Fix SSL errors

[longmathemagician]

Fixes #8 & #40 by passing Mozilla's root certs to urllib. As far as I can tell this is the idiomatic solution for recent Python versions. Requires the installation of python-certifi (pip install certifi), which should probably be included in the fix for #36.

[jmmelko]

This fix is becoming urgent as we have permanent SSL certification errors with our newest python installations (3.12).
However the provided fix triggers a timeout error:

Une exception s'est produite : URLError <urlopen error [WinError 10060] Une tentative de connexion a échoué car le parti
connecté n’a pas répondu convenablement au-delà d’une certaine durée ou une connexion établie a échoué car l’hôte de
connexion n’a pas répondu> TimeoutError: [WinError 10060] Une tentative de connexion a échoué car le parti connecté n’a pas
répondu convenablement au-delà d’une certaine durée ou une connexion établie a échoué car l’hôte de connexion n’a pas
répondu During handling of the above exception, another exception occurred:


urllib.error.URLError: <urlopen error [WinError 10060] Une tentative de connexion a échoué car le parti connecté n’a pas
répondu convenablement au-delà d’une certaine durée ou une connexion établie a échoué car l’hôte de connexion n’a pas
répondu>

[jmmelko]

Hi,

your solution will conflict with the proxy. I suggest the following:

def requestOpener(url):
    
    context = ssl.create_default_context(cafile=certifi.where()) # Uses a SSL certificate, mandatory since Python 3.9.x
    handler = urllib2.HTTPSHandler(context=context)
    # Proxy handling # https://stackoverflow.com/questions/1450132/proxy-with-urllib2
    if VARIABLES['PROXY']:
        print('Using proxy '+str(VARIABLES['PROXY']))
        proxy = urllib2.ProxyHandler(VARIABLES['PROXY'])
    else:
        proxy = urllib2.ProxyHandler({})
    
    opener = urllib2.build_opener(proxy, handler)
    urllib2.install_opener(opener)     
    
    return urllib2.urlopen(url)  

Feel free to improve this, pull a new request, and force the developer to at last update his code

[rde-girl]

I am getting the same error and have not been able to resolve even by connecting through a hotspot. @jmmelko thank you for providing a solution. I am just curious with where it should be implemented? It looks close to the structure in the function queryHITRAN. Thank you for your help, The solution from @longmathemagician did not solve my particular issue unfortunately.

URLError: <urlopen error [WinError 10060] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

Cell In[20], line 1
[sim_1f_up,sim_2f_up,sim_4f_up,sim_2f_1f_up,sim_4f_2f_up,T_arr,PH2O_arr,delta_nuC_arr] = wms.generate_lookup(T_range,PH2O_range,delta_nuC_range,L,nu0,i0_up,i2_up,bl_coef[4],bl_coef[8],phi_range)

File ~\OneDrive\Documents\hapi\WMS_functions.py:999 in generate_lookup
hpi.fetch('temp1',1,1,border_wing[0],border_wing[1],ParameterGroups=['160-char'])

File ~\OneDrive\Documents\hapi\hapi.py:4900 in fetch
---

File ~\OneDrive\Documents\hapi\hapi.py:2875 in queryHITRAN
raise Exception('Failed to retrieve data for given parameters.')

Exception: Cannot connect to http://hitran.org. Try again or edit GLOBAL_HOST variable.