feat: DNS provider abstraction — Technitium, Cloudflare, RFC 2136, Manual

- dns-providers/: adapter base class + registry with auto-discovery - technitium.js: wraps existing Technitium API calls into adapter interface - cloudflare.js: Cloudflare API v4 adapter (zones, records, credentials) - rfc2136.js: RFC 2136 dynamic DNS via nsupdate (BIND, PowerDNS, etc.) - manual.js: no-op adapter for external DNS management with instructions - provider-dns.js: provider-aware DNS context, resolves active adapter from config - Universal helper methods: universalCreateRecord/Delete/ResolveRecord - All 7 route files updated to use universal methods instead of raw dns.call() - Setup wizard: provider dropdown (Technitium, Cloudflare, RFC 2136, Manual) - DNS template selector: added Cloudflare and External/Manual options - Config schema: validates dns.provider field - Capability gating on Technitium-specific endpoints (logs, restart, update) - Backward compatible: no provider set = auto-detect (technitium if dns.ip exists)
2026-06-10 15:06:41 -07:00
parent 0aa1c3d077
commit 2de72ed506
21 changed files with 1965 additions and 33 deletions
@@ -0,0 +1,101 @@
+/**
+ * DNS Provider Registry
+ * Manages available DNS provider adapters.
+ * Providers register themselves, and the active provider is selected by config.
+ */
+const path = require('path');
+
+class DNSProviderRegistry {
+  constructor() {
+    this.providers = new Map();    // providerId -> adapter class
+    this.instances = new Map();    // providerId -> adapter instance
+  }
+
+  /** Register a provider adapter class */
+  register(adapterClass) {
+    const instance = new adapterClass({}, {});
+    const id = instance.providerId;
+    if (this.providers.has(id)) {
+      console.warn(`DNS provider "${id}" already registered, overwriting`);
+    }
+    this.providers.set(id, adapterClass);
+  }
+
+  /** Get list of all registered provider IDs */
+  getProviderIds() {
+    return Array.from(this.providers.keys());
+  }
+
+  /** Get metadata for all providers (without instantiating with real config) */
+  getProviderMeta() {
+    return this.getProviderIds().map(id => {
+      const Adapter = this.providers.get(id);
+      const inst = new Adapter({}, {});
+      return {
+        id: inst.providerId,
+        displayName: inst.displayName,
+        capabilities: inst.getCapabilities()
+      };
+    });
+  }
+
+  /** 
+   * Get or create an adapter instance for the given provider + config
+   * @param {string} providerId - The provider to instantiate
+   * @param {Object} config - Provider-specific configuration
+   * @param {Object} ctx - Shared application context
+   * @returns {BaseDNSProvider} The provider adapter instance
+   */
+  getProvider(providerId, config, ctx) {
+    // Re-create if config changed
+    const cacheKey = providerId;
+    const Adapter = this.providers.get(providerId);
+    if (!Adapter) {
+      throw new Error(`Unknown DNS provider: ${providerId}. Available: ${this.getProviderIds().join(', ')}`);
+    }
+    const instance = new Adapter(config, ctx);
+    this.instances.set(cacheKey, instance);
+    return instance;
+  }
+
+  /** Auto-discover and register all providers in this directory */
+  autoDiscover() {
+    const fs = require('fs');
+    const dir = __dirname;
+    const files = fs.readdirSync(dir).filter(f => 
+      f !== 'base.js' && f !== 'registry.js' && f.endsWith('.js') && !f.startsWith('.')
+    );
+    for (const file of files) {
+      try {
+        const Loaded = require(path.join(dir, file));
+        // Support: module.exports = Class, module.exports = { Class }, or plain objects
+        let cls = null;
+        if (typeof Loaded === 'function') {
+          cls = Loaded;
+        } else if (typeof Loaded === 'object' && Loaded !== null) {
+          // Try to find a class in the exported object
+          cls = Object.values(Loaded).find(v => typeof v === 'function');
+        }
+        if (cls) {
+          // Verify it has providerId (on prototype or set in constructor)
+          try {
+            const test = new cls({}, {});
+            if (test.providerId && typeof test.getCapabilities === 'function') {
+              this.register(cls);
+            }
+          } catch {
+            // Not a valid provider adapter, skip
+          }
+        }
+      } catch (err) {
+        console.error(`Failed to load DNS provider from ${file}:`, err.message);
+      }
+    }
+  }
+}
+
+// Singleton
+const registry = new DNSProviderRegistry();
+registry.autoDiscover();
+
+module.exports = registry;