63 lines
2.2 KiB
TypeScript
63 lines
2.2 KiB
TypeScript
/*
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* SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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import nodePath from 'node:path';
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import nodeFs from 'node:fs';
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import { Injectable } from '@nestjs/common';
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import { bindThis } from '@/decorators.js';
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import { type ManagedMemoryKVCache, CacheManagementService } from '@/global/CacheManagementService.js';
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import { type EnvOption, createEnvOptions } from '@/env.js';
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/**
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* Provides structured, mockable access to runtime/environment details.
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*/
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@Injectable()
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export class EnvService {
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protected readonly dependencyVersionCache: ManagedMemoryKVCache<string | null>;
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protected readonly envOptions: EnvOption;
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constructor(cacheManagementService: CacheManagementService) {
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this.dependencyVersionCache = cacheManagementService.createMemoryKVCache<string | null>(Infinity);
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this.envOptions = createEnvOptions(() => this.env);
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}
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/**
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* Returns the environment variables of the process.
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* Modifications are reflected back to the local process, but not to the operating system environment.
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*/
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public get env(): Partial<Record<string, string>> {
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return process.env;
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}
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/**
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* Maps and returns environment-based options for the process.
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* Modifications are reflected back to the local process ("env" property), but not to the operating system environment.
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*/
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public get options(): EnvOption {
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return this.envOptions;
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}
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/**
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* Returns the installed version of a given dependency, or null if not installed.
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*/
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@bindThis
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public async getDependencyVersion(dependency: string): Promise<string | null> {
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return await this.dependencyVersionCache.fetch(dependency, async () => {
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const packageJsonPath = nodePath.join(import.meta.dirname, '../../package.json');
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const packageJsonText = nodeFs.readFileSync(packageJsonPath, 'utf8');
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// No "dependencies" section -> infer not installed.
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const packageJson = JSON.parse(packageJsonText) as { dependencies?: Partial<Record<string, string>> };
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if (packageJson.dependencies == null) return null;
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// Not listed -> not installed.
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const version = packageJson.dependencies['mfm-js'];
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if (version == null) return null;
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// Just in case some other value is there
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return String(version);
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});
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}
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}
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