push the uni-demo project

uni-demo/node_modules/make-fetch-happen/lib/agent.js

@@ -0,0 +1,194 @@
+'use strict'
+const LRU = require('lru-cache')
+const url = require('url')
+const isLambda = require('is-lambda')
+
+const AGENT_CACHE = new LRU({ max: 50 })
+const HttpAgent = require('agentkeepalive')
+const HttpsAgent = HttpAgent.HttpsAgent
+
+module.exports = getAgent
+
+const getAgentTimeout = timeout =>
+  typeof timeout !== 'number' || !timeout ? 0 : timeout + 1
+
+const getMaxSockets = maxSockets => maxSockets || 15
+
+function getAgent (uri, opts) {
+  const parsedUri = new url.URL(typeof uri === 'string' ? uri : uri.url)
+  const isHttps = parsedUri.protocol === 'https:'
+  const pxuri = getProxyUri(parsedUri.href, opts)
+
+  // If opts.timeout is zero, set the agentTimeout to zero as well. A timeout
+  // of zero disables the timeout behavior (OS limits still apply). Else, if
+  // opts.timeout is a non-zero value, set it to timeout + 1, to ensure that
+  // the node-fetch-npm timeout will always fire first, giving us more
+  // consistent errors.
+  const agentTimeout = getAgentTimeout(opts.timeout)
+  const agentMaxSockets = getMaxSockets(opts.maxSockets)
+
+  const key = [
+    `https:${isHttps}`,
+    pxuri
+      ? `proxy:${pxuri.protocol}//${pxuri.host}:${pxuri.port}`
+      : '>no-proxy<',
+    `local-address:${opts.localAddress || '>no-local-address<'}`,
+    `strict-ssl:${isHttps ? opts.rejectUnauthorized : '>no-strict-ssl<'}`,
+    `ca:${(isHttps && opts.ca) || '>no-ca<'}`,
+    `cert:${(isHttps && opts.cert) || '>no-cert<'}`,
+    `key:${(isHttps && opts.key) || '>no-key<'}`,
+    `timeout:${agentTimeout}`,
+    `maxSockets:${agentMaxSockets}`,
+  ].join(':')
+
+  if (opts.agent != null) { // `agent: false` has special behavior!
+    return opts.agent
+  }
+
+  // keep alive in AWS lambda makes no sense
+  const lambdaAgent = !isLambda ? null
+    : isHttps ? require('https').globalAgent
+    : require('http').globalAgent
+
+  if (isLambda && !pxuri)
+    return lambdaAgent
+
+  if (AGENT_CACHE.peek(key))
+    return AGENT_CACHE.get(key)
+
+  if (pxuri) {
+    const pxopts = isLambda ? {
+      ...opts,
+      agent: lambdaAgent,
+    } : opts
+    const proxy = getProxy(pxuri, pxopts, isHttps)
+    AGENT_CACHE.set(key, proxy)
+    return proxy
+  }
+
+  const agent = isHttps ? new HttpsAgent({
+    maxSockets: agentMaxSockets,
+    ca: opts.ca,
+    cert: opts.cert,
+    key: opts.key,
+    localAddress: opts.localAddress,
+    rejectUnauthorized: opts.rejectUnauthorized,
+    timeout: agentTimeout,
+  }) : new HttpAgent({
+    maxSockets: agentMaxSockets,
+    localAddress: opts.localAddress,
+    timeout: agentTimeout,
+  })
+  AGENT_CACHE.set(key, agent)
+  return agent
+}
+
+function checkNoProxy (uri, opts) {
+  const host = new url.URL(uri).hostname.split('.').reverse()
+  let noproxy = (opts.noProxy || getProcessEnv('no_proxy'))
+  if (typeof noproxy === 'string')
+    noproxy = noproxy.split(/\s*,\s*/g)
+
+  return noproxy && noproxy.some(no => {
+    const noParts = no.split('.').filter(x => x).reverse()
+    if (!noParts.length)
+      return false
+    for (let i = 0; i < noParts.length; i++) {
+      if (host[i] !== noParts[i])
+        return false
+    }
+    return true
+  })
+}
+
+module.exports.getProcessEnv = getProcessEnv
+
+function getProcessEnv (env) {
+  if (!env)
+    return
+
+  let value
+
+  if (Array.isArray(env)) {
+    for (const e of env) {
+      value = process.env[e] ||
+        process.env[e.toUpperCase()] ||
+        process.env[e.toLowerCase()]
+      if (typeof value !== 'undefined')
+        break
+    }
+  }
+
+  if (typeof env === 'string') {
+    value = process.env[env] ||
+      process.env[env.toUpperCase()] ||
+      process.env[env.toLowerCase()]
+  }
+
+  return value
+}
+
+module.exports.getProxyUri = getProxyUri
+function getProxyUri (uri, opts) {
+  const protocol = new url.URL(uri).protocol
+
+  const proxy = opts.proxy ||
+    (
+      protocol === 'https:' &&
+      getProcessEnv('https_proxy')
+    ) ||
+    (
+      protocol === 'http:' &&
+      getProcessEnv(['https_proxy', 'http_proxy', 'proxy'])
+    )
+  if (!proxy)
+    return null
+
+  const parsedProxy = (typeof proxy === 'string') ? new url.URL(proxy) : proxy
+
+  return !checkNoProxy(uri, opts) && parsedProxy
+}
+
+const getAuth = u =>
+  u.username && u.password ? decodeURIComponent(`${u.username}:${u.password}`)
+  : u.username ? decodeURIComponent(u.username)
+  : null
+
+const getPath = u => u.pathname + u.search + u.hash
+
+const HttpProxyAgent = require('http-proxy-agent')
+const HttpsProxyAgent = require('https-proxy-agent')
+const SocksProxyAgent = require('socks-proxy-agent')
+module.exports.getProxy = getProxy
+function getProxy (proxyUrl, opts, isHttps) {
+  const popts = {
+    host: proxyUrl.hostname,
+    port: proxyUrl.port,
+    protocol: proxyUrl.protocol,
+    path: getPath(proxyUrl),
+    auth: getAuth(proxyUrl),
+    ca: opts.ca,
+    cert: opts.cert,
+    key: opts.key,
+    timeout: getAgentTimeout(opts.timeout),
+    localAddress: opts.localAddress,
+    maxSockets: getMaxSockets(opts.maxSockets),
+    rejectUnauthorized: opts.rejectUnauthorized,
+  }
+
+  if (proxyUrl.protocol === 'http:' || proxyUrl.protocol === 'https:') {
+    if (!isHttps)
+      return new HttpProxyAgent(popts)
+    else
+      return new HttpsProxyAgent(popts)
+  } else if (proxyUrl.protocol.startsWith('socks'))
+    return new SocksProxyAgent(popts)
+  else {
+    throw Object.assign(
+      new Error(`unsupported proxy protocol: '${proxyUrl.protocol}'`),
+      {
+        url: proxyUrl.href,
+      }
+    )
+  }
+}

