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index.js
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index.js
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'use strict';
const path = require('path');
const fs = require('fs');
const EventEmitter = require('events').EventEmitter;
const requestHandler = require('./lib/request-handler');
const fetchTemplate = require('./lib/fetch-template');
const parseTemplate = require('./lib/parse-template');
const requestFragment = require('./lib/request-fragment');
const filterReqHeadersFn = require('./lib/filter-headers');
const { initTracer } = require('./lib/tracing');
const PIPE_DEFINITION = fs.readFileSync(
path.resolve(__dirname, 'src/pipe.min.js')
);
const { getCrossOrigin } = require('./lib/utils');
const AMD_LOADER_URL =
'https://cdnjs.cloudflare.com/ajax/libs/require.js/2.1.22/require.min.js';
const stripUrl = fileUrl => path.normalize(fileUrl.replace('file://', ''));
const getPipeAttributes = attributes => {
const { primary, id } = attributes;
return {
primary: !!(primary || primary === ''),
id
};
};
module.exports = class Tailor extends EventEmitter {
constructor(options) {
super();
const {
amdLoaderUrl = AMD_LOADER_URL,
filterRequestHeaders = options.filterHeaders || filterReqHeadersFn,
maxAssetLinks,
templatesPath
} = options;
options.maxAssetLinks = isNaN(maxAssetLinks)
? 1
: Math.max(1, maxAssetLinks);
let memoizedDefinition;
const pipeChunk = (pipeInstanceName, { host } = {}) => {
if (!memoizedDefinition) {
// Allow reading from fs for inlining AMD
if (amdLoaderUrl.startsWith('file://')) {
let fileData = fs.readFileSync(
stripUrl(amdLoaderUrl),
'utf-8'
);
memoizedDefinition = `<script>${fileData}\n`;
} else {
memoizedDefinition = `<script src="${amdLoaderUrl}" ${getCrossOrigin(
amdLoaderUrl,
host
)}></script>\n<script>`;
}
}
return Buffer.from(
`${memoizedDefinition}var ${pipeInstanceName}=${PIPE_DEFINITION}</script>\n`
);
};
const requestOptions = Object.assign(
{
amdLoaderUrl,
fetchContext: () => Promise.resolve({}),
fetchTemplate: fetchTemplate(
templatesPath || path.join(process.cwd(), 'templates')
),
fragmentTag: 'fragment',
handledTags: [],
handleTag: () => '',
requestFragment: requestFragment(filterRequestHeaders),
pipeInstanceName: 'Pipe',
pipeDefinition: pipeChunk,
pipeAttributes: getPipeAttributes
},
options
);
initTracer(options.tracer);
requestOptions.parseTemplate = parseTemplate(
[requestOptions.fragmentTag].concat(requestOptions.handledTags),
['script', requestOptions.fragmentTag]
);
this.requestHandler = requestHandler.bind(this, requestOptions);
// To Prevent from exiting the process - https://nodejs.org/api/events.html#events_error_events
this.on('error', () => {});
}
};