/* Credit: https://gist.github.com/tagplus5 */

function doGet(request) {
  var status;

  if (request.parameters.url !== undefined && request.parameters.url !== '') {
    try {
      // Fetch the image data from the web
      var imageBlob = UrlFetchApp.fetch(request.parameters.url).getBlob();

      var resource = {
        title: imageBlob.getName(),
        mimeType: imageBlob.getContentType(),
      };

      // OCR on .jpg, .png, .gif, or .pdf uploads
      var options = {
        ocr: true,
      };

      var docFile = Drive.Files.insert(resource, imageBlob, options);

      var doc = DocumentApp.openById(docFile.id);

      // Extract the text body of the Google Document
      var text = doc.getBody().getText().replace('n', '');

      // Send the document to trash
      Drive.Files.remove(docFile.id);

      status = text;
    } catch (error) {
      status = 'ERROR: ' + error.toString();
    }
  } else {
    status = 'ERROR: No image url specified in the HTTP request';
  }

  return ContentService.createTextOutput(status);
}