Revize cfda1725

Re #8573 - Implemented get_public_key_of_a_certificate method in CertController and added /api/certificates/<id>/public_key endpoint

src/controllers/certificates_controller.py

@@ -30 +30 @@
 
 E_NO_ISSUER_FOUND = {"success": False, "data": "No certificate authority with such unique ID exists."}
 E_NO_CERTIFICATES_FOUND = {"success": False, "data": "No such certificate found."}
+E_NO_CERT_PRIVATE_KEY_FOUND = {"success": False,
+                               "data": "Internal server error (certificate's private key cannot be found)."}
 E_NOT_JSON_FORMAT = {"success": False, "data": "The request must be JSON-formatted."}
 E_CORRUPTED_DATABASE = {"success": False, "data": "Internal server error (corrupted database)."}
 E_GENERAL_ERROR = {"success": False, "data": "Internal server error (unknown origin)."}
@@ -38 +40 @@
 
 C_CREATED_SUCCESSFULLY = 201
 C_BAD_REQUEST = 400
-C_NO_DATA = 205                                                         # TODO related to 204 issue
+C_NOT_FOUND = 404
+C_NO_DATA = 205  # TODO related to 204 issue
 C_INTERNAL_SERVER_ERROR = 500
 C_SUCCESS = 200
 
@@ -341 +344 @@
             USAGE: {CertController.INVERSE_KEY_MAP[k]: v for k, v in c.usages.items()},
             CA: c_issuer.certificate_id
         }
+
+    def get_public_key_of_a_certificate(self, id):
+        """
+        Get a private key used to sign a certificate in PEM format specified by certificate's ID
+
+        :param id: ID of a certificate whose public key is to be queried
+        :type id: dict | bytes
+
+        :rtype: PemResponse
+        """
+
+        # try to parse the supplied ID
+        try:
+            v = int(id)
+        except ValueError:
+            return E_WRONG_PARAMETERS, C_BAD_REQUEST
+
+        # find a certificate with using the given ID
+        cert = self.certificate_service.get_certificate(v)
+
+        if cert is None:
+            return E_NO_CERTIFICATES_FOUND, C_NOT_FOUND
+        else:
+            # certificate exists, fetch it's private key
+            private_key = self.key_service.get_key(cert.private_key_id)
+            if cert is None:
+                return E_NO_CERT_PRIVATE_KEY_FOUND, C_INTERNAL_SERVER_ERROR
+            else:
+                # TODO public key can be extracted from a certificate
+                # private key fetched, extract a public key from it
+                public_key = self.key_service.get_public_key(private_key)
+                return {"success": True, "data": public_key}, C_SUCCESS