Azure Function that Access Blob Storage

Adapted from sample project here

The com.functions.AddFileExtensionToBlobFunction azure function does the following:

Takes a file path in the blob container
Uses Apache Tika to detect what the file type is
Renames the file on the blobstorage container to the proper file extension

Here is an example of how to call the function: http://localhost:7071/api/addFileExtension?file=testnoext/noextjpg

Setup

Update the configurations in local.settings.json
- Replace the storageaccountname with the name of your storage account and replace *** in AccountKey=*** with your Account Key from Azure
Update the functionResourceGroup and functionResourceGroup configurations in pom.xml
Run maven to build per the instructions here

Since azure functions aren't allowed long running times you would need to run this for each individual file.

To update all the files on an Azure Blob Storage account you would need to get a list of all the file names:

Here's an example script:

#!/bin/bash

STORAGE_ACCOUNT=storageaccount
STORAGE_ACCOUNT_KEY=key
STORAGE_CONTAINER=container
AZ_FUNCTION_HOST=http://localhost:7071

# Output list of extensionless files to extensionless-files.txt
az storage blob list --account-name STORAGE_ACCOUNT --account-key STORAGE_ACCOUNT_KEY --container-name STORAGE_CONTAINER --query '[].name' --output tsv | grep -E '^[^.]+$' > extensionless-files.txt

# Run request on each extension-less path
cat extensionless-files.txt | xargs -I {} curl "$AZ_FUNCTION_HOST/api/addFileExtension?file={}"

andrewmkhoury/azure-function-blob-storage

Azure Function that Access Blob Storage

Setup