uni-demo/node_modules/make-fetch-happen/lib/cache/entry.js

@@ -0,0 +1,460 @@
+const { Request, Response } = require('minipass-fetch')
+const Minipass = require('minipass')
+const MinipassCollect = require('minipass-collect')
+const MinipassFlush = require('minipass-flush')
+const MinipassPipeline = require('minipass-pipeline')
+const cacache = require('cacache')
+const url = require('url')
+
+const CachePolicy = require('./policy.js')
+const cacheKey = require('./key.js')
+const remote = require('../remote.js')
+
+const hasOwnProperty = (obj, prop) => Object.prototype.hasOwnProperty.call(obj, prop)
+
+// maximum amount of data we will buffer into memory
+// if we'll exceed this, we switch to streaming
+const MAX_MEM_SIZE = 5 * 1024 * 1024 // 5MB
+
+// allow list for request headers that will be written to the cache index
+// note: we will also store any request headers
+// that are named in a response's vary header
+const KEEP_REQUEST_HEADERS = [
+  'accept-charset',
+  'accept-encoding',
+  'accept-language',
+  'accept',
+  'cache-control',
+]
+
+// allow list for response headers that will be written to the cache index
+// note: we must not store the real response's age header, or when we load
+// a cache policy based on the metadata it will think the cached response
+// is always stale
+const KEEP_RESPONSE_HEADERS = [
+  'cache-control',
+  'content-encoding',
+  'content-language',
+  'content-type',
+  'date',
+  'etag',
+  'expires',
+  'last-modified',
+  'location',
+  'pragma',
+  'vary',
+]
+
+// return an object containing all metadata to be written to the index
+const getMetadata = (request, response, options) => {
+  const metadata = {
+    time: Date.now(),
+    url: request.url,
+    reqHeaders: {},
+    resHeaders: {},
+  }
+
+  // only save the status if it's not a 200 or 304
+  if (response.status !== 200 && response.status !== 304)
+    metadata.status = response.status
+
+  for (const name of KEEP_REQUEST_HEADERS) {
+    if (request.headers.has(name))
+      metadata.reqHeaders[name] = request.headers.get(name)
+  }
+
+  // if the request's host header differs from the host in the url
+  // we need to keep it, otherwise it's just noise and we ignore it
+  const host = request.headers.get('host')
+  const parsedUrl = new url.URL(request.url)
+  if (host && parsedUrl.host !== host)
+    metadata.reqHeaders.host = host
+
+  // if the response has a vary header, make sure
+  // we store the relevant request headers too
+  if (response.headers.has('vary')) {
+    const vary = response.headers.get('vary')
+    // a vary of "*" means every header causes a different response.
+    // in that scenario, we do not include any additional headers
+    // as the freshness check will always fail anyway and we don't
+    // want to bloat the cache indexes
+    if (vary !== '*') {
+      // copy any other request headers that will vary the response
+      const varyHeaders = vary.trim().toLowerCase().split(/\s*,\s*/)
+      for (const name of varyHeaders) {
+        // explicitly ignore accept-encoding here
+        if (name !== 'accept-encoding' && request.headers.has(name))
+          metadata.reqHeaders[name] = request.headers.get(name)
+      }
+    }
+  }
+
+  for (const name of KEEP_RESPONSE_HEADERS) {
+    if (response.headers.has(name))
+      metadata.resHeaders[name] = response.headers.get(name)
+  }
+
+  // we only store accept-encoding and content-encoding if the user
+  // has disabled automatic compression and decompression in minipass-fetch
+  // since if it's enabled (the default) then the content will have
+  // already been decompressed making the header a lie
+  if (options.compress === false) {
+    metadata.reqHeaders['accept-encoding'] = request.headers.get('accept-encoding')
+    metadata.resHeaders['content-encoding'] = response.headers.get('content-encoding')
+  }
+
+  return metadata
+}
+
+// symbols used to hide objects that may be lazily evaluated in a getter
+const _request = Symbol('request')
+const _response = Symbol('response')
+const _policy = Symbol('policy')
+
+class CacheEntry {
+  constructor ({ entry, request, response, options }) {
+    if (entry) {
+      this.key = entry.key
+      this.entry = entry
+      // previous versions of this module didn't write an explicit timestamp in
+      // the metadata, so fall back to the entry's timestamp. we can't use the
+      // entry timestamp to determine staleness because cacache will update it
+      // when it verifies its data
+      this.entry.metadata.time = this.entry.metadata.time || this.entry.time
+    } else
+      this.key = cacheKey(request)
+
+    this.options = options
+
+    // these properties are behind getters that lazily evaluate
+    this[_request] = request
+    this[_response] = response
+    this[_policy] = null
+  }
+
+  // returns a CacheEntry instance that satisfies the given request
+  // or undefined if no existing entry satisfies
+  static async find (request, options) {
+    try {
+      // compacts the index and returns an array of unique entries
+      var matches = await cacache.index.compact(options.cachePath, cacheKey(request), (A, B) => {
+        const entryA = new CacheEntry({ entry: A, options })
+        const entryB = new CacheEntry({ entry: B, options })
+        return entryA.policy.satisfies(entryB.request)
+      }, {
+        validateEntry: (entry) => {
+          // if an integrity is null, it needs to have a status specified
+          if (entry.integrity === null)
+            return !!(entry.metadata && entry.metadata.status)
+
+          return true
+        },
+      })
+    } catch (err) {
+      // if the compact request fails, ignore the error and return
+      return
+    }
+
+    // a cache mode of 'reload' means to behave as though we have no cache
