Merge pull request #771 from open-webui/windows-native

feat: windows native start script

backend/start_windows.bat

+:: This method is not recommended, and we recommend you use the `start.sh` file with WSL instead.
+@echo off
+SETLOCAL ENABLEDELAYEDEXPANSION
+
+:: Get the directory of the current script
+SET "SCRIPT_DIR=%~dp0"
+cd /d "%SCRIPT_DIR%" || exit /b
+
+SET "KEY_FILE=.webui_secret_key"
+SET "PORT=%PORT:8080%"
+SET "WEBUI_SECRET_KEY=%WEBUI_SECRET_KEY%"
+SET "WEBUI_JWT_SECRET_KEY=%WEBUI_JWT_SECRET_KEY%"
+
+:: Check if WEBUI_SECRET_KEY and WEBUI_JWT_SECRET_KEY are not set
+IF "%WEBUI_SECRET_KEY%%WEBUI_JWT_SECRET_KEY%" == " " (
+    echo No WEBUI_SECRET_KEY provided
+
+    IF NOT EXIST "%KEY_FILE%" (
+        echo Generating WEBUI_SECRET_KEY
+        :: Generate a random value to use as a WEBUI_SECRET_KEY in case the user didn't provide one
+        SET /p WEBUI_SECRET_KEY=<nul
+        FOR /L %%i IN (1,1,12) DO SET /p WEBUI_SECRET_KEY=<!random!>>%KEY_FILE%
+        echo WEBUI_SECRET_KEY generated
+    )
+
+    echo Loading WEBUI_SECRET_KEY from %KEY_FILE%
+    SET /p WEBUI_SECRET_KEY=<%KEY_FILE%
+)
+
+:: Execute uvicorn
+SET "WEBUI_SECRET_KEY=%WEBUI_SECRET_KEY%"
+uvicorn main:app --host 0.0.0.0 --port "%PORT%" --forwarded-allow-ips '*'