368 lines
14 KiB
Rust
368 lines
14 KiB
Rust
//! *Parser for all defined Zcash address types.*
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//!
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//! This crate implements address parsing as a two-phase process, built around the opaque
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//! [`ZcashAddress`] type.
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//!
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//! - [`ZcashAddress`] can be parsed from, and encoded to, strings.
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//! - [`ZcashAddress::convert`] or [`ZcashAddress::convert_if_network`] can be used to
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//! convert a parsed address into custom types that implement the [`TryFromAddress`] or
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//! [`TryFromRawAddress`] traits.
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//! - Custom types can be converted into a [`ZcashAddress`] via its implementation of the
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//! [`ToAddress`] trait.
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//!
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//! ```text
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//! s.parse() .convert()
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//! --------> --------->
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//! Strings ZcashAddress Custom types
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//! <-------- <---------
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//! .encode() ToAddress
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//! ```
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//!
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//! It is important to note that this crate does not depend on any of the Zcash protocol
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//! crates (e.g. `sapling-crypto` or `orchard`). This crate has minimal dependencies by
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//! design; it focuses solely on parsing, handling those concerns for you, while exposing
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//! APIs that enable you to convert the parsed data into the Rust types you want to use.
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//!
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//! # Using this crate
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//!
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//! ## I just need to validate Zcash addresses
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//!
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//! ```
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//! # use zcash_address::ZcashAddress;
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//! fn is_valid_zcash_address(addr_string: &str) -> bool {
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//! addr_string.parse::<ZcashAddress>().is_ok()
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//! }
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//! ```
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//!
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//! ## I want to parse Zcash addresses in a Rust wallet app that uses the `zcash_primitives` transaction builder
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//!
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//! Use `zcash_client_backend::address::RecipientAddress`, which implements the traits in
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//! this crate to parse address strings into protocol types that work with the transaction
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//! builder in the `zcash_primitives` crate (as well as the wallet functionality in the
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//! `zcash_client_backend` crate itself).
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//!
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//! > We intend to refactor the key and address types from the `zcash_client_backend` and
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//! > `zcash_primitives` crates into a separate crate focused on dealing with Zcash key
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//! > material. That crate will then be what you should use.
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//!
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//! ## I want to parse Unified Addresses
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//!
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//! See the [`unified::Address`] documentation for examples.
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//!
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//! While the [`unified::Address`] type does have parsing methods, you should still parse
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//! your address strings with [`ZcashAddress`] and then convert; this will ensure that for
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//! other Zcash address types you get a [`ConversionError::Unsupported`], which is a
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//! better error for your users.
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//!
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//! ## I want to parse mainnet Zcash addresses in a language that supports C FFI
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//!
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//! As an example, you could use static functions to create the address types in the
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//! target language from the parsed data.
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//!
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//! ```
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//! use std::ffi::{CStr, c_char, c_void};
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//! use std::ptr;
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//!
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//! use zcash_address::{ConversionError, Network, TryFromRawAddress, ZcashAddress};
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//!
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//! // Functions that return a pointer to a heap-allocated address of the given kind in
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//! // the target language. These should be augmented to return any relevant errors.
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//! extern {
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//! fn addr_from_sapling(data: *const u8) -> *mut c_void;
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//! fn addr_from_transparent_p2pkh(data: *const u8) -> *mut c_void;
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//! }
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//!
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//! struct ParsedAddress(*mut c_void);
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//!
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//! impl TryFromRawAddress for ParsedAddress {
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//! type Error = &'static str;
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//!
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//! fn try_from_raw_sapling(
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//! data: [u8; 43],
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//! ) -> Result<Self, ConversionError<Self::Error>> {
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//! let parsed = unsafe { addr_from_sapling(data[..].as_ptr()) };
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//! if parsed.is_null() {
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//! Err("Reason for the failure".into())
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//! } else {
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//! Ok(Self(parsed))
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//! }
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//! }
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//!
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//! fn try_from_raw_transparent_p2pkh(
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//! data: [u8; 20],
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//! ) -> Result<Self, ConversionError<Self::Error>> {
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//! let parsed = unsafe { addr_from_transparent_p2pkh(data[..].as_ptr()) };
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//! if parsed.is_null() {
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//! Err("Reason for the failure".into())
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//! } else {
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//! Ok(Self(parsed))
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//! }
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//! }
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//! }
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//!
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//! pub extern "C" fn parse_zcash_address(encoded: *const c_char) -> *mut c_void {
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//! let encoded = unsafe { CStr::from_ptr(encoded) }.to_str().expect("valid");
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//!
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//! let addr = match ZcashAddress::try_from_encoded(encoded) {
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//! Ok(addr) => addr,
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//! Err(e) => {
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//! // This was either an invalid address encoding, or not a Zcash address.
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//! // You should pass this error back across the FFI.
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//! return ptr::null_mut();
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//! }
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//! };
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//!
