From 892dd9da57c5cf005670743c8abfdfffc7027acc Mon Sep 17 00:00:00 2001
From: "P. Chen" <pengyu@libstarrify.so>
Date: Mon, 5 Oct 2020 21:00:58 +0100
Subject: [PATCH 1/7] Adding support for zstd in HttpCompressionMiddleware

---
 scrapy/downloadermiddlewares/httpcompression.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/scrapy/downloadermiddlewares/httpcompression.py b/scrapy/downloadermiddlewares/httpcompression.py
index 727c41466..b1abb8b5c 100644
--- a/scrapy/downloadermiddlewares/httpcompression.py
+++ b/scrapy/downloadermiddlewares/httpcompression.py
@@ -14,6 +14,12 @@ try:
 except ImportError:
     pass
 
+try:
+    import zstd
+    ACCEPTED_ENCODINGS.append(b'zstd')
+except ImportError:
+    pass
+
 
 class HttpCompressionMiddleware:
     """This middleware allows compressed (gzip, deflate) traffic to be
@@ -67,4 +73,6 @@ class HttpCompressionMiddleware:
                 body = zlib.decompress(body, -15)
         if encoding == b'br' and b'br' in ACCEPTED_ENCODINGS:
             body = brotli.decompress(body)
+        if encoding == b'zstd' and b'zstd' in ACCEPTED_ENCODINGS:
+            body = zstd.decompress(body)
         return body

From c6c3f2ce661ef9296302b9d489d5a2cb2e49f481 Mon Sep 17 00:00:00 2001
From: "P. Chen" <pengyu@libstarrify.so>
Date: Mon, 5 Oct 2020 21:10:40 +0100
Subject: [PATCH 2/7] Updating the doc entry for the HTTP compress downloader
 middleware on zstd

---
 docs/topics/downloader-middleware.rst | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/docs/topics/downloader-middleware.rst b/docs/topics/downloader-middleware.rst
index 06e614941..9645ed5fd 100644
--- a/docs/topics/downloader-middleware.rst
+++ b/docs/topics/downloader-middleware.rst
@@ -684,11 +684,14 @@ HttpCompressionMiddleware
    This middleware allows compressed (gzip, deflate) traffic to be
    sent/received from web sites.
 
-   This middleware also supports decoding `brotli-compressed`_ responses,
-   provided `brotlipy`_ is installed.
+   This middleware also supports decoding `brotli-compressed`_ as well as
+   `zstd-compressed`_ responses, provided that `brotlipy`_ or `zstd`_ is
+   installed, respectively.
 
 .. _brotli-compressed: https://www.ietf.org/rfc/rfc7932.txt
 .. _brotlipy: https://pypi.org/project/brotlipy/
+.. _zstd-compressed: https://www.ietf.org/rfc/rfc8478.txt
+.. _zstd: https://pypi.org/project/zstd/
 
 HttpCompressionMiddleware Settings
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From da3171d4f71d50a15b08b76b2b1e06bddfa56694 Mon Sep 17 00:00:00 2001
From: "P. Chen" <pengyu@libstarrify.so>
Date: Mon, 5 Oct 2020 23:18:58 +0100
Subject: [PATCH 3/7] Using the `zstandard` package than `zstd` for supporting
 frames both with and without the content size info

See also: https://github.com/sergey-dryabzhinsky/python-zstd/issues/53
---
 docs/topics/downloader-middleware.rst           | 4 ++--
 scrapy/downloadermiddlewares/httpcompression.py | 8 ++++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/docs/topics/downloader-middleware.rst b/docs/topics/downloader-middleware.rst
index 9645ed5fd..7c63a623d 100644
--- a/docs/topics/downloader-middleware.rst
+++ b/docs/topics/downloader-middleware.rst
@@ -685,13 +685,13 @@ HttpCompressionMiddleware
    sent/received from web sites.
 
    This middleware also supports decoding `brotli-compressed`_ as well as
-   `zstd-compressed`_ responses, provided that `brotlipy`_ or `zstd`_ is
+   `zstd-compressed`_ responses, provided that `brotlipy`_ or `zstandard`_ is
    installed, respectively.
 
