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import pytest
from scrapy.robotstxt import (
ProtegoRobotParser,
PythonRobotParser,
RerpRobotParser,
decode_robotstxt,
)
def rerp_available():
# check if robotexclusionrulesparser is installed
try:
from robotexclusionrulesparser import ( # noqa: PLC0415
RobotExclusionRulesParser, # noqa: F401
)
except ImportError:
return False
return True
class BaseRobotParserTest:
def _setUp(self, parser_cls):
self.parser_cls = parser_cls
def test_allowed(self):
robotstxt_robotstxt_body = (
b"User-agent: * \nDisallow: /disallowed \nAllow: /allowed \nCrawl-delay: 10"
)
rp = self.parser_cls.from_crawler(
crawler=None, robotstxt_body=robotstxt_robotstxt_body
)
assert rp.allowed("https://www.site.local/allowed", "*")
assert not rp.allowed("https://www.site.local/disallowed", "*")
def test_allowed_wildcards(self):
robotstxt_robotstxt_body = b"""User-agent: first
Disallow: /disallowed/*/end$
User-agent: second
Allow: /*allowed
Disallow: /
"""
rp = self.parser_cls.from_crawler(
crawler=None, robotstxt_body=robotstxt_robotstxt_body
)
assert rp.allowed("https://www.site.local/disallowed", "first")
assert not rp.allowed("https://www.site.local/disallowed/xyz/end", "first")
assert not rp.allowed("https://www.site.local/disallowed/abc/end", "first")
assert rp.allowed("https://www.site.local/disallowed/xyz/endinglater", "first")
assert rp.allowed("https://www.site.local/allowed", "second")
assert rp.allowed("https://www.site.local/is_still_allowed", "second")
assert rp.allowed("https://www.site.local/is_allowed_too", "second")
def test_length_based_precedence(self):
robotstxt_robotstxt_body = b"User-agent: * \nDisallow: / \nAllow: /page"
rp = self.parser_cls.from_crawler(
crawler=None, robotstxt_body=robotstxt_robotstxt_body
)
assert rp.allowed("https://www.site.local/page", "*")
def test_order_based_precedence(self):
robotstxt_robotstxt_body = b"User-agent: * \nDisallow: / \nAllow: /page"
rp = self.parser_cls.from_crawler(
crawler=None, robotstxt_body=robotstxt_robotstxt_body
)
assert not rp.allowed("https://www.site.local/page", "*")
def test_empty_response(self):
"""empty response should equal 'allow all'"""
rp = self.parser_cls.from_crawler(crawler=None, robotstxt_body=b"")
assert rp.allowed("https://site.local/", "*")
assert rp.allowed("https://site.local/", "chrome")
assert rp.allowed("https://site.local/index.html", "*")
assert rp.allowed("https://site.local/disallowed", "*")
def test_garbage_response(self):
"""garbage response should be discarded, equal 'allow all'"""
robotstxt_robotstxt_body = b"GIF89a\xd3\x00\xfe\x00\xa2"
rp = self.parser_cls.from_crawler(
crawler=None, robotstxt_body=robotstxt_robotstxt_body
)
assert rp.allowed("https://site.local/", "*")
assert rp.allowed("https://site.local/", "chrome")
assert rp.allowed("https://site.local/index.html", "*")
assert rp.allowed("https://site.local/disallowed", "*")
def test_unicode_url_and_useragent(self):
robotstxt_robotstxt_body = """
User-Agent: *
Disallow: /admin/
Disallow: /static/
# taken from https://en.wikipedia.org/robots.txt
Disallow: /wiki/K%C3%A4ytt%C3%A4j%C3%A4:
Disallow: /wiki/Käyttäjä:
User-Agent: UnicödeBöt
Disallow: /some/randome/page.html""".encode()
rp = self.parser_cls.from_crawler(
crawler=None, robotstxt_body=robotstxt_robotstxt_body
)
assert rp.allowed("https://site.local/", "*")
assert not rp.allowed("https://site.local/admin/", "*")
assert not rp.allowed("https://site.local/static/", "*")
assert rp.allowed("https://site.local/admin/", "UnicödeBöt")
assert not rp.allowed("https://site.local/wiki/K%C3%A4ytt%C3%A4j%C3%A4:", "*")
assert not rp.allowed("https://site.local/wiki/Käyttäjä:", "*")
assert rp.allowed("https://site.local/some/randome/page.html", "*")
assert not rp.allowed("https://site.local/some/randome/page.html", "UnicödeBöt")
class TestDecodeRobotsTxt:
def test_native_string_conversion(self):
robotstxt_body = b"User-agent: *\nDisallow: /\n"
decoded_content = decode_robotstxt(
robotstxt_body, spider=None, to_native_str_type=True
)
assert decoded_content == "User-agent: *\nDisallow: /\n"
def test_decode_utf8(self):
robotstxt_body = b"User-agent: *\nDisallow: /\n"
decoded_content = decode_robotstxt(robotstxt_body, spider=None)
assert decoded_content == "User-agent: *\nDisallow: /\n"
def test_decode_non_utf8(self):
robotstxt_body = b"User-agent: *\n\xffDisallow: /\n"
decoded_content = decode_robotstxt(robotstxt_body, spider=None)
assert decoded_content == "User-agent: *\nDisallow: /\n"
# UTF-8 BOM at the beginning of the file ignored
def test_decode_utf8_bom(self):
robotstxt_body = b"\xef\xbb\xbfUser-agent: *\nDisallow: /\n"
decoded_content = decode_robotstxt(robotstxt_body, spider=None)
assert decoded_content == "User-agent: *\nDisallow: /\n"
class TestPythonRobotParser(BaseRobotParserTest):
def setup_method(self):
super()._setUp(PythonRobotParser)
def test_length_based_precedence(self):
pytest.skip(
"RobotFileParser does not support length based directives precedence."
)
def test_allowed_wildcards(self):
pytest.skip("RobotFileParser does not support wildcards.")
@pytest.mark.skipif(not rerp_available(), reason="Rerp parser is not installed")
class TestRerpRobotParser(BaseRobotParserTest):
def setup_method(self):
super()._setUp(RerpRobotParser)
def test_length_based_precedence(self):
pytest.skip("Rerp does not support length based directives precedence.")
class TestProtegoRobotParser(BaseRobotParserTest):
def setup_method(self):
super()._setUp(ProtegoRobotParser)
def test_order_based_precedence(self):
pytest.skip("Protego does not support order based directives precedence.")
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