Validate File Size and Type

# forms.py

from django import forms

ALLOWED_TYPES = {"application/pdf", "text/plain"}
MAX_MB = 5

class DocumentForm(forms.Form):
    file = forms.FileField()

    def clean_file(self):
        f = self.cleaned_data["file"]
        if f.size > MAX_MB * 1024 * 1024:
            raise forms.ValidationError(f"File too large (>{MAX_MB} MB).")
        ctype = getattr(f, "content_type", None)
        if ctype not in ALLOWED_TYPES:
            raise forms.ValidationError("Only PDF or TXT files are allowed.")
        return f