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# This file adapted from @Tomasino's example project
import os
import string
import random
from urllib.parse import parse_qs

allowedCerts={
        "<user>" : "<user's TLS_CLIENT_HASH>"
        }

def get_client_cert(cert_reqd = False, restricted_auth = False):
    TLS_CLIENT_HASH = os.getenv('TLS_CLIENT_HASH')
    if (TLS_CLIENT_HASH is None) and (cert_reqd):
        # Client hasn't provided client cert, so prompt for one
        show_header_cert_required()
    elif (restricted_auth == True and TLS_CLIENT_HASH not in allowedCerts.values()):
        # Reject login if we are restricting to allowed certificates
        show_wrong_cert()
    return TLS_CLIENT_HASH

def show_wrong_cert():
    print("61 Cert not authorized\r\n")

def get_query_string(unparsed = False):
    qStr = os.getenv('QUERY_STRING')
    if (qStr == None) or (unparsed) :
        return qStr

    return parse_qs(qStr)

def show_header_ok():
    print("20 text/gemini; charset=utf-8", end = "\r\n")

def temp_redirect(url):
    print(f"30 {url} ", end = "\r\n") 

def show_header_cert_required():
    print("60 text/gemini; charset=utf-8", end = "\r\n")
    quit()

def show_query_string_required(msg):
    print("10 " + msg, end = "\r\n")
    quit()

def get_path_info():
    return os.getenv("PATH_INFO")

def read_file(fullPath):
    #TODO: error handling for file path
    contents = ""
    with open(fullPath) as f:
        contents = f.read()
    return contents

def id_generator(size=12, chars=string.ascii_uppercase + string.digits):
    return ''.join(random.choice(chars) for _ in range(size))