JDBC Driver for GraphQL

Build 22.0.8462

Establishing a Connection

Creating a JDBC Data Source

You can create a JDBC data source to connect from your Java application. Creating a JDBC data source based on the CData JDBC Driver for GraphQL consists of three basic steps:

  • Add the driver JAR file to the classpath. The JAR file is located in the lib subfolder of the installation directory. Note that the .lic file must be located in the same folder as the JAR file.
  • Provide the driver class. For example: 
    cdata.jdbc.graphql.GraphQLDriver
  • Provide the JDBC URL. For example: 
    jdbc:graphql:AuthScheme=OAuth;OAuthVersion=2.0;CallbackURL=http://localhost:33333;OauthClientId=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;OAuthAccessTokenURL=https://mysite.com/login/oauth/access_token;

or

jdbc:cdata:graphql:AuthScheme=OAuth;OAuthVersion=2.0;CallbackURL=http://localhost:33333;OauthClientId=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;OAuthAccessTokenURL=https://mysite.com/login/oauth/access_token;

    The second format above can be used whenever there is a conflict in your application between drivers using the same URL format to ensure you are using the CData driver. The URL must start with either "jdbc:graphql:" or "jdbc:cdata:graphql:" and can include any of the connection properties in name-value pairs separated with semicolons.

Connecting to GraphQL

Set the following to connect:

  • URL: Specify the URL of the GraphQL service, for example https://api.example.com/graphql.
  • Location: Set this to the file path containing any custom defined schemas for the GraphQL service.

Authenticating to GraphQL

The driver supports the following types of authentication:

  • Basic
  • OAuth 1.0 & 2.0
  • OAuthPKCE
  • AWS Cognito Credentials:
    • AwsCognitoSrp
    • AwsCognitoBasic

Basic

Set AuthScheme to Basic. You must specify the User and Password of the GraphQL service.

OAuth

In all OAuth flows, you must set AuthScheme to OAuth and OAuthVersion to 1.0 or 2.0. The following sections assume you have done so.

Desktop Applications

After setting the following connection properties, you are ready to connect:

  • OAuthRequestTokenURL: Required for OAuth 1.0. This is the URL where the application makes a request for the request token.
  • OAuthAuthorizationURL: Required for OAuth 1.0 and 2.0. This is the URL where the user logs into the service and grants permissions to the application. In OAuth 1.0 if permissions are granted the request token is authorized.
  • OAuthAccessTokenURL: Required for OAuth 1.0 and 2.0. This is the URL where the request for the access token is made. In OAuth 1.0 the authorized request token is exchanged for the access token.
  • OAuthRefreshTokenURL: Required for OAuth 2.0. In OAuth 2.0 this is the URL where the refresh token is exchanged for a new access token when the old one expires. Note that for your data source this may be the same as the access token URL.
  • OAuthClientId: Set this to the client Id in your application settings. This is also called the consumer key.
  • OAuthClientSecret: Set this to the client secret in your application settings. This is also called the consumer secret.
  • CallbackURL: Set this to http://localhost:33333. If you specified a redirect URL in your application settings, this must match.
  • InitiateOAuth: Set this to GETANDREFRESH. You can use InitiateOAuth to avoid repeating the OAuth exchange and manually setting the access token in the connection string.
When you connect, the driver opens the OAuth endpoint in your default browser. Log in and grant permissions to the application. The driver then completes the OAuth process:

  1. Extracts the access token from the callback URL and authenticates requests.
  2. Refreshes the access token when it expires.
  3. Saves OAuth values in OAuthSettingsLocation. These values persist across connections.

Web Applications

When connecting via a Web application, or if the driver is not authorized to open a browser window, use the provided stored procedures to get and manage the OAuth token values.

Note: You can extend the stored procedure schemas to set defaults for the OAuth URLs or other connection string properties. See Operations for a guide.

Set Up the OAuth Flow

Provide the OAuth URLs to authenticate in the Web flow.

