REST API Client Generation with OpenAPI Swagger

Secret Server contains an OpenAPI Swagger specification file that describes the REST API endpoints. There are several Swagger-based tools available to generate clients. This document describes using some popular ones to generate clients for different languages including C#, Java, and PowerShell. The generated client facilitates calling the Secret Server REST API and indicates API changes with new Secret Server versions.

Generating Clients

C# Client Using NSwagStudio

1. Download and install NSwagStudio ( https://github.com/RicoSuter/NSwag/wiki/NSwagStudio )

2. Copy and paste the swagger.json file for "Documentation for token authentication." This is located at: {Your SecretServer Base Url}/Documents/restapi/OAuth/swagger.json

3. Suggested settings:

   • Namespace: SecretServerAuthentication
   • Inject HttpClient via constructor
   • Generate default values for properties

4. Generate output.

5. Copy output into a C# file in solution.

6. Copy and paste the swagger.json for "Documentation for REST API using bearer token authentication." It is located at {Your SecretServer Base Url}/Documents/restapi/TokenAuth/swagger.json.

7. Suggested Settings:

   • Namespace: SecretServerRestClient
   • Inject HttpClient via constructor
   • Generate default values for properties

8. Generate output.

9. Copy output into a C# file in solution

   See Authenticating for creating a token to use in the examples below.

   Copy

   // Authenticate:
   var httpClient = new HttpClient();
   var token = "<TOKEN>";
   // Set credentials (token):
   httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
   // Call REST API:
   var client = new SecretServerRestClient.SecretsServiceClient("https://secretserver.url.local/ss/api/v1", httpClient);
   var search = client.SearchAsync(sortBy0_name: "lastHeartBeatStatus", sortBy0_direction:"asc");
   var results = search.Result;

C# or .NET Core Client Using OpenAPI Generator

1. Follow the steps in Getting OpenAPI Generator.

2. Store the path to the relevant swagger.json files as variables. These variables can be either a local file path or a URL.

   $oauthSwagger = 'OAuth/swagger.json'$tokenAuthSwagger = 'TokenAuth/swagger.json'

3. Run the following commands to generate the necessary clients. You can run java -jar openapi-generator-cli.jar help generate to see advanced options that you may wish to configure. Options specific to the .NET Core generator are described on Config Options for csharp-netcore page.

   java -jar openapi-generator-cli.jar generate -i $oauthSwagger -g csharp-netcore --skip-validate-spec --package-name SecretServerOAuth --remove-operation-id-prefix --additional-properties=netCoreProjectFile=true -o oauth-csharpjava -jar openapi-generator-cli.jar generate -i $tokenAuthSwagger -g csharp-netcore --skip-validate-spec --package-name SecretServerTokenAuth --remove-operation-id-prefix --additional-properties=netCoreProjectFile=true -o tokenauth-csharp

4. Build the packages in release mode:

   dotnet build -c Release oauth-csharp/src/SecretServerOAuthdotnet publish -c Release tokenauth-csharp/src/SecretServerTokenAuth

5. Add the necessary .dll files to your project. The DLLs are located at the paths below:

   oauth-csharp/src/SecretServerOAuth/bin/Release/netstandard2.0/SecretServerOAuth.dlltokenauth-csharp/src/SecretServerTokenAuth/bin/Release/netstandard2.0/publish/*.dll

6. Test the API. For example:

   See Authenticating for creating a token to use in the examples below.

   Copy

   var token = "<TOKEN>";
   // Do not use tokenAuthConfig.AccessToken
   // This method can be called repeatedly as the access token expires, old values will be overwritten
   tokenAuthConfig.AddApiKey("Authorization", $"{token.TokenType} {token.AccessToken}");
   var foldersApi = new FoldersApi(tokenAuthConfig);
   var folder = await foldersApi.GetAsync(11);
   Console.WriteLine(folder);Console.ReadKey();

Java Client Using OpenAPI Generator

1. Follow the steps in Getting OpenAPI Generator.

2. Store the path to the relevant swagger.json files as variables. These variables can be either a local file path or a URL.

   $oauthSwagger = 'OAuth/swagger.json'$tokenAuthSwagger = 'TokenAuth/swagger.json'

3. Run the following commands to generate the necessary clients. You can run java -jar openapi-generator-cli.jar help generate to see advanced options that you may wish to configure. Options specific to the Java generator are described on the Config Options for java page.

   java -jar openapi-generator-cli.jar generate -i $oauthSwagger -g java --skip-validate-spec --invoker-package secretserver.oauth.client --api-package secretserver.oauth.api --model-package secretserver.oauth.model --group-id secretserver --artifact-id secretserver.oauth --remove-operation-id-prefix -o oauth-javajava -jar openapi-generator-cli.jar generate -i $tokenAuthSwagger -g java --skip-validate-spec --invoker-package secretserver.tokenauth.client --api-package secretserver.tokenauth.api --model-package secretserver.tokenauth.model --group-id secretserver --artifact-id secretserver.tokenauth --remove-operation-id-prefix -o tokenauth-java

4. Follow the instructions in oauth-java/README.md to include the package in your build process. Alternatively, follow the steps below to generate JAR files and test.

   cd oauth-java mvn clean install -DskipTestscd ..\tokenauth-java mvn clean install -DskipTests

5. Include the following JARs in your project (replace version numbers as necessary):

   oauth-java/target/secretserver.oauth-10.9.9.jartokenauth-java/target/secretserver.tokenauth-10.9.9.jartokenauth-java/target/lib/*.jar

6. Test the JAR files:

   See Authenticating for creating a token to use in the examples below.

