feat: Added simple basic auth based http client support

bitbucket/bitbucket.go

@@ -250,3 +250,38 @@ func (c *Client) GetPaged(ctx context.Context, api, path string, v interface{},
 	}
 	return c.Do(ctx, req, v)
 }
+
+// BasicAuthTransport supports creating a http client passing username/password as basic authentication header.
+type BasicAuthTransport struct {
+	Username string
+	Password string
+}
+
+// RoundTrip implements the RoundTripper interface.
+func (t *BasicAuthTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	req2 := setCredentialsAsHeaders(req, t.Username, t.Password)
+	return http.DefaultTransport.RoundTrip(req2)
+}
+
+func setCredentialsAsHeaders(req *http.Request, id, secret string) *http.Request {
+	// To set extra headers, we must make a copy of the Request so
+	// that we don't modify the Request we were given. This is required by the
+	// specification of http.RoundTripper.
+	//
+	// Since we are going to modify only req.Header here, we only need a deep copy
+	// of req.Header.
+	convertedRequest := new(http.Request)
+	*convertedRequest = *req
+	convertedRequest.Header = make(http.Header, len(req.Header))
+	for k, s := range req.Header {
+		convertedRequest.Header[k] = append([]string(nil), s...)
+	}
+	convertedRequest.SetBasicAuth(id, secret)
+	return convertedRequest
+}
+
+// Client returns an *http.Client that makes requests that are authenticated
+// using HTTP Basic Authentication.
+func (t *BasicAuthTransport) Client() *http.Client {
+	return &http.Client{Transport: t}
+}