9915780197

Committed 13 Jul 2024 12:30AM UTC coverage: 49.268% (-9.1%) from 58.413%

Build # 9915780197

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Merge pull request #8653 from ProofOfKeags/fn-prim

DynComms [0/n]: `fn` package additions

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76.34

/invoices/invoices.go

package invoices

import (
        "errors"
        "fmt"
        "strings"
        "time"

        "github.com/lightningnetwork/lnd/feature"
        "github.com/lightningnetwork/lnd/lntypes"
        "github.com/lightningnetwork/lnd/lnwire"
        "github.com/lightningnetwork/lnd/record"
)

const (
        // MaxMemoSize is maximum size of the memo field within invoices stored
        // in the database.
        MaxMemoSize = 1024

        // MaxPaymentRequestSize is the max size of a payment request for
        // this invoice.
        // TODO(halseth): determine the max length payment request when field
        // lengths are final.
        MaxPaymentRequestSize = 4096
)

var (
        // unknownPreimage is an all-zeroes preimage that indicates that the
        // preimage for this invoice is not yet known.
        UnknownPreimage lntypes.Preimage

        // BlankPayAddr is a sentinel payment address for legacy invoices.
        // Invoices with this payment address are special-cased in the insertion
        // logic to prevent being indexed in the payment address index,
        // otherwise they would cause collisions after the first insertion.
        BlankPayAddr [32]byte
)

// RefModifier is a modification on top of a base invoice ref. It allows the
// caller to opt to skip out on HTLCs for a given payAddr, or only return the
// set of specified HTLCs for a given setID.
type RefModifier uint8

const (
        // DefaultModifier is the base modifier that doesn't change any
        // behavior.
        DefaultModifier RefModifier = iota

        // HtlcSetOnlyModifier can only be used with a setID based invoice ref,
        // and specifies that only the set of HTLCs related to that setID are
        // to be returned.
        HtlcSetOnlyModifier

        // HtlcSetOnlyModifier can only be used with a payAddr based invoice
        // ref, and specifies that the returned invoice shouldn't include any
        // HTLCs at all.
        HtlcSetBlankModifier
)

// InvoiceRef is a composite identifier for invoices. Invoices can be referenced
// by various combinations of payment hash and payment addr, in certain contexts
// only some of these are known. An InvoiceRef and its constructors thus
// encapsulate the valid combinations of query parameters that can be supplied
// to LookupInvoice and UpdateInvoice.
type InvoiceRef struct {
        // payHash is the payment hash of the target invoice. All invoices are
        // currently indexed by payment hash. This value will be used as a
        // fallback when no payment address is known.
        payHash *lntypes.Hash

        // payAddr is the payment addr of the target invoice. Newer invoices
        // (0.11 and up) are indexed by payment address in addition to payment
        // hash, but pre 0.8 invoices do not have one at all. When this value is
        // known it will be used as the primary identifier, falling back to
        // payHash if no value is known.
        payAddr *[32]byte

        // setID is the optional set id for an AMP payment. This can be used to
        // lookup or update the invoice knowing only this value. Queries by set
        // id are only used to facilitate user-facing requests, e.g. lookup,
        // settle or cancel an AMP invoice. The regular update flow from the
        // invoice registry will always query for the invoice by
        // payHash+payAddr.
        setID *[32]byte

        // refModifier allows an invoice ref to include or exclude specific
        // HTLC sets based on the payAddr or setId.
        refModifier RefModifier
}

// InvoiceRefByHash creates an InvoiceRef that queries for an invoice only by
// its payment hash.
func InvoiceRefByHash(payHash lntypes.Hash) InvoiceRef {
        return InvoiceRef{
                payHash: &payHash,
        }
}

// InvoiceRefByHashAndAddr creates an InvoiceRef that first queries for an
// invoice by the provided payment address, falling back to the payment hash if
// the payment address is unknown.
func InvoiceRefByHashAndAddr(payHash lntypes.Hash,
        payAddr [32]byte) InvoiceRef {

        return InvoiceRef{
                payHash: &payHash,
                payAddr: &payAddr,
        }
}

// InvoiceRefByAddr creates an InvoiceRef that queries the payment addr index
// for an invoice with the provided payment address.
func InvoiceRefByAddr(addr [32]byte) InvoiceRef {
        return InvoiceRef{
                payAddr: &addr,
        }
}

