/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "nsCOMPtr.h"

/**
 * Protocol handlers are registered with XPCOM under the following CONTRACTID prefix:
 */
#define NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "@mozilla.org/network/protocol;1?name="
/**
 * For example, "@mozilla.org/network/protocol;1?name=http"
 */

#if defined(MOZ_THUNDERBIRD) || defined(MOZ_SUITE)
#define IS_ORIGIN_IS_FULL_SPEC_DEFINED 1
#endif
%}

interface nsIURI;
interface nsIChannel;
interface nsILoadInfo;

/**
 * nsIProtocolHandlerWithDynamicFlags
 *
 * Protocols that wish to return different flags depending on the URI should
 * implement this interface.
 */
[scriptable, builtinclass, uuid(65a8e823-0591-4fc0-a56a-03265e0a4ce8)]
interface nsIProtocolHandlerWithDynamicFlags : nsISupports
{
    /*
     * Returns protocol flags for the given URI, which may be different from the
     * flags for another URI of the same scheme.
     *
     * Only DYNAMIC_URI_FLAGS may be different from the registered flags for the
     * protocol handler.
     */
    unsigned long getFlagsForURI(in nsIURI aURI);
};

/**
 * nsIProtocolHandler
 */
[scriptable, uuid(a87210e6-7c8c-41f7-864d-df809015193e)]
interface nsIProtocolHandler : nsISupports
{
    /**
     * The scheme of this protocol (e.g., "file").
     */
    readonly attribute ACString scheme;

    /**
     * Constructs a new channel from the given URI for this protocol handler and
     * sets the loadInfo for the constructed channel.
     */
    nsIChannel newChannel(in nsIURI aURI, in nsILoadInfo aLoadinfo);

    /**
     * Allows a protocol to override blacklisted ports.
     *
     * This method will be called when there is an attempt to connect to a port
     * that is blacklisted.  For example, for most protocols, port 25 (Simple Mail
     * Transfer) is banned.  When a URI containing this "known-to-do-bad-things"
     * port number is encountered, this function will be called to ask if the
     * protocol handler wants to override the ban.
     */
    boolean allowPort(in long port, in string scheme);


    /**************************************************************************
     * Constants for the protocol flags (the first is the default mask, the
     * others are deviations):
     *
     * NOTE: Protocol flags are provided when the protocol handler is
     * registered, either through a static component or dynamically with
     * `nsIIOService.registerProtocolHandler`.
     *
     * NOTE: Implementation must ignore any flags they do not understand.
     */

    /**
     * standard full URI with authority component and concept of relative
     * URIs (http, ...)
     */
    const unsigned long URI_STD = 0;

    /**
     * no concept of relative URIs (about, javascript, finger, ...)
     */
    const unsigned long URI_NORELATIVE = (1<<0);

    /**
     * no authority component (file, ...)
     */
    const unsigned long URI_NOAUTH = (1<<1);

    /**
     * This protocol handler can be proxied via a proxy (socks or http)
     * (e.g., irc, smtp, http, etc.).  If the protocol supports transparent
     * proxying, the handler should implement nsIProxiedProtocolHandler.
     *
     * If it supports only HTTP proxying, then it need not support
     * nsIProxiedProtocolHandler, but should instead set the ALLOWS_PROXY_HTTP
     * flag (see below).
     *
     * @see nsIProxiedProtocolHandler
     */
    const unsigned long ALLOWS_PROXY = (1<<2);

    /**
     * This protocol handler can be proxied using a http proxy (e.g., http,
     * etc.).  nsIIOService::newChannelFromURI will feed URIs from this
     * protocol handler to the HTTP protocol handler instead.  This flag is
     * ignored if ALLOWS_PROXY is not set.
     */
    const unsigned long ALLOWS_PROXY_HTTP = (1<<3);

