Google Spreadsheet script that lists all the shared documents inside a specified folder and all its subfolders recursively. Skips out the documents shared internally (with specified email addresses)

listGoogleDriveSharedDocuments.js

function start() {
  const sheet = SpreadsheetApp.getActiveSheet();
  sheet.appendRow(["Name", "Sharing Access", "Sharing Permission", "Get Editors", "Get Viewers", "Date", "Size", "URL", "Download", "Description", "Type"]);

  const folder = DriveApp.getRootFolder();
 
  recursiveListSharedFiles(folder, sheet);
}

function recursiveListSharedFiles(folder, sheet) {
  listSharedFiles(folder, sheet);

  const subfolders = folder.getFolders();

  while (subfolders.hasNext()) {
    recursiveListSharedFiles(subfolders.next(), sheet);
  }
}

function listSharedFiles(folder, sheet) {
  const files = folder.getFiles();

  while (files.hasNext()) {
    const file = files.next();
    const externalEditorEmails = filterInternalEditors(file);

    if (isOnlySharedInternally(externalEditorEmails, file)) {
      continue;
    }

    appendRow(externalEditorEmails, file, sheet)
  }
}

function filterInternalEditors(file) {
  const internalEmails = [
    "your.own@email.com",
    "your.own@email2.com"
  ];

  const editorEmails = file.getEditors().map(e => e.getEmail());

  return editorEmails.filter(editorEmail => !internalEmails.includes(editorEmail));
}

function isOnlySharedInternally(externalEditorEmails, file) {
  return externalEditorEmails.length === 0
    && file.getViewers().length === 0
    && file.getSharingAccess() === DriveApp.Access.PRIVATE;
}

function appendRow(editorEmails, file, sheet) {
  const viewerEmails = file.getViewers().map(v => v.getEmail());

  data = [
    file.getName(),
    file.getSharingAccess(),
    file.getSharingPermission(),
    editorEmails.toString(),
    viewerEmails.toString(),
    file.getDateCreated(),
    file.getSize(),
    file.getUrl(),
    "https://docs.google.com/uc?export=download&confirm=no_antivirus&id=" + file.getId(),
    file.getDescription(),
    file.getMimeType(),
  ];

  sheet.appendRow(data);
}