What should I do if uniAPP does not support OSS?

With the continuous development of Internet technology, more and more people are beginning to migrate their businesses to the Internet. The emergence of cloud storage systems has facilitated the development and operation of various businesses. In this context, uniAPP, as an important cross-platform application development framework, has become the choice of many developers. However, some developers have encountered a problem, that is, uniAPP does not support oss.

oss, the full name of "Object Storage Service", is a cloud storage system launched by Alibaba Cloud. It can provide high availability, high performance, high scalability and low-cost data storage services, and is widely used in various scenarios. For uniAPP developers, using oss to store and manage files can improve the performance and availability of applications. However, uniAPP currently does not support oss, which is undoubtedly a limitation for developers.

So, why can’t uniAPP support oss? The answer to this question is actually very simple, that is, the oss API does not support cross-domain requests. The development model of uniAPP is to use HBuilderX for local development, and then package the code into a native application or H5 application. Since HBuilderX itself does not support CORS, it cannot implement cross-domain requests to oss.

So, is there any solution? In fact, uniAPP is not completely unable to support oss. As long as we take some special methods, we can achieve oss support. Here we introduce a solution based on server-side proxy.

First, we need to create a proxy program on the server side to forward client requests to oss. Specifically, we can use Node.js to implement this agent. Node.js is an open source JavaScript running environment that is widely used on the server side and can easily implement various network applications.

We can implement the oss solution based on the server proxy through the following steps:

1. Create a Node.js project and import the ali-oss dependency.
2. Write the code for the agent program. The code is as follows:

const http = require('http');
const url = require('url');
const OSS = require('ali-oss');

const client = new OSS({
  region: 'oss-region',
  accessKeyId: 'oss-access-key-id',
  accessKeySecret: 'oss-access-key-secret',
  bucket: 'oss-bucket-name'
});

http.createServer((req, res) => {
  const pathname = url.parse(req.url).pathname.slice(1);
  const stream = client.getStream(pathname);
  stream.on('error', () => {
    res.writeHead(404);
    res.end();
  });
  stream.pipe(res);
}).listen(8080);

3. Deploy the agent program to the server. You can choose to use a cloud server or your own local computer as the server, and use tools such as pm2 to keep the program running.
4. When initiating a request in uniAPP, modify the requested URL to the address of the agent program, as follows:

const imageUrl = 'http://example.com/image.jpg';
const proxyUrl = 'http://server-ip:8080/' + imageUrl.slice(imageUrl.indexOf('/', 8) + 1);

5. Send the modified URL to the server, and the server The request will be forwarded to oss and the result will be returned to the client.

There are some security issues that need to be noted when using this solution. Because agents have certain permissions, they may be exploited by hackers if not properly protected. Therefore, when deploying an agent program, access rights should be restricted and security protection measures should be configured to ensure the security and stability of the program.

To sum up, although uniAPP currently cannot directly support oss, we can achieve oss support by using a server-side proxy-based solution. Through this method, we can implement richer functions in uniAPP and improve application performance and user experience.

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