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/* 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"

%{ C++
#include "mozilla/BasePrincipal.h"
%}

interface nsICancelable;
interface nsIEventTarget;
interface nsIDNSRecord;
interface nsIDNSListener;

%{C++
#include "nsTArrayForwardDeclare.h"
namespace mozilla { namespace net {
    struct DNSCacheEntries;
} }
%}

[ptr] native EntriesArray(nsTArray<mozilla::net::DNSCacheEntries>);
[ref] native OriginAttributes(const mozilla::OriginAttributes);

/**
 * nsIDNSService
 */
[scriptable, builtinclass, uuid(de5642c6-61fc-4fcf-9a47-03226b0d4e21)]
interface nsIDNSService : nsISupports
{
    /**
     * kicks off an asynchronous host lookup.
     *
     * @param aHostName
     *        the hostname or IP-address-literal to resolve.
     * @param aFlags
     *        a bitwise OR of the RESOLVE_ prefixed constants defined below.
     * @param aListener
     *        the listener to be notified when the result is available.
     * @param aListenerTarget
     *        optional parameter (may be null).  if non-null, this parameter
     *        specifies the nsIEventTarget of the thread on which the
     *        listener's onLookupComplete should be called.  however, if this
     *        parameter is null, then onLookupComplete will be called on an
     *        unspecified thread (possibly recursively).
     * @param aOriginAttributes
     *        the originAttribute for this resolving, the DNS cache will be
     *        separated according to this originAttributes. This attribute is
     *        optional to avoid breaking add-ons.
     *
     * @return An object that can be used to cancel the host lookup.
     */
    [implicit_jscontext, optional_argc]
    nsICancelable asyncResolve(in AUTF8String       aHostName,
                               in unsigned long     aFlags,
                               in nsIDNSListener    aListener,
                               in nsIEventTarget    aListenerTarget,
                    [optional] in jsval aOriginAttributes);

    [notxpcom]
    nsresult asyncResolveNative(in AUTF8String       aHostName,
                                in unsigned long     aFlags,
                                in nsIDNSListener    aListener,
                                in nsIEventTarget    aListenerTarget,
                                in OriginAttributes  aOriginAttributes,
                                out nsICancelable    aResult);

    /**
      * kicks off an asynchronous host lookup by type, e.g. TXT.
      *
      * @param aHostName
      *        the hostname or IP-address-literal to resolve.
      * @param aType
      *        one of RESOLVE_TYPE_*.
      * @param aFlags
      *        a bitwise OR of the RESOLVE_ prefixed constants defined below
      *        except RESOLVE_CANONICAL_NAME, RESOLVE_DISABLE_IPV6 and
      *        RESOLVE_DISABLE_IPV4.
      * @param aListener
      *        the listener to be notified when the result is available.
      * @param aListenerTarget
      *        optional parameter (may be null).  if non-null, this parameter
      *        specifies the nsIEventTarget of the thread on which the
      *        listener's onLookupComplete should be called.  however, if this
      *        parameter is null, then onLookupComplete will be called on an
      *        unspecified thread (possibly recursively).
      * @param aOriginAttributes
      *        the originAttribute for this resolving, the DNS cache will be
      *        separated according to this originAttributes.
      *
      * @return An object that can be used to cancel the host lookup.
      */
    [implicit_jscontext, optional_argc]
    nsICancelable asyncResolveByType(in AUTF8String       aHostName,
                                     in unsigned short    aType,
                                     in unsigned long     aFlags,
                                     in nsIDNSListener    aListener,
                                     in nsIEventTarget    aListenerTarget,
                                     in jsval             aOriginAttributes);

    [notxpcom]
    nsresult asyncResolveByTypeNative(in AUTF8String       aHostName,
                                      in unsigned short    aType,
                                      in unsigned long     aFlags,
                                      in nsIDNSListener    aListener,
                                      in nsIEventTarget    aListenerTarget,
                                      in OriginAttributes  aOriginAttributes,
                                      out nsICancelable    aResult);

    /**
     * Attempts to cancel a previously requested async DNS lookup
     *
     * @param aHostName
     *        the hostname or IP-address-literal to resolve.
     * @param aFlags
     *        a bitwise OR of the RESOLVE_ prefixed constants defined below.
     * @param aListener
     *        the original listener which was to be notified about the host lookup
     *        result - used to match request information to requestor.
     * @param aReason
     *        nsresult reason for the cancellation
     * @param aOriginAttributes
     *        the originAttribute for this resolving. This attribute is optional
     *        to avoid breaking add-ons.
     */
    [implicit_jscontext, optional_argc]
    void cancelAsyncResolve(in AUTF8String       aHostName,
                            in unsigned long     aFlags,
                            in nsIDNSListener    aListener,
                            in nsresult          aReason,
                 [optional] in jsval             aOriginAttributes);

    [notxpcom]
    nsresult cancelAsyncResolveNative(in AUTF8String       aHostName,
                                      in unsigned long     aFlags,
                                      in nsIDNSListener    aListener,
                                      in nsresult          aReason,
                                      in OriginAttributes  aOriginAttributes);