+    // on the way to the network. return undefined to allow cacheFetch to
+    // create a brand new request no matter what.
+    if (options.cache === 'reload')
+      return
+
+    // find the specific entry that satisfies the request
+    let match
+    for (const entry of matches) {
+      const _entry = new CacheEntry({
+        entry,
+        options,
+      })
+
+      if (_entry.policy.satisfies(request)) {
+        match = _entry
+        break
+      }
+    }
+
+    return match
+  }
+
+  // if the user made a PUT/POST/PATCH then we invalidate our
+  // cache for the same url by deleting the index entirely
+  static async invalidate (request, options) {
+    const key = cacheKey(request)
+    try {
+      await cacache.rm.entry(options.cachePath, key, { removeFully: true })
+    } catch (err) {
+      // ignore errors
+    }
+  }
+
+  get request () {
+    if (!this[_request]) {
+      this[_request] = new Request(this.entry.metadata.url, {
+        method: 'GET',
+        headers: this.entry.metadata.reqHeaders,
+      })
+    }
+
+    return this[_request]
+  }
+
+  get response () {
+    if (!this[_response]) {
+      this[_response] = new Response(null, {
+        url: this.entry.metadata.url,
+        counter: this.options.counter,
+        status: this.entry.metadata.status || 200,
+        headers: {
+          ...this.entry.metadata.resHeaders,
+          'content-length': this.entry.size,
+        },
+      })
+    }
+
+    return this[_response]
+  }
+
+  get policy () {
+    if (!this[_policy]) {
+      this[_policy] = new CachePolicy({
+        entry: this.entry,
+        request: this.request,
+        response: this.response,
+        options: this.options,
+      })
+    }
+
+    return this[_policy]
+  }
+
+  // wraps the response in a pipeline that stores the data
+  // in the cache while the user consumes it
+  async store (status) {
+    // if we got a status other than 200, 301, or 308,
+    // or the CachePolicy forbid storage, append the
+    // cache status header and return it untouched
+    if (this.request.method !== 'GET' || ![200, 301, 308].includes(this.response.status) || !this.policy.storable()) {
+      this.response.headers.set('x-local-cache-status', 'skip')
+      return this.response
+    }
+
+    const size = this.response.headers.get('content-length')
+    const fitsInMemory = !!size && Number(size) < MAX_MEM_SIZE
+    const shouldBuffer = this.options.memoize !== false && fitsInMemory
+    const cacheOpts = {
+      algorithms: this.options.algorithms,
+      metadata: getMetadata(this.request, this.response, this.options),
+      size,
+      memoize: fitsInMemory && this.options.memoize,
+    }
+
+    let body = null
+    // we only set a body if the status is a 200, redirects are
+    // stored as metadata only
+    if (this.response.status === 200) {
+      let cacheWriteResolve, cacheWriteReject
+      const cacheWritePromise = new Promise((resolve, reject) => {
+        cacheWriteResolve = resolve
+        cacheWriteReject = reject
+      })
+
+      body = new MinipassPipeline(new MinipassFlush({
+        flush () {
+          return cacheWritePromise
+        },
+      }))
+
+      let abortStream, onResume
+      if (shouldBuffer) {
+        // if the result fits in memory, use a collect stream to gather
+        // the response and write it to cacache while also passing it through
+        // to the user
+        onResume = () => {
+          const collector = new MinipassCollect.PassThrough()
+          abortStream = collector
+          collector.on('collect', (data) => {
+            // TODO if the cache write fails, log a warning but return the response anyway
+            cacache.put(this.options.cachePath, this.key, data, cacheOpts).then(cacheWriteResolve, cacheWriteReject)
+          })
+          body.unshift(collector)
+          body.unshift(this.response.body)
+        }
+      } else {
+        // if it does not fit in memory, create a tee stream and use
+        // that to pipe to both the cache and the user simultaneously
+        onResume = () => {
+          const tee = new Minipass()
+          const cacheStream = cacache.put.stream(this.options.cachePath, this.key, cacheOpts)
+          abortStream = cacheStream
+          tee.pipe(cacheStream)
+          // TODO if the cache write fails, log a warning but return the response anyway
+          cacheStream.promise().then(cacheWriteResolve, cacheWriteReject)
+          body.unshift(tee)
+          body.unshift(this.response.body)
+        }
+      }
+
+      body.once('resume', onResume)
+      body.once('end', () => body.removeListener('resume', onResume))
+      this.response.body.on('error', (err) => {
+        // the abortStream will either be a MinipassCollect if we buffer
+        // or a cacache write stream, either way be sure to listen for
+        // errors from the actual response and avoid writing data that we
+        // know to be invalid to the cache
+        abortStream.destroy(err)
+      })
+    } else
+      await cacache.index.insert(this.options.cachePath, this.key, null, cacheOpts)
+
+    // note: we do not set the x-local-cache-hash header because we do not know
+    // the hash value until after the write to the cache completes, which doesn't
+    // happen until after the response has been sent and it's too late to write
+    // the header anyway
+    this.response.headers.set('x-local-cache', encodeURIComponent(this.options.cachePath))
+    this.response.headers.set('x-local-cache-key', encodeURIComponent(this.key))
+    this.response.headers.set('x-local-cache-mode', shouldBuffer ? 'buffer' : 'stream')
+    this.response.headers.set('x-local-cache-status', status)
+    this.response.headers.set('x-local-cache-time', new Date().toISOString())
