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Prune both clear & wire content on redaction #2346

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merged 3 commits into from
May 5, 2022
Merged

Prune both clear & wire content on redaction #2346

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5460e5a
Apply redaction keep content map to encrypted event wire content
t3chguy May 4, 2022
28576e2
Simplify
t3chguy May 4, 2022
e0d4f4e
Add tests
t3chguy May 4, 2022
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27 changes: 27 additions & 0 deletions spec/unit/models/event.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -57,4 +57,31 @@ describe('MatrixEvent', () => {
expect(a.toSnapshot().isEquivalentTo(a)).toBe(true);
expect(a.toSnapshot().isEquivalentTo(b)).toBe(false);
});

it("should prune clearEvent when being redacted", () => {
const ev = new MatrixEvent({
type: "m.room.message",
content: {
body: "Test",
},
event_id: "$event1:server",
});

expect(ev.getContent().body).toBe("Test");
expect(ev.getWireContent().body).toBe("Test");
ev.makeEncrypted("m.room.encrypted", { ciphertext: "xyz" }, "", "");
expect(ev.getContent().body).toBe("Test");
expect(ev.getWireContent().body).toBeUndefined();
expect(ev.getWireContent().ciphertext).toBe("xyz");

const redaction = new MatrixEvent({
type: "m.room.redaction",
redacts: ev.getId(),
});

ev.makeRedacted(redaction);
expect(ev.getContent().body).toBeUndefined();
expect(ev.getWireContent().body).toBeUndefined();
expect(ev.getWireContent().ciphertext).toBeUndefined();
});
});
22 changes: 10 additions & 12 deletions src/models/event.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1112,23 +1112,21 @@ export class MatrixEvent extends TypedEventEmitter<EmittedEvents, MatrixEventHan
}
this.event.unsigned.redacted_because = redactionEvent.event as IEvent;

let key;
for (key in this.event) {
if (!this.event.hasOwnProperty(key)) {
continue;
}
if (!REDACT_KEEP_KEYS.has(key)) {
for (const key in this.event) {
if (this.event.hasOwnProperty(key) && !REDACT_KEEP_KEYS.has(key)) {
delete this.event[key];
}
}

// If the event is encrypted prune the decrypted bits
if (this.isEncrypted()) {
this.clearEvent = null;
}

const keeps = REDACT_KEEP_CONTENT_MAP[this.getType()] || {};
const content = this.getContent();
for (key in content) {
if (!content.hasOwnProperty(key)) {
continue;
}
if (!keeps[key]) {
for (const key in content) {
if (content.hasOwnProperty(key) && !keeps[key]) {
delete content[key];
}
}
Expand Down Expand Up @@ -1589,7 +1587,7 @@ const REDACT_KEEP_KEYS = new Set([
'content', 'unsigned', 'origin_server_ts',
]);

// a map from event type to the .content keys we keep when an event is redacted
// a map from state event type to the .content keys we keep when an event is redacted
const REDACT_KEEP_CONTENT_MAP = {
[EventType.RoomMember]: { 'membership': 1 },
[EventType.RoomCreate]: { 'creator': 1 },
Expand Down