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zcash-android-wallet-sdk
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zcash-android-wallet-sdk/backend-lib/src/main/rust/lib.rs

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use std::collections::HashMap;
use std::convert::{TryFrom, TryInto};
use std::panic;
use std::path::Path;
use std::ptr;
use failure::format_err;
use jni::objects::{JObject, JValue};
use jni::{
objects::{JClass, JString},
sys::{jboolean, jbyteArray, jint, jlong, jobject, jobjectArray, jstring, JNI_FALSE, JNI_TRUE},
JNIEnv,
};
use schemer::MigratorError;
use secrecy::{ExposeSecret, SecretVec};
use tracing::{debug, error};
use tracing_subscriber::prelude::*;
use tracing_subscriber::reload;
use zcash_address::{ToAddress, ZcashAddress};
use zcash_client_backend::keys::{DecodingError, UnifiedSpendingKey};
use zcash_client_backend::{
address::{RecipientAddress, UnifiedAddress},
data_api::{
chain::{self, scan_cached_blocks, validate_chain},
wallet::{
decrypt_and_store_transaction, input_selection::GreedyInputSelector,
shield_transparent_funds, spend,
},
WalletRead, WalletWrite,
},
encoding::AddressCodec,
fees::DustOutputPolicy,
keys::{Era, UnifiedFullViewingKey},
wallet::{OvkPolicy, WalletTransparentOutput},
zip321::{Payment, TransactionRequest},
};
use zcash_client_sqlite::chain::init::init_blockmeta_db;
use zcash_client_sqlite::{
chain::BlockMeta,
wallet::init::{init_accounts_table, init_blocks_table, init_wallet_db, WalletMigrationError},
FsBlockDb, NoteId, WalletDb,
};
use zcash_primitives::consensus::Network::{MainNetwork, TestNetwork};
use zcash_primitives::{
block::BlockHash,
consensus::{BlockHeight, BranchId, Network, Parameters},
legacy::{Script, TransparentAddress},
memo::{Memo, MemoBytes},
transaction::{
components::{amount::NonNegativeAmount, Amount, OutPoint, TxOut},
Transaction,
},
zip32::{AccountId, DiversifierIndex},
};
use zcash_proofs::prover::LocalTxProver;
use crate::utils::exception::unwrap_exc_or;
mod utils;
// Combine imports into common namespaces.
mod fixed {
pub(super) use zcash_client_backend::fees::fixed::*;
pub(super) use zcash_primitives::transaction::fees::fixed::*;
}
mod zip317 {
pub(super) use zcash_client_backend::fees::zip317::*;
pub(super) use zcash_primitives::transaction::fees::zip317::*;
}
const ANCHOR_OFFSET: u32 = 10;
#[cfg(debug_assertions)]
fn print_debug_state() {
debug!("WARNING! Debugging enabled! This will likely slow things down 10X!");
}
#[cfg(not(debug_assertions))]
fn print_debug_state() {
debug!("Release enabled (congrats, this is NOT a debug build).");
}
fn wallet_db<P: Parameters>(
env: &JNIEnv<'_>,
params: P,
db_data: JString<'_>,
) -> Result<WalletDb<P>, failure::Error> {
WalletDb::for_path(utils::java_string_to_rust(&env, db_data), params)
.map_err(|e| format_err!("Error opening wallet database connection: {}", e))
}
fn block_db(env: &JNIEnv<'_>, fsblockdb_root: JString<'_>) -> Result<FsBlockDb, failure::Error> {
FsBlockDb::for_path(utils::java_string_to_rust(&env, fsblockdb_root))
.map_err(|e| format_err!("Error opening block source database connection: {:?}", e))
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_initOnLoad(
_env: JNIEnv<'_>,
_: JClass<'_>,
) {
// Set up the Android tracing layer.
#[cfg(target_os = "android")]
let android_layer = paranoid_android::layer("cash.z.rust.logs")
.with_ansi(false)
.with_filter(tracing_subscriber::filter::LevelFilter::INFO);
// Generate Android trace events from `tracing` spans.
let (trace_event_layer, reload_handle) = reload::Layer::new(utils::trace::Layer::new(None));
// Install the `tracing` subscriber.
let registry = tracing_subscriber::registry();
#[cfg(target_os = "android")]
let registry = registry.with(android_layer);
registry.with(trace_event_layer).init();
// Log panics instead of writing them to stderr.
log_panics::init();
// Load optional NDK APIs. We do this via a reload so that we can capture any errors
// that occur while trying to dynamically load the NDK.
if let Err(e) = reload_handle.modify(|layer| match utils::target_ndk::load() {
Ok(api) => *layer = utils::trace::Layer::new(Some(api)),
Err(e) => error!("Could not open NDK library or load symbols: {}", e),
}) {
error!("Failed to reload tracing subscriber with NDK APIs: {}", e);
}
debug!("logs have been initialized successfully");
print_debug_state();
}
/// Sets up the internal structure of the blockmeta database.
///
/// Returns 0 if successful, or -1 otherwise.
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_initBlockMetaDb(
env: JNIEnv<'_>,
_: JClass<'_>,
fsblockdb_root: JString<'_>,
) -> jint {
let res = panic::catch_unwind(|| {
let mut db_meta = block_db(&env, fsblockdb_root)?;
match init_blockmeta_db(&mut db_meta) {
Ok(()) => Ok(0),
Err(e) => Err(format_err!(
"Error while initializing block metadata DB: {}",
e
)),
}
});
unwrap_exc_or(&env, res, -1)
}
/// Sets up the internal structure of the data database.
