redesignedVersion static method

String? redesignedVersion(Document response)

Return field version from Redesigned Play Store results.

Implementation

static String? redesignedVersion(Document response) {
  String? version;
  try {
    const patternName = ",\"name\":\"";
    const patternVersion = ",[[[\"";
    const patternCallback = "AF_initDataCallback";
    const patternEndOfString = "\"";

    final scripts = response.getElementsByTagName("script");
    final infoElements =
        scripts.where((element) => element.text.contains(patternName));
    final additionalInfoElements =
        scripts.where((element) => element.text.contains(patternCallback));
    final additionalInfoElementsFiltered = additionalInfoElements
        .where((element) => element.text.contains(patternVersion));

    final nameElement = infoElements.first.text;
    final storeNameStartIndex =
        nameElement.indexOf(patternName) + patternName.length;
    final storeNameEndIndex = storeNameStartIndex +
        nameElement
            .substring(storeNameStartIndex)
            .indexOf(patternEndOfString);
    final storeName =
        nameElement.substring(storeNameStartIndex, storeNameEndIndex);

    final versionElement = additionalInfoElementsFiltered
        .where((element) => element.text.contains("\"$storeName\""))
        .first
        .text;
    final storeVersionStartIndex =
        versionElement.lastIndexOf(patternVersion) + patternVersion.length;
    final storeVersionEndIndex = storeVersionStartIndex +
        versionElement
            .substring(storeVersionStartIndex)
            .indexOf(patternEndOfString);
    final storeVersion = versionElement.substring(
        storeVersionStartIndex, storeVersionEndIndex);

    // storeVersion might be: 'Varies with device', which is not a valid version.
    version = Version.parse(storeVersion).toString();
  } catch (e) {
    print('upgrader: PlayStoreResults.redesignedVersion exception: $e');
  }

  return version;
}