mcp-youtube

import { google, youtube_v3 } from "googleapis"; import { calculateLikeToViewRatio, calculateCommentToViewRatio, } from "../utils/engagementCalculator.js"; import { parseYouTubeNumber } from "../utils/numberParser.js"; import { formatDescription } from "../utils/textUtils.js"; import { CacheService } from "./cache.service.js"; import { CACHE_TTLS, CACHE_COLLECTIONS } from "../config/cache.config.js"; import type { LeanChannelStatistics, LeanChannelTopVideo, LeanTrendingVideo, LeanComment, LeanReply, } from "../types/youtube.js"; import { GetVideoCommentsParams } from "../types/tools.js"; export interface VideoOptions { videoId: string; parts?: string[]; } export interface SearchOptions { query: string; maxResults?: number; order?: "relevance" | "date" | "viewCount"; type?: "video" | "channel"; channelId?: string; videoDuration?: "any" | "short" | "medium" | "long"; publishedAfter?: string; recency?: | "any" | "pastHour" | "pastDay" | "pastWeek" | "pastMonth" | "pastQuarter" | "pastYear"; regionCode?: string; videoCategoryId?: string; // Added } export interface ChannelOptions { channelId: string; maxResults?: number; includeTags?: boolean; descriptionDetail?: "NONE" | "SNIPPET" | "LONG"; } export interface TrendingOptions { regionCode?: string; categoryId?: string; maxResults?: number; } const API_COSTS = { // Read-operations "search.list": 100, "videos.list": 1, "channels.list": 1, "videoCategories.list": 1, "commentThreads.list": 1, "comments.list": 1, }; export class YoutubeService { private youtube: youtube_v3.Youtube; private cacheService: CacheService; private readonly MAX_RESULTS_PER_PAGE = 50; private readonly ABSOLUTE_MAX_RESULTS = 500; private apiCreditsUsed: number = 0; constructor(cacheService: CacheService) { this.cacheService = cacheService; this.youtube = google.youtube({ version: "v3", auth: process.env.YOUTUBE_API_KEY, }); } public getApiCreditsUsed(): number { return this.apiCreditsUsed; } public resetApiCreditsUsed(): void { this.apiCreditsUsed = 0; } private async trackCost<T>( operation: () => Promise<T>, cost: number ): Promise<T> { this.apiCreditsUsed += cost; return operation(); } private calculatePublishedAfter(recency: string): string { const now = new Date(); let millisecondsToSubtract = 0; switch (recency) { case "pastHour": millisecondsToSubtract = 60 * 60 * 1000; break; case "pastDay": millisecondsToSubtract = 24 * 60 * 60 * 1000; break; case "pastWeek": millisecondsToSubtract = 7 * 24 * 60 * 60 * 1000; break; case "pastMonth": millisecondsToSubtract = 30 * 24 * 60 * 60 * 1000; break; case "pastQuarter": millisecondsToSubtract = 90 * 24 * 60 * 60 * 1000; break; case "pastYear": millisecondsToSubtract = 365 * 24 * 60 * 60 * 1000; break; default: return ""; } const targetTime = new Date(now.getTime() - millisecondsToSubtract); if (["pastMonth", "pastQuarter", "pastYear"].includes(recency)) { targetTime.setDate(1); } return targetTime.toISOString(); } async getVideo( options: VideoOptions ): Promise<youtube_v3.Schema$Video | null> { const { videoId, parts = ["snippet"] } = options; const cacheKey = videoId; const operation = async (): Promise<youtube_v3.Schema$Video | null> => { try { const response = await this.trackCost( () => this.youtube.videos.list({ part: parts, id: [videoId] }), API_COSTS["videos.list"] ); return response.data.items?.[0] ?? null; } catch (error) { throw new Error( `YouTube API call for getVideo failed for videoId: ${videoId}`, { cause: error } ); } }; return this.cacheService.getOrSet( cacheKey, operation, CACHE_TTLS.STANDARD, CACHE_COLLECTIONS.VIDEO_DETAILS, options, ["snippet.thumbnails"] ); } async searchVideos( options: SearchOptions ): Promise<youtube_v3.Schema$SearchResult[]> { const cacheKey = this.cacheService.createOperationKey( "searchVideos", options ); const operation = async (): Promise<youtube_v3.Schema$SearchResult[]> => { try { const { query, maxResults = 10, order = "relevance", type = "video", channelId, videoDuration, publishedAfter, recency, regionCode, } = options; const results: youtube_v3.Schema$SearchResult[] = []; let nextPageToken: string | undefined = undefined; const targetResults = Math.min(maxResults, this.ABSOLUTE_MAX_RESULTS); let calculatedPublishedAfter = publishedAfter; if (recency && recency !