    /**
     * Attempts to cancel a previously requested async DNS lookup
     *
     * @param aHostName
     *        the hostname or IP-address-literal to resolve.
     * @param  aType
     *        one of RESOLVE_TYPE_*.
     * @param aFlags
     *        a bitwise OR of the RESOLVE_ prefixed constants defined below
     *        except RESOLVE_CANONICAL_NAME, RESOLVE_DISABLE_IPV6 and
     *        RESOLVE_DISABLE_IPV4.
     * @param aListener
     *        the original listener which was to be notified about the host lookup
     *        result - used to match request information to requestor.
     * @param aReason
     *        nsresult reason for the cancellation
     * @param aOriginAttributes
     *        the originAttribute for this resolving. This attribute is optional
     *        to avoid breaking add-ons.
     *
     */
     [implicit_jscontext, optional_argc]
     void cancelAsyncResolveByType(in AUTF8String       aHostName,
                                   in unsigned short    aType,
                                   in unsigned long     aFlags,
                                   in nsIDNSListener    aListener,
                                   in nsresult          aReason,
                                   in jsval             aOriginAttributes);

    [notxpcom]
    nsresult cancelAsyncResolveByTypeNative(in AUTF8String       aHostName,
                                            in unsigned short    aType,
                                            in unsigned long     aFlags,
                                            in nsIDNSListener    aListener,
                                            in nsresult          aReason,
                                            in OriginAttributes  aOriginAttributes);

    /**
     * called to synchronously resolve a hostname.
     *
     * Since this method may block the calling thread for a long period of
     * time, it may not be accessed from the main thread.
     *
     * @param aHostName
     *        the hostname or IP-address-literal to resolve.
     * @param aFlags
     *        a bitwise OR of the RESOLVE_ prefixed constants defined below.
     * @param aOriginAttributes
     *        the originAttribute for this resolving, the DNS cache will be
     *        separated according to this originAttributes. This attribute is
     *        optional to avoid breaking add-ons.
     *
     * @return DNS record corresponding to the given hostname.
     * @throws NS_ERROR_UNKNOWN_HOST if host could not be resolved.
     * @throws NS_ERROR_NOT_AVAILABLE if accessed from the main thread.
     */
    [implicit_jscontext, optional_argc]
    nsIDNSRecord resolve(in AUTF8String   aHostName,
                         in unsigned long aFlags,
              [optional] in jsval         aOriginAttributes);

    [notxpcom]
    nsresult resolveNative(in AUTF8String       aHostName,
                           in unsigned long     aFlags,
                           in OriginAttributes  aOriginAttributes,
                           out nsIDNSRecord     aResult);

    /**
     * The method takes a pointer to an nsTArray
     * and fills it with cache entry data
     * Called by the networking dashboard
     */
    [noscript] void getDNSCacheEntries(in EntriesArray args);


    /**
     * Clears the DNS cache.
     * @param aTrrToo
     *        If true we will clear TRR cached entries too. Since these
     *        are resolved remotely it's not necessary to clear them when
     *        the network status changes, but it's sometimes useful to do so
     *        for tests or other situations.
     */
    void clearCache(in boolean aTrrToo);

    /**
     * @return the hostname of the operating system.
     */
    readonly attribute AUTF8String myHostName;

    /*************************************************************************
     * Listed below are the various flags that may be OR'd together to form
     * the aFlags parameter passed to asyncResolve() and resolve().
     */

    /**
     * if set, this flag suppresses the internal DNS lookup cache.
     */
    const unsigned long RESOLVE_BYPASS_CACHE = (1 << 0);

    /**
     * if set, the canonical name of the specified host will be queried.
     */
    const unsigned long RESOLVE_CANONICAL_NAME = (1 << 1);

    /**
     * if set, the query is given lower priority. Medium takes precedence
     * if both are used.
     */
    const unsigned long RESOLVE_PRIORITY_MEDIUM = (1 << 2);
    const unsigned long RESOLVE_PRIORITY_LOW    = (1 << 3);

    /**
     * if set, indicates request is speculative. Speculative requests
     * return errors if prefetching is disabled by configuration.
     */
    const unsigned long RESOLVE_SPECULATE = (1 << 4);

    /**
     * If set, only IPv4 addresses will be returned from resolve/asyncResolve.
     */
    const unsigned long RESOLVE_DISABLE_IPV6 = (1 << 5);

    /**
     * If set, only literals and cached entries will be returned from resolve/
     * asyncResolve.
     */
    const unsigned long RESOLVE_OFFLINE = (1 << 6);

    /**
     * If set, only IPv6 addresses will be returned from resolve/asyncResolve.
     */
    const unsigned long RESOLVE_DISABLE_IPV4 = (1 << 7);

    /**
     * If set, allow name collision results (127.0.53.53) which are normally filtered.
     */
    const unsigned long RESOLVE_ALLOW_NAME_COLLISION = (1 << 8);

    /**
     * If set, do not use TRR for resolving the host name.
     */
    const unsigned long RESOLVE_DISABLE_TRR = (1 << 9);

    /**
     * if set (together with RESOLVE_BYPASS_CACHE), invalidate the DNS
     * existing cache entry first (if existing) then make a new resolve.
     */
    const unsigned long RESOLVE_REFRESH_CACHE = (1 << 10);

    /**
     * This ure dns request types that are currently supported.
     * RESOLVE_TYPE_DEFAULT is standard A/AAAA lookup
     * The others (currently only TXT supported) are wireformat types
     */
    const unsigned long RESOLVE_TYPE_DEFAULT = 0;
    const unsigned long RESOLVE_TYPE_TXT = 16;
};