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//! match addr.convert_if_network::<ParsedAddress>(Network::Main) {
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//! Ok(parsed) => parsed.0,
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//! Err(e) => {
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//! // We didn't implement all of the methods of `TryFromRawAddress`, so if an
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//! // address with one of those kinds is parsed, it will result in an error
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//! // here that should be passed back across the FFI.
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//! ptr::null_mut()
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//! }
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//! }
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//! }
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//! ```
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#![cfg_attr(docsrs, feature(doc_cfg))]
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#![cfg_attr(docsrs, feature(doc_auto_cfg))]
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// Catch documentation errors caused by code changes.
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#![deny(rustdoc::broken_intra_doc_links)]
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mod convert;
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mod encoding;
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mod kind;
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#[cfg(any(test, feature = "test-dependencies"))]
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pub mod test_vectors;
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pub use convert::{
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ConversionError, ToAddress, TryFromAddress, TryFromRawAddress, UnsupportedAddress,
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};
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pub use encoding::ParseError;
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pub use kind::unified;
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pub use zcash_protocol::consensus::NetworkType as Network;
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use zcash_protocol::{PoolType, ShieldedProtocol};
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/// A Zcash address.
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#[derive(Clone, Debug, PartialEq, Eq, Hash)]
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pub struct ZcashAddress {
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net: Network,
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kind: AddressKind,
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}
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/// Known kinds of Zcash addresses.
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#[derive(Clone, Debug, PartialEq, Eq, Hash)]
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enum AddressKind {
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Sprout([u8; 64]),
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Sapling([u8; 43]),
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Unified(unified::Address),
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P2pkh([u8; 20]),
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P2sh([u8; 20]),
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Tex([u8; 20]),
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}
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impl ZcashAddress {
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/// Encodes this Zcash address in its canonical string representation.
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///
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/// This provides the encoded string representation of the address as defined by the
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/// [Zcash protocol specification](https://zips.z.cash/protocol.pdf) and/or
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/// [ZIP 316](https://zips.z.cash/zip-0316). The [`Display` implementation] can also
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/// be used to produce this encoding using [`address.to_string()`].
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///
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/// [`Display` implementation]: std::fmt::Display
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/// [`address.to_string()`]: std::string::ToString
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pub fn encode(&self) -> String {
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format!("{}", self)
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}
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/// Attempts to parse the given string as a Zcash address.
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///
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/// This simply calls [`s.parse()`], leveraging the [`FromStr` implementation].
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///
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/// [`s.parse()`]: std::primitive::str::parse
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/// [`FromStr` implementation]: ZcashAddress#impl-FromStr
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///
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/// # Errors
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///
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/// - If the parser can detect that the string _must_ contain an address encoding used
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/// by Zcash, [`ParseError::InvalidEncoding`] will be returned if any subsequent
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/// part of that encoding is invalid.
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///
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/// - In all other cases, [`ParseError::NotZcash`] will be returned on failure.
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///
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/// # Examples
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///
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/// ```
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/// use zcash_address::ZcashAddress;
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///
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/// let encoded = "zs1z7rejlpsa98s2rrrfkwmaxu53e4ue0ulcrw0h4x5g8jl04tak0d3mm47vdtahatqrlkngh9sly";
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/// let addr = ZcashAddress::try_from_encoded(&encoded);
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/// assert_eq!(encoded.parse(), addr);
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/// ```
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pub fn try_from_encoded(s: &str) -> Result<Self, ParseError> {
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s.parse()
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}
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/// Converts this address into another type.
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///
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/// `convert` can convert into any type that implements the [`TryFromAddress`] trait.
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/// This enables `ZcashAddress` to be used as a common parsing and serialization
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/// interface for Zcash addresses, while delegating operations on those addresses
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/// (such as constructing transactions) to downstream crates.
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///
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/// If you want to get the encoded string for this address, use the [`encode`]
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/// method or the [`Display` implementation] via [`address.to_string()`] instead.
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///
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/// [`encode`]: Self::encode
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/// [`Display` implementation]: std::fmt::Display
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/// [`address.to_string()`]: std::string::ToString
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pub fn convert<T: TryFromAddress>(self) -> Result<T, ConversionError<T::Error>> {
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match self.kind {
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AddressKind::Sprout(data) => T::try_from_sprout(self.net, data),
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AddressKind::Sapling(data) => T::try_from_sapling(self.net, data),
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AddressKind::Unified(data) => T::try_from_unified(self.net, data),
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AddressKind::P2pkh(data) => T::try_from_transparent_p2pkh(self.net, data),
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AddressKind::P2sh(data) => T::try_from_transparent_p2sh(self.net, data),
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AddressKind::Tex(data) => T::try_from_tex(self.net, data),
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}
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}
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/// Converts this address into another type, if it matches the expected network.