+    const newResponse = new Response(body, {
+      url: this.response.url,
+      status: this.response.status,
+      headers: this.response.headers,
+      counter: this.options.counter,
+    })
+    return newResponse
+  }
+
+  // use the cached data to create a response and return it
+  async respond (method, options, status) {
+    let response
+    const size = Number(this.response.headers.get('content-length'))
+    const fitsInMemory = !!size && size < MAX_MEM_SIZE
+    const shouldBuffer = this.options.memoize !== false && fitsInMemory
+    if (method === 'HEAD' || [301, 308].includes(this.response.status)) {
+      // if the request is a HEAD, or the response is a redirect,
+      // then the metadata in the entry already includes everything
+      // we need to build a response
+      response = this.response
+    } else {
+      // we're responding with a full cached response, so create a body
+      // that reads from cacache and attach it to a new Response
+      const body = new Minipass()
+      const removeOnResume = () => body.removeListener('resume', onResume)
+      let onResume
+      if (shouldBuffer) {
+        onResume = async () => {
+          removeOnResume()
+          try {
+            const content = await cacache.get.byDigest(this.options.cachePath, this.entry.integrity, { memoize: this.options.memoize })
+            body.end(content)
+          } catch (err) {
+            if (err.code === 'EINTEGRITY')
+              await cacache.rm.content(this.options.cachePath, this.entry.integrity, { memoize: this.options.memoize })
+            if (err.code === 'ENOENT' || err.code === 'EINTEGRITY')
+              await CacheEntry.invalidate(this.request, this.options)
+            body.emit('error', err)
+          }
+        }
+      } else {
+        onResume = () => {
+          const cacheStream = cacache.get.stream.byDigest(this.options.cachePath, this.entry.integrity, { memoize: this.options.memoize })
+          cacheStream.on('error', async (err) => {
+            cacheStream.pause()
+            if (err.code === 'EINTEGRITY')
+              await cacache.rm.content(this.options.cachePath, this.entry.integrity, { memoize: this.options.memoize })
+            if (err.code === 'ENOENT' || err.code === 'EINTEGRITY')
+              await CacheEntry.invalidate(this.request, this.options)
+            body.emit('error', err)
+            cacheStream.resume()
+          })
+          cacheStream.pipe(body)
+        }
+      }
+
+      body.once('resume', onResume)
+      body.once('end', removeOnResume)
+      response = new Response(body, {
+        url: this.entry.metadata.url,
+        counter: options.counter,
+        status: 200,
+        headers: {
+          ...this.policy.responseHeaders(),
+        },
+      })
+    }
+
+    response.headers.set('x-local-cache', encodeURIComponent(this.options.cachePath))
+    response.headers.set('x-local-cache-hash', encodeURIComponent(this.entry.integrity))
+    response.headers.set('x-local-cache-key', encodeURIComponent(this.key))
+    response.headers.set('x-local-cache-mode', shouldBuffer ? 'buffer' : 'stream')
+    response.headers.set('x-local-cache-status', status)
+    response.headers.set('x-local-cache-time', new Date(this.entry.metadata.time).toUTCString())
+    return response
+  }
+
+  // use the provided request along with this cache entry to
+  // revalidate the stored response. returns a response, either
+  // from the cache or from the update
+  async revalidate (request, options) {
+    const revalidateRequest = new Request(request, {
+      headers: this.policy.revalidationHeaders(request),
+    })
+
+    try {
+      // NOTE: be sure to remove the headers property from the
+      // user supplied options, since we have already defined
+      // them on the new request object. if they're still in the
+      // options then those will overwrite the ones from the policy
+      var response = await remote(revalidateRequest, {
+        ...options,
+        headers: undefined,
+      })
+    } catch (err) {
+      // if the network fetch fails, return the stale
+      // cached response unless it has a cache-control
+      // of 'must-revalidate'
+      if (!this.policy.mustRevalidate)
+        return this.respond(request.method, options, 'stale')
+
+      throw err
+    }
+
+    if (this.policy.revalidated(revalidateRequest, response)) {
+      // we got a 304, write a new index to the cache and respond from cache
+      const metadata = getMetadata(request, response, options)
+      // 304 responses do not include headers that are specific to the response data
+      // since they do not include a body, so we copy values for headers that were
+      // in the old cache entry to the new one, if the new metadata does not already
+      // include that header
+      for (const name of KEEP_RESPONSE_HEADERS) {
+        if (!hasOwnProperty(metadata.resHeaders, name) && hasOwnProperty(this.entry.metadata.resHeaders, name))
+          metadata.resHeaders[name] = this.entry.metadata.resHeaders[name]
+      }
+
+      try {
+        await cacache.index.insert(options.cachePath, this.key, this.entry.integrity, {
+          size: this.entry.size,
+          metadata,
+        })
+      } catch (err) {
+        // if updating the cache index fails, we ignore it and
+        // respond anyway
+      }
+      return this.respond(request.method, options, 'revalidated')
+    }
+
+    // if we got a modified response, create a new entry based on it
+    const newEntry = new CacheEntry({
+      request,
+      response,
+      options,
+    })
+
+    // respond with the new entry while writing it to the cache
+    return newEntry.store('updated')
+  }
+}
+
+module.exports = CacheEntry

