Make IdentityInfo generic in pallet-identity (#1661)

Fixes #179 

# Description

This PR makes the structure containing identity information used in
`pallet-identity` generic through the pallet `Config`. Additionally, the
old structure is now available in a separate module called `simple`
(pending rename) and is compatible with the new interface.

Another change in this PR is that while the `additional` field in
`IdentityInfo` stays for backwards compatibility reasons, the associated
costs are stil present in the pallet through the `additional` function
in the `IdentityInformationProvider` interface. This function is marked
as deprecated as it is only a temporary solution to the backwards
compatibility problem we had. In short, we could have removed the
additional fields in the struct and done a migration, but we chose to
wait and do it off-chain through the genesis of the system parachain.
After we move the identity pallet to the parachain, additional fields
will be migrated into the existing fields and the `additional` key-value
store will be removed. Until that happens, this interface will provide
the necessary information to properly account for the associated costs.

Additionally, this PR fixes an unrelated issue; the `IdentityField` enum
used to represent the fields as bitflags couldn't store more than 8
fields, even though it was marked as `#[repr(u64)]`. This was because of
the `derive` implementation of `TypeInfo`, which assumed `u8` semantics.
The custom implementation of this trait in
https://github.com/paritytech/polkadot-sdk/commit/0105cc0396b7a53d0b290f48b1225847f6d17321
fixes the issue.

---------

Signed-off-by: georgepisaltu <george.pisaltu@parity.io>
Co-authored-by: Sam Johnson <sam@durosoft.com>
Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

substrate/frame/identity/src/benchmarking.rs

@@ -22,6 +22,7 @@
 use super::*;
 
 use crate::Pallet as Identity;
+use enumflags2::BitFlag;
 use frame_benchmarking::{
 	account, impl_benchmark_test_suite, v2::*, whitelisted_caller, BenchmarkError,
 };
@@ -48,14 +49,9 @@ fn add_registrars<T: Config>(r: u32) -> Result<(), &'static str> {
 			.expect("RegistrarOrigin has no successful origin required for the benchmark");
 		Identity::<T>::add_registrar(registrar_origin, registrar_lookup)?;
 		Identity::<T>::set_fee(RawOrigin::Signed(registrar.clone()).into(), i, 10u32.into())?;
-		let fields =
-			IdentityFields(
-				IdentityField::Display |
-					IdentityField::Legal | IdentityField::Web |
-					IdentityField::Riot | IdentityField::Email |
-					IdentityField::PgpFingerprint |
-					IdentityField::Image | IdentityField::Twitter,
-			);
+		let fields = IdentityFields(
+			<T::IdentityInformation as IdentityInformationProvider>::IdentityField::all(),
+		);
 		Identity::<T>::set_fields(RawOrigin::Signed(registrar.clone()).into(), i, fields)?;
 	}
 
@@ -81,7 +77,7 @@ fn create_sub_accounts<T: Config>(
 	// Set identity so `set_subs` does not fail.
 	if IdentityOf::<T>::get(who).is_none() {
 		let _ = T::Currency::make_free_balance_be(who, BalanceOf::<T>::max_value() / 2u32.into());
-		let info = create_identity_info::<T>(1);
+		let info = T::IdentityInformation::create_identity_info(1);
 		Identity::<T>::set_identity(who_origin.into(), Box::new(info))?;
 	}
 
@@ -102,24 +98,6 @@ fn add_sub_accounts<T: Config>(
 	Ok(subs)
 }
 
-// This creates an `IdentityInfo` object with `num_fields` extra fields.
-// All data is pre-populated with some arbitrary bytes.
-fn create_identity_info<T: Config>(num_fields: u32) -> IdentityInfo<T::MaxAdditionalFields> {
-	let data = Data::Raw(vec![0; 32].try_into().unwrap());
-
-	IdentityInfo {
-		additional: vec![(data.clone(), data.clone()); num_fields as usize].try_into().unwrap(),
-		display: data.clone(),
-		legal: data.clone(),
-		web: data.clone(),
-		riot: data.clone(),
-		email: data.clone(),
-		pgp_fingerprint: Some([0; 20]),
-		image: data.clone(),
-		twitter: data,
-	}
-}
-
 #[benchmarks]
 mod benchmarks {
 	use super::*;
@@ -153,7 +131,7 @@ mod benchmarks {
 		let _ = T::Currency::make_free_balance_be(&caller, BalanceOf::<T>::max_value());
 
