mirror of https://github.com/scrapy/scrapy.git
401 lines
16 KiB
Python
401 lines
16 KiB
Python
from gzip import GzipFile
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from io import BytesIO
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from pathlib import Path
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from unittest import SkipTest, TestCase
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from warnings import catch_warnings
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from w3lib.encoding import resolve_encoding
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from scrapy.downloadermiddlewares.httpcompression import (
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ACCEPTED_ENCODINGS,
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HttpCompressionMiddleware,
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)
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from scrapy.exceptions import NotConfigured, ScrapyDeprecationWarning
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from scrapy.http import HtmlResponse, Request, Response
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from scrapy.responsetypes import responsetypes
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from scrapy.spiders import Spider
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from scrapy.utils.gz import gunzip
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from scrapy.utils.test import get_crawler
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from tests import tests_datadir
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SAMPLEDIR = Path(tests_datadir, "compressed")
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FORMAT = {
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"gzip": ("html-gzip.bin", "gzip"),
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"x-gzip": ("html-gzip.bin", "gzip"),
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"rawdeflate": ("html-rawdeflate.bin", "deflate"),
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"zlibdeflate": ("html-zlibdeflate.bin", "deflate"),
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"br": ("html-br.bin", "br"),
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# $ zstd raw.html --content-size -o html-zstd-static-content-size.bin
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"zstd-static-content-size": ("html-zstd-static-content-size.bin", "zstd"),
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# $ zstd raw.html --no-content-size -o html-zstd-static-no-content-size.bin
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"zstd-static-no-content-size": ("html-zstd-static-no-content-size.bin", "zstd"),
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# $ cat raw.html | zstd -o html-zstd-streaming-no-content-size.bin
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"zstd-streaming-no-content-size": (
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"html-zstd-streaming-no-content-size.bin",
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"zstd",
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),
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}
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class HttpCompressionTest(TestCase):
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def setUp(self):
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self.crawler = get_crawler(Spider)
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self.spider = self.crawler._create_spider("scrapytest.org")
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self.mw = HttpCompressionMiddleware.from_crawler(self.crawler)
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self.crawler.stats.open_spider(self.spider)
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def _getresponse(self, coding):
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if coding not in FORMAT:
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raise ValueError()
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samplefile, contentencoding = FORMAT[coding]
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body = (SAMPLEDIR / samplefile).read_bytes()
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headers = {
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"Server": "Yaws/1.49 Yet Another Web Server",
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"Date": "Sun, 08 Mar 2009 00:41:03 GMT",
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"Content-Length": len(body),
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"Content-Type": "text/html",
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"Content-Encoding": contentencoding,
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}
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response = Response("http://scrapytest.org/", body=body, headers=headers)
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response.request = Request(
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"http://scrapytest.org", headers={"Accept-Encoding": "gzip, deflate"}
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)
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return response
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def assertStatsEqual(self, key, value):
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self.assertEqual(
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self.crawler.stats.get_value(key, spider=self.spider),
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value,
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str(self.crawler.stats.get_stats(self.spider)),
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)
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def test_setting_false_compression_enabled(self):
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self.assertRaises(
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NotConfigured,
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HttpCompressionMiddleware.from_crawler,
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get_crawler(settings_dict={"COMPRESSION_ENABLED": False}),
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)
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def test_setting_default_compression_enabled(self):
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self.assertIsInstance(
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HttpCompressionMiddleware.from_crawler(get_crawler()),
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HttpCompressionMiddleware,
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)
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def test_setting_true_compression_enabled(self):
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self.assertIsInstance(
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HttpCompressionMiddleware.from_crawler(
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get_crawler(settings_dict={"COMPRESSION_ENABLED": True})
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),
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HttpCompressionMiddleware,
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)
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def test_process_request(self):
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request = Request("http://scrapytest.org")
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assert "Accept-Encoding" not in request.headers
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self.mw.process_request(request, self.spider)
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self.assertEqual(
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request.headers.get("Accept-Encoding"), b", ".join(ACCEPTED_ENCODINGS)
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)
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def test_process_response_gzip(self):
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response = self._getresponse("gzip")
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request = response.request
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self.assertEqual(response.headers["Content-Encoding"], b"gzip")
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newresponse = self.mw.process_response(request, response, self.spider)
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assert newresponse is not response
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assert newresponse.body.startswith(b"<!DOCTYPE")
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assert "Content-Encoding" not in newresponse.headers
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", 74837)
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def test_process_response_gzip_no_stats(self):
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mw = HttpCompressionMiddleware()
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response = self._getresponse("gzip")
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request = response.request
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self.assertEqual(response.headers["Content-Encoding"], b"gzip")
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newresponse = mw.process_response(request, response, self.spider)
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self.assertEqual(mw.stats, None)
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assert newresponse is not response
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assert newresponse.body.startswith(b"<!DOCTYPE")
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assert "Content-Encoding" not in newresponse.headers
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def test_process_response_br(self):
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try:
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import brotli # noqa: F401
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except ImportError:
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raise SkipTest("no brotli")
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response = self._getresponse("br")
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request = response.request
