Add some no-exporting of more offers code

These really could be handled in the bindings, but for lack of
immediate users there's not a strong reason to, so instead we just
disable them for now.

Author: TheBlueMatt

lightning/src/offers/invoice.rs

@@ -311,6 +311,8 @@ impl<'a, S: SigningPubkeyStrategy> InvoiceBuilder<'a, S> {
 	///
 	/// Successive calls to this method will add another address. Caller is responsible for not
 	/// adding duplicate addresses and only calling if capable of receiving to P2TR addresses.
+	///
+	/// This is not exported to bindings users as TweakedPublicKey isn't yet mapped.
 	pub fn fallback_v1_p2tr_tweaked(mut self, output_key: &TweakedPublicKey) -> Self {
 		let address = FallbackAddress {
 			version: WitnessVersion::V1.to_num(),
@@ -476,6 +478,8 @@ impl Invoice {
 	///
 	/// Blinded paths provide recipient privacy by obfuscating its node id. Note, however, that this
 	/// privacy is lost if a public node id is used for [`Invoice::signing_pubkey`].
+	///
+	/// This is not exported to bindings users as a slice of tuples isn't exportable.
 	pub fn payment_paths(&self) -> &[(BlindedPath, BlindedPayInfo)] {
 		&self.contents.fields().payment_paths[..]
 	}
@@ -516,6 +520,8 @@ impl Invoice {
 
 	/// Fallback addresses for paying the invoice on-chain, in order of most-preferred to
 	/// least-preferred.
+	///
+	/// This is not exported to bindings users as Address is not yet mapped
 	pub fn fallbacks(&self) -> Vec<Address> {
 		let network = match self.network() {
 			None => return Vec::new(),
@@ -580,6 +586,8 @@ impl Invoice {
 	}
 
 	/// Signature of the invoice verified using [`Invoice::signing_pubkey`].
+	///
+	/// This is not exported to bindings users as SIgnature is not yet mapped.
 	pub fn signature(&self) -> Signature {
 		self.signature
 	}

lightning/src/offers/invoice_request.rs

@@ -464,6 +464,8 @@ impl InvoiceRequest {
 
 	/// Signature of the invoice request using [`payer_id`].
 	///
+	/// This is not exported to bindings users as Signature is not yet mapped.
+	///
 	/// [`payer_id`]: Self::payer_id
 	pub fn signature(&self) -> Signature {
 		self.signature
@@ -572,6 +574,8 @@ impl InvoiceRequest {
 	/// keys need to sign an [`Invoice`] for the request if they could be extracted from the
 	/// metadata.
 	///
+	/// This is not exported to bindings users as KeyPair is not yet mapped.
+	///
 	/// [`Invoice`]: crate::offers::invoice::Invoice
 	pub fn verify<T: secp256k1::Signing>(
 		&self, key: &ExpandedKey, secp_ctx: &Secp256k1<T>

lightning/src/offers/offer.rs

@@ -705,14 +705,17 @@ pub enum Amount {
 	/// An amount of currency specified using ISO 4712.
 	Currency {
 		/// The currency that the amount is denominated in.
+		///
+		/// This is not exported to bindings users as bindings have troubles with type aliases to
+		/// byte arrays.
 		iso4217_code: CurrencyCode,
 		/// The amount in the currency unit adjusted by the ISO 4712 exponent (e.g., USD cents).
 		amount: u64,
 	},
 }
 
 /// An ISO 4712 three-letter currency code (e.g., USD).
-pub type CurrencyCode = [u8; 3];
+pub(crate) type CurrencyCode = [u8; 3];
 
 /// Quantity of items supported by an [`Offer`].
 #[derive(Clone, Copy, Debug, PartialEq)]
@@ -722,7 +725,8 @@ pub enum Quantity {
 	///
 	/// May be used with `NonZeroU64::new(1)` but prefer to use [`Quantity::One`] if only one item
 	/// is supported.
-	Bounded(NonZeroU64),
+	Bounded(/// This is not exported to bindings users as builder patterns don't map outside of move semantics.
+		NonZeroU64),
 	/// One or more items. Use when more than one item can be requested without any limit.
 	Unbounded,
 	/// Only one item. Use when only a single item can be requested.

lightning/src/offers/parse.rs

@@ -127,7 +127,8 @@ pub enum ParseError {
 	/// being parsed.
 	InvalidBech32Hrp,
 	/// The string could not be bech32 decoded.
-	Bech32(bech32::Error),
+	Bech32(/// This is not exported to bindings users as the details don't matter much
+		bech32::Error),
 	/// The bech32 decoded string could not be decoded as the expected message type.
 	Decode(DecodeError),
 	/// The parsed message has invalid semantics.