alexcasalboni · July 25, 2024 22:45 · alexcasalboni · Mar 30, 2017
diff --git a/aws-lambda-edge.md b/aws-lambda-edge.md
diff --git a/index.js b/index.js
 'use strict';
 const fs = require('fs');
 const zlib = require('zlib');
 const Plates = require('plates');
 const minify = require('html-minifier').minify;

 const supportedCompression = ['gzip', 'deflate'];

 exports.handler = (event, context, callback) => {

    const request = event.Records[0].cf.request;
    
    // read local file
    fs.readFile('/hook/unzipped' + request.uri.split('?')[0], function (err, data) {
        if (err) {
            callback(null, request);  // bypass Lambda@Edge
        } else {
            renderHTML(data.toString(), request, callback);
        }
    });
    
 };

 function renderHTML(html, request, callback) {

    const data = {
        "title": "This is a Lambda@Edge test!",
        "today": new Date().toString(),
    };

    // generate body and bind variables
    const body = minifyHTML(Plates.bind(html, data));

    // detect compression from request headers
    const compression = detectCompression(request);

    const response = {
        status: '200',
        statusDescription: 'HTTP OK',
        httpVersion: request.httpVersion,
        body: compressBody(body, compression),
        headers: {
            'Vary': ['*'],
            'Content-Type': ['text/html; charset=UTF-8'],
            'Last-Modified': ['2017-02-09'],
            'Content-Encoding': [compression || 'UTF-8']
        },
    };

    callback(null, response);  // return custom response
 }

 function minifyHTML(html) {
    return minify(html, {
        collapseWhitespace: true,
        removeComments: true,
    });
 }

 function detectCompression(request) {
    const accept = request.headers['Accept-Encoding'] || [];
    for(var i = 0; i < accept.length; i++) {
        if (supportedCompression.indexOf(accept[i]) !== -1) {
            return accept[i];  // return the first match
        }
    }
    return null;
 }

 function compressBody(body, compression) {
    if (compression === 'gzip') {
        return zlib.gzipSync(body).toString('utf8');
    } else if (compression === 'deflate') {
        return zlib.deflateSync(body).toString('utf8');
    } else {
        return body;  // no compression
    }
 }
diff --git a/node_modules.zip b/node_modules.zip
diff --git a/package.json b/package.json
 {
  "name": "gulp-htmlmin",
  "description": "AWS Lambda@Edge Experiment",
  "version": "0.0.1",
  "author": {
    "name": "Alex Casalboni",
    "url": "https://github.com/alexcasalboni/"
  },
  "dependencies": {
    "plates": "0.4.11",
    "html-minifier": "3.3.1"
  }
 }
diff --git a/test.html b/test.html
 <html>
    <head>
        <title>Test</title>
    </head>
    <body>
        <h1 id="title"></h1>
        <p id="today"></p>
    </body>
 </html>
	'use strict';
	const fs = require('fs');
	const zlib = require('zlib');
	const Plates = require('plates');
	const minify = require('html-minifier').minify;

	const supportedCompression = ['gzip', 'deflate'];

	exports.handler = (event, context, callback) => {

	const request = event.Records[0].cf.request;

	// read local file
	fs.readFile('/hook/unzipped' + request.uri.split('?')[0], function (err, data) {
	if (err) {
	callback(null, request); // bypass Lambda@Edge
	} else {
	renderHTML(data.toString(), request, callback);
	}
	});

	};

	function renderHTML(html, request, callback) {

	const data = {
	"title": "This is a Lambda@Edge test!",
	"today": new Date().toString(),
	};

	// generate body and bind variables
	const body = minifyHTML(Plates.bind(html, data));

	// detect compression from request headers
	const compression = detectCompression(request);

	const response = {
	status: '200',
	statusDescription: 'HTTP OK',
	httpVersion: request.httpVersion,
	body: compressBody(body, compression),
	headers: {
	'Vary': ['*'],
	'Content-Type': ['text/html; charset=UTF-8'],
	'Last-Modified': ['2017-02-09'],
	'Content-Encoding': [compression \|\| 'UTF-8']
	},
	};

	callback(null, response); // return custom response
	}

	function minifyHTML(html) {
	return minify(html, {
	collapseWhitespace: true,
	removeComments: true,
	});
	}

	function detectCompression(request) {
	const accept = request.headers['Accept-Encoding'] \|\| [];
	for(var i = 0; i < accept.length; i++) {
	if (supportedCompression.indexOf(accept[i]) !== -1) {
	return accept[i]; // return the first match
	}
	}
	return null;
	}

	function compressBody(body, compression) {
	if (compression === 'gzip') {
	return zlib.gzipSync(body).toString('utf8');
	} else if (compression === 'deflate') {
	return zlib.deflateSync(body).toString('utf8');
	} else {
	return body; // no compression
	}
	}
	{
	"name": "gulp-htmlmin",
	"description": "AWS Lambda@Edge Experiment",
	"version": "0.0.1",
	"author": {
	"name": "Alex Casalboni",
	"url": "https://github.com/alexcasalboni/"
	},
	"dependencies": {
	"plates": "0.4.11",
	"html-minifier": "3.3.1"
	}
	}
	<html>
	<head>
	<title>Test</title>
	</head>
	<body>
	<h1 id="title"></h1>
	<p id="today"></p>
	</body>
	</html>