Initial functional commit

sessions.go

@@ -0,0 +1,56 @@
+package tastytrade
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+type User struct {
+	Email       string `json:"email"`
+	Username    string `json:"username"`
+	ExternalID  string `json:"external-id"`
+	IsConfirmed bool   `json:"is-confirmed"`
+}
+
+type AuthData struct {
+	User         User   `json:"user"`
+	SessionToken string `json:"session-token"`
+}
+
+type AuthResponse struct {
+	Data    AuthData `json:"data"`
+	Context string   `json:"context"`
+}
+
+// Authenticate authenticates the client with the Tastytrade API
+func (api *TastytradeAPI) Authenticate(username, password string) error {
+	authURL := fmt.Sprintf("%s/sessions", api.host)
+	authData := map[string]string{
+		"login":    username,
+		"password": password,
+	}
+	authBody, err := json.Marshal(authData)
+	if err != nil {
+		return err
+	}
+
+	resp, err := api.httpClient.Post(authURL, "application/json", bytes.NewReader(authBody))
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
+		return fmt.Errorf("authentication failed: status code %d", resp.StatusCode)
+	}
+
+	authResponse := AuthResponse{}
+	if err := json.NewDecoder(resp.Body).Decode(&authResponse); err != nil {
+		return err
+	}
+
+	api.authToken = authResponse.Data.SessionToken
+	return nil
+}