Unwanted unescaping of http url strings #355
Comments
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Wouldn't it make more sense to escape them with the character function, with backslashes instead of html codes? |
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I see what the issue is: |
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This is my tested recoding of this function. It completely removed the escaping functions, as they are not required anymore. What I am not sure about is, if inside quotes, backslashes should also quote the quote itself. Example: I can implement that, but it was not implemented before and I am not sure if the spec even allows that. This document states, that is is not implemented very often, so we could just stick to that? def parts(self):
"""
Split the content line up into (name, parameters, values) parts.
Example with parameter:
DESCRIPTION;ALTREP="cid:part1.0001@example.org":The Fall'98 Wild
Example without parameters:
DESCRIPTION:The Fall'98 Wild
https://icalendar.org/iCalendar-RFC-5545/3-2-property-parameters.html
"""
try:
st = self
name_split = None
value_split = None
in_quotes = False
# Any character can be escaped using a backslash, e.g.: "test\:test"
quote_character = False
for i, ch in enumerate(st):
# We can also quote using quotation marks. This ignores any output, until another quote appears.
if ch == '"':
in_quotes = not in_quotes
continue
# Ignore input, as we are currently in quotation mark quotes
if in_quotes:
continue
# Skip quoted character
if quote_character:
quote_character = False
continue
# The next character should be ignored
if ch == '\\':
quote_character = True
continue
# The name ends either after the parameter or value delimiter
if ch in ':;' and not name_split:
name_split = i
# The value starts after the value delimiter
if ch == ':' and not value_split:
value_split = i
# Get name
name = st[:name_split]
if not name:
raise ValueError('Key name is required')
validate_token(name)
# Check if parameters are empty
if not name_split or name_split + 1 == value_split:
raise ValueError('Invalid content line')
# Get parameters (text between ; and :)
params = Parameters.from_ical(st[name_split + 1: value_split],
strict=self.strict)
# Get the value after the :
values = st[value_split + 1:]
return (name, params, values)
except ValueError as exc:
raise ValueError(
"Content line could not be parsed into parts: '%s': %s"
% (self, exc)
) |
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Here is a VEVENT to test with: |
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And this is my code as monket patch, so people coming here via google can hotfix their library right now: # Monkey patch icalendar bug
# https://medium.com/@chipiga86/python-monkey-patching-like-a-boss-87d7ddb8098e
# https://github.com/collective/icalendar/issues/355
from icalendar.parser import validate_token
from icalendar.parser import Parameters
def parts_patched(self):
"""
Split the content line up into (name, parameters, values) parts.
Example with parameter:
DESCRIPTION;ALTREP="cid:part1.0001@example.org":The Fall'98 Wild
Example without parameters:
DESCRIPTION:The Fall'98 Wild
https://icalendar.org/iCalendar-RFC-5545/3-2-property-parameters.html
"""
try:
st = self
name_split = None
value_split = None
in_quotes = False
# Any character can be escaped using a backslash, e.g.: "test\:test"
quote_character = False
for i, ch in enumerate(st):
# We can also quote using quotation marks. This ignores any output, until another quote appears.
if ch == '"':
in_quotes = not in_quotes
continue
# Ignore input, as we are currently in quotation mark quotes
if in_quotes:
continue
# Skip quoted character
if quote_character:
quote_character = False
continue
# The next character should be ignored
if ch == '\\':
quote_character = True
continue
# The name ends either after the parameter or value delimiter
if ch in ':;' and not name_split:
name_split = i
# The value starts after the value delimiter
if ch == ':' and not value_split:
value_split = i
# Get name
name = st[:name_split]
if not name:
raise ValueError('Key name is required')
validate_token(name)
# Check if parameters are empty
if not name_split or name_split + 1 == value_split:
raise ValueError('Invalid content line')
# Get parameters (text between ; and :)
params = Parameters.from_ical(st[name_split + 1: value_split],
strict=self.strict)
# Get the value after the :
values = st[value_split + 1:]
return (name, params, values)
except ValueError as exc:
raise ValueError(
"Content line could not be parsed into parts: '%s': %s"
% (self, exc)
)
from icalendar import parser
parser.Contentline.parts = parts_patched
# End of monkey patch |
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@NicoHood Would it be ok for you to create a pull request for this? It could be just the code. I am not a contributor to this project but willing to look at it. |
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Sure. #356 |
niccokunzmann
changed the title
Hi!
I have an url in my ical event description that is already html encoded. Here is an example:
This is how it looks in the ical file:
But some characters now get unescaped for some unknown reason:
It turns out, that this code causes the issue:
https://github.com/collective/icalendar/blob/master/src/icalendar/parser.py#L273
It converts
%3Ato:which in my case is NOT wanted. The url is broken then.Why was this html unescape introduced and how can we fix that?
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