// InvoiceRefByAddrBlankHtlc creates an InvoiceRef that queries the payment addr
// index for an invoice with the provided payment address, but excludes any of
// the core HTLC information.
func InvoiceRefByAddrBlankHtlc(addr [32]byte) InvoiceRef {
        return InvoiceRef{
                payAddr:     &addr,
                refModifier: HtlcSetBlankModifier,
        }
}

// InvoiceRefBySetID creates an InvoiceRef that queries the set id index for an
// invoice with the provided setID. If the invoice is not found, the query will
// not fallback to payHash or payAddr.
func InvoiceRefBySetID(setID [32]byte) InvoiceRef {
        return InvoiceRef{
                setID: &setID,
        }
}

// InvoiceRefBySetIDFiltered is similar to the InvoiceRefBySetID identifier,
// but it specifies that the returned set of HTLCs should be filtered to only
// include HTLCs that are part of that set.
func InvoiceRefBySetIDFiltered(setID [32]byte) InvoiceRef {
        return InvoiceRef{
                setID:       &setID,
                refModifier: HtlcSetOnlyModifier,
        }
}

// PayHash returns the optional payment hash of the target invoice.
//
// NOTE: This value may be nil.
func (r InvoiceRef) PayHash() *lntypes.Hash {
        if r.payHash != nil {
                hash := *r.payHash
                return &hash
        }

        return nil
}

// PayAddr returns the optional payment address of the target invoice.
//
// NOTE: This value may be nil.
func (r InvoiceRef) PayAddr() *[32]byte {
        if r.payAddr != nil {
                addr := *r.payAddr
                return &addr
        }

        return nil
}

// SetID returns the optional set id of the target invoice.
//
// NOTE: This value may be nil.
func (r InvoiceRef) SetID() *[32]byte {
        if r.setID != nil {
                id := *r.setID
                return &id
        }

        return nil
}

// Modifier defines the set of available modifications to the base invoice ref
// look up that are available.
func (r InvoiceRef) Modifier() RefModifier {
        return r.refModifier
}

// String returns a human-readable representation of an InvoiceRef.
func (r InvoiceRef) String() string {
        var ids []string
        if r.payHash != nil {
                ids = append(ids, fmt.Sprintf("pay_hash=%v", *r.payHash))
        }
        if r.payAddr != nil {
                ids = append(ids, fmt.Sprintf("pay_addr=%x", *r.payAddr))
        }
        if r.setID != nil {
                ids = append(ids, fmt.Sprintf("set_id=%x", *r.setID))
        }

        return fmt.Sprintf("(%s)", strings.Join(ids, ", "))
}

// ContractState describes the state the invoice is in.
type ContractState uint8

const (
        // ContractOpen means the invoice has only been created.
        ContractOpen ContractState = 0

        // ContractSettled means the htlc is settled and the invoice has been
        // paid.
        ContractSettled ContractState = 1

        // ContractCanceled means the invoice has been canceled.
        ContractCanceled ContractState = 2

        // ContractAccepted means the HTLC has been accepted but not settled
        // yet.
        ContractAccepted ContractState = 3
)

// String returns a human readable identifier for the ContractState type.
func (c ContractState) String() string {
        switch c {
        case ContractOpen:
                return "Open"

        case ContractSettled:
                return "Settled"

        case ContractCanceled:
                return "Canceled"

        case ContractAccepted:
                return "Accepted"
        }

        return "Unknown"
}

// IsFinal returns a boolean indicating whether an invoice state is final.
func (c ContractState) IsFinal() bool {
        return c == ContractSettled || c == ContractCanceled
}

// ContractTerm is a companion struct to the Invoice struct. This struct houses
// the necessary conditions required before the invoice can be considered fully
// settled by the payee.
type ContractTerm struct {
        // FinalCltvDelta is the minimum required number of blocks before htlc
        // expiry when the invoice is accepted.
        FinalCltvDelta int32

        // Expiry defines how long after creation this invoice should expire.
        Expiry time.Duration

