feat: weblate version function

Change-Id: I27a6f8d6ada0028d17867ce6d443b99befb2bf06

tools/weblate/weblate_utils.py

@@ -12,11 +12,16 @@
 import json
 from urllib import parse
 
+import re
 import requests
+from typing import Optional
 
 import wlc
 from wlc import config as cfg
 
+# Supported Weblate version
+WEBLATE_SUPPORTED_VERSION = "5.4"
+
 
 class IniConfig(object):
     """Object that stores weblate.ini configuration.
@@ -26,6 +31,7 @@ class IniConfig(object):
     url: The URL of the Weblate server.
     key: The API key to use for authentication.
     _inifile: The path to the ini file to load values from (not public).
+
     """
 
     def __init__(self, inifile):
@@ -46,6 +52,7 @@ class WeblateRestService(object):
     key: The API key to use for authentication.
     headers: The HTTP headers to use for requests. Must contain the key.
     verify: Whether to verify SSL certificates.
+
     """
 
     def __init__(
@@ -64,6 +71,13 @@ class WeblateRestService(object):
         }
         self.verify = verify
 
+        current_version = self.get_weblate_cloud_version()
+        if not current_version.startswith(WEBLATE_SUPPORTED_VERSION):
+            raise ValueError(
+                "Unsupported server version: %(version)s.",
+                {"version": current_version}
+            )
+
     def _construct_url(self, url_fragment):
         return parse.urljoin(self.url, url_fragment)
 
@@ -98,3 +112,29 @@ class WeblateRestService(object):
             )
         except requests.exceptions.ConnectionError:
             raise ValueError("Connection error")
+
+    def _base_url(self) -> str:
+        parsed_url = parse.urlparse(self.url)
+        baseurl = f"{parsed_url.scheme}://{parsed_url.netloc}"
+
+        return baseurl
+
+    def get_weblate_cloud_version(self) -> Optional[str]:
+        """Function that retrieves Weblate version
+
+        Note that the information is not available via REST API as of now
+        so crawling the version via web page
+
+        """
+
+        request_url = self._base_url()
+        response = requests.get(request_url)
+        version_pattern = r"weblate-(\d+\.\d+)"
+
+        version_match = re.search(version_pattern, response.text)
+
+        if version_match:
+            version = version_match.group(1)
+            return version
+
+        return None