chore(webrequest): test if endpoints are available at init

src/bibapi/webrequest.py

@@ -26,7 +26,9 @@ SIGNATURE = "RDS_SIGNATURE"
 EDITION = "RDS_EDITION"
 ISBN = "RDS_ISBN"
 AUTHOR = "RDS_PERSON"
-
+ALLOWED_IPS = [
+    "193.197.140.245",  # PHFR Internal
+]
 HEADERS = {
     "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 \
             (HTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36",
@@ -56,10 +58,11 @@ class WebRequest:
         self.data = None
         self.timeout = 5
         self.public_ip = None
+        self._can_run()
+        if self.public_ip not in ALLOWED_IPS:
+            raise PermissionError("IP not allowed to access the requested data.")
 
-        self.canrun()
-
-    def canrun(self) -> None:
+    def _can_run(self) -> None:
         """Check if requests can be made."""
         try:
             # check public IP to see if the requested data can be accessed