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import ldap
import barrel.basic

class LDAPAuth(barrel.basic.BasicAuth):
    realm = config.AUTH_REALM
    def __init__(self, url, domain, app):
        self.url = url
        self.domain = domain
        self.password_cache = {}
        barrel.basic.BasicAuth.__init__(self, app)

    def valid_user(self, username, password):
        if self.password_cache.get(username) == password:
            return True
        connection = ldap.initialize(self.url)
        try:
            connection.simple_bind_s(self.domain + username, password)
        except ldap.INVALID_CREDENTIALS:
            return False
        self.password_cache[username] = password
        return True