Youtube API v3を用いた全件取得

manifest.chrome.json

@@ -3,7 +3,8 @@
   "name": "YT Playlist Features",
   "version": "0.1.1",
   "description": "Extract and work with YouTube playlist data",
-  "permissions": [],
+  "permissions": ["storage"],
+  "host_permissions": ["https://www.googleapis.com/*"],
   "background": {
     "service_worker": "background/service-worker.js"
   },

manifest.firefox.json

@@ -3,7 +3,8 @@
   "name": "YT Playlist Features",
   "version": "0.1.1",
   "description": "Extract and work with YouTube playlist data",
-  "permissions": [],
+  "permissions": ["storage"],
+  "host_permissions": ["https://www.googleapis.com/*"],
   "background": {
     "scripts": ["background/service-worker.js"]
   },

src/background/service-worker.ts

@@ -1,19 +1,118 @@
 import browser from "webextension-polyfill";
 import type { Message } from "../shared/messages";
+import type { DetailUpdate } from "../types/playlist";
+import { CATEGORY_MAP } from "../shared/category-map";
 
-const LOG_PREFIX = "[yt-playlist-features:bg]";
+const LOG = "[yt-playlist-features:bg]";
+const DEFAULT_API_KEY = "AIzaSyDPyWG3ABnVV3en_KBhIxUH6O2_A0oP4Wk";
+const BATCH_SIZE = 50;
+
+async function getApiKey(): Promise<string> {
+  const result = await browser.storage.sync.get("apiKey");
+  return (result.apiKey as string) || DEFAULT_API_KEY;
+}
+
+const BATCH_DELAY = 500; // ms between batches
+const RETRY_DELAY = 5000; // ms before retrying after rate limit
+const MAX_RETRIES = 3;
+
+async function fetchVideoDetails(
+  videoIds: string[],
+  tabId: number,
+): Promise<void> {
+  const apiKey = await getApiKey();
+  if (!apiKey) {
+    browser.tabs.sendMessage(tabId, {
+      type: "VIDEO_DETAILS_ERROR",
+      error: "no-api-key",
+    } satisfies Message);
+    return;
+  }
+
+  for (let i = 0; i < videoIds.length; i += BATCH_SIZE) {
+    if (i > 0) await new Promise((r) => setTimeout(r, BATCH_DELAY));
+
+    const batch = videoIds.slice(i, i + BATCH_SIZE);
+    const ids = batch.join(",");
+    const url = `https://www.googleapis.com/youtube/v3/videos?part=snippet,statistics&id=${ids}&key=${apiKey}`;
+
+    let success = false;
+    for (let attempt = 0; attempt < MAX_RETRIES; attempt++) {
+      try {
+        if (attempt > 0) {
+          console.log(LOG, `Retry ${attempt} after rate limit, waiting ${RETRY_DELAY}ms...`);
+          await new Promise((r) => setTimeout(r, RETRY_DELAY));
+        }
+
+        const res = await fetch(url);
+        if (res.status === 403) {
+          console.warn(LOG, `Rate limited (attempt ${attempt + 1}/${MAX_RETRIES})`);
+          continue;
+        }
+        if (!res.ok) {
+          const body = await res.text();
+          console.error(LOG, `API error ${res.status}:`, body);
+          browser.tabs.sendMessage(tabId, {
+            type: "VIDEO_DETAILS_ERROR",
+            error: `api-error-${res.status}`,
+          } satisfies Message);
+          return;
+        }
+
+        const data = await res.json();
+        const updates: DetailUpdate[] = (data.items ?? []).map((item: any) => ({
+          videoId: item.id,
+          viewCountText: item.statistics?.viewCount
+            ? parseInt(item.statistics.viewCount, 10).toLocaleString()
+            : null,
+          publishedAt: item.snippet?.publishedAt?.slice(0, 10) ?? null,
+          category: CATEGORY_MAP[item.snippet?.categoryId] ?? null,
+        }));
+
+        browser.tabs.sendMessage(tabId, {
+          type: "VIDEO_DETAILS_UPDATE",
+          updates,
+        } satisfies Message);
+        success = true;
+        break;
+      } catch (e) {
+        console.error(LOG, "Fetch failed:", e);
+        browser.tabs.sendMessage(tabId, {
+          type: "VIDEO_DETAILS_ERROR",
+          error: "network-error",
+        } satisfies Message);
+        return;
+      }
+    }
+
+    if (!success) {
+      console.error(LOG, "Max retries exceeded for batch");
+      browser.tabs.sendMessage(tabId, {
+        type: "VIDEO_DETAILS_ERROR",
+        error: "rate-limit-exceeded",
+      } satisfies Message);
+      return;
+    }
+  }
+}
 
