consume the API
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// endpoints. It holds the login credentials, http client/transport,
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// rate limit information, and the login session timer.
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type client struct {
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Credentials LoginCredentials
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SessionTimer *time.Timer
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RateLimitRemaining int
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RateLimitReset time.Time
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httpClient *http.Client
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transport *http.Transport
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}
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// authHeader is a shortcut that returns a string to be placed
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// in the authorization header of API calls
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func (l LoginCredentials) authHeader() string {
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return l.TokenType + " " + l.AccessToken
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}
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// Send an HTTP GET request, and return the processed response
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func (c *client) get(endpoint string, out interface{}, query url.Values) error {
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req, err := http.NewRequest("GET", c.Credentials.ApiServer+endpoint+query.Encode(), nil)
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if err != nil {
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return err
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}
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req.Header.Add("Authorization", c.Credentials.authHeader())
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res, err := c.httpClient.Do(req)
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if err != nil {
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return fmt.Errorf("http get request failed: %v", err)
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}
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err = c.processResponse(res, out)
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if err != nil {
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return err
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}
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return nil
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}
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// processResponse takes the body of an HTTP response, and either returns
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// the error code, or unmarshalls the JSON response, extracts
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// rate limit info, and places it into the object
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// output parameter. This function closes the response body after reading it.
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func (c *client) processResponse(res *http.Response, out interface{}) error {
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body, err := io.ReadAll(res.Body)
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res.Body.Close()
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if err != nil {
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return err
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}
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if res.StatusCode != 200 {
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return newQuestradeError(res, body)
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}
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err = json.Unmarshal(body, out)
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if err != nil {
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return err
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}
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reset, _ := strconv.Atoi(res.Header.Get("X-RateLimit-Reset"))
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c.RateLimitReset = time.Unix(int64(reset), 0)
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c.RateLimitRemaining, _ = strconv.Atoi(res.Header.Get("X-RateLimit-Remaining"))
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return nil
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}
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// Login takes the refresh token from the client login credentials
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// and exchanges it for an access token. Returns a timer that
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// expires when the login session is over.
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// TODO - Return a proper error when login fails with HTTP 400 - Bad Request
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func (c *client) Login() error {
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login := loginServerURL
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vars := url.Values{"grant_type": {"refresh_token"}, "refresh_token": {c.Credentials.RefreshToken}}
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res, err := c.httpClient.PostForm(login+"token", vars)
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if err != nil {
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return err
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}
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err = c.processResponse(res, &c.Credentials)
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if err != nil {
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return err
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}
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c.SessionTimer = time.NewTimer(time.Duration(c.Credentials.ExpiresIn) * time.Second)
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return nil
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}
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// newClient is the factory function for clients - takes a refresh token and logs in
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func newClient(refreshToken string) (*client, error) {
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transport := &http.Transport{
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ResponseHeaderTimeout: 5 * time.Second,
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}
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httpClient := &http.Client{
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Transport: transport,
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}
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// Create a new client
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c := &client{
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Credentials: LoginCredentials{
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RefreshToken: refreshToken,
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},
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httpClient: httpClient,
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transport: transport,
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}
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err := c.Login()
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if err != nil {
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return nil, err
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}
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return c, nil
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}
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