///
/// If `seed` is `null`, database migrations will be attempted without it.
///
/// Returns 0 if successful, 1 if the seed must be provided in order to execute the requested
/// migrations, or -1 otherwise.
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_initDataDb(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
seed: jbyteArray,
network_id: jint,
) -> jint {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_path = utils::java_string_to_rust(&env, db_data);
let mut db_data = WalletDb::for_path(db_path, network)
.map_err(|e| format_err!("Error while opening data DB: {}", e))?;
let seed = (!seed.is_null()).then(|| SecretVec::new(env.convert_byte_array(seed).unwrap()));
match init_wallet_db(&mut db_data, seed) {
Ok(()) => Ok(0),
Err(MigratorError::Migration { error, .. })
if matches!(error, WalletMigrationError::SeedRequired) =>
{
Ok(1)
}
Err(e) => Err(format_err!("Error while initializing data DB: {}", e)),
}
});
unwrap_exc_or(&env, res, -1)
}
fn encode_usk(
env: &JNIEnv<'_>,
account: AccountId,
usk: UnifiedSpendingKey,
) -> Result<jobject, failure::Error> {
let encoded = SecretVec::new(usk.to_bytes(Era::Orchard));
let bytes = env.byte_array_from_slice(encoded.expose_secret())?;
let output = env.new_object(
"cash/z/ecc/android/sdk/internal/model/JniUnifiedSpendingKey",
"(I[B)V",
&[
JValue::Int(u32::from(account) as i32),
JValue::Object(unsafe { JObject::from_raw(bytes) }),
],
)?;
Ok(output.into_raw())
}
fn decode_usk(env: &JNIEnv<'_>, usk: jbyteArray) -> Result<UnifiedSpendingKey, failure::Error> {
let usk_bytes = SecretVec::new(env.convert_byte_array(usk).unwrap());
// The remainder of the function is safe.
UnifiedSpendingKey::from_bytes(Era::Orchard, usk_bytes.expose_secret()).map_err(|e| match e {
DecodingError::EraMismatch(era) => format_err!(
"Spending key was from era {:?}, but {:?} was expected.",
era,
Era::Orchard
),
e => format_err!(
"An error occurred decoding the provided unified spending key: {:?}",
e
),
})
}
/// Adds the next available account-level spend authority, given the current set of
/// [ZIP 316] account identifiers known, to the wallet database.
///
/// Returns the newly created [ZIP 316] account identifier, along with the binary encoding
/// of the [`UnifiedSpendingKey`] for the newly created account. The caller should store
/// the returned spending key in a secure fashion.
///
/// If `seed` was imported from a backup and this method is being used to restore a
/// previous wallet state, you should use this method to add all of the desired
/// accounts before scanning the chain from the seed's birthday height.
///
/// By convention, wallets should only allow a new account to be generated after funds
/// have been received by the currently-available account (in order to enable
/// automated account recovery).
///
/// [ZIP 316]: https://zips.z.cash/zip-0316
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_createAccount(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
seed: jbyteArray,
network_id: jint,
) -> jobject {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let seed = SecretVec::new(env.convert_byte_array(seed).unwrap());
let mut db_ops = db_data.get_update_ops()?;
let (account, usk) = db_ops
.create_account(&seed)
.map_err(|e| format_err!("Error while initializing accounts: {}", e))?;
encode_usk(&env, account, usk)
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
/// Initialises the data database with the given set of unified full viewing keys.
///
/// This should only be used in special cases for implementing wallet recovery; prefer
/// `RustBackend.createAccount` for normal account creation purposes.
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_initAccountsTableWithKeys(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
ufvks_arr: jobjectArray,
network_id: jint,
) -> jboolean {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
// TODO: avoid all this unwrapping and also surface errors, better
let count = env.get_array_length(ufvks_arr).unwrap();
let ufvks = (0..count)
.map(|i| env.get_object_array_element(ufvks_arr, i))
.map(|jstr| utils::java_string_to_rust(&env, jstr.unwrap().into()))
.map(|ufvkstr| {
UnifiedFullViewingKey::decode(&network, &ufvkstr).map_err(|e| {
if e.starts_with("UFVK is for network") {
let (network_name, other) = if network == TestNetwork {
("testnet", "mainnet")
} else {
("mainnet", "testnet")
};
format_err!("Error: Wrong network! Unable to decode viewing key for {}. Check whether this is a key for {}.", network_name, other)
} else {
format_err!("Invalid Unified Full Viewing Key: {}", e)
}
})
})
.enumerate() // TODO: Pass account IDs across the FFI.
.map(|(i, res)| res.map(|ufvk| (AccountId::from(i as u32), ufvk)))
.collect::<Result<HashMap<_,_>, _>>()?;
match init_accounts_table(&db_data, &ufvks) {
Ok(()) => Ok(JNI_TRUE),
Err(e) => Err(format_err!("Error while initializing accounts: {}", e)),
}
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
/// Derives and returns a unified spending key from the given seed for the given account ID.
///
/// Returns the newly created [ZIP 316] account identifier, along with the binary encoding
/// of the [`UnifiedSpendingKey`] for the newly created account. The caller should store
/// the returned spending key in a secure fashion.
