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  2. Handling Multipart File Uploads in Azure Functions

How do I handle multipart/form-data in Azure Function for file uploads?

Handling Multipart/File Uploads in Azure Functions

In this guide, we will demonstrate how to deploy an Azure Function that handles file uploads using multipart/form-data. We’ll set up the Azure Function infrastructure and the associated Storage Account to store uploaded files.

Let’s walk through the process with an example.

Program Overview

The following example:

  • Sets up an Azure Function App.
  • Configures a Storage Account to store uploaded files.
  • Links the Azure Function App with the Storage Account.
  • Defines stack exports for function endpoint and storage account.
import * as pulumi from "@pulumi/pulumi";
import * as azure from "@pulumi/azure";

// Resource group
const example = new azure.core.ResourceGroup("example", {
    name: "example-resources",
    location: "West Europe",
});
// Storage account for file uploads
const exampleAccount = new azure.storage.Account("example", {
    name: "examplestorageacct",
    resourceGroupName: example.name,
    location: example.location,
    accountTier: "Standard",
    accountReplicationType: "LRS",
});
// App Service plan
const examplePlan = new azure.appservice.Plan("example", {
    name: "example-appserviceplan",
    location: example.location,
    resourceGroupName: example.name,
    sku: {
        tier: "Dynamic",
        size: "Y1",
    },
});
// Azure Function app
const exampleFunctionApp = new azure.appservice.FunctionApp("example", {
    name: "example-functionapp",
    location: example.location,
    resourceGroupName: example.name,
    appServicePlanId: examplePlan.id,
    storageAccountName: exampleAccount.name,
    storageAccountAccessKey: exampleAccount.primaryAccessKey,
    appSettings: {
        FUNCTIONS_WORKER_RUNTIME: "node",
        WEBSITE_RUN_FROM_PACKAGE: "1",
    },
});
export const functionEndpoint = exampleFunctionApp.defaultHostname;
export const storageAccountName = exampleAccount.name;
export const storageAccountKey = exampleAccount.primaryAccessKey;

Key Points

  • Resource Group: Defined to manage all related resources.
  • Storage Account: Configured to store the files being uploaded.
  • App Service Plan: Provides the necessary compute resources.
  • Function App: Configured to respond to HTTP requests and handle file uploads.

Summary

In this example, we provisioned an Azure Function that can handle multipart file uploads. Additionally, a storage account was configured to store the uploaded files. We also exported relevant outputs like function endpoint and storage account credentials for further usage.

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