feat: better permissions management

packages/core/src/structures/special/permissions.ts

@@ -1,5 +1,13 @@
 import { BitwisePermissionFlags } from '@biscuitland/api-types';
 
+export interface BitField<T extends number | bigint> {
+    add(...bits: T[]): this;
+    remove(...bits: T[]): this;
+    has(bit: T): boolean;
+    any(bit: T): boolean;
+    equals(bit: T): boolean;
+}
+
 export type PermissionString = keyof typeof BitwisePermissionFlags;
 export type PermissionResolvable =
 	| bigint
@@ -7,22 +15,84 @@ export type PermissionResolvable =
 	| PermissionString[]
 	| BitwisePermissionFlags;
 
-export class Permissions {
+export class Permissions implements BitField<bigint> {
+    /** Stores a reference to BitwisePermissionFlags */
 	static Flags = BitwisePermissionFlags;
+
+    /** Falsy; Stores the lack of permissions*/
+    static None = 0n;
+
+    /** Stores all entity permissions */
 	bitfield: bigint;
 
+    /** Wheter to grant all other permissions to the administrator */
+    __admin__: boolean = true;
+
 	constructor(bitfield: PermissionResolvable) {
 		this.bitfield = Permissions.resolve(bitfield);
 	}
 
+    get array(): PermissionString[] {
+        // unsafe cast, do not edit
+        const permissions = Object.keys(Permissions.Flags) as PermissionString[];
+        return permissions.filter(bit => typeof bit === 'number' && this.has(bit));
+    }
+
+    add(...bits: PermissionResolvable[]): this {
+        let reduced: bigint = 0n;
+        for (const bit of bits) {
+            reduced |= Permissions.resolve(bit);
+        }
+        this.bitfield |= reduced;
+        return this;
+    }
+
+    remove(...bits: PermissionResolvable[]): this {
+        let reduced: bigint = 0n;
+        for (const bit of bits) {
+            reduced |= Permissions.resolve(bit);
+        }
+        this.bitfield &= ~reduced;
+        return this;
+    }
+
 	has(bit: PermissionResolvable): boolean {
-		if (this.bitfield & BigInt(Permissions.Flags.ADMINISTRATOR)) {
+        const bbit = Permissions.resolve(bit);
+
+		if (this.__admin__ && this.bitfield & BigInt(Permissions.Flags.ADMINISTRATOR)) {
 			return true;
 		}
 
-		return !!(this.bitfield & Permissions.resolve(bit));
+		return (this.bitfield & bbit) === bbit;
 	}
 
+    any(bit: PermissionResolvable): boolean {
+        const bbit = Permissions.resolve(bit);
+
+        if (this.__admin__ && this.bitfield & BigInt(Permissions.Flags.ADMINISTRATOR)) {
+            return true;
+        }
+
+        return (this.bitfield & bbit) === 0n;
+    }
+
+    equals(bit: PermissionResolvable): boolean {
+        return !!(this.bitfield & Permissions.resolve(bit));
+    }
+
+    /** Gets all permissions */
+    static get All(): bigint {
+        let reduced = 0n;
+        for (const key in BitwisePermissionFlags) {
+            const perm = BitwisePermissionFlags[key];
+
+            if (typeof perm === 'number') {
+                reduced += perm;
+            }
+        }
+        return reduced;
+    }
+
 	static resolve(bit: PermissionResolvable): bigint {
 		switch (typeof bit) {
 			case 'bigint':
@@ -42,8 +112,16 @@ export class Permissions {
 		}
 	}
 
+    *[Symbol.iterator]() {
+        yield* this.array;
+    }
+
+    valueOf() {
+        return this.bitfield;
+    }
+
     toJSON(): { fields: string[] } {
-        const fields = Object.keys(Permissions.Flags).filter((bit) => typeof bit !== 'string' && this.has(bit));
+        const fields = Object.keys(Permissions.Flags).filter((bit) => typeof bit === 'number' && this.has(bit));
 
         return { fields };
     }