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RTCPeerConnection-setLocalDescription-offer.html
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RTCPeerConnection-setLocalDescription-offer.html
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<!doctype html>
<meta charset=utf-8>
<title>RTCPeerConnection.prototype.setLocalDescription</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
'use strict';
// Test is based on the following editor draft:
// https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html
// The following helper functions are called from RTCPeerConnection-helper.js:
// generateOffer
// assert_session_desc_not_similar
// assert_session_desc_similar
/*
4.3.2. Interface Definition
[Constructor(optional RTCConfiguration configuration)]
interface RTCPeerConnection : EventTarget {
Promise<void> setRemoteDescription(
RTCSessionDescriptionInit description);
readonly attribute RTCSessionDescription? remoteDescription;
readonly attribute RTCSessionDescription? currentRemoteDescription;
readonly attribute RTCSessionDescription? pendingRemoteDescription;
...
};
4.6.2. RTCSessionDescription Class
dictionary RTCSessionDescriptionInit {
required RTCSdpType type;
DOMString sdp = "";
};
4.6.1. RTCSdpType
enum RTCSdpType {
"offer",
"pranswer",
"answer",
"rollback"
};
*/
/*
4.3.2. setLocalDescription
2. Let lastOffer be the result returned by the last call to createOffer.
5. If description.sdp is null and description.type is offer, set description.sdp
to lastOffer.
4.3.1.6. Set the RTCSessionSessionDescription
2.2.2. If description is set as a local description, then run one of the following
steps:
- If description is of type "offer", set connection.pendingLocalDescription
to description and signaling state to have-local-offer.
*/
promise_test(t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
const states = [];
pc.addEventListener('signalingstatechange', () => states.push(pc.signalingState));
return pc.createOffer({ offerToReceiveAudio: true })
.then(offer =>
pc.setLocalDescription(offer)
.then(() => {
assert_equals(pc.signalingState, 'have-local-offer');
assert_session_desc_similar(pc.localDescription, offer);
assert_session_desc_similar(pc.pendingLocalDescription, offer);
assert_equals(pc.currentLocalDescription, null);
assert_array_equals(states, ['have-local-offer']);
}));
}, 'setLocalDescription with valid offer should succeed');
/*
4.3.2. setLocalDescription
2. Let lastOffer be the result returned by the last call to createOffer.
5. If description.sdp is null and description.type is offer, set description.sdp
to lastOffer.
*/
promise_test(t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
return pc.createOffer({ offerToReceiveAudio: true })
.then(offer =>
pc.setLocalDescription({ type: 'offer' })
.then(() => {
assert_equals(pc.signalingState, 'have-local-offer');
assert_session_desc_similar(pc.localDescription, offer);
assert_session_desc_similar(pc.pendingLocalDescription, offer);
assert_equals(pc.currentLocalDescription, null);
}));
}, 'setLocalDescription with type offer and null sdp should use lastOffer generated from createOffer');
/*
4.3.2. setLocalDescription
2. Let lastOffer be the result returned by the last call to createOffer.
6. If description.type is offer and description.sdp does not match lastOffer,
reject the promise with a newly created InvalidModificationError and abort
these steps.
*/
promise_test(t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
return generateOffer({ pc, data: true })
.then(offer =>
promise_rejects(t, 'InvalidModificationError',
pc2.setLocalDescription(offer)));
}, 'setLocalDescription() with offer not created by own createOffer() should reject with InvalidModificationError');
promise_test(t => {
// Create first offer with audio line, then second offer with
// both audio and video line. Since the second offer is the
// last offer, setLocalDescription would reject when setting
// with the first offer
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
return pc.createOffer({ offerToReceiveAudio: true })
.then(offer1 =>
pc.createOffer({ offerToReceiveVideo: true })
.then(offer2 => {
assert_session_desc_not_similar(offer1, offer2);
return promise_rejects(t, 'InvalidModificationError',
pc.setLocalDescription(offer1));
}));
}, 'Set created offer other than last offer should reject with InvalidModificationError');
promise_test(t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
const states = [];
pc.addEventListener('signalingstatechange', () => states.push(pc.signalingState));
return pc.createOffer({ offerToReceiveAudio: true })
.then(offer1 =>
pc.setLocalDescription(offer1)
.then(() =>
pc.createOffer({ offerToReceiveVideo: true })
.then(offer2 =>
pc.setLocalDescription(offer2)
.then(offer2 => {
assert_session_desc_not_similar(offer1, offer2);
assert_equals(pc.signalingState, 'have-local-offer');
assert_session_desc_similar(pc.localDescription, offer2);
assert_session_desc_similar(pc.pendingLocalDescription, offer2);
assert_equals(pc.currentLocalDescription, null);
assert_array_equals(states, ['have-local-offer']);
}))));
}, 'Creating and setting offer multiple times should succeed');
</script>