Trial The Third: Start rewriting the thing

Wooo, someone wants to use this! Let's make it less embarrassing.

itch_dl/api.py

@@ -0,0 +1,43 @@
+from typing import Optional
+
+from requests import Session
+from urllib3.util.retry import Retry
+from requests.adapters import HTTPAdapter
+
+from .consts import ITCH_API
+
+
+class ItchApiClient:
+    def __init__(self, api_key: str, base_url: Optional[str] = None):
+        self.base_url = base_url or ITCH_API
+        self.api_key = api_key
+
+        self.requests = Session()
+
+        retry_strategy = Retry(
+            total=5,
+            backoff_factor=10,
+            allowed_methods=["HEAD", "GET"],
+            status_forcelist=[429, 500, 502, 503, 504]
+        )
+
+        # No timeouts - set them explicitly on API calls below!
+        adapter = HTTPAdapter(max_retries=retry_strategy)
+        self.requests.mount("https://", adapter)
+        self.requests.mount("http://", adapter)
+
+    def get(self, endpoint: str, append_api_key: bool = True, **kwargs):
+        if append_api_key:
+            params = kwargs.get('data') or {}
+
+            if 'api_key' not in params:
+                params['api_key'] = self.api_key
+
+            kwargs['data'] = params
+
+        if endpoint.startswith("https://"):
+            url = endpoint
+        else:
+            url = self.base_url + endpoint
+
+        return self.requests.get(url, **kwargs)