  • OAuthRequestTokenURL: Required for OAuth 1.0. This is the URL where the application makes a request for the request token.
  • OAuthAuthorizationURL: Required for OAuth 1.0 and 2.0. This is the URL where the user logs into the service and grants permissions to the application. In OAuth 1.0 if permissions are granted the request token is authorized.
  • OAuthAccessTokenURL: Required for OAuth 1.0 and 2.0. This is the URL where the request for the access token is made. In OAuth 1.0 the authorized request token is exchanged for the access token.
  • OAuthRefreshTokenURL: Required for OAuth 2.0. In OAuth 2.0 this is the URL where the refresh token is exchanged for a new access token when the old one expires. Note that for your data source this may be the same as the access token URL.
Get an Access Token

In addition to the OAuth URLs, set the following additional connection properties to obtain the OAuthAccessToken:

  • OAuthClientId: Set this to the client Id in your application settings.
  • OAuthClientSecret: Set this to the client secret in your application settings.

You can then call stored procedures to complete the OAuth exchange:

  1. Call the GetOAuthAuthorizationURL stored procedure. Set the AuthMode input to WEB and set the CallbackURL input to the Redirect URI you specified in your application settings. The stored procedure returns the URL to the OAuth endpoint.
  2. Log in and authorize the application. You are redirected back to the callback URL.

  3. Call the GetOAuthAccessToken stored procedure. Set the AuthMode input to WEB.

    In OAuth 1.0, set the Verifier input to the "oauth_verifier" parameter. Extract the verifier code from the callback URL. Additionally, set the AuthToken and AuthSecret to the values returned by GetOAuthAccessToken.

    In OAuth 2.0, set the Verifier input to the "code" parameter in the query string of the callback URL.

Connect to Data and Refresh the Token

The OAuthAccessToken returned by GetOAuthAccessToken has a limited lifetime. To automatically refresh the token, set the following on the first data connection.

OAuth Endpoints

  • OAuthRequestTokenURL
  • OAuthAuthorizationURL
  • OAuthAccessTokenURL
  • OAuthRefreshTokenURL

OAuth Tokens and Keys

  • OAuthClientId
  • OAuthClientSecret
  • OAuthRefreshToken
  • OAuthAccessToken

Alternatively, use the RefreshOAuthAccessToken stored procedure to manually refresh the token.

Initiate OAuth

  • InitiateOAuth: Set this to REFRESH. You can use InitiateOAuth to avoid repeating the OAuth exchange and manually setting the OAuthAccessToken.
  • OAuthSettingsLocation: Set this to the path where the driver saves the OAuth values. These values persist across connections.

On subsequent data connections, set the following:

  • InitiateOAuth
  • OAuthSettingsLocation
  • OAuthRequestTokenURL
  • OAuthAuthorizationURL
  • OAuthAccessTokenURL
  • OAuthRefreshTokenURL

Headless Machines

To create GraphQL data sources on headless servers or other machines on which the driver cannot open a browser, you need to authenticate from another machine. Authentication is a two-step process.

  1. Choose one of two options:
    • Option 1: Obtain the OAuthVerifier value as described in "Obtain and Exchange a Verifier Code" below.
    • Option 2: Install the driver on a machine with an internet browser and transfer the OAuth authentication values after you authenticate through the usual browser-based flow, as described in "Transfer OAuth Settings" below.
  2. Then configure the driver to automatically refresh the access token on the headless machine.

Option 1: Obtain and Exchange a Verifier Code

Set the following properties on the headless machine:

  • InitiateOAuth: Set this to OFF.
  • OAuthClientId: Set this to the application Id in your application settings.
  • OAuthClientSecret: Set this to the application secret in your application settings.

You can then follow the steps below to authenticate from another machine and obtain the OAuthVerifier connection property.