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustDerivationTool_deriveSpendingKey(
env: JNIEnv<'_>,
_: JClass<'_>,
seed: jbyteArray,
account: jint,
network_id: jint,
) -> jobject {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let seed = SecretVec::new(env.convert_byte_array(seed).unwrap());
let account = if account >= 0 {
AccountId::from(account as u32)
} else {
return Err(format_err!("accounts argument must be greater than zero"));
};
let usk = UnifiedSpendingKey::from_seed(&network, seed.expose_secret(), account)
.map_err(|e| format_err!("error generating unified spending key from seed: {:?}", e))?;
encode_usk(&env, account, usk)
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustDerivationTool_deriveUnifiedFullViewingKeysFromSeed(
env: JNIEnv<'_>,
_: JClass<'_>,
seed: jbyteArray,
accounts: jint,
network_id: jint,
) -> jobjectArray {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let seed = env.convert_byte_array(seed).unwrap();
let accounts = if accounts > 0 {
accounts as u32
} else {
return Err(format_err!("accounts argument must be greater than zero"));
};
let ufvks: Vec<_> = (0..accounts)
.map(|account| {
let account_id = AccountId::from(account);
UnifiedSpendingKey::from_seed(&network, &seed, account_id)
.map_err(|e| {
format_err!("error generating unified spending key from seed: {:?}", e)
})
.map(|usk| usk.to_unified_full_viewing_key().encode(&network))
})
.collect::<Result<_, _>>()?;
Ok(utils::rust_vec_to_java(
&env,
ufvks,
"java/lang/String",
|env, ufvk| env.new_string(ufvk),
|env| env.new_string(""),
))
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustDerivationTool_deriveUnifiedAddressFromSeed(
env: JNIEnv<'_>,
_: JClass<'_>,
seed: jbyteArray,
account_index: jint,
network_id: jint,
) -> jstring {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let seed = env.convert_byte_array(seed).unwrap();
let account_index = if account_index >= 0 {
account_index as u32
} else {
return Err(format_err!("accountIndex argument must be nonnegative"));
};
let account_id = AccountId::from(account_index);
let ufvk = UnifiedSpendingKey::from_seed(&network, &seed, account_id)
.map_err(|e| format_err!("error generating unified spending key from seed: {:?}", e))
.map(|usk| usk.to_unified_full_viewing_key())?;
let (ua, _) = ufvk
.find_address(DiversifierIndex::new())
.expect("At least one Unified Address should be derivable");
let address_str = ua.encode(&network);
let output = env
.new_string(address_str)
.expect("Couldn't create Java string!");
Ok(output.into_raw())
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustDerivationTool_deriveUnifiedAddressFromViewingKey(
env: JNIEnv<'_>,
_: JClass<'_>,
ufvk_string: JString<'_>,
network_id: jint,
) -> jstring {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let ufvk_string = utils::java_string_to_rust(&env, ufvk_string);
let ufvk = match UnifiedFullViewingKey::decode(&network, &ufvk_string) {
Ok(ufvk) => ufvk,
Err(e) => {
return Err(format_err!(
"Error while deriving viewing key from string input: {}",
e,
));
}
};
// Derive the default Unified Address (containing the default Sapling payment
// address that older SDKs used).
let (ua, _) = ufvk.default_address();
let address_str = ua.encode(&network);
let output = env
.new_string(address_str)
.expect("Couldn't create Java string!");
Ok(output.into_raw())
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustDerivationTool_deriveUnifiedFullViewingKey(
env: JNIEnv<'_>,
_: JClass<'_>,
usk: jbyteArray,
network_id: jint,
) -> jstring {
let res = panic::catch_unwind(|| {
let usk = decode_usk(&env, usk)?;
let network = parse_network(network_id as u32)?;
let ufvk = usk.to_unified_full_viewing_key();
let output = env
.new_string(ufvk.encode(&network))
.expect("Couldn't create Java string!");
Ok(output.into_raw())
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_initBlocksTable(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
height: jlong,
hash_string: JString<'_>,
time: jlong,
sapling_tree_string: JString<'_>,
network_id: jint,
) -> jboolean {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let hash = {
let mut hash = hex::decode(utils::java_string_to_rust(&env, hash_string)).unwrap();
hash.reverse();
BlockHash::from_slice(&hash)
};
let time = if time >= 0 && time <= jlong::from(u32::max_value()) {
time as u32
} else {
return Err(format_err!("time argument must fit in a u32"));
};
let sapling_tree =
hex::decode(utils::java_string_to_rust(&env, sapling_tree_string)).unwrap();
debug!("initializing blocks table with height {}", height);
match init_blocks_table(
&db_data,
(height as u32).try_into()?,
hash,
time,
&sapling_tree,
) {
Ok(()) => Ok(JNI_TRUE),
Err(e) => Err(format_err!("Error while initializing blocks table: {}", e)),
}
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getCurrentAddress(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
account: jint,
network_id: jint,
) -> jstring {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let account = AccountId::from(u32::try_from(account)?);
match (&db_data).get_current_address(account) {
Ok(Some(addr)) => {
let addr_str = addr.encode(&network);
let output = env
.new_string(addr_str)
.expect("Couldn't create Java string!");
Ok(output.into_raw())
}
Ok(None) => Err(format_err!("{:?} is not known to the wallet", account)),
Err(e) => Err(format_err!("Error while fetching address: {}", e)),
}
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
struct UnifiedAddressParser(UnifiedAddress);
impl zcash_address::TryFromRawAddress for UnifiedAddressParser {
type Error = failure::Error;
fn try_from_raw_unified(
data: zcash_address::unified::Address,
) -> Result<Self, zcash_address::ConversionError<Self::Error>> {
data.try_into()
.map(UnifiedAddressParser)
.map_err(|e| format_err!("Invalid Unified Address: {}", e).into())
}
}
/// Returns the transparent receiver within the given Unified Address, if any.
