Function postGetUrl

scripts/insta_injectDownloadBtn.js:455–535

(target, articleNode)

        }

        async function postGetUrl(target, articleNode) {
          // meta[property="og:video"]
          let list = articleNode.querySelectorAll("li[style][class]");
          let url = null;
          let mediaIndex = 0;
          if (list.length === 0) {
            // single img or video
            if (!disableNewUrlFetchMethod)
              url = await getUrlFromInfoApi(articleNode);
            if (url === null) {
              let videoElem = articleNode.querySelector("video");
              if (videoElem) {
                // media type is video
                url = videoElem.getAttribute("src");
                if (videoElem.hasAttribute("videoURL")) {
                  url = videoElem.getAttribute("videoURL");
                } else if (url === null || url.includes("blob")) {
                  url = await fetchVideoURL(articleNode, videoElem);
                }
              } else if (
                articleNode.querySelector("article  div[role] div > img")
              ) {
                // media type is image
                url = articleNode
                  .querySelector("article  div[role] div > img")
                  .getAttribute("src");
              } else {
                console.log("Err: not find media at handle post single");
              }
            }
          } else {
            // multiple imgs or videos
            const postView = location.pathname.startsWith("/p/");
            let dotsElements = [...articleNode.querySelectorAll(`div._acnb`)];
            mediaIndex = [...dotsElements].reduce(
              (result, element, index) =>
                element.classList.length === 2 ? index : result,
              null
            );
            if (mediaIndex === null) throw "Cannot find the media index";

            if (!disableNewUrlFetchMethod)
              url = await getUrlFromInfoApi(articleNode, mediaIndex);
            if (url === null) {
              const listElements = [
                ...articleNode.querySelectorAll(
                  `:scope > div > div:nth-child(${
                    postView ? 1 : 2
                  }) > div > div:nth-child(1) ul li[style*="translateX"]`
                ),
              ];
              const listElementWidth = Math.max(
                ...listElements.map((element) => element.clientWidth)
              );

              const positionsMap = listElements.reduce((result, element) => {
                const position = Math.round(
                  Number(element.style.transform.match(/-?(\d+)/)[1]) /