uni-demo/node_modules/make-fetch-happen/lib/cache/errors.js

@@ -0,0 +1,10 @@
+class NotCachedError extends Error {
+  constructor (url) {
+    super(`request to ${url} failed: cache mode is 'only-if-cached' but no cached response is available.`)
+    this.code = 'ENOTCACHED'
+  }
+}
+
+module.exports = {
+  NotCachedError,
+}

uni-demo/node_modules/make-fetch-happen/lib/cache/index.js

@@ -0,0 +1,45 @@
+const { NotCachedError } = require('./errors.js')
+const CacheEntry = require('./entry.js')
+const remote = require('../remote.js')
+
+// do whatever is necessary to get a Response and return it
+const cacheFetch = async (request, options) => {
+  // try to find a cached entry that satisfies this request
+  const entry = await CacheEntry.find(request, options)
+  if (!entry) {
+    // no cached result, if the cache mode is 'only-if-cached' that's a failure
+    if (options.cache === 'only-if-cached')
+      throw new NotCachedError(request.url)
+
+    // otherwise, we make a request, store it and return it
+    const response = await remote(request, options)
+    const entry = new CacheEntry({ request, response, options })
+    return entry.store('miss')
+  }
+
+  // we have a cached response that satisfies this request, however if the cache
+  // mode is 'no-cache' then we send the revalidation request no matter what
+  if (options.cache === 'no-cache')
+    return entry.revalidate(request, options)
+
+  // if the cached entry is not stale, or if the cache mode is 'force-cache' or
+  // 'only-if-cached' we can respond with the cached entry. set the status
+  // based on the result of needsRevalidation and respond
+  const _needsRevalidation = entry.policy.needsRevalidation(request)
+  if (options.cache === 'force-cache' ||
+      options.cache === 'only-if-cached' ||
+      !_needsRevalidation)
+    return entry.respond(request.method, options, _needsRevalidation ? 'stale' : 'hit')
+
+  // if we got here, the cache entry is stale so revalidate it
+  return entry.revalidate(request, options)
+}
+
+cacheFetch.invalidate = async (request, options) => {
+  if (!options.cachePath)
+    return
+
+  return CacheEntry.invalidate(request, options)
+}
+
+module.exports = cacheFetch

uni-demo/node_modules/make-fetch-happen/lib/cache/key.js

@@ -0,0 +1,17 @@
+const { URL, format } = require('url')
+
+// options passed to url.format() when generating a key
+const formatOptions = {
+  auth: false,
+  fragment: false,
+  search: true,
+  unicode: false,
+}
+
+// returns a string to be used as the cache key for the Request
+const cacheKey = (request) => {
+  const parsed = new URL(request.url)
+  return `make-fetch-happen:request-cache:${format(parsed, formatOptions)}`
+}
+
+module.exports = cacheKey