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getTransparentReceiverForUnifiedAddress(
env: JNIEnv<'_>,
_: JClass<'_>,
ua: JString<'_>,
) -> jstring {
let res = panic::catch_unwind(|| {
let ua_str = utils::java_string_to_rust(&env, ua);
let (network, ua) = match ZcashAddress::try_from_encoded(&ua_str) {
Ok(addr) => addr
.convert::<(_, UnifiedAddressParser)>()
.map_err(|e| format_err!("Not a Unified Address: {}", e)),
Err(e) => return Err(format_err!("Invalid Zcash address: {}", e)),
}?;
if let Some(taddr) = ua.0.transparent() {
let taddr = match taddr {
TransparentAddress::PublicKey(data) => {
ZcashAddress::from_transparent_p2pkh(network, *data)
}
TransparentAddress::Script(data) => {
ZcashAddress::from_transparent_p2sh(network, *data)
}
};
let output = env
.new_string(taddr.encode())
.expect("Couldn't create Java string!");
Ok(output.into_raw())
} else {
Err(format_err!(
"Unified Address doesn't contain a transparent receiver"
))
}
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
/// Returns the Sapling receiver within the given Unified Address, if any.
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getSaplingReceiverForUnifiedAddress(
env: JNIEnv<'_>,
_: JClass<'_>,
ua: JString<'_>,
) -> jstring {
let res = panic::catch_unwind(|| {
let ua_str = utils::java_string_to_rust(&env, ua);
let (network, ua) = match ZcashAddress::try_from_encoded(&ua_str) {
Ok(addr) => addr
.convert::<(_, UnifiedAddressParser)>()
.map_err(|e| format_err!("Not a Unified Address: {}", e)),
Err(e) => return Err(format_err!("Invalid Zcash address: {}", e)),
}?;
if let Some(addr) = ua.0.sapling() {
let output = env
.new_string(ZcashAddress::from_sapling(network, addr.to_bytes()).encode())
.expect("Couldn't create Java string!");
Ok(output.into_raw())
} else {
Err(format_err!(
"Unified Address doesn't contain a Sapling receiver"
))
}
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_isValidSpendingKey(
env: JNIEnv<'_>,
_: JClass<'_>,
usk: jbyteArray,
) -> jboolean {
let res = panic::catch_unwind(|| {
let _usk = decode_usk(&env, usk)?;
Ok(JNI_TRUE)
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_isValidShieldedAddress(
env: JNIEnv<'_>,
_: JClass<'_>,
addr: JString<'_>,
network_id: jint,
) -> jboolean {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let addr = utils::java_string_to_rust(&env, addr);
match RecipientAddress::decode(&network, &addr) {
Some(addr) => match addr {
RecipientAddress::Shielded(_) => Ok(JNI_TRUE),
RecipientAddress::Transparent(_) | RecipientAddress::Unified(_) => Ok(JNI_FALSE),
},
None => Err(format_err!("Address is for the wrong network")),
}
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_isValidTransparentAddress(
env: JNIEnv<'_>,
_: JClass<'_>,
addr: JString<'_>,
network_id: jint,
) -> jboolean {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let addr = utils::java_string_to_rust(&env, addr);
match RecipientAddress::decode(&network, &addr) {
Some(addr) => match addr {
RecipientAddress::Shielded(_) | RecipientAddress::Unified(_) => Ok(JNI_FALSE),
RecipientAddress::Transparent(_) => Ok(JNI_TRUE),
},
None => Err(format_err!("Address is for the wrong network")),
}
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_isValidUnifiedAddress(
env: JNIEnv<'_>,
_: JClass<'_>,
addr: JString<'_>,
network_id: jint,
) -> jboolean {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let addr = utils::java_string_to_rust(&env, addr);
match RecipientAddress::decode(&network, &addr) {
Some(addr) => match addr {
RecipientAddress::Unified(_) => Ok(JNI_TRUE),
RecipientAddress::Shielded(_) | RecipientAddress::Transparent(_) => Ok(JNI_FALSE),
},
None => Err(format_err!("Address is for the wrong network")),
}
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getBalance(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
accountj: jint,
network_id: jint,
) -> jlong {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let account = AccountId::from(u32::try_from(accountj)?);
// We query the unverified balance including unmined transactions. Shielded notes
// in unmined transactions are never spendable, but this ensures that the balance
// reported to users does not drop temporarily in a way that they don't expect.
// `getVerifiedBalance` requires `ANCHOR_OFFSET` confirmations, which means it
// always shows a spendable balance.
let min_confirmations = 0;
(&db_data)
.get_target_and_anchor_heights(min_confirmations)
.map_err(|e| format_err!("Error while fetching anchor height: {}", e))
.and_then(|opt_anchor| {
opt_anchor
.map(|(_, a)| a)
.ok_or(format_err!("Anchor height not available; scan required."))
