SYSTEM_CA_CERTS is wrong Debian based OS

[Nicolas Bessi - Camptocamp]

Hello,

SYSTEM_CA_CERTS constant define in _browser.py is hardcoded and won't work with many OS.
It will raise following exception at SSL level.

  File "/opt/python_env/2.7/lib/python2.7/site-packages/lazr/restfulclient/_browser.py", line 423, in get_wadl_application
    response, content = self._request(url, media_type=wadl_type)
  File "/opt/python_env/2.7/lib/python2.7/site-packages/lazr/restfulclient/_browser.py", line 358, in _request
    str(url), method=method, body=data, headers=headers)
  File "/opt/python_env/2.7/lib/python2.7/site-packages/lazr/restfulclient/_browser.py", line 326, in _request_and_retry
    url, method=method, body=body, headers=headers)
  File "/opt/python_env/2.7/lib/python2.7/site-packages/httplib2/__init__.py", line 1598, in request
    (response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
  File "/opt/python_env/2.7/lib/python2.7/site-packages/lazr/restfulclient/_browser.py", line 153, in _request
    redirections, cachekey)
  File "/opt/python_env/2.7/lib/python2.7/site-packages/httplib2/__init__.py", line 1346, in _request
    (response, content) = self._conn_request(conn, request_uri, method, body, headers)
  File "/opt/python_env/2.7/lib/python2.7/site-packages/httplib2/__init__.py", line 1282, in _conn_request
    conn.connect()
  File "/opt/python_env/2.7/lib/python2.7/site-packages/httplib2/__init__.py", line 1013, in connect
    self.disable_ssl_certificate_validation, self.ca_certs)
  File "/opt/python_env/2.7/lib/python2.7/site-packages/httplib2/__init__.py", line 80, in _ssl_wrap_socket
    cert_reqs=cert_reqs, ca_certs=ca_certs)
  File "/opt/homebrew/Cellar/python/2.7.1/lib/python2.7/ssl.py", line 346, in wrap_socket
    ciphers=ciphers)
  File "/opt/homebrew/Cellar/python/2.7.1/lib/python2.7/ssl.py", line 118, in __init__
    self._sslobj = _ssl.sslwrap(self._sock, server_side,
ssl.SSLError: [Errno 185090050] _ssl.c:336: error:0B084002:x509 certificate routines:X509_load_cert_crl_file:system lib

I do not know how to do get vert file in a cross platform way. My temporary fix is the following:

if os.path.exists('/etc/ssl/certs/ca-certificates.crt'):
    SYSTEM_CA_CERTS = '/etc/ssl/certs/ca-certificates.crt'
else:
    from httplib2 import CA_CERTS as default_certs
    SYSTEM_CA_CERTS = default_certs

Regards

Nicolas