show deprecation warning (#226)

## Description

Describe your changes.

## Motivation and Context

Why is this change required? What problem does it solve? If it fixes an
open
issue, please link to the issue here.

## Documentation impact

- [ ] Documentation update required
- [ ] Documentation updated [in another PR](_)
- [x] No documentation update required

## Types of changes

- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to
      not work as expected)

Author: Gawor270

packages/js-server-sdk/src/client.ts

@@ -1,4 +1,4 @@
-import axios from 'axios';
+import axios, { RawAxiosResponseHeaders } from 'axios';
 import {
   RoomApi,
   ViewerApi,
@@ -23,6 +23,7 @@ export class FishjamClient {
   private readonly viewerApi: ViewerApi;
   private readonly streamerApi: StreamerApi;
   private readonly fishjamConfig: FishjamConfig;
+  private deprecationWarningShown: boolean = false;
 
   /**
    * Create new instance of Fishjam Client.
@@ -43,6 +44,11 @@ export class FishjamClient {
       },
     });
 
+    client.interceptors.response.use((response) => {
+      this.handleDeprecationHeader(response.headers);
+      return response;
+    });
+
     const fishjamUrl = getFishjamUrl(config);
 
     this.roomApi = new RoomApi(undefined, fishjamUrl, client);
@@ -51,6 +57,23 @@ export class FishjamClient {
     this.fishjamConfig = config;
   }
 
+  private handleDeprecationHeader(headers: RawAxiosResponseHeaders): void {
+    try {
+      const deprecationHeader = headers['x-fishjam-api-deprecated'];
+      if (!deprecationHeader || this.deprecationWarningShown) return;
+      const deprecationStatus = JSON.parse(deprecationHeader as string);
+
+      if (deprecationStatus.status === 'unsupported') {
+        console.error(deprecationStatus.message);
+      } else if (deprecationStatus.status === 'deprecated') {
+        console.warn(deprecationStatus.message);
+      }
+      this.deprecationWarningShown = true;
+    } catch {
+      // ignore parsing errors
+    }
+  }
+
   /**
    * Create a new room. All peers connected to the same room will be able to send/receive streams to each other.
    */