})
.and_then(|anchor| {
(&db_data)
.get_balance_at(account, anchor)
.map_err(|e| format_err!("Error while fetching verified balance: {}", e))
})
.map(|amount| amount.into())
});
unwrap_exc_or(&env, res, -1)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getVerifiedTransparentBalance(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
address: JString<'_>,
network_id: jint,
) -> jlong {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let addr = utils::java_string_to_rust(&env, address);
let taddr = TransparentAddress::decode(&network, &addr).unwrap();
let amount = (&db_data)
.get_target_and_anchor_heights(ANCHOR_OFFSET)
.map_err(|e| format_err!("Error while fetching anchor height: {}", e))
.and_then(|opt_anchor| {
opt_anchor
.map(|(_, a)| a)
.ok_or(format_err!("Anchor height not available; scan required."))
})
.and_then(|anchor| {
(&db_data)
.get_unspent_transparent_outputs(&taddr, anchor, &[])
.map_err(|e| format_err!("Error while fetching verified balance: {}", e))
})?
.iter()
.map(|utxo| utxo.txout().value)
.sum::<Option<Amount>>()
.ok_or_else(|| format_err!("Balance overflowed MAX_MONEY."))?;
Ok(amount.into())
});
unwrap_exc_or(&env, res, -1)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getTotalTransparentBalance(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
address: JString<'_>,
network_id: jint,
) -> jlong {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let addr = utils::java_string_to_rust(&env, address);
let taddr = TransparentAddress::decode(&network, &addr).unwrap();
// We select all transparent funds including unmined coins, as that is the same
// set of UTXOs we shield from.
let min_confirmations = 0;
let amount = (&db_data)
.get_target_and_anchor_heights(min_confirmations)
.map_err(|e| format_err!("Error while fetching anchor height: {}", e))
.and_then(|opt_anchor| {
opt_anchor
.map(|(_, a)| a)
.ok_or(format_err!("Anchor height not available; scan required."))
})
.and_then(|anchor| {
(&db_data)
.get_unspent_transparent_outputs(&taddr, anchor, &[])
.map_err(|e| format_err!("Error while fetching verified balance: {}", e))
})?
.iter()
.map(|utxo| utxo.txout().value)
.sum::<Option<Amount>>()
.ok_or_else(|| format_err!("Balance overflowed MAX_MONEY"))?;
Ok(amount.into())
});
unwrap_exc_or(&env, res, -1)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getVerifiedBalance(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
account: jint,
network_id: jint,
) -> jlong {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let account = AccountId::from(u32::try_from(account)?);
(&db_data)
.get_target_and_anchor_heights(ANCHOR_OFFSET)
.map_err(|e| format_err!("Error while fetching anchor height: {}", e))
.and_then(|opt_anchor| {
opt_anchor
.map(|(_, a)| a)
.ok_or(format_err!("Anchor height not available; scan required."))
})
.and_then(|anchor| {
(&db_data)
.get_balance_at(account, anchor)
.map_err(|e| format_err!("Error while fetching verified balance: {}", e))
})
.map(|amount| amount.into())
});
unwrap_exc_or(&env, res, -1)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getReceivedMemoAsUtf8(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
id_note: jlong,
network_id: jint,
) -> jstring {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let memo = (&db_data)
.get_memo(NoteId::ReceivedNoteId(id_note))
.map_err(|e| format_err!("An error occurred retrieving the memo, {}", e))
.and_then(|memo| match memo {
Memo::Empty => Ok("".to_string()),
Memo::Text(memo) => Ok(memo.into()),
_ => Err(format_err!("This memo does not contain UTF-8 text")),
})?;
let output = env.new_string(memo).expect("Couldn't create Java string!");
Ok(output.into_raw())
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getSentMemoAsUtf8(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
id_note: jlong,
network_id: jint,
) -> jstring {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let memo = (&db_data)
.get_memo(NoteId::SentNoteId(id_note))
.map_err(|e| format_err!("An error occurred retrieving the memo, {}", e))
.and_then(|memo| match memo {
Memo::Empty => Ok("".to_string()),
Memo::Text(memo) => Ok(memo.into()),
_ => Err(format_err!("This memo does not contain UTF-8 text")),
})?;
let output = env.new_string(memo).expect("Couldn't create Java string!");
Ok(output.into_raw())
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
fn encode_blockmeta(env: &JNIEnv<'_>, meta: BlockMeta) -> Result<jobject, failure::Error> {
let block_hash = env.byte_array_from_slice(&meta.block_hash.0)?;
let output = env.new_object(
"cash/z/ecc/android/sdk/internal/model/JniBlockMeta",
"(J[BJJJ)V",
&[
JValue::Long(i64::from(u32::from(meta.height))),
JValue::Object(unsafe { JObject::from_raw(block_hash) }),
JValue::Long(i64::from(meta.block_time)),
JValue::Long(i64::from(meta.sapling_outputs_count)),
JValue::Long(i64::from(meta.orchard_actions_count)),
],
)?;
Ok(output.into_raw())
}
fn decode_blockmeta(env: &JNIEnv<'_>, obj: JObject<'_>) -> Result<BlockMeta, failure::Error> {
let long_as_u32 = |name| -> Result<u32, failure::Error> {
Ok(u32::try_from(env.get_field(obj, name, "J")?.j()?)?)
};
fn byte_array<const N: usize>(
env: &JNIEnv<'_>,
obj: JObject<'_>,
name: &str,
) -> Result<[u8; N], failure::Error> {
let field = env.get_field(obj, name, "[B")?.l()?.into_raw();
Ok(env.convert_byte_array(field)?[..].try_into()?)
