Support for capitalized file extensions such as PDF

[shuruheel]

GPT-4: To allow capitalized file extensions, you can convert the file extension to lowercase before checking it against the file_processors dictionary in the filter_file function. Here's the modified filter_file function in the api.py file:

async def filter_file(file: UploadFile, enable_summarization: bool, supabase_client: Client):
    if await file_already_exists(supabase_client, file):
        return {"message": f"🤔 {file.filename} already exists.", "type": "warning"}
    elif file.file._file.tell() < 1:
        return {"message": f"❌ {file.filename} is empty.", "type": "error"}
    else:
        file_extension = os.path.splitext(file.filename)[-1].lower()  # Convert file extension to lowercase
        if file_extension in file_processors:
            await file_processors[file_extension](file, enable_summarization)
            return {"message": f"✅ {file.filename} has been uploaded.", "type": "success"}
        else:
            return {"message": f"❌ {file.filename} is not supported.", "type": "error"}

This change will ensure that capitalized file extensions are treated the same as their lowercase counterparts when checking against the file_processors dictionary.

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