uni-demo/node_modules/make-fetch-happen/lib/cache/policy.js

@@ -0,0 +1,161 @@
+const CacheSemantics = require('http-cache-semantics')
+const Negotiator = require('negotiator')
+const ssri = require('ssri')
+
+// HACK: negotiator lazy loads several of its own modules
+// as a micro optimization. we need to be sure that they're
+// in memory as soon as possible at startup so that we do
+// not try to lazy load them after the directory has been
+// retired during a self update of the npm CLI, we do this
+// by calling all of the methods that trigger a lazy load
+// on a fake instance.
+const preloadNegotiator = new Negotiator({ headers: {} })
+preloadNegotiator.charsets()
+preloadNegotiator.encodings()
+preloadNegotiator.languages()
+preloadNegotiator.mediaTypes()
+
+// options passed to http-cache-semantics constructor
+const policyOptions = {
+  shared: false,
+  ignoreCargoCult: true,
+}
+
+// a fake empty response, used when only testing the
+// request for storability
+const emptyResponse = { status: 200, headers: {} }
+
+// returns a plain object representation of the Request
+const requestObject = (request) => {
+  const _obj = {
+    method: request.method,
+    url: request.url,
+    headers: {},
+  }
+
+  request.headers.forEach((value, key) => {
+    _obj.headers[key] = value
+  })
+
+  return _obj
+}
+
+// returns a plain object representation of the Response
+const responseObject = (response) => {
+  const _obj = {
+    status: response.status,
+    headers: {},
+  }
+
+  response.headers.forEach((value, key) => {
+    _obj.headers[key] = value
+  })
+
+  return _obj
+}
+
+class CachePolicy {
+  constructor ({ entry, request, response, options }) {
+    this.entry = entry
+    this.request = requestObject(request)
+    this.response = responseObject(response)
+    this.options = options
+    this.policy = new CacheSemantics(this.request, this.response, policyOptions)
+
+    if (this.entry) {
+      // if we have an entry, copy the timestamp to the _responseTime
+      // this is necessary because the CacheSemantics constructor forces
+      // the value to Date.now() which means a policy created from a
+      // cache entry is likely to always identify itself as stale
+      this.policy._responseTime = this.entry.metadata.time
+    }
+  }
+
+  // static method to quickly determine if a request alone is storable
+  static storable (request, options) {
+    // no cachePath means no caching
+    if (!options.cachePath)
+      return false
+
+    // user explicitly asked not to cache
+    if (options.cache === 'no-store')
+      return false
+
+    // we only cache GET and HEAD requests
+    if (!['GET', 'HEAD'].includes(request.method))
+      return false
+
+    // otherwise, let http-cache-semantics make the decision
+    // based on the request's headers
+    const policy = new CacheSemantics(requestObject(request), emptyResponse, policyOptions)
+    return policy.storable()
+  }
+
+  // returns true if the policy satisfies the request
+  satisfies (request) {
+    const _req = requestObject(request)
+    if (this.request.headers.host !== _req.headers.host)
+      return false
+
+    const negotiatorA = new Negotiator(this.request)
+    const negotiatorB = new Negotiator(_req)
+
+    if (JSON.stringify(negotiatorA.mediaTypes()) !== JSON.stringify(negotiatorB.mediaTypes()))
+      return false
+
+    if (JSON.stringify(negotiatorA.languages()) !== JSON.stringify(negotiatorB.languages()))
+      return false
+
+    if (JSON.stringify(negotiatorA.encodings()) !== JSON.stringify(negotiatorB.encodings()))
+      return false
+
+    if (this.options.integrity)
+      return ssri.parse(this.options.integrity).match(this.entry.integrity)
+
+    return true
+  }
+
+  // returns true if the request and response allow caching
+  storable () {
+    return this.policy.storable()
+  }
+
+  // NOTE: this is a hack to avoid parsing the cache-control
+  // header ourselves, it returns true if the response's
+  // cache-control contains must-revalidate
+  get mustRevalidate () {
+    return !!this.policy._rescc['must-revalidate']
+  }
+
+  // returns true if the cached response requires revalidation
+  // for the given request
+  needsRevalidation (request) {
+    const _req = requestObject(request)
+    // force method to GET because we only cache GETs
+    // but can serve a HEAD from a cached GET
+    _req.method = 'GET'
+    return !this.policy.satisfiesWithoutRevalidation(_req)
+  }
+
+  responseHeaders () {
+    return this.policy.responseHeaders()
+  }
+
+  // returns a new object containing the appropriate headers
+  // to send a revalidation request
+  revalidationHeaders (request) {
+    const _req = requestObject(request)
+    return this.policy.revalidationHeaders(_req)
+  }
+
+  // returns true if the request/response was revalidated
+  // successfully. returns false if a new response was received
+  revalidated (request, response) {
+    const _req = requestObject(request)
+    const _res = responseObject(response)
+    const policy = this.policy.revalidatedPolicy(_req, _res)
+    return !policy.modified
+  }
+}
+
+module.exports = CachePolicy

