Azure Logic App - How to upload file to Azure Blob Storage from byte array

Question

I am trying to create a Logic App that is triggered by an HttpRequest that contains as payload a JSON request. Inside of this JSON, one field contains the file:

{
"EntityId": "45643",
"SharedGuid": "00000000-0000-0000-0000-000000000000",
"Document": {
    "DocumentName": "MyFileName.pdf",
    "File": "JVBERi0xLjMKJfv8/f4KMS.....lJUVPRg=="
}}

This "file" content is being generated by the customer application by using the following C# function: File.ReadAllBytes("local path here").

I managed to upload the byte array to blob storage. But the file is not valid once it is uploaded in the Blob Storage.

I tried different file contents for the file in the JSON schema definition as: string, binary, application/octet-stream.

Any help will be appreciated.

Hury Shen · Accepted Answer · 2020-02-12 02:58:33Z

1

Did you do the operation to convert the byte to Base64String in your httprequest code, just like the code below:

byte[] b = File.ReadAllBytes(@"filepath");
string s = Convert.ToBase64String(b);

According to the file content you provided, it seems you have convert it to base64string as above, so I provide the solution below:

For this requirement, you can just parse the response data as string(do not need to use "binary" in schema) in your "Parse JSON" action and then use base64ToBinary() method in the "Create blob" action, please refer to the screenshot shown as below:

The expression in "Blob content" is:

base64ToBinary(body('Parse_JSON')?['Document']?['File'])

Hope it helps~

If still have any problem, please feel free to let me know.

edited Feb 12, 2020 at 2:58

answered Feb 12, 2020 at 2:30

Hury Shen

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1 Comment

Mercy Over a year ago

Thank you Hury Shen !!! this function solved the issue base64ToBinary.

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