old_contents: from flask import render_template, request
  from nanobox_libcloud import app
  from nanobox_libcloud.adapters import get_adapter
  from nanobox_libcloud.adapters.base import AdapterBase
  from nanobox_libcloud.utils import output
  
  
  # Overview and usage endpoints, to explain how this meta-adapter works
  @app.route('/', methods=['GET'])
  def overview():
      """Provides an overview of the libcloud meta-adapter, and how to use it, in the most general sense."""
      adapters = AdapterBase.registry.keys()
  
      return render_template("overview.html", adapters=adapters)
  
  
  @app.route('/<adapter_id>', methods=['GET'])
  def usage(adapter_id):
      """Provides usage info for a certain adapter, and how to use it, in a more specific sense."""
      adapter = get_adapter(adapter_id)
  
      if not adapter:
          return output.failure("That adapter doesn't (yet) exist. Please check the adapter name and try again.", 501)
  
      return render_template("usage.html", adapter=adapter)
  
  
  # Actual metadata endpoints for the Nanobox Provider Adapter API
  @app.route('/<adapter_id>/meta', methods=['GET'])
  def meta(adapter_id):
      """Provides the metadata for a certain adapter."""
      adapter = get_adapter(adapter_id)
  
      if not adapter:
          return output.failure("That adapter doesn't (yet) exist. Please check the adapter name and try again.", 501)
  
      return output.success(adapter.do_meta())
  
  
  @app.route('/<adapter_id>/catalog', methods=['GET'])
  def catalog(adapter_id):
      """Provides the catalog data for a certain adapter."""
      adapter = get_adapter(adapter_id)
  
      if not adapter:
          return output.failure("That adapter doesn't (yet) exist. Please check the adapter name and try again.", 501)
  
      result = adapter.do_catalog()
      if not isinstance(result, dict):
          return output.failure(result.message if hasattr(result, 'message') else repr(result), 500)
  
      return output.success(result)
  
  
  @app.route('/<adapter_id>/verify', methods=['POST'])
  def verify(adapter_id):
      """Verifies user credentials for a certain adapter."""
      adapter = get_adapter(adapter_id)
  
      if not adapter:
          return output.failure("That adapter doesn't (yet) exist. Please check the adapter name and try again.", 501)
  
      result = adapter.do_verify(request.headers)
      if result is not True:
          return output.failure("Credential verification failed. Please check your credentials and try again. (Error %s)" % (result), 401)
  
      return ""
  
new_contents: from flask import render_template, request
  from nanobox_libcloud import app
  from nanobox_libcloud.adapters import get_adapter
  from nanobox_libcloud.adapters.base import AdapterBase
  from nanobox_libcloud.utils import output
  
  
  # Overview and usage endpoints, to explain how this meta-adapter works
  @app.route('/', methods=['GET'])
  def overview():
      """Provides an overview of the libcloud meta-adapter, and how to use it, in the most general sense."""
      adapters = AdapterBase.registry.keys()
  
      return render_template("overview.html", adapters=adapters)
  
  
  @app.route('/<adapter_id>', methods=['GET'])
  def usage(adapter_id):
      """Provides usage info for a certain adapter, and how to use it, in a more specific sense."""
      adapter = get_adapter(adapter_id)
  
      if not adapter:
          return output.failure("That adapter doesn't (yet) exist. Please check the adapter name and try again.", 501)
  
      return render_template("usage.html", adapter=adapter)
  
  
  # Actual metadata endpoints for the Nanobox Provider Adapter API
  @app.route('/<adapter_id>/meta', methods=['GET'])
  def meta(adapter_id):
      """Provides the metadata for a certain adapter."""
      adapter = get_adapter(adapter_id)
  
      if not adapter:
          return output.failure("That adapter doesn't (yet) exist. Please check the adapter name and try again.", 501)
  
      return output.success(adapter.do_meta())
  
  
  @app.route('/<adapter_id>/catalog', methods=['GET'])
  def catalog(adapter_id):
      """Provides the catalog data for a certain adapter."""
      adapter = get_adapter(adapter_id)
  
      if not adapter:
          return output.failure("That adapter doesn't (yet) exist. Please check the adapter name and try again.", 501)
  
      result = adapter.do_catalog()
      if not isinstance(result, list):
          return output.failure(result.message if hasattr(result, 'message') else repr(result), 500)
  
      return output.success(result)
  
  
  @app.route('/<adapter_id>/verify', methods=['POST'])
  def verify(adapter_id):
      """Verifies user credentials for a certain adapter."""
      adapter = get_adapter(adapter_id)
  
      if not adapter:
          return output.failure("That adapter doesn't (yet) exist. Please check the adapter name and try again.", 501)
  
      result = adapter.do_verify(request.headers)
      if result is not True:
          return output.failure("Credential verification failed. Please check your credentials and try again. (Error %s)" % (result), 401)
  
      return ""
  
subject: Fix type check for `/catalog`