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455 lines
14 KiB
Python
455 lines
14 KiB
Python
r"""plistlib.py -- a tool to generate and parse MacOSX .plist files.
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The property list (.plist) file format is a simple XML pickle supporting
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basic object types, like dictionaries, lists, numbers and strings.
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Usually the top level object is a dictionary.
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To write out a plist file, use the writePlist(rootObject, pathOrFile)
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function. 'rootObject' is the top level object, 'pathOrFile' is a
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filename or a (writable) file object.
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To parse a plist from a file, use the readPlist(pathOrFile) function,
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with a file name or a (readable) file object as the only argument. It
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returns the top level object (again, usually a dictionary).
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To work with plist data in bytes objects, you can use readPlistFromBytes()
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and writePlistToBytes().
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Values can be strings, integers, floats, booleans, tuples, lists,
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dictionaries (but only with string keys), Data or datetime.datetime objects.
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String values (including dictionary keys) have to be unicode strings -- they
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will be written out as UTF-8.
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The <data> plist type is supported through the Data class. This is a
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thin wrapper around a Python bytes object. Use 'Data' if your strings
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contain control characters.
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Generate Plist example:
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pl = dict(
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aString = "Doodah",
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aList = ["A", "B", 12, 32.1, [1, 2, 3]],
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aFloat = 0.1,
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anInt = 728,
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aDict = dict(
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anotherString = "<hello & hi there!>",
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aUnicodeValue = "M\xe4ssig, Ma\xdf",
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aTrueValue = True,
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aFalseValue = False,
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),
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someData = Data(b"<binary gunk>"),
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someMoreData = Data(b"<lots of binary gunk>" * 10),
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aDate = datetime.datetime.fromtimestamp(time.mktime(time.gmtime())),
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)
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writePlist(pl, fileName)
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Parse Plist example:
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pl = readPlist(pathOrFile)
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print pl["aKey"]
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"""
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__all__ = [
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"readPlist", "writePlist", "readPlistFromBytes", "writePlistToBytes",
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"Plist", "Data", "Dict"
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]
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# Note: the Plist and Dict classes have been deprecated.
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import binascii
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import datetime
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from io import BytesIO
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import re
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def readPlist(pathOrFile):
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"""Read a .plist file. 'pathOrFile' may either be a file name or a
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(readable) file object. Return the unpacked root object (which
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usually is a dictionary).
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"""
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didOpen = False
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try:
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if isinstance(pathOrFile, str):
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pathOrFile = open(pathOrFile, 'rb')
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didOpen = True
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p = PlistParser()
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rootObject = p.parse(pathOrFile)
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finally:
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if didOpen:
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pathOrFile.close()
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return rootObject
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def writePlist(rootObject, pathOrFile):
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"""Write 'rootObject' to a .plist file. 'pathOrFile' may either be a
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file name or a (writable) file object.
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"""
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didOpen = False
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try:
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if isinstance(pathOrFile, str):
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pathOrFile = open(pathOrFile, 'wb')
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didOpen = True
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writer = PlistWriter(pathOrFile)
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writer.writeln("<plist version=\"1.0\">")
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writer.writeValue(rootObject)
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writer.writeln("</plist>")
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finally:
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if didOpen:
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pathOrFile.close()
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def readPlistFromBytes(data):
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"""Read a plist data from a bytes object. Return the root object.
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"""
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return readPlist(BytesIO(data))
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def writePlistToBytes(rootObject):
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"""Return 'rootObject' as a plist-formatted bytes object.
