105 lines
3 KiB
TypeScript
105 lines
3 KiB
TypeScript
import * as crypto from 'crypto';
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import { URL } from 'url';
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type Request = {
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url: string;
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method: string;
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headers: Record<string, string>;
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};
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type PrivateKey = {
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privateKeyPem: string;
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keyId: string;
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};
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export function createSignedPost(args: { key: PrivateKey, url: string, body: string, additionalHeaders: Record<string, string> }) {
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const u = new URL(args.url);
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const digestHeader = `SHA-256=${crypto.createHash('sha256').update(args.body).digest('base64')}`;
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const request: Request = {
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url: u.href,
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method: 'POST',
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headers: objectAssignWithLcKey({
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'Date': new Date().toUTCString(),
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'Host': u.hostname,
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'Content-Type': 'application/activity+json',
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'Digest': digestHeader,
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}, args.additionalHeaders),
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};
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const result = signToRequest(request, args.key, ['(request-target)', 'date', 'host', 'digest']);
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return {
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request,
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signingString: result.signingString,
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signature: result.signature,
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signatureHeader: result.signatureHeader,
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};
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}
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export function createSignedGet(args: { key: PrivateKey, url: string, additionalHeaders: Record<string, string> }) {
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const u = new URL(args.url);
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const request: Request = {
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url: u.href,
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method: 'GET',
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headers: objectAssignWithLcKey({
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'Accept': 'application/activity+json, application/ld+json',
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'Date': new Date().toUTCString(),
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'Host': new URL(args.url).hostname,
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}, args.additionalHeaders),
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};
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const result = signToRequest(request, args.key, ['(request-target)', 'date', 'host', 'accept']);
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return {
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request,
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signingString: result.signingString,
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signature: result.signature,
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signatureHeader: result.signatureHeader,
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};
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}
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function signToRequest(request: Request, key: PrivateKey, includeHeaders: string[]) {
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const signingString = genSigningString(request, includeHeaders);
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const signature = crypto.sign('sha256', Buffer.from(signingString), key.privateKeyPem).toString('base64');
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const signatureHeader = `keyId="${key.keyId}",algorithm="rsa-sha256",headers="${includeHeaders.join(' ')}",signature="${signature}"`;
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request.headers = objectAssignWithLcKey(request.headers, {
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Signature: signatureHeader,
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});
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return {
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request,
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signingString,
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signature,
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signatureHeader,
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};
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}
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function genSigningString(request: Request, includeHeaders: string[]) {
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request.headers = lcObjectKey(request.headers);
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const results: string[] = [];
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for (const key of includeHeaders.map(x => x.toLowerCase())) {
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if (key === '(request-target)') {
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results.push(`(request-target): ${request.method.toLowerCase()} ${new URL(request.url).pathname}`);
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} else {
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results.push(`${key}: ${request.headers[key]}`);
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}
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}
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return results.join('\n');
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}
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function lcObjectKey(src: Record<string, string>) {
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const dst: Record<string, string> = {};
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for (const key of Object.keys(src).filter(x => x != '__proto__' && typeof src[x] === 'string')) dst[key.toLowerCase()] = src[key];
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return dst;
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}
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function objectAssignWithLcKey(a: Record<string, string>, b: Record<string, string>) {
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return Object.assign(lcObjectKey(a), lcObjectKey(b));
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}
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