    /**
     * The URIs for this protocol have no inherent security context, so
     * documents loaded via this protocol should inherit the security context
     * from the document that loads them.
     */
    const unsigned long URI_INHERITS_SECURITY_CONTEXT = (1<<4);

    /**
     * "Automatic" loads that would replace the document (e.g. <meta> refresh,
     * certain types of XLinks, possibly other loads that the application
     * decides are not user triggered) are not allowed if the originating (NOT
     * the target) URI has this protocol flag.  Note that the decision as to
     * what constitutes an "automatic" load is made externally, by the caller
     * of nsIScriptSecurityManager::CheckLoadURI.  See documentation for that
     * method for more information.
     *
     * A typical protocol that might want to set this flag is a protocol that
     * shows highly untrusted content in a viewing area that the user expects
     * to have a lot of control over, such as an e-mail reader.
     */
    const unsigned long URI_FORBIDS_AUTOMATIC_DOCUMENT_REPLACEMENT = (1<<5);

    /**
     * +-------------------------------------------------------------------+
     * |                                                                   |
     * |  ALL PROTOCOL HANDLERS MUST SET ONE OF THE FOLLOWING FIVE FLAGS.  |
     * |                                                                   |
     * +-------------------------------------------------------------------+
     *
     *    * URI_LOADABLE_BY_ANYONE
     *    * URI_DANGEROUS_TO_LOAD
     *    * URI_IS_UI_RESOURCE
     *    * URI_IS_LOCAL_FILE
     *    * URI_LOADABLE_BY_SUBSUMERS
     *
     * These flags are used to determine who is allowed to load URIs for this
     * protocol.  Note that if a URI is nested, only the flags for the
     * innermost URI matter.  See nsINestedURI.
     *
     * If none of these five flags are set, the ContentSecurityManager will
     * deny the load.
     */

    /**
     * The URIs for this protocol can be loaded by anyone.  For example, any
     * website should be allowed to trigger a load of a URI for this protocol.
     * Web-safe protocols like "http" should set this flag.
     */
    const unsigned long URI_LOADABLE_BY_ANYONE = (1<<6);

    /**
     * The URIs for this protocol are UNSAFE if loaded by untrusted (web)
     * content and may only be loaded by privileged code (for example, code
     * which has the system principal).  Various internal protocols should set
     * this flag.
     */
    const unsigned long URI_DANGEROUS_TO_LOAD = (1<<7);

    /**
     * The URIs for this protocol point to resources that are part of the
     * application's user interface.  There are cases when such resources may
     * be made accessible to untrusted content such as web pages, so this is
     * less restrictive than URI_DANGEROUS_TO_LOAD but more restrictive than
     * URI_LOADABLE_BY_ANYONE.  See the documentation for
     * nsIScriptSecurityManager::CheckLoadURI.
     */
    const unsigned long URI_IS_UI_RESOURCE = (1<<8);

    /**
     * Loading of URIs for this protocol from other origins should only be
     * allowed if those origins should have access to the local filesystem.
     * It's up to the application to decide what origins should have such
     * access.  Protocols like "file" that point to local data should set this
     * flag.
     */
    const unsigned long URI_IS_LOCAL_FILE = (1<<9);

    /**
     * The URIs for this protocol can be loaded only by callers with a
     * principal that subsumes this uri. For example, privileged code and
     * websites that are same origin as this uri.
     */
    const unsigned long URI_LOADABLE_BY_SUBSUMERS = (1<<10);

    /**
     * Channels using this protocol never call OnDataAvailable
     * on the listener passed to AsyncOpen and they therefore
     * do not return any data that we can use.
     */
    const unsigned long URI_DOES_NOT_RETURN_DATA = (1<<11);

    /**
     * URIs for this protocol are considered to be local resources.  This could
     * be a local file (URI_IS_LOCAL_FILE), a UI resource (URI_IS_UI_RESOURCE),
     * or something else that would not hit the network.
     */
    const unsigned long URI_IS_LOCAL_RESOURCE = (1<<12);

