text: from flask import Flask, request, jsonify
  from exception import SignatureException
  import file_handler as fh
  import os
  from dotenv import load_dotenv
  import bugsnag
  from bugsnag.flask import handle_exceptions
  
  
  app = Flask(__name__)
  app.secret_key = "secret key"
  app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024  # 16MB max image size
  
  IMG_FILE = 'img'
  IMG_FILE64 = 'img64'
  IMG_FILE_BYTES = 'img_bytes'
  IMG_RESPONSE_ENCODING = 'resp_enc'
  IMG_SIZES = 'img_sizes'
  ALLOWED_KEYS = (IMG_FILE, IMG_FILE64, IMG_FILE_BYTES)
  ALLOWED_EXTENSIONS = ('png', 'jpg', 'jpeg')
  
  load_dotenv()
  STAGE = os.environ.get("STAGE", os.environ.get("FLASK_ENV", "development"))
  if STAGE != "development" and "BUGSNAG_API_KEY" in os.environ and os.environ.get("BUGSNAG_API_KEY"):
      bugsnag.configure(
          api_key=os.environ.get("BUGSNAG_API_KEY"),
          project_root="",
          app_version="0.0.1",
          release_stage=STAGE,
      )
      handle_exceptions(app)
  
  
  def allowed_file(filename):
      return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
  
  
  def get_value(k):
      if request.form is not None and k in request.form:
          return request.form[k]
      if request.json is not None and k in request.json:
          return request.json[k]
      return None
  
  
  def is_file():
      return IMG_FILE in request.files
  
  
  def is_file64():
      return get_value(IMG_FILE64) is not None
  
  
  def is_file_bytes():
      return get_value(IMG_FILE_BYTES) is not None
  
  
  def get_response_encoding():
      return get_value(IMG_RESPONSE_ENCODING) or fh.ENCODING_BASE64
  
  
  def get_img_sizes():
      return get_value(IMG_SIZES) or {"img": (500, 50)}
  
  
  def create_response(imgs):
      resp = jsonify(imgs)
      resp.status_code = 201
      return resp
  
  
  def handle_file():
      file = request.files[IMG_FILE]
      if file.filename == '':
          resp = jsonify({'message': 'No file selected for uploading'})
          resp.status_code = 400
          return resp
      if file and allowed_file(file.filename):
          imgs = fh.get_from_file(request.files[IMG_FILE], get_response_encoding(), get_img_sizes())
          return create_response(imgs)
      else:
          resp = jsonify({'message': 'Allowed file types are {0}'.format(ALLOWED_EXTENSIONS)})
          resp.status_code = 400
          return resp
  
  
  @app.route('/extract-signature', methods=['POST'])
  def extract_signature():
      if is_file():
          return handle_file()
  
      elif is_file64():
          file64 = get_value(IMG_FILE64)
          imgs = fh.get_from_base64(file64, get_response_encoding(), get_img_sizes())
          return create_response(imgs)
  
      elif is_file_bytes():
          file_bytes = get_value(IMG_FILE_BYTES)
          imgs = fh.get_from_bytes(file_bytes, get_response_encoding(), get_img_sizes())
          return create_response(imgs)
  
      resp = jsonify({'message': 'No image in the request. Use {} in either form or json request'.format(ALLOWED_KEYS)})
      resp.status_code = 400
      return resp
  
  
  @app.errorhandler(SignatureException)
  def handle_image_exception(error):
      out = error.to_dict(get_response_encoding())
      response = jsonify(out)
      response.status_code = error.status_code
      return response
  
  
  @app.errorhandler(Exception)
  def handle_exception(e):
      bugsnag.notify(e)
      resp = jsonify({"errors": [{"error_code": "unexpected_error", "message": "An error has occurred while processing the image. Please try again in a few moments."}]})
      resp.status_code = 500
      return resp
  
  
  if __name__ == "__main__":
      app.run(host="0.0.0.0", port="7000")
  