Merge pull request #725 from mempool/simon/liquid-unblinding-refactor
Refactored liquid unblinding code into a new file.
This commit is contained in:
softsimon
GitHub
commit
bb407c0b42
138
frontend/src/app/components/transaction/liquid-ublinding.ts
Normal file
138
frontend/src/app/components/transaction/liquid-ublinding.ts
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@ -0,0 +1,138 @@
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import { Transaction } from '../../interfaces/electrs.interface';
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// Parse the blinders data from a string encoded as a comma separated list, in the following format:
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// <value_in_satoshis>,<asset_tag_hex>,<amount_blinder_hex>,<asset_blinder_hex>
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// This can be repeated with a comma separator to specify blinders for multiple outputs.
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export class LiquidUnblinding {
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commitments: Map<any, any>;
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parseBlinders(str: string) {
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const parts = str.split(',');
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const blinders = [];
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while (parts.length) {
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blinders.push({
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value: this.verifyNum(parts.shift()),
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asset: this.verifyHex32(parts.shift()),
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value_blinder: this.verifyHex32(parts.shift()),
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asset_blinder: this.verifyHex32(parts.shift()),
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});
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}
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return blinders;
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}
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verifyNum(num: string) {
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if (!+num) {
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throw new Error('Invalid blinding data (invalid number)');
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}
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return +num;
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}
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verifyHex32(str: string) {
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if (!str || !/^[0-9a-f]{64}$/i.test(str)) {
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throw new Error('Invalid blinding data (invalid hex)');
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}
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return str;
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}
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async makeCommitmentMap(blinders: any) {
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const libwally = await import('./libwally.js');
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await libwally.load();
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const commitments = new Map();
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blinders.forEach(b => {
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const { asset_commitment, value_commitment } =
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libwally.generate_commitments(b.value, b.asset, b.value_blinder, b.asset_blinder);
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commitments.set(`${asset_commitment}:${value_commitment}`, {
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asset: b.asset,
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value: b.value,
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});
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});
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return commitments;
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}
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// Look for the given output, returning an { value, asset } object
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find(vout: any) {
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return vout.assetcommitment && vout.valuecommitment &&
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this.commitments.get(`${vout.assetcommitment}:${vout.valuecommitment}`);
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}
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// Lookup all transaction inputs/outputs and attach the unblinded data
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tryUnblindTx(tx: Transaction) {
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if (tx) {
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if (tx._unblinded) { return tx._unblinded; }
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let matched = 0;
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if (tx.vout !== undefined) {
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tx.vout.forEach(vout => matched += +this.tryUnblindOut(vout));
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tx.vin.filter(vin => vin.prevout).forEach(vin => matched += +this.tryUnblindOut(vin.prevout));
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}
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if (this.commitments !== undefined) {
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tx._unblinded = { matched, total: this.commitments.size };
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this.deduceBlinded(tx);
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if (matched < this.commitments.size) {
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throw new Error(`Error: Invalid blinding data.`)
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}
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tx._deduced = false; // invalidate cache so deduction is attempted again
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return tx._unblinded;
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}
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}
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}
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// Look the given output and attach the unblinded data
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tryUnblindOut(vout: any) {
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const unblinded = this.find(vout);
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if (unblinded) { Object.assign(vout, unblinded); }
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return !!unblinded;
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}
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// Attempt to deduce the blinded input/output based on the available information
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deduceBlinded(tx: any) {
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if (tx._deduced) { return; }
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tx._deduced = true;
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// Find ins/outs with unknown amounts (blinded ant not revealed via the `#blinded` hash fragment)
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const unknownIns = tx.vin.filter(vin => vin.prevout && vin.prevout.value == null);
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const unknownOuts = tx.vout.filter(vout => vout.value == null);
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// If the transaction has a single unknown input/output, we can deduce its asset/amount
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// based on the other known inputs/outputs.
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if (unknownIns.length + unknownOuts.length === 1) {
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// Keep a per-asset tally of all known input amounts, minus all known output amounts
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const totals = new Map();
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tx.vin.filter(vin => vin.prevout && vin.prevout.value != null)
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.forEach(({ prevout }) =>
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totals.set(prevout.asset, (totals.get(prevout.asset) || 0) + prevout.value));
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tx.vout.filter(vout => vout.value != null)
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.forEach(vout =>
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totals.set(vout.asset, (totals.get(vout.asset) || 0) - vout.value));
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// There should only be a single asset where the inputs and outputs amounts mismatch,
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// which is the asset of the blinded input/output
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const remainder = Array.from(totals.entries()).filter(([ asset, value ]) => value !== 0);
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if (remainder.length !== 1) { throw new Error('unexpected remainder while deducing blinded tx'); }
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const [ blindedAsset, blindedValue ] = remainder[0];
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// A positive remainder (when known in > known out) is the asset/amount of the unknown blinded output,
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// a negative one is the input.
