Pr/no std protocol core

Cargo-minimal.lock

@@ -479,6 +479,15 @@ dependencies = [
  "url",
 ]
 
+[[package]]
+name = "bhttp"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d305a54bcb99974213b4c78a486c34091e83c5d6d6572f7f4331c904ea9d127"
+dependencies = [
+ "thiserror 2.0.18",
+]
+
 [[package]]
 name = "bip39"
 version = "2.2.2"
@@ -2761,11 +2770,12 @@ checksum = "df94ce210e5bc13cb6651479fa48d14f601d9858cfe0467f43ae157023b938d3"
 name = "payjoin"
 version = "0.25.0"
 dependencies = [
- "bhttp",
+ "bhttp 0.7.2",
  "bitcoin 0.32.8",
  "bitcoin-hpke",
  "bitcoin-ohttp",
  "bitcoin_uri",
+ "getrandom 0.3.4",
  "http",
  "once_cell",
  "payjoin-test-utils",
@@ -2850,7 +2860,7 @@ dependencies = [
  "anyhow",
  "axum",
  "axum-server",
- "bhttp",
+ "bhttp 0.6.1",
  "bitcoin 0.32.8",
  "bitcoin-ohttp",
  "byteorder",

Cargo-recent.lock

@@ -479,6 +479,15 @@ dependencies = [
  "url",
 ]
 
+[[package]]
+name = "bhttp"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d305a54bcb99974213b4c78a486c34091e83c5d6d6572f7f4331c904ea9d127"
+dependencies = [
+ "thiserror 2.0.18",
+]
+
 [[package]]
 name = "bip39"
 version = "2.2.0"
@@ -1665,21 +1674,21 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
 [[package]]
 name = "getrandom"
-version = "0.3.3"
+version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26145e563e54f2cadc477553f1ec5ee650b00862f0a58bcd12cbdc5f0ea2d2f4"
+checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
 dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
  "r-efi",
- "wasi 0.14.2+wasi-0.2.4",
+ "wasip2",
  "wasm-bindgen",
 ]
 
@@ -1869,12 +1878,11 @@ dependencies = [
 
 [[package]]
 name = "http"
-version = "1.3.1"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4a85d31aea989eead29a3aaf9e1115a180df8282431156e533de47660892565"
+checksum = "e3ba2a386d7f85a81f119ad7498ebe444d2e22c2af0b86b069416ace48b3311a"
 dependencies = [
  "bytes",
- "fnv",
  "itoa",
 ]
 
@@ -2203,7 +2211,7 @@ version = "0.1.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9afb3de4395d6b3e67a780b6de64b51c978ecf11cb9a462c66be7d4ca9039d33"
 dependencies = [
- "getrandom 0.3.3",
+ "getrandom 0.3.4",
  "libc",
 ]
 
@@ -2430,7 +2438,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78bed444cc8a2160f01cbcf811ef18cac863ad68ae8ca62092e8db51d51c761c"
 dependencies = [
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "windows-sys 0.59.0",
 ]
 
@@ -2729,11 +2737,12 @@ checksum = "8835116a5c179084a830efb3adc117ab007512b535bc1a21c991d3b32a6b44dd"
 name = "payjoin"
 version = "0.25.0"
 dependencies = [
- "bhttp",
+ "bhttp 0.7.2",
  "bitcoin 0.32.8",
  "bitcoin-hpke",
  "bitcoin-ohttp",
  "bitcoin_uri",
+ "getrandom 0.3.4",
  "http",
  "once_cell",
  "payjoin-test-utils",
@@ -2818,7 +2827,7 @@ dependencies = [
  "anyhow",
  "axum",
  "axum-server",
- "bhttp",
+ "bhttp 0.6.1",
  "bitcoin 0.32.8",
  "bitcoin-ohttp",
  "byteorder",
@@ -3134,7 +3143,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49df843a9161c85bb8aae55f101bc0bac8bcafd637a620d9122fd7e0b2f7422e"
 dependencies = [
  "bytes",
- "getrandom 0.3.3",
+ "getrandom 0.3.4",
  "lru-slab",
  "rand 0.9.1",
  "ring",
@@ -3255,7 +3264,7 @@ version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "99d9a13982dcf210057a8a78572b2217b667c3beacbf3a0d8b454f6f82837d38"
 dependencies = [
- "getrandom 0.3.3",
+ "getrandom 0.3.4",
 ]
 
 [[package]]
@@ -4100,7 +4109,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e8a64e3985349f2441a1a9ef0b853f869006c3855f2cda6862a94d26ebb9d6a1"
 dependencies = [
  "fastrand",
- "getrandom 0.3.3",
+ "getrandom 0.3.4",
  "once_cell",
  "rustix 1.0.7",
  "windows-sys 0.59.0",
@@ -4927,7 +4936,7 @@ version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2e054861b4bd027cd373e18e8d8d8e6548085000e41290d95ce0c373a654b4a"
 dependencies = [
- "getrandom 0.3.3",
+ "getrandom 0.3.4",
  "js-sys",
  "rand 0.9.1",
  "wasm-bindgen",
@@ -4967,12 +4976,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
 [[package]]
-name = "wasi"
-version = "0.14.2+wasi-0.2.4"
+name = "wasip2"
+version = "1.0.2+wasi-0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9683f9a5a998d873c0d21fcbe3c083009670149a8fab228644b8bd36b2c48cb3"
+checksum = "9517f9239f02c069db75e65f174b3da828fe5f5b945c4dd26bd25d89c03ebcf5"
 dependencies = [
- "wit-bindgen-rt",
+ "wit-bindgen",
 ]
 
