feat(SNM): Install `waku exportHandshake` command

src/status_node_manager.nim

@@ -81,6 +81,12 @@ proc doWakuPairing(config: StatusNodeManagerConfig,
 
   waitFor wakuPair(wakuClient, wakuPairRequestData)
 
+proc doWakuHandshakeExport(config: StatusNodeManagerConfig,
+                           wakuClient: var RestClientRef) =
+  let requestData =
+    WakuExportHandshakeRequestData(exportFile: $config.handshakeFile)
+  waitFor wakuExportHandshake(wakuClient, requestData)
+
 proc doWakuCommand(config: StatusNodeManagerConfig, rng: ref HmacDrbgContext) =
   var wakuClient = RestClientRef.new(initTAddress(config.restAddress,
                                                   config.restPort))
@@ -88,7 +94,7 @@ proc doWakuCommand(config: StatusNodeManagerConfig, rng: ref HmacDrbgContext) =
   of WakuCommand.pair:
     doWakuPairing(config, rng, wakuClient)
   of WakuCommand.exportHandshake:
-    discard
+    doWakuHandshakeExport(config, wakuClient)
 
 when isMainModule:
   setupLogLevel(LogLevel.NOTICE)

src/status_node_manager/config.nim

@@ -12,6 +12,7 @@ export
   defaultSNMRestPort, defaultAdminListenAddress,
   parseCmdArg, completeCmdArg, `/`
 
+const wakuHandshakeDataFilename* = "handshake_data.json"
 
 type
   SNMStartUpCmd* {.pure.} = enum
@@ -104,7 +105,10 @@ type
           name: "pubsub-topic" .}: PubsubTopic
 
       of WakuCommand.exportHandshake:
-        discard
+        handshakeFile* {.
+          desc: "The file to export the waku handshake result to"
+          defaultValue: config.defaultDataDir() / "waku" / wakuHandshakeDataFilename
+          name: "handshake-file" .}: OutFile
 
 proc defaultDataDir*[Conf](config: Conf): string =
   let dataDir = when defined(windows):