3 files changed, 485 insertions, 0 deletions
diff --git a/src/api/DataStore/LICENSE b/src/api/DataStore/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/src/api/DataStore/LICENSE
@@ -0,0 +1,202 @@
+
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diff --git a/src/api/DataStore/index.ts b/src/api/DataStore/index.ts
new file mode 100644
index 0000000..f0764b3
--- /dev/null
+++ b/src/api/DataStore/index.ts
@@ -0,0 +1,282 @@
+// This is https://github.com/jakearchibald/idb-keyval v6.2.0
+// The only change is changing the default DB & Store name
+// and formatting it to pass our configs
+// I would usually not add my own Copyright for such a small modification
+// but the Apache License requires this.
+
+/*
+ * Copyright 2016, Jake Archibald
+ * Copyright 2022, Vendicated
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export function promisifyRequest<T = undefined>(
+    request: IDBRequest<T> | IDBTransaction,
+): Promise<T> {
+    return new Promise<T>((resolve, reject) => {
+        // @ts-ignore - file size hacks
+        request.oncomplete = request.onsuccess = () => resolve(request.result);
+        // @ts-ignore - file size hacks
+        request.onabort = request.onerror = () => reject(request.error);
+    });
+}
+
+export function createStore(dbName: string, storeName: string): UseStore {
+    const request = indexedDB.open(dbName);
+    request.onupgradeneeded = () => request.result.createObjectStore(storeName);
+    const dbp = promisifyRequest(request);
+
+    return (txMode, callback) =>
+        dbp.then(db =>
+            callback(db.transaction(storeName, txMode).objectStore(storeName)),
+        );
+}
+
+export type UseStore = <T>(
+    txMode: IDBTransactionMode,
+    callback: (store: IDBObjectStore) => T | PromiseLike<T>,
+) => Promise<T>;
+
+let defaultGetStoreFunc: UseStore | undefined;
+
+function defaultGetStore() {
+    if (!defaultGetStoreFunc) {
+        defaultGetStoreFunc = createStore("VencordData", "VencordStore");
+    }
+    return defaultGetStoreFunc;
+}
+
+/**
+ * Get a value by its key.
+ *
+ * @param key
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function get<T = any>(
+    key: IDBValidKey,
+    customStore = defaultGetStore(),
+): Promise<T | undefined> {
+    return customStore("readonly", store => promisifyRequest(store.get(key)));
+}
+
+/**
+ * Set a value with a key.
+ *
+ * @param key
+ * @param value
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function set(
+    key: IDBValidKey,
+    value: any,
+    customStore = defaultGetStore(),
+): Promise<void> {
+    return customStore("readwrite", store => {
+        store.put(value, key);
+        return promisifyRequest(store.transaction);
+    });
+}
+
+/**
+ * Set multiple values at once. This is faster than calling set() multiple times.
+ * It's also atomic – if one of the pairs can't be added, none will be added.
+ *
+ * @param entries Array of entries, where each entry is an array of `[key, value]`.
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function setMany(
+    entries: [IDBValidKey, any][],
+    customStore = defaultGetStore(),
+): Promise<void> {
+    return customStore("readwrite", store => {
+        entries.forEach(entry => store.put(entry[1], entry[0]));
+        return promisifyRequest(store.transaction);
+    });
+}
+
+/**
+ * Get multiple values by their keys
+ *
+ * @param keys
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function getMany<T = any>(
+    keys: IDBValidKey[],
+    customStore = defaultGetStore(),
+): Promise<T[]> {
+    return customStore("readonly", store =>
+        Promise.all(keys.map(key => promisifyRequest(store.get(key)))),
+    );
+}
+
+/**
+ * Update a value. This lets you see the old value and update it as an atomic operation.
+ *
+ * @param key
+ * @param updater A callback that takes the old value and returns a new value.
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function update<T = any>(
+    key: IDBValidKey,
+    updater: (oldValue: T | undefined) => T,
+    customStore = defaultGetStore(),
+): Promise<void> {
+    return customStore(
+        "readwrite",
+        store =>
+            // Need to create the promise manually.
+            // If I try to chain promises, the transaction closes in browsers
+            // that use a promise polyfill (IE10/11).
+            new Promise((resolve, reject) => {
+                store.get(key).onsuccess = function () {
+                    try {
+                        store.put(updater(this.result), key);
+                        resolve(promisifyRequest(store.transaction));
+                    } catch (err) {
+                        reject(err);
+                    }
+                };
+            }),
+    );
+}
+
+/**
+ * Delete a particular key from the store.
+ *
+ * @param key
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function del(
+    key: IDBValidKey,
+    customStore = defaultGetStore(),
+): Promise<void> {
+    return customStore("readwrite", store => {
+        store.delete(key);
+        return promisifyRequest(store.transaction);
+    });
+}
+
+/**
+ * Delete multiple keys at once.
+ *
+ * @param keys List of keys to delete.
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function delMany(
+    keys: IDBValidKey[],
+    customStore = defaultGetStore(),
+): Promise<void> {
+    return customStore("readwrite", (store: IDBObjectStore) => {
+        keys.forEach((key: IDBValidKey) => store.delete(key));
+        return promisifyRequest(store.transaction);
+    });
+}
+
+/**
+ * Clear all values in the store.
+ *
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function clear(customStore = defaultGetStore()): Promise<void> {
+    return customStore("readwrite", store => {
+        store.clear();
+        return promisifyRequest(store.transaction);
+    });
+}
+
+function eachCursor(
+    store: IDBObjectStore,
+    callback: (cursor: IDBCursorWithValue) => void,
+): Promise<void> {
+    store.openCursor().onsuccess = function () {
+        if (!this.result) return;
+        callback(this.result);
+        this.result.continue();
+    };
+    return promisifyRequest(store.transaction);
+}
+
+/**
+ * Get all keys in the store.
+ *
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function keys<KeyType extends IDBValidKey>(
+    customStore = defaultGetStore(),
+): Promise<KeyType[]> {
+    return customStore("readonly", store => {
+        // Fast path for modern browsers
+        if (store.getAllKeys) {
+            return promisifyRequest(
+                store.getAllKeys() as unknown as IDBRequest<KeyType[]>,
+            );
+        }
+
+        const items: KeyType[] = [];
+
+        return eachCursor(store, cursor =>
+            items.push(cursor.key as KeyType),
+        ).then(() => items);
+    });
+}
+
+/**
+ * Get all values in the store.
+ *
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function values<T = any>(customStore = defaultGetStore()): Promise<T[]> {
+    return customStore("readonly", store => {
+        // Fast path for modern browsers
+        if (store.getAll) {
+            return promisifyRequest(store.getAll() as IDBRequest<T[]>);
+        }
+
+        const items: T[] = [];
+
+        return eachCursor(store, cursor => items.push(cursor.value as T)).then(
+            () => items,
+        );
+    });
+}
+
+/**
+ * Get all entries in the store. Each entry is an array of `[key, value]`.
+ *
+ * @param customStore Method to get a custom store. Use with caution (see the docs).
+ */
+export function entries<KeyType extends IDBValidKey, ValueType = any>(
+    customStore = defaultGetStore(),
+): Promise<[KeyType, ValueType][]> {
+    return customStore("readonly", store => {
+        // Fast path for modern browsers
+        // (although, hopefully we'll get a simpler path some day)
+        if (store.getAll && store.getAllKeys) {
+            return Promise.all([
+                promisifyRequest(
+                    store.getAllKeys() as unknown as IDBRequest<KeyType[]>,
+                ),
+                promisifyRequest(store.getAll() as IDBRequest<ValueType[]>),
+            ]).then(([keys, values]) => keys.map((key, i) => [key, values[i]]));
+        }
+
+        const items: [KeyType, ValueType][] = [];
+
+        return customStore("readonly", store =>
+            eachCursor(store, cursor =>
+                items.push([cursor.key as KeyType, cursor.value]),
+            ).then(() => items),
+        );
+    });
+}
diff --git a/src/api/index.ts b/src/api/index.ts
index 7c379f9..036fed6 100644
--- a/src/api/index.ts
+++ b/src/api/index.ts
@@ -1,3 +1,4 @@
 export * as MessageEvents from "./MessageEvents";
 export * as Notices from "./Notices";
 export * as Commands from "./Commands";
+export * as DataStore from "./DataStore";