Account migration signer tool (#235)

* Doc

* Bump version for devnet

* Account migration signer tool

* Doc

pallet/account-migration/src/lib.rs

@@ -334,7 +334,11 @@ pub enum ExistenceReason {
 /// Build a Darwinia account migration message.
 pub fn sr25519_signable_message(spec_name: &[u8], account_id_20: &AccountId20) -> Vec<u8> {
 	[
+		// https://github.com/polkadot-js/common/issues/1710
 		b"<Bytes>I authorize the migration to ",
+		// Ignore the EIP-55 here.
+		//
+		// Must call the `to_lowercase` on front end.
 		array_bytes::bytes2hex("0x", account_id_20.0).as_bytes(),
 		b", an unused address on ",
 		spec_name,

runtime/pangolin/src/lib.rs

@@ -100,7 +100,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: sp_runtime::create_runtime_str!("Pangolin2"),
 	impl_name: sp_runtime::create_runtime_str!("DarwiniaOfficialRust"),
 	authoring_version: 0,
-	spec_version: 6_0_0_1,
+	spec_version: 6_0_0_2,
 	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
 	transaction_version: 0,

tool/am-signer/.editorconfig

@@ -0,0 +1,21 @@
+root = true
+
+[*]
+charset=utf-8
+end_of_line=lf
+indent_size=tab
+indent_style=tab
+insert_final_newline=true
+max_line_length=100
+tab_width=4
+trim_trailing_whitespace=true
+
+[*.py]
+charset=utf-8
+indent_size=4
+indent_style=space
+
+[*.{sh,yml,yaml}]
+indent_size=2
+indent_style=space
+tab_width=8

tool/am-signer/.gitignore

@@ -0,0 +1,15 @@
+# System
+.DS_Store
+
+# Integrated Development Environment
+.idea
+.vscode
+
+# Package Manager
+## cargo
+target
+## npm
+node_modules
+
+# Test data
+test-data

tool/am-signer/.rustfmt.toml

@@ -0,0 +1,29 @@
+# Basic
+edition    = "2021"
+hard_tabs  = true
+max_width  = 100
+tab_spaces = 4
+
+# Imports
+imports_granularity = "Crate"
+reorder_imports     = true
+
+# Format comments
+comment_width = 100
+wrap_comments = true
+
+# Misc
+match_arm_blocks           = false
+match_block_trailing_comma = true
+newline_style              = "Unix"
+reorder_impl_items         = true
+reorder_modules            = true
+use_field_init_shorthand   = true
+use_small_heuristics       = "Max"
+
+# Wait for stablization
+# format_code_in_doc_comments = true
+
+# Could give it a try
+# group_imports          = "StdExternalCrate"
+# inline_attribute_width = 100