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c0cecd71fe
no issue - When providing a crontab schedule expression it should always contain 6 elements first one of them being a "seconds" schedule description . For example: '0/5 * * * * *' - meaning to run every 5 seconds
37 lines
1.4 KiB
JavaScript
37 lines
1.4 KiB
JavaScript
const cronValidate = require('cron-validate');
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/**
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* Checks if expression follows supported crontab format
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* reference: https://www.adminschoice.com/crontab-quick-reference
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* builder: https://crontab.guru/
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*
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* e.g.:
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* "2 * * * *" where:
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*
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* "* * * * * *"
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* ┬ ┬ ┬ ┬ ┬ ┬
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* │ │ │ │ │ |
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* │ │ │ │ │ └ day of week (0 - 7) (0 or 7 is Sun)
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* │ │ │ │ └───── month (1 - 12)
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* │ │ │ └────────── day of month (1 - 31)
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* │ │ └─────────────── hour (0 - 23)
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* │ └──────────────────── minute (0 - 59)
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* └───────────────────────── second (0 - 59, optional)
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*
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* @param {String} expression in crontab format (https://www.gnu.org/software/mcron/manual/html_node/Crontab-file.html)
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*
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* @returns {boolean} wheather or not the expression is valid
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*/
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const isCronExpression = (expression) => {
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let cronResult = cronValidate(expression, {
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preset: 'default', // second field not supported in default preset
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override: {
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useSeconds: true // override preset option
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}
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});
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return cronResult.isValid();
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};
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module.exports = isCronExpression;
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