Added Permission creation

ref #11

src/models/actions/CreatePermission.ts

@@ -0,0 +1,54 @@
+import {
+    IsInt,
+    IsNotEmpty
+} from "class-validator";
+import { getConnectionManager } from 'typeorm';
+import { PrincipalNotFoundError } from '../../errors/PrincipalsErrors';
+import { Permission } from '../entities/Permission';
+import { Principal } from '../entities/Principal';
+import { PermissionAction } from '../enums/PermissionAction';
+import { PermissionTarget } from '../enums/PermissionTargets';
+
+/**
+ * Defines a track of given length.
+*/
+export class CreatePermission {
+
+    /**
+     * The permissions's principal's id.
+     */
+    @IsInt()
+    @IsNotEmpty()
+    principal: number;
+
+    /**
+     * The permissions's target.
+     */
+    @IsNotEmpty()
+    target: PermissionTarget;
+
+    /**
+     * The permissions's action.
+     */
+    @IsNotEmpty()
+    action: PermissionAction;
+
+    /**
+     * Converts a Permission object based on this.
+     */
+    public async toPermission(): Promise<Permission> {
+        let newPermission: Permission = new Permission();
+
+        newPermission.principal = await this.getPrincipal();
+        newPermission.target = this.target;
+        newPermission.action = this.action;
+
+        return newPermission;
+    }
+
+    public async getPrincipal(): Promise<Principal> {
+        let principal = await getConnectionManager().get().getRepository(Principal).findOne({ id: this.principal })
+        if (!principal) { throw new PrincipalNotFoundError(); }
+        return principal;
+    }
+}