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self.assertEqual(response.headers["Content-Encoding"], b"br")
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newresponse = self.mw.process_response(request, response, self.spider)
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assert newresponse is not response
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assert newresponse.body.startswith(b"<!DOCTYPE")
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assert "Content-Encoding" not in newresponse.headers
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", 74837)
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def test_process_response_zstd(self):
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try:
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import zstandard # noqa: F401
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except ImportError:
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raise SkipTest("no zstd support (zstandard)")
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raw_content = None
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for check_key in FORMAT:
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if not check_key.startswith("zstd-"):
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continue
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response = self._getresponse(check_key)
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request = response.request
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self.assertEqual(response.headers["Content-Encoding"], b"zstd")
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newresponse = self.mw.process_response(request, response, self.spider)
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if raw_content is None:
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raw_content = newresponse.body
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else:
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assert raw_content == newresponse.body
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assert newresponse is not response
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assert newresponse.body.startswith(b"<!DOCTYPE")
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assert "Content-Encoding" not in newresponse.headers
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def test_process_response_rawdeflate(self):
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response = self._getresponse("rawdeflate")
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request = response.request
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self.assertEqual(response.headers["Content-Encoding"], b"deflate")
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newresponse = self.mw.process_response(request, response, self.spider)
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assert newresponse is not response
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assert newresponse.body.startswith(b"<!DOCTYPE")
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assert "Content-Encoding" not in newresponse.headers
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", 74840)
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def test_process_response_zlibdelate(self):
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response = self._getresponse("zlibdeflate")
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request = response.request
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self.assertEqual(response.headers["Content-Encoding"], b"deflate")
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newresponse = self.mw.process_response(request, response, self.spider)
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assert newresponse is not response
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assert newresponse.body.startswith(b"<!DOCTYPE")
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assert "Content-Encoding" not in newresponse.headers
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", 74840)
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def test_process_response_plain(self):
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response = Response("http://scrapytest.org", body=b"<!DOCTYPE...")
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request = Request("http://scrapytest.org")
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assert not response.headers.get("Content-Encoding")
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newresponse = self.mw.process_response(request, response, self.spider)
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assert newresponse is response
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assert newresponse.body.startswith(b"<!DOCTYPE")
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self.assertStatsEqual("httpcompression/response_count", None)
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self.assertStatsEqual("httpcompression/response_bytes", None)
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def test_multipleencodings(self):
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response = self._getresponse("gzip")
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response.headers["Content-Encoding"] = ["uuencode", "gzip"]
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request = response.request
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newresponse = self.mw.process_response(request, response, self.spider)
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assert newresponse is not response
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self.assertEqual(newresponse.headers.getlist("Content-Encoding"), [b"uuencode"])
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def test_process_response_encoding_inside_body(self):
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headers = {
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"Content-Type": "text/html",
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"Content-Encoding": "gzip",
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}
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f = BytesIO()
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plainbody = (
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b"<html><head><title>Some page</title>"
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b'<meta http-equiv="Content-Type" content="text/html; charset=gb2312">'
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)
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zf = GzipFile(fileobj=f, mode="wb")
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zf.write(plainbody)
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zf.close()
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response = Response(
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"http;//www.example.com/", headers=headers, body=f.getvalue()
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)
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request = Request("http://www.example.com/")
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newresponse = self.mw.process_response(request, response, self.spider)
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assert isinstance(newresponse, HtmlResponse)
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self.assertEqual(newresponse.body, plainbody)
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self.assertEqual(newresponse.encoding, resolve_encoding("gb2312"))
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", len(plainbody))
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def test_process_response_force_recalculate_encoding(self):
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headers = {
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"Content-Type": "text/html",
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"Content-Encoding": "gzip",
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}
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f = BytesIO()
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plainbody = (
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b"<html><head><title>Some page</title>"
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b'<meta http-equiv="Content-Type" content="text/html; charset=gb2312">'
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)
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zf = GzipFile(fileobj=f, mode="wb")
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zf.write(plainbody)
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zf.close()
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response = HtmlResponse(
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"http;//www.example.com/page.html", headers=headers, body=f.getvalue()
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)
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request = Request("http://www.example.com/")
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newresponse = self.mw.process_response(request, response, self.spider)
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assert isinstance(newresponse, HtmlResponse)
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self.assertEqual(newresponse.body, plainbody)
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self.assertEqual(newresponse.encoding, resolve_encoding("gb2312"))
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", len(plainbody))
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def test_process_response_no_content_type_header(self):
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headers = {
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"Content-Encoding": "identity",
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}
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plainbody = (
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b"<html><head><title>Some page</title>"
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b'<meta http-equiv="Content-Type" content="text/html; charset=gb2312">'
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)
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respcls = responsetypes.from_args(
