feat: add support for http_proxy

charmcraft.yaml

@@ -89,3 +89,15 @@ config:
     httpreq_username:
       type: string
       description: Basic authentication username
+    http_proxy:
+      description: URL of the HTTP proxy eg http://proxy.internal:6666, it will set the HTTP_PROXY var in the workload environment
+      type: string
+      default: ''
+    https_proxy:
+      description: URL of the HTTPS proxy eg http://proxy.internal:6666, it will set the HTTPS_PROXY var in the workload environment
+      type: string
+      default: ''
+    no_proxy:
+      description: Domains that need to be excluded from proxying no_proxy="test.com,test.co.uk", it is a comma separate list
+      type: string
+      default: ''

lib/charms/lego_base_k8s/v0/lego_client.py

@@ -95,7 +95,7 @@ def _plugin_config(self):
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 9
+LIBPATCH = 10
 
 
 logger = logging.getLogger(__name__)
@@ -224,7 +224,7 @@ def _push_csr_to_workload(self, csr: str) -> None:
     def _execute_lego_cmd(self) -> bool:
         """Execute lego command in workload container."""
         process = self._container.exec(
-            self._cmd, timeout=300, working_dir="/tmp", environment=self._plugin_config
+            self._cmd, timeout=300, working_dir="/tmp", environment=self._common_config | self._plugin_config
         )
         try:
             stdout, error = process.wait_output()
@@ -316,6 +316,27 @@ def _cmd(self) -> List[str]:
             "run",
         ]
 
+    @property
+    def _common_config(self) -> Dict[str, str]:
+        """Common configuration for the command
+
+        Used to set the environment context
+        
+        Returns:
+            dict[str, str]: common configuration.
+        """
+        common_config = {
+            "HTTPREQ_ENDPOINT": self._httpreq_endpoint,
+        }
+        if self._http_proxy:
+            common_config["HTTP_PROXY"] = self._http_proxy            
+        if self._https_proxy:
+            common_config["HTTPS_PROXY"] = self._https_proxy            
+        if self._no_proxy:
+            common_config["NO_PROXY"] = self._no_proxy
+
+        return common_config
+
     @property
     @abstractmethod
     def _plugin_config(self) -> Dict[str, str]:
@@ -358,3 +379,24 @@ def _server(self) -> Optional[str]:
         if not isinstance(server, str):
             return None
         return server
+
+    @property
+    def _http_proxy(self) -> Optional[str]:
+        http_proxy = self.model.config.get("http_proxy", None)
+        if not isinstance(http_proxy, str):
+            return None
+        return http_proxy
+
+    @property
+    def _https_proxy(self) -> Optional[str]:
+        https_proxy = self.model.config.get("https_proxy", None)
+        if not isinstance(https_proxy, str):
+            return None
+        return https_proxy
+
+    @property
+    def _no_proxy(self) -> Optional[str]:
+        no_proxy = self.model.config.get("no_proxy", None)
+        if not isinstance(no_proxy, str):
+            return None
+        return no_proxy