        // PaymentPreimage is the preimage which is to be revealed in the
        // occasion that an HTLC paying to the hash of this preimage is
        // extended. Set to nil if the preimage isn't known yet.
        PaymentPreimage *lntypes.Preimage

        // Value is the expected amount of milli-satoshis to be paid to an HTLC
        // which can be satisfied by the above preimage.
        Value lnwire.MilliSatoshi

        // PaymentAddr is a randomly generated value include in the MPP record
        // by the sender to prevent probing of the receiver.
        PaymentAddr [32]byte

        // Features is the feature vectors advertised on the payment request.
        Features *lnwire.FeatureVector
}

// String returns a human-readable description of the prominent contract terms.
func (c ContractTerm) String() string {
        return fmt.Sprintf("amt=%v, expiry=%v, final_cltv_delta=%v", c.Value,
                c.Expiry, c.FinalCltvDelta)
}

// SetID is the extra unique tuple item for AMP invoices. In addition to
// setting a payment address, each repeated payment to an AMP invoice will also
// contain a set ID as well.
type SetID [32]byte

// InvoiceStateAMP is a struct that associates the current state of an AMP
// invoice identified by its set ID along with the set of invoices identified
// by the circuit key. This allows callers to easily look up the latest state
// of an AMP "sub-invoice" and also look up the invoice HLTCs themselves in the
// greater HTLC map index.
type InvoiceStateAMP struct {
        // State is the state of this sub-AMP invoice.
        State HtlcState

        // SettleIndex indicates the location in the settle index that
        // references this instance of InvoiceStateAMP, but only if
        // this value is set (non-zero), and State is HtlcStateSettled.
        SettleIndex uint64

        // SettleDate is the date that the setID was settled.
        SettleDate time.Time

        // InvoiceKeys is the set of circuit keys that can be used to locate
        // the invoices for a given set ID.
        InvoiceKeys map[CircuitKey]struct{}

        // AmtPaid is the total amount that was paid in the AMP sub-invoice.
        // Fetching the full HTLC/invoice state allows one to extract the
        // custom records as well as the break down of the payment splits used
        // when paying.
        AmtPaid lnwire.MilliSatoshi
}

// copy makes a deep copy of the underlying InvoiceStateAMP.
func (i *InvoiceStateAMP) copy() (InvoiceStateAMP, error) {
        result := *i

        // Make a copy of the InvoiceKeys map.
        result.InvoiceKeys = make(map[CircuitKey]struct{})
        for k := range i.InvoiceKeys {
                result.InvoiceKeys[k] = struct{}{}
        }

        // As a safety measure, copy SettleDate. time.Time is concurrency safe
        // except when using any of the (un)marshalling methods.
        settleDateBytes, err := i.SettleDate.MarshalBinary()
        if err != nil {
                return InvoiceStateAMP{}, err
        }

        err = result.SettleDate.UnmarshalBinary(settleDateBytes)
        if err != nil {
                return InvoiceStateAMP{}, err
        }

        return result, nil
}

// AMPInvoiceState represents a type that stores metadata related to the set of
// settled AMP "sub-invoices".
type AMPInvoiceState map[SetID]InvoiceStateAMP

// Invoice is a payment invoice generated by a payee in order to request
// payment for some good or service. The inclusion of invoices within Lightning
// creates a payment work flow for merchants very similar to that of the
// existing financial system within PayPal, etc.  Invoices are added to the
// database when a payment is requested, then can be settled manually once the
// payment is received at the upper layer. For record keeping purposes,
// invoices are never deleted from the database, instead a bit is toggled
// denoting the invoice has been fully settled. Within the database, all
// invoices must have a unique payment hash which is generated by taking the
// sha256 of the payment preimage.
type Invoice struct {
        // Memo is an optional memo to be stored along side an invoice.  The
        // memo may contain further details pertaining to the invoice itself,
        // or any other message which fits within the size constraints.
        Memo []byte

        // PaymentRequest is the encoded payment request for this invoice. For
        // spontaneous (keysend) payments, this field will be empty.
        PaymentRequest []byte

        // CreationDate is the exact time the invoice was created.
        CreationDate time.Time

        // SettleDate is the exact time the invoice was settled.
        SettleDate time.Time

        // Terms are the contractual payment terms of the invoice. Once all the
        // terms have been satisfied by the payer, then the invoice can be
        // considered fully fulfilled.
        //
        // TODO(roasbeef): later allow for multiple terms to fulfill the final
        // invoice: payment fragmentation, etc.
        Terms ContractTerm

        // AddIndex is an auto-incrementing integer that acts as a
        // monotonically increasing sequence number for all invoices created.
        // Clients can then use this field as a "checkpoint" of sorts when
        // implementing a streaming RPC to notify consumers of instances where
        // an invoice has been added before they re-connected.
        //
        // NOTE: This index starts at 1.
        AddIndex uint64

        // SettleIndex is an auto-incrementing integer that acts as a
        // monotonically increasing sequence number for all settled invoices.
        // Clients can then use this field as a "checkpoint" of sorts when
        // implementing a streaming RPC to notify consumers of instances where
        // an invoice has been settled before they re-connected.
        //
        // NOTE: This index starts at 1.
        SettleIndex uint64

        // State describes the state the invoice is in. This is the global
        // state of the invoice which may remain open even when a series of
        // sub-invoices for this invoice has been settled.
        State ContractState

        // AmtPaid is the final amount that we ultimately accepted for pay for
        // this invoice. We specify this value independently as it's possible
        // that the invoice originally didn't specify an amount, or the sender
        // overpaid.
        AmtPaid lnwire.MilliSatoshi

        // Htlcs records all htlcs that paid to this invoice. Some of these
        // htlcs may have been marked as canceled.
        Htlcs map[CircuitKey]*InvoiceHTLC

        // AMPState describes the state of any related sub-invoices AMP to this
        // greater invoice. A sub-invoice is defined by a set of HTLCs with the
        // same set ID that attempt to make one time or recurring payments to
        // this greater invoice. It's possible for a sub-invoice to be canceled
        // or settled, but the greater invoice still open.
        AMPState AMPInvoiceState

        // HodlInvoice indicates whether the invoice should be held in the
        // Accepted state or be settled right away.
        HodlInvoice bool
}

// HTLCSet returns the set of HTLCs belonging to setID and in the provided
// state. Passing a nil setID will return all HTLCs in the provided state in the
// case of legacy or MPP, and no HTLCs in the case of AMP.  Otherwise, the
// returned set will be filtered by the populated setID which is used to
// retrieve AMP HTLC sets.
func (i *Invoice) HTLCSet(setID *[32]byte,
        state HtlcState) map[CircuitKey]*InvoiceHTLC {

        htlcSet := make(map[CircuitKey]*InvoiceHTLC)
        for key, htlc := range i.Htlcs {
                // Only add HTLCs that are in the requested HtlcState.
                if htlc.State != state {
                        continue
                }

                if !htlc.IsInHTLCSet(setID) {
                        continue
                }

                htlcSet[key] = htlc
        }

        return htlcSet
}

// HTLCSetCompliment returns the set of all HTLCs not belonging to setID that
// are in the target state. Passing a nil setID will return no invoices, since
// all MPP HTLCs are part of the same HTLC set.
func (i *Invoice) HTLCSetCompliment(setID *[32]byte,
        state HtlcState) map[CircuitKey]*InvoiceHTLC {

        htlcSet := make(map[CircuitKey]*InvoiceHTLC)
        for key, htlc := range i.Htlcs {
                // Only add HTLCs that are in the requested HtlcState.
                if htlc.State != state {
                        continue
                }

                // We are constructing the compliment, so filter anything that
                // matches this set id.
                if htlc.IsInHTLCSet(setID) {
                        continue
                }

                htlcSet[key] = htlc
        }

        return htlcSet
}

// IsKeysend returns true if the invoice is a Keysend invoice.
func (i *Invoice) IsKeysend() bool {
        // TODO(positiveblue): look for a more reliable way to tests if
        // an invoice is keysend.
        return len(i.PaymentRequest) == 0 && !i.IsAMP()
}

// IsAMP returns true if the invoice is an AMP invoice.
func (i *Invoice) IsAMP() bool {
        if i.Terms.Features == nil {
                return false
        }

        return i.Terms.Features.HasFeature(
                lnwire.AMPRequired,
        )
}

