referrerpolicy=no-referrer-when-downgrade
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
// Copyright (C) Parity Technologies (UK) Ltd.
// This file is part of Polkadot.

// Polkadot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Polkadot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.

//! Declaration of the parachain specific origin and a pallet that hosts it.

use core::result;
use polkadot_primitives::Id as ParaId;
use sp_runtime::traits::BadOrigin;

pub use pallet::*;

/// Ensure that the origin `o` represents a parachain.
/// Returns `Ok` with the parachain ID that effected the extrinsic or an `Err` otherwise.
pub fn ensure_parachain<OuterOrigin>(o: OuterOrigin) -> result::Result<ParaId, BadOrigin>
where
	OuterOrigin: Into<result::Result<Origin, OuterOrigin>>,
{
	match o.into() {
		Ok(Origin::Parachain(id)) => Ok(id),
		_ => Err(BadOrigin),
	}
}

/// There is no way to register an origin type in `construct_runtime` without a pallet the origin
/// belongs to.
///
/// This module fulfills only the single purpose of housing the `Origin` in `construct_runtime`.
// ideally, though, the `construct_runtime` should support a free-standing origin.
#[frame_support::pallet]
pub mod pallet {
	use super::*;
	use frame_support::pallet_prelude::*;

	#[pallet::pallet]
	pub struct Pallet<T>(_);

	#[pallet::config]
	pub trait Config: frame_system::Config {}

	/// Origin for the parachains.
	#[pallet::origin]
	#[derive(
		PartialEq,
		Eq,
		Clone,
		Encode,
		Decode,
		sp_core::RuntimeDebug,
		scale_info::TypeInfo,
		MaxEncodedLen,
	)]
	pub enum Origin {
		/// It comes from a parachain.
		Parachain(ParaId),
	}
}

impl From<u32> for Origin {
	fn from(id: u32) -> Origin {
		Origin::Parachain(id.into())
	}
}