Merge #560: cleanup examples

288a6f1 examples: taproot: Use turbofish syntax (Tobin C. Harding)
d981a95 examples: taproot: Do minor docs cleanup (Tobin C. Harding)
b1ce6cd examples: Clean up import statements (Tobin C. Harding)
93ef502 examples: Remove base64 dev dependency (Tobin C. Harding)
e83c09c Move bip-174 test out of examples and into tests (Tobin C. Harding)
a836bcb examples: Use SPDX licence identifiers (Tobin C. Harding)
a797fcc examples: htlc: Fix doc typos (Tobin C. Harding)

Pull request description:

  Nothing too crazy here, just a few cleanups to the `examples` directory. Note though that commit `122be5d Move bip-174 test out of examples and into tests` moves a file out of `examples` and into a new `tests` directory.

ACKs for top commit:
  sanket1729:
    ACK 288a6f1
  apoelstra:
    ACK 288a6f1

Tree-SHA512: 736011c63ab6d929f9a76c1ebead1afdd5fbc9b3325844acde1dda980170e0b0dd1eb8c26dc7dcae9409e6ebdef10b43efcf8d322f04b77851e3910027f3e96e

Author: apoelstra

Cargo.toml

@@ -34,7 +34,6 @@ actual-serde = { package = "serde", version = "1.0.103", optional = true }
 serde_test = "1.0.147"
 bitcoin = { version = "0.30.0", features = ["base64"] }
 secp256k1 = {version = "0.27.0", features = ["rand-std"]}
-actual-base64 = { package = "base64", version = "0.13.0" }
 
 [[example]]
 name = "htlc"
@@ -52,10 +51,6 @@ required-features = ["std"]
 name = "verify_tx"
 required-features = ["std"]
 
-[[example]]
-name = "psbt"
-required-features = ["std"]
-
 [[example]]
 name = "xpub_descriptors"
 required-features = ["std"]

contrib/test.sh

@@ -58,7 +58,6 @@ then
     cargo run --example parse
     cargo run --example sign_multisig
     cargo run --example verify_tx > /dev/null
-    cargo run --example psbt
     cargo run --example xpub_descriptors
     cargo run --example taproot --features=compiler
     cargo run --example psbt_sign_finalize --features=base64

examples/htlc.rs

@@ -1,22 +1,11 @@
-// Miniscript
-// Written in 2019 by
-//    Thomas Eizinger <[email protected]>
-//
-// To the extent possible under law, the author(s) have dedicated all
-// copyright and related and neighboring rights to this software to
-// the public domain worldwide. This software is distributed without
-// any warranty.
-//
-// You should have received a copy of the CC0 Public Domain Dedication
-// along with this software.
-// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
-//
+// Written by Thomas Eizinger <[email protected]>
+// SPDX-License-Identifier: CC0-1.0
 
 //! Example: Create an HTLC with miniscript using the policy compiler
 
 use std::str::FromStr;
 
-use bitcoin::Network;
+use miniscript::bitcoin::Network;
 use miniscript::descriptor::Wsh;
 use miniscript::policy::{Concrete, Liftable};
 
@@ -51,7 +40,7 @@ fn main() {
         "or(and(pk(022222222222222222222222222222222222222222222222222222222222222222),sha256(1111111111111111111111111111111111111111111111111111111111111111)),and(pk(020202020202020202020202020202020202020202020202020202020202020202),older(4444)))"
     );
 
-    // Get the scriptPpubkey for this Wsh descriptor.
+    // Get the scriptPubkey for this Wsh descriptor.
     assert_eq!(
         format!("{:x}", htlc_descriptor.script_pubkey()),
         "0020d853877af928a8d2a569c9c0ed14bd16f6a80ce9cccaf8a6150fd8f7f8867ae2"
@@ -63,7 +52,7 @@ fn main() {
         "21022222222222222222222222222222222222222222222222222222222222222222ac6476a91451814f108670aced2d77c1805ddd6634bc9d473188ad025c11b26782012088a82011111111111111111111111111111111111111111111111111111111111111118768"
     );
 