}
Ok(BlockMeta {
height: BlockHeight::from_u32(long_as_u32("height")?),
block_hash: BlockHash(byte_array(env, obj, "hash")?),
block_time: long_as_u32("time")?,
sapling_outputs_count: long_as_u32("saplingOutputsCount")?,
orchard_actions_count: long_as_u32("orchardOutputsCount")?,
})
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_writeBlockMetadata(
env: JNIEnv<'_>,
_: JClass<'_>,
db_cache: JString<'_>,
block_meta: jobjectArray,
) -> jboolean {
let res = panic::catch_unwind(|| {
let block_db = block_db(&env, db_cache)?;
let block_meta = {
let count = env.get_array_length(block_meta).unwrap();
(0..count)
.map(|i| {
env.get_object_array_element(block_meta, i)
.map_err(|e| e.into())
.and_then(|jobj| decode_blockmeta(&env, jobj))
})
.collect::<Result<Vec<_>, _>>()?
};
match block_db.write_block_metadata(&block_meta) {
Ok(()) => Ok(JNI_TRUE),
Err(e) => Err(format_err!(
"Failed to write block metadata to FsBlockDb: {:?}",
e
)),
}
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getLatestHeight(
env: JNIEnv<'_>,
_: JClass<'_>,
fsblockdb_root: JString<'_>,
) -> jlong {
let res = panic::catch_unwind(|| {
let block_db = block_db(&env, fsblockdb_root)?;
match block_db.get_max_cached_height() {
Ok(Some(block_height)) => Ok(i64::from(u32::from(block_height))),
// Use -1 to return null across the FFI.
Ok(None) => Ok(-1),
Err(e) => Err(format_err!(
"Failed to read block metadata from FsBlockDb: {:?}",
e
)),
}
});
unwrap_exc_or(&env, res, -1)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_findBlockMetadata(
env: JNIEnv<'_>,
_: JClass<'_>,
fsblockdb_root: JString<'_>,
height: jlong,
) -> jobject {
let res = panic::catch_unwind(|| {
let block_db = block_db(&env, fsblockdb_root)?;
let height = BlockHeight::try_from(height)?;
match block_db.find_block(height) {
Ok(Some(meta)) => encode_blockmeta(&env, meta),
Ok(None) => Ok(ptr::null_mut()),
Err(e) => Err(format_err!(
"Failed to read block metadata from FsBlockDb: {:?}",
e
)),
}
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_rewindBlockMetadataToHeight(
env: JNIEnv<'_>,
_: JClass<'_>,
fsblockdb_root: JString<'_>,
height: jlong,
) {
let res = panic::catch_unwind(|| {
let block_db = block_db(&env, fsblockdb_root)?;
let height = BlockHeight::try_from(height)?;
block_db.truncate_to_height(height).map_err(|e| {
format_err!(
"Error while rewinding block metadata DB to height {}: {}",
height,
e
)
})
});
unwrap_exc_or(&env, res, ())
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_validateCombinedChain(
env: JNIEnv<'_>,
_: JClass<'_>,
db_cache: JString<'_>,
db_data: JString<'_>,
limit: jlong,
network_id: jint,
) -> jlong {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let block_db = block_db(&env, db_cache)?;
let db_data = wallet_db(&env, network, db_data)?;
let validate_limit = u32::try_from(limit).ok();
let validate_from = (&db_data)
.get_max_height_hash()
.map_err(|e| format_err!("Error while validating chain: {}", e))?;
let val_res = validate_chain(&block_db, validate_from, validate_limit);
if let Err(e) = val_res {
match e {
chain::error::Error::Chain(e) => {
let upper_bound_u32 = u32::from(e.at_height());
Ok(upper_bound_u32 as i64)
}
_ => Err(format_err!("Error while validating chain: {:?}", e)),
}
} else {
// All blocks are valid, so "highest invalid block height" is below genesis.
Ok(-1)
}
});
unwrap_exc_or(&env, res, 0) as jlong
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_getNearestRewindHeight(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
height: jlong,
network_id: jint,
) -> jlong {
#[allow(deprecated)]
let res = panic::catch_unwind(|| {
if height < 100 {
Ok(height)
} else {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
match db_data.get_min_unspent_height() {
Ok(Some(best_height)) => {
let first_unspent_note_height = u32::from(best_height);
Ok(std::cmp::min(
first_unspent_note_height as i64,
height as i64,
))
}
Ok(None) => Ok(height as i64),
Err(e) => Err(format_err!(
"Error while getting nearest rewind height for {}: {}",
height,
e
)),
}
}
});
unwrap_exc_or(&env, res, -1) as jlong
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_rewindToHeight(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
height: jlong,
network_id: jint,
) -> jboolean {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let mut db_data = db_data.get_update_ops()?;
let height = BlockHeight::try_from(height)?;
db_data
.truncate_to_height(height)
.map(|_| 1)
.map_err(|e| format_err!("Error while rewinding data DB to height {}: {}", height, e))
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_scanBlocks(
env: JNIEnv<'_>,
_: JClass<'_>,
db_cache: JString<'_>,
db_data: JString<'_>,
limit: jlong,
network_id: jint,
) -> jboolean {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_cache = block_db(&env, db_cache)?;
let db_data = wallet_db(&env, network, db_data)?;
let mut db_data = db_data.get_update_ops()?;
let limit = u32::try_from(limit).ok();
match scan_cached_blocks(&network, &db_cache, &mut db_data, limit) {
Ok(()) => Ok(JNI_TRUE),
Err(e) => Err(format_err!(
"Rust error while scanning blocks (limit {:?}): {:?}",
limit,
e
)),
}
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_putUtxo(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
address: JString<'_>,
txid_bytes: jbyteArray,
index: jint,
script: jbyteArray,
value: jlong,
height: jint,
network_id: jint,
) -> jboolean {
// debug!("For height {} found consensus branch {:?}", height, branch);
debug!("preparing to store UTXO in db_data");
