(hopefully) working photos upload backend

src/entity/Photo.ts

@@ -1,10 +1,29 @@
+import * as path from "path";
+import * as fs from "fs/promises";
+import * as mime from "mime-types";
+import { constants as fsConstants } from "fs";
+
 import {
+    AfterRemove,
     BaseEntity,
+    BeforeRemove,
     Column,
     Entity,
     Index,
+    ManyToOne,
     PrimaryGeneratedColumn,
 } from "typeorm";
+import { User } from "./User";
+
+export interface IPhotoJSON {
+    id: number;
+    user: number;
+    hash: string;
+    size: string;
+    format: string;
+    createdAt: number;
+    editedAt: number;
+}
 
 @Entity()
 export class Photo extends BaseEntity {
@@ -14,4 +33,73 @@ export class Photo extends BaseEntity {
     @Column({ length: 190 })
     @Index()
     public hash: string;
+
+    @Column({ length: 190 })
+    @Index()
+    public size: string;
+
+    @Column({ length: 190 })
+    @Index()
+    public format: string;
+
+    @Column({ type: "timestamp", default: null })
+    public createdAt: Date;
+
+    @Column({ type: "timestamp", default: null })
+    public editedAt: Date;
+
+    @ManyToOne(() => User, (user) => user.photos, { eager: true })
+    public user: User;
+
+    public getFileName(): string {
+        return `${this.user.id.toString()}-${this.hash}-${this.size}.${
+            mime.extension(this.format) as string
+        }`;
+    }
+
+    public getPath(): string {
+        return path.join(this.user.getDataPath(), this.getFileName());
+    }
+
+    @BeforeRemove()
+    async cleanupFiles(): Promise<void> {
+        try {
+            await fs.unlink(this.getPath());
+        } catch (e) {
+            if (e.code !== "ENOENT") {
+                throw e;
+            }
+        }
+    }
+
+    public async isUploaded(): Promise<boolean> {
+        try {
+            await fs.access(this.getPath(), fsConstants.F_OK);
+            return true;
+        } catch (e) {
+            return false;
+        }
+    }
+
+    constructor(user: User, hash: string, size: string, format: string) {
+        super();
+        this.createdAt = new Date();
+        this.editedAt = this.createdAt;
+        this.hash = hash;
+        this.format = format;
+        this.size = size;
+        this.user = user;
+    }
+
+    public toJSON(): IPhotoJSON {
+        return {
+            id: this.id,
+            user: this.user.id,
+            hash: this.hash,
+            size: this.size,
+            format: this.format,
+            createdAt: this.createdAt.getTime(),
+            editedAt: this.editedAt.getTime(),
+        };
+    }
 }