 .. _brotli-compressed: https://www.ietf.org/rfc/rfc7932.txt
 .. _brotlipy: https://pypi.org/project/brotlipy/
 .. _zstd-compressed: https://www.ietf.org/rfc/rfc8478.txt
-.. _zstd: https://pypi.org/project/zstd/
+.. _zstandard: https://pypi.org/project/zstandard/
 
 HttpCompressionMiddleware Settings
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/scrapy/downloadermiddlewares/httpcompression.py b/scrapy/downloadermiddlewares/httpcompression.py
index b1abb8b5c..56421a6ba 100644
--- a/scrapy/downloadermiddlewares/httpcompression.py
+++ b/scrapy/downloadermiddlewares/httpcompression.py
@@ -1,4 +1,5 @@
 import zlib
+import io
 
 from scrapy.utils.gz import gunzip
 from scrapy.http import Response, TextResponse
@@ -15,7 +16,7 @@ except ImportError:
     pass
 
 try:
-    import zstd
+    import zstandard
     ACCEPTED_ENCODINGS.append(b'zstd')
 except ImportError:
     pass
@@ -74,5 +75,8 @@ class HttpCompressionMiddleware:
         if encoding == b'br' and b'br' in ACCEPTED_ENCODINGS:
             body = brotli.decompress(body)
         if encoding == b'zstd' and b'zstd' in ACCEPTED_ENCODINGS:
-            body = zstd.decompress(body)
+            # Using its streaming API since its simple API could handle only cases
+            # where there is content size data embedded in the frame
+            reader = zstandard.ZstdDecompressor().stream_reader(io.BytesIO(body))
+            body = reader.read()
         return body

From 50e1f35d1fcaeb2e0a0c4fb29894cb7c686a33cd Mon Sep 17 00:00:00 2001
From: "P. Chen" <pengyu@libstarrify.so>
Date: Mon, 5 Oct 2020 23:43:12 +0100
Subject: [PATCH 4/7] Adding test cases for the zstd content encoding

---
 tests/requirements-py3.txt                    |   3 +-
 .../html-zstd-static-content-size.bin         | Bin 0 -> 8066 bytes
 .../html-zstd-static-no-content-size.bin      | Bin 0 -> 8063 bytes
 .../html-zstd-streaming-no-content-size.bin   | Bin 0 -> 8047 bytes
 ...st_downloadermiddleware_httpcompression.py |  26 ++++++++++++++++++
 5 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 tests/sample_data/compressed/html-zstd-static-content-size.bin
 create mode 100644 tests/sample_data/compressed/html-zstd-static-no-content-size.bin
 create mode 100644 tests/sample_data/compressed/html-zstd-streaming-no-content-size.bin

diff --git a/tests/requirements-py3.txt b/tests/requirements-py3.txt
index 2247ed917..2eed2f5da 100644
--- a/tests/requirements-py3.txt
+++ b/tests/requirements-py3.txt
@@ -16,6 +16,7 @@ uvloop; platform_system != "Windows"
 
 # optional for shell wrapper tests
 bpython
-brotlipy
+brotlipy  # optional for HTTP compress downloader middleware tests
+zstandard  # optional for HTTP compress downloader middleware tests
 ipython
 pywin32; sys_platform == "win32"
diff --git a/tests/sample_data/compressed/html-zstd-static-content-size.bin b/tests/sample_data/compressed/html-zstd-static-content-size.bin
new file mode 100644
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diff --git a/tests/sample_data/compressed/html-zstd-static-no-content-size.bin b/tests/sample_data/compressed/html-zstd-static-no-content-size.bin
new file mode 100644
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diff --git a/tests/sample_data/compressed/html-zstd-streaming-no-content-size.bin b/tests/sample_data/compressed/html-zstd-streaming-no-content-size.bin
new file mode 100644
index 0000000000000000000000000000000000000000..97bdbcae01d8838c3ee046f227b91b99893daabe
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diff --git a/tests/test_downloadermiddleware_httpcompression.py b/tests/test_downloadermiddleware_httpcompression.py
index a806f55ce..63a69f7af 100644
--- a/tests/test_downloadermiddleware_httpcompression.py
+++ b/tests/test_downloadermiddleware_httpcompression.py
@@ -20,6 +20,12 @@ FORMAT = {
     'rawdeflate': ('html-rawdeflate.bin', 'deflate'),
     'zlibdeflate': ('html-zlibdeflate.bin', 'deflate'),
     'br': ('html-br.bin', 'br'),
+    # $ zstd raw.html --content-size -o html-zstd-static-content-size.bin
+    'zstd-static-content-size': ('html-zstd-static-content-size.bin', 'zstd'),
+    # $ zstd raw.html --no-content-size -o html-zstd-static-no-content-size.bin
+    'zstd-static-no-content-size': ('html-zstd-static-no-content-size.bin', 'zstd'),
+    # $ cat raw.html | zstd -o html-zstd-streaming-no-content-size.bin
+    'zstd-streaming-no-content-size': ('html-zstd-static-no-content-size.bin', 'zstd'),
 }
 
