wallet: create non-templated transaction.

CHANGELOG.md

@@ -9,8 +9,13 @@
 - `PUT /wallet/:id` Creating a watch-only wallet now requires an `accountKey`
   argument. This is to prevent bcoin from generating keys and addresses the
   user can not spend from.
-- `POST /wallet/:id/create` Now has a `sign` argument for optional signing
-  of transactions.
+- `POST /wallet/:id/create`
+  - Now has a `sign` argument for optional signing of transactions.
+  - Now has a `template` option, that will skip templating inputs when
+  `sign = false`, but you can enable it if necessary. It does not have an
+  effect when `sign = true`.
+  - Exposes `blocks`, which can will be used if there is no `rate` option.
+  - Exposes `sort` (Default `true`), that can be used to disable BIP69 sorting.
 
 #### RPC
 

lib/wallet/http.js

@@ -468,13 +468,16 @@ class HTTP extends Server {
 
       const options = {
         rate: valid.u64('rate'),
+        blocks: valid.u32('blocks'),
         maxFee: valid.u64('maxFee'),
         selection: valid.str('selection'),
         smart: valid.bool('smart'),
         account: valid.str('account'),
+        sort: valid.bool('sort'),
         subtractFee: valid.bool('subtractFee'),
         subtractIndex: valid.i32('subtractIndex'),
         depth: valid.u32(['confirmations', 'depth']),
+        template: valid.bool('template', sign),
         outputs: []
       };
 

lib/wallet/wallet.js

@@ -1236,6 +1236,9 @@ class Wallet extends EventEmitter {
    * to avoid sorting), set locktime, and template it.
    * @param {Object} options - See {@link Wallet#fund options}.
    * @param {Object[]} options.outputs - See {@link MTX#addOutput}.
+   * @param {Boolean} options.sort - Sort inputs and outputs (BIP69).
+   * @param {Boolean} options.template - Build scripts for inputs.
+   * @param {Number} options.locktime - TX locktime
    * @returns {Promise} - Returns {@link MTX}.
    */
 
@@ -1281,6 +1284,9 @@ class Wallet extends EventEmitter {
     assert(mtx.verifyInputs(this.wdb.state.height + 1),
       'TX failed context check.');
 
+    if (options.template === false)
+      return mtx;
+
     const total = await this.template(mtx);
 
     if (total === 0)

test/http-test.js

@@ -264,6 +264,72 @@ describe('HTTP', function() {
     });
   });
 
+  for (const template of [true, false]) {
+    const suffix = template ? 'with template' : 'without template';
+    it(`should create and sign transaction ${suffix}`, async () => {
+      const change = await wallet.createChange('default');
+      const tx = await wallet.createTX({
+        template: template, // should not matter, sign = true
+        sign: true,
+        outputs: [{
+          address: change.address,
+          value: 50000
+        }]
+      });
+      const mtx = MTX.fromJSON(tx);
+
+      for (const input of tx.inputs) {
+        const script = input.script;
+
+        assert.notStrictEqual(script, '',
+          'Input must be signed.');
+      }
+
+      assert.strictEqual(mtx.verify(), true,
+        'Transaction must be signed.');
+    });
+  }
+
+  it('should create transaction without template', async () => {
+    const change = await wallet.createChange('default');
+    const tx = await wallet.createTX({
+      sign: false,
+      outputs: [{
+        address: change.address,
+        value: 50000
+      }]
+    });
+
+    for (const input of tx.inputs) {
+      const script = input.script;
+
+      assert.strictEqual(script.length, 0,
+        'Input must not be templated.');
+    }
+  });
+
+  it('should create transaction with template', async () => {
+    const change = await wallet.createChange('default');
+    const tx = await wallet.createTX({
+      sign: false,
+      template: true,
+      outputs: [{
+        address: change.address,
+        value: 20000
+      }]
+    });
+
+    for (const input of tx.inputs) {
+      const script = Buffer.from(input.script, 'hex');
+
+      // p2pkh
+      // 1 (OP_0 placeholder) + 1 (length) + 33 (pubkey)
+      assert.strictEqual(script.length, 35);
+      assert.strictEqual(script[0], 0x00,
+        'First item in stack must be a placeholder OP_0');
+    }
+  });
+
   it('should cleanup', async () => {
     consensus.COINBASE_MATURITY = 100;
     await wallet.close();

test/wallet-test.js

@@ -1220,6 +1220,40 @@ describe('Wallet', function() {
     assert(t3.verify());
   });
 
+  for (const witness of [true, false]) {
+    it(`should create non-templated tx (witness=${witness})`, async () => {
+      const wallet = await wdb.create({ witness });
+
+      // Fund wallet
+      const t1 = new MTX();
+      t1.addInput(dummyInput());
+      t1.addOutput(await wallet.receiveAddress(), 500000);
+
+      await wdb.addTX(t1.toTX());
+
+      const options = {
+        rate: 10000,
+        round: true,
+        outputs: [{
+          address: await wallet.receiveAddress(),
+          value: 7000
+        }],
+        template: false
+      };
+
+      const t2 = await wallet.createTX(options);
+
+      assert(t2, 'Could not create tx.');
+
+      for (const input of t2.inputs) {
+        const {script, witness} = input;
+
+        assert.strictEqual(script.length, 0, 'Input is templated.');
+        assert.strictEqual(witness.length, 0, 'Input is templated.');
+      }
+    });
+  }
+
   it('should get range of txs', async () => {
     const wallet = currentWallet;
     const txs = await wallet.getRange(null, {