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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*/
const resolve = require('path').resolve;
const {writeFile} = require('fs-extra');
const readFileSync = require('fs').readFileSync;
const safeLoad = require('js-yaml').safeLoad;
const path = require('path');
const versionsFile = resolve(__dirname, '../../content/versions.yml');
const file = readFileSync(versionsFile, 'utf8');
const versions = safeLoad(file);
const redirectsFilePath = path.join('vercel.json');
function writeRedirectsFile(redirects, redirectsFilePath) {
if (!redirects.length) {
return null;
}
/**
* We will first read the old config to validate if the redirect already exists in the json
*/
const vercelConfigPath = resolve(__dirname, '../../vercel.json');
const vercelConfigFile = readFileSync(vercelConfigPath);
const oldConfigContent = JSON.parse(vercelConfigFile);
/**
* Map data as vercel expects it to be
*/
let vercelRedirects = {};
redirects.forEach((redirect) => {
const {fromPath, isPermanent, toPath} = redirect;
vercelRedirects[fromPath] = {
destination: toPath,
permanent: !!isPermanent,
};
});
/**
* Make sure we dont have the same redirect already
*/
oldConfigContent.redirects.forEach((data) => {
if(vercelRedirects[data.source]){
delete vercelRedirects[data.source];
}
});
/**
* Serialize the object to array of objects
*/
let newRedirects = [];
Object.keys(vercelRedirects).forEach((value) =>
newRedirects.push({
source: value,
destination: vercelRedirects[value].destination,
permanent: !!vercelRedirects[value].isPermanent,
})
);
/**
* We already have a vercel.json so we spread the new contents along with old ones
*/
const newContents = {
...oldConfigContent,
redirects: [...oldConfigContent.redirects, ...newRedirects],
};
writeFile(redirectsFilePath, JSON.stringify(newContents, null, 2));
}
// versions.yml structure is [{path: string, url: string, ...}, ...]
writeRedirectsFile(
versions
.filter((version) => version.path && version.url)
.map((version) => ({
fromPath: version.path,
toPath: version.url,
})),
redirectsFilePath
);