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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIURI;

[scriptable, uuid(68067eb5-ad8d-43cb-a043-1cc85ebe06e7)]
interface nsIEffectiveTLDService : nsISupports
{
    /**
     * Returns the public suffix of a URI. A public suffix is the highest-level domain
     * under which individual domains may be registered; it may therefore contain one
     * or more dots. For example, the public suffix for "www.bbc.co.uk" is "co.uk",
     * because the .uk TLD does not allow the registration of domains at the
     * second level ("bbc.uk" is forbidden).
     *
     * The public suffix will be returned encoded in ASCII/ACE and will be normalized
     * according to RFC 3454, i.e. the same encoding returned by nsIURI::GetAsciiHost().
     * If consumers wish to compare the result of this method against the host from
     * another nsIURI, the host should be obtained using nsIURI::GetAsciiHost().
     * In the case of nested URIs, the innermost URI will be used.
     *
     * @param   aURI   The URI to be analyzed
     *
     * @returns the public suffix
     *
     * @throws NS_ERROR_UNEXPECTED 
     *         or other error returned by nsIIDNService::normalize when 
     *         the hostname contains characters disallowed in URIs
     * @throws NS_ERROR_HOST_IS_IP_ADDRESS
     *         if the host is a numeric IPv4 or IPv6 address (as determined by
     *         the success of a call to PR_StringToNetAddr()).
     */
    ACString getPublicSuffix(in nsIURI aURI);

    /**
     * Returns the base domain of a URI; that is, the public suffix with a given
     * number of additional domain name parts. For example, the result of this method
     * for "www.bbc.co.uk", depending on the value of aAdditionalParts parameter, will
     * be:
     *
     *    0 (default) -> bbc.co.uk
     *    1           -> www.bbc.co.uk
     *
     * Similarly, the public suffix for "www.developer.mozilla.org" is "org", and the base
     * domain will be:
     *
     *    0 (default) -> mozilla.org
     *    1           -> developer.mozilla.org
     *    2           -> www.developer.mozilla.org
     *
     * The base domain will be returned encoded in ASCII/ACE and will be normalized
     * according to RFC 3454, i.e. the same encoding returned by nsIURI::GetAsciiHost().
     * If consumers wish to compare the result of this method against the host from
     * another nsIURI, the host should be obtained using nsIURI::GetAsciiHost().
     * In the case of nested URIs, the innermost URI will be used.
     *
     * @param   aURI               The URI to be analyzed
     * @param   aAdditionalParts   Number of domain name parts to be
     *                             returned in addition to the public suffix
     *
     * @returns the base domain (public suffix plus the requested number of additional parts)
     *
     * @throws NS_ERROR_UNEXPECTED 
     *         or other error returned by nsIIDNService::normalize when 
     *         the hostname contains characters disallowed in URIs
     * @throws NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS
     *         when there are insufficient subdomain levels in the hostname to satisfy the
     *         requested aAdditionalParts value.
     * @throws NS_ERROR_HOST_IS_IP_ADDRESS
     *         if aHost is a numeric IPv4 or IPv6 address (as determined by
     *         the success of a call to PR_StringToNetAddr()).
     *
     * @see    getPublicSuffix()
     */
    ACString getBaseDomain(in nsIURI aURI, [optional] in uint32_t aAdditionalParts);

    /**
     * NOTE: It is strongly recommended to use getPublicSuffix() above if a suitable
     * nsIURI is available. Only use this method if this is not the case.
     *
     * Returns the public suffix of a host string. Otherwise identical to getPublicSuffix().
     *
     * @param   aHost   The host to be analyzed. Any additional parts (e.g. scheme,
     *                  port, or path) will cause this method to throw. ASCII/ACE and
     *                  UTF8 encodings are acceptable as input; normalization will
     *                  be performed as specified in getBaseDomain().
     *
     * @see     getPublicSuffix()
     */
    ACString getPublicSuffixFromHost(in AUTF8String aHost);

    /**
     * NOTE: It is strongly recommended to use getBaseDomain() above if a suitable
     * nsIURI is available. Only use this method if this is not the case.
     *
     * Returns the base domain of a host string. Otherwise identical to getBaseDomain().
     *
     * @param   aHost   The host to be analyzed. Any additional parts (e.g. scheme,
     *                  port, or path) will cause this method to throw. ASCII/ACE and
     *                  UTF8 encodings are acceptable as input; normalization will
     *                  be performed as specified in getBaseDomain().
     *
     * @see     getBaseDomain()
     */
    ACString getBaseDomainFromHost(in AUTF8String aHost, [optional] in uint32_t aAdditionalParts);

    /**
     * Returns the parent sub-domain of a host string. If the host is a base
     * domain, it will throw NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS.
     *
     * For example: "player.bbc.co.uk" would return "bbc.co.uk" and
     *              "bbc.co.uk" would throw NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS.
     *
     * @param   aHost   The host to be analyzed. Any additional parts (e.g. scheme,
     *                  port, or path) will cause this method to throw. ASCII/ACE and
     *                  UTF8 encodings are acceptable as input; normalization will
     *                  be performed as specified in getBaseDomain().
     */
    ACString getNextSubDomain(in AUTF8String aHost);
};