diff --git a/setup.py b/setup.py
index e0b4c90e2382..5d8486dc9a20 100644
--- a/setup.py
+++ b/setup.py
@@ -275,6 +275,7 @@ def build_extensions(self):
python_requires='>={}'.format('.'.join(str(n) for n in min_version)),
setup_requires=[
+ "certifi>=2020.06.20",
"numpy>=1.15",
],
install_requires=[
diff --git a/setupext.py b/setupext.py
index 1be0e744f7b5..a8a0ae7cdde7 100644
--- a/setupext.py
+++ b/setupext.py
@@ -42,6 +42,13 @@ def _get_hash(data):
return hasher.hexdigest()
+@functools.lru_cache()
+def _get_ssl_context():
+ import certifi
+ import ssl
+ return ssl.create_default_context(cafile=certifi.where())
+
+
def download_or_cache(url, sha):
"""
Get bytes from the given url or local cache.
@@ -73,7 +80,8 @@ def download_or_cache(url, sha):
# default User-Agent, but not (for example) wget; so I don't feel too
# bad passing in an empty User-Agent.
with urllib.request.urlopen(
- urllib.request.Request(url, headers={"User-Agent": ""})) as req:
+ urllib.request.Request(url, headers={"User-Agent": ""}),
+ context=_get_ssl_context()) as req:
data = req.read()
file_sha = _get_hash(data)
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