feat: File service logic

Author: eug-vs

services/files/files.class.ts

@@ -1,6 +1,10 @@
 import { Application } from '@feathersjs/express';
 import { Params } from '@feathersjs/feathers';
 import { v4 } from 'uuid';
+import axios from 'axios';
+import fs from 'fs';
+import path from 'path';
+import { User } from 'which-types';
 
 // Use require to avoid bug
 // https://stackoverflow.com/questions/62611373/heroku-crashes-when-importing-aws-sdk
@@ -13,15 +17,68 @@ export default class Files {
   bucket!: string;
 
   async find(params: Params): Promise<string> {
+    const path = this.generateS3Path(params.user?.username);
+    return this.getUploadUrl(path);
+  }
+
+  public isS3url(url: string): boolean {
+    return url.startsWith('https://${this.bucket}.s3');
+  }
+
+  public generateS3Path(prefix='', ext='png'): string {
+    const key = v4();
+    const fileName = `${key}.${ext}`;
+    return prefix ? `${prefix}/${fileName}` : fileName;
+  }
+
+  async getUploadUrl(path: string): Promise<string> {
     // Return signed upload URL
     return this.s3.getSignedUrl('putObject', {
       Bucket: this.bucket,
-      Key: `${params.user?.username}/${v4()}.png`,
+      Key: path,
       ContentType: 'image/*',
       Expires: 300,
     });
   }
 
+  async getDownloadUrl(path: string): Promise<string> {
+    return this.getUploadUrl(path).then((url: string) => {
+      const queryIndex = url.indexOf('?');
+      return url.slice(0, queryIndex);
+    })
+  }
+
+  private createTmpDir() {
+    if (!fs.existsSync('tmp')) fs.mkdirSync('tmp');
+  }
+
+  async downloadFile(url: string): Promise<string> {
+    return new Promise(async (resolve, reject) => {
+      this.createTmpDir();
+      const filePath = `tmp/${v4()}`;
+      const fileStream = fs.createWriteStream(filePath);
+      const response = await axios.get(url, { responseType: 'stream' })
+      response.data.pipe(fileStream)
+        .on('error', reject)
+        .on('close', () => resolve(filePath));
+    });
+  }
+
+  async uploadFileToS3(filePath: string, s3Path: string) {
+    const fileStream = fs.createReadStream(filePath);
+    const request = this.s3.upload({
+      Bucket: this.bucket,
+      Key: s3Path,
+      Body: fileStream,
+      ContentType: 'image/png'
+    });
+    request.on('httpUploadProgress', progress => {
+      console.log('progress', progress);
+    })
+    await request.promise();
+    return this.getDownloadUrl(s3Path);
+  }
+
   setup(app: Application): void {
     this.app = app;
     this.s3 = new S3({