feat(proxies): add WindscribeVPN proxy provider support

Add WindscribeVPN as a new proxy provider option, following the same pattern as NordVPN and SurfsharkVPN implementations.

Fixes: #29

unshackle/core/proxies/__init__.py

@@ -2,5 +2,6 @@ from .basic import Basic
 from .hola import Hola
 from .nordvpn import NordVPN
 from .surfsharkvpn import SurfsharkVPN
+from .windscribevpn import WindscribeVPN
 
-__all__ = ("Basic", "Hola", "NordVPN", "SurfsharkVPN")
+__all__ = ("Basic", "Hola", "NordVPN", "SurfsharkVPN", "WindscribeVPN")

unshackle/core/proxies/windscribevpn.py

@@ -0,0 +1,99 @@
+import json
+import random
+import re
+from typing import Optional
+
+import requests
+
+from unshackle.core.proxies.proxy import Proxy
+
+
+class WindscribeVPN(Proxy):
+    def __init__(self, username: str, password: str, server_map: Optional[dict[str, str]] = None):
+        """
+        Proxy Service using WindscribeVPN Service Credentials.
+
+        A username and password must be provided. These are Service Credentials, not your Login Credentials.
+        The Service Credentials can be found here: https://windscribe.com/getconfig/openvpn
+        """
+        if not username:
+            raise ValueError("No Username was provided to the WindscribeVPN Proxy Service.")
+        if not password:
+            raise ValueError("No Password was provided to the WindscribeVPN Proxy Service.")
+
+        if server_map is not None and not isinstance(server_map, dict):
+            raise TypeError(f"Expected server_map to be a dict mapping a region to a hostname, not '{server_map!r}'.")
+
+        self.username = username
+        self.password = password
+        self.server_map = server_map or {}
+
+        self.countries = self.get_countries()
+
+    def __repr__(self) -> str:
+        countries = len(set(x.get("country_code") for x in self.countries if x.get("country_code")))
+        servers = sum(
+            len(host)
+            for location in self.countries
+            for group in location.get("groups", [])
+            for host in group.get("hosts", [])
+        )
+
+        return f"{countries} Countr{['ies', 'y'][countries == 1]} ({servers} Server{['s', ''][servers == 1]})"
+
+    def get_proxy(self, query: str) -> Optional[str]:
+        """
+        Get an HTTPS proxy URI for a WindscribeVPN server.
+        """
+        query = query.lower()
+
+        if query in self.server_map:
+            hostname = self.server_map[query]
+        else:
+            if re.match(r"^[a-z]+$", query):
+                hostname = self.get_random_server(query)
+            else:
+                raise ValueError(f"The query provided is unsupported and unrecognized: {query}")
+
+            if not hostname:
+                return None
+
+        return f"https://{self.username}:{self.password}@{hostname}:443"
+
+    def get_random_server(self, country_code: str) -> Optional[str]:
+        """
+        Get a random server hostname for a country.
+
+        Returns None if no servers are available for the country.
+        """
+        for location in self.countries:
+            if location.get("country_code", "").lower() == country_code.lower():
+                hostnames = []
+                for group in location.get("groups", []):
+                    for host in group.get("hosts", []):
+                        if hostname := host.get("hostname"):
+                            hostnames.append(hostname)
+
+                if hostnames:
+                    return random.choice(hostnames)
+
+        return None
+
+    @staticmethod
+    def get_countries() -> list[dict]:
+        """Get a list of available Countries and their metadata."""
+        res = requests.get(
+            url="https://assets.windscribe.com/serverlist/firefox/1/1",
+            headers={
+                "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36",
+                "Content-Type": "application/json",
+            },
+        )
+        if not res.ok:
+            raise ValueError(f"Failed to get a list of WindscribeVPN locations [{res.status_code}]")
+
+        try:
+            data = res.json()
+            return data.get("data", [])
+        except json.JSONDecodeError:
+            raise ValueError("Could not decode list of WindscribeVPN locations, not JSON data.")