Add bearer token authentication

In this commit, we've added the capability to authenticate via bearer token to Meteologix's HTTP client. A new method "WithBearerToken" has been implemented, allowing a bearer token to be set in 'meteologix.go'. Additionally, in 'httpclient.go', the token is attached to the "Authorization" header for API requests. Tests asserting token setting functionality have been added in 'meteologix_test.go'. These changes open up an alternative authentication option for our API users. The bearer auth is not public yet, so there is no way for us to test this auth

httpclient.go

@@ -133,6 +133,10 @@ func (hc *HTTPClient) setAuthentication(hr *http.Request) {
 		hr.Header.Set("X-API-Key", hc.Config.apiKey)
 		return
 	}
+	if hc.bearerToken != "" {
+		hr.Header.Set("Authorization", "Bearer"+hc.bearerToken)
+		return
+	}
 	if hc.authUser != "" && hc.authPass != "" {
 		hr.SetBasicAuth(url.QueryEscape(hc.authUser), url.QueryEscape(hc.authPass))
 	}

meteologix.go

@@ -46,6 +46,8 @@ type Config struct {
 	authPass string
 	// authUser holds the (optional) username for the API user authentication
 	authUser string
+	// bearerToken holds the (optional) bearer token for the API authentication
+	bearerToken string
 	// userAgent represents an alternative User-Agent HTTP header string
 	userAgent string
 }
@@ -97,6 +99,17 @@ func WithAPIKey(k string) Option {
 	}
 }
 
+// WithBearerToken uses a bearer token for the client authentication of the
+// HTTP client
+func WithBearerToken(t string) Option {
+	if t == "" {
+		return nil
+	}
+	return func(co *Config) {
+		co.bearerToken = t
+	}
+}
+
 // WithPassword sets the HTTP Basic auth authPass for the HTTP client
 func WithPassword(p string) Option {
 	if p == "" {

meteologix_test.go

@@ -66,6 +66,28 @@ func TestNew_WithAPIKey(t *testing.T) {
 	}
 }
 
+func TestNew_WithBearerToken(t *testing.T) {
+	e := "BEARER-TOKEN"
+	c := New(WithBearerToken(e))
+	if c == nil {
+		t.Errorf("NewWithBearerToken failed, expected Client, got nil")
+		return
+	}
+	if c.config.bearerToken != e {
+		t.Errorf("NewWithBearerToken failed, expected token value: %s, got: %s", e,
+			c.config.bearerToken)
+	}
+	c = New(WithBearerToken(""))
+	if c == nil {
+		t.Errorf("NewWithBearerToken failed, expected Client, got nil")
+		return
+	}
+	if c.config.bearerToken != "" {
+		t.Errorf("NewWithBearerToken failed, expected empty token, got: %s",
+			c.config.bearerToken)
+	}
+}
+
 func TestNew_WithUsername(t *testing.T) {
 	e := "username"
 	c := New(WithUsername(e))