expo-signed/index.js

Effortlessly configure signing for Android builds in Expo projects during the prebuild process.

/* eslint-env node */

const { withGradleProperties } = require('@expo/config-plugins');
const fs = require('fs');
const path = require('path');

const app_path = './android/app';

const modifyGradleProperties = (config, props) => {
	return withGradleProperties(config, (config) => {
		Object.entries(props).forEach(([prop, { key, value }]) => {
			if (key && value) {
				const exists = config.modResults.find(
					(item) => item.type === 'property' && item.key === key
				);
				if (!exists) {
					config.modResults.push({ key, type: 'property', value });
				}
			}
		});

		return config;
	});
};

const modifyBuildGradle = (config, props) => {
	const filePath = path.resolve(app_path, 'build.gradle');

	if (fs.existsSync(filePath)) {
		const content = fs.readFileSync(filePath, 'utf8');
		const release = /signingConfigs\s*\{(?:[^{}]*\{[^}]*\}|[^}])*release\s*\{[^}]*\}[^}]*\}/;

		let updatedContent = content.replace(
			/(release\s*{[^}]*signingConfig\s+signingConfigs\.)debug/,
			'$1release'
		);

		if (!release.test(updatedContent)) {
			updatedContent = updatedContent.replace(
				/(signingConfigs\s*{[^}]*debug\s*{[^}]*})/,
				`$1
		release {
			if (project.hasProperty('${props.store_file.key}')) {
				storeFile file(${props.store_file.key})
				storePassword ${props.store_password.key}
				keyAlias ${props.key_alias.key}
				keyPassword ${props.key_password.key}
			}
		}`
			);
		}

		if (updatedContent !== content) {
			fs.writeFileSync(filePath, updatedContent, 'utf8');
		}
	}

	return config;
};

const copyKeystoreFile = (config, props) => {
	const source = path.resolve(props.keystorePath, props.store_file.value);
	const destination = path.resolve(app_path, props.store_file.value);

	if (fs.existsSync(source) && fs.existsSync(path.dirname(destination))) {
		fs.copyFileSync(source, destination);
	}

	return config;
};

const withSigned = (config, props) => {
	const requiredProps = [
		'store_file',
		'key_alias',
		'store_password',
		'key_password',
		'keystorePath',
	];

	requiredProps.forEach((prop) => {
		if (!props[prop]) {
			throw new Error(`Missing required property: ${prop}`);
		}
	});

	return copyKeystoreFile(modifyBuildGradle(modifyGradleProperties(config, props), props), props);
};

module.exports = withSigned;