def mailer_settings_factory(settings, prefix='photoapp.mailer.'):
"""Returns the correctly configured specific implementation
of an IMailer object based on settings.
The specific implementation is determined by the `type`
setting, currently:
smtp:
send mail from SMTP server
console:
print mail messages to stdout (does not send any mail)
`console` is the default type.
Args:
settings: dict of settings
prefix: specific prefix to find mailer-specific settings
Returns:
IMailer instance
"""
classname = settings.get(prefix + 'class',
'photoapp.mail.SMTP_Mailer')
mailer_cls = DottedNameResolver().resolve(classname)
return mailer_cls.from_settings(settings, prefix)
