How to Unzip Password Protected Files in Azure Blob Storage using Python Azure Functions

Discover the step-by-step guide on how to efficiently unzip password-protected files stored in Azure Blob Storage using Azure Functions written in Python.
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This video is based on the question https://stackoverflow.com/q/65612148/ asked by the user 'Rameshwar Pawale' ( https://stackoverflow.com/u/1794528/ ) and on the answer https://stackoverflow.com/a/65624374/ provided by the user 'Jim Xu' ( https://stackoverflow.com/u/10505040/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Unzipping Password Protected Files in Azure Blob Storage using Azure Functions

Storing files in the cloud has become increasingly popular, and Azure Blob Storage is a fantastic service for managing your files. But what if you have a password-protected ZIP file that you need to unzip directly from your Azure Blob Storage? This is a common challenge many developers face when working with Azure Functions. In this guide, we will address the issue of unzipping a password-protected file stored in Azure Blob Storage using Python and Azure Functions.

The Problem: Accessing and Unzipping Files

Recently, a user encountered an issue while trying to unzip a password-protected file stored in an Azure Blob container. They created an Azure Function App with a Timer Control event based on Python, but faced an error stating that the file could not be found. The underlying issue arises from the way Azure Blob storage serves files: the zip files are stored remotely on the server, and attempting to directly access them using the ZipFile method leads to file-not-found errors.

Error Encountered

Error Message: FileNotFoundError: [Errno 2] No such file or directory: 'TestZip.zip'

The Solution: Step-by-Step Guide to Unzipping

To successfully unzip a password-protected file in Azure Blob Storage, we need to follow a few important steps. Below is a detailed approach on how to achieve this.

Step 1: Retrieve the Blob Service Client

First, you will need to connect to your Azure Blob Service. This involves using your connection string to create a BlobServiceClient object. This client allows you to interact with your Blob Storage account.

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Step 2: Define Container Clients

Next, define your source and destination containers. In this case, we will use input for the container that contains your zip file, and output for where the unzipped files will be stored.

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Step 3: Download and Unzip the File

This is where we read the zip file contents and extract them. We’ll use io.BytesIO to manage the in-memory binary stream, and the zipfile module to handle the unzipping process.

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Step 4: Execute the Process with an Azure Function

Once you encapsulate this logic in an Azure Function, you will be able to run this process every time the function is triggered based on your defined schedule. Make sure that your environment variables and Azure storage setup are correct for seamless processing.

Conclusion

By following the steps outlined in this guide, you should now be able to unzip password-protected files stored in Azure Blob Storage with ease using Python and Azure Functions. Remember that by handling files directly in memory and managing your containers appropriately, you can efficiently work with files stored in the cloud without running into "file not found" errors.

By automating the process within Azure Functions, you can save time and resources while ensuring data is correctly processed and stored.

If you have any further questions or issues while implementing this, feel free to reach out or leave a comment below!

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