feat(gateway): parse Apollo inventory and launch replies

gateway/apollo_management.go

@@ -0,0 +1,42 @@
+package gateway
+
+import (
+	"encoding/xml"
+	"strings"
+)
+
+type apolloLaunchResponse struct {
+	StatusCode string `xml:"status_code,attr"`
+	SessionURL string `xml:"sessionUrl0"`
+}
+
+func apolloInventoryContains(data []byte, applicationID string) bool {
+	if len(data) == 0 || len(data) > 64<<10 || applicationID == "" {
+		return false
+	}
+	var document struct {
+		Applications []struct {
+			ID string `xml:"ID"`
+		} `xml:"App"`
+	}
+	if xml.Unmarshal(data, &document) != nil {
+		return false
+	}
+	for _, application := range document.Applications {
+		if strings.TrimSpace(application.ID) == applicationID {
+			return true
+		}
+	}
+	return false
+}
+
+func parseApolloLaunchResponse(data []byte) (apolloLaunchResponse, error) {
+	if len(data) == 0 || len(data) > 64<<10 {
+		return apolloLaunchResponse{}, ErrProviderMalformed
+	}
+	var response apolloLaunchResponse
+	if xml.Unmarshal(data, &response) != nil || response.StatusCode != "200" || strings.TrimSpace(response.SessionURL) == "" {
+		return apolloLaunchResponse{}, ErrProviderMalformed
+	}
+	return response, nil
+}

gateway/apollo_management_test.go

@@ -0,0 +1,16 @@
+package gateway
+
+import "testing"
+
+func TestApolloInventoryAndLaunchResponseRequireExactApplicationAndSuccess(t *testing.T) {
+	inventory := []byte(`<root><App><ID>41</ID></App><App><ID>42</ID></App></root>`)
+	if !apolloInventoryContains(inventory, "42") || apolloInventoryContains(inventory, "420") {
+		t.Fatal("apolloInventoryContains() did not require an exact inventory ID")
+	}
+	if _, err := parseApolloLaunchResponse([]byte(`<root status_code="200"><sessionUrl0>rtspenc://apollo.test:47984</sessionUrl0></root>`)); err != nil {
+		t.Fatalf("parseApolloLaunchResponse() error = %v", err)
+	}
+	if _, err := parseApolloLaunchResponse([]byte(`<root status_code="403"><sessionUrl0>rtspenc://apollo.test:47984</sessionUrl0></root>`)); err == nil {
+		t.Fatal("parseApolloLaunchResponse() accepted a denied launch")
+	}
+}