uni-demo/node_modules/make-fetch-happen/lib/fetch.js

@@ -0,0 +1,100 @@
+'use strict'
+
+const { FetchError, Request, isRedirect } = require('minipass-fetch')
+const url = require('url')
+
+const CachePolicy = require('./cache/policy.js')
+const cache = require('./cache/index.js')
+const remote = require('./remote.js')
+
+// given a Request, a Response and user options
+// return true if the response is a redirect that
+// can be followed. we throw errors that will result
+// in the fetch being rejected if the redirect is
+// possible but invalid for some reason
+const canFollowRedirect = (request, response, options) => {
+  if (!isRedirect(response.status))
+    return false
+
+  if (options.redirect === 'manual')
+    return false
+
+  if (options.redirect === 'error')
+    throw new FetchError(`redirect mode is set to error: ${request.url}`, 'no-redirect', { code: 'ENOREDIRECT' })
+
+  if (!response.headers.has('location'))
+    throw new FetchError(`redirect location header missing for: ${request.url}`, 'no-location', { code: 'EINVALIDREDIRECT' })
+
+  if (request.counter >= request.follow)
+    throw new FetchError(`maximum redirect reached at: ${request.url}`, 'max-redirect', { code: 'EMAXREDIRECT' })
+
+  return true
+}
+
+// given a Request, a Response, and the user's options return an object
+// with a new Request and a new options object that will be used for
+// following the redirect
+const getRedirect = (request, response, options) => {
+  const _opts = { ...options }
+  const location = response.headers.get('location')
+  const redirectUrl = new url.URL(location, /^https?:/.test(location) ? undefined : request.url)
+  // Comment below is used under the following license:
+  // Copyright (c) 2010-2012 Mikeal Rogers
+  // Licensed under the Apache License, Version 2.0 (the "License");
+  // you may not use this file except in compliance with the License.
+  // You may obtain a copy of the License at
+  // http://www.apache.org/licenses/LICENSE-2.0
+  // Unless required by applicable law or agreed to in writing,
+  // software distributed under the License is distributed on an "AS
+  // IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+  // express or implied. See the License for the specific language
+  // governing permissions and limitations under the License.
+
+  // Remove authorization if changing hostnames (but not if just
+  // changing ports or protocols).  This matches the behavior of request:
+  // https://github.com/request/request/blob/b12a6245/lib/redirect.js#L134-L138
+  if (new url.URL(request.url).hostname !== redirectUrl.hostname)
+    request.headers.delete('authorization')
+
+  // for POST request with 301/302 response, or any request with 303 response,
+  // use GET when following redirect
+  if (response.status === 303 || (request.method === 'POST' && [301, 302].includes(response.status))) {
+    _opts.method = 'GET'
+    _opts.body = null
+    request.headers.delete('content-length')
+  }
+
+  _opts.headers = {}
+  request.headers.forEach((value, key) => {
+    _opts.headers[key] = value
+  })
+
+  _opts.counter = ++request.counter
+  const redirectReq = new Request(url.format(redirectUrl), _opts)
+  return {
+    request: redirectReq,
+    options: _opts,
+  }
+}
+
+const fetch = async (request, options) => {
+  const response = CachePolicy.storable(request, options)
+    ? await cache(request, options)
+    : await remote(request, options)
+
+  // if the request wasn't a GET or HEAD, and the response
+  // status is between 200 and 399 inclusive, invalidate the
+  // request url
+  if (!['GET', 'HEAD'].includes(request.method) &&
+      response.status >= 200 &&
+      response.status <= 399)
+    await cache.invalidate(request, options)
+
+  if (!canFollowRedirect(request, response, options))
+    return response
+
+  const redirect = getRedirect(request, response, options)
+  return fetch(redirect.request, redirect.options)
+}
+
+module.exports = fetch

uni-demo/node_modules/make-fetch-happen/lib/index.js

@@ -0,0 +1,40 @@
+const { FetchError, Headers, Request, Response } = require('minipass-fetch')
+
+const configureOptions = require('./options.js')
+const fetch = require('./fetch.js')
+
+const makeFetchHappen = (url, opts) => {
+  const options = configureOptions(opts)
+
+  const request = new Request(url, options)
+  return fetch(request, options)
+}
+
+makeFetchHappen.defaults = (defaultUrl, defaultOptions = {}) => {
+  if (typeof defaultUrl === 'object') {
+    defaultOptions = defaultUrl
+    defaultUrl = null
+  }
+
+  const defaultedFetch = (url, options = {}) => {
+    const finalUrl = url || defaultUrl
+    const finalOptions = {
+      ...defaultOptions,
+      ...options,
+      headers: {
+        ...defaultOptions.headers,
+        ...options.headers,
+      },
+    }
+    return makeFetchHappen(finalUrl, finalOptions)
+  }
+
+  defaultedFetch.defaults = makeFetchHappen.defaults
+  return defaultedFetch
+}
+
+module.exports = makeFetchHappen
+module.exports.FetchError = FetchError
+module.exports.Headers = Headers
+module.exports.Request = Request
+module.exports.Response = Response

