| 1 | module.exports.validCloudFormationEvent = validCloudFormationEvent;
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| 2 |
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| 3 | /**
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| 4 | * Determines if an invocation event originated from CloudFormation
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| 5 | * @param {object} event - a Lambda invocation event
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| 6 | * @returns {boolean} indication of whether the event originated from CloudFormation
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| 7 | * @private
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| 8 | */
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| 9 | function validCloudFormationEvent(event) {
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| 10 | var required = [
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| 11 | 'RequestType',
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| 12 | 'ResourceProperties',
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| 13 | 'StackId',
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| 14 | 'LogicalResourceId',
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| 15 | 'RequestId',
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| 16 | 'ResponseURL'
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| 17 | ];
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| 18 |
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| 19 | return required.reduce(function(valid, key) {
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| 20 | if (!(key in event)) return false;
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| 21 | return key;
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| 22 | }, true);
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| 23 | }
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