// HtlcState defines the states an htlc paying to an invoice can be in.
type HtlcState uint8

const (
        // HtlcStateAccepted indicates the htlc is locked-in, but not resolved.
        HtlcStateAccepted HtlcState = iota

        // HtlcStateCanceled indicates the htlc is canceled back to the
        // sender.
        HtlcStateCanceled

        // HtlcStateSettled indicates the htlc is settled.
        HtlcStateSettled
)

// InvoiceHTLC contains details about an htlc paying to this invoice.
type InvoiceHTLC struct {
        // Amt is the amount that is carried by this htlc.
        Amt lnwire.MilliSatoshi

        // MppTotalAmt is a field for mpp that indicates the expected total
        // amount.
        MppTotalAmt lnwire.MilliSatoshi

        // AcceptHeight is the block height at which the invoice registry
        // decided to accept this htlc as a payment to the invoice. At this
        // height, the invoice cltv delay must have been met.
        AcceptHeight uint32

        // AcceptTime is the wall clock time at which the invoice registry
        // decided to accept the htlc.
        AcceptTime time.Time

        // ResolveTime is the wall clock time at which the invoice registry
        // decided to settle the htlc.
        ResolveTime time.Time

        // Expiry is the expiry height of this htlc.
        Expiry uint32

        // State indicates the state the invoice htlc is currently in. A
        // canceled htlc isn't just removed from the invoice htlcs map, because
        // we need AcceptHeight to properly cancel the htlc back.
        State HtlcState

        // CustomRecords contains the custom key/value pairs that accompanied
        // the htlc.
        CustomRecords record.CustomSet

        // AMP encapsulates additional data relevant to AMP HTLCs. This includes
        // the AMP onion record, in addition to the HTLC's payment hash and
        // preimage since these are unique to each AMP HTLC, and not the invoice
        // as a whole.
        //
        // NOTE: This value will only be set for AMP HTLCs.
        AMP *InvoiceHtlcAMPData
}

// Copy makes a deep copy of the target InvoiceHTLC.
func (h *InvoiceHTLC) Copy() *InvoiceHTLC {
        result := *h

        // Make a copy of the CustomSet map.
        result.CustomRecords = make(record.CustomSet)
        for k, v := range h.CustomRecords {
                result.CustomRecords[k] = v
        }

        result.AMP = h.AMP.Copy()

        return &result
}

// IsInHTLCSet returns true if this HTLC is part an HTLC set. If nil is passed,
// this method returns true if this is an MPP HTLC. Otherwise, it only returns
// true if the AMP HTLC's set id matches the populated setID.
func (h *InvoiceHTLC) IsInHTLCSet(setID *[32]byte) bool {
        wantAMPSet := setID != nil
        isAMPHtlc := h.AMP != nil

        // Non-AMP HTLCs cannot be part of AMP HTLC sets, and vice versa.
        if wantAMPSet != isAMPHtlc {
                return false
        }

        // Skip AMP HTLCs that have differing set ids.
        if isAMPHtlc && *setID != h.AMP.Record.SetID() {
                return false
        }

        return true
}

// InvoiceHtlcAMPData is a struct hodling the additional metadata stored for
// each received AMP HTLC. This includes the AMP onion record, in addition to
// the HTLC's payment hash and preimage.
type InvoiceHtlcAMPData struct {
        // AMP is a copy of the AMP record presented in the onion payload
        // containing the information necessary to correlate and settle a
        // spontaneous HTLC set. Newly accepted legacy keysend payments will
        // also have this field set as we automatically promote them into an AMP
        // payment for internal processing.
        Record record.AMP

        // Hash is an HTLC-level payment hash that is stored only for AMP
        // payments. This is done because an AMP HTLC will carry a different
        // payment hash from the invoice it might be satisfying, so we track the
        // payment hashes individually to able to compute whether or not the
        // reconstructed preimage correctly matches the HTLC's hash.
        Hash lntypes.Hash

        // Preimage is an HTLC-level preimage that satisfies the AMP HTLC's
        // Hash. The preimage will be derived either from secret share
        // reconstruction of the shares in the AMP payload.
        //
        // NOTE: Preimage will only be present once the HTLC is in
        // HtlcStateSettled.
        Preimage *lntypes.Preimage
}

