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 Apache CouchDB 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.apachecouchdb.ApacheCouchDBDriver

• Provide the JDBC URL. For example:
  

  jdbc:apachecouchdb:User=abc123; Password=abcdef;
  
  or
  
  jdbc:cdata:apachecouchdb:User=abc123; Password=abcdef;

  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:apachecouchdb:" or "jdbc:cdata:apachecouchdb:" and can include any of the connection properties in name-value pairs separated with semicolons.

Connecting to Apache CouchDB

Apache CouchDB supports three types of authentication:

• Basic: Basic username/password authentication.
• JWT: Authentication with JWT token.
• None: Anonymous access for databases that are public.

If you want your users (or JWT tokens) to have access to only specific databases, you have to configure the admin_only_all_dbs option in the Apache CouchDB instance to grant all users access to the "/_all_dbs" endpoint which is required by the driver for listing tables. Otherwise the driver won't be able to connect, because the endpoint will throw an authentication error.

Basic Authentication

Set the following to connect to data:

• AuthScheme: Basic.
• Url: The Url of your Apache CouchDB instance. For example: http://localhost:5984
• User The Apache CouchDB user account used to authenticate.
• Password The Apache CouchDB password associated with the authenticating user.

JWT Authentication

The following connection properties are required and must always be specified:

• AuthScheme: JWT.
• Url: The Url of your Apache CouchDB instance. For example: http://localhost:5984.

From here you can:

1. Set the following so that the driver automatically generates (and refreshes if applicable) the tokens for you:

Required

• JWTSubject: The name of the user to assign to the JWT token.
• JWTAlgorithm: The algorithm to use for the JWT token signature.
• JWTKeyType: The type of the encryption key.
• JWTKey: The encryption key used to sign the JWT token generated by the driver.

Optional

• JWTIssuer: The issuer of the JWT token.
• JWTExpiration: How long the JWT token should remain valid, in seconds.
• JWTHeaders: A collection of extra headers that should be included in the JWT header.
• JWTClaims: A collection of extra claims that should be included in the JWT payload.
• CredentialsLocation: The location of the settings file where the JWT token is saved.

2. Or you can generate the tokens yourself manually and pass them to the driver by using the JWTToken connection property.

Generating the key pