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// The oauth package provides a Client that authenticates requests
// automatically with OAuth1.
//
// [Cardmarket OAuth] and [RFC 5849] were used as reference.
//
// [Cardmarket OAuth]: https://apiv2.cardmarket.com/ws/documentation/API:Auth_OAuthHeader
// [RFC 5849]: https://datatracker.ietf.org/doc/html/rfc5849#section-3.1
package oauth
import (
"context"
"fmt"
"io"
"log/slog"
"net/http"
"strings"
)
const (
headerAuthorization = "Authorization"
headerContentType = "Content-Type"
)
type ConsumerToken struct {
Token string
Secret string
}
type AccessToken struct {
Token string
Secret string
}
type Tokens struct {
Consumer ConsumerToken
Access AccessToken
}
type Client struct {
tokens Tokens
}
func NewClient(t Tokens) *Client {
return &Client{tokens: t}
}
func (c *Client) GetWithContext(
ctx context.Context,
url string,
) (*http.Response, error) {
return c.request(ctx, http.MethodGet, url, "", nil)
}
func (c *Client) PutWithContext(
ctx context.Context,
url, contentType string,
body io.Reader,
) (*http.Response, error) {
return c.request(ctx, http.MethodPut, url, contentType, body)
}
func (c *Client) PostWithContext(
ctx context.Context,
url, contentType string,
body io.Reader,
) (*http.Response, error) {
return c.request(ctx, http.MethodPost, url, contentType, body)
}
func (c *Client) DeleteWithContext(
ctx context.Context,
url string,
) (*http.Response, error) {
return c.request(ctx, http.MethodDelete, url, "", nil)
}
// request hydrates and fulfils a http.Request using information stored in the client
func (c *Client) request(
ctx context.Context,
method string,
url, contentType string,
body io.Reader,
) (*http.Response, error) {
req, err := http.NewRequestWithContext(ctx, method, url, body)
if err != nil {
return nil, err
}
if contentType != "" {
req.Header.Set(headerContentType, contentType)
}
if err = c.authorize(req); err != nil {
return nil, err
}
slog.DebugContext(
ctx,
"sending request",
"method", req.Method,
"url", req.URL.String(),
"contentType", req.Header.Get(headerContentType),
"authorization", strings.Join(req.Header.Values(headerAuthorization), ", "),
)
return http.DefaultClient.Do(req)
}
func (c *Client) authorize(req *http.Request) error {
baseURL := fmt.Sprintf(
"%s://%s%s",
strings.ToLower(req.URL.Scheme),
strings.ToLower(req.URL.Host),
req.URL.Path,
)
ah := newAuthHeader(
req.Method,
baseURL,
nil,
c.tokens,
)
req.Header.Set(headerAuthorization, ah.String())
return nil
}
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