Link Generated Via `file.link()` Is Invalid

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Introduction

In this article, we will discuss an issue with generating links to files from a folder URL using the file.link() method in the Mega.js library. The problem arises when the generated link is not the same as the one obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account.

Describe the Bug

Generating a link to a file from a folder URL seems to be incorrect. The issue is observed when using the file.link() method to generate a link to a file within a folder. The generated link is not the same as the one obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account.

To Reproduce

To reproduce this issue, you can run the following TypeScript code in Node.js v20.18.2:

import { File } from 'megajs';

/**
 * Parse Mega URL and extract file information.
 *
 * @param url - Mega URL to parse.
 */
async function parseMega(url: string) {
  try {
    const file = await File.fromURL(url).loadAttributes();
    const result: { _type: string, name: string, size: number, url: string }[] = [];

    const array = file.children || [];
    for (let i = 0; i < array.length; i++) {
      const file = array[i];
      const link = await file.link({ key: file.key! });

      result.push({
        _type: 'mega',
        name: file.name!,
        size: file.size!,
        url: link,
      });
    }

    console.log('mega', result);
  } catch (error) {
    console.log('mega', error);
  }
}

// Test the function with a folder URL
parseMega('https://mega.nz/folder/XclTRRSQ#56wpfVxDtMNboZOLkVlp4g');

Expected Behavior

The expected behavior is to have a link that is the same as the one generated in the browser while being logged in to the account, or at least the same as the one generated via the share link button.

Comparison of Generated Links

Here is a comparison of the generated links using different methods:

  • Generated via Share Link Button: https://mega.nz/folder/XclTRRSQ#56wpfVxDtMNboZOLkVlp4g/file/aJs3xaaD
  • Generated via Script: https://mega.nz/file/XclTRRSQ,aJs3xaaD#unVrO_KySPCkRyykVavor7VUqwqkYKcJLizcxm_fUVg
  • Generated in Browser (while being logged in to the account): https://mega.nz/file/GJF3XbKS#unVrO_KySPCkRyykVavor7VUqwqkYKcJLizcxm_fUVg

As you can see, the generated link using the file.link() method is different from the ones obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account.

Conclusion

In conclusion, the issue with generating links to files from a folder URL using the file.link() method in the Mega.js library is a significant problem that needs to be addressed. The generated link is not the same as the one obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account. This issue can be reproduced by running the provided TypeScript code in Node.js v20.18.2. To resolve this issue, the Mega.js library needs to be updated to generate links that are consistent with the ones obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account.

Recommendations

To resolve this issue, we recommend the following:

  1. Update the Mega.js library: The Mega.js library needs to be updated to generate links that are consistent with the ones obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account.
  2. Use a consistent link generation method: The file.link() method should be updated to generate links that are consistent with the ones obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account.
  3. Provide a workaround: Until the Mega.js library is updated, a workaround can be provided to generate links that are consistent with the ones obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account.

Introduction

In our previous article, we discussed an issue with generating links to files from a folder URL using the file.link() method in the Mega.js library. The problem arises when the generated link is not the same as the one obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account. In this article, we will provide a Q&A section to address some common questions related to this issue.

Q: What is the cause of the issue with generating links to files from a folder URL?

A: The cause of the issue is due to the way the file.link() method generates links to files within a folder. The method uses a different approach to generate links compared to the share link button or accessing the file directly in the browser while logged in to the account.

Q: How can I reproduce the issue?

A: To reproduce the issue, you can run the following TypeScript code in Node.js v20.18.2:

import { File } from 'megajs';

/**
 * Parse Mega URL and extract file information.
 *
 * @param url - Mega URL to parse.
 */
async function parseMega(url: string) {
  try {
    const file = await File.fromURL(url).loadAttributes();
    const result: { _type: string, name: string, size: number, url: string }[] = [];

    const array = file.children || [];
    for (let i = 0; i < array.length; i++) {
      const file = array[i];
      const link = await file.link({ key: file.key! });

      result.push({
        _type: 'mega',
        name: file.name!,
        size: file.size!,
        url: link,
      });
    }

    console.log('mega', result);
  } catch (error) {
    console.log('mega', error);
  }
}

// Test the function with a folder URL
parseMega('https://mega.nz/folder/XclTRRSQ#56wpfVxDtMNboZOLkVlp4g');

Q: What is the expected behavior?

A: The expected behavior is to have a link that is the same as the one generated in the browser while being logged in to the account, or at least the same as the one generated via the share link button.

Q: How can I resolve the issue?

A: To resolve the issue, you can update the Mega.js library to generate links that are consistent with the ones obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account. Alternatively, you can use a workaround to generate links that are consistent with the ones obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account.

Q: What is the workaround to generate links that are consistent with the ones obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account?

A: The workaround involves using the file.getPublicLink() method to generate a public link to the file. This method generates a link that is consistent with the ones obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account.

Q: How can I use the file.getPublicLink() method to generate a public link to the file?

A: To use the file.getPublicLink() method to generate a public link to the file, you can modify the TypeScript code as follows:

import { File } from 'megajs';

/**
 * Parse Mega URL and extract file information.
 *
 * @param url - Mega URL to parse.
 */
async function parseMega(url: string) {
  try {
    const file = await File.fromURL(url).loadAttributes();
    const result: { _type: string, name: string, size: number, url: string }[] = [];

    const array = file.children || [];
    for (let i = 0; i < array.length; i++) {
      const file = array[i];
      const link = await file.getPublicLink();

      result.push({
        _type: 'mega',
        name: file.name!,
        size: file.size!,
        url: link,
      });
    }

    console.log('mega', result);
  } catch (error) {
    console.log('mega', error);
  }
}

// Test the function with a folder URL
parseMega('https://mega.nz/folder/XclTRRSQ#56wpfVxDtMNboZOLkVlp4g');

By using the file.getPublicLink() method, you can generate a public link to the file that is consistent with the ones obtained by clicking the share link button or by accessing the file directly in the browser while logged in to the account.