#[allow(deprecated)]
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let txid_bytes = env.convert_byte_array(txid_bytes).unwrap();
let mut txid = [0u8; 32];
txid.copy_from_slice(&txid_bytes);
let script_pubkey = Script(env.convert_byte_array(script).unwrap());
let db_data = wallet_db(&env, network, db_data)?;
let mut db_data = db_data.get_update_ops()?;
let addr = utils::java_string_to_rust(&env, address);
let _address = TransparentAddress::decode(&network, &addr).unwrap();
let output = WalletTransparentOutput::from_parts(
OutPoint::new(txid, index as u32),
TxOut {
value: Amount::from_i64(value).unwrap(),
script_pubkey,
},
BlockHeight::from(height as u32),
)
.ok_or_else(|| format_err!("UTXO is not P2PKH or P2SH"))?;
debug!("Storing UTXO in db_data");
match db_data.put_received_transparent_utxo(&output) {
Ok(_) => Ok(JNI_TRUE),
Err(e) => Err(format_err!("Error while inserting UTXO: {}", e)),
}
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_decryptAndStoreTransaction(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
tx: jbyteArray,
network_id: jint,
) -> jboolean {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let mut db_data = db_data.get_update_ops()?;
let tx_bytes = env.convert_byte_array(tx).unwrap();
// The consensus branch ID passed in here does not matter:
// - v4 and below cache it internally, but all we do with this transaction while
// it is in memory is decryption and serialization, neither of which use the
// consensus branch ID.
// - v5 and above transactions ignore the argument, and parse the correct value
// from their encoding.
let tx = Transaction::read(&tx_bytes[..], BranchId::Sapling)?;
match decrypt_and_store_transaction(&network, &mut db_data, &tx) {
Ok(()) => Ok(JNI_TRUE),
Err(e) => Err(format_err!("Error while decrypting transaction: {}", e)),
}
});
unwrap_exc_or(&env, res, JNI_FALSE)
}
fn zip317_helper<Ctx, DbT, R>(
context: Ctx,
use_zip317_fees: jboolean,
enabled: impl FnOnce(Ctx, GreedyInputSelector<DbT, zip317::SingleOutputChangeStrategy>) -> R,
disabled: impl FnOnce(Ctx, GreedyInputSelector<DbT, fixed::SingleOutputChangeStrategy>) -> R,
) -> R {
if use_zip317_fees == JNI_TRUE {
let input_selector = GreedyInputSelector::new(
zip317::SingleOutputChangeStrategy::new(zip317::FeeRule::standard()),
DustOutputPolicy::default(),
);
enabled(context, input_selector)
} else {
let input_selector = GreedyInputSelector::new(
fixed::SingleOutputChangeStrategy::new(fixed::FeeRule::standard()),
DustOutputPolicy::default(),
);
disabled(context, input_selector)
}
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_createToAddress(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
usk: jbyteArray,
to: JString<'_>,
value: jlong,
memo: jbyteArray,
spend_params: JString<'_>,
output_params: JString<'_>,
network_id: jint,
use_zip317_fees: jboolean,
) -> jlong {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let mut db_data = db_data.get_update_ops()?;
let usk = decode_usk(&env, usk)?;
let to = utils::java_string_to_rust(&env, to);
let value =
Amount::from_i64(value).map_err(|()| format_err!("Invalid amount, out of range"))?;
if value.is_negative() {
return Err(format_err!("Amount is negative"));
}
let memo_bytes = env.convert_byte_array(memo).unwrap();
let spend_params = utils::java_string_to_rust(&env, spend_params);
let output_params = utils::java_string_to_rust(&env, output_params);
let to = match RecipientAddress::decode(&network, &to) {
Some(to) => to,
None => {
return Err(format_err!("Address is for the wrong network"));
}
};
// TODO: consider warning in this case somehow, rather than swallowing this error
let memo = match to {
RecipientAddress::Shielded(_) | RecipientAddress::Unified(_) => {
let memo_value =
Memo::from_bytes(&memo_bytes).map_err(|_| format_err!("Invalid memo"))?;
Some(MemoBytes::from(&memo_value))
}
RecipientAddress::Transparent(_) => None,
};
let prover = LocalTxProver::new(Path::new(&spend_params), Path::new(&output_params));
let request = TransactionRequest::new(vec![Payment {
recipient_address: to,
amount: value,
memo,
label: None,
message: None,
other_params: vec![],
}])
.map_err(|e| format_err!("Error creating transaction request: {:?}", e))?;
zip317_helper(
(&mut db_data, prover, request),
use_zip317_fees,
|(wallet_db, prover, request), input_selector| {
spend(
wallet_db,
&network,
prover,
&input_selector,
&usk,
request,
OvkPolicy::Sender,
ANCHOR_OFFSET,
)
.map_err(|e| format_err!("Error while creating transaction: {}", e))
},
|(wallet_db, prover, request), input_selector| {
spend(
wallet_db,
&network,
prover,
&input_selector,
&usk,
request,
OvkPolicy::Sender,
ANCHOR_OFFSET,
)
.map_err(|e| format_err!("Error while creating transaction: {}", e))
},
)
});
unwrap_exc_or(&env, res, -1)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_shieldToAddress(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
usk: jbyteArray,
memo: jbyteArray,
spend_params: JString<'_>,
output_params: JString<'_>,
network_id: jint,
use_zip317_fees: jboolean,
) -> jlong {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let db_data = wallet_db(&env, network, db_data)?;
let mut db_data = db_data.get_update_ops()?;
let usk = decode_usk(&env, usk)?;
let memo_bytes = env.convert_byte_array(memo).unwrap();
let spend_params = utils::java_string_to_rust(&env, spend_params);
let output_params = utils::java_string_to_rust(&env, output_params);
let min_confirmations = 0;
let account = db_data
.get_account_for_ufvk(&usk.to_unified_full_viewing_key())?
