Merge branch 'dev' of http://gitlab.pmf.kg.ac.rs/igrannonica/neuronstellar into logo

1 files changed, 460 insertions, 0 deletions

diff --git a/sandbox/testAppNevena/Front/node_modules/make-fetch-happen/lib/cache/entry.js b/sandbox/testAppNevena/Front/node_modules/make-fetch-happen/lib/cache/entry.js
new file mode 100644
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+++ b/sandbox/testAppNevena/Front/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