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if (blindedValue > 0) {
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if (!unknownOuts.length) { throw new Error('expected unknown output'); }
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unknownOuts[0].asset = blindedAsset;
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unknownOuts[0].value = blindedValue;
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} else {
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if (!unknownIns.length) { throw new Error('expected unknown input'); }
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unknownIns[0].prevout.asset = blindedAsset;
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unknownIns[0].prevout.value = blindedValue * -1;
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}
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}
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}
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async checkUnblindedTx(tx: Transaction) {
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const windowLocationHash = window.location.hash.substring('#blinded='.length);
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if (windowLocationHash.length > 0) {
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const blinders = this.parseBlinders(windowLocationHash);
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if (blinders) {
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this.commitments = await this.makeCommitmentMap(blinders);
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this.tryUnblindTx(tx);
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}
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}
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}
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}
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@ -17,6 +17,7 @@ import { AudioService } from 'src/app/services/audio.service';
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import { ApiService } from 'src/app/services/api.service';
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import { SeoService } from 'src/app/services/seo.service';
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import { CpfpInfo } from 'src/app/interfaces/node-api.interface';
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import { LiquidUnblinding } from './liquid-ublinding';
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@Component({
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selector: 'app-transaction',
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@ -40,9 +41,9 @@ export class TransactionComponent implements OnInit, OnDestroy {
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cpfpInfo: CpfpInfo | null;
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showCpfpDetails = false;
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fetchCpfp$ = new Subject<string>();
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commitments: Map<any, any>;
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now = new Date().getTime();
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timeAvg$: Observable<number>;
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liquidUnblinding = new LiquidUnblinding();
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constructor(
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private route: ActivatedRoute,
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@ -123,10 +124,8 @@ export class TransactionComponent implements OnInit, OnDestroy {
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this.subscription = this.route.paramMap
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.pipe(
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switchMap(async (params: ParamMap) => {
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switchMap((params: ParamMap) => {
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this.txId = params.get('id') || '';
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await this.checkUnblindedTx();
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this.seoService.setTitle(
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$localize`:@@bisq.transaction.browser-title:Transaction: ${this.txId}:INTERPOLATION:`
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);
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@ -157,8 +156,7 @@ export class TransactionComponent implements OnInit, OnDestroy {
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);
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})
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)
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.subscribe(
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async (tx: Transaction) => {
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.subscribe((tx: Transaction) => {
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if (!tx) {
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return;
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}
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@ -199,7 +197,12 @@ export class TransactionComponent implements OnInit, OnDestroy {
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this.fetchCpfp$.next(this.tx.txid);
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}
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}
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await this.checkUnblindedTx();
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if (this.network === 'liquid') {
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this.liquidUnblinding.checkUnblindedTx(this.tx)
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.catch((error) => {
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this.errorUnblinded = error;
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});
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}
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},
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(error) => {
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this.error = error;
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@ -294,145 +297,4 @@ export class TransactionComponent implements OnInit, OnDestroy {
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this.fetchCpfpSubscription.unsubscribe();
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this.leaveTransaction();
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}
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// Parse the blinders data from a string encoded as a comma separated list, in the following format:
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// <value_in_satoshis>,<asset_tag_hex>,<amount_blinder_hex>,<asset_blinder_hex>
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// This can be repeated with a comma separator to specify blinders for multiple outputs.
