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/**
* Tests that only whitelisted stages are permitted to run in a $changeStream pipeline.
*/
(function() {
"use strict";
load('jstests/aggregation/extras/utils.js'); // For assertErrorCode.
load("jstests/libs/collection_drop_recreate.js"); // For assert[Drop|Create]Collection.
const coll = assertDropAndRecreateCollection(db, "change_stream_whitelist");
// Bare-bones $changeStream pipeline which will be augmented during tests.
const changeStream = [{$changeStream: {}}];
// List of non-$changeStream stages which are explicitly whitelisted.
const whitelist = [
{$match: {_id: {$exists: true}}},
{$project: {_id: 1}},
{$addFields: {newField: 1}},
{$replaceRoot: {newRoot: {_id: "$_id"}}},
{$redact: "$$DESCEND"}
];
// List of stages which the whitelist mechanism will prevent from running in a $changeStream.
// Does not include stages which are blacklisted but already implicitly prohibited, e.g. both
// $currentOp and $changeStream must be the first stage in a pipeline.
const blacklist = [
{$group: {_id: "$_id"}},
{$sort: {_id: 1}},
{$skip: 100},
{$limit: 100},
{$sample: {size: 100}},
{$unwind: "$_id"},
{$lookup: {from: "coll", as: "as", localField: "_id", foreignField: "_id"}},
{
$graphLookup: {
from: "coll",
as: "as",
startWith: "$_id",
connectFromField: "_id",
connectToField: "_id"
}
},
{$bucketAuto: {groupBy: "$_id", buckets: 2}},
{$facet: {facetPipe: [{$match: {_id: {$exists: true}}}]}}
];
// Verify that each of the whitelisted stages are permitted to run in a $changeStream.
for (let allowedStage of whitelist) {
assert.commandWorked(db.runCommand(
{aggregate: coll.getName(), pipeline: changeStream.concat(allowedStage), cursor: {}}));
}
// Verify that all of the whitelisted stages are able to run in a $changeStream together.
assert.commandWorked(db.runCommand(
{aggregate: coll.getName(), pipeline: changeStream.concat(whitelist), cursor: {}}));
// Verify that a $changeStream pipeline fails to validate if a blacklisted stage is present.
for (let bannedStage of blacklist) {
assertErrorCode(coll, changeStream.concat(bannedStage), ErrorCodes.IllegalOperation);
}
}());
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