39 lines
1.6 KiB
JavaScript
39 lines
1.6 KiB
JavaScript
"use strict"
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Object.defineProperty(exports, "__esModule", { value: true })
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const DEFAULT_MAX_AGE = 180 * 24 * 60 * 60
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function parseMaxAge(value = DEFAULT_MAX_AGE) {
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if (value >= 0 && Number.isFinite(value)) {
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return Math.floor(value)
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} else {
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throw new Error(`Strict-Transport-Security: ${JSON.stringify(value)} is not a valid value for maxAge. Please choose a positive integer.`)
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}
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}
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function getHeaderValueFromOptions(options) {
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if ("maxage" in options) {
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throw new Error("Strict-Transport-Security received an unsupported property, `maxage`. Did you mean to pass `maxAge`?")
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}
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if ("includeSubdomains" in options) {
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console.warn('Strict-Transport-Security middleware should use `includeSubDomains` instead of `includeSubdomains`. (The correct one has an uppercase "D".)')
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}
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if ("setIf" in options) {
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console.warn("Strict-Transport-Security middleware no longer supports the `setIf` parameter. See the documentation and <https://github.com/helmetjs/helmet/wiki/Conditionally-using-middleware> if you need help replicating this behavior.")
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}
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const directives = [`max-age=${parseMaxAge(options.maxAge)}`]
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if (options.includeSubDomains === undefined || options.includeSubDomains) {
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directives.push("includeSubDomains")
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}
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if (options.preload) {
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directives.push("preload")
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}
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return directives.join("; ")
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}
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function strictTransportSecurity(options = {}) {
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const headerValue = getHeaderValueFromOptions(options)
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return function strictTransportSecurityMiddleware(_req, res, next) {
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res.setHeader("Strict-Transport-Security", headerValue)
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next()
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}
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}
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module.exports = strictTransportSecurity
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exports.default = strictTransportSecurity
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