-    // Get the address for this Wsh descriptor.v
+    // Get the address for this Wsh descriptor.
     assert_eq!(
         format!("{}", htlc_descriptor.address(Network::Bitcoin)),
         "bc1qmpfcw7he9z5d9ftfe8qw699azmm2sr8fen903fs4plv007yx0t3qxfmqv5"

examples/parse.rs

@@ -1,16 +1,4 @@
-// Miniscript
-// Written in 2019 by
-//     Andrew Poelstra <[email protected]>
-//
-// To the extent possible under law, the author(s) have dedicated all
-// copyright and related and neighboring rights to this software to
-// the public domain worldwide. This software is distributed without
-// any warranty.
-//
-// You should have received a copy of the CC0 Public Domain Dedication
-// along with this software.
-// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
-//
+// SPDX-License-Identifier: CC0-1.0
 
 //! Example: Parsing a descriptor from a string.
 

examples/psbt_sign_finalize.rs

@@ -1,14 +1,15 @@
+// SPDX-License-Identifier: CC0-1.0
+
 use std::collections::BTreeMap;
 use std::str::FromStr;
 
-use actual_base64 as base64;
-use bitcoin::sighash::SighashCache;
-use bitcoin::PrivateKey;
 use miniscript::bitcoin::consensus::encode::deserialize;
 use miniscript::bitcoin::hashes::hex::FromHex;
-use miniscript::bitcoin::psbt::PartiallySignedTransaction as Psbt;
+use miniscript::bitcoin::psbt::{self, Psbt};
+use miniscript::bitcoin::sighash::SighashCache;
 use miniscript::bitcoin::{
-    self, psbt, secp256k1, Address, Network, OutPoint, Script, Sequence, Transaction, TxIn, TxOut,
+    self, base64, secp256k1, Address, Network, OutPoint, PrivateKey, Script, Sequence, Transaction,
+    TxIn, TxOut,
 };
 use miniscript::psbt::{PsbtExt, PsbtInputExt};
 use miniscript::Descriptor;

examples/sign_multisig.rs

@@ -1,16 +1,4 @@
-// Miniscript
-// Written in 2019 by
-//     Andrew Poelstra <[email protected]>
-//
-// To the extent possible under law, the author(s) have dedicated all
-// copyright and related and neighboring rights to this software to
-// the public domain worldwide. This software is distributed without
-// any warranty.
-//
-// You should have received a copy of the CC0 Public Domain Dedication
-// along with this software.
-// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
-//
+// SPDX-License-Identifier: CC0-1.0
 
 //! Example: Signing a 2-of-3 multisignature.
 

examples/taproot.rs

@@ -1,10 +1,12 @@
+// SPDX-License-Identifier: CC0-1.0
+
 use std::collections::HashMap;
 use std::str::FromStr;
 
-use bitcoin::address::WitnessVersion;
-use bitcoin::key::XOnlyPublicKey;
-use bitcoin::secp256k1::{rand, KeyPair};
-use bitcoin::Network;
+use miniscript::bitcoin::address::WitnessVersion;
+use miniscript::bitcoin::key::{KeyPair, XOnlyPublicKey};
+use miniscript::bitcoin::secp256k1::rand;
+use miniscript::bitcoin::Network;
 use miniscript::descriptor::DescriptorType;
 use miniscript::policy::Concrete;
 use miniscript::{translate_hash_fail, Descriptor, Miniscript, Tap, TranslatePk, Translator};
@@ -21,9 +23,8 @@ impl Translator<String, XOnlyPublicKey, ()> for StrPkTranslator {
         self.pk_map.get(pk).copied().ok_or(())
     }
 
-    // We don't need to implement these methods as we are not using them in the policy
-    // Fail if we encounter any hash fragments.
-    // See also translate_hash_clone! macro
+    // We don't need to implement these methods as we are not using them in the policy.
+    // Fail if we encounter any hash fragments. See also translate_hash_clone! macro.
     translate_hash_fail!(String, XOnlyPublicKey, ());
 }
 