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url="http://www.example.com/index", headers=headers, body=plainbody
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)
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response = respcls(
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"http://www.example.com/index", headers=headers, body=plainbody
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)
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request = Request("http://www.example.com/index")
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newresponse = self.mw.process_response(request, response, self.spider)
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assert isinstance(newresponse, respcls)
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self.assertEqual(newresponse.body, plainbody)
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self.assertEqual(newresponse.encoding, resolve_encoding("gb2312"))
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", len(plainbody))
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def test_process_response_gzipped_contenttype(self):
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response = self._getresponse("gzip")
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response.headers["Content-Type"] = "application/gzip"
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request = response.request
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newresponse = self.mw.process_response(request, response, self.spider)
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self.assertIsNot(newresponse, response)
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self.assertTrue(newresponse.body.startswith(b"<!DOCTYPE"))
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self.assertNotIn("Content-Encoding", newresponse.headers)
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", 74837)
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def test_process_response_gzip_app_octetstream_contenttype(self):
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response = self._getresponse("gzip")
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response.headers["Content-Type"] = "application/octet-stream"
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request = response.request
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newresponse = self.mw.process_response(request, response, self.spider)
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self.assertIsNot(newresponse, response)
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self.assertTrue(newresponse.body.startswith(b"<!DOCTYPE"))
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self.assertNotIn("Content-Encoding", newresponse.headers)
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", 74837)
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def test_process_response_gzip_binary_octetstream_contenttype(self):
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response = self._getresponse("x-gzip")
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response.headers["Content-Type"] = "binary/octet-stream"
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request = response.request
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newresponse = self.mw.process_response(request, response, self.spider)
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self.assertIsNot(newresponse, response)
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self.assertTrue(newresponse.body.startswith(b"<!DOCTYPE"))
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self.assertNotIn("Content-Encoding", newresponse.headers)
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", 74837)
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def test_process_response_gzipped_gzip_file(self):
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"""Test that a gzip Content-Encoded .gz file is gunzipped
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only once by the middleware, leaving gunzipping of the file
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to upper layers.
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"""
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headers = {
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"Content-Type": "application/gzip",
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"Content-Encoding": "gzip",
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}
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# build a gzipped file (here, a sitemap)
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f = BytesIO()
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plainbody = b"""<?xml version="1.0" encoding="UTF-8"?>
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<urlset xmlns="http://www.google.com/schemas/sitemap/0.84">
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<url>
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<loc>http://www.example.com/</loc>
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<lastmod>2009-08-16</lastmod>
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<changefreq>daily</changefreq>
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<priority>1</priority>
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</url>
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<url>
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<loc>http://www.example.com/Special-Offers.html</loc>
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<lastmod>2009-08-16</lastmod>
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<changefreq>weekly</changefreq>
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<priority>0.8</priority>
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</url>
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</urlset>"""
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gz_file = GzipFile(fileobj=f, mode="wb")
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gz_file.write(plainbody)
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gz_file.close()
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# build a gzipped response body containing this gzipped file
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r = BytesIO()
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gz_resp = GzipFile(fileobj=r, mode="wb")
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gz_resp.write(f.getvalue())
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gz_resp.close()
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response = Response(
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"http;//www.example.com/", headers=headers, body=r.getvalue()
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)
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request = Request("http://www.example.com/")
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newresponse = self.mw.process_response(request, response, self.spider)
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self.assertEqual(gunzip(newresponse.body), plainbody)
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self.assertStatsEqual("httpcompression/response_count", 1)
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self.assertStatsEqual("httpcompression/response_bytes", 230)
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def test_process_response_head_request_no_decode_required(self):
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response = self._getresponse("gzip")
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response.headers["Content-Type"] = "application/gzip"
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request = response.request
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request.method = "HEAD"
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response = response.replace(body=None)
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newresponse = self.mw.process_response(request, response, self.spider)
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self.assertIs(newresponse, response)
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self.assertEqual(response.body, b"")
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self.assertStatsEqual("httpcompression/response_count", None)
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self.assertStatsEqual("httpcompression/response_bytes", None)
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class HttpCompressionSubclassTest(TestCase):
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def test_init_missing_stats(self):
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class HttpCompressionMiddlewareSubclass(HttpCompressionMiddleware):
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def __init__(self):
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super().__init__()
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crawler = get_crawler(Spider)
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with catch_warnings(record=True) as caught_warnings:
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HttpCompressionMiddlewareSubclass.from_crawler(crawler)
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messages = tuple(
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str(warning.message)
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for warning in caught_warnings
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if warning.category is ScrapyDeprecationWarning
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)
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self.assertEqual(
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messages,
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(
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(
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"HttpCompressionMiddleware subclasses must either modify "
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"their '__init__' method to support a 'stats' parameter "
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"or reimplement the 'from_crawler' method."
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),
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),
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)
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