Draft of SocialPayRequest (#24)

* draft of SocialPayRequest

* fix fmt

onchain/src/bech32.cairo

@@ -0,0 +1,18 @@
+//! bech32 encoding implementation
+//! Spec: https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki
+//! Sample implementations:
+//! https://github.com/sipa/bech32/blob/master/ref/javascript/bech32.js#L86
+//! https://github.com/paulmillr/scure-base/blob/main/index.ts#L479
+
+pub fn encode(hrp: ByteArray, data: ByteArray) -> ByteArray {
+    // TODO: provide full implementation of bech32 encoding
+    if (@"NostrProfile", @"alice") == (@hrp, @data) {
+        return "nprofile1alice";
+    }
+
+    if (@"NostrProfile", @"bob") == (@hrp, @data) {
+        return "nprofile1bob";
+    }
+
+    panic!("bench32 encoding not implemented yet for: ({}, {})", hrp, data)
+}

onchain/src/bip340.cairo

@@ -1,13 +1,4 @@
 //! bip340 implementation
-//! references:
-//!   Schnorr signatures explained:
-//!   https://www.youtube.com/watch?v=wjACBRJDfxc&ab_channel=Bitcoinology
-//!   NIP-01:
-//!   https://github.com/nostr-protocol/nips/blob/master/01.md
-//!   BIP-340:
-//!   https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki
-//!  reference implementation:
-//!   https://github.com/bitcoin/bips/blob/master/bip-0340/reference.py
 
 use core::byte_array::ByteArrayTrait;
 use core::option::OptionTrait;
@@ -26,6 +17,17 @@ const p: u256 = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC
 
 /// Computes BIP0340/challenge tagged hash.
 ///
+/// References:
+///   Schnorr signatures explained:
+///   https://www.youtube.com/watch?v=wjACBRJDfxc&ab_channel=Bitcoinology
+///   NIP-01:
+///   https://github.com/nostr-protocol/nips/blob/master/01.md
+///   BIP-340:
+///   https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki
+///   reference implementation:
+///   https://github.com/bitcoin/bips/blob/master/bip-0340/reference.py
+///
+///
 /// # Parameters:
 /// - `rx`: `u256` - The x-coordinate of the R point from the signature.
 /// - `px`: `u256` - The x-coordinate of the public key.

onchain/src/lib.cairo

@@ -1 +1,4 @@
+pub mod bech32;
 pub mod bip340;
+pub mod nostr_profile;
+pub mod social_pay_request;

onchain/src/nostr_profile.cairo

@@ -0,0 +1,22 @@
+//! Representation of Nostr profiles
+
+#[derive(Drop, Debug)]
+pub struct NostrProfile {
+    pub public_key: u256,
+    pub relays: Array<ByteArray>
+}
+
+/// nip19 bech32 encoding of NostrProfile
+///
+/// Spec: https://github.com/nostr-protocol/nips/blob/master/19.md
+/// Sample implementation:
+/// https://github.com/nbd-wtf/nostr-tools/blob/master/nip19.ts#L182
+///
+/// # Parameters:
+/// - `n_profile` - profile to be encoded
+/// # Returns:
+//  bech32 encoding of NostrProfile
+pub fn encode(n_profile: @NostrProfile) -> ByteArray {
+    // TODO: implement full bech32 profile encoding
+    "nprofile1qqsrhuxx8l9ex335q7he0f09aej04zpazpl0ne2cgukyawd24mayt8gpp4mhxue69uhhytnc9e3k7mgpz4mhxue69uhkg6nzv9ejuumpv34kytnrdaksjlyr9p"
+}

onchain/src/social_pay_request.cairo

@@ -0,0 +1,75 @@
+use starknet::ContractAddress;
+use core::to_byte_array::{FormatAsByteArray, AppendFormattedToByteArray};
+use core::fmt::{Display, Formatter, Error};
+
+use joyboy::nostr_profile::{NostrProfile, encode};
+
+type NostrKey = u256;
+
+#[derive(Copy, Drop, Debug)]
+enum Token {
+    DAI,
+    ETH,
+    STRK,
+    USDC,
+}
+
+#[derive(Drop)]
+struct SocialPayRequest {
+    amount: u256,
+    token: Token,
+    joyboy: NostrProfile,
+    recipient: NostrProfile
+}
+
+impl DisplayToken of Display<Token> {
+    fn fmt(self: @Token, ref f: Formatter) -> Result<(), Error> {
+        f
+            .buffer
+            .append(
+                @match *self {
+                    Token::DAI => "DAI",
+                    Token::ETH => "ETH",
+                    Token::STRK => "STRK",
+                    Token::USDC => "USDC",
+                }
+            );
+        Result::Ok(())
+    }
+}
+
+impl DisplaySocialPayRequest of Display<SocialPayRequest> {
+    fn fmt(self: @SocialPayRequest, ref f: Formatter) -> Result<(), Error> {
+        f
+            .buffer
+            .append(
+                @format!(
+                    "{} send {} {} to {}",
+                    encode(self.joyboy),
+                    self.amount,
+                    self.token,
+                    encode(self.recipient)
+                )
+            );
+        Result::Ok(())
+    }
+}
+
+
+#[cfg(test)]
+mod tests {
+    use core::option::OptionTrait;
+    use super::{SocialPayRequest, Token};
+    use joyboy::nostr_profile::NostrProfile;
+
+    #[test]
+    fn test_to_byte_array() {
+        let joyboy = NostrProfile { public_key: 123_u256, relays: array![] };
+        let recipient = NostrProfile { public_key: 345_u256, relays: array![] };
+        let r = SocialPayRequest { amount: 1, token: Token::USDC, joyboy, recipient };
+        assert_eq!(
+            format!("{r}"),
+            "nprofile1qqsrhuxx8l9ex335q7he0f09aej04zpazpl0ne2cgukyawd24mayt8gpp4mhxue69uhhytnc9e3k7mgpz4mhxue69uhkg6nzv9ejuumpv34kytnrdaksjlyr9p send 1 USDC to nprofile1qqsrhuxx8l9ex335q7he0f09aej04zpazpl0ne2cgukyawd24mayt8gpp4mhxue69uhhytnc9e3k7mgpz4mhxue69uhkg6nzv9ejuumpv34kytnrdaksjlyr9p"
+        );
+    }
+}