  1. Call the GetOAuthAuthorizationURL stored procedure with the CallbackURL input parameter set to the exact Redirect URI you specified in your application settings.
  2. Save the value of the returned AuthToken and AuthKey if OAuthVersion is set to 1.0. They are used in the next step.
  3. Open the returned URL in a browser. Log in and grant permissions to the driver. You are then redirected to the callback URL, which contains the verifier code.
  4. Save the value of the verifier code. Later, you must set this in the OAuthVerifier connection property.

On the headless machine, set the following connection properties to obtain the OAuth authentication values:

  • OAuthRequestTokenURL: Required for OAuth 1.0. In OAuth 1.0 this is the URL where the application makes a request for the request token.
  • OAuthAuthorizationURL: Required for OAuth 1.0 and 2.0. This is the URL where the user logs into the service and grants permissions to the application. In OAuth 1.0 if permissions are granted the request token is authorized.
  • OAuthAccessTokenURL: Required for OAuth 1.0 and 2.0. This is the URL where the request for the access token is made. In OAuth 1.0 the authorized request token is exchanged for the access token.
  • OAuthRefreshTokenURL: Required for OAuth 2.0. In OAuth 2.0 this is the URL where the refresh token is exchanged for a new access token when the old one expires. Note that for your data source this may be the same as the access token URL.
  • OAuthClientId: Set this to the client Id in your application settings.
  • OAuthClientSecret: Set this to the client secret in your application settings.
  • CallbackURL: Set this to http://localhost:33333. If you specified a redirect URL in your application settings, this must match.
  • InitiateOAuth: Set this to GETANDREFRESH. You can use InitiateOAuth to avoid repeating the OAuth exchange and manually setting the access token in the connection string.

Connect to Data

After the OAuth settings file is generated, set the following properties to connect to data:

  • OAuthSettingsLocation: Set this to the file containing the encrypted OAuth authentication values. Make sure this file gives read and write permissions to the provider to enable the automatic refreshing of the access token.
  • InitiateOAuth: Set this to REFRESH.

Option 2: Transfer OAuth Settings

Follow the steps below to install the driver on another machine, authenticate, and then transfer the resulting OAuth values.

On a second machine, install the driver and connect with the following properties set:

  • OAuthSettingsLocation: Set this to a writable text file.
  • InitiateOAuth: Set this to GETANDREFRESH.
  • OAuthClientId: Set this to the Client Id in your application settings.
  • OAuthClientSecret: Set this to the Client Secret in your application settings.
  • CallbackURL: Set this to the Callback URL in your application settings.

Test the connection to authenticate. The resulting authentication values are written, encrypted, to the path specified by OAuthSettingsLocation. After you have successfully tested the connection, copy the OAuth settings file to your headless machine. On the headless machine, set the following connection properties to connect to data:

  • InitiateOAuth: Set this to REFRESH.
  • OAuthSettingsLocation: Set this to the path to your OAuth settings file. Make sure this file gives read and write permissions to the driver to enable the automatic refreshing of the access token.

OAuthPKCE

NOTE:OAuth Proof Key for Code Exchange (PKCE) is an extension to the OAuth 2.0 Authorization Code flow.

Desktop Applications

After setting the following, you are ready to connect:

  • AuthScheme: Set this to OAuthPKCE.
  • InitiateOAuth: Set this to GETANDREFRESH to avoid making the OAuth exchange manually and manually setting the access token in the connection string.
  • OAuthClientId: Set this to the client Id generated when creating your OAuth application on the GraphQL service.
  • OAuthAuthorizationURL: Set this to the authorization URL for the GraphQL service. This is the URL where the user logs into the service and grants permissions to the OAuth application, for example https://api.example.com/authorize.
  • OAuthAccessTokenURL: Set this to the access token URL for the GraphQL service. This is the URL where the request for the access token is made, for example https://api.example.com/token.
  • OAuthRefreshTokenURL: Set this to the refresh token URL for the GraphQL service. This is the URL where the refresh token is exchanged for a new access token when the old one expires. Note that for your data source this may be the same as the OAuthAccessTokenURL.

