Prevent submitting calls to messages marked as immutable

CHANGELOG.md

@@ -20,6 +20,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Remove check for compatible `scale` and `scale-info` versions - [#1370](https://github.com/paritytech/cargo-contract/pull/1370)
 - Add workspace support -[#1358](https://github.com/paritytech/cargo-contract/pull/1358)
 
+### Fixed
+- Do not allow to execute calls on immutable contract messages - [#1397](https://github.com/paritytech/cargo-contract/pull/1397)
+
 ## [4.0.0-alpha]
 
 Replaces the yanked `3.1.0` due to issues with supporting *both* Rust versions < `1.70`

crates/extrinsics/src/call.rs

@@ -267,6 +267,23 @@ impl CallExec {
         &self,
         gas_limit: Option<Weight>,
     ) -> Result<DisplayEvents, ErrorVariant> {
+        if !self
+            .transcoder()
+            .metadata()
+            .spec()
+            .messages()
+            .iter()
+            .find(|msg| msg.label() == &self.message)
+            .expect("message exist after calling CallExec::done()")
+            .mutates()
+        {
+            let inner = anyhow!(
+                "Tried to execute a call on the immutable contract message '{}'. Please do a dry-run instead.",
+                &self.message
+            );
+            return Err(inner.into());
+        }
+
         // use user specified values where provided, otherwise estimate
         let gas_limit = match gas_limit {
             Some(gas_limit) => gas_limit,

crates/extrinsics/src/integration_tests.rs

@@ -96,14 +96,14 @@ impl ContractsNodeProcess {
             );
             let result = OnlineClient::new().await;
             if let Ok(client) = result {
-                break Ok(client)
+                break Ok(client);
             }
             if attempts < MAX_ATTEMPTS {
                 attempts += 1;
-                continue
+                continue;
             }
             if let Err(err) = result {
-                break Err(err)
+                break Err(err);
             }
         };
         match client {
@@ -509,6 +509,13 @@ async fn api_build_upload_instantiate_call() {
         .to_string();
     assert!(value.contains("true"), "{:#?}", value);
 
+    // call the contract on the immutable "get" message trying to execute
+    // this should fail because "get" is immutable
+    match call.call(None).await {
+        Err(crate::ErrorVariant::Generic(_)) => {}
+        _ => panic!("immutable call was not prevented"),
+    }
+
     // call the contract
     // flip the value
     let call = CallCommandBuilder::default()