feat: add Amvstrm as provider for stream URL

Summary:

Test Plan:

src/controllers/episodes/getEpisodeUrl/amvstrm.ts

@@ -0,0 +1,75 @@
+import type { FetchUrlResponse } from "./responseType";
+
+export async function getSourcesFromAmvstrm(
+  watchId: string,
+): Promise<FetchUrlResponse | null> {
+  const source = await fetch(
+    `https://api-amvstrm.nyt92.eu.org/api/v2/stream/${watchId}`,
+  )
+    .then((res) => res.json<AmvstrmStreamResponse>())
+    .then(({ stream }) => {
+      const streamObj = stream?.multi;
+      if (!!streamObj) {
+        return streamObj.main ?? streamObj.backup;
+      }
+    })
+    .then((streamObj) => streamObj?.url);
+
+  if (!source) {
+    return null;
+  }
+
+  return {
+    source,
+    subtitles: [],
+    audio: [],
+  };
+}
+
+interface AmvstrmStreamResponse {
+  code: number;
+  message: string;
+  info: Info;
+  stream: Stream;
+  iframe: Iframe[];
+  plyr: Nspl;
+  nspl: Nspl;
+}
+
+interface Iframe {
+  name: string;
+  iframe: string;
+}
+
+interface Info {
+  title: string;
+  id: string;
+  episode: string;
+}
+
+interface Nspl {
+  main: string;
+  backup: string;
+}
+
+interface Stream {
+  multi: Multi;
+  tracks: Tracks;
+}
+
+interface Multi {
+  main: Backup;
+  backup: Backup;
+}
+
+interface Backup {
+  url: string;
+  label: string;
+  isM3U8: boolean;
+  quality: string;
+}
+
+interface Tracks {
+  file: string;
+  kind: string;
+}

src/controllers/episodes/getEpisodeUrl/index.spec.ts

@@ -90,4 +90,45 @@ describe('requests the "/episodes/:id/url" route', () => {
     expect(response.json()).resolves.toEqual({ success: false });
     expect(response.status).toBe(404);
   });
+
+  it("with sources from Amvstrm", async () => {
+    const response = await app.request(
+      "/episodes/1/url",
+      {
+        method: "POST",
+        body: JSON.stringify({
+          provider: "amvstrm",
+          id: "ore-dake-level-up-na-ken-episode-2",
+        }),
+        headers: { "Content-Type": "application/json" },
+      },
+      {
+        ENABLE_ANIFY: "true",
+      },
+    );
+
+    expect(response.json()).resolves.toEqual({
+      success: true,
+      result: {
+        source:
+          "https://www032.vipanicdn.net/streamhls/aa804a2400535d84dd59454b28d329fb/ep.1.1712504065.m3u8",
+        subtitles: [],
+        audio: [],
+      },
+    });
+  });
+
+  it("with no URL from Amvstrm source", async () => {
+    const response = await app.request("/episodes/-1/url", {
+      method: "POST",
+      body: JSON.stringify({
+        provider: "amvstrm",
+        id: "unknown",
+      }),
+      headers: { "Content-Type": "application/json" },
+    });
+
+    expect(response.json()).resolves.toEqual({ success: false });
+    expect(response.status).toBe(404);
+  });
 });

src/controllers/episodes/getEpisodeUrl/index.ts

@@ -112,6 +112,26 @@ app.openapi(route, async (c) => {
     }
   }
 
+  if (provider === "amvstrm") {
+    try {
+      const result = await import("./amvstrm").then(
+        ({ getSourcesFromAmvstrm }) => getSourcesFromAmvstrm(id),
+      );
+      if (!result) {
+        return c.json({ success: false }, { status: 404 });
+      }
+
+      return c.json({
+        success: true,
+        result,
+      });
+    } catch (e) {
+      console.error("Failed to fetch download URL from Amvstrm", e);
+
+      return c.json(ErrorResponse, { status: 500 });
+    }
+  }
+
   return c.json(ErrorResponse, { status: 400 });
 });