What is the best approach for the following requirement: I have files stored in Azure Blob Storage with a Private endpoint. I need to show to the user, a table with a column containing these file URLs in the browser. When a user clicks on the link, it should either open the file in a new tab or download the file.
I could show the URLs and download files using the Power BI report when the Blob Storage has public access. But in my scenario, it's a Private endpoint. I tried appending the SAS token to the URL, and that also worked, but in this case, SAS token is visible in the browser which is not allowed in my case. So this also does not work for my scenario.
Can we achieve this using Power BI or Power Apps or any other tools/api?
Could you please suggest the steps?
Thanks
I tried in my environment and got below results:
If you need download blob through browser with private container, you need Blob URL + SAS token because it provides read and writes to access blobs.
If you are using public container, you can download with Blob URL through browser.
There is no option to call your Blob URL by hiding SAS token.
As workaround, if you need to hide the SAS token from the user and try to access the blob, you can make use of Power Automate connector here:
I have connected to my Azure blob storage with these Power Automate connectors. 1) I have first connected to my Blob URL endpoint> And created a SAS URI with this connector.
The SAS URI is created successfully by the connector, and I have saved the SAS token inside the compose variable for it to be hidden.
Later I call an HTTP trigger to trigger the SAS token and get the Image content as HTTP body in the output.
When I decode the HTTP body content> I get my Blob Image successfully.
You can convert base64 to image you can use this link:
If you want your users to access this Blob, you can further convert this b64 encoded string into Image and save the file in OneDrive, SharePoint for your users to access you can refer this link by eric-cheng.
If you want to Email your users the Blob file, that can also be done by using Outlook, Gmail, etc connectors later.
Related
Is there a configuration in Azure Blob storage that lets you link to a single file (or one that lets you link to a specific 'folder' in the Azure portal interface), but redirects the viewer into a login screen if they're not already signed in?
I am not terribly familiar with Azure Blob storage yet, but I see an option for 'anonymous' access, which isn't what I want (I want them to need to be logged in and have the proper permissions for that container), and I see an option for SAS (which isn't what I want, because it grants anyone who has the link access, and is time-boxed)
https://learn.microsoft.com/en-us/answers/questions/435869/require-login-when-accessing-blob-storage-url.html
This link appears to be asking the same question, and the response says something about 'role-based authentication' - I get the concept of adding roles to users, and using those as the authorization, but even as the owner of the blob container I can't seem to just link to myservice.blob.core.windows.net/container/myfile.jpg and download it without appending a SAS key.
Nor a way to link to myservice.blob.core.windows.net/container/myfolder and have it authenticate them then take them into that 'directory' in the UI.
If the access level of the container is set to public anonymous, we can directly access the Blob Uri in the browser to access the blobs.
If the access level of the container is set to private, opening the Blob Uri in the browser doesn’t redirect the user to the login screen. Instead, it will give ResourceNotFound error.
Even the proper role is assigned in the Role Assignments for the blob storage, still we would not be able to access the Blob Uri from the browser without appending the SAS token. Because, opening the direct Blob Uri in the browser doesn't trigger the OAuth flow.
Even though, it is not possible to access the blob Uri from browser and download the files, there are other ways to accomplish this.
We can use Azure CLI, PowerShell and Rest API to access the blob data with the authenticated users.
If you want to access the blob data from the browser, we can use function app. We can enable the function app for authentication. Then the authenticated users can access the blob data via function app.
Reference : azure - Access a blob file via URI over a web browser using new AAD based access control - Stack Overflow
Some of the user’s images are stored in Azure BLOB which is not publicly accessible. In our scenario we upload the images (user’s images) on private blob which later needs to be shown at the client side(Angular). Moreover the user should only be able to see the images that is related to him and not the images of other users.
We can generate the list of images URLs at server side but when this is passed to client side to render, it would fail naturally being blob not being public.
