faucet sc init commit

Cargo.toml

@@ -40,6 +40,8 @@ members = [
   "contracts/factorial/meta",
   "contracts/fair-launch",
   "contracts/fair-launch/meta",
+  "contracts/faucet",
+  "contracts/faucet/meta",
   "contracts/fractional-nfts",
   "contracts/fractional-nfts/meta",
   "contracts/lottery-esdt",

contracts/faucet/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "faucet"
+version = "0.0.0"
+publish = false
+edition = "2021"
+authors = ["you"]
+
+[lib]
+path = "src/faucet.rs"
+
+[dependencies.multiversx-sc]
+version = "0.53.2"
+
+[dependencies.multiversx-sc-modules]
+version = "0.53.2"
+
+[dev-dependencies.multiversx-sc-scenario]
+version = "0.53.2"

contracts/faucet/meta/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "faucet-meta"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[dependencies.faucet]
+path = ".."
+
+[dependencies.multiversx-sc-meta-lib]
+version = "0.53.2"
+default-features = false

contracts/faucet/meta/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    multiversx_sc_meta_lib::cli_main::<faucet::AbiProvider>();
+}

contracts/faucet/multiversx.json

@@ -0,0 +1,3 @@
+{
+    "language": "rust"
+}

contracts/faucet/src/faucet.rs

@@ -0,0 +1,73 @@
+#![no_std]
+
+#[allow(unused_imports)]
+use multiversx_sc::{derive_imports::*, imports::*};
+
+pub type Signature<M> = ManagedByteArray<M, ED25519_SIGNATURE_BYTE_LEN>;
+pub const ED25519_SIGNATURE_BYTE_LEN: usize = 64;
+
+/// An empty contract. To be used as a template when starting a new contract from scratch.
+#[multiversx_sc::contract]
+pub trait Faucet {
+    #[init]
+    fn init(&self) {}
+
+    #[upgrade]
+    fn upgrade(&self) {}
+
+    #[only_owner]
+    #[payable("*")]
+    #[endpoint(deposit)]
+    fn deposit(&self, max_users: u64) {
+        let payments = self.call_value().all_esdt_transfers();
+        for payment in payments.iter() {
+            let amount_per_user = payment.amount / max_users;
+            self.payments().push( &EsdtTokenPayment::new(payment.token_identifier, payment.token_nonce, amount_per_user));
+        }
+    }
+
+    #[endpoint(claim)]
+    fn claim(&self, signature: &Signature<Self::Api>) {
+        let caller = self.blockchain().get_caller();
+        let claimers_mapper = self.claimers();
+        require!(!claimers_mapper.contains(&caller), "Caller already claimed");
+
+        self.verify_signature(&caller, signature);
+        self.claimers().add(&caller);
+
+        let mut payments = ManagedVec::new();
+        for payment in self.payments().iter() {
+            payments.push(payment);
+        }
+
+        self.tx().to(ToCaller).with_multi_token_transfer(payments).transfer();
+    }
+
+    fn verify_signature(
+        &self, 
+        caller: &ManagedAddress<Self::Api>,
+        signature: &Signature<Self::Api>,
+    ) {
+        let signer = self.signer().get();
+        self.crypto().verify_ed25519(
+            signer.as_managed_buffer(),
+            caller.as_managed_buffer(),
+            signature.as_managed_buffer(),
+        );
+    }
+
+    #[only_owner]
+    #[endpoint(setSigner)]
+    fn set_signer(&self, signer: ManagedAddress<Self::Api>) {
+        self.signer().set(&signer);
+    }
+
+    #[storage_mapper("payments")]
+    fn payments(&self) -> VecMapper<EsdtTokenPayment<Self::Api>>;
+
+    #[storage_mapper("signer")]
+    fn signer(&self) -> SingleValueMapper<ManagedAddress<Self::Api>>;
+
+    #[storage_mapper("claimers")]
+    fn claimers(&self) -> WhitelistMapper<ManagedAddress<Self::Api>>;
+}

contracts/faucet/wasm/Cargo.toml

@@ -0,0 +1,34 @@
+# Code generated by the multiversx-sc build system. DO NOT EDIT.
+
+# ##########################################
+# ############## AUTO-GENERATED #############
+# ##########################################
+
+[package]
+name = "faucet-wasm"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[profile.release]
+codegen-units = 1
+opt-level = "z"
+lto = true
+debug = false
+panic = "abort"
+overflow-checks = false
+
+[profile.dev]
+panic = "abort"
+
+[dependencies.faucet]
+path = ".."
+
+[dependencies.multiversx-sc-wasm-adapter]
+version = "0.53.2"
+
+[workspace]
+members = ["."]