feat: create pro backend wrapper for getting pro proofs

include/pro/pro.hpp

@@ -9,6 +9,7 @@
 #include "../meta/meta_base_wrapper.hpp"
 #include "../utilities.hpp"
 #include "meta/meta_base_wrapper.hpp"
+#include "session/pro_backend.hpp"
 #include "session/session_protocol.hpp"
 
 namespace session::nodeapi {
@@ -31,6 +32,10 @@ class ProWrapper : public Napi::ObjectWrap<ProWrapper> {
                                 "proFeaturesForMessage",
                                 static_cast<napi_property_attributes>(
                                         napi_writable | napi_configurable)),
+                        StaticMethod<&ProWrapper::proProofRequestBody>(
+                                "proProofRequestBody",
+                                static_cast<napi_property_attributes>(
+                                        napi_writable | napi_configurable)),
                 });
     }
 
@@ -89,6 +94,53 @@ class ProWrapper : public Napi::ObjectWrap<ProWrapper> {
             return obj;
         });
     };
+
+    static Napi::Value proProofRequestBody(const Napi::CallbackInfo& info) {
+        return wrapResult(info, [&] {
+            // we expect arguments that match:
+            // first: {
+            //   "requestVersion": string,
+            //   "masterPrivkey": Uint8Array,
+            //   "rotatingPrivkey": Uint8Array,
+            //   "unixTsMs": number,
+            // }
+
+            assertInfoLength(info, 1);
+            assertIsObject(info[0]);
+            auto env = info.Env();
+
+            auto first = info[0].As<Napi::Object>();
+
+            if (first.IsEmpty())
+                throw std::invalid_argument("proProofRequestBody first received empty");
+
+            assertIsNumber(first.Get("requestVersion"), "proProofRequestBody.requestVersion");
+            assertIsNumber(first.Get("unixTsMs"), "proProofRequestBody.unixTsMs");
+            auto requestVersion = first.Get("requestVersion").As<Napi::Number>();
+            auto unix_ts_ms = toCppSysMs(first.Get("unixTsMs"), "proProofRequestBody.unixTsMs");
+
+            assertIsUInt8Array(first.Get("masterPrivkey"), "proProofRequestBody.masterPrivkey");
+            assertIsUInt8Array(first.Get("rotatingPrivkey"), "proProofRequestBody.rotatingPrivkey");
+
+            auto master_privkey_js = first.Get("masterPrivkey");
+            auto rotating_privkey_js = first.Get("rotatingPrivkey");
+            auto master_privkey =
+                    toCppBuffer(master_privkey_js, "proProofRequestBody.masterPrivkey");
+            auto rotating_privkey =
+                    toCppBuffer(rotating_privkey_js, "proProofRequestBody.rotatingPrivkey");
+
+            assert_length(master_privkey, 64, "master_privkey");
+            assert_length(rotating_privkey, 64, "rotating_prevkey");
+
+            auto json = pro_backend::GetProProofRequest::build_to_json(
+                    static_cast<uint8_t>(requestVersion.Int32Value()),
+                    master_privkey,
+                    rotating_privkey,
+                    unix_ts_ms);
+
+            return json;
+        });
+    };
 };
 
 };  // namespace session::nodeapi

include/utilities.hpp

@@ -60,6 +60,7 @@ auto getStringArgs(const Napi::CallbackInfo& info) {
 }
 
 std::string toCppString(Napi::Value x, const std::string& identifier);
+std::span<const unsigned char> toCppBufferView(Napi::Value x, const std::string& identifier);
 std::vector<unsigned char> toCppBuffer(Napi::Value x, const std::string& identifier);
 
 int64_t toCppInteger(Napi::Value x, const std::string& identifier, bool allowUndefined = false);

types/pro/pro.d.ts

@@ -74,9 +74,16 @@ declare module 'libsession_util_nodejs' {
        */
       proFeatures: ProFeatures;
     }) => WithProFeatures & { success: boolean; error: string | null; codepointCount: number };
+    proProofRequestBody: (args: {
+      requestVersion: string,
+      masterPrivkey: Uint8Array,
+      rotatingPrivkey: Uint8Array,
+      unixTsMs: number,
+    }
+    ) => string;
   };
 
-    export type ProActionsCalls = MakeWrapperActionCalls<ProWrapper>;
+  export type ProActionsCalls = MakeWrapperActionCalls<ProWrapper>;
 
 
   /**