From aa93a829043e7279ab4c7ab4411446834c8ab732 Mon Sep 17 00:00:00 2001
From: Alekos Filini <alekos.filini@gmail.com>
Date: Wed, 29 Apr 2020 11:52:45 +0200
Subject: [PATCH] Add a miniscript compiler CLI

---
 Cargo.toml           |   7 +++
 examples/compiler.rs | 110 +++++++++++++++++++++++++++++++++++++++++++
 src/lib.rs           |   2 +-
 src/wallet/mod.rs    |   2 +
 4 files changed, 120 insertions(+), 1 deletion(-)
 create mode 100644 examples/compiler.rs

diff --git a/Cargo.toml b/Cargo.toml
index d185ad9f..0edd8c32 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,6 +17,7 @@ electrum-client = { version = "0.1.0-beta.5", optional = true }
 
 [features]
 minimal = []
+compiler = ["miniscript/compiler"]
 default = ["sled", "electrum-client"]
 electrum = ["electrum-client"]
 key-value-db = ["sled"]
@@ -27,6 +28,7 @@ rustyline = "5.0" # newer version requires 2018 edition
 clap = "2.33"
 dirs = "2.0"
 env_logger = "0.7"
+rand = "0.7"
 
 [[example]]
 name = "repl"
@@ -35,6 +37,11 @@ name = "psbt"
 [[example]]
 name = "parse_descriptor"
 
+[[example]]
+name = "miniscriptc"
+path = "examples/compiler.rs"
+required-features = ["compiler"]
+
 # Provide a more user-friendly alias for the REPL
 [[example]]
 name = "magic"
diff --git a/examples/compiler.rs b/examples/compiler.rs
new file mode 100644
index 00000000..09cad948
--- /dev/null
+++ b/examples/compiler.rs
@@ -0,0 +1,110 @@
+extern crate bitcoin;
+extern crate clap;
+extern crate log;
+extern crate magical_bitcoin_wallet;
+extern crate miniscript;
+extern crate rand;
+extern crate serde_json;
+extern crate sled;
+
+use std::str::FromStr;
+
+use log::info;
+
+use rand::distributions::Alphanumeric;
+use rand::{thread_rng, Rng};
+
+use clap::{App, Arg};
+
+use bitcoin::Network;
+use miniscript::policy::Concrete;
+use miniscript::Descriptor;
+
+use magical_bitcoin_wallet::types::ScriptType;
+use magical_bitcoin_wallet::{OfflineWallet, Wallet};
+
+fn main() {
+    env_logger::init_from_env(
+        env_logger::Env::default().filter_or(env_logger::DEFAULT_FILTER_ENV, "info"),
+    );
+
+    let matches = App::new("Miniscript Compiler")
+        .arg(
+            Arg::with_name("POLICY")
+                .help("Sets the spending policy to compile")
+                .required(true)
+                .index(1),
+        )
+        .arg(
+            Arg::with_name("TYPE")
+                .help("Sets the script type used to embed the compiled policy")
+                .required(true)
+                .index(2)
+                .possible_values(&["sh", "wsh", "sh-wsh"]),
+        )
+        .arg(
+            Arg::with_name("parsed_policy")
+                .long("parsed_policy")
+                .short("p")
+                .help("Also return the parsed spending policy in JSON format"),
+        )
+        .arg(
+            Arg::with_name("network")
+                .short("n")
+                .long("network")
+                .help("Sets the network")
+                .takes_value(true)
+                .default_value("testnet")
+                .possible_values(&["testnet", "regtest"]),
+        )
+        .get_matches();
+
+    let policy_str = matches.value_of("POLICY").unwrap();
+    info!("Compiling policy: {}", policy_str);
+
+    let policy = Concrete::<String>::from_str(&policy_str).unwrap();
+    let compiled = policy.compile().unwrap();
+
+    let descriptor = match matches.value_of("TYPE").unwrap() {
+        "sh" => Descriptor::Sh(compiled),
+        "wsh" => Descriptor::Wsh(compiled),
+        "sh-wsh" => Descriptor::ShWsh(compiled),
+        _ => panic!("Invalid type"),
+    };
+
+    info!("... Descriptor: {}", descriptor);
+
+    let temp_db = {
+        let mut temp_db = std::env::temp_dir();
+        let rand_string: String = thread_rng().sample_iter(&Alphanumeric).take(15).collect();
+        temp_db.push(rand_string);
+
+        let database = sled::open(&temp_db).unwrap();
+
+        let network = match matches.value_of("network") {
+            Some("regtest") => Network::Regtest,
+            Some("testnet") | _ => Network::Testnet,
+        };
+        let wallet: OfflineWallet<_> = Wallet::new_offline(
+            &format!("{}", descriptor),
+            None,
+            network,
+            database.open_tree("").unwrap(),
+        )
+        .unwrap();
+
+        info!("... First address: {}", wallet.get_new_address().unwrap());
+
+        if matches.is_present("parsed_policy") {
+            let spending_policy = wallet.policies(ScriptType::External).unwrap();
+            info!(
+                "... Spending policy:\n{}",
+                serde_json::to_string_pretty(&spending_policy).unwrap()
+            );
+        }
+
+        temp_db
+    };
+
+    std::fs::remove_dir_all(temp_db).unwrap();
+}
diff --git a/src/lib.rs b/src/lib.rs
index 2553d1ad..2d122d98 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -26,4 +26,4 @@ pub mod types;
 pub mod wallet;
 
 pub use descriptor::ExtendedDescriptor;
-pub use wallet::Wallet;
+pub use wallet::{OfflineWallet, Wallet};
diff --git a/src/wallet/mod.rs b/src/wallet/mod.rs
index 048e5153..871d09ed 100644
--- a/src/wallet/mod.rs
+++ b/src/wallet/mod.rs
@@ -23,6 +23,8 @@ use log::{debug, error, info, trace};
 pub mod offline_stream;
 pub mod utils;
 
+pub type OfflineWallet<D> = Wallet<offline_stream::OfflineStream, D>;
+
 use self::utils::{ChunksIterator, IsDust};
 use crate::database::{BatchDatabase, BatchOperations};
 use crate::descriptor::{get_checksum, DescriptorMeta, ExtendedDescriptor, ExtractPolicy, Policy};