Merge pull request #1561 from lukechilds/psbt-tx-getters

PSBT internal transaction property getters

Author: junderw

src/bufferutils.js

@@ -41,6 +41,12 @@ function reverseBuffer(buffer) {
   return buffer;
 }
 exports.reverseBuffer = reverseBuffer;
+function cloneBuffer(buffer) {
+  const clone = Buffer.alloc(buffer.length);
+  buffer.copy(clone);
+  return buffer;
+}
+exports.cloneBuffer = cloneBuffer;
 /**
  * Helper class for serialization of bitcoin data types into a pre-allocated buffer.
  */

src/psbt.js

@@ -97,6 +97,32 @@ class Psbt {
   get inputCount() {
     return this.data.inputs.length;
   }
+  get version() {
+    return this.__CACHE.__TX.version;
+  }
+  set version(version) {
+    this.setVersion(version);
+  }
+  get locktime() {
+    return this.__CACHE.__TX.locktime;
+  }
+  set locktime(locktime) {
+    this.setLocktime(locktime);
+  }
+  get txInputs() {
+    return this.__CACHE.__TX.ins.map(input => ({
+      hash: bufferutils_1.cloneBuffer(input.hash),
+      index: input.index,
+      sequence: input.sequence,
+    }));
+  }
+  get txOutputs() {
+    return this.__CACHE.__TX.outs.map(output => ({
+      script: bufferutils_1.cloneBuffer(output.script),
+      value: output.value,
+      address: address_1.fromOutputScript(output.script, this.opts.network),
+    }));
+  }
   combine(...those) {
     this.data.combine(...those.map(o => o.data));
     return this;

test/psbt.spec.ts

@@ -523,12 +523,9 @@ describe(`Psbt`, () => {
       });
 
       assert.strictEqual(psbt.inputCount, 1);
-      assert.strictEqual(
-        (psbt as any).__CACHE.__TX.ins[0].sequence,
-        0xffffffff,
-      );
+      assert.strictEqual(psbt.txInputs[0].sequence, 0xffffffff);
       psbt.setInputSequence(0, 0);
-      assert.strictEqual((psbt as any).__CACHE.__TX.ins[0].sequence, 0);
+      assert.strictEqual(psbt.txInputs[0].sequence, 0);
     });
 
     it('throws if input index is too high', () => {

ts_src/bufferutils.ts

@@ -48,6 +48,12 @@ export function reverseBuffer(buffer: Buffer): Buffer {
   return buffer;
 }
 
+export function cloneBuffer(buffer: Buffer): Buffer {
+  const clone = Buffer.alloc(buffer.length);
+  buffer.copy(clone);
+  return buffer;
+}
+
 /**
  * Helper class for serialization of bitcoin data types into a pre-allocated buffer.
  */

ts_src/psbt.ts

@@ -11,10 +11,11 @@ import {
   Transaction as ITransaction,
   TransactionFromBuffer,
   TransactionInput,
+  TransactionOutput,
 } from 'bip174/src/lib/interfaces';
 import { checkForInput } from 'bip174/src/lib/utils';
-import { toOutputScript } from './address';
-import { reverseBuffer } from './bufferutils';
+import { fromOutputScript, toOutputScript } from './address';
+import { cloneBuffer, reverseBuffer } from './bufferutils';
 import { hash160 } from './crypto';
 import {
   fromPublicKey as ecPairFromPublicKey,
@@ -129,6 +130,38 @@ export class Psbt {
     return this.data.inputs.length;
   }
 
+  get version(): number {
+    return this.__CACHE.__TX.version;
+  }
+
+  set version(version: number) {
+    this.setVersion(version);
+  }
+
+  get locktime(): number {
+    return this.__CACHE.__TX.locktime;
+  }
+
+  set locktime(locktime: number) {
+    this.setLocktime(locktime);
+  }
+
+  get txInputs(): TransactionInput[] {
+    return this.__CACHE.__TX.ins.map(input => ({
+      hash: cloneBuffer(input.hash),
+      index: input.index,
+      sequence: input.sequence,
+    }));
+  }
+
+  get txOutputs(): TransactionOutput[] {
+    return this.__CACHE.__TX.outs.map(output => ({
+      script: cloneBuffer(output.script),
+      value: output.value,
+      address: fromOutputScript(output.script, this.opts.network),
+    }));
+  }
+
   combine(...those: Psbt[]): this {
     this.data.combine(...those.map(o => o.data));
     return this;

types/bufferutils.d.ts

@@ -1,6 +1,7 @@
 export declare function readUInt64LE(buffer: Buffer, offset: number): number;
 export declare function writeUInt64LE(buffer: Buffer, value: number, offset: number): number;
 export declare function reverseBuffer(buffer: Buffer): Buffer;
+export declare function cloneBuffer(buffer: Buffer): Buffer;
 /**
  * Helper class for serialization of bitcoin data types into a pre-allocated buffer.
  */

types/psbt.d.ts

@@ -1,5 +1,5 @@
 import { Psbt as PsbtBase } from 'bip174';
-import { KeyValue, PsbtGlobalUpdate, PsbtInput, PsbtInputUpdate, PsbtOutput, PsbtOutputUpdate, TransactionInput } from 'bip174/src/lib/interfaces';
+import { KeyValue, PsbtGlobalUpdate, PsbtInput, PsbtInputUpdate, PsbtOutput, PsbtOutputUpdate, TransactionInput, TransactionOutput } from 'bip174/src/lib/interfaces';
 import { Signer, SignerAsync } from './ecpair';
 import { Network } from './networks';
 import { Transaction } from './transaction';
@@ -44,6 +44,10 @@ export declare class Psbt {
     private opts;
     constructor(opts?: PsbtOptsOptional, data?: PsbtBase);
     readonly inputCount: number;
+    version: number;
+    locktime: number;
+    readonly txInputs: TransactionInput[];
+    readonly txOutputs: TransactionOutput[];
     combine(...those: Psbt[]): this;
     clone(): Psbt;
     setMaximumFeeRate(satoshiPerByte: number): void;