Print the Bitcoin address to the terminal as a QR code

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Printing the deposit address to the terminal as a QR code.
+  To not break automated scripts or integrations with other software, this behaviour is disabled if `--json` is passed to the application.
+
 ## [0.7.0] - 2021-05-28
 
 ### Fixed

Cargo.lock

@@ -486,6 +486,12 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3b5ca7a04898ad4bcd41c90c5285445ff5b791899bb1b0abdd2a2aa791211d7"
 
+[[package]]
+name = "bytemuck"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bed57e2090563b83ba8f83366628ce535a7584c9afa4c9fc0612a03925c6df58"
+
 [[package]]
 name = "byteorder"
 version = "1.4.3"
@@ -578,6 +584,12 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "checked_int_cast"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17cc5e6b5ab06331c33589842070416baa137e8b0eb912b008cfd4a78ada7919"
+
 [[package]]
 name = "chrono"
 version = "0.4.19"
@@ -624,6 +636,12 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "color_quant"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d7b894f5411737b7867f4827955924d7c254fc9f4d91a6aad6b097804b1018b"
+
 [[package]]
 name = "config"
 version = "0.11.0"
@@ -1560,6 +1578,20 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "image"
+version = "0.23.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24ffcb7e7244a9bf19d35bf2883b9c080c4ced3c07a9895572178cdb8f13f6a1"
+dependencies = [
+ "bytemuck",
+ "byteorder",
+ "color_quant",
+ "num-iter",
+ "num-rational 0.3.2",
+ "num-traits",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.6.2"
@@ -2372,7 +2404,7 @@ dependencies = [
  "num-complex",
  "num-integer",
  "num-iter",
- "num-rational",
+ "num-rational 0.1.42",
  "num-traits",
 ]
 
@@ -2431,6 +2463,17 @@ dependencies = [
  "rustc-serialize",
 ]
 
+[[package]]
+name = "num-rational"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12ac428b1cb17fce6f731001d307d351ec70a6d202fc2e60f7d4c5e42d8f4f07"
+dependencies = [
+ "autocfg 1.0.1",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.14"
@@ -2833,6 +2876,16 @@ dependencies = [
  "prost",
 ]
 
+[[package]]
+name = "qrcode"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16d2f1455f3630c6e5107b4f2b94e74d76dea80736de0981fd27644216cff57f"
+dependencies = [
+ "checked_int_cast",
+ "image",
+]
+
 [[package]]
 name = "quick-error"
 version = "1.2.3"
@@ -3913,6 +3966,7 @@ dependencies = [
  "port_check",
  "prettytable-rs",
  "proptest",
+ "qrcode",
  "rand 0.8.3",
  "rand_chacha 0.3.0",
  "reqwest",

swap/Cargo.toml

@@ -37,6 +37,7 @@ monero-rpc = { path = "../monero-rpc" }
 pem = "0.8"
 prettytable-rs = "0.8"
 proptest = "1"
+qrcode = "0.12"
 rand = "0.8"
 rand_chacha = "0.3"
 reqwest = { version = "0.11", features = [ "rustls-tls", "stream", "socks" ], default-features = false }

swap/src/bin/swap.rs

@@ -14,6 +14,8 @@
 
 use anyhow::{bail, Context, Result};
 use prettytable::{row, Table};
+use qrcode::render::unicode;
+use qrcode::QrCode;
 use std::cmp::min;
 use std::env;
 use std::future::Future;
@@ -101,6 +103,7 @@ async fn main() -> Result<()> {
 
             let max_givable = || bitcoin_wallet.max_giveable(TxLock::script_size());
             let (amount, fees) = determine_btc_to_swap(
+                json,
                 event_loop_handle.request_quote(),
                 bitcoin_wallet.new_address(),
                 || bitcoin_wallet.balance(),
@@ -325,7 +328,18 @@ async fn init_monero_wallet(
     Ok((monero_wallet, monero_wallet_rpc_process))
 }
 
+fn qr_code(value: &impl ToString) -> Result<String> {
+    let code = QrCode::new(value.to_string())?;
+    let qr_code = code
+        .render::<unicode::Dense1x2>()
+        .dark_color(unicode::Dense1x2::Light)
+        .light_color(unicode::Dense1x2::Dark)
+        .build();
+    Ok(qr_code)
+}
+
 async fn determine_btc_to_swap<FB, TB, FMG, TMG, FS, TS>(
+    json: bool,
     bid_quote: impl Future<Output = Result<BidQuote>>,
     get_new_address: impl Future<Output = Result<bitcoin::Address>>,
     balance: FB,
@@ -358,6 +372,10 @@ where
         let minimum_amount = bid_quote.min_quantity;
         let maximum_amount = bid_quote.max_quantity;
 
+        if !json {
+            eprintln!("{}", qr_code(&deposit_address)?);
+        }
+
         info!(
             %deposit_address,
             %current_maximum_giveable,
@@ -449,6 +467,7 @@ mod tests {
         ])));
 
         let (amount, fees) = determine_btc_to_swap(
+            true,
             async { Ok(quote_with_max(0.01)) },
             get_dummy_address(),
             || async { Ok(Amount::from_btc(0.001)?) },
@@ -475,6 +494,7 @@ mod tests {
         ])));
 
         let (amount, fees) = determine_btc_to_swap(
+            true,
             async { Ok(quote_with_max(0.01)) },
             get_dummy_address(),
             || async { Ok(Amount::from_btc(0.1001)?) },
@@ -502,6 +522,7 @@ mod tests {
         ])));
 
         let (amount, fees) = determine_btc_to_swap(
+            true,
             async { Ok(quote_with_max(0.01)) },
             async { panic!("should not request new address when initial balance  is > 0") },
             || async { Ok(Amount::from_btc(0.005)?) },
@@ -529,6 +550,7 @@ mod tests {
         ])));
 
         let (amount, fees) = determine_btc_to_swap(
+            true,
             async { Ok(quote_with_max(0.01)) },
             async { panic!("should not request new address when initial balance is > 0") },
             || async { Ok(Amount::from_btc(0.1001)?) },
@@ -556,6 +578,7 @@ mod tests {
         ])));
 
         let (amount, fees) = determine_btc_to_swap(
+            true,
             async { Ok(quote_with_min(0.01)) },
             get_dummy_address(),
             || async { Ok(Amount::from_btc(0.0101)?) },
@@ -583,6 +606,7 @@ mod tests {
         ])));
 
         let (amount, fees) = determine_btc_to_swap(
+            true,
             async { Ok(quote_with_min(0.01)) },
             get_dummy_address(),
             || async { Ok(Amount::from_btc(0.0101)?) },
@@ -615,6 +639,7 @@ mod tests {
         let error = tokio::time::timeout(
             Duration::from_secs(1),
             determine_btc_to_swap(
+                true,
                 async { Ok(quote_with_min(0.1)) },
                 get_dummy_address(),
                 || async { Ok(Amount::from_btc(0.0101)?) },