Expand remote keystore interface to allow for hybrid mode (#7628)

* update to latest master

* updates on docs, license, meta

* hide ssrs behind feature flag

* implement remaining functions on the server

* sign server line length fix

* fix tests

* fixup in-memory-keystore

* adding failsafe

* skipping ecdsa test for now

* remote keystore param

* remote sign urls made available

* integrating keystore remotes features

* don't forget the dependency

* remove old cruft

* reset local keystore

* applying suggestions

* Switch to single remote, minor grumbles

* minor grumbles, docs

substrate/primitives/keystore/Cargo.toml

@@ -20,10 +20,19 @@ futures = { version = "0.3.1" }
 schnorrkel = { version = "0.9.1", features = ["preaudit_deprecated", "u64_backend"], default-features = false }
 merlin = { version = "2.0", default-features = false }
 parking_lot = { version = "0.10.0", default-features = false }
-
+serde = { version = "1.0", optional = true}
 sp-core = { version = "2.0.0", path = "../core" }
 sp-externalities = { version = "0.8.0", path = "../externalities", default-features = false }
 
 [dev-dependencies]
 rand = "0.7.2"
 rand_chacha = "0.2.2"
+
+
+[features]
+default = ["std"]
+std = [
+	"serde",
+	"schnorrkel/std",
+	"schnorrkel/serde",
+]

substrate/primitives/keystore/src/vrf.rs

@@ -20,9 +20,11 @@
 use codec::Encode;
 use merlin::Transcript;
 use schnorrkel::vrf::{VRFOutput, VRFProof};
+
 /// An enum whose variants represent possible
 /// accepted values to construct the VRF transcript
 #[derive(Clone, Encode)]
+#[cfg_attr(feature = "std", derive(serde::Serialize, serde::Deserialize))]
 pub enum VRFTranscriptValue {
 	/// Value is an array of bytes
 	Bytes(Vec<u8>),
@@ -38,6 +40,7 @@ pub struct VRFTranscriptData {
 	pub items: Vec<(&'static str, VRFTranscriptValue)>,
 }
 /// VRF signature data
+#[cfg_attr(feature = "std", derive(serde::Serialize, serde::Deserialize))]
 pub struct VRFSignature {
 	/// The VRFOutput serialized
 	pub output: VRFOutput,