 [[package]]
@@ -5397,13 +5406,10 @@ dependencies = [
 ]
 
 [[package]]
-name = "wit-bindgen-rt"
-version = "0.39.0"
+name = "wit-bindgen"
+version = "0.51.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
-dependencies = [
- "bitflags 2.6.0",
-]
+checksum = "d7249219f66ced02969388cf2bb044a09756a083d0fab1e566056b04d9fbcaa5"
 
 [[package]]
 name = "writeable"

payjoin-ffi/src/receive/mod.rs

@@ -206,7 +206,11 @@ impl From<payjoin::receive::v2::SessionHistory> for ReceiverSessionHistory {
 #[uniffi::export]
 impl ReceiverSessionHistory {
     /// Receiver session Payjoin URI
-    pub fn pj_uri(&self) -> Arc<crate::PjUri> { Arc::new(self.0.pj_uri().into()) }
+    pub fn pj_uri(&self) -> Arc<crate::PjUri> {
+        // SAFETY: pj_uri() returns PjUri<'static> — label and message are None
+        let uri: payjoin::PjUri<'static> = unsafe { core::mem::transmute(self.0.pj_uri()) };
+        Arc::new(uri.into())
+    }
 
     /// Fallback transaction from the session if present
     pub fn fallback_tx(&self) -> Option<Vec<u8>> {

payjoin/src/bech32.rs

@@ -1,3 +1,8 @@
+#[cfg(feature = "alloc")]
+use alloc::string::String;
+#[cfg(not(feature = "std"))]
+use alloc::vec::Vec;
+
 use bitcoin::bech32::primitives::decode::{CheckedHrpstring, CheckedHrpstringError};
 use bitcoin::bech32::{self, EncodeError, Hrp, NoChecksum};
 

payjoin/src/core/error.rs

@@ -1,6 +1,29 @@
-use std::fmt::Debug;
-use std::{error, fmt};
+#[cfg(not(feature = "std"))]
+use alloc::boxed::Box;
+#[cfg(not(feature = "std"))]
+use core::error;
+use core::fmt::{self, Debug};
+#[cfg(feature = "std")]
+use std::error;
 
+#[derive(Debug)]
+pub struct StdRequiredError;
+
+impl fmt::Display for StdRequiredError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "std is required for this operation")
+    }
+}
+
+#[cfg(feature = "std")]
+impl std::error::Error for StdRequiredError {}
+
+#[cfg(not(feature = "std"))]
+impl core::error::Error for StdRequiredError {}
+
+impl ImplementationError {
+    pub fn std_required() -> Self { ImplementationError(Box::new(StdRequiredError)) }
+}
 #[derive(Debug)]
 pub struct ImplementationError(Box<dyn error::Error + Send + Sync>);
 
@@ -11,7 +34,7 @@ impl ImplementationError {
 }
 
 impl fmt::Display for ImplementationError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { std::fmt::Display::fmt(&self.0, f) }
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fmt::Display::fmt(&self.0, f) }
 }
 
 impl error::Error for ImplementationError {
@@ -34,16 +57,17 @@ impl From<&str> for ImplementationError {
         ImplementationError::from(error)
     }
 }
+
 /// Errors that can occur when replaying a session event log
 #[cfg(feature = "v2")]
 #[derive(Debug)]
 pub struct ReplayError<SessionState, SessionEvent>(InternalReplayError<SessionState, SessionEvent>);
 
 #[cfg(feature = "v2")]
-impl<SessionState: Debug, SessionEvent: Debug> std::fmt::Display
+impl<SessionState: Debug, SessionEvent: Debug> fmt::Display
     for ReplayError<SessionState, SessionEvent>
 {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         use InternalReplayError::*;
         match &self.0 {
             NoEvents => write!(f, "No events found in session"),
@@ -56,8 +80,9 @@ impl<SessionState: Debug, SessionEvent: Debug> std::fmt::Display
         }
     }
 }
+
 #[cfg(feature = "v2")]
-impl<SessionState: Debug, SessionEvent: Debug> std::error::Error
+impl<SessionState: Debug, SessionEvent: Debug> error::Error
     for ReplayError<SessionState, SessionEvent>
 {
 }
@@ -71,6 +96,7 @@ impl<SessionState: Debug, SessionEvent: Debug> From<InternalReplayError<SessionS
 
 #[cfg(feature = "v2")]
 #[derive(Debug)]
+#[allow(dead_code)]
 pub(crate) enum InternalReplayError<SessionState, SessionEvent> {
     /// No events in the event log
     NoEvents,