uni-demo/node_modules/make-fetch-happen/lib/options.js

@@ -0,0 +1,44 @@
+const conditionalHeaders = [
+  'if-modified-since',
+  'if-none-match',
+  'if-unmodified-since',
+  'if-match',
+  'if-range',
+]
+
+const configureOptions = (opts) => {
+  const {strictSSL, ...options} = { ...opts }
+  options.method = options.method ? options.method.toUpperCase() : 'GET'
+  options.rejectUnauthorized = strictSSL !== false
+
+  if (!options.retry)
+    options.retry = { retries: 0 }
+  else if (typeof options.retry === 'string') {
+    const retries = parseInt(options.retry, 10)
+    if (isFinite(retries))
+      options.retry = { retries }
+    else
+      options.retry = { retries: 0 }
+  } else if (typeof options.retry === 'number')
+    options.retry = { retries: options.retry }
+  else
+    options.retry = { retries: 0, ...options.retry }
+
+  options.cache = options.cache || 'default'
+  if (options.cache === 'default') {
+    const hasConditionalHeader = Object.keys(options.headers || {}).some((name) => {
+      return conditionalHeaders.includes(name.toLowerCase())
+    })
+    if (hasConditionalHeader)
+      options.cache = 'no-store'
+  }
+
+  // cacheManager is deprecated, but if it's set and
+  // cachePath is not we should copy it to the new field
+  if (options.cacheManager && !options.cachePath)
+    options.cachePath = options.cacheManager
+
+  return options
+}
+
+module.exports = configureOptions

uni-demo/node_modules/make-fetch-happen/lib/remote.js

@@ -0,0 +1,102 @@
+const Minipass = require('minipass')
+const MinipassPipeline = require('minipass-pipeline')
+const fetch = require('minipass-fetch')
+const promiseRetry = require('promise-retry')
+const ssri = require('ssri')
+
+const getAgent = require('./agent.js')
+const pkg = require('../package.json')
+
+const USER_AGENT = `${pkg.name}/${pkg.version} (+https://npm.im/${pkg.name})`
+
+const RETRY_ERRORS = [
+  'ECONNRESET', // remote socket closed on us
+  'ECONNREFUSED', // remote host refused to open connection
+  'EADDRINUSE', // failed to bind to a local port (proxy?)
+  'ETIMEDOUT', // someone in the transaction is WAY TOO SLOW
+  'ERR_SOCKET_TIMEOUT', // same as above, but this one comes from agentkeepalive
+  // Known codes we do NOT retry on:
+  // ENOTFOUND (getaddrinfo failure. Either bad hostname, or offline)
+]
+
+const RETRY_TYPES = [
+  'request-timeout',
+]
+
+// make a request directly to the remote source,
+// retrying certain classes of errors as well as
+// following redirects (through the cache if necessary)
+// and verifying response integrity
+const remoteFetch = (request, options) => {
+  const agent = getAgent(request.url, options)
+  if (!request.headers.has('connection'))
+    request.headers.set('connection', agent ? 'keep-alive' : 'close')
+
+  if (!request.headers.has('user-agent'))
+    request.headers.set('user-agent', USER_AGENT)
+
+  // keep our own options since we're overriding the agent
+  // and the redirect mode
+  const _opts = {
+    ...options,
+    agent,
+    redirect: 'manual',
+  }
+
+  return promiseRetry(async (retryHandler, attemptNum) => {
+    const req = new fetch.Request(request, _opts)
+    try {
+      let res = await fetch(req, _opts)
+      if (_opts.integrity && res.status === 200) {
+        // we got a 200 response and the user has specified an expected
+        // integrity value, so wrap the response in an ssri stream to verify it
+        const integrityStream = ssri.integrityStream({ integrity: _opts.integrity })
+        res = new fetch.Response(new MinipassPipeline(res.body, integrityStream), res)
+      }
+
+      res.headers.set('x-fetch-attempts', attemptNum)
+
+      // do not retry POST requests, or requests with a streaming body
+      // do retry requests with a 408, 420, 429 or 500+ status in the response
+      const isStream = Minipass.isStream(req.body)
+      const isRetriable = req.method !== 'POST' &&
+          !isStream &&
+          ([408, 420, 429].includes(res.status) || res.status >= 500)
+
+      if (isRetriable) {
+        if (typeof options.onRetry === 'function')
+          options.onRetry(res)
+
+        return retryHandler(res)
+      }
+
+      return res
+    } catch (err) {
+      const code = (err.code === 'EPROMISERETRY')
+        ? err.retried.code
+        : err.code
+
+      // err.retried will be the thing that was thrown from above
+      // if it's a response, we just got a bad status code and we
+      // can re-throw to allow the retry
+      const isRetryError = err.retried instanceof fetch.Response ||
+        (RETRY_ERRORS.includes(code) && RETRY_TYPES.includes(err.type))
+
+      if (req.method === 'POST' || isRetryError)
+        throw err
+
+      if (typeof options.onRetry === 'function')
+        options.onRetry(err)
+
+      return retryHandler(err)
+    }
+  }, options.retry).catch((err) => {
+    // don't reject for http errors, just return them
+    if (err.status >= 400 && err.type !== 'system')
+      return err
+
+    throw err
+  })
+}
+
+module.exports = remoteFetch