/usr/share/idl/thunderbird/calIItipTransport.idl is in thunderbird-dev 1:52.8.0-1~deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | /* 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 calIItipItem;
interface calIAttendee;
interface calIDateTime;
/**
 * calIItipTransport is a generic transport interface that is implemented
 * by transports (eg: email, XMPP, etc.) wishing to send calIItipItems
 */
[scriptable, uuid(caedabb9-d886-4814-ada5-a5636d2fb939)]
interface calIItipTransport : nsISupports
{
    /**
     * Scheme to be used to prefix attendees. For example, the Email transport
     * should return "mailto".
     */
    readonly attribute AUTF8String scheme;
    /**
     * Sending identity. This can be set to change the "sender" identity from
     * defaultIdentity above.
     */
    attribute AUTF8String senderAddress;
    /**
     * Type of the transport: email, xmpp, etc.
     */
    readonly attribute AUTF8String type;
    /**
     * Sends a calIItipItem to the recipients using the specified title and
     * alternative representation. If a calIItipItem is attached, then an ICS
     * representation of those objects are generated and attached to the email.
     * If the calIItipItem is null, then the item(s) is sent without any
     * text/calendar mime part.
     * @param count             size of recipient array
     * @param recipientArray    array of recipients
     * @param calIItipItem      set of calIItems encapsulated as calIItipItems
     */
    boolean sendItems(in uint32_t count,
                      [array, size_is(count)] in calIAttendee recipientArray,
                      in calIItipItem item);
};
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