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request.text();\n\n const calculatedSignature = createHmac(\"sha256\", signingKey).update(body).digest(\"base64\");\n\n if (!timingSafeEqual(Buffer.from(xXeroSignature), Buffer.from(calculatedSignature))) {\n console.warn(\"Signatures do not match.\");\n throw forbidden();\n }\n\n return next(request);\n };\n };\n}\n\ntype Chain = {\n add: (middleware: Middleware) => Promise;\n send: (response: Response) => Handler;\n};\n\nfunction chain(): Promise {\n const stack = new Set();\n\n async function getChain(): Promise {\n return { add, send };\n }\n\n const add: Chain[\"add\"] = (middleware) => {\n stack.add(middleware);\n return getChain();\n };\n\n const send: Chain[\"send\"] = (defaultResponse) => {\n return async (request) => {\n const queue = Array.from(stack);\n let response = defaultResponse;\n let middleware: Middleware | undefined;\n let happy = true;\n\n async function loop() {\n middleware = queue.shift();\n\n if (!middleware) {\n return;\n }\n\n const handler = middleware(async () => response);\n\n try {\n response = await handler(request);\n } catch (err) {\n happy = false;\n\n if (err instanceof Response) {\n response = err;\n return;\n }\n\n console.error(String(err));\n\n response = new Response(\"An unknown error has occurred.\", {\n status: 500,\n statusText: \"Internal Server Error\",\n });\n }\n }\n\n do {\n await loop();\n } while (happy && middleware);\n\n return response;\n };\n };\n\n return getChain();\n}\n\nfunction add(middleware: Middleware) {\n return function({ add }: Chain) {\n return add(middleware);\n };\n}\n\nfunction send(response: Response) {\n return function({ send }: Chain) {\n return send(response);\n };\n}\n\nexport default await chain()\n .then(add(requireMethod(\"POST\")))\n .then(add(validateSignature(XERO_WEBHOOK_SIGNING_KEY)))\n .then(send(success()));","import { Buffer } from \"node:buffer\";\nimport { createHmac, timingSafeEqual } from \"node:crypto\";\n\nconst XERO_WEBHOOK_SIGNING_KEY = 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xXeroSignature = request.headers.get(\"x-xero-signature\") ?? \"\";\n const body = await request.text();\n\n const calculatedSignature = createHmac(\"sha256\", signingKey).update(body).digest(\"base64\");\n\n if (!timingSafeEqual(Buffer.from(xXeroSignature), Buffer.from(calculatedSignature))) {\n console.warn(\"Signatures do not match.\");\n throw forbidden();\n }\n\n return next(request);\n };\n };\n}\n\ntype Chain = {\n add: (middleware: Middleware) => Promise;\n send: (response: Response) => Handler;\n};\n\nfunction chain(): Promise {\n const stack = new Set();\n\n async function getChain(): Promise {\n return { add, send };\n }\n\n const add: Chain[\"add\"] = (middleware) => {\n stack.add(middleware);\n return getChain();\n };\n\n const send: Chain[\"send\"] = (defaultResponse) => {\n return async (request) => {\n const queue = Array.from(stack);\n let response = defaultResponse;\n let middleware: Middleware | undefined;\n let happy = true;\n\n async function loop() {\n middleware 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Diff · v42