// Copy returns a deep copy of the InvoiceHtlcAMPData.
func (d *InvoiceHtlcAMPData) Copy() *InvoiceHtlcAMPData {
        if d == nil {
                return nil
        }

        var preimage *lntypes.Preimage
        if d.Preimage != nil {
                pimg := *d.Preimage
                preimage = &pimg
        }

        return &InvoiceHtlcAMPData{
                Record:   d.Record,
                Hash:     d.Hash,
                Preimage: preimage,
        }
}

// HtlcAcceptDesc describes the details of a newly accepted htlc.
type HtlcAcceptDesc struct {
        // AcceptHeight is the block height at which this htlc was accepted.
        AcceptHeight int32

        // Amt is the amount that is carried by this htlc.
        Amt lnwire.MilliSatoshi

        // MppTotalAmt is a field for mpp that indicates the expected total
        // amount.
        MppTotalAmt lnwire.MilliSatoshi

        // Expiry is the expiry height of this htlc.
        Expiry uint32

        // CustomRecords contains the custom key/value pairs that accompanied
        // the htlc.
        CustomRecords record.CustomSet

        // AMP encapsulates additional data relevant to AMP HTLCs. This includes
        // the AMP onion record, in addition to the HTLC's payment hash and
        // preimage since these are unique to each AMP HTLC, and not the invoice
        // as a whole.
        //
        // NOTE: This value will only be set for AMP HTLCs.
        AMP *InvoiceHtlcAMPData
}

// UpdateType is an enum that describes the type of update that was applied to
// an invoice.
type UpdateType uint8

const (
        // UnknownUpdate indicates that the UpdateType has not been set for a
        // given udpate. This kind of updates are not allowed.
        UnknownUpdate UpdateType = iota

        // CancelHTLCsUpdate indicates that this update cancels one or more
        // HTLCs.
        CancelHTLCsUpdate

        // AddHTLCsUpdate indicates that this update adds one or more HTLCs.
        AddHTLCsUpdate

        // SettleHodlInvoiceUpdate indicates that this update settles one or
        // more HTLCs from a hodl invoice.
        SettleHodlInvoiceUpdate

        // CancelInvoiceUpdate indicates that this update is trying to cancel
        // an invoice.
        CancelInvoiceUpdate
)

// String returns a human readable string for the UpdateType.
func (u UpdateType) String() string {
        switch u {
        case CancelHTLCsUpdate:
                return "CancelHTLCsUpdate"

        case AddHTLCsUpdate:
                return "AddHTLCsUpdate"

        case SettleHodlInvoiceUpdate:
                return "SettleHodlInvoiceUpdate"

        case CancelInvoiceUpdate:
                return "CancelInvoiceUpdate"

        default:
                return fmt.Sprintf("unknown invoice update type: %d", u)
        }
}

// InvoiceUpdateDesc describes the changes that should be applied to the
// invoice.
type InvoiceUpdateDesc struct {
        // State is the new state that this invoice should progress to. If nil,
        // the state is left unchanged.
        State *InvoiceStateUpdateDesc

        // CancelHtlcs describes the htlcs that need to be canceled.
        CancelHtlcs map[CircuitKey]struct{}

        // AddHtlcs describes the newly accepted htlcs that need to be added to
        // the invoice.
        AddHtlcs map[CircuitKey]*HtlcAcceptDesc

        // SetID is an optional set ID for AMP invoices that allows operations
        // to be more efficient by ensuring we don't need to read out the
        // entire HTLC set each timee an HTLC is to be cancelled.
        SetID *SetID

        // UpdateType indicates what type of update is being applied.
        UpdateType UpdateType
}

// InvoiceStateUpdateDesc describes an invoice-level state transition.
type InvoiceStateUpdateDesc struct {
        // NewState is the new state that this invoice should progress to.
        NewState ContractState

        // Preimage must be set to the preimage when NewState is settled.
        Preimage *lntypes.Preimage

        // HTLCPreimages set the HTLC-level preimages stored for AMP HTLCs.
        // These are only learned when settling the invoice as a whole. Must be
        // set when settling an invoice with non-nil SetID.
        HTLCPreimages map[CircuitKey]lntypes.Preimage