== "any") { calculatedPublishedAfter = this.calculatePublishedAfter(recency); } while (results.length < targetResults) { const searchParams: youtube_v3.Params$Resource$Search$List = { part: ["snippet"], q: query, maxResults: Math.min( this.MAX_RESULTS_PER_PAGE, targetResults - results.length ), type: [type], order: order, pageToken: nextPageToken, }; if (channelId) { searchParams.channelId = channelId; } if (videoDuration && videoDuration !== "any") { searchParams.videoDuration = videoDuration; } if (calculatedPublishedAfter) { searchParams.publishedAfter = calculatedPublishedAfter; } if (regionCode) { searchParams.regionCode = regionCode; } const response = await this.trackCost( () => this.youtube.search.list(searchParams), API_COSTS["search.list"] ); const searchResponse: youtube_v3.Schema$SearchListResponse = response.data; if (!searchResponse.items?.length) { break; } results.push(...searchResponse.items); nextPageToken = searchResponse.nextPageToken || undefined; if (!nextPageToken) { break; } } return results.slice(0, targetResults); } catch (error) { throw new Error(`YouTube API call for searchVideos failed`, { cause: error, }); } }; return this.cacheService.getOrSet( cacheKey, operation, CACHE_TTLS.STANDARD, CACHE_COLLECTIONS.VIDEO_DETAILS, options, ["snippet.thumbnails"] ); } async batchFetchChannelStatistics( channelIds: string[] ): Promise<Map<string, youtube_v3.Schema$Channel>> { const results = new Map<string, youtube_v3.Schema$Channel>(); if (channelIds.length === 0) { return results; } try { const batchSize = 50; for (let i = 0; i < channelIds.length; i += batchSize) { const batch = channelIds.slice(i, i + batchSize); const response = await this.trackCost( () => this.youtube.channels.list({ part: ["snippet", "statistics"], id: batch, }), API_COSTS["channels.list"] ); if (response.data.items) { for (const channel of response.data.items) { if (channel.id) { results.set(channel.id, channel); } } } } } catch (error) { throw new Error(`API call for batchFetchChannelStatistics failed`, { cause: error, }); } return results; } async getChannelStatistics( channelId: string ): Promise<LeanChannelStatistics> { const cacheKey = channelId; const operation = async (): Promise<LeanChannelStatistics> => { try { const response = await this.trackCost( () => this.youtube.channels.list({ part: ["snippet", "statistics"], id: [channelId], }), API_COSTS["channels.list"] ); if (!response.data.items?.length) { throw new Error("Channel not found."); } const channel = response.data.items[0]; return { channelId: channelId, title: channel.snippet?.title, subscriberCount: parseYouTubeNumber( channel.statistics?.subscriberCount ), viewCount: parseYouTubeNumber(channel.statistics?.viewCount), videoCount: parseYouTubeNumber(channel.statistics?.videoCount), createdAt: channel.snippet?.publishedAt, }; } catch (error) { throw new Error( `YouTube API call for getChannelStatistics failed for channelId: ${channelId}`, { cause: error } ); } }; return this.cacheService.getOrSet( cacheKey, operation, CACHE_TTLS.STANDARD, CACHE_COLLECTIONS.CHANNEL_STATS ); } async fetchChannelRecentTopVideos( channelId: string, publishedAfter: string ): Promise<youtube_v3.Schema$Video[]> { const cacheKey = this.cacheService.createOperationKey( "fetchChannelRecentTopVideos", { channelId, publishedAfter } ); const operation = async (): Promise<youtube_v3.Schema$Video[]> => { try { const searchResponse = await this.trackCost( () => this.youtube.search.list({ channelId: channelId, part: ["snippet"], order: "viewCount", maxResults: 50, publishedAfter: publishedAfter, type: ["video"], }), API_COSTS["search.list"] ); const videoIds = searchResponse.data.items ?.map((item) => item.id?.videoId) .filter((id): id is string => id !