    /**
     * URIs for this protocol execute script when they are opened.
     */
    const unsigned long URI_OPENING_EXECUTES_SCRIPT = (1<<13);

    /**
     * Loading channels from this protocol has side-effects that make
     * it unsuitable for saving to a local file.
     */
    const unsigned long URI_NON_PERSISTABLE = (1<<14);

    /**
     * URIs for this protocol require the webapps permission on the principal
     * when opening URIs for a different domain. See bug#773886
     */
    const unsigned long URI_CROSS_ORIGIN_NEEDS_WEBAPPS_PERM = (1<<15);

    /**
     * Channels for this protocol don't need to spin the event loop to handle
     * Open() and reads on the resulting stream.
     */
    const unsigned long URI_SYNC_LOAD_IS_OK = (1<<16);

    /**
     * All the origins whose URI has this scheme are considered potentially
     * trustworthy.
     * Per the SecureContext spec, https: and wss: should be considered
     * a priori secure, and implementations may consider other,
     * implementation-specific URI schemes as secure.
     */
    const unsigned long URI_IS_POTENTIALLY_TRUSTWORTHY = (1<<17);

    /**
     * This URI may be fetched and the contents are visible to anyone. This is
     * semantically equivalent to the resource being served with all-access CORS
     * headers.  This is only used in MV2 Extensions and should not otherwise
     * be used.
     */
    const unsigned long URI_FETCHABLE_BY_ANYONE = (1 << 18);

    /**
     * If this flag is set, then the origin for this protocol is the full URI
     * spec, not just the scheme + host + port.
     *
     * Note: this is not supported in Firefox.  It is currently only available
     * in Thunderbird and SeaMonkey.
     */
    const unsigned long ORIGIN_IS_FULL_SPEC = (1 << 19);

    /**
     * If this flag is set, the URI does not always allow content using the same
     * protocol to link to it.
     */
    const unsigned long URI_SCHEME_NOT_SELF_LINKABLE = (1 << 20);

    /**
     * The URIs for this protocol can be loaded by extensions.
     */
    const unsigned long URI_LOADABLE_BY_EXTENSIONS = (1 << 21);

    /**
     * The URIs for this protocol can not be loaded into private contexts.
     */
    const unsigned long URI_DISALLOW_IN_PRIVATE_CONTEXT = (1 << 22);

    /**
     * This protocol handler forbids accessing cookies e.g. for mail related
     * protocols. Only used in Mailnews (comm-central).
     */
    const unsigned long URI_FORBIDS_COOKIE_ACCESS = (1 << 23);

    /**
     * This is an extension web accessible uri that is loadable if checked
     * against an allowlist using ExtensionPolicyService::SourceMayLoadExtensionURI.
     */
    const unsigned long WEBEXT_URI_WEB_ACCESSIBLE = (1 << 24);

    /**
     * This URI has a webexposed origin, meaning the URI has a non-null origin
     * See https://url.spec.whatwg.org/#origin
     */
    const unsigned long URI_HAS_WEB_EXPOSED_ORIGIN = (1 << 25);

    /**
     * Flags which are allowed to be different from the static flags when
     * returned from `nsIProtocolHandlerWithDynamicFlags::getFlagsForURI`.
     *
     * All other flags must match the flags provided when the protocol handler
     * was registered.
     */
    const unsigned long DYNAMIC_URI_FLAGS =
        URI_LOADABLE_BY_ANYONE | URI_DANGEROUS_TO_LOAD |
        URI_IS_POTENTIALLY_TRUSTWORTHY | URI_FETCHABLE_BY_ANYONE |
        URI_LOADABLE_BY_EXTENSIONS | URI_DISALLOW_IN_PRIVATE_CONTEXT |
        WEBEXT_URI_WEB_ACCESSIBLE | URI_HAS_WEB_EXPOSED_ORIGIN;
};