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"""
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f = BytesIO()
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writePlist(rootObject, f)
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return f.getvalue()
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class DumbXMLWriter:
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def __init__(self, file, indentLevel=0, indent="\t"):
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self.file = file
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self.stack = []
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self.indentLevel = indentLevel
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self.indent = indent
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def beginElement(self, element):
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self.stack.append(element)
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self.writeln("<%s>" % element)
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self.indentLevel += 1
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def endElement(self, element):
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assert self.indentLevel > 0
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assert self.stack.pop() == element
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self.indentLevel -= 1
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self.writeln("</%s>" % element)
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def simpleElement(self, element, value=None):
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if value is not None:
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value = _escape(value)
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self.writeln("<%s>%s</%s>" % (element, value, element))
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else:
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self.writeln("<%s/>" % element)
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def writeln(self, line):
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if line:
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# plist has fixed encoding of utf-8
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if isinstance(line, str):
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line = line.encode('utf-8')
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self.file.write(self.indentLevel * self.indent)
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self.file.write(line)
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self.file.write(b'\n')
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# Contents should conform to a subset of ISO 8601
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# (in particular, YYYY '-' MM '-' DD 'T' HH ':' MM ':' SS 'Z'. Smaller units may be omitted with
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# a loss of precision)
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_dateParser = re.compile(r"(?P<year>\d\d\d\d)(?:-(?P<month>\d\d)(?:-(?P<day>\d\d)(?:T(?P<hour>\d\d)(?::(?P<minute>\d\d)(?::(?P<second>\d\d))?)?)?)?)?Z", re.ASCII)
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def _dateFromString(s):
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order = ('year', 'month', 'day', 'hour', 'minute', 'second')
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gd = _dateParser.match(s).groupdict()
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lst = []
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for key in order:
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val = gd[key]
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if val is None:
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break
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lst.append(int(val))
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return datetime.datetime(*lst)
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def _dateToString(d):
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return '%04d-%02d-%02dT%02d:%02d:%02dZ' % (
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d.year, d.month, d.day,
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d.hour, d.minute, d.second
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)
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# Regex to find any control chars, except for \t \n and \r
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_controlCharPat = re.compile(
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r"[\x00\x01\x02\x03\x04\x05\x06\x07\x08\x0b\x0c\x0e\x0f"
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r"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f]")
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def _escape(text):
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m = _controlCharPat.search(text)
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if m is not None:
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raise ValueError("strings can't contains control characters; "
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"use plistlib.Data instead")
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text = text.replace("\r\n", "\n") # convert DOS line endings
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text = text.replace("\r", "\n") # convert Mac line endings
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text = text.replace("&", "&") # escape '&'
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text = text.replace("<", "<") # escape '<'
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text = text.replace(">", ">") # escape '>'
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return text
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PLISTHEADER = b"""\
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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"""
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class PlistWriter(DumbXMLWriter):
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def __init__(self, file, indentLevel=0, indent=b"\t", writeHeader=1):
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if writeHeader:
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file.write(PLISTHEADER)
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DumbXMLWriter.__init__(self, file, indentLevel, indent)
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def writeValue(self, value):
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if isinstance(value, str):
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self.simpleElement("string", value)
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elif isinstance(value, bool):
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# must switch for bool before int, as bool is a
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# subclass of int...
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if value:
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self.simpleElement("true")
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else:
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self.simpleElement("false")
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elif isinstance(value, int):
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self.simpleElement("integer", "%d" % value)
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elif isinstance(value, float):
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self.simpleElement("real", repr(value))
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elif isinstance(value, dict):
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self.writeDict(value)
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elif isinstance(value, Data):
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self.writeData(value)
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elif isinstance(value, datetime.datetime):
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self.simpleElement("date", _dateToString(value))
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elif isinstance(value, (tuple, list)):
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self.writeArray(value)
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else:
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raise TypeError("unsupported type: %s" % type(value))
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def writeData(self, data):
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self.beginElement("data")
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self.indentLevel -= 1
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maxlinelength = 76 - len(self.indent.replace(b"\t", b" " * 8) *
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self.indentLevel)
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for line in data.asBase64(maxlinelength).split(b"\n"):
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if line:
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self.writeln(line)
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self.indentLevel += 1
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self.endElement("data")
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def writeDict(self, d):
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if d:
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self.beginElement("dict")
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items = sorted(d.items())
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for key, value in items:
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if not isinstance(key, str):
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raise TypeError("keys must be strings")
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self.simpleElement("key", key)
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self.writeValue(value)
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self.endElement("dict")
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else:
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self.simpleElement("dict")
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def writeArray(self, array):
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if array:
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self.beginElement("array")
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for value in array:
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self.writeValue(value)
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self.endElement("array")
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else:
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self.simpleElement("array")
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class _InternalDict(dict):
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# This class is needed while Dict is scheduled for deprecation:
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# we only need to warn when a *user* instantiates Dict or when
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# the "attribute notation for dict keys" is used.
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def __getattr__(self, attr):
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try:
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value = self[attr]
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except KeyError:
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raise AttributeError(attr)
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from warnings import warn
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warn("Attribute access from plist dicts is deprecated, use d[key] "
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"notation instead", DeprecationWarning, 2)
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return value
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def __setattr__(self, attr, value):
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from warnings import warn
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warn("Attribute access from plist dicts is deprecated, use d[key] "
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"notation instead", DeprecationWarning, 2)
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self[attr] = value
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def __delattr__(self, attr):
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try:
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del self[attr]
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except KeyError:
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raise AttributeError(attr)
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from warnings import warn
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warn("Attribute access from plist dicts is deprecated, use d[key] "
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"notation instead", DeprecationWarning, 2)
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class Dict(_InternalDict):
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def __init__(self, **kwargs):
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from warnings import warn
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warn("The plistlib.Dict class is deprecated, use builtin dict instead",
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DeprecationWarning, 2)
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super().__init__(**kwargs)
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class Plist(_InternalDict):
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"""This class has been deprecated. Use readPlist() and writePlist()
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functions instead, together with regular dict objects.
