From 2498e3e1d3778fdc784b9a7edaa5443050726b9b Mon Sep 17 00:00:00 2001
From: Greg Fodor <gfodor@gmail.com>
Date: Fri, 9 Mar 2018 18:32:07 -0800
Subject: [PATCH] Added store
---
src/storage/store.js | 77 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
create mode 100644 src/storage/store.js
diff --git a/src/storage/store.js b/src/storage/store.js
new file mode 100644
index 000000000..e4b814396
--- /dev/null
+++ b/src/storage/store.js
@@ -0,0 +1,77 @@
+import uuid from "uuid/v4";
+import { Validator } from "jsonschema";
+
+const LOCAL_STORE_KEY = "___mozilla_hubs";
+const STORE_STATE_CACHE_KEY = Symbol();
+const validator = new Validator();
+
+// Durable (via local-storage) schema-enforced state that is meant to be consumed via forward data flow.
+// (Think flux but with way less incidental complexity, at least for now :))
+const SCHEMA = {
+ id: "/MozillaHubsStore",
+
+ definitions: {
+ profile: {
+ type: "object",
+ additionalProperties: false,
+ properties: {
+ display_name: { type: "string", pattern: "^[A-Za-z0-9-]{3,32}$" },
+ }
+ }
+ },
+
+ type: "object",
+
+ properties: {
+ id: { type: "string", pattern: "^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$" },
+ profile: { "$ref": "#/definitions/profile" },
+ },
+
+ additionalProperties: false
+}
+
+export default class Store {
+ subscribers = new Set();
+
+ constructor() {
+ if (localStorage.getItem(LOCAL_STORE_KEY) === null) {
+ localStorage.setItem(LOCAL_STORE_KEY, JSON.stringify({ id: uuid() }));
+ }
+ }
+
+ get state() {
+ if (!this.hasOwnProperty(STORE_STATE_CACHE_KEY)) {
+ this[STORE_STATE_CACHE_KEY] = JSON.parse(localStorage.getItem(LOCAL_STORE_KEY));
+ }
+
+ return this[STORE_STATE_CACHE_KEY];
+ }
+
+ subscribe(subscriber) {
+ this.subscribers.add(subscriber);
+ }
+
+ update(newState) {
+ if (newState.id) {
+ console.error("Store id is immutable.");
+ return;
+ }
+
+ const finalState = { ...this.state, ...newState };
+ const isValid = validator.validate(finalState, SCHEMA).valid;
+
+ if (!isValid) {
+ console.warn(`Write of ${JSON.stringify(finalState)} to store failed schema validation.`)
+ return;
+ }
+
+ localStorage.setItem(LOCAL_STORE_KEY, JSON.stringify(finalState));
+ delete this[STORE_STATE_CACHE_KEY];
+
+ for (const subscriber of this.subscribers) {
+ subscriber();
+ }
+
+ return finalState;
+ }
+}
--
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