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'use strict' const BB = require('bluebird') const fetch = require('npm-registry-fetch') const LRU = require('lru-cache') const optCheck = require('../../util/opt-check') // Corgis are cute. 🐕🐶 const CORGI_DOC = 'application/vnd.npm.install-v1+json; q=1.0, application/json; q=0.8, */*' const JSON_DOC = 'application/json' module.exports = packument function packument (spec, opts) { opts = optCheck(opts) const registry = fetch.pickRegistry(spec, opts) const uri = registry.replace(/\/?$/, '/') + spec.escapedName return fetchPackument(uri, registry, spec, opts) } const MEMO = new LRU({ length: m => m._contentLength, max: 200 * 1024 * 1024, // 200MB maxAge: 30 * 1000 // 30s }) module.exports.clearMemoized = clearMemoized function clearMemoized () { MEMO.reset() } function fetchPackument (uri, registry, spec, opts) { const mem = pickMem(opts) const accept = opts.fullMetadata ? JSON_DOC : CORGI_DOC const memoKey = `${uri}~(${accept})` if (mem && !opts.preferOnline && mem.has(memoKey)) { return BB.resolve(mem.get(memoKey)) } return fetch(uri, opts.concat({ headers: { 'pacote-req-type': 'packument', 'pacote-pkg-id': `registry:${spec.name}`, accept }, spec }, opts, { // Force integrity to null: we never check integrity hashes for manifests integrity: null })).then(res => res.json().then(packument => { packument._cached = res.headers.has('x-local-cache') packument._contentLength = +res.headers.get('content-length') // NOTE - we need to call pickMem again because proxy // objects get reused! const mem = pickMem(opts) if (mem) { mem.set(memoKey, packument) } return packument })).catch(err => { if (err.code === 'E404' && !opts.fullMetadata) { return fetchPackument(uri, registry, spec, opts.concat({ fullMetadata: true })) } else { throw err } }) } class ObjProxy { get (key) { return this.obj[key] } set (key, val) { this.obj[key] = val } } // This object is used synchronously and immediately, so // we can safely reuse it instead of consing up new ones const PROX = new ObjProxy() function pickMem (opts) { if (!opts || !opts.memoize) { return MEMO } else if (opts.memoize.get && opts.memoize.set) { return opts.memoize } else if (typeof opts.memoize === 'object') { PROX.obj = opts.memoize return PROX } else { return null } }
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