.ok_or_else(|| format_err!("Spending key not recognized."))?;
let from_addrs: Vec<TransparentAddress> = db_data
.get_target_and_anchor_heights(min_confirmations)
.map_err(|e| format_err!("Error while fetching anchor height: {}", e))
.and_then(|opt_anchor| {
opt_anchor
.map(|(_, a)| a)
.ok_or(format_err!("Anchor height not available; scan required."))
})
.and_then(|anchor| {
db_data
.get_transparent_balances(account, anchor)
.map_err(|e| {
format_err!(
"Error while fetching transparent balances for {:?}: {}",
account,
e
)
})
})?
.into_keys()
.collect();
let memo = Memo::from_bytes(&memo_bytes).unwrap();
let prover = LocalTxProver::new(Path::new(&spend_params), Path::new(&output_params));
let shielding_threshold = NonNegativeAmount::from_u64(100000).unwrap();
zip317_helper(
(&mut db_data, prover),
use_zip317_fees,
|(wallet_db, prover), input_selector| {
shield_transparent_funds(
wallet_db,
&network,
prover,
&input_selector,
shielding_threshold,
&usk,
&from_addrs,
&MemoBytes::from(&memo),
min_confirmations,
)
.map_err(|e| format_err!("Error while shielding transaction: {}", e))
},
|(wallet_db, prover), input_selector| {
shield_transparent_funds(
wallet_db,
&network,
prover,
&input_selector,
shielding_threshold,
&usk,
&from_addrs,
&MemoBytes::from(&memo),
min_confirmations,
)
.map_err(|e| format_err!("Error while shielding transaction: {}", e))
},
)
});
unwrap_exc_or(&env, res, -1)
}
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_branchIdForHeight(
env: JNIEnv<'_>,
_: JClass<'_>,
height: jlong,
network_id: jint,
) -> jlong {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let branch: BranchId = BranchId::for_height(&network, BlockHeight::from(height as u32));
let branch_id: u32 = u32::from(branch);
debug!(
"For height {} found consensus branch {:?} with id {}",
height, branch, branch_id
);
Ok(branch_id.into())
});
unwrap_exc_or(&env, res, -1)
}
//
// Utility functions
//
fn parse_network(value: u32) -> Result<Network, failure::Error> {
match value {
0 => Ok(TestNetwork),
1 => Ok(MainNetwork),
_ => Err(format_err!("Invalid network type: {}. Expected either 0 or 1 for Testnet or Mainnet, respectively.", value))
}
}
/// Returns a list of the transparent receivers for the diversified unified addresses that have
/// been allocated for the provided account.
///
/// # Safety
///
/// - `db_data` must be non-null and valid for reads for `db_data_len` bytes, and it must have an
/// alignment of `1`. Its contents must be a string representing a valid system path in the
/// operating system's preferred representation.
/// - The memory referenced by `db_data` must not be mutated for the duration of the function call.
/// - The total size `db_data_len` must be no larger than `isize::MAX`. See the safety
/// documentation of pointer::offset.
/// - Call [`zcashlc_free_keys`] to free the memory associated with the returned pointer
/// when done using it.
#[no_mangle]
pub unsafe extern "C" fn Java_cash_z_ecc_android_sdk_internal_jni_RustBackend_listTransparentReceivers(
env: JNIEnv<'_>,
_: JClass<'_>,
db_data: JString<'_>,
account_id: jint,
network_id: jint,
) -> jobjectArray {
let res = panic::catch_unwind(|| {
let network = parse_network(network_id as u32)?;
let zcash_network = network
.address_network()
.expect("network_id parsing should not have resulted in an unrecognized network type.");
let db_data = wallet_db(&env, network, db_data)?;
let account_id = if account_id >= 0 {
account_id as u32
} else {
return Err(format_err!("Account id must be nonnegative."));
};
let account = AccountId::from(account_id);
match db_data.get_transparent_receivers(account) {
Ok(receivers) => {
let trasparent_receivers = receivers
.iter()
.map(|(taddr, _)| {
let taddr = match taddr {
TransparentAddress::PublicKey(data) => {
ZcashAddress::from_transparent_p2pkh(zcash_network, *data)
}
TransparentAddress::Script(data) => {
ZcashAddress::from_transparent_p2sh(zcash_network, *data)
}
};
taddr.encode()
})
.collect::<Vec<_>>();
Ok(utils::rust_vec_to_java(
&env,
trasparent_receivers,
"java/lang/String",
|env, taddr| env.new_string(taddr),
|env| env.new_string(""),
))
}
Err(e) => Err(format_err!("Error while fetching address: {}", e)),
}
});
unwrap_exc_or(&env, res, ptr::null_mut())
}
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