Azure Blob download file

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Posted on by bettc

Hi All,

Im wondering if anyone knows how to download azure blob files in Power Apps?

I can upload perfectly well, i can use a shared access signature to download. The problem with that is that SAS URLs are anonymous and can be accessed by anyone in the world. We need to make sure the blob files can only be downloaded by people in our tenant.

I cant figure out how to download files in Power Apps not using a SAS URL

has anyone managed to get this to work? im basically going to have to switch over to SharePoint Online which seems like a massive step back.

- the Download and Launch functions dont allow a file binary to be passed to them.

- if i send the user to the standand URL of blob file, it says the file is not there (no SAS key in the URL)

- am i meant to use a Custom Connector and configure that to get a token and get the file? how would i download that anyway?

it seems like Power Apps cant acess blob files securely?

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Building Power Apps

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v-bofeng-msft on at

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Hi @bettc :
Firstly,only users in the same tenant can access your app, so you don’t have to worry about users who are not in the same tenant.(Even guest users need you to invite them to tenants and share the app with them before they can access the app)
Share canvas apps with guests in your organization
Secondly, if you are worried that users in the tenant can obtain the URL of the file by editing the App and then spread it to the outside world, then you can restrict user access or edit app permissions by assigning security roles.
Manage security for your environments
Best Regards,
Bof

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bettc 44 on at

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the URL to the file is still anonymous. its not the security within the power app. its the URL's lack of security for the blob file as it contains the SAS key.

ended up getting a PCF control that allows Power Apps to send a file to the browser without a URL for downloading.

Both the Launch and Download functions in Power Apps need a URL. Even though in my Power App i have the base64 string content, filename and mimetype there is no way to send that to the browser so the user can download it.

the PCF control allows that. no more anon SAS key, just the file.

https://github.com/rwilson504/PCFControls

it would be good if the Download function was extendend to take the base64 string and filename as well as a URL

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rohitsbots 280 on at

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@bettc which pcf control did you use ?

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Power Platform 1919 1,890 on at

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Hi @bettc, the workaround what i use generally is (Power Automate Way):
1. Prepare your inputs to pass to flow as Input parameters
2. Get the file content for selected azure blob (binary content)
3. Then use OneDrive connector to create a file with the fetched content
4. Then generate a share link for the newly created file
5. Send the generated link back to power apps (use download /launch function Along with ?download=1 to force download)
6. add a delay of 30 seconds or upto 5 min and delete the file.

I always use this workaround if I have to download anything to power apps.

Please give the mentioned solution a try and let me know whether it works for you.
If it solves your issue, feel free to mark this thread as answered.
Please make sure to like the response!
Thanks!
- Hemanth Sai

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