Add niconico views fallback.

package.json

@@ -24,6 +24,7 @@
     "graphql": "^16.8.1",
     "graphql-hooks": "^7.0.0",
     "graphql-hooks-memcache": "^3.2.0",
+    "linkedom": "^0.16.8",
     "material-symbols": "^0.14.7",
     "negotiator": "^0.6.3",
     "next": "^14.1.0",

src/lib/platforms/Niconico.ts

@@ -1,5 +1,8 @@
 import { Platform, VideoId, VideoThumbnails } from "./types";
 import { defaultFetchHeaders } from ".";
+import { parseHTML } from "linkedom";
+
+const nicoNicoVideoDomain = "https://www.nicovideo.jp/watch/"
 
 const nicoNicoAPIDomain = "https://nvapi.nicovideo.jp/v1/"
 const headers = {
@@ -10,6 +13,51 @@ const headers = {
 
 class NiconicoPlatform implements Platform {
 
+    // fallback to 
+    async getViewsFallback(
+        videoId: VideoId
+    ): Promise<number | null> {
+        console.log('niconico views fallback')
+        const result = await fetch(nicoNicoVideoDomain + videoId, {
+            method: 'GET',
+        })
+        if (!result) return null
+
+        const text = await result.text()
+
+        const parsedHTML = parseHTML(text)
+        // parse data-api-data
+        const dataElement = parsedHTML.document.getElementById("js-initial-watch-data")
+        if (!dataElement) { return null }
+
+        const videoData = JSON.parse(dataElement.getAttribute("data-api-data") || '[]')?.video
+
+        const rawViews = videoData?.count?.view
+        return rawViews == undefined ? null : Number.parseInt(rawViews)
+    }
+
+    getThumbnailsFallback(
+        videoId: VideoId
+    ): Promise<VideoThumbnails | null> {
+        return fetch(nicoNicoVideoDomain + videoId)
+            .then(response => response.text())
+            .then(text => {
+                const parsedHTML = parseHTML(text)
+                // parse data-api-data
+                const dataElement = parsedHTML.document.getElementById("js-initial-watch-data")
+                if (!dataElement) { return null }
+
+                const videoData = JSON.parse(dataElement.getAttribute("data-api-data") || '[]')?.video
+
+                const thumbnail = videoData?.thumbnail?.url
+                return thumbnail == undefined ? null : {
+                    default: thumbnail,
+                    quality: thumbnail
+                }
+            })
+            .catch(_ => { return null })
+    }
+
     // https://niconicolibs.github.io/api/nvapi/#tag/Video
     async getViews(
         videoId: VideoId
@@ -20,7 +68,7 @@ class NiconicoPlatform implements Platform {
         .then(videoData => {
             return videoData['data']['items'][0]['video']['count']['view']
         })
-        .catch(_ => { return null })
+        .catch(_ => { return this.getViewsFallback(videoId) })
     }
 
     getThumbnails(
@@ -37,7 +85,7 @@ class NiconicoPlatform implements Platform {
                 quality: thumbnails['largeUrl'] || defaultThumbnail
             }
         })
-        .catch(_ => { return null })
+        .catch(_ => { return this.getThumbnailsFallback(videoId) })
     }
 
 }