Download all photos from facebook Page

download.js

(async () => {
  function sleep(ms) {
    return new Promise((resolve) => setTimeout(resolve, ms));
  }
  function findToken() {
    const tags = Array.from(
      document.body.querySelectorAll("script:not([src])")
    );

    let fb_dtsg = "";
    let id = "";
    for (const tag of tags) {
      let matches = tag.textContent.match(
        /"token":"([a-zA-Z0-9_-]+):([0-9]+):([0-9]+)"/
      );
      if (matches) {
        fb_dtsg = `${matches[1]}:${matches[2]}:${matches[3]}`;
        matches = tag.textContent.match(/"pageID":"([0-9]+)"/);
        if (matches) {
          id = matches[1];
          break;
        } else {
          matches = tag.textContent.match(
            /"rawSectionToken":"([0-9]+):([0-9]+)"/
          );
          if (matches) {
            id = btoa(`app_collection:${matches[1]}:${matches[2]}:5`);
            break;
          }
        }
      }
    }
    return { fb_dtsg, id };
  }
  async function findDocId(method) {
    const regex = new RegExp(
      `__d\\("${method}\\.graphql"(.*)params:\\{id:"([0-9]+)"`
    );
    const promises = await Promise.all(
      Array.from(
        document.head.querySelectorAll(
          'script[crossorigin="anonymous"][async="1"][src]'
        )
      ).map((tag) => {
        return fetch(tag.getAttribute("src"))
          .then((response) => response.text())
          .then((content) => {
            return content.match(regex);
          });
      })
    );
    return promises.find((item) => !!item)[2];
  }
  async function getLinks(
    { fb_dtsg, id, doc_id, isPage, method },
    cursor = null
  ) {
    const variables = isPage
      ? `{"count":10,"cursor":${cursor},"scale":4,"id":"${id}"}`
      : `{"count":8,"cursor":${cursor},"scale":1,"id":"${id}"}`;
    const data = {
      doc_id, // __d\("PagesCometPhotosTabMainViewAllPhotosSectionPaginationQuery\.graphql"(.*)params:\{id:"([0-9]+)"
      fb_dtsg, // "token":"([a-zA-Z0-9]+):([0-9]+):([0-9]+)"
      variables,
      fb_api_caller_class: "RelayModern",
      fb_api_req_friendly_name: method,
    };
    const formBody = [];
    for (const property in data) {
      const encodedKey = encodeURIComponent(property);
      const encodedValue = encodeURIComponent(data[property]);
      formBody.push(encodedKey + "=" + encodedValue);
    }

    return fetch("https://www.facebook.com/api/graphql/", {
      headers: {
        "content-type": "application/x-www-form-urlencoded",
        "user-agent":
          "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36",
        "x-fb-friendly-name": method,
      },
      body: formBody.join("&"),
      method: "POST",
    })
      .then((response) => response.json())
      .then(({ data }) => {
        if (isPage) {
          return {
            images: data.node.allPhotos.edges.map((item) => {
              return {
                ...item.node.image,
                ...item.node.viewer_image,
              };
            }),
            page: data.node.allPhotos.page_info,
          };
        }
        return {
          images: data.node.pageItems.edges.map(
            (item) => item.node.node.viewer_image
          ),
          page: data.node.pageItems.page_info,
        };
      });
  }
  window.scrollTo(0, document.body.scrollHeight);
  await sleep(1000);
  let cursor = null;
  const limit = +prompt("Số link tối đa sẽ lấy", "999999") || 999999;
  window.allImages = [];
  const { fb_dtsg, id } = findToken();
  const isPage = !!id.match(/^([0-9]+)$/);
  const method = isPage
    ? "PagesCometPhotosTabMainViewAllPhotosSectionPaginationQuery"
    : "ProfileCometAppCollectionPhotosRendererPaginationQuery";
  const doc_id = await findDocId(method);
  if (!fb_dtsg || !doc_id) {
    throw new Error("Không tìm thấy token");
  }
  console.log("%cBắt đầu lấy link", "color: green;");
  while (true) {
    let { images, page } = await getLinks(
      { fb_dtsg, id, doc_id, isPage, method },
      cursor ? `"${cursor}"` : null
    );
    window.allImages.push(...images);
    console.log("%cĐã lấy được %d link ảnh", "color: green;", window.allImages.length);
    // await sleep(1000); // sleep 1s
    if (!page.has_next_page) {
      break;
    }
    cursor = page.end_cursor;
    if (++window.allImages.length > limit) {
      break;
    }
  }
  console.log(window.allImages);
  const styles = ["color: green", "font-size: 20px", "padding: 10px"].join(";");

  console.log(
    "%cĐã lấy thành công %d link ảnh, gõ copy(window.allImages.map(({ uri }) => uri).join('\\n')) để sao chép links vào clipboard",
    styles,
    window.allImages.length
  );
})().catch((error) => {
  console.log(error);
  alert("Vui lòng tải lại trang và thử lại.");
});