 browser.runtime.onMessage.addListener(
-  async (message: unknown, _sender: browser.Runtime.MessageSender) => {
+  async (message: unknown, sender: browser.Runtime.MessageSender) => {
     const msg = message as Message;
 
     if (msg.type === "PLAYLIST_EXTRACTED") {
       console.log(
-        LOG_PREFIX,
+        LOG,
         `Playlist: "${msg.data.metadata.title}" (${msg.data.extractedCount} videos)`,
       );
     }
+
+    if (msg.type === "FETCH_VIDEO_DETAILS") {
+      const tabId = sender.tab?.id;
+      if (!tabId) return;
+      fetchVideoDetails(msg.videoIds, tabId);
+    }
   },
 );
 
-console.log(LOG_PREFIX, "Service worker started.");
+console.log(LOG, "Service worker started.");

src/content/index.ts

@@ -108,11 +108,6 @@ function handlePlaylistAppend(event: Event): void {
     return;
   }
 
-  if (payload.type === "details_update") {
-    updateTableDetails(payload.updates);
-    return;
-  }
-
   if (payload.type === "append") {
     const newVideos: PlaylistVideo[] = payload.videos.map(mapRawVideo);
     appendToTable(newVideos);
@@ -126,6 +121,17 @@ function handlePlaylistAppend(event: Event): void {
 document.addEventListener("__yt_playlist_ext_data", handlePlaylistData);
 document.addEventListener("__yt_playlist_ext_data", handlePlaylistAppend);
 
+// Listen for detail updates from background service worker
+browser.runtime.onMessage.addListener((message: unknown) => {
+  const msg = message as Message;
+  if (msg.type === "VIDEO_DETAILS_UPDATE") {
+    updateTableDetails(msg.updates);
+  }
+  if (msg.type === "VIDEO_DETAILS_ERROR") {
+    console.error(LOG, "Detail fetch error:", msg.error);
+  }
+});
+
 // Detect playlist page navigation and trigger extraction
 onPlaylistPageReady(() => {
   const playlistId = getPlaylistId();

src/content/ui/lifecycle.ts

@@ -1,6 +1,7 @@
 import type { PlaylistData, PlaylistVideo } from "../../types/playlist";
 import { injectStyles } from "./styles";
-import { renderPlaylistTable, type PlaylistTableHandle, type DetailUpdate } from "./table-renderer";
+import type { DetailUpdate } from "../../types/playlist";
+import { renderPlaylistTable, type PlaylistTableHandle } from "./table-renderer";
 
 const CONTAINER_ID = "ytpf-playlist-table";
 

src/content/ui/table-renderer.ts

@@ -1,4 +1,6 @@
-import type { PlaylistData, PlaylistVideo } from "../../types/playlist";
+import browser from "webextension-polyfill";
+import type { PlaylistData, PlaylistVideo, DetailUpdate } from "../../types/playlist";
+import type { Message } from "../../shared/messages";
 import { t } from "./i18n";
 
 type SortKey = "index" | "title" | "channel" | "duration" | "views" | "published" | "category" | "addedBy" | "votes";
@@ -332,13 +334,6 @@ function buildRow(
   return tr;
 }
 
-export interface DetailUpdate {
-  videoId: string;
-  viewCountText: string | null;
-  publishedAt: string | null;
-  category: string | null;
-}
-
 export interface PlaylistTableHandle {
   element: HTMLElement;
   appendVideos(newVideos: PlaylistVideo[]): void;
@@ -395,11 +390,10 @@ export function renderPlaylistTable(data: PlaylistData): PlaylistTableHandle {
     detailsFetched = true;
     fetchBtn.disabled = true;
     fetchBtn.textContent = `${t("fetchViewsProgress")} 0/${targetIds.length}`;
-    document.dispatchEvent(
+    browser.runtime.sendMessage({
-      new CustomEvent("__yt_playlist_ext_fetch_details", {
+      type: "FETCH_VIDEO_DETAILS",
-        detail: JSON.stringify({ videoIds: targetIds }),
+      videoIds: targetIds,
-      }),
+    } satisfies Message);
-    );
   });
 
   header.append(titleSpan, metaSpan, fetchBtn, toggle);

src/injected/page-script.ts

@@ -19,8 +19,6 @@
   let isInitialLoad = true;
   let collabCache: Map<string, string> = new Map();
   let collabCachePlaylistId: string | null = null;
-  let lastBaseContext: any = null;
-  let lastAuthHeaders: Record<string, string> = {};
 
   function runExtraction() {
     if (!isPlaylistUrl()) return;
@@ -39,48 +37,6 @@
   // Listen for explicit trigger from content script
   document.addEventListener("__yt_playlist_ext_trigger", runExtraction);
 
