#!/usr/bin/env python2.4 """ libxslt_web - XSLT Extension Functions for the HTML Web This is a set of XSLT extension functions that give access to HTTP mechanisms and HTML documents (even those that are invalid) on the Web. In particular, it offers; - GET and POST support, with control over the POST body and content-type - Automatic HTTP cookie and redirect handling - SSL (when supported by urllib2) The functions exposed are: get(uri) - GET the uri; returns a string of the response representation. post(uri, body, [content-type]) - post the body to the URI; returns a string of the response representation. tidy_parse(instr) - parse html and return a nodeset. to_string(node) - return the node serialised as a string. form_encode(node) - return the arguments serialised as a urlencoded form. Responses to HTTP methods return a nodeset with an arbitrary number of 'header' elements, one for each HTTP response header, and a single 'body' element. The header element has a single attribute, 'name', which contains the lowercased header field-name. For example;

Private

Tue, 18 Oct 2005 22:38:52 GMT

... body content here... Forms are similarly handled; my_username my_password and passed to form_encode. See the test() function for a demonstration. Requires Python 2.4, libxml2, libxslt and mxTidy. TODO: - return respnose status - PUT and DELETE - authentication support (basic, digest) - base64 of binary content (?) """ __license__ = """ Copyright (c) 2005 Mark Nottingham Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. """ __version__ = "0.2" import string, urllib, urllib2, tempfile, cookielib import libxml2, libxslt # http://xmlsoft.org/ from mx import Tidy # http://www.egenix.com/files/python/mxTidy.html EXT_NS = "http://mnot.net/libxslt_web/1.0" parse_options = libxml2.HTML_PARSE_RECOVER + libxml2.HTML_PARSE_NOERROR + libxml2.HTML_PARSE_NOWARNING # set up cookie handling cookie_policy = cookielib.DefaultCookiePolicy(rfc2965=True) cookie_jar = cookielib.CookieJar(cookie_policy) cookie_handler = urllib2.HTTPCookieProcessor(cookie_jar) opener = urllib2.build_opener(cookie_handler) urllib2.install_opener(opener) def get(ctx, uri): """ Extension function to perform a HTTP GET. """ if type(uri) == type([]): node = libxml2.xmlNode(_obj=uri[0]) uri = node.getContent() res = urllib2.urlopen(uri) root = libxml2.newNode('response') for name, value in res.headers.dict.items(): hdr = root.newTextChild(None, 'header', value) hdr.setProp('name', name.lower()) root.newTextChild(None, 'body', res.read()) return [root] def post(ctx, uri, body, content_type='application/x-www-form-urlencoded'): """ Extension function to perform a HTTP POST. """ if type(uri) == type([]): node = libxml2.xmlNode(_obj=uri[0]) uri = node.getContent() if type(body) == type([]): node = libxml2.xmlNode(_obj=body[0]) body = node.getContent() headers = {'Content-Type': content_type} req = urllib2.Request(uri, body, headers) res = urllib2.urlopen(req).read() root = libxml2.newNode('response') for name, value in res.headers.dict.items(): hdr = root.newTextChild(None, 'header', value) hdr.setProp('name', name.lower()) root.newTextChild(None, 'body', res.read()) return [root] def tidy_parse(ctx, content): """ Extension function to Tidy a string into a tree of XML nodes. """ if type(content) == type([]): node = libxml2.xmlNode(_obj=content[0]) content = node.getContent() tmp = tempfile.NamedTemporaryFile() try: content.replace(" ", " ") content.replace(" ", " ") result = Tidy.tidy(content, output=tmp.file, output_xhtml=1, quote_ampersand=0, numeric_entities=0, output_error=0) tmp.flush() doc = libxml2.htmlReadFile(tmp.name, None, parse_options) root = doc.getRootElement() root.unlinkNode() return [root] finally: tmp.close() def to_string(ctx, content): """ Extension function to serialise an XML node into a string. """ if type(content) == type([]): node = libxml2.xmlNode(_obj=content[0]) content = node.getContent() node = libxml2.xmlNode(_obj=content[0]) return str(node) def form_encode(ctx, content): """ Extension function to form-encode a string. """ args = [] if type(content) == type([]): node = libxml2.xmlNode(_obj=content[0]) content = node.getContent() for node in content: arg = libxml2.xmlNode(_obj=node) print "*", arg.name, arg.prop('name'), arg.getContent() if arg.name != 'arg': continue args.append((arg.prop('name'), arg.getContent())) return urllib.urlencode(args) libxslt.registerExtModuleFunction("tidy_parse", EXT_NS, tidy_parse) libxslt.registerExtModuleFunction("to_string", EXT_NS, to_string) libxslt.registerExtModuleFunction("get", EXT_NS, get) libxslt.registerExtModuleFunction("post", EXT_NS, post) libxslt.registerExtModuleFunction("form_encode", EXT_NS, form_encode) def test(): styledoc = libxml2.parseDoc(""" 1 2 3

""") style = libxslt.parseStylesheetDoc(styledoc) doc = libxml2.parseDoc("") result = style.applyStylesheet(doc, {}) style.freeStylesheet() doc.freeDoc() print result def run(instance, stylesheet, params={}): style = libxslt.parseStylesheetFile(stylesheet) doc = libxml2.parseFile(instance) result = style.applyStylesheet(doc, params) doc.freeDoc() return result def usage(): import sys sys.stderr.write("%s instance stylesheet [param=value...]\n" % sys.argv[0]) sys.exit(1) if __name__ == "__main__": import sys # test(); sys.exit(0) # uncomment to run test() try: instance, stylesheet = sys.argv[1:3] except: usage() params = {} for param in sys.argv[3:]: try: key, value = param.split('=', 1) params[key] = value except: usage() print run(instance, stylesheet, params)