chore: add sign_functioncall_str example

Cargo.toml

@@ -67,6 +67,9 @@ path = "examples/sign_transaction/add_key_functioncall.rs"
 name = "sign_deploy_contract"
 path = "examples/sign_transaction/deploy_contract.rs"
 
+[[example]]
+name = "sign_functioncall_str"
+path = "examples/sign_transaction/functioncall_str.rs"
 
 [[example]]
 name = "blind_sign_transaction"

README.md

@@ -153,6 +153,12 @@ RUST_LOG=sign_add_key_functioncall,near_ledger=info cargo run --example sign_add
 RUST_LOG=sign_deploy_contract,near_ledger=info cargo run --example sign_deploy_contract
 ```
 
+#### Function call (string arg)
+
+```bash
+RUST_LOG=sign_functioncall_str,near_ledger=info cargo run --example sign_functioncall_str
+```
+
 #### Transfer
 
 ```bash

examples/sign_transaction/functioncall_str.rs

@@ -0,0 +1,28 @@
+use near_ledger::NEARLedgerError;
+use near_primitives::transaction::FunctionCallAction;
+
+#[path = "../common/lib.rs"]
+mod common;
+
+fn tx(ledger_pub_key: ed25519_dalek::PublicKey) -> near_primitives::transaction::Transaction {
+    let mut tx = common::tx_template(ledger_pub_key.clone());
+
+    let args = r#"{"previous_vesting_schedule_with_salt":{"vesting_schedule":{"start_timestamp":"1577919600000000000","cliff_timestamp":"1609455600000000000","end_timestamp":"1704150000000000000"},"salt":"7bc709c22801118b743fae3866edb4dea1630a97ab9cd67e993428b94a0f397a"}, "vesting_schedule_with_salt":{"vesting_schedule":{"start_timestamp":"1577919600000000000","cliff_timestamp":"1609455600000000000","end_timestamp":"1704150000000000000"},"salt":"7bc709c22801118b743fae3866edb4dea1630a97ab9cd67e993428b94a0f397a"}}"#;
+
+    let f_call = FunctionCallAction {
+        method_name: "saturating_add_signed".to_string(),
+        args: args.as_bytes().to_vec(),
+        gas: 127127122121,
+        deposit: 150000000000000000000000, // 0.15 NEAR,
+    };
+
+    tx.actions = vec![near_primitives::transaction::Action::FunctionCall(
+        Box::new(f_call),
+    )];
+    tx
+}
+
+fn main() -> Result<(), NEARLedgerError> {
+    common::get_key_sign_and_verify_flow(tx)?;
+    Ok(())
+}