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#!/usr/bin/env node

// Ref 1: https://github.com/sanathkr/go-npm

// Ref 2: https://blog.xendit.engineer/how-we-repurposed-npm-to-publish-and-distribute-our-go-binaries-for-internal-cli-23981b80911b

"use strict";

import binLinks from "bin-links";

import { createHash } from "crypto";

import fs from "fs";

import fetch from "node-fetch";

import { Agent } from "https";

import { HttpsProxyAgent } from "https-proxy-agent";

import path from "path";

import { extract } from "tar";

import zlib from "zlib";

// Mapping from Node's `process.arch` to Golang's `$GOARCH`

const ARCH_MAPPING = {

x64: "amd64",

arm64: "arm64",

};

// Mapping between Node's `process.platform` to Golang's

const PLATFORM_MAPPING = {

darwin: "darwin",

linux: "linux",

win32: "windows",

};

const arch = ARCH_MAPPING[process.arch];

const platform = PLATFORM_MAPPING[process.platform];

// TODO: import pkg from "../package.json" assert { type: "json" };

const readPackageJson = async () => {

const contents = await fs.promises.readFile("package.json");

return JSON.parse(contents);

};

// Build the download url from package.json

const getDownloadUrl = (packageJson) => {

const pkgName = packageJson.name;

const version = packageJson.version;

const repo = packageJson.repository;

const url = `https://github.com/${repo}/releases/download/v${version}/${pkgName}_${platform}_${arch}.tar.gz`;

return url;

};

const fetchAndParseCheckSumFile = async (packageJson, agent) => {

const version = packageJson.version;

const pkgName = packageJson.name;

const repo = packageJson.repository;

const checksumFileUrl = `https://github.com/${repo}/releases/download/v${version}/${pkgName}_${version}_checksums.txt`;

// Fetch the checksum file

console.info("Downloading", checksumFileUrl);

const response = await fetch(checksumFileUrl, { agent });

if (response.ok) {

const checkSumContent = await response.text();

const lines = checkSumContent.split("\n");

const checksums = {};

for (const line of lines) {

const [checksum, packageName] = line.split(/\s+/);

checksums[packageName] = checksum;

}

return checksums;

} else {

console.error(

"Could not fetch checksum file",

response.status,

response.statusText

);

}

};

const errGlobal = `Installing Supabase CLI as a global module is not supported.

Please use one of the supported package managers: https://github.com/supabase/cli#install-the-cli

`;

const errChecksum = "Checksum mismatch. Downloaded data might be corrupted.";

const errUnsupported = `Installation is not supported for ${process.platform} ${process.arch}`;

/**

* Reads the configuration from application's package.json,

* downloads the binary from package url and stores at

* ./bin in the package's root.

*

* See: https://docs.npmjs.com/files/package.json#bin

*/

async function main() {

const yarnGlobal = JSON.parse(

process.env.npm_config_argv || "{}"

).original?.includes("global");

if (process.env.npm_config_global || yarnGlobal) {

throw errGlobal;

}

if (!arch || !platform) {

throw errUnsupported;

}

const pkg = await readPackageJson();

if (platform === "windows") {

// Update bin path in package.json

pkg.bin[pkg.name] += ".exe";

}

const binPath = pkg.bin[pkg.name];

const binDir = path.dirname(binPath);

await fs.promises.mkdir(binDir, { recursive: true });

// First we will Un-GZip, then we will untar.

const ungz = zlib.createGunzip();

const binName = path.basename(binPath);

const untar = extract({ cwd: binDir }, [binName]);

const url = getDownloadUrl(pkg);

console.info("Downloading", url);

const proxyUrl =

process.env.npm_config_https_proxy ||

process.env.npm_config_http_proxy ||

process.env.npm_config_proxy;

// Keeps the TCP connection alive when sending multiple requests

// Ref: https://github.com/node-fetch/node-fetch/issues/1735

const agent = proxyUrl

? new HttpsProxyAgent(proxyUrl, { keepAlive: true })

: new Agent({ keepAlive: true });

const resp = await fetch(url, { agent });

const hash = createHash("sha256");

const pkgNameWithPlatform = `${pkg.name}_${platform}_${arch}.tar.gz`;

const checksumMap = await fetchAndParseCheckSumFile(pkg, agent);

resp.body

.on("data", (chunk) => {

hash.update(chunk);

})

.pipe(ungz);

ungz

.on("end", () => {

const expectedChecksum = checksumMap?.[pkgNameWithPlatform];

// Skip verification if we can't find the file checksum

if (!expectedChecksum) {

console.warn("Skipping checksum verification");

return;

}

const calculatedChecksum = hash.digest("hex");

if (calculatedChecksum !== expectedChecksum) {

throw errChecksum;

}

console.info("Checksum verified.");

})

.pipe(untar);

await new Promise((resolve, reject) => {

untar.on("error", reject);

untar.on("end", () => resolve());

});

// Link the binaries in postinstall to support yarn

await binLinks({

path: path.resolve("."),

pkg: { ...pkg, bin: { [pkg.name]: binPath } },

});

console.info("Installed Supabase CLI successfully");

}

await main();