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We've covered all the logic for building a blinded path to ourselves and putting that into an invoice - so now we start preparing to actually be able to recognise the incoming payment as one from a blinded path we created. The incoming update_add_htlc will have an `encrypted_recipient_data` blob for us that we would have put in the original invoice. From this we extract the PathID which we wrote. We consider this the payment address and we use this to derive the associated invoice location. Blinded path payments will not include MPP records, so the payment address and total payment amount must be gleaned from the pathID and new totalAmtMsat onion field respectively. This commit only covers the final hop payload of a hop in a blinded path. Dummy hops will be handled in the following commit.
36 lines
1.3 KiB
Go
36 lines
1.3 KiB
Go
package hop
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import (
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/lightningnetwork/lnd/lnwire"
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)
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// ForwardingInfo contains all the information that is necessary to forward and
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// incoming HTLC to the next hop encoded within a valid HopIterator instance.
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// Forwarding links are to use this information to authenticate the information
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// received within the incoming HTLC, to ensure that the prior hop didn't
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// tamper with the end-to-end routing information at all.
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type ForwardingInfo struct {
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// NextHop is the channel ID of the next hop. The received HTLC should
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// be forwarded to this particular channel in order to continue the
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// end-to-end route.
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NextHop lnwire.ShortChannelID
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// AmountToForward is the amount of milli-satoshis that the receiving
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// node should forward to the next hop.
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AmountToForward lnwire.MilliSatoshi
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// OutgoingCTLV is the specified value of the CTLV timelock to be used
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// in the outgoing HTLC.
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OutgoingCTLV uint32
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// NextBlinding is an optional blinding point to be passed to the next
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// node in UpdateAddHtlc. This field is set if the htlc is part of a
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// blinded route.
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NextBlinding lnwire.BlindingPointRecord
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// PathID is a secret identifier that the creator of a blinded path
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// sets for itself to ensure that the blinded path has been used in the
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// correct context.
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PathID *chainhash.Hash
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}
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