class ReportPayload models Model b64content models TextField blank Fal

class ReportPayload(models.Model):
    b64content = models.TextField(blank=False, null=False, editable=False)
    hsh = models.CharField(blank=False, null=False, editable=False)
    format = models.CharField(max_length=50, null=False, blank=False)
    report = models.ForeignKey(PrettyReport, related_name='payloads')
    
    def _get_content(self):
        assert self.hsh == sha.new(self.b64content).digest(), "Content seems to be corrupted"
        return base64.b64decode(self.b64content)
    
    def _set_content(self, value):
        self.b64content = base64.b64encode(value)
        self.hsh = sha.new(self.b64content).digest()
    
    content = property(get_content, set_content)