File size: 6,161 Bytes
a5d718a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | // src/middleware/secure-headers/secure-headers.ts
import { encodeBase64 } from "../../utils/encode.js";
var HEADERS_MAP = {
crossOriginEmbedderPolicy: ["Cross-Origin-Embedder-Policy", "require-corp"],
crossOriginResourcePolicy: ["Cross-Origin-Resource-Policy", "same-origin"],
crossOriginOpenerPolicy: ["Cross-Origin-Opener-Policy", "same-origin"],
originAgentCluster: ["Origin-Agent-Cluster", "?1"],
referrerPolicy: ["Referrer-Policy", "no-referrer"],
strictTransportSecurity: ["Strict-Transport-Security", "max-age=15552000; includeSubDomains"],
xContentTypeOptions: ["X-Content-Type-Options", "nosniff"],
xDnsPrefetchControl: ["X-DNS-Prefetch-Control", "off"],
xDownloadOptions: ["X-Download-Options", "noopen"],
xFrameOptions: ["X-Frame-Options", "SAMEORIGIN"],
xPermittedCrossDomainPolicies: ["X-Permitted-Cross-Domain-Policies", "none"],
xXssProtection: ["X-XSS-Protection", "0"]
};
var DEFAULT_OPTIONS = {
crossOriginEmbedderPolicy: false,
crossOriginResourcePolicy: true,
crossOriginOpenerPolicy: true,
originAgentCluster: true,
referrerPolicy: true,
strictTransportSecurity: true,
xContentTypeOptions: true,
xDnsPrefetchControl: true,
xDownloadOptions: true,
xFrameOptions: true,
xPermittedCrossDomainPolicies: true,
xXssProtection: true,
removePoweredBy: true,
permissionsPolicy: {}
};
var generateNonce = () => {
const arrayBuffer = new Uint8Array(16);
crypto.getRandomValues(arrayBuffer);
return encodeBase64(arrayBuffer.buffer);
};
var NONCE = (ctx) => {
const key = "secureHeadersNonce";
const init = ctx.get(key);
const nonce = init || generateNonce();
if (init == null) {
ctx.set(key, nonce);
}
return `'nonce-${nonce}'`;
};
var secureHeaders = (customOptions) => {
const options = { ...DEFAULT_OPTIONS, ...customOptions };
const headersToSet = getFilteredHeaders(options);
const callbacks = [];
if (options.contentSecurityPolicy) {
const [callback, value] = getCSPDirectives(options.contentSecurityPolicy);
if (callback) {
callbacks.push(callback);
}
headersToSet.push(["Content-Security-Policy", value]);
}
if (options.contentSecurityPolicyReportOnly) {
const [callback, value] = getCSPDirectives(options.contentSecurityPolicyReportOnly);
if (callback) {
callbacks.push(callback);
}
headersToSet.push(["Content-Security-Policy-Report-Only", value]);
}
if (options.permissionsPolicy && Object.keys(options.permissionsPolicy).length > 0) {
headersToSet.push([
"Permissions-Policy",
getPermissionsPolicyDirectives(options.permissionsPolicy)
]);
}
if (options.reportingEndpoints) {
headersToSet.push(["Reporting-Endpoints", getReportingEndpoints(options.reportingEndpoints)]);
}
if (options.reportTo) {
headersToSet.push(["Report-To", getReportToOptions(options.reportTo)]);
}
return async function secureHeaders2(ctx, next) {
const headersToSetForReq = callbacks.length === 0 ? headersToSet : callbacks.reduce((acc, cb) => cb(ctx, acc), headersToSet);
await next();
setHeaders(ctx, headersToSetForReq);
if (options?.removePoweredBy) {
ctx.res.headers.delete("X-Powered-By");
}
};
};
function getFilteredHeaders(options) {
return Object.entries(HEADERS_MAP).filter(([key]) => options[key]).map(([key, defaultValue]) => {
const overrideValue = options[key];
return typeof overrideValue === "string" ? [defaultValue[0], overrideValue] : defaultValue;
});
}
function getCSPDirectives(contentSecurityPolicy) {
const callbacks = [];
const resultValues = [];
for (const [directive, value] of Object.entries(contentSecurityPolicy)) {
const valueArray = Array.isArray(value) ? value : [value];
valueArray.forEach((value2, i) => {
if (typeof value2 === "function") {
const index = i * 2 + 2 + resultValues.length;
callbacks.push((ctx, values) => {
values[index] = value2(ctx, directive);
});
}
});
resultValues.push(
directive.replace(
/[A-Z]+(?![a-z])|[A-Z]/g,
(match, offset) => offset ? "-" + match.toLowerCase() : match.toLowerCase()
),
...valueArray.flatMap((value2) => [" ", value2]),
"; "
);
}
resultValues.pop();
return callbacks.length === 0 ? [void 0, resultValues.join("")] : [
(ctx, headersToSet) => headersToSet.map((values) => {
if (values[0] === "Content-Security-Policy" || values[0] === "Content-Security-Policy-Report-Only") {
const clone = values[1].slice();
callbacks.forEach((cb) => {
cb(ctx, clone);
});
return [values[0], clone.join("")];
} else {
return values;
}
}),
resultValues
];
}
function getPermissionsPolicyDirectives(policy) {
return Object.entries(policy).map(([directive, value]) => {
const kebabDirective = camelToKebab(directive);
if (typeof value === "boolean") {
return `${kebabDirective}=${value ? "*" : "none"}`;
}
if (Array.isArray(value)) {
if (value.length === 0) {
return `${kebabDirective}=()`;
}
if (value.length === 1 && (value[0] === "*" || value[0] === "none")) {
return `${kebabDirective}=${value[0]}`;
}
const allowlist = value.map((item) => ["self", "src"].includes(item) ? item : `"${item}"`);
return `${kebabDirective}=(${allowlist.join(" ")})`;
}
return "";
}).filter(Boolean).join(", ");
}
function camelToKebab(str) {
return str.replace(/([a-z\d])([A-Z])/g, "$1-$2").toLowerCase();
}
function getReportingEndpoints(reportingEndpoints = []) {
return reportingEndpoints.map((endpoint) => `${endpoint.name}="${endpoint.url}"`).join(", ");
}
function getReportToOptions(reportTo = []) {
return reportTo.map((option) => JSON.stringify(option)).join(", ");
}
function setHeaders(ctx, headersToSet) {
headersToSet.forEach(([header, value]) => {
ctx.res.headers.set(header, value);
});
}
export {
NONCE,
secureHeaders
};
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