clean routes

apps/website/lib/feature/FeatureFlagService.ts

@@ -0,0 +1,70 @@
+/**
+ * FeatureFlagService - Manages feature flags for both server and client
+ * 
+ * Server: Reads from process.env.FEATURE_FLAGS (comma-separated)
+ * Client: Reads from session context or provides mock implementation
+ */
+
+// Server-side implementation
+export class FeatureFlagService {
+  private flags: Set<string>;
+
+  constructor(flags?: string[]) {
+    if (flags) {
+      this.flags = new Set(flags);
+    } else {
+      // Parse from environment variable
+      const flagsEnv = process.env.FEATURE_FLAGS;
+      this.flags = flagsEnv 
+        ? new Set(flagsEnv.split(',').map(f => f.trim()))
+        : new Set();
+    }
+  }
+
+  /**
+   * Check if a feature flag is enabled
+   */
+  isEnabled(flag: string): boolean {
+    return this.flags.has(flag);
+  }
+
+  /**
+   * Get all enabled flags
+   */
+  getEnabledFlags(): string[] {
+    return Array.from(this.flags);
+  }
+
+  /**
+   * Factory method to create service with environment flags
+   */
+  static fromEnv(): FeatureFlagService {
+    return new FeatureFlagService();
+  }
+}
+
+// Client-side context interface
+export interface FeatureFlagContextType {
+  isEnabled: (flag: string) => boolean;
+  getEnabledFlags: () => string[];
+}
+
+// Mock implementation for client-side when no context is available
+export class MockFeatureFlagService implements FeatureFlagContextType {
+  private flags: Set<string>;
+
+  constructor(flags: string[] = []) {
+    this.flags = new Set(flags);
+  }
+
+  isEnabled(flag: string): boolean {
+    return this.flags.has(flag);
+  }
+
+  getEnabledFlags(): string[] {
+    return Array.from(this.flags);
+  }
+}
+
+// Default mock instance for client-side usage
+export const mockFeatureFlags = new MockFeatureFlagService(['alpha_features']);