Allow camera capabilities to be configured.

src/camera-manager/capabilities.ts

@@ -0,0 +1,60 @@
+import {
+  CapabilitiesRaw,
+  CapabilityKey,
+  capabilityKeys,
+  PTZCapabilities,
+} from '../types';
+import { CapabilitySearchOptions } from './types';
+
+export class Capabilities {
+  private _capabilities: CapabilitiesRaw;
+
+  constructor(
+    capabilities: CapabilitiesRaw,
+    options?: {
+      disable?: CapabilityKey[];
+      disableExcept?: CapabilityKey[];
+    },
+  ) {
+    this._capabilities = capabilities;
+
+    for (const key of options?.disable ?? []) {
+      this._disable(key);
+    }
+    for (const key of capabilityKeys) {
+      if (options?.disableExcept?.length && !options.disableExcept.includes(key)) {
+        this._disable(key);
+      }
+    }
+  }
+
+  protected _disable(capability: CapabilityKey): void {
+    delete this._capabilities[capability];
+  }
+
+  public matches(capability: CapabilitySearchOptions): boolean {
+    let result = true;
+    if (typeof capability === 'string') {
+      result &&= this.has(capability);
+    }
+    if (typeof capability === 'object' && capability.allCapabilities) {
+      result &&= capability.allCapabilities.every((capability) => this.has(capability));
+    }
+    if (typeof capability === 'object' && capability.anyCapabilities) {
+      result &&= capability.anyCapabilities.some((capability) => this.has(capability));
+    }
+    return result;
+  }
+
+  public has(capability: CapabilityKey): boolean {
+    return !!this._capabilities[capability];
+  }
+
+  public getPTZCapabilities(): PTZCapabilities | null {
+    return this._capabilities.ptz ?? null;
+  }
+
+  public getRawCapabilities(): CapabilitiesRaw {
+    return this._capabilities;
+  }
+}