@@ -39,7 +40,7 @@ fn main() {
     .replace(&[' ', '\n', '\t'][..], "");
 
     let _ms = Miniscript::<String, Tap>::from_str("and_v(v:ripemd160(H),pk(A))").unwrap();
-    let pol: Concrete<String> = Concrete::from_str(&pol_str).unwrap();
+    let pol = Concrete::<String>::from_str(&pol_str).unwrap();
     // In case we can't find an internal key for the given policy, we set the internal key to
     // a random pubkey as specified by BIP341 (which are *unspendable* by any party :p)
     let desc = pol.compile_tr(Some("UNSPENDABLE_KEY".to_string())).unwrap();
@@ -52,7 +53,7 @@ fn main() {
     // Check whether the descriptors are safe.
     assert!(desc.sanity_check().is_ok());
 
-    // Descriptor Type and Version should match respectively for Taproot
+    // Descriptor type and version should match respectively for taproot
     let desc_type = desc.desc_type();
     assert_eq!(desc_type, DescriptorType::Tr);
     assert_eq!(desc_type.segwit_version().unwrap(), WitnessVersion::V1);
@@ -99,11 +100,12 @@ fn main() {
 
     let real_desc = desc.translate_pk(&mut t).unwrap();
 
-    // Max Satisfaction Weight for compilation, corresponding to the script-path spend
-    // `multi_a(2,PUBKEY_1,PUBKEY_2) at taptree depth 1, having
-    // Max Witness Size = varint(control_block_size) + control_block size +
-    //                    varint(script_size) + script_size + max_satisfaction_size
-    //                  = 1 + 65 + 1 + 70 + 132 = 269
+    // Max satisfaction weight for compilation, corresponding to the script-path spend
+    // `multi_a(2,PUBKEY_1,PUBKEY_2) at taptree depth 1, having:
+    //
+    //     max_witness_size = varint(control_block_size) + control_block size +
+    //                        varint(script_size) + script_size + max_satisfaction_size
+    //                      = 1 + 65 + 1 + 70 + 132 = 269
     let max_sat_wt = real_desc.max_weight_to_satisfy().unwrap();
     assert_eq!(max_sat_wt, 269);
 

examples/verify_tx.rs

@@ -1,24 +1,12 @@
-// Miniscript
-// Written in 2019 by
-//     Andrew Poelstra <[email protected]>
-//
-// To the extent possible under law, the author(s) have dedicated all
-// copyright and related and neighboring rights to this software to
-// the public domain worldwide. This software is distributed without
-// any warranty.
-//
-// You should have received a copy of the CC0 Public Domain Dedication
-// along with this software.
-// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
-//
+// SPDX-License-Identifier: CC0-1.0
 
 //! Example: Verifying a signed transaction.
 
 use std::str::FromStr;
 
-use bitcoin::consensus::Decodable;
-use bitcoin::secp256k1::{self, Secp256k1};
-use bitcoin::{absolute, sighash, Sequence};
+use miniscript::bitcoin::consensus::Decodable;
+use miniscript::bitcoin::secp256k1::{self, Secp256k1};
+use miniscript::bitcoin::{absolute, sighash, Sequence};
 use miniscript::interpreter::KeySigPair;
 
 fn main() {

examples/xpub_descriptors.rs

@@ -1,16 +1,4 @@
-// Miniscript
-// Written in 2019 by
-//     Andrew Poelstra <[email protected]>
-//
-// To the extent possible under law, the author(s) have dedicated all
-// copyright and related and neighboring rights to this software to
-// the public domain worldwide. This software is distributed without
-// any warranty.
-//
-// You should have received a copy of the CC0 Public Domain Dedication
-// along with this software.
-// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
-//
+// SPDX-License-Identifier: CC0-1.0
 
 //! Example: Parsing a xpub and getting an address.
 

examples/psbt.rs renamed to tests/bip-174.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: CC0-1.0
+
 use bitcoin::consensus::encode::deserialize;
 use bitcoin::hashes::hex::FromHex;
 use bitcoin::psbt::Psbt;