eBay.OAuth.Client 2.0.0

= eBay OAuth C# Client Library :toc: :toclevels: 4

== Summary To make integrations with eBay RESTful APIs easier, eBay provides client libraries in C# and Java to make it simpler to set up authorization, reduce the amount of code the application developers have to write to get OAuth Access Tokens. This library in addition to functioning as a simple eBay OAuth Client, helps with additional features such as cached App tokens.

== What is OAuth 2.0 https://tools.ietf.org/html/rfc6749[OAuth 2.0] is the industry-standard protocol for authorization to obtain limited access to an HTTP service. All https://developer.ebay.com/docs[eBay RESTful APIs] use the OAuth 2.0 protocol for authorization. OAuth access tokens verify to eBay that a request is coming from a valid client and that the application has the user's authorization to carry out the requests. Learn more about the https://developer.ebay.com/api-docs/static/oauth-tokens.html[OAuth Access Tokens].

== Supported Languages eBay OAuth Client is a class library that targets the .NET Standard 2.0. This library can be used by any .NET implementation that supports 2.0 version of the .NET Standard.

== Add the eBay.OAuth.Client NuGet Package Current Version : 2.0.0

Use of this source code is governed by https://opensource.org/licenses/Apache-2.0[Apache-2.0 license].If you're looking for the latest stable version (2.0.0), you can grab it directly from NuGet.org. [source,xml] https://www.nuget.org/packages/eBay.OAuth.Client

=== NuGet Package Manager UI

• In Solution Explorer, right-click NuGet in .csproj and choose Add Package.
• Search for eBay.OAuth.Client, select that package in the list, and click on Add Package
• Accept the License prompt

=== Package Manager Console

• Use the following command in your project directory, to install the eBay.OAuth.Client package: [source,xml] Install-Package eBay.OAuth.Client -Version 2.0.0

• After the command completes, open the .csproj file to see the added reference: [source, xml] <ItemGroup> <PackageReference Include="eBay.OAuth.Client" Version="2.0.0" /> </ItemGroup>

=== .NET CLI

• Use the following command in your project directory, to install the eBay.OAuth.Client package: [source,xml] dotnet add package eBay.OAuth.Client --version 2.0.0

• After the command completes, open the .csproj file to see the added reference: [source,xml] <ItemGroup> <PackageReference Include="eBay.OAuth.Client" Version="2.0.0" /> </ItemGroup>

=== Paket CLI

• Use the following command in your project directory, to install the eBay.OAuth.Client package: [source,xml] paket add eBay.OAuth.Client --version 2.0.0

• After the command completes, open the .csproj file to see the added reference: [source,xml] <ItemGroup> <PackageReference Include="eBay.OAuth.Client" Version="2.0.0" /> </ItemGroup>

== Build eBay.OAuth.Client DLL from Source

• After cloning the project, you can build the package from the source by executing following script from project directory: [source,shell] ./build.sh

• ebay-oauth-csharp-client.dll will be created at ebay-oauth-csharp-client/bin/Debug/net6.0

== Use the eBay.OAuth.Client in the .NET App

• Create a config http://yaml.org/[YAML] file in your application. The config file should contain your eBay applications keys: App Id, Cert Id & Dev Id. A sample config file is available at https://github.com/ebay/ebay-oauth-csharp-client/blob/master/Tests/ebay-config-sample.yaml[https://github.com/ebay/ebay-oauth-csharp-client/blob/master/Tests/ebay-config-sample.yaml]. Learn more about https://developer.ebay.com/api-docs/static/creating-edp-account.html#Register[creating application keys]. [source, csharp] name: ebay-config api.sandbox.ebay.com: appid: <appid-from-developer-portal> certid: <certid-from-developer-portal> devid: <devid-from-developer-portal> redirecturi: <redirect_uri-from-developer-portal> Api.ebay.com: appid: <appid-from-developer-portal> certid: <certid-from-developer-portal> devid: <devid-from-developer-portal> redirecturi: <redirect_uri-from-developer-portal>

• Once the config file is ready, use following code to load it. It is recommended to load the credentials during startup time (initialization) to prevent runtime delays. [source,csharp] CredentialUtil.Load(“YAML config file path”); or CredentialUtil.Load(System.IO.StreamReader);

• Once the credentials are loaded, call any operation on OAuth2Api.

1. GetApplicationToken: Use this operation when the application request an access token to access their own resources, not on behalf of a user. Learn more about https://developer.ebay.com/api-docs/static/oauth-client-credentials-grant.html[Client Credentials grant flow]. [source,csharp] OAuth2Api.GetApplicationToken(OAuthEnvironment environment, IList<String> scopes)

2. GenerateUserAuthorizationUrl: Use this operation to get the Authorization URL to redirect the user to. Once the user authenticates and approves the consent, the callback needs to be captured by the redirect URL setup by the app. [source,csharp] OAuth2Api.GenerateUserAuthorizationUrl(OAuthEnvironment environment, IList<String> scopes, String state)

3. ExchangeCodeForAccessToken: Use this operation when an application exchanges an authorization code for an access token. After the user authenticates, approves the consent and returns to the application via the redirect URL , the application will get the authorization code from the URL and use it to request an access token. Learn more about https://developer.ebay.com/api-docs/static/oauth-authorization-code-grant.html[Authorization Code grant flow]. [source,csharp] OAuth2Api.ExchangeCodeForAccessToken(OAuthEnvironment environment, String code)

4. GetAccessToken: Usually access tokens are short lived. Use this operation to update the access token. Learn more about https://developer.ebay.com/api-docs/static/oauth-qref-auth-code-grant.html[Using a refresh token to update the access token]. [source, csharp] OAuth2Api.GetAccessToken(OAuthEnvironment environment, String refreshToken, IList<String> scopes)

== Contribution Contributions in terms of patches, features, or comments are always welcome. Refer to link:CONTRIBUTING.adoc[CONTRIBUTING] for guidelines. Submit Github issues for any feature enhancements, bugs, or documentation problems as well as questions and comments.

== License Copyright (c) 2018-2019 eBay Inc.

Use of this source code is governed by a Apache 2.0 license that can be found in the LICENSE file or at https://opensource.org/licenses/Apache-2.0.