 
@@ -80,6 +86,26 @@ class HttpCompressionTest(TestCase):
         assert newresponse.body.startswith(b"<!DOCTYPE")
         assert 'Content-Encoding' not in newresponse.headers
 
+    def test_process_response_zstd(self):
+        try:
+            import zstandard  # noqa: F401
+        except ImportError:
+            raise SkipTest("no zstd support (zstandard)")
+        raw_content = None
+        for check_key in FORMAT:
+            if not check_key.startswith('zstd-'):
+                continue
+            response = self._getresponse(check_key)
+            request = response.request
+            self.assertEqual(response.headers['Content-Encoding'], b'zstd')
+            newresponse = self.mw.process_response(request, response, self.spider)
+            if raw_content is None:
+                raw_content = newresponse.body
+            assert raw_content == newresponse.body
+            assert newresponse is not response
+            assert newresponse.body.startswith(b"<!DOCTYPE")
+            assert 'Content-Encoding' not in newresponse.headers
+
     def test_process_response_rawdeflate(self):
         response = self._getresponse('rawdeflate')
         request = response.request

From 6032a9a31065a88886ef0f600c57ba63500b95ac Mon Sep 17 00:00:00 2001
From: "P. Chen" <pengyu@libstarrify.so>
Date: Mon, 5 Oct 2020 23:55:48 +0100
Subject: [PATCH 5/7] Minor adjustment to the test case in
 tests/test_downloadermiddleware_httpcompression.py

---
 tests/test_downloadermiddleware_httpcompression.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/test_downloadermiddleware_httpcompression.py b/tests/test_downloadermiddleware_httpcompression.py
index 63a69f7af..7e9f9cc5d 100644
--- a/tests/test_downloadermiddleware_httpcompression.py
+++ b/tests/test_downloadermiddleware_httpcompression.py
@@ -101,7 +101,8 @@ class HttpCompressionTest(TestCase):
             newresponse = self.mw.process_response(request, response, self.spider)
             if raw_content is None:
                 raw_content = newresponse.body
-            assert raw_content == newresponse.body
+            else:
+                assert raw_content == newresponse.body
             assert newresponse is not response
             assert newresponse.body.startswith(b"<!DOCTYPE")
             assert 'Content-Encoding' not in newresponse.headers

From 2e734e6b35f686f62dea11e9484c7646c7c49ca8 Mon Sep 17 00:00:00 2001
From: "P. Chen" <pengyu@libstarrify.so>
Date: Tue, 6 Oct 2020 19:51:05 +0100
Subject: [PATCH 6/7] Minor update on the import order in
 scrapy/downloadermiddlewares/httpcompression.py

---
 scrapy/downloadermiddlewares/httpcompression.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scrapy/downloadermiddlewares/httpcompression.py b/scrapy/downloadermiddlewares/httpcompression.py
index 56421a6ba..f504302e2 100644
--- a/scrapy/downloadermiddlewares/httpcompression.py
+++ b/scrapy/downloadermiddlewares/httpcompression.py
@@ -1,5 +1,5 @@
-import zlib
 import io
+import zlib
 
 from scrapy.utils.gz import gunzip
 from scrapy.http import Response, TextResponse

From 156bb0a1d413c7c6acafc30003ef98030a06e47f Mon Sep 17 00:00:00 2001
From: "P. Chen" <pengyu@libstarrify.so>
Date: Tue, 6 Oct 2020 19:53:40 +0100
Subject: [PATCH 7/7] Fixing the minor typo on test file path in
 tests/test_downloadermiddleware_httpcompression.py

---
 tests/test_downloadermiddleware_httpcompression.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/test_downloadermiddleware_httpcompression.py b/tests/test_downloadermiddleware_httpcompression.py
index 7e9f9cc5d..4c5bfc577 100644
--- a/tests/test_downloadermiddleware_httpcompression.py
+++ b/tests/test_downloadermiddleware_httpcompression.py
@@ -25,7 +25,7 @@ FORMAT = {
     # $ zstd raw.html --no-content-size -o html-zstd-static-no-content-size.bin
     'zstd-static-no-content-size': ('html-zstd-static-no-content-size.bin', 'zstd'),
     # $ cat raw.html | zstd -o html-zstd-streaming-no-content-size.bin
-    'zstd-streaming-no-content-size': ('html-zstd-static-no-content-size.bin', 'zstd'),
+    'zstd-streaming-no-content-size': ('html-zstd-streaming-no-content-size.bin', 'zstd'),
 }