   Copy

   // set to the root of the Secret Server instance with no trailing slash
   String basePath = "https://thycotic.com/SecretServer";
   secretserver.oauth.client.ApiClient oauthClient = secretserver.oauth.client.Configuration.getDefaultApiClient();
   secretserver.tokenauth.client.ApiClient tokenAuthClient = secretserver.tokenauth.client.Configuration.getDefaultApiClient();
   String token = "<TOKEN>";tokenAuthClient.setBasePath(basePath + "/api");tokenAuthClient.setApiKey(tokenResponse.getTokenType() + " " + token);
   FoldersApi foldersApi = new FoldersApi(tokenAuthClient);
   FolderModel folderModel = foldersApi.get(11, false, false);
   System.out.println(folderModel);

PowerShell Using OpenAPI Generator

1. Follow the steps in Getting OpenAPI Generator.

2. Store the path to the relevant swagger.json files as variables. These variables can be either a local file path or a URL.

   $oauthSwagger = 'OAuth/swagger.json'$tokenAuthSwagger = 'TokenAuth/swagger.json\'

3. Run the following commands to generate the necessary clients. You can run java -jar openapi-generator-cli.jar help generate to see advanced options that you may wish to configure. Options specific to the PowerShell generator are described on Config Options for powershell page.

   These commands set disallowAdditionalPropertiesIfNotPresent to false to work around a bug in the generator.

   java -jar openapi-generator-cli.jar generate -i $oauthSwagger -g powershell --skip-validate-spec --package-name SecretServerOAuth --remove-operation-id-prefix -o oauth-psjava -jar openapi-generator-cli.jar generate -i $tokenAuthSwagger -g powershell --skip-validate-spec --package-name SecretServerTokenAuth --remove-operation-id-prefix -o tokenauth-ps

4. Perform a find/replace to work around a bug in the generator:

   Get-ChildItem ".\tokenauth-ps\src\SecretServerTokenAuth\Model\*.ps1" | Foreach-Object { (Get-Content $_) | Foreach-Object { $_ -replace "\$AllProperties = \(\)", "$AllProperties = @()" } | Set-Content $_ }

5. Run the following commands to build the PowerShell modules. -Verbose can be specified if desired.

   .\oauth-ps\Build.ps1.\tokenauth-ps\Build.ps1

6. Import both modules:

   Import-Module .\oauth-ps\src\SecretServerOAuthImport-Module .\tokenauth-ps\src\SecretServerTokenAuth

7. Set the base URL of each module. Only edit the first line below. The value must be the full URL to the root of Secret Serverwith no trailing slash, for example https://thycotic.com/SecretServer.

   $baseUrl = "https://thycotic.com/SecretServer"SecretServerOAuth\Set-Configuration -BaseUrl $baseUrlSecretServerTokenAuth\Set-Configuration -BaseUrl $baseUrl

8. Store a token - See Authenticating for creating a token.

9. Set the TokenAuth module to use the token: SecretServerTokenAuth\Set-Configuration -DefaultHeaders @{ Authorization = $token.token_type + " " + $token.access_token }

10. Test the folder service Get endpoint (replace the ID as necessary):

    Get-FolderDetail -id 11

Postman Workspace

Postman is a REST client with a GUI to easily test API requests. To automatically generate a workspace with Secret Server API calls, click the Import button and choose whether to use a local file or a URL. Ensure the Generate a Postman Collection check box is selected. The program appears to be doing nothing while importing, but will inform you of success shortly.

Insomnia Workspace

Insomnia is a REST client similar to Postman. To automatically generate a workspace with Secret Server API calls, first click the arrow to open the dropdown, then click Import/Export. Click Import Data, then From File or From URL as desired.

Getting OpenAPI Generator

OpenAPI Generator supports several installation methods, described on their CLI Installation page. You can pick the method most suitable for your environment. The commands in this article use the JAR method for simplicity, but other installation methods use mostly the same command format so only small tweaking should be required.

Self-Signed or Other Invalid Certificates

If you use an SSL certificate that is self-signed or otherwise not technically valid, OpenAPI Generator throws an error if you try to use a URL to swagger.json instead of a local file (or when using the Java client). To fix this, you need to import the certificate into Java's certificate store. The following example commands are for Windows, but the same concept applies to Mac and Linux as well.

Java 8 stores the cacerts keystore in JAVA_HOME unless it was explicitly changed. keytool should also be on your PATH if java itself is.

keytool -import -keystore "%JAVA_HOME%\jre\lib\security\cacerts" -file "path\to\cert.pem"

Java 11 provides a flag on keytool to find the cacerts keystore automatically.

keytool -import -cacerts -file "path\to\cert.pem"

Swagger 2.0 Notes

Some features in our REST API are not currently supported in Swagger 2.0. For example, the sort is an array of a complex objects. The actual API will accept multiple sort levels by passing this query string, paging.sortBy[0].name=secretname&paging.sortBy[1].name=folderid. The auto-generated client only allows you to specify the first sort by default. To specify multiple sorts, the serialization needs to be customized. We assumed that multiple sorting levels is probably an advanced feature and or choice will work for most.