Now, being all the users who would access the application are internal to the organization, I believe authorization to access the images can be achieved by AAD/SAS. However at the same time, I am fail to understand how would I ensure or apply the security that if wanted user X should not be able to read the images of user Y?
Regarding the issue, you can use the following suggestions to implement it.
Store the User information and his image information (such as the image's azure blob container name, azure blob blob name ) in the database.
When the user wants to access the image, query the database with the user information to get these image,
After getting the image information, use the sdk to create sas token then return the image's blob url with sas token to cliend. Regarding how to create sas token, please refer to here.
I have a requirement to encrypt the images while uploading on Azure Blob storage so that even the authorized person with all the access would not be able to see the content. Furthermore, these encrypted images are required to be shown on Browser using Angular/React.
One solution which I can think of is to encrypt the blob & upload to Azure Blob and when images need to be displayed at browser side then decrypt & download the images locally at server side, create the URLs pointing to local folder at server and serve the content to the browser.
However this solution has a downside, in my case a user can have more than 100 images to be displayed and downloading the images first at server and then serve it locally instead of pointing the direct URL of Blob storage, would have performance impact.
Is there any better solution of doing the same. Thanks
I'm trying to label data using the Azure Form Recognizer labeling tool.
create Azure account and Form Recognizer resource
download docker image
run local web site
create a project, fill in a project name using plain English string.
I get the “SAS token to blob storage” by opening the "Get Shared Access Signature" on my Azure Storage Account, selecting all permissions, and then paste that string into the "Azure blog storage / SAS URI*" field in the tool.
provide my endpoint and key (endpoint url is copied from Azure Portal "quick start" page)
save.
result:
cannot create a new project due to “invalid character”.
"invalid character" can be caused by using the blob storage SAS token rather than the blob container SAS token. Try creating and using a SAS token to the blob container in the "Azure blob storage / SAS URI" field.
It seems I should have picked the SAS token to the blob container instead of the blob storage. These two terms are quite similar to each other, and they are next to each other in the Azure Storage Explorer UI. I re-created the project with the correct steps and it worked so far.
following are 2 screenshots from Azure Storage Explorer, hope this helps:
In my bot (using C# version of BotBuilder) I expect to receive attached files from users.
I am accepting them by processing message.Attachments object.
When running in Emulator for attached file I will get ContentURL like this:
http://localhost:9000/content/8a684db8?file=IMG-20160503-WA0002.jpg
from here I parse the URL to get to the filename and store it in local azure storage blob.
When I deploy my bot to azure and uploading files from Telegram (only chat app I connected so far) same file is posted with URL like this:
https://bcattachmentsprod.blob.core.windows.net/635994216000000000/3DOUR10S0J2IL4
from here I am loosing filename, trying to inspect other message.Attachments properties it does not seem to be there. Making WebRequst on this URL in a hope to have filename somewhere in the header also does not render results
Is this an intended behavior for posting URL when deployed to Azure and if yes, how can I get to the filename that user has attached?
I seem to like how ContentURL is formed when running under Emulator.
I'm not familiar with BotBuilder, but the blob name is always part of the URL that serves as the address for that blob.
The storage emulator uses well-known endpoints. For Blob storage, the URL will always have this address, where "mycontainer" is the name of your container and "myblob" is the name of your blob. So as you can see, the blob name is part of the URL path.
http://127.0.0.1:10000/devstoreaccount1/mycontainer/myblob
The emulator uses this URL format because it is addressing a resource on your local computer.
In your Azure storage account in the cloud, the URL will look like this, where "myaccount" is the name of your storage account, "mycontainer" is the name of your container, and "myblob" is the name of your blob:
https://myaccount.blob.core.windows.net/mycontainer/myblob
In your example above, "file=IMG-20160503-WA0002.jpg" is not part of a Blob storage URL. Perhaps this is appended by BotBuilder?
Please see these topics for more information:
https://msdn.microsoft.com/en-us/library/azure/dd135715.aspx
https://azure.microsoft.com/en-us/documentation/articles/storage-use-emulator/