Windows path fixes (#129)

* Change uses of os.path to use Pathlib

* Add return types and type hints

* Add more docstrings

* Add missing import to api_server

src/api/server_proxy.py

@@ -3,6 +3,7 @@ import logging
 import os
 import threading
 import time
+from pathlib import Path
 
 import requests
 from requests_toolbelt.multipart import MultipartEncoder, MultipartEncoderMonitor
@@ -184,12 +185,12 @@ class RenderServerProxy:
     # Job Lifecycle:
     # --------------------------------------------
 
-    def post_job_to_server(self, file_path, job_data, callback=None):
+    def post_job_to_server(self, file_path: Path, job_data, callback=None):
         """
         Posts a job to the server.
 
         Args:
-            file_path (str): The path to the file to upload.
+            file_path (Path): The path to the file to upload.
             job_data (dict): A dict of jobs data.
             callback (function, optional): A callback function to call during the upload. Defaults to None.
 
@@ -197,12 +198,12 @@ class RenderServerProxy:
             Response: The response from the server.
         """
         # Check if file exists
-        if not os.path.exists(file_path):
+        if not file_path.exists():
             raise FileNotFoundError(f"File not found: {file_path}")
 
         # Bypass uploading file if posting to localhost
         if self.is_localhost:
-            job_data['local_path'] = file_path
+            job_data['local_path'] = str(file_path)
             url = urljoin(f'http://{self.hostname}:{self.port}', '/api/add_job')
             headers = {'Content-Type': 'application/json'}
             return requests.post(url, data=json.dumps(job_data), headers=headers)
@@ -210,7 +211,7 @@ class RenderServerProxy:
         # Prepare the form data for remote host
         with open(file_path, 'rb') as file:
             encoder = MultipartEncoder({
-                'file': (os.path.basename(file_path), file, 'application/octet-stream'),
+                'file': (file_path.name, file, 'application/octet-stream'),
                 'json': (None, json.dumps(job_data), 'application/json'),
             })
 
@@ -247,7 +248,7 @@ class RenderServerProxy:
     # Engines:
     # --------------------------------------------
 
-    def get_engine_for_filename(self, filename, timeout=5):
+    def get_engine_for_filename(self, filename:str, timeout=5):
         response = self.request(f'engine_for_filename?filename={os.path.basename(filename)}', timeout)
         return response.text