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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright: (2013-2017) Michael Till Beck <Debianguru@gmx.de>
# License: GPL-2.0+
import urllib.request
import urllib.error
import urllib.parse
import subprocess
from lxml import etree
from cssselect import GenericTranslator
import re
# Attributes in HTML files storing URI values. These values are automatically translated to absolute URIs.
uriAttributes = [['//img[@src]', 'src'], ['//a[@href]', 'href']]
maxTitleLength = 150
class Parser:
# input: [Content], output: [Content]
def performAction(self, contentList):
pass
class Receiver(Parser):
def __init__(self, uri):
self.uri = uri
class Content:
def __init__(self, uri, encoding, title, content, contenttype, additional=None):
self.uri = uri
self.encoding = encoding
self.title = title
self.content = content
self.contenttype = contenttype
self.additional = additional
# returns a short subject line
def getSubject(textContent):
global maxTitleLength
if textContent is None or len(textContent.strip()) == 0:
return 'Website has been updated'
textContent = re.sub(' +', ' ', re.sub('\s', ' ', textContent)).strip()
return (textContent[:maxTitleLength] + ' [..]') if len(textContent) > maxTitleLength else textContent
# translates all relative URIs found in trees to absolute URIs
def toAbsoluteURIs(trees, baseuri):
global uriAttributes
for tree in trees:
if isinstance(tree, str):
continue
for uriAttribute in uriAttributes:
tags = tree.xpath(uriAttribute[0])
for tag in tags:
if tag.attrib.get(uriAttribute[1]) is not None:
if urllib.parse.urlparse(tag.attrib[uriAttribute[1]]).scheme == '':
tag.attrib[uriAttribute[1]] = urllib.parse.urljoin(baseuri, tag.attrib[uriAttribute[1]])
class URLReceiver(Receiver):
def __init__(self, uri, contenttype='html', encoding='utf-8', userAgent=None, accept=None):
super().__init__(uri)
self.contenttype = contenttype
self.encoding = encoding
self.userAgent = userAgent
self.accept = accept
# input: [Content], output: [Content]
def performAction(self, contentList=None):
if contentList is None:
contentList = []
# open website
req = urllib.request.Request(self.uri)
if self.userAgent is not None:
req.add_header('User-Agent', self.userAgent)
if self.accept is not None:
req.add_header('Accept', self.accept)
with urllib.request.urlopen(req) as thefile:
filecontent = thefile.read().decode(self.encoding, errors='ignore')
contentList.append(Content(uri=self.uri, encoding=self.encoding, title=None, content=filecontent, contenttype=self.contenttype))
return contentList
class CommandReceiver(Receiver):
def __init__(self, command, contenttype='text', encoding='utf-8'):
super().__init__(command)
self.encoding = encoding
self.command = command
self.contenttype = contenttype
# input: [Content], output: [Content]
def performAction(self, contentList=None):
if contentList is None:
contentList = []
# run command and retrieve output
process = subprocess.Popen(self.command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True, close_fds=True)
thefile = process.stdout
result = thefile.read().decode(self.encoding, errors='ignore')
thefile.close()
if process.wait() != 0:
raise Exception("process terminated with an error: " + str(process.stderr) + "\n" + result)
contentList.append(Content(uri=None, encoding=self.encoding, title=None, content=result, contenttype=self.contenttype))
return contentList
class XPathParser(Parser):
def __init__(self, contentxpath, titlexpath=None):
self.contentxpath = contentxpath
self.titlexpath = titlexpath
# input: [Content], output: [Content]
def performAction(self, contentList):
result = []
for content in contentList:
result.extend(self.parseOneObject(content))
return result
# input: Content, output: [Content]
def parseOneObject(self, content):
baseuri = content.uri
if content.contenttype == 'html':
parser = etree.HTMLParser(encoding=content.encoding)
else:
parser = etree.XMLParser(recover=True, encoding=content.encoding)
tree = etree.fromstring(content.content, parser=parser)
# xpath
contentresult = [] if self.contentxpath is None else tree.xpath(self.contentxpath)
titleresult = [] if self.titlexpath is None else tree.xpath(self.titlexpath)
# translate relative URIs to absolute URIs
if content.contenttype == 'html':
basetaglist = tree.xpath('/html/head/base')
if len(basetaglist) != 0:
baseuri = basetaglist[0].attrib['href']
if len(contentresult) != 0:
toAbsoluteURIs(contentresult, baseuri)
if len(titleresult) != 0:
toAbsoluteURIs(titleresult, baseuri)
if self.contentxpath and len(contentresult) == 0:
raise Exception('WARNING: content selector became invalid!')
if self.titlexpath and len(titleresult) == 0:
raise Exception('WARNING: title selector became invalid!')
contents = []
titles = []
if isinstance(contentresult, str):
contents = [contentresult]
else:
if len(contentresult) == 0:
contentresult = titleresult
contents = [etree.tostring(s, encoding=content.encoding, pretty_print=True).decode(content.encoding, errors='ignore') for s in contentresult]
if isinstance(titleresult, str):
titles = [getSubject(titleresult)]*len(contents)
else:
if len(titleresult) == 0 or len(titleresult) != len(contentresult):
titleresult = contentresult
titles = [getSubject(etree.tostring(s, method='text', encoding=content.encoding).decode(content.encoding, errors='ignore')) for s in titleresult]
result = []
for i in range(0, len(contents)):
result.append(Content(uri=content.uri, encoding=content.encoding, title=titles[i], content=contents[i], contenttype=content.contenttype))
return result
class CSSParser(Parser):
def __init__(self, contentcss, titlecss=None):
contentxpath = GenericTranslator().css_to_xpath(contentcss)
titlexpath = None
if titlecss is not None:
titlexpath = GenericTranslator().css_to_xpath(titlecss)
self.xpathparser = XPathParser(contentxpath=contentxpath, titlexpath=titlexpath)
# input: [Content], output: [Content]
def performAction(self, contentList):
return self.xpathparser.performAction(contentList)
class RegExParser(Parser):
def __init__(self, contentregex, titleregex=None):
self.contentregex = contentregex
self.titleregex = titleregex
# input: [Content], output: [Content]
def performAction(self, contentList):
result = []
for content in contentList:
result.extend(self.parseOneObject(content))
return result
# input: Content, output: [Content]
def parseOneObject(self, content):
contents = []
titles = []
if self.contentregex is not None:
for c in re.findall(r'' + self.contentregex, content.content, re.M):
if len(c.strip()) != 0:
contents.append(c)
if self.titleregex is not None:
for c in re.findall(r'' + self.titleregex, content.title, re.M):
if len(c.strip()) != 0:
titles.append(c)
if self.contentregex is not None and len(contents) == 0:
raise Exception('WARNING: content regex became invalid!')
elif self.titleregex is not None and len(titles) == 0:
raise Exception('WARNING: title regex became invalid!')
else:
if len(contents) == 0:
contents = titles
if len(titles) == 0 or len(titles) != len(contents):
titles = [getSubject(c) for c in contents]
result = []
for i in range(0, len(contents)):
result.append(Content(uri=content.uri, encoding=content.encoding, title=titles[i], content=contents[i], contenttype=content.contenttype))
return result
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