feat: add jellyfin integration (#672)

* feat: #655 implement jellyfin media server

* fix: table overflow

* feat: pr feedback

* refactor: format

* refactor: merge existing code

* fix: code smells

* refactor: format commit

packages/api/src/router/widgets/media-server.ts

@@ -0,0 +1,39 @@
+import { observable } from "@trpc/server/observable";
+
+import type { StreamSession } from "@homarr/integrations";
+import { createItemAndIntegrationChannel } from "@homarr/redis";
+
+import { createManyIntegrationMiddleware } from "../../middlewares/integration";
+import { createTRPCRouter, publicProcedure } from "../../trpc";
+
+export const mediaServerRouter = createTRPCRouter({
+  getCurrentStreams: publicProcedure
+    .unstable_concat(createManyIntegrationMiddleware("jellyfin", "plex"))
+    .query(async ({ ctx }) => {
+      return await Promise.all(
+        ctx.integrations.map(async (integration) => {
+          const channel = createItemAndIntegrationChannel<StreamSession[]>("mediaServer", integration.id);
+          const data = await channel.getAsync();
+          return {
+            integrationId: integration.id,
+            sessions: data?.data ?? [],
+          };
+        }),
+      );
+    }),
+  subscribeToCurrentStreams: publicProcedure
+    .unstable_concat(createManyIntegrationMiddleware("jellyfin", "plex"))
+    .subscription(({ ctx }) => {
+      return observable<{ integrationId: string; data: StreamSession[] }>((emit) => {
+        for (const integration of ctx.integrations) {
+          const channel = createItemAndIntegrationChannel<StreamSession[]>("mediaServer", integration.id);
+          void channel.subscribeAsync((sessions) => {
+            emit.next({
+              integrationId: integration.id,
+              data: sessions,
+            });
+          });
+        }
+      });
+    }),
+});