Add BLOB Storing Google Provider document

docs/en/framework/infrastructure/blob-storing/google.md

@@ -0,0 +1,70 @@
+# BLOB Storing Google Provider
+
+BLOB Storing Google Provider can store BLOBs in [Google Cloud Storage](https://cloud.google.com/storage).
+
+> Read the [BLOB Storing document](../blob-storing) to understand how to use the BLOB storing system. This document only covers how to configure containers to use a Google Cloud Storage as the storage provider.
+
+## Installation
+
+Use the ABP CLI to add [Volo.Abp.BlobStoring.Google](https://www.nuget.org/packages/Volo.Abp.BlobStoring.Google) NuGet package to your project:
+
+* Install the [ABP CLI](../../../cli) if you haven't installed before.
+* Open a command line (terminal) in the directory of the `.csproj` file you want to add the `Volo.Abp.BlobStoring.Google` package.
+* Run `abp add-package Volo.Abp.BlobStoring.Google` command.
+
+If you want to do it manually, install the [Volo.Abp.BlobStoring.Google](https://www.nuget.org/packages/Volo.Abp.BlobStoring.Google) NuGet package to your project and add `[DependsOn(typeof(AbpBlobStoringGoogleModule))]` to the [ABP module](../../architecture/modularity/basics.md) class inside your project.
+
+## Configuration
+
+Configuration is done in the `ConfigureServices` method of your [module](../../architecture/modularity/basics.md) class, as explained in the [BLOB Storing document](../blob-storing).
+
+**Example: Configure to use the Google storage provider by default**
+
+````csharp
+Configure<AbpBlobStoringOptions>(options =>
+{
+    options.Containers.ConfigureDefault(container =>
+    {
+        container.UseGoogle(google =>
+        {
+            google.ClientEmail = "your coogle client email";
+            google.ProjectId = "your coogle project id";
+            google.PrivateKey = "your coogle private key";
+            google.Scopes = "your coogle scopes";
+            google.ContainerName = "your coogle container name";
+            google.CreateContainerIfNotExists = true;
+            //google.UseApplicationDefaultCredentials = true; // If you want to use application default credentials
+        });
+    });
+});
+````
+
+> See the [BLOB Storing document](../blob-storing) to learn how to configure this provider for a specific container.
+
+### Options
+
+* **ClientEmail** (string): The client email of the Google service account. You can create a service account and get the client email. Please refer to Google documentation: https://cloud.google.com/iam/docs/service-account-overview
+* **ProjectId** (string): The project ID of the Google service account.
+* **PrivateKey** (string): The private key of the Google service account. You can create a service account and get the private key. Please refer to Google documentation: https://cloud.google.com/iam/docs/keys-create-delete
+* **Scopes** (string): The scopes of the Google service account.
+* **UseApplicationDefaultCredentials** (bool): If `true`, it uses the application default credentials(ADC). Default value is `false`. Please refer to Google documentation: https://cloud.google.com/docs/authentication/provide-credentials-adc
+* **ContainerName** (string): You can specify the container name in Google. If this is not specified, it uses the name of the BLOB container defined with the `BlobContainerName` attribute (see the [BLOB storing document](../blob-storing)). Please note that Google has some **rules for naming containers**. A container name must be a valid DNS name, conforming to the [following naming rules](https://docs.microsoft.com/en-us/rest/api/storageservices/naming-and-referencing-containers--blobs--and-metadata#container-names):
+    * Container names must start or end with a letter or number, and can contain only letters, numbers, and the dash (-) character.
+    * Every dash (-) character must be immediately preceded and followed by a letter or number; consecutive dashes are not permitted in container names.
+    * All letters in a container name must be **lowercase**.
+    * Container names must be from **3** through **63** characters long.
+* **CreateContainerIfNotExists** (bool): Default value is `false`, If a container does not exist in Google, `GoogleBlobProvider` will try to create it.
+
+
+## Google Blob Name Calculator
+
+Google Blob Provider organizes BLOB name and implements some conventions. The full name of a BLOB is determined by the following rules by default:
+
+* Appends `host` string if [current tenant](../../architecture/multi-tenancy) is `null` (or multi-tenancy is disabled for the container - see the [BLOB Storing document](../blob-storing) to learn how to disable multi-tenancy for a container).
+* Appends `tenants/<tenant-id>` string if current tenant is not `null`.
+* Appends the BLOB name.
+
+## Other Services
+
+* `GoogleBlobProvider` is the main service that implements the Google BLOB storage provider, if you want to override/replace it via [dependency injection](../../fundamentals/dependency-injection.md) (don't replace `IBlobProvider` interface, but replace `GoogleBlobProvider` class).
+* `IGoogleBlobNameCalculator` is used to calculate the full BLOB name (that is explained above). It is implemented by the `DefaultGoogleBlobNameCalculator` by default.

