Java BlobOutput path substitution based on HttpTrigger body

[Lesrac]

Is there a way to modify the "path" for the @BlobOutput annotation inside the code? Use Case: Receiving an XML through an HttpTrigger. Reading stuff out of the received XML would determine how the path inside the BlobOutput should look like, e.g. some base "myblob/" is defined and on top of it we read out of the xml the "senderId" and a "filename". As we do some checks on the XML, we determine that the received body is more "trustworthy" than possible sent headers (and/or the sending party can't be modified to send the needed headers).

Code example:

@Suppress("TooGenericExceptionCaught")
@FunctionName("myRequest")
@StorageAccount("AzureWebJobsBlobSpace")
fun execute(
    @HttpTrigger(
        name = "request",
        methods = [HttpMethod.POST],
        authLevel = AuthorizationLevel.ANONYMOUS
    ) request: HttpRequestMessage<String>, context: ExecutionContext,
    @BlobOutput(
        name = "target",
        path = "myblob/"
    ) outputItem: OutputBinding<String>
): HttpResponseMessage {
    logger.info { "BEGIN request for participant_number '${request.headers["participant_number"] ?: "none"}'" }
    return try {
        val handleRequest = super.handleRequest(request.body, context)
        // use response from handleRequest to determine the blob path
        outputItem.value = request.body
        request
            .createResponseBuilder(HttpStatus.ACCEPTED)
            .body("done")
            .build()
    } catch (e: Exception) {
        handleError(e, request, context)
    }
}

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Document Details

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• ID: 910d4732-bb08-d16a-a932-19c6bd1628c2
• Version Independent ID: af4358c7-cb5c-bdc7-6433-289f47dc186b
• Content: Azure Blob storage output binding for Azure Functions
• Content Source: articles/azure-functions/functions-bindings-storage-blob-output.md
• Service: azure-functions
• GitHub Login: @ggailey777
• Microsoft Alias: glenga

[SaibabaBalapur-MSFT]

@Lesrac Thanks for your feedback! We will investigate and update as appropriate.

[MughundhanRaveendran-MSFT]

@Lesrac , The "path" for the @BlobOutput cannot be changed at runtime as it is a part of the Function definition. You will have to use the blob storage java SDK to write to the blob once you figure out the path

[MughundhanRaveendran-MSFT]

@Lesrac , Hope my answer helps! I will close this issue for now. Feel free to reopen if required