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parseBlinders(str: string) {
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const parts = str.split(',');
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const blinders = [];
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while (parts.length) {
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blinders.push({
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value: this.verifyNum(parts.shift()),
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asset: this.verifyHex32(parts.shift()),
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value_blinder: this.verifyHex32(parts.shift()),
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asset_blinder: this.verifyHex32(parts.shift()),
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});
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}
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return blinders;
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}
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verifyNum(num: string) {
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if (!+num) {
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throw new Error('Invalid blinding data (invalid number)');
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}
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return +num;
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}
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verifyHex32(str: string) {
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if (!str || !/^[0-9a-f]{64}$/i.test(str)) {
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throw new Error('Invalid blinding data (invalid hex)');
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}
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return str;
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}
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async makeCommitmentMap(blinders: any) {
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const libwally = await import('./libwally.js');
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await libwally.load();
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const commitments = new Map();
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blinders.forEach(b => {
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const { asset_commitment, value_commitment } =
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libwally.generate_commitments(b.value, b.asset, b.value_blinder, b.asset_blinder);
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commitments.set(`${asset_commitment}:${value_commitment}`, {
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asset: b.asset,
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value: b.value,
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});
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});
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return commitments;
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}
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// Look for the given output, returning an { value, asset } object
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find(vout: any) {
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return vout.assetcommitment && vout.valuecommitment &&
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this.commitments.get(`${vout.assetcommitment}:${vout.valuecommitment}`);
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}
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// Lookup all transaction inputs/outputs and attach the unblinded data
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tryUnblindTx(tx: any) {
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if (tx) {
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if (tx._unblinded) { return tx._unblinded; }
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let matched = 0;
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if (tx.vout !== undefined) {
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tx.vout.forEach(vout => matched += +this.tryUnblindOut(vout));
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tx.vin.filter(vin => vin.prevout).forEach(vin => matched += +this.tryUnblindOut(vin.prevout));
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}
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if (this.commitments !== undefined) {
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tx._unblinded = { matched, total: this.commitments.size };
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this.deduceBlinded(tx);
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if (matched < this.commitments.size) {
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this.errorUnblinded = `Error: Invalid blinding data.`;
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}
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tx._deduced = false; // invalidate cache so deduction is attempted again
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return tx._unblinded;
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}
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}
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}
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// Look the given output and attach the unblinded data
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tryUnblindOut(vout: any) {
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const unblinded = this.find(vout);
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if (unblinded) { Object.assign(vout, unblinded); }
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return !!unblinded;
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}
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// Attempt to deduce the blinded input/output based on the available information
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deduceBlinded(tx: any) {
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if (tx._deduced) { return; }
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tx._deduced = true;
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// Find ins/outs with unknown amounts (blinded ant not revealed via the `#blinded` hash fragment)
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const unknownIns = tx.vin.filter(vin => vin.prevout && vin.prevout.value == null);
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const unknownOuts = tx.vout.filter(vout => vout.value == null);
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// If the transaction has a single unknown input/output, we can deduce its asset/amount
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// based on the other known inputs/outputs.
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if (unknownIns.length + unknownOuts.length === 1) {
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// Keep a per-asset tally of all known input amounts, minus all known output amounts
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const totals = new Map();
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tx.vin.filter(vin => vin.prevout && vin.prevout.value != null)
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.forEach(({ prevout }) =>
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totals.set(prevout.asset, (totals.get(prevout.asset) || 0) + prevout.value));
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tx.vout.filter(vout => vout.value != null)
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.forEach(vout =>
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totals.set(vout.asset, (totals.get(vout.asset) || 0) - vout.value));
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// There should only be a single asset where the inputs and outputs amounts mismatch,
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// which is the asset of the blinded input/output
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const remainder = Array.from(totals.entries()).filter(([ asset, value ]) => value !== 0);
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if (remainder.length !== 1) { throw new Error('unexpected remainder while deducing blinded tx'); }
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const [ blindedAsset, blindedValue ] = remainder[0];
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// A positive remainder (when known in > known out) is the asset/amount of the unknown blinded output,
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// a negative one is the input.
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if (blindedValue > 0) {
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if (!unknownOuts.length) { throw new Error('expected unknown output'); }
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unknownOuts[0].asset = blindedAsset;
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unknownOuts[0].value = blindedValue;
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} else {
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if (!unknownIns.length) { throw new Error('expected unknown input'); }
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unknownIns[0].prevout.asset = blindedAsset;
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unknownIns[0].prevout.value = blindedValue * -1;
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}
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}
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}
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async checkUnblindedTx() {
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try {
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if (this.network === 'liquid') {
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const windowLocationHash = window.location.hash.substring('#blinded='.length);
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if (windowLocationHash.length > 0) {
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const blinders = this.parseBlinders(windowLocationHash);
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if (blinders) {
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this.commitments = await this.makeCommitmentMap(blinders);
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this.tryUnblindTx(this.tx);
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}
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}
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}
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} catch (error) {
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this.errorUnblinded = error;
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}
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}
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}
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