Add support to get book info from book info page

src/qdbook.ts

@@ -0,0 +1,103 @@
+import type { BookGData, QdBookTag } from "./qdtypes";
+import type { SendMessage, Message } from "./types";
+import { QdBookTagType } from "./qdtypes";
+
+let g_data: BookGData | undefined;
+
+function get_book_name() {
+    const bookName = document.getElementById('bookName') as HTMLHeadingElement | null;
+    if (!bookName) {
+        throw new Error('Failed to find book name element');
+    }
+    return bookName.innerText.trim();
+}
+
+function get_book_tags() {
+    const tags: QdBookTag[] = [];
+    const attribute = document.querySelector('p.book-attribute');
+    if (attribute) {
+        for (const children of attribute.children) {
+            if (children instanceof HTMLSpanElement) {
+                if (children.classList.contains("dot")) {
+                    continue;
+                }
+                tags.push({
+                    type: QdBookTagType.System,
+                    name: children.innerText.trim(),
+                });
+            } else if (children instanceof HTMLAnchorElement) {
+                tags.push({
+                    type: QdBookTagType.Category,
+                    name: children.innerText.trim(),
+                    url: children.href,
+                });
+            } else {
+                throw new Error(`Unknown tag element: ${children.outerHTML}`);
+            }
+        }
+    }
+    const allLabel = document.querySelector('p.all-label');
+    if (allLabel) {
+        for (const label of allLabel.children) {
+            if (label instanceof HTMLAnchorElement) {
+                tags.push({
+                    type: QdBookTagType.User,
+                    name: label.innerText.trim(),
+                    url: label.href,
+                });
+            } else {
+                throw new Error(`Unknown user tag element: ${label.outerHTML}`);
+            }
+        }
+    }
+    return tags;
+}
+
+window.addEventListener('message', (event) => {
+    const data = event.data;
+    if (data && data['@type'] === 'g_data') {
+        g_data = data.g_data;
+        console.log('Received g_data:', g_data);
+    }
+});
+
+chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
+    const m = message as SendMessage;
+    try {
+        if (m.type === 'GetQdBookInfo') {
+            if (!g_data) {
+                const msg: Message = {
+                    ok: false,
+                    code: 404,
+                    msg: '没有找到g_data，可能是页面数据还没有加载完成，请稍后再试或者尝试刷新页面',
+                    for: m.type,
+                };
+                sendResponse(msg);
+                return;
+            }
+            const bookName = get_book_name();
+            const msg: Message = {
+                ok: true,
+                code: 0,
+                body: {
+                    type: 'QdBookInfo',
+                    bookInfo: g_data,
+                    bookName,
+                    id: g_data.pageJson.bookId,
+                    tags: get_book_tags(),
+                },
+                for: m.type,
+            };
+            sendResponse(msg);
+        }
+    } catch (e) {
+        console.error(e);
+        const msg: Message = {
+            ok: false,
+            code: 500,
+            msg: e instanceof Error ? e.message : 'Unknown error',
+            for: m.type,
+        };
+        sendResponse(msg);
+    }
+});