When you connect, the driver opens the OAuth authorization endpoint in your default browser. Log in and grant permissions to the application. The driver then completes the OAuth process:

  1. Extracts the authorization code from the callback URL.
  2. Exchanges the authorization code for an access and refresh token.
  3. Refreshes the access token when it expires.
  4. Saves OAuth values in OAuthSettingsLocation. These values persist across connections.

Web Applications

When connecting via a Web application, or if the driver is not authorized to open a browser window, use the provided stored procedures to get and manage the OAuth token values.

Note: You can extend the stored procedure schemas to set defaults for the OAuth URLs or other connection string properties. See Operations for a guide.

Set Up the OAuth Flow

Provide the OAuth URLs to authenticate in the Web flow:

  • OAuthAuthorizationURL: This is the URL where the user logs into the service and grants permissions to the OAuth application.
  • OAuthAccessTokenURL:This is the URL where the request for the access token is made.
  • OAuthRefreshTokenURL: This is the URL where the refresh token is exchanged for a new access token when the old one expires. Note that for your data source this may be the same as the access token URL.
Get an Access Token

In addition to the OAuth URLs, set OAuthClientId to the client Id in your application settings to obtain the OAuthAccessToken.

You can then call stored procedures to complete the OAuth exchange:

  1. Call the GetOAuthAuthorizationURL stored procedure. Set the CallbackURL input to the Redirect URI you specified in your application settings. The stored procedure returns the URL to the GraphQL service's authorization URL and the PKCEVerifier. The PKCEVerifier is a randomly generated value used for security reasons with OAuthPKCE. Save the PKCEVerifier; you need it as an input when executing the GetOAuthAccessToken stored procedure.
  2. Log in and authorize the application. You are redirected back to the callback URL.

  3. Call the GetOAuthAccessToken stored procedure.

    Set the AuthMode input to WEB.

    Set the Verifier input to the value of the "code" parameter in the query string of the callback URL.

    Set the PKCEVerifier input to the value generated after calling the GetOAuthAuthorizationURL stored procedure.

Connect to Data and Refresh the Token

The OAuthAccessToken returned by GetOAuthAccessToken has a limited lifetime. To automatically refresh the token, set the following on the first data connection.

OAuth Endpoints

  • OAuthAuthorizationURL
  • OAuthAccessTokenURL
  • OAuthRefreshTokenURL

OAuth Tokens and Keys

  • OAuthClientId
  • OAuthRefreshToken
  • OAuthAccessToken

Alternatively, use the RefreshOAuthAccessToken stored procedure to manually refresh the token.

Initiate OAuth

  • InitiateOAuth: Set this to REFRESH. You can use InitiateOAuth to avoid repeating the OAuth exchange and manually setting the OAuthAccessToken.
  • OAuthSettingsLocation: Set this to the path where the driver saves the OAuth values. These values persist across connections.

On subsequent data connections, set the following:

  • InitiateOAuth
  • OAuthSettingsLocation
  • OAuthAuthorizationURL
  • OAuthAccessTokenURL
  • OAuthRefreshTokenURL

AWS Cognito Credentials

If you want to use the driver with a user registered in a User Pool in AWS Cognito, set the following properties to authenticate:

  • AuthScheme: Set this to AwsCognitoSrp (recommended). You can also use AwsCognitoBasic.
  • AWSCognitoRegion: Set this to the region of the User Pool.
  • AWSUserPoolId: Set this to the User Pool Id.
  • AWSUserPoolClientAppId: Set this to the User Pool Client App Id.
  • AWSUserPoolClientAppSecret: Set this to the User Pool Client Secret.
  • AWSIdentityPoolId: Set this to the Identity Pool Id of the Identity Pool that is linked with the User Pool.
  • User: Set this to the username of the user registered in the User Pool.
  • Password: Set this to the password of the user registered in the User Pool.

Copyright (c) 2023 CData Software, Inc. - All rights reserved.
Build 22.0.8462