== undefined) || []; if (videoIds.length === 0) { return []; } const videosResponse = await this.trackCost( () => this.youtube.videos.list({ part: ["statistics", "contentDetails"], id: videoIds, }), API_COSTS["videos.list"] ); return videosResponse.data.items || []; } catch (error) { throw new Error( `YouTube API call for fetchChannelRecentTopVideos failed for channelId: ${channelId} and publishedAfter: ${publishedAfter}`, { cause: error } ); } }; return this.cacheService.getOrSet( cacheKey, operation, CACHE_TTLS.SEMI_STATIC, CACHE_COLLECTIONS.CHANNEL_RECENT_TOP_VIDEOS, { channelId, publishedAfter } ); } async getChannelTopVideos( options: ChannelOptions ): Promise<LeanChannelTopVideo[]> { const cacheKey = this.cacheService.createOperationKey( "getChannelTopVideos", options ); const operation = async (): Promise<LeanChannelTopVideo[]> => { try { const { channelId, maxResults = 10, includeTags = false, descriptionDetail = "NONE", } = options; const searchResults: youtube_v3.Schema$SearchResult[] = []; let nextPageToken: string | undefined = undefined; const targetResults = Math.min(maxResults, this.ABSOLUTE_MAX_RESULTS); while (searchResults.length < targetResults) { const response = await this.trackCost( () => this.youtube.search.list({ part: ["id"], channelId: channelId, maxResults: Math.min( this.MAX_RESULTS_PER_PAGE, targetResults - searchResults.length ), order: "viewCount", type: ["video"], pageToken: nextPageToken, }), API_COSTS["search.list"] ); const searchResponse: youtube_v3.Schema$SearchListResponse = response.data; if (!searchResponse.items?.length) { break; } searchResults.push(...searchResponse.items); nextPageToken = searchResponse.nextPageToken || undefined; if (!nextPageToken) { break; } } if (!searchResults.length) { throw new Error("No videos found."); } const videoIds = searchResults .map((item) => item.id?.videoId) .filter((id): id is string => id !== undefined); const videoDetails: youtube_v3.Schema$Video[] = []; for (let i = 0; i < videoIds.length; i += this.MAX_RESULTS_PER_PAGE) { const batch = videoIds.slice(i, i + this.MAX_RESULTS_PER_PAGE); const response = await this.trackCost( () => this.youtube.videos.list({ part: ["snippet", "statistics", "contentDetails"], id: batch, }), API_COSTS["videos.list"] ); if (response.data.items) { videoDetails.push(...response.data.items); } } return videoDetails.slice(0, targetResults).map((video) => { const viewCount = parseYouTubeNumber(video.statistics?.viewCount); const likeCount = parseYouTubeNumber(video.statistics?.likeCount); const commentCount = parseYouTubeNumber( video.statistics?.commentCount ); const formattedDescription = formatDescription( video.snippet?.description, descriptionDetail ); const baseVideo = { id: video.id, title: video.snippet?.title, publishedAt: video.snippet?.publishedAt, duration: video.contentDetails?.duration, viewCount: viewCount, likeCount: likeCount, commentCount: commentCount, likeToViewRatio: calculateLikeToViewRatio(viewCount, likeCount), commentToViewRatio: calculateCommentToViewRatio( viewCount, commentCount ), categoryId: video.snippet?.categoryId ?? null, defaultLanguage: video.snippet?.defaultLanguage ?? null, }; const videoWithDescription = formattedDescription !== undefined ? { ...baseVideo, description: formattedDescription } : baseVideo; return includeTags ? { ...videoWithDescription, tags: video.snippet?.tags ?? [] } : videoWithDescription; }); } catch (error) { throw new Error( `YouTube API call for getChannelTopVideos failed for channelId: ${options.channelId}`, { cause: error } ); } }; return this.cacheService.getOrSet( cacheKey, operation, CACHE_TTLS.SEMI_STATIC, CACHE_COLLECTIONS.CHANNEL_TOP_VIDEOS, options ); } async getTrendingVideos( options: TrendingOptions ): Promise<LeanTrendingVideo[]> { const cacheKey = this.cacheService.createOperationKey( "getTrendingVideos", options ); const operation = async (): Promise<LeanTrendingVideo[]> => { try { const { regionCode = "US", categoryId, maxResults = 10 } = options; const params: youtube_v3.Params$Resource$Videos$List = { part: ["snippet", "statistics", "contentDetails"], chart: "mostPopular", regionCode: regionCode, maxResults: maxResults, }; if (categoryId) { params.videoCategoryId = categoryId; } const response = await this.trackCost( () => this.youtube.videos.list(params), API_COSTS["videos.list"] ); return ( response.data.items?.map((video) => { const viewCount = parseYouTubeNumber(video.statistics?.viewCount); const likeCount = parseYouTubeNumber(video.statistics?.likeCount); const commentCount = parseYouTubeNumber( video.statistics?.commentCount ); return { id: video.id, title: video.snippet?.title, channelId: video.snippet?.channelId, channelTitle: video.snippet?.channelTitle, publishedAt: video.snippet?.publishedAt, duration: video.contentDetails?.duration, viewCount: viewCount, likeCount: likeCount, commentCount: commentCount, likeToViewRatio: calculateLikeToViewRatio(viewCount, likeCount), commentToViewRatio: calculateCommentToViewRatio( viewCount, commentCount ), }; }) || [] ); } catch (error) { throw new Error(`YouTube API call for getTrendingVideos failed`, { cause: error, }); } }; return this.cacheService.getOrSet( cacheKey, operation, CACHE_TTLS.DYNAMIC, CACHE_COLLECTIONS.TRENDING_VIDEOS, options ); } async getVideoComments( options: GetVideoCommentsParams ): Promise<LeanComment[]> { const cacheKey = this.cacheService.createOperationKey( "getVideoComments", options ); const operation = async (): Promise<LeanComment[]> => { try { const { videoId, maxResults, order, maxReplies = 0, commentDetail, } = options; const commentThreadsResponse = await this.trackCost( () => this.youtube.commentThreads.list({ part: ["snippet"], videoId: videoId, maxResults: maxResults, order: order, }), API_COSTS["commentThreads.list"] ); const topLevelComments = commentThreadsResponse.data.items || []; let allReplies: youtube_v3.Schema$Comment[][] = []; if (maxReplies > 0 && topLevelComments.length > 0) { const replyPromises = topLevelComments.map((commentThread) => { const parentId = commentThread.id; if (!parentId) return Promise.resolve([]); return this.trackCost( () => this.youtube.comments.list({ part: ["snippet"], parentId: parentId, maxResults: maxReplies, }), API_COSTS["comments.list"] ).then((res) => res.data.items || []); }); allReplies = await Promise.all(replyPromises); } return topLevelComments.map((commentThread, index) => { const topLevelSnippet = commentThread.snippet?.topLevelComment?.snippet; const replies = allReplies[index] || []; const leanReplies: LeanReply[] = replies.map((reply) => { const replySnippet = reply.snippet; return { replyId: reply.id ?? "", author: replySnippet?.authorDisplayName ?? "", text: commentDetail === "SNIPPET" ? replySnippet?.textDisplay?.substring(0, 200) || "" : replySnippet?.textDisplay || "", publishedAt: replySnippet?.publishedAt ?? "", likeCount: replySnippet?.likeCount || 0, }; }); return { commentId: commentThread.id ?? "", author: topLevelSnippet?.authorDisplayName ?? "", text: commentDetail === "SNIPPET" ? topLevelSnippet?.textDisplay?.substring(0, 200) || "" : topLevelSnippet?.textDisplay || "", publishedAt: topLevelSnippet?.publishedAt ?? "", likeCount: topLevelSnippet?.likeCount || 0, replies: leanReplies, }; }); } catch (error: any) { if ( error.response?.status === 403 && error.response?.data?.error?.errors?.[0]?.reason === "commentsDisabled" ) { return []; } throw new Error( `YouTube API call for getVideoComments failed for videoId: ${options.videoId}`, { cause: error } ); } }; return this.cacheService.getOrSet( cacheKey, operation, CACHE_TTLS.DYNAMIC, CACHE_COLLECTIONS.VIDEO_COMMENTS, options ); } async getVideoCategories(regionCode: string = "US") { const cacheKey = this.cacheService.createOperationKey( "getVideoCategories", { regionCode, } ); const operation = async () => { try { const response = await this.trackCost( () => this.youtube.videoCategories.list({ part: ["snippet"], regionCode: regionCode, }), API_COSTS["videoCategories.list"] ); const categories = response.data.items?.map((category) => ({ id: category.id, title: category.snippet?.title, })); return categories || []; } catch (error) { throw new Error( `YouTube API call for getVideoCategories failed for regionCode: ${regionCode}`, { cause: error } ); } }; return this.cacheService.getOrSet( cacheKey, operation, CACHE_TTLS.STATIC, CACHE_COLLECTIONS.VIDEO_CATEGORIES, { regionCode } ); } }