Create an Example for "Get file contents" functionality

🆕🐥 First Timers Only

This issue is reserved for people who have never contributed to Hedera or any open source project in general. We know that creating a pull request (PR) is a major barrier for new contributors. The goal of this issue and all other issues labeled by 'good first issue' is to help you make your first contribution to Hedera.

👾 Description of the issue

Problem

The Hedera Java SDK includes a useful example, GetFileContentsExample.java, which demonstrates how to retrieve the contents of a file stored on the Hedera network. This example is crucial for developers who need to interact with Hedera’s File Service and fetch file data for further processing or validation.

However, there is no equivalent example available in the Hedera JavaScript SDK. Developers using the JavaScript SDK would benefit from an example that demonstrates how to query and retrieve file contents from Hedera, showcasing the ease of interacting with files stored on the network.

Solution

Below is a link to the existing Java implementation, which can serve as a basis for creating the JavaScript example: GetFileContentsExample.java

Steps to Implement

Client and operator setup: Set up the Hedera Client in the JavaScript SDK using setOperator.
File contents query:
- Use FileContentsQuery to query the contents of a specific file on the network.
- Specify the file ID for the file you want to retrieve.
- Set appropriate transaction fees to ensure the query is executed successfully.
Processing the file contents:
- Demonstrate how to output or further process the file contents (for example, printing the file data to the console).
Logging and output: Include appropriate console logs for each step of the process, from initiating the query to retrieving the file contents, so that users can follow along.
Error handling: Add error handling for common cases like non-existent files or access issues.

Expected Outcome

This new example will help developers using the JavaScript SDK understand how to retrieve file contents from the Hedera network. It will demonstrate how to leverage the File Service for real-world applications where file data needs to be queried and processed. Developers will also gain insight into handling file queries, managing fees, and interpreting query results.

By providing this JavaScript example, we align the JavaScript SDK with the Java SDK in terms of documentation and usability, making it easier for developers to build Hedera-based applications.

📋 Step by step guide to do a contribution

If you have never contributed to an open source project at GitHub, the following step-by-step guide will introduce you to the workflow. More information and concrete samples for shell commands for each step can be found in our CONTRIBUTING.md file. A more detailed general documentation of the GitHub PR workflow can be found here.

[ ] Claim this issue: Comment below that you are interested in working on the issue
[ ] Wait for assignment: A community member with the given rights will add you as an assignee of the issue
[ ] Fork the repository: You can do that in GitHub (by simply clicking the 'fork' button).
[ ] Check out the forked repository
[ ] Create a feature branch for the issue. We do not have a hard naming definition for branches but it is best practice to prefix the branch name with the issue id.
[ ] Solve the issue in your branch.
[ ] Commit your changes: Here, it is needed to add sign-off information to the commit to accept the "Developer Certificate of Origin" (https://developercertificate.org). More details can be found in our CONTRIBUTING.md
[ ] Start a Pull Request (PR): We have a pattern for naming pull requests that a GitHub Action checks. We use that pattern to support the creation of automatic release notes.
[ ] Check GitHub Actions: Several GitHub Actions will be triggered automatically for each PR. If a GitHub Action fails and you do not understand the cause of that error do not hesitate to add a comment to the PR and ask the Hedera developer community for support.
[ ] Wait for reviews: Members of the Hedera developer community will review your PR. If a reviewer finds any missing pieces or a problem, he or she will start a discussion with you and describe the next steps for solving the problem.
[ ] You did it 🎉: We will merge the fix in the develop branch. Thanks for being part of the Hedera community as an open-source contributor ❤️

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🤔 Additional Information

If you have any questions, just ask us directly in this issue by adding a comment. You can join our community chat at Discord. A general manual about open-source contributions can be found here.

hashgraph / hedera-sdk-js