strongly type proxyConfig

Signed-off-by: Matt Benson <gudnabrsam@gmail.com>

plugins/proxy-node/package.json

@@ -49,11 +49,12 @@
   },
   "dependencies": {
     "@backstage/backend-plugin-api": "workspace:^",
-    "@backstage/types": "workspace:^"
+    "http-proxy-middleware": "^2.0.0"
   },
   "devDependencies": {
     "@backstage/backend-test-utils": "workspace:^",
     "@backstage/cli": "workspace:^",
-    "@backstage/config": "workspace:^"
+    "@backstage/config": "workspace:^",
+    "@types/http-proxy-middleware": "^1.0.0"
   }
 }

plugins/proxy-node/report-alpha.api.md

@@ -4,12 +4,24 @@
 
 ```ts
 import { ExtensionPoint } from '@backstage/backend-plugin-api';
-import { JsonObject } from '@backstage/types';
+import { Options } from 'http-proxy-middleware';
+
+// @alpha
+export interface ProxyConfig extends Options {
+  // (undocumented)
+  allowedHeaders?: string[];
+  // (undocumented)
+  allowedMethods?: string[];
+  // (undocumented)
+  credentials?: 'require' | 'forward' | 'dangerously-allow-unauthenticated';
+  // (undocumented)
+  reviveRequestBody?: boolean;
+}
 
 // @alpha
 export interface ProxyEndpointsExtensionPoint {
   // (undocumented)
-  addProxyEndpoints(endpoints: JsonObject): void;
+  addProxyEndpoints(endpoints: Record<string, string | ProxyConfig>): void;
 }
 
 // @alpha

plugins/proxy-node/src/alpha/index.ts

@@ -14,7 +14,19 @@
  * limitations under the License.
  */
 import { createExtensionPoint } from '@backstage/backend-plugin-api';
-import { JsonObject } from '@backstage/types';
+import { Options } from 'http-proxy-middleware';
+
+/**
+ * http-proxy-middleware proxy config interface.
+ *
+ * @alpha
+ */
+export interface ProxyConfig extends Options {
+  allowedMethods?: string[];
+  allowedHeaders?: string[];
+  reviveRequestBody?: boolean;
+  credentials?: 'require' | 'forward' | 'dangerously-allow-unauthenticated';
+}
 
 /**
  * Extension point interface for managing proxy endpoints.
@@ -22,7 +34,7 @@ import { JsonObject } from '@backstage/types';
  * @alpha
  */
 export interface ProxyEndpointsExtensionPoint {
-  addProxyEndpoints(endpoints: JsonObject): void;
+  addProxyEndpoints(endpoints: Record<string, string | ProxyConfig>): void;
 }
 
 /**