Directory Restructure (#1163)

* Move tests -> testing

* Directory restructure

* Update Cargo.toml during restructure

* Update Makefile during restructure

* Fix arbitrary path

crypto/eth2_wallet/src/json_wallet/mod.rs

@@ -0,0 +1,65 @@
+use serde::{Deserialize, Serialize};
+use serde_repr::*;
+use std::convert::TryFrom;
+
+pub use eth2_keystore::json_keystore::{
+    Aes128Ctr, ChecksumModule, Cipher, CipherModule, Crypto, EmptyMap, EmptyString, Kdf, KdfModule,
+    Scrypt, Sha256Checksum,
+};
+pub use uuid::Uuid;
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct JsonWallet {
+    pub crypto: Crypto,
+    pub name: String,
+    // TODO: confirm if this field is optional or not.
+    //
+    // Reference:
+    //
+    // https://github.com/sigp/lighthouse/pull/1117#discussion_r422892396
+    pub nextaccount: u32,
+    pub uuid: Uuid,
+    pub version: Version,
+    #[serde(rename = "type")]
+    pub type_field: TypeField,
+}
+
+/// Version for `JsonWallet`.
+#[derive(Debug, Clone, PartialEq, Serialize_repr, Deserialize_repr)]
+#[repr(u8)]
+pub enum Version {
+    V1 = 1,
+}
+
+impl Version {
+    pub fn one() -> Self {
+        Version::V1
+    }
+}
+
+/// Used for ensuring that serde only decodes valid checksum functions.
+#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
+#[serde(try_from = "String", into = "String")]
+pub enum TypeField {
+    Hd,
+}
+
+impl Into<String> for TypeField {
+    fn into(self) -> String {
+        match self {
+            TypeField::Hd => "hierarchical deterministic".into(),
+        }
+    }
+}
+
+impl TryFrom<String> for TypeField {
+    type Error = String;
+
+    fn try_from(s: String) -> Result<Self, Self::Error> {
+        match s.as_ref() {
+            "hierarchical deterministic" => Ok(TypeField::Hd),
+            other => Err(format!("Unsupported type function: {}", other)),
+        }
+    }
+}