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142 lines
3.7 KiB
Python
142 lines
3.7 KiB
Python
"""
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Assorted Hypothesis strategies useful for generating HTTP requests and responses
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"""
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from __future__ import unicode_literals
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from six.moves.urllib import parse
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import string
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from hypothesis import strategies
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HTTP_METHODS = ["OPTIONS", "GET", "HEAD", "POST", "PUT", "DELETE", "TRACE", "CONNECT"]
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# Unicode characters of the "Letter" category
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letters = strategies.characters(whitelist_categories=("Lu", "Ll", "Lt", "Lm", "Lo", "Nl"))
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def http_method():
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return strategies.sampled_from(HTTP_METHODS)
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def _http_path_portion():
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alphabet = string.ascii_letters + string.digits + "-._~"
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return strategies.text(min_size=1, average_size=10, max_size=128, alphabet=alphabet)
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def http_path():
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"""
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Returns a URL path (not encoded).
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"""
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return strategies.lists(
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_http_path_portion(),
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min_size=0,
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max_size=10,
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).map(lambda s: "/" + "/".join(s))
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def http_body():
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"""
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Returns random binary body data.
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"""
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return strategies.binary(min_size=0, average_size=600, max_size=1500)
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def valid_bidi(value):
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"""
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Rejects strings which nonsensical Unicode text direction flags.
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Relying on random Unicode characters means that some combinations don't make sense, from a
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direction of text point of view. This little helper just rejects those.
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"""
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try:
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value.encode("idna")
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except UnicodeError:
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return False
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else:
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return True
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def _domain_label():
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return strategies.text(
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alphabet=letters,
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min_size=1,
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average_size=6,
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max_size=63,
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).filter(valid_bidi)
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def international_domain_name():
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"""
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Returns a byte string of a domain name, IDNA-encoded.
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"""
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return strategies.lists(
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_domain_label(),
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min_size=2,
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average_size=2,
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).map(lambda s: (".".join(s)).encode("idna"))
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def _query_param():
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return strategies.text(
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alphabet=letters,
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min_size=1,
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average_size=10,
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max_size=255,
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).map(lambda s: s.encode("utf8"))
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def query_params():
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"""
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Returns a list of two-tuples byte strings, ready for encoding with urlencode.
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We're aiming for a total length of a URL below 2083 characters, so this strategy
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ensures that the total urlencoded query string is not longer than 1500 characters.
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"""
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return strategies.lists(
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strategies.tuples(_query_param(), _query_param()),
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min_size=0,
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average_size=5,
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).filter(lambda x: len(parse.urlencode(x)) < 1500)
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def header_name():
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"""
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Strategy returning something that looks like a HTTP header field
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https://en.wikipedia.org/wiki/List_of_HTTP_header_fields suggests they are between 4
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and 20 characters long
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"""
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return strategies.text(
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alphabet=string.ascii_letters + string.digits + "-",
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min_size=1,
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max_size=30,
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)
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def header_value():
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"""
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Strategy returning something that looks like a HTTP header value
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"For example, the Apache 2.3 server by default limits the size of each field to 8190 bytes"
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https://en.wikipedia.org/wiki/List_of_HTTP_header_fields
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"""
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return strategies.text(
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alphabet=string.ascii_letters + string.digits + string.punctuation + " /t",
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min_size=1,
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average_size=40,
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max_size=8190,
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).filter(lambda s: len(s.encode("utf8")) < 8190)
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def headers():
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"""
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Strategy returning a list of tuples, containing HTTP header fields and their values.
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"[Apache 2.3] there can be at most 100 header fields in a single request."
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https://en.wikipedia.org/wiki/List_of_HTTP_header_fields
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"""
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return strategies.lists(
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strategies.tuples(header_name(), header_value()),
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min_size=0,
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average_size=10,
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max_size=100,
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)
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