TUN-7360: Add Get Host Details handler in management service

With the management tunnels work, we allow calls to our edge service
   using an access JWT provided by Tunnelstore. Given a connector ID,
   this request is then proxied to the appropriate Cloudflare Tunnel.

   This PR takes advantage of this flow and adds a new host_details
   endpoint. Calls to this endpoint will result in cloudflared gathering
   some details about the host: hostname (os.hostname()) and ip address
   (localAddr in a dial).

   Note that the mini spec lists 4 alternatives and this picks alternative
   3 because:

   1. Ease of implementation: This is quick and non-intrusive to any of our
      code path. We expect to change how connection tracking works and
      regardless of the direction we take, it may be easy to keep, morph
      or throw this away.

   2. The cloudflared part of this round trip takes some time with a
      hostname call and a dial. But note that this is off the critical path
      and not an API that will be exercised often.

component-tests/test_tunnel.py

@@ -1,9 +1,11 @@
 #!/usr/bin/env python
 import requests
 from conftest import CfdModes
-from constants import METRICS_PORT, MAX_RETRIES, BACKOFF_SECS
+from constants import METRICS_PORT, MAX_RETRIES, BACKOFF_SECS, MANAGEMENT_HOST_NAME 
 from retrying import retry
-from util import LOGGER, start_cloudflared, wait_tunnel_ready, send_requests
+from cli import CloudflaredCli
+from util import LOGGER, write_config, start_cloudflared, wait_tunnel_ready, send_requests
+import platform
 
 class TestTunnel:
     '''Test tunnels with no ingress rules from config.yaml but ingress rules from CLI only'''
@@ -14,6 +16,39 @@ class TestTunnel:
         with start_cloudflared(tmp_path, config, cfd_args=["run", "--hello-world"], new_process=True):
             wait_tunnel_ready(tunnel_url=config.get_url(),
                               require_min_connections=4)
+
+    """
+        test_get_host_details does the following:
+        1. It gets a management token from Tunnelstore using cloudflared tail token <tunnel_id>
+        2. It gets the connector_id after starting a cloudflare tunnel
+        3. It sends a request to the management host with the connector_id and management token
+        4. Asserts that the response has a hostname and ip.
+    """
+    def test_get_host_details(self, tmp_path, component_tests_config):
+        # TUN-7377 : wait_tunnel_ready does not work properly in windows.
+        # Skipping this test for windows for now and will address it as part of tun-7377
+        if platform.system() == "Windows":
+            return
+        config = component_tests_config(cfd_mode=CfdModes.NAMED, run_proxy_dns=False, provide_ingress=False)
+        LOGGER.debug(config)
+        headers = {}
+        headers["Content-Type"] = "application/json"
+        config_path = write_config(tmp_path, config.full_config)
+        with start_cloudflared(tmp_path, config, cfd_args=["run", "--hello-world"], new_process=True):
+            wait_tunnel_ready(tunnel_url=config.get_url(),
+                              require_min_connections=4)
+            cfd_cli = CloudflaredCli(config, config_path, LOGGER)
+            access_jwt = cfd_cli.get_management_token(config, config_path)
+            connector_id = cfd_cli.get_connector_id(config)[0]
+            url = f"{MANAGEMENT_HOST_NAME}/host_details?connector_id={connector_id}&access_token={access_jwt}"
+            resp = send_request(url, headers=headers)
+            
+            # Assert response json.
+            assert resp.status_code == 200, "Expected cloudflared to return 200 for host details"
+            assert resp.json()["hostname"] != "", "Expected cloudflared to return hostname"
+            assert resp.json()["ip"] != "", "Expected cloudflared to return ip"
+            assert resp.json()["connector_id"] == connector_id, "Expected cloudflared to return connector_id"
+
     
     def test_tunnel_url(self, tmp_path, component_tests_config):
         config = component_tests_config(cfd_mode=CfdModes.NAMED, run_proxy_dns=False, provide_ingress=False)
@@ -38,6 +73,6 @@ class TestTunnel:
 
 
 @retry(stop_max_attempt_number=MAX_RETRIES, wait_fixed=BACKOFF_SECS * 1000)
-def send_request(url):
+def send_request(url, headers={}):
     with requests.Session() as s:
-        return s.get(url, timeout=BACKOFF_SECS)
+        return s.get(url, timeout=BACKOFF_SECS, headers=headers)