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fix: restored the compact layer (#126)
* fix: restored the compact layer * fix: linter issue
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// @ts-nocheck | ||
/** | ||
* Credits to https://github.com/danielcondemarin | ||
* https://github.com/danielcondemarin/serverless-nextjs-plugin/blob/master/packages/next-aws-lambda/lib/compatLayer.js | ||
*/ | ||
const Stream = require("stream"); | ||
const queryString = require("querystring"); | ||
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const requestResponseMapper = (event, callback) => { | ||
const base64Support = process.env.BINARY_SUPPORT === "yes"; | ||
const response = { | ||
body: Buffer.from(""), | ||
isBase64Encoded: base64Support, | ||
statusCode: 200, | ||
multiValueHeaders: {} | ||
}; | ||
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const request = new Stream.Readable(); | ||
request.url = (event.requestContext.path || event.path || "").replace(new RegExp("^/" + event.requestContext.stage), ""); | ||
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let qs = ""; | ||
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if (event.multiValueQueryStringParameters) { | ||
qs += queryString.stringify(event.multiValueQueryStringParameters); | ||
} | ||
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if (event.pathParameters) { | ||
const pathParametersQs = queryString.stringify(event.pathParameters); | ||
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if (qs.length > 0) { | ||
qs += `&${pathParametersQs}`; | ||
} else { | ||
qs += pathParametersQs; | ||
} | ||
} | ||
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const hasQueryString = qs.length > 0; | ||
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if (hasQueryString) { | ||
request.url += `?${qs}`; | ||
} | ||
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request.method = event.httpMethod; | ||
request.rawHeaders = []; | ||
request.headers = {}; | ||
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const headers = event.multiValueHeaders || {}; | ||
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for (const key of Object.keys(headers)) { | ||
for (const value of headers[key]) { | ||
request.rawHeaders.push(key); | ||
request.rawHeaders.push(value); | ||
} | ||
request.headers[key.toLowerCase()] = headers[key].toString(); | ||
} | ||
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request.getHeader = name => { | ||
return request.headers[name.toLowerCase()]; | ||
}; | ||
request.getHeaders = () => { | ||
return request.headers; | ||
}; | ||
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request.connection = {}; | ||
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// eslint-disable-next-line unicorn/prevent-abbreviations | ||
const res = new Stream(); | ||
Object.defineProperty(res, "statusCode", { | ||
get() { | ||
return response.statusCode; | ||
}, | ||
set(statusCode) { | ||
response.statusCode = statusCode; | ||
} | ||
}); | ||
res.headers = {}; | ||
res.writeHead = (status, headers) => { | ||
response.statusCode = status; | ||
if (headers) res.headers = Object.assign(res.headers, headers); | ||
}; | ||
res.write = chunk => { | ||
response.body = Buffer.concat([response.body, Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk)]); | ||
}; | ||
res.setHeader = (name, value) => { | ||
res.headers[name] = value; | ||
}; | ||
res.removeHeader = name => { | ||
delete res.headers[name]; | ||
}; | ||
res.getHeader = name => { | ||
return res.headers[name.toLowerCase()]; | ||
}; | ||
res.getHeaders = () => { | ||
return res.headers; | ||
}; | ||
res.end = text => { | ||
if (text) res.write(text); | ||
response.body = Buffer.from(response.body).toString(base64Support ? "base64" : undefined); | ||
response.multiValueHeaders = res.headers; | ||
res.writeHead(response.statusCode); | ||
fixApiGatewayMultipleHeaders(); | ||
callback(null, response); | ||
}; | ||
if (event.body) { | ||
request.push(event.body, event.isBase64Encoded ? "base64" : undefined); | ||
request.push(null); | ||
} | ||
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// eslint-disable-next-line unicorn/consistent-function-scoping | ||
function fixApiGatewayMultipleHeaders() { | ||
for (const key of Object.keys(response.multiValueHeaders)) { | ||
if (!Array.isArray(response.multiValueHeaders[key])) { | ||
response.multiValueHeaders[key] = [response.multiValueHeaders[key]]; | ||
} | ||
} | ||
} | ||
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// eslint-disable-next-line unicorn/prevent-abbreviations | ||
return { req: request, res }; | ||
}; | ||
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module.exports = requestResponseMapper; |
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