 		// Add an initial identity
-		let initial_info = create_identity_info::<T>(1);
+		let initial_info = T::IdentityInformation::create_identity_info(1);
 		Identity::<T>::set_identity(caller_origin.clone(), Box::new(initial_info.clone()))?;
 
 		// User requests judgement from all the registrars, and they approve
@@ -174,7 +152,10 @@ mod benchmarks {
 		}
 
 		#[extrinsic_call]
-		_(RawOrigin::Signed(caller.clone()), Box::new(create_identity_info::<T>(x)));
+		_(
+			RawOrigin::Signed(caller.clone()),
+			Box::new(T::IdentityInformation::create_identity_info(x)),
+		);
 
 		assert_last_event::<T>(Event::<T>::IdentitySet { who: caller }.into());
 		Ok(())
@@ -235,7 +216,7 @@ mod benchmarks {
 		let _ = add_sub_accounts::<T>(&caller, s)?;
 
 		// Create their main identity with x additional fields
-		let info = create_identity_info::<T>(x);
+		let info = T::IdentityInformation::create_identity_info(x);
 		Identity::<T>::set_identity(caller_origin.clone(), Box::new(info.clone()))?;
 
 		// User requests judgement from all the registrars, and they approve
@@ -275,7 +256,7 @@ mod benchmarks {
 		add_registrars::<T>(r)?;
 
 		// Create their main identity with x additional fields
-		let info = create_identity_info::<T>(x);
+		let info = T::IdentityInformation::create_identity_info(x);
 		let caller_origin =
 			<T as frame_system::Config>::RuntimeOrigin::from(RawOrigin::Signed(caller.clone()));
 		Identity::<T>::set_identity(caller_origin.clone(), Box::new(info))?;
@@ -302,7 +283,7 @@ mod benchmarks {
 		add_registrars::<T>(r)?;
 
 		// Create their main identity with x additional fields
-		let info = create_identity_info::<T>(x);
+		let info = T::IdentityInformation::create_identity_info(x);
 		let caller_origin =
 			<T as frame_system::Config>::RuntimeOrigin::from(RawOrigin::Signed(caller.clone()));
 		Identity::<T>::set_identity(caller_origin.clone(), Box::new(info))?;
@@ -386,14 +367,9 @@ mod benchmarks {
 			.expect("RegistrarOrigin has no successful origin required for the benchmark");
 		Identity::<T>::add_registrar(registrar_origin, caller_lookup)?;
 
-		let fields =
-			IdentityFields(
-				IdentityField::Display |
-					IdentityField::Legal | IdentityField::Web |
-					IdentityField::Riot | IdentityField::Email |
-					IdentityField::PgpFingerprint |
-					IdentityField::Image | IdentityField::Twitter,
-			);
+		let fields = IdentityFields(
+			<T::IdentityInformation as IdentityInformationProvider>::IdentityField::all(),
+		);
 
 		let registrars = Registrars::<T>::get();
 		ensure!(
@@ -431,7 +407,7 @@ mod benchmarks {
 
 		add_registrars::<T>(r)?;
 
-		let info = create_identity_info::<T>(x);
+		let info = T::IdentityInformation::create_identity_info(x);
 		let info_hash = T::Hashing::hash_of(&info);
 		Identity::<T>::set_identity(user_origin.clone(), Box::new(info))?;
 
@@ -464,7 +440,7 @@ mod benchmarks {
 		let target_lookup = T::Lookup::unlookup(target.clone());
 		let _ = T::Currency::make_free_balance_be(&target, BalanceOf::<T>::max_value());
 
-		let info = create_identity_info::<T>(x);
+		let info = T::IdentityInformation::create_identity_info(x);
 		Identity::<T>::set_identity(target_origin.clone(), Box::new(info.clone()))?;
 		let _ = add_sub_accounts::<T>(&target, s)?;