        // SetID identifies a specific set of HTLCs destined for the same
        // invoice as part of a larger AMP payment. This value will be nil for
        // legacy or MPP payments.
        SetID *[32]byte
}

// InvoiceUpdateCallback is a callback used in the db transaction to update the
// invoice.
type InvoiceUpdateCallback = func(invoice *Invoice) (*InvoiceUpdateDesc, error)

// ValidateInvoice assures the invoice passes the checks for all the relevant
// constraints.
func ValidateInvoice(i *Invoice, paymentHash lntypes.Hash) error {
        // Avoid conflicts with all-zeroes magic value in the database.
        if paymentHash == UnknownPreimage.Hash() {
                return fmt.Errorf("cannot use hash of all-zeroes preimage")
        }

        if len(i.Memo) > MaxMemoSize {
                return fmt.Errorf("max length a memo is %v, and invoice "+
                        "of length %v was provided", MaxMemoSize, len(i.Memo))
        }
        if len(i.PaymentRequest) > MaxPaymentRequestSize {
                return fmt.Errorf("max length of payment request is %v, "+
                        "length provided was %v", MaxPaymentRequestSize,
                        len(i.PaymentRequest))
        }
        if i.Terms.Features == nil {
                return errors.New("invoice must have a feature vector")
        }

        err := feature.ValidateDeps(i.Terms.Features)
        if err != nil {
                return err
        }

        if i.requiresPreimage() && i.Terms.PaymentPreimage == nil {
                return errors.New("this invoice must have a preimage")
        }

        if len(i.Htlcs) > 0 {
                return ErrInvoiceHasHtlcs
        }

        return nil
}

// requiresPreimage returns true if the invoice requires a preimage to be valid.
func (i *Invoice) requiresPreimage() bool {
        // AMP invoices and hodl invoices are allowed to have no preimage
        // specified.
        if i.HodlInvoice || i.IsAMP() {
                return false
        }

        return true
}

// IsPending returns true if the invoice is in ContractOpen state.
func (i *Invoice) IsPending() bool {
        return i.State == ContractOpen || i.State == ContractAccepted
}

// copySlice allocates a new slice and copies the source into it.
func copySlice(src []byte) []byte {
        dest := make([]byte, len(src))
        copy(dest, src)
        return dest
}

// CopyInvoice makes a deep copy of the supplied invoice.
func CopyInvoice(src *Invoice) (*Invoice, error) {
        dest := Invoice{
                Memo:           copySlice(src.Memo),
                PaymentRequest: copySlice(src.PaymentRequest),
                CreationDate:   src.CreationDate,
                SettleDate:     src.SettleDate,
                Terms:          src.Terms,
                AddIndex:       src.AddIndex,
                SettleIndex:    src.SettleIndex,
                State:          src.State,
                AmtPaid:        src.AmtPaid,
                Htlcs: make(
                        map[CircuitKey]*InvoiceHTLC, len(src.Htlcs),
                ),
                AMPState:    make(map[SetID]InvoiceStateAMP),
                HodlInvoice: src.HodlInvoice,
        }

        dest.Terms.Features = src.Terms.Features.Clone()

        if src.Terms.PaymentPreimage != nil {
                preimage := *src.Terms.PaymentPreimage
                dest.Terms.PaymentPreimage = &preimage
        }

        for k, v := range src.Htlcs {
                dest.Htlcs[k] = v.Copy()
        }

        // Lastly, copy the amp invoice state.
        for k, v := range src.AMPState {
                ampInvState, err := v.copy()
                if err != nil {
                        return nil, err
                }

                dest.AMPState[k] = ampInvState
        }

        return &dest, nil
}

// InvoiceDeleteRef holds a reference to an invoice to be deleted.
type InvoiceDeleteRef struct {
        // PayHash is the payment hash of the target invoice. All invoices are
        // currently indexed by payment hash.
        PayHash lntypes.Hash

        // PayAddr is the payment addr of the target invoice. Newer invoices
        // (0.11 and up) are indexed by payment address in addition to payment
        // hash, but pre 0.8 invoices do not have one at all.
        PayAddr *[32]byte

        // AddIndex is the add index of the invoice.
        AddIndex uint64

        // SettleIndex is the settle index of the invoice.
        SettleIndex uint64
}

lightningnetwork / lnd / 9915780197

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