implement pairing storage

src/app/keycard/core.nim

@@ -1,6 +1,6 @@
 import NimQml, chronicles, std/wrapnils
 import status/[signals, status, keycard]
-import view
+import view, pairing
 
 logScope:
   topics = "keycard-model"
@@ -24,6 +24,12 @@ proc reset*(self: KeycardController) =
   discard
 
 proc attemptOpenSecureChannel(self: KeycardController) : bool =
+  let pairing = self.view.pairings.getPairing(self.view.appInfo.instanceUID)
+
+  if pairing == "":
+    return false
+
+  # actually open secure channel
   return false
 
 proc getCardState(self: KeycardController) =

src/app/keycard/pairing.nim

@@ -0,0 +1,30 @@
+import json, os, std/wrapnils
+
+import ../../constants
+
+let PAIRINGSTORE = joinPath(DATADIR, "keycard-pairings.json")
+
+type KeycardPairingController* = ref object
+  store: JsonNode
+
+proc newPairingController*(): KeycardPairingController =
+  result = KeycardPairingController()
+  if fileExists(PAIRINGSTORE):
+    result.store = parseJSON(readFile(PAIRINGSTORE))
+  else:
+    result.store = %*{}
+
+proc save(self: KeycardPairingController) =
+  writeFile(PAIRINGSTORE, $self.store)
+
+proc addPairing*(self: KeycardPairingController, instanceUID: string, pairing: string) =
+  self.store[instanceUID] = %* pairing
+  self.save()
+
+proc removePairing*(self: KeycardPairingController, instanceUID: string) =
+  self.store.delete(instanceUID)
+  self.save()
+
+proc getPairing*(self: KeycardPairingController, instanceUID: string): string =
+  let node = self.store{instanceUID}
+  return ?.node.getStr()

src/app/keycard/view.nim

@@ -1,6 +1,7 @@
 import NimQml, chronicles
 import status/[status, keycard]
 import status/types/keycard as keycardtypes
+import pairing
 
 logScope:
   topics = "keycard-model"
@@ -20,6 +21,7 @@ type
 QtObject:
   type KeycardView* = ref object of QObject
     status*: Status
+    pairings*: KeycardPairingController
     cardState*: CardState
     appInfo*: KeycardApplicationInfo
 
@@ -32,6 +34,7 @@ QtObject:
   proc newKeycardView*(status: Status): KeycardView =
     new(result, delete)
     result.status = status
+    result.pairings = newPairingController()
     result.setup
 
   proc cardConnected*(self: KeycardView) {.signal.}