feat: adds azure identity capability

README.md

@@ -35,12 +35,12 @@ To enable the provider, create or edit the file at `./config/plugins.js`.
 This is an example `plugins.js` file for Azure storage:
 
 ```js
-
 module.exports = ({ env }) => ({
   upload: {
     config: {
       provider: "strapi-provider-upload-azure-storage",
       providerOptions: {
+        authType: env("STORAGE_AUTH_TYPE", "default"),
         account: env("STORAGE_ACCOUNT"),
         accountKey: env("STORAGE_ACCOUNT_KEY"),//either account key or sas token is enough to make authentication 
         sasToken: env("STORAGE_ACCOUNT_SAS_TOKEN"),
@@ -55,19 +55,42 @@ module.exports = ({ env }) => ({
   },
 });
 
+// For using azure identities, the correct authType is 'msi' or (provide it in the environment variable)
+
+module.exports = ({ env }) => ({
+  upload: {
+    config: {
+      provider: "strapi-provider-upload-azure-storage",
+      providerOptions: {
+        authType: 'msi',
+        account: env("STORAGE_ACCOUNT"),
+        clientId: env("STORAGE_AZURE_CLIENT_ID"), // optional
+        serviceBaseURL: env("STORAGE_URL"), // optional
+        containerName: env("STORAGE_CONTAINER_NAME"),
+        defaultPath: "assets",
+        cdnBaseURL: env("STORAGE_CDN_URL"), // optional
+        defaultCacheControl: env("STORAGE_CACHE_CONTROL"), // optional
+        removeCN: env("REMOVE_CONTAINER_NAME"), // optional, if you want to remove container name from the URL 
+      },
+    },
+  },
+});
+
 ```
 
-| Property | Required | Description |
-| -------- | -------- | -------- |
-| account | true | Azure account name |
-| accountKey | true | Secret access key |
-| sasToken   | false | SAS Token, either accountKey or SASToken is required |
-| serviceBaseURL  | false     | Base service URL to be used, optional. Defaults to `https://${account}.blob.core.windows.net` |
-| containerName  | true     | Container name |
-| defaultPath  | true     | The path to use when there is none being specified. Defaults to `assets` |
-| cdnBaseURL  | false     | CDN base url |
-| defaultCacheControl  | false     | Cache-Control header value for all uploaded files |
-| removeCN  | false     | Set to true, to remove container name from azure URL |
+| Property            | Required                            | Description                                                                                   |
+| ------------------- | ----------------------------------- | --------------------------------------------------------------------------------------------- |
+| authType            | true                                | Whether to use a SAS key ("default") or an identity ("msi")                                   |
+| account             | true                                | Azure account name                                                                            |
+| accountKey          | if 'authType 'default'              | Secret access key                                                                             |
+| clientId            | false (consumed if 'authType 'msi') | Azure Identity Client ID                                                                      |
+| sasToken            | false                               | SAS Token, either accountKey or SASToken is required if 'authType is 'default'                |
+| serviceBaseURL      | false                               | Base service URL to be used, optional. Defaults to `https://${account}.blob.core.windows.net` |
+| containerName       | true                                | Container name                                                                                |
+| defaultPath         | true                                | The path to use when there is none being specified. Defaults to `assets`                      |
+| cdnBaseURL          | false                               | CDN base url                                                                                  |
+| defaultCacheControl | false                               | Cache-Control header value for all uploaded files                                             |
+| removeCN            | false                               | Set to true, to remove container name from azure URL                                          |
 
 ### Security Middleware Configuration
 

package.json

@@ -6,13 +6,15 @@
   "scripts": {
     "build": "tsc -p tsconfig.json",
     "lint": "eslint . --ext .js,.ts",
+    "lint:fix": "eslint . --ext .js,.ts --fix",
     "prebuild": "rm -rf dist",
     "prepublishOnly": "yarn build"
   },
   "directories": {
     "lib": "./lib"
   },
   "dependencies": {
+    "@azure/identity": "^4.0.0",
     "@azure/storage-blob": "^12.12.0"
   },
   "strapi": {

src/index.ts

@@ -1,3 +1,4 @@
+import { DefaultAzureCredential } from '@azure/identity';
 import {
     AnonymousCredential,
     BlobServiceClient,
@@ -6,10 +7,25 @@ import {
 } from '@azure/storage-blob';
 import internal from 'stream';
 
-type Config = {
-    account: string;
+type Config = DefaultConfig | ManagedIdentityConfig;
+
+type DefaultConfig = {
+    authType: 'default';
     accountKey: string;
     sasToken: string;
+    account: string;
+    serviceBaseURL?: string;
+    containerName: string;
+    defaultPath: string;
+    cdnBaseURL?: string;
+    defaultCacheControl?: string;
+    removeCN?: string;
+};
+
+type ManagedIdentityConfig = {
+    authType: 'msi';
+    clientId?: string;
+    account: string;
     serviceBaseURL?: string;
     containerName: string;
     defaultPath: string;
@@ -43,18 +59,36 @@ function getFileName(path: string, file: StrapiFile) {
 }
 
 function makeBlobServiceClient(config: Config) {
-    const account = trimParam(config.account);
-    const accountKey = trimParam(config.accountKey);
-    const sasToken = trimParam(config.sasToken);
     const serviceBaseURL = getServiceBaseUrl(config);
-    // if accountKey doesn't contain value return below line
-    if (sasToken != '') {
-        const anonymousCredential = new AnonymousCredential();
-        return new BlobServiceClient(`${serviceBaseURL}${sasToken}`, anonymousCredential);
+
+    switch (config.authType) {
+        case 'default': {
+            const account = trimParam(config.account);
+            const accountKey = trimParam(config.accountKey);
+            const sasToken = trimParam(config.sasToken);
+            if (sasToken != '') {
+                const anonymousCredential = new AnonymousCredential();
+                return new BlobServiceClient(`${serviceBaseURL}${sasToken}`, anonymousCredential);
+            }
+            const sharedKeyCredential = new StorageSharedKeyCredential(account, accountKey);
+            const pipeline = newPipeline(sharedKeyCredential);
+            return new BlobServiceClient(serviceBaseURL, pipeline);
+        }
+        case 'msi': {
+            const clientId = trimParam(config.clientId);
+            if (clientId != null && clientId != '') {
+                return new BlobServiceClient(
+                    serviceBaseURL,
+                    new DefaultAzureCredential({ managedIdentityClientId: clientId })
+                );
+            }
+            return new BlobServiceClient(serviceBaseURL, new DefaultAzureCredential());
+        }
+        default: {
+            const exhaustiveCheck: never = config;
+            throw new Error(exhaustiveCheck);
+        }
     }
-    const sharedKeyCredential = new StorageSharedKeyCredential(account, accountKey);
-    const pipeline = newPipeline(sharedKeyCredential);
-    return new BlobServiceClient(serviceBaseURL, pipeline);
 }
 
 const uploadOptions = {
@@ -109,12 +143,20 @@ async function handleDelete(
 module.exports = {
     provider: 'azure',
     auth: {
+        authType: {
+            label: 'Authentication type (required, either "msi" or "default")',
+            type: 'text',
+        },
+        clientId: {
+            label: 'Azure Identity ClientId (consumed if authType is "msi" and passed as DefaultAzureCredential({ managedIdentityClientId: clientId }))',
+            type: 'text',
+        },
         account: {
             label: 'Account name (required)',
             type: 'text',
         },
         accountKey: {
-            label: 'Secret access key (required)',
+            label: 'Secret access key (required if authType is "default")',
             type: 'text',
         },
         serviceBaseURL: {