feat(native): split package (#8853)

packages/backend/native/src/hashcash.rs

@@ -1 +0,0 @@
-../../../frontend/native/src/hashcash.rs

packages/backend/native/src/hashcash.rs

@@ -0,0 +1,69 @@
+use std::convert::TryFrom;
+
+use affine_common::hashcash::Stamp;
+use napi::{bindgen_prelude::AsyncTask, Env, JsBoolean, JsString, Result as NapiResult, Task};
+use napi_derive::napi;
+
+pub struct AsyncVerifyChallengeResponse {
+  response: String,
+  bits: u32,
+  resource: String,
+}
+
+#[napi]
+impl Task for AsyncVerifyChallengeResponse {
+  type Output = bool;
+  type JsValue = JsBoolean;
+
+  fn compute(&mut self) -> NapiResult<Self::Output> {
+    Ok(if let Ok(stamp) = Stamp::try_from(self.response.as_str()) {
+      stamp.check(self.bits, &self.resource)
+    } else {
+      false
+    })
+  }
+
+  fn resolve(&mut self, env: Env, output: bool) -> NapiResult<Self::JsValue> {
+    env.get_boolean(output)
+  }
+}
+
+#[napi]
+pub fn verify_challenge_response(
+  response: String,
+  bits: u32,
+  resource: String,
+) -> AsyncTask<AsyncVerifyChallengeResponse> {
+  AsyncTask::new(AsyncVerifyChallengeResponse {
+    response,
+    bits,
+    resource,
+  })
+}
+
+pub struct AsyncMintChallengeResponse {
+  bits: Option<u32>,
+  resource: String,
+}
+
+#[napi]
+impl Task for AsyncMintChallengeResponse {
+  type Output = String;
+  type JsValue = JsString;
+
+  fn compute(&mut self) -> NapiResult<Self::Output> {
+    Ok(Stamp::mint(self.resource.clone(), self.bits).format())
+  }
+
+  fn resolve(&mut self, env: Env, output: String) -> NapiResult<Self::JsValue> {
+    env.create_string(&output)
+  }
+}
+
+#[napi]
+pub fn mint_challenge_response(
+  resource: String,
+  bits: Option<u32>,
+) -> AsyncTask<AsyncMintChallengeResponse> {
+  AsyncTask::new(AsyncMintChallengeResponse { bits, resource })
+}