Add LocalContent call to Portal JSON-RPC API (#1383)

fluffy/rpc/rpc_calls/rpc_portal_calls.nim

@@ -20,6 +20,7 @@ proc portal_stateOffer(contentKey: string, contentValue: string): int
 proc portal_stateRecursiveFindNodes(nodeId: NodeId): seq[Record]
 proc portal_stateRecursiveFindContent(contentKey: string): string
 proc portal_stateStore(contentKey: string, contentValue: string): bool
+proc portal_stateLocalContent(contentKey: string): string
 
 ## Portal History Network json-rpc calls
 proc portal_historyNodeInfo(): NodeInfo
@@ -43,3 +44,4 @@ proc portal_historyOffer(contentKey: string, contentValue: string): int
 proc portal_historyRecursiveFindNodes(nodeId: NodeId): seq[Record]
 proc portal_historyRecursiveFindContent(contentKey: string): string
 proc portal_historyStore(contentKey: string, contentValue: string): bool
+proc portal_historyLocalContent(contentKey: string): string

fluffy/rpc/rpc_portal_api.nim

@@ -205,3 +205,16 @@ proc installPortalApiHandlers*(
       return true
     else:
       raise newException(ValueError, "Invalid content key")
+
+  rpcServer.rpc("portal_" & network & "LocalContent") do(
+      contentKey: string) -> string:
+    let
+      key = ByteList.init(hexToSeqByte(contentKey))
+      contentId = p.toContentId(key).valueOr:
+        raise newException(ValueError, "Invalid content key")
+
+    let contentResult = p.dbGet(key, contentId)
+    if contentResult.isOk():
+      return contentResult.get().toHex()
+    else:
+      return "0x0"