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///
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/// `convert_if_network` can convert into any type that implements the
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/// [`TryFromRawAddress`] trait. This enables `ZcashAddress` to be used as a common
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/// parsing and serialization interface for Zcash addresses, while delegating
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/// operations on those addresses (such as constructing transactions) to downstream
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/// crates.
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///
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/// If you want to get the encoded string for this address, use the [`encode`]
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/// method or the [`Display` implementation] via [`address.to_string()`] instead.
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///
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/// [`encode`]: Self::encode
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/// [`Display` implementation]: std::fmt::Display
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/// [`address.to_string()`]: std::string::ToString
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pub fn convert_if_network<T: TryFromRawAddress>(
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self,
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net: Network,
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) -> Result<T, ConversionError<T::Error>> {
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let network_matches = self.net == net;
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// The Sprout and transparent address encodings use the same prefix for testnet
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// and regtest, so we need to allow parsing testnet addresses as regtest.
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let regtest_exception =
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network_matches || (self.net == Network::Test && net == Network::Regtest);
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match self.kind {
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AddressKind::Sprout(data) if regtest_exception => T::try_from_raw_sprout(data),
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AddressKind::Sapling(data) if network_matches => T::try_from_raw_sapling(data),
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AddressKind::Unified(data) if network_matches => T::try_from_raw_unified(data),
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AddressKind::P2pkh(data) if regtest_exception => {
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T::try_from_raw_transparent_p2pkh(data)
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}
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AddressKind::P2sh(data) if regtest_exception => T::try_from_raw_transparent_p2sh(data),
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AddressKind::Tex(data) if network_matches => T::try_from_raw_tex(data),
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_ => Err(ConversionError::IncorrectNetwork {
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expected: net,
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actual: self.net,
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}),
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}
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}
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/// Returns whether this address has the ability to receive transfers of the given pool type.
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pub fn can_receive_as(&self, pool_type: PoolType) -> bool {
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match &self.kind {
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AddressKind::Sprout(_) => false,
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AddressKind::Sapling(_) => pool_type == PoolType::Shielded(ShieldedProtocol::Sapling),
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AddressKind::Unified(addr) => addr.has_receiver(pool_type),
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AddressKind::P2pkh(_) => pool_type == PoolType::Transparent,
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AddressKind::P2sh(_) => pool_type == PoolType::Transparent,
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AddressKind::Tex(_) => pool_type == PoolType::Transparent,
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}
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}
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/// Returns whether this address can receive a memo.
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pub fn can_receive_memo(&self) -> bool {
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match &self.kind {
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AddressKind::Sprout(_) => true,
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AddressKind::Sapling(_) => true,
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AddressKind::Unified(addr) => addr.can_receive_memo(),
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AddressKind::P2pkh(_) => false,
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AddressKind::P2sh(_) => false,
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AddressKind::Tex(_) => false,
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}
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}
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}
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#[cfg(feature = "test-dependencies")]
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pub mod testing {
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use std::convert::TryInto;
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use proptest::{array::uniform20, collection::vec, prelude::any, prop_compose, prop_oneof};
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use crate::{unified::address::testing::arb_unified_address, AddressKind, ZcashAddress};
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use zcash_protocol::consensus::NetworkType;
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prop_compose! {
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fn arb_sprout_addr_kind()(
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r_bytes in vec(any::<u8>(), 64)
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) -> AddressKind {
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AddressKind::Sprout(r_bytes.try_into().unwrap())
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}
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}
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prop_compose! {
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fn arb_sapling_addr_kind()(
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r_bytes in vec(any::<u8>(), 43)
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) -> AddressKind {
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AddressKind::Sapling(r_bytes.try_into().unwrap())
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}
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}
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prop_compose! {
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fn arb_p2pkh_addr_kind()(
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r_bytes in uniform20(any::<u8>())
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) -> AddressKind {
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AddressKind::P2pkh(r_bytes)
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}
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}
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prop_compose! {
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fn arb_p2sh_addr_kind()(
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r_bytes in uniform20(any::<u8>())
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) -> AddressKind {
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AddressKind::P2sh(r_bytes)
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}
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}
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prop_compose! {
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fn arb_unified_addr_kind()(
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uaddr in arb_unified_address()
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) -> AddressKind {
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AddressKind::Unified(uaddr)
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}
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}
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prop_compose! {
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fn arb_tex_addr_kind()(
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r_bytes in uniform20(any::<u8>())
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) -> AddressKind {
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AddressKind::Tex(r_bytes)
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}
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}
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prop_compose! {
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pub fn arb_address(net: NetworkType)(
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kind in prop_oneof!(
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arb_sprout_addr_kind(),
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arb_sapling_addr_kind(),
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arb_p2pkh_addr_kind(),
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arb_p2sh_addr_kind(),
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arb_unified_addr_kind(),
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arb_tex_addr_kind()
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)
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) -> ZcashAddress {
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ZcashAddress { net, kind }
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}
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}
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}
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