docs/en/framework/infrastructure/blob-storing/index.md

@@ -22,6 +22,7 @@ The ABP has already the following storage provider implementations:
 * [Aliyun](./aliyun.md): Stores BLOBs on the [Aliyun Storage Service](https://help.aliyun.com/product/31815.html).
 * [Minio](./minio.md): Stores BLOBs on the [MinIO Object storage](https://min.io/).
 * [Aws](./aws.md): Stores BLOBs on the [Amazon Simple Storage Service](https://aws.amazon.com/s3/).
+* [Google](./google.md): Stores BLOBs on the [Google Cloud Storage](https://cloud.google.com/storage).
 
 More providers will be implemented by the time. You can [request](https://github.com/abpframework/abp/issues/new) it for your favorite provider or [create it yourself](./custom-provider.md) and [contribute](../../../contribution) to the ABP.
 

framework/src/Volo.Abp.BlobStoring.Google/Volo/Abp/BlobStoring/Google/GoogleBlobProvider.cs

@@ -141,6 +141,11 @@ public class GoogleBlobProvider : BlobProviderBase, ITransientDependency
     protected virtual async Task<StorageClient> GetStorageClientClientAsync(BlobProviderArgs args)
     {
         var configuration = args.Configuration.GetGoogleConfiguration();
+        if (configuration.UseApplicationDefaultCredentials)
+        {
+            return await StorageClient.CreateAsync();
+        }
+        
         var googleCredential = GoogleCredential.FromServiceAccountCredential(
             new ServiceAccountCredential(
                 new ServiceAccountCredential.Initializer(configuration.ClientEmail)

framework/src/Volo.Abp.BlobStoring.Google/Volo/Abp/BlobStoring/Google/GoogleBlobProviderConfiguration.cs

@@ -46,6 +46,15 @@ public class GoogleBlobProviderConfiguration
         set => _containerConfiguration.SetConfiguration(GoogleBlobProviderConfigurationNames.Scopes, value);
     }
     
+    /// <summary>
+    /// Use the application default credentials. https://cloud.google.com/docs/authentication/provide-credentials-adc
+    /// Default value: false.
+    /// </summary>
+    public bool UseApplicationDefaultCredentials {
+        get => _containerConfiguration.GetConfigurationOrDefault(GoogleBlobProviderConfigurationNames.UseApplicationDefaultCredentials, false);
+        set => _containerConfiguration.SetConfiguration(GoogleBlobProviderConfigurationNames.UseApplicationDefaultCredentials, value);
+    }
+    
     /// <summary>
     /// The name can only contain lowercase letters, numeric characters, dashes (-), underscores (_), and dots (.). Spaces are not allowed. Names containing dots require verification.
     /// Must start and end with a number or letter.

framework/src/Volo.Abp.BlobStoring.Google/Volo/Abp/BlobStoring/Google/GoogleBlobProviderConfigurationNames.cs

@@ -6,6 +6,7 @@ public static class GoogleBlobProviderConfigurationNames
     public const string ClientEmail = "Google.ClientEmail";
     public const string PrivateKey = "Google.PrivateKey";
     public const string Scopes = "Google.Scopes"; 
+    public const string UseApplicationDefaultCredentials = "Google.ApplicationDefaultCredentials";
     public const string ContainerName = "Google.ContainerName";
     public const string CreateContainerIfNotExists = "Google.CreateContainerIfNotExists";
 }

framework/test/Volo.Abp.BlobStoring.Google.Tests/Volo/Abp/BlobStoring/Google/AbpBlobStoringGoogleTestModule.cs

@@ -53,7 +53,7 @@ public class AbpBlobStoringGoogleTestModule : AbpModule
                 containerConfiguration.UseGoogle(google =>
                 {
                     google.ClientEmail = _clientEmail;
-                    google.ProjectId = _projectId = "wide-origin-296910";
+                    google.ProjectId = _projectId;
                     google.PrivateKey = _privateKey;
                     google.ContainerName = _randomContainerName;
                     google.CreateContainerIfNotExists = true;