feat: add support for custom authorization header names

Signed-off-by: Kosea Kalema <koseakalema2@gmail.com>

Author: Ndugu2

kubernetes/client/configuration.py

@@ -161,15 +161,29 @@ def __init__(self, host="http://localhost",
         self.proxy = None
         """Proxy URL
         """
-        self.no_proxy = None
-# Load proxy from environment variables (if set)
+        self.authorization_header = "Authorization"
+        """Custom authorization header name (default: "Authorization")"""
+        self.no_proxy = []
+        # Load proxy from environment variables (if set)
         if os.getenv("HTTPS_PROXY"): self.proxy = os.getenv("HTTPS_PROXY")
         if os.getenv("https_proxy"): self.proxy = os.getenv("https_proxy")
         if os.getenv("HTTP_PROXY"): self.proxy = os.getenv("HTTP_PROXY")
         if os.getenv("http_proxy"): self.proxy = os.getenv("http_proxy")
-        # Load no_proxy from environment variables (if set)
-        if os.getenv("NO_PROXY"): self.no_proxy = os.getenv("NO_PROXY")
-        if os.getenv("no_proxy"): self.no_proxy = os.getenv("no_proxy")
+        # Load and parse no_proxy from environment variables
+        # Check for uppercase NO_PROXY first (should take precedence)
+        no_proxy_env = None
+        # Check if NO_PROXY exists in environment (even if empty)
+        if "NO_PROXY" in os.environ:
+            no_proxy_env = os.getenv("NO_PROXY")
+        elif "no_proxy" in os.environ:
+            no_proxy_env = os.getenv("no_proxy")
+            
+        if no_proxy_env is not None and no_proxy_env != "":
+            self.no_proxy = [
+                domain.strip()
+                for domain in no_proxy_env.split(",")
+                if domain.strip()
+            ]
         """bypass proxy for host in the no_proxy list.
         """
         self.proxy_headers = None
@@ -345,12 +359,22 @@ def auth_settings(self):
         :return: The Auth Settings information dict.
         """
         auth = {}
-        if 'authorization' in self.api_key:
+        # Check for the configured authorization header name in api_key (case-insensitive)
+        header_name_lower = self.authorization_header.lower()
+        
+        # Find the actual key in api_key that matches case-insensitively
+        actual_key = None
+        for key in self.api_key:
+            if key.lower() == header_name_lower:
+                actual_key = key
+                break
+        
+        if actual_key is not None:
             auth['BearerToken'] = {
                 'type': 'api_key',
                 'in': 'header',
-                'key': 'authorization',
-                'value': self.get_api_key_with_prefix('authorization')
+                'key': self.authorization_header,  # Use the configured case
+                'value': self.get_api_key_with_prefix(actual_key)  # Use the actual key from api_key
             }
         return auth
 
@@ -411,4 +435,4 @@ def get_host_from_settings(self, index, variables=None):
 
             url = url.replace("{" + variable_name + "}", used_value)
 
-        return url
+        return url