API Documentation

Classes

PythonScript

Functions

manage_addPythonScript

Classes

class PythonScript(Script)

Python Scripts contain python code that gets executed when you call the script by:

• Calling the script through the web by going to its location with a web browser.
• Calling the script from another script object.
• Calling the script from a method object, such as a DTML Method.

Python Scripts can contain a "safe" subset of the python language. Python Scripts must be safe because they can be potentially edited by many different users through an insecure medium like the web. The following safety issues drive the need for secure Python Scripts:

• Because many users can use Zope, a Python Script must make sure it does not allow a user to do something they are not allowed to do, like deleting an object they do not have permission to delete. Because of this requirement, Python Scripts do many security checks in the course of their execution.
• Because Python Scripts can be edited through the insecure medium of the web, they are not allowed access to the Zope server's file-system. Normal Python builtins like open are, therefore, not allowed.
• Because many standard Python modules break the above two security restrictions, only a small subset of Python modules may be imported into a Python Scripts with the "import" statement unless they have been validated by Zope's security policy. Currently, the following standard python modules have been validated:
  • string
  • math
  • whrandom and random
  • Products.PythonScripts.standard
• Because it allows you to execute arbitrary python code, the python "exec" statement is not allowed in Python methods.
• Because they may represent or cause security violations, some Python builtin functions are not allowed. The following Python builtins are not allowed:
  • open
  • input
  • raw_input
  • eval
  • execfile
  • compile
  • type
  • coerce
  • intern
  • dir
  • globals
  • locals
  • vars
  • buffer
  • reduce
• Other builtins are restricted in nature. The following builtins are restricted:

  range

  Due to possible memory denial of service attacks, the range builtin is restricted to creating ranges less than 10,000 elements long.

  filter, map, tuple, list

  For the same reason, builtins that construct lists from sequences do not operate on strings.

  getattr, setattr, delattr

  Because these may enable Python code to circumvent Zope's security system, they are replaced with custom, security constrained versions.

• In order to be consistent with the Python expressions available to DTML, the builtin functions are augmented with a small number of functions and a class:
  • test
  • namespace
  • render
  • same_type
  • DateTime
• Because the "print" statement cannot operate normally in Zope, its effect has been changed. Rather than sending text to stdout, "print" appends to an internal variable. The special builtin name "printed" evaluates to the concatenation of all text printed so far during the current execution of the script.

Product Constructor

manage_addPythonScript(id, REQUEST=None):

Add a Python script to a folder.

__module__ = __builtin__

Methods

write(text):

Change the script by parsing the text argument into parts. Leading lines that begin with ## are stripped off, and if they are of the form ##name=value, they are used to set meta-data such as the title and parameters. The remainder of the text is set as the body of the Python Script.

ZPythonScriptHTML_editAction(REQUEST, title, params, body):

Change the script's main parameters. This method accepts the following arguments:

REQUEST

The current request.

title

The new value of the Python Script's title. This must be a string.

params

The new value of the Python Script's parameters. Must be a comma seperated list of values in valid python function signature syntax. If it does not contain a valid signature string, a SyntaxError is raised.

body

The new value of the Python Script's body. Must contain valid Python syntax. If it does not contain valid Python syntax, a SyntaxError is raised.

read():

Return the body of the Python Script, with a special comment block prepended. This block contains meta-data in the form of comment lines as expected by the write method.

ZScriptHTML_tryParams():

Return a list of the required parameters with which to test the script.

ZPythonScript_setTitle(title):

Change the script's title. This method accepts one argument, title which is the new value for the script's title and must be a string.

ZPythonScriptHTML_upload(REQUEST, file=):

Pass the text in file to the write method.

ZPythonScript_edit(params, body):

Change the parameters and body of the script. This method accepts two arguments:

params

The new value of the Python Script's parameters. Must be a comma seperated list of values in valid python function signature syntax. If it does not contain a valid signature string, a SyntaxError is raised.

body

The new value of the Python Script's body. Must contain valid Python syntax. If it does not contain valid Python syntax, a SyntaxError is raised.

document_src(REQUEST=None, RESPONSE=None):

Return the text of the read method, with content type text/plain set on the RESPONSE.

Functions

manage_addPythonScript(id, REQUEST=None):

Add a Python script to a folder.