-  // Handle on-demand detail fetching via player API
-  document.addEventListener("__yt_playlist_ext_fetch_details", async (e) => {
-    const { videoIds } = JSON.parse((e as CustomEvent).detail);
-    if (!videoIds?.length || !lastBaseContext) return;
-
-    const concurrency = 5;
-    for (let i = 0; i < videoIds.length; i += concurrency) {
-      const batch = videoIds.slice(i, i + concurrency);
-      const results = await Promise.all(
-        batch.map(async (id: string) => {
-          try {
-            const res = await fetch(
-              "https://www.youtube.com/youtubei/v1/player?prettyPrint=false",
-              {
-                method: "POST",
-                headers: { "Content-Type": "application/json", ...lastAuthHeaders },
-                credentials: "same-origin",
-                body: JSON.stringify({ context: lastBaseContext, videoId: id }),
-              },
-            );
-            if (!res.ok) return null;
-            const data = await res.json();
-            const vc = data.videoDetails?.viewCount;
-            const mf = data.microformat?.playerMicroformatRenderer;
-            return {
-              videoId: id,
-              viewCountText: vc ? parseInt(vc, 10).toLocaleString() : null,
-              publishedAt: mf?.publishDate ?? null,
-              category: mf?.category ?? null,
-            };
-          } catch {
-            return null;
-          }
-        }),
-      );
-      const updates = results.filter(Boolean);
-      if (updates.length > 0) {
-        sendResult({ type: "details_update", updates });
-      }
-    }
-  });
-
   // Reset on navigation away
   document.addEventListener("yt-navigate-start", () => {
     extractingUrl = null;
@@ -108,8 +64,6 @@
   async function extractAndSend(): Promise<void> {
     const { cfg, apiKey, baseContext } = getConfig();
     const authHeaders = buildAuthHeaders(cfg, baseContext);
-    lastBaseContext = baseContext;
-    lastAuthHeaders = authHeaders;
 
     // Try ytInitialData only on initial page load.
     // On SPA navigation ytInitialData is stale (still holds the previous page's data),

src/shared/category-map.ts

@@ -0,0 +1,18 @@
+/** YouTube video category ID to name mapping */
+export const CATEGORY_MAP: Record<string, string> = {
+  "1": "Film & Animation",
+  "2": "Autos & Vehicles",
+  "10": "Music",
+  "15": "Pets & Animals",
+  "17": "Sports",
+  "19": "Travel & Events",
+  "20": "Gaming",
+  "22": "People & Blogs",
+  "23": "Comedy",
+  "24": "Entertainment",
+  "25": "News & Politics",
+  "26": "Howto & Style",
+  "27": "Education",
+  "28": "Science & Technology",
+  "29": "Nonprofits & Activism",
+};

src/shared/messages.ts

@@ -1,3 +1,7 @@
-import type { PlaylistData } from "../types/playlist";
+import type { PlaylistData, DetailUpdate } from "../types/playlist";
 
-export type Message = { type: "PLAYLIST_EXTRACTED"; data: PlaylistData };
+export type Message =
+  | { type: "PLAYLIST_EXTRACTED"; data: PlaylistData }
+  | { type: "FETCH_VIDEO_DETAILS"; videoIds: string[] }
+  | { type: "VIDEO_DETAILS_UPDATE"; updates: DetailUpdate[] }
+  | { type: "VIDEO_DETAILS_ERROR"; error: string };

src/types/playlist.ts

@@ -50,6 +50,13 @@ export interface PlaylistMetadata {
   privacy: "public" | "unlisted" | "private" | "unknown";
 }
 
+export interface DetailUpdate {
+  videoId: string;
+  viewCountText: string | null;
+  publishedAt: string | null;
+  category: string | null;
+}
+
 export interface PlaylistData {
   metadata: PlaylistMetadata;
   videos: PlaylistVideo[];