37 lines
1.3 KiB
Go
37 lines
1.3 KiB
Go
// Copyright 2016 The Chihaya Authors. All rights reserved.
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// Use of this source code is governed by the BSD 2-Clause license,
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// which can be found in the LICENSE file.
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package client
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import (
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"github.com/chihaya/chihaya"
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"github.com/chihaya/chihaya/pkg/clientid"
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"github.com/chihaya/chihaya/server/store"
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"github.com/chihaya/chihaya/tracker"
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)
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func init() {
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tracker.RegisterAnnounceMiddleware("client_whitelist", whitelistAnnounceClient)
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}
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// PrefixClient is the prefix to be used for client peer IDs.
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const PrefixClient = "c-"
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// ErrNotWhitelistedClient is returned by an announce middleware if the
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// announcing Client is not whitelisted.
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var ErrNotWhitelistedClient = tracker.ClientError("client not whitelisted")
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// whitelistAnnounceClient provides a middleware that only allows Clients to
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// announce that are stored in the StringStore.
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func whitelistAnnounceClient(next tracker.AnnounceHandler) tracker.AnnounceHandler {
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return func(cfg *chihaya.TrackerConfig, req *chihaya.AnnounceRequest, resp *chihaya.AnnounceResponse) error {
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whitelisted, err := store.MustGetStore().HasString(PrefixClient + clientid.New(string(req.PeerID)))
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if err != nil {
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return err
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} else if !whitelisted {
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return ErrNotWhitelistedClient
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}
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return next(cfg, req, resp)
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}
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}
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