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185 lines
3.6 KiB
Plaintext
185 lines
3.6 KiB
Plaintext
:: BIP174: PSBTs
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:: https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki
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::
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/- sur=bitcoin
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/+ bcu=bitcoin-utils
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=, sur
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=, bcu
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|%
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++ en
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|%
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++ globals
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|= rawtx=hexb
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^- map:psbt
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:~ [[1 0x0] rawtx]
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==
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::
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++ input
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|= [only-witness=? i=in:psbt]
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^- map:psbt
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%+ weld
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?: only-witness ~
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~[[1^0x0 rawtx.i]]
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:~ (witness-tx i)
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(hdkey %input hdkey.i)
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==
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::
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++ output
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|= =out:psbt
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^- map:psbt
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?~ hk.out ~
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:~ (hdkey %output u.hk.out)
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==
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::
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++ witness-tx
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|= i=in:psbt
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^- keyval:psbt
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:- [1 0x1]
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%- cat:byt
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:~ (flip:byt 8^value.utxo.i)
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1^0x16
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2^0x14
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(hash-160 pubkey.hdkey.i)
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==
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::
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++ hdkey
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|= [=target:psbt h=^hdkey]
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^- keyval:psbt
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=/ typ=@ux
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?- target
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%input 0x6
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%output 0x2
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==
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=/ coin-type=hexb
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?- network.h
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%main
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1^0x0
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%testnet
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1^0x1
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%regtest
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1^0x1
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==
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:- (cat:byt ~[1^typ pubkey.h])
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%- cat:byt
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:~ fprint.h
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1^`@ux`bipt.h 3^0x80
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coin-type 3^0x80
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4^0x80
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1^`@ux`chyg.h 3^0x0
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(flip:byt 4^idx.h)
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==
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::
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++ keyval-byts
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|= kv=keyval:psbt
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^- hexb
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%- cat:byt
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:~ 1^wid.key.kv
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key.kv
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1^wid.val.kv
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val.kv
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==
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::
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++ map-byts
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|= m=map:psbt
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^- (unit hexb)
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?~ m ~
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:- ~
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%- cat:byt
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(turn m keyval-byts)
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--
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++ base64
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|= b=hexb
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^- base64:psbt
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%- en:base64:mimes:html
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(flip:byt b)
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:: +encode: make base64 cord of PSBT
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:: - only-witness: don't include non-witness UTXO
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::
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++ encode
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|= $: only-witness=?
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rawtx=hexb
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txid=hexb
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inputs=(list in:psbt)
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outputs=(list out:psbt)
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==
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^- base64:psbt
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=/ sep=(unit hexb) `1^0x0
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=/ final=(list (unit hexb))
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%+ join sep
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%+ turn
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%- zing
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:~ ~[(globals:en rawtx)]
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(turn inputs (cury input:en only-witness))
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(turn outputs output:en)
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==
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map-byts:en
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%- base64:en
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^- byts
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%- cat:byt
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%+ weld ~[[5 0x70.7362.74ff]]
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(murn (snoc final sep) same)
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::
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++ parse
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|= psbt-base64=cord
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^- (list map:psbt)
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=/ todo=hexb
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(drop:byt 5 (to-byts psbt-base64))
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=| acc=(list map:psbt)
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=| m=map:psbt
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|-
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?: =(wid.todo 0)
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(snoc acc m)
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:: 0x0: map separator
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::
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?: =(1^0x0 (take:byt 1 todo))
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$(acc (snoc acc m), m *map:psbt, todo (drop:byt 1 todo))
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=^ kv todo (next-keyval todo)
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$(m (snoc m kv))
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:: +get-txid: extract txid from a valid PSBT
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::
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++ get-txid
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|= psbt-base64=cord
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^- hexb
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=/ tx=hexb
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%- raw-tx
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%+ drop:byt 5
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(to-byts psbt-base64)
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%- flip:byt
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(dsha256 tx)
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:: +raw-tx: extract hex transaction
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:: looks for key 0x0 in global map
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:: crashes if tx not in hex
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::
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++ raw-tx
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|= b=hexb
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^- hexb
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|-
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?: =(wid.b 0) !!
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?: =(1^0x0 (take:byt 1 b)) !!
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=/ nk (next-keyval b)
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?: =(0x0 dat.key.kv.nk)
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val.kv.nk
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$(b rest.nk)
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:: +next-keyval: returns next key-val in a PSBT map
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:: input first byte must be a map key length
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::
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++ next-keyval
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|= b=hexb
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^- [kv=keyval:psbt rest=hexb]
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=/ klen dat:(take:byt 1 b)
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=/ k (take:byt klen (drop:byt 1 b))
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=/ vlen dat:(take:byt 1 (drop:byt (add 1 klen) b))
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=/ v (take:byt vlen (drop:byt (add 2 klen) b))
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?> ?&((gth wid.k 0) (gth wid.v 0))
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:- [k v]
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(drop:byt ;:(add 2 klen vlen) b)
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::
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++ to-byts
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|= psbt-base64=cord
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^- hexb
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~| "Invalid PSBT"
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=+ p=(de:base64:mimes:html psbt-base64)
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?~ p !!
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(flip:byt u.p)
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--
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