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"""
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def __init__(self, **kwargs):
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from warnings import warn
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warn("The Plist class is deprecated, use the readPlist() and "
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"writePlist() functions instead", DeprecationWarning, 2)
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super().__init__(**kwargs)
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def fromFile(cls, pathOrFile):
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"""Deprecated. Use the readPlist() function instead."""
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rootObject = readPlist(pathOrFile)
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plist = cls()
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plist.update(rootObject)
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return plist
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fromFile = classmethod(fromFile)
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def write(self, pathOrFile):
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"""Deprecated. Use the writePlist() function instead."""
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writePlist(self, pathOrFile)
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def _encodeBase64(s, maxlinelength=76):
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# copied from base64.encodebytes(), with added maxlinelength argument
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maxbinsize = (maxlinelength//4)*3
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pieces = []
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for i in range(0, len(s), maxbinsize):
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chunk = s[i : i + maxbinsize]
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pieces.append(binascii.b2a_base64(chunk))
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return b''.join(pieces)
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class Data:
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"""Wrapper for binary data."""
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def __init__(self, data):
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if not isinstance(data, bytes):
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raise TypeError("data must be as bytes")
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self.data = data
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@classmethod
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def fromBase64(cls, data):
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# base64.decodebytes just calls binascii.a2b_base64;
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# it seems overkill to use both base64 and binascii.
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return cls(binascii.a2b_base64(data))
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def asBase64(self, maxlinelength=76):
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return _encodeBase64(self.data, maxlinelength)
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def __eq__(self, other):
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if isinstance(other, self.__class__):
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return self.data == other.data
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elif isinstance(other, str):
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return self.data == other
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else:
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return id(self) == id(other)
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def __repr__(self):
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return "%s(%s)" % (self.__class__.__name__, repr(self.data))
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class PlistParser:
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def __init__(self):
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self.stack = []
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self.currentKey = None
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self.root = None
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def parse(self, fileobj):
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from xml.parsers.expat import ParserCreate
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self.parser = ParserCreate()
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self.parser.StartElementHandler = self.handleBeginElement
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self.parser.EndElementHandler = self.handleEndElement
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self.parser.CharacterDataHandler = self.handleData
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self.parser.ParseFile(fileobj)
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return self.root
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def handleBeginElement(self, element, attrs):
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self.data = []
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handler = getattr(self, "begin_" + element, None)
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if handler is not None:
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handler(attrs)
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def handleEndElement(self, element):
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handler = getattr(self, "end_" + element, None)
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if handler is not None:
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handler()
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def handleData(self, data):
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self.data.append(data)
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def addObject(self, value):
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if self.currentKey is not None:
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if not isinstance(self.stack[-1], type({})):
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raise ValueError("unexpected element at line %d" %
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self.parser.CurrentLineNumber)
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self.stack[-1][self.currentKey] = value
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self.currentKey = None
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elif not self.stack:
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# this is the root object
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self.root = value
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else:
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if not isinstance(self.stack[-1], type([])):
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raise ValueError("unexpected element at line %d" %
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self.parser.CurrentLineNumber)
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self.stack[-1].append(value)
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def getData(self):
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data = ''.join(self.data)
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self.data = []
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return data
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# element handlers
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def begin_dict(self, attrs):
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d = _InternalDict()
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self.addObject(d)
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self.stack.append(d)
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def end_dict(self):
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if self.currentKey:
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raise ValueError("missing value for key '%s' at line %d" %
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(self.currentKey,self.parser.CurrentLineNumber))
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self.stack.pop()
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def end_key(self):
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if self.currentKey or not isinstance(self.stack[-1], type({})):
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raise ValueError("unexpected key at line %d" %
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self.parser.CurrentLineNumber)
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self.currentKey = self.getData()
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def begin_array(self, attrs):
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a = []
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self.addObject(a)
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self.stack.append(a)
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def end_array(self):
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self.stack.pop()
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def end_true(self):
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self.addObject(True)
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def end_false(self):
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self.addObject(False)
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def end_integer(self):
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self.addObject(int(self.getData()))
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def end_real(self):
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self.addObject(float(self.getData()))
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def end_string(self):
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self.addObject(self.getData())
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def end_data(self):
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self.addObject(Data.fromBase64(self.getData().encode("utf-8")))
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def end_date(self):
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self.addObject(_dateFromString(self.getData()))
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