@arcjet/headers/index.js

Arcjet extension of the Headers class

function isIterable(val) {
    return typeof val?.[Symbol.iterator] === "function";
}
/**
 * Arcjet headers.
 *
 * This exists to prevent the `cookie` header from being set
 * and non-string values from being set.
 *
 * @see
 *   [MDN Reference](https://developer.mozilla.org/docs/Web/API/Headers).
 */
class ArcjetHeaders extends Headers {
    constructor(init) {
        super();
        if (typeof init !== "undefined" &&
            typeof init !== "string" &&
            init !== null) {
            if (isIterable(init)) {
                for (const [key, value] of init) {
                    this.append(key, value);
                }
            }
            else {
                for (const [key, value] of Object.entries(init)) {
                    if (typeof value === "undefined") {
                        continue;
                    }
                    if (Array.isArray(value)) {
                        for (const singleValue of value) {
                            this.append(key, singleValue);
                        }
                    }
                    else {
                        this.append(key, value);
                    }
                }
            }
        }
    }
    /**
     * Append a header while ignoring `cookie`.
     *
     * @see
     *   [MDN Reference](https://developer.mozilla.org/docs/Web/API/Headers/append)
     *
     * @param key
     *   Header name.
     * @param value
     *   Header value.
     * @returns
     *   Nothing.
     */
    append = (key, value) => {
        if (typeof key !== "string" || typeof value !== "string") {
            return;
        }
        if (key.toLowerCase() !== "cookie") {
            Headers.prototype.append.call(this, key, value);
        }
    };
    /**
     * Set a header while ignoring `cookie`.
     *
     * @see
     *   [MDN Reference](https://developer.mozilla.org/docs/Web/API/Headers/set)
     *
     * @param key
     *   Header key.
     * @param value
     *   Header value.
     * @returns
     *   Nothing.
     */
    set = (key, value) => {
        if (typeof key !== "string" || typeof value !== "string") {
            return;
        }
        if (key.toLowerCase() !== "cookie") {
            Headers.prototype.set.call(this, key, value);
        }
    };
}

export { ArcjetHeaders, ArcjetHeaders as default };