feat: mail service

integration/gatewayauthsession/gateway_authsession_test.go

@@ -77,6 +77,26 @@ func TestGatewayAuthSessionConfirmCreatesProjectionAndAllowsSubscribeEvents(t *t
 	assertBootstrapEvent(t, event, h.responseSignerPublicKey, "request-bootstrap")
 }
 
+func TestGatewayAuthSessionAcceptLanguageIsForwardedToMailAndUser(t *testing.T) {
+	h := newGatewayAuthSessionHarness(t, gatewayAuthSessionOptions{})
+
+	clientPrivateKey := newClientPrivateKey("localized")
+	challengeID, code := h.sendChallengeWithAcceptLanguage(t, testEmail, "fr-FR, en;q=0.8")
+
+	deliveries := h.mailStub.RecordedDeliveries()
+	require.NotEmpty(t, deliveries)
+	require.Equal(t, "fr-FR", deliveries[len(deliveries)-1].Locale)
+
+	response := h.confirmCode(t, challengeID, code, clientPrivateKey)
+	require.Equal(t, http.StatusOK, response.StatusCode)
+
+	ensureCalls := h.userStub.EnsureCalls()
+	require.Len(t, ensureCalls, 1)
+	require.Equal(t, testEmail, ensureCalls[0].Email)
+	require.Equal(t, "fr-FR", ensureCalls[0].PreferredLanguage)
+	require.Equal(t, testTimeZone, ensureCalls[0].TimeZone)
+}
+
 func TestGatewayAuthSessionRepeatedConfirmReturnsSameSessionID(t *testing.T) {
 	h := newGatewayAuthSessionHarness(t, gatewayAuthSessionOptions{})
 

integration/gatewayauthsession/harness_test.go

@@ -196,9 +196,18 @@ func (h *gatewayAuthSessionHarness) readGatewaySessionRecord(t *testing.T, devic
 func (h *gatewayAuthSessionHarness) sendChallenge(t *testing.T, email string) (string, string) {
 	t.Helper()
 
-	response := postJSONValue(t, h.gatewayPublicURL+"/api/v1/public/auth/send-email-code", map[string]string{
-		"email": email,
-	})
+	return h.sendChallengeWithAcceptLanguage(t, email, "")
+}
+
+func (h *gatewayAuthSessionHarness) sendChallengeWithAcceptLanguage(t *testing.T, email string, acceptLanguage string) (string, string) {
+	t.Helper()
+
+	response := postJSONValueWithHeaders(
+		t,
+		h.gatewayPublicURL+"/api/v1/public/auth/send-email-code",
+		map[string]string{"email": email},
+		map[string]string{"Accept-Language": acceptLanguage},
+	)
 	require.Equal(t, http.StatusOK, response.StatusCode)
 
 	var body struct {
@@ -284,12 +293,24 @@ type gatewaySessionRecord struct {
 func postJSONValue(t *testing.T, targetURL string, body any) httpResponse {
 	t.Helper()
 
+	return postJSONValueWithHeaders(t, targetURL, body, nil)
+}
+
+func postJSONValueWithHeaders(t *testing.T, targetURL string, body any, headers map[string]string) httpResponse {
+	t.Helper()
+
 	payload, err := json.Marshal(body)
 	require.NoError(t, err)
 
 	request, err := http.NewRequest(http.MethodPost, targetURL, bytes.NewReader(payload))
 	require.NoError(t, err)
 	request.Header.Set("Content-Type", "application/json")
+	for key, value := range headers {
+		if value == "" {
+			continue
+		}
+		request.Header.Set(key, value)
+	}
 
 	client := &http.Client{Timeout: 5 * time.Second}