accept only ct decimals from 4 to 20

pallets/funding/src/tests/1_application.rs

@@ -557,6 +557,44 @@ mod create_project_extrinsic {
 				);
 			});
 		}
+
+		#[test]
+		fn unaccepted_ct_decimals() {
+			let mut inst = MockInstantiator::new(Some(RefCell::new(new_test_ext())));
+			let mut project_metadata = default_project_metadata(ISSUER_1);
+
+			inst.mint_plmc_to(default_plmc_balances());
+			let jwt = get_mock_jwt_with_cid(
+				ISSUER_1,
+				InvestorType::Institutional,
+				generate_did_from_account(ISSUER_1),
+				project_metadata.clone().policy_ipfs_cid.unwrap(),
+			);
+
+			let mut fail_with_decimals = |decimals: u8| {
+				project_metadata.token_information.decimals = decimals;
+
+				inst.execute(|| {
+					assert_noop!(
+						Pallet::<TestRuntime>::create_project(
+							RuntimeOrigin::signed(ISSUER_1),
+							jwt.clone(),
+							project_metadata.clone()
+						),
+						Error::<TestRuntime>::BadMetadata(MetadataError::BadDecimals)
+					);
+				});
+			};
+
+			// less than 5 should fail
+			for i in 0..=4 {
+				fail_with_decimals(i);
+			}
+			// more than 20 should fail
+			for i in 21..30 {
+				fail_with_decimals(i);
+			}
+		}
 	}
 }
 

pallets/funding/src/types.rs

@@ -244,6 +244,10 @@ pub mod storage_types {
 			if target_funding < (1000u64 * 10u64.pow(USD_DECIMALS.into())).into() {
 				return Err(MetadataError::FundingTargetTooLow);
 			}
+
+			if self.token_information.decimals < 5 || self.token_information.decimals > 20 {
+				return Err(MetadataError::BadDecimals);
+			}
 			Ok(())
 		}
 	}
@@ -758,6 +762,8 @@ pub mod inner_types {
 		FundingTargetTooLow,
 		/// The project's metadata hash is not provided while starting the evaluation round.
 		CidNotProvided,
+		/// The ct decimals specified for the CT is outside the 4 to 20 range.
+		BadDecimals,
 	}
 
 	/// Errors related to the project's migration process.