From 5ddc38cb33d2197b4d103284e76b5359ab27ceee Mon Sep 17 00:00:00 2001
From: Jono Wenger <jono@elixxir.io>
Date: Thu, 20 Oct 2022 14:44:45 -0700
Subject: [PATCH] Add Purge function to clear all storage used by wasm
---
main.go | 3 +++
wasm/purge.go | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 68 insertions(+)
diff --git a/main.go b/main.go
index 5da0d86b..46ad9d8c 100644
--- a/main.go
+++ b/main.go
@@ -141,6 +141,9 @@ func main() {
js.Global().Set("GetDefaultE2eFileTransferParams",
js.FuncOf(wasm.GetDefaultE2eFileTransferParams))
+ // wasm/purge.go
+ js.Global().Set("Purge", js.FuncOf(wasm.Purge))
+
// wasm/restlike.go
js.Global().Set("RestlikeRequest", js.FuncOf(wasm.RestlikeRequest))
js.Global().Set("RestlikeRequestAuth", js.FuncOf(wasm.RestlikeRequestAuth))
diff --git a/wasm/purge.go b/wasm/purge.go
index 25c3664c..24bbef13 100644
--- a/wasm/purge.go
+++ b/wasm/purge.go
@@ -7,9 +7,74 @@
package wasm
+import (
+ "github.com/hack-pad/go-indexeddb/idb"
+ "github.com/pkg/errors"
+ "gitlab.com/elixxir/xxdk-wasm/creds"
+ "gitlab.com/elixxir/xxdk-wasm/utils"
+ "sync/atomic"
+ "syscall/js"
+)
+
// NumClientsRunning is an atomic that tracks the current number of Cmix
// followers that have been started. Every time one is started, this counter
// must be incremented and every time one is stopped, it must be decremented.
//
// This variable is an atomic. Only access it with atomic functions
var NumClientsRunning uint64
+
+// Purge clears all local storage and indexedDb databases saved by this WASM
+// binary. All Cmix followers must be closed and the user's password is
+// required.
+//
+// Warning: This deletes all storage local to the webpage running this WASM.
+// Only use if you want to destroy everything.
+//
+// Parameters:
+// - args[0] - Storage directory path (string).
+// - args[1] - Password used for storage (Uint8Array).
+//
+// Returns:
+// - Throws a TypeError if the password is incorrect or if not all Cmix
+// followers have been stopped.
+func Purge(_ js.Value, args []js.Value) interface{} {
+ // Check the password
+ if !creds.VerifyPassword(js.Value{}, []js.Value{args[1]}).(bool) {
+ utils.Throw(utils.TypeError, errors.New("invalid password"))
+ return nil
+ }
+
+ // Verify all Cmix followers are stopped
+ if n := atomic.LoadUint64(&NumClientsRunning); n != 0 {
+ utils.Throw(
+ utils.TypeError, errors.Errorf("%d Cmix followers running", n))
+ return nil
+ }
+
+ // Get all indexedDb database names
+ databaseList, err := utils.GetIndexedDbList()
+ if err != nil {
+ utils.Throw(
+ utils.TypeError, errors.Errorf(
+ "failed to get list of indexedDb database names: %+v", err))
+ return nil
+ }
+
+ // Delete each database
+ for _, dbName := range databaseList {
+ _, err = idb.Global().DeleteDatabase(dbName)
+ if err != nil {
+ utils.Throw(
+ utils.TypeError, errors.Errorf(
+ "failed to delete indexedDb database %q: %+v", dbName, err))
+ return nil
+ }
+ }
+
+ // Clear WASM local storage and EKV
+ ls := utils.GetLocalStorage()
+ ls.ClearWASM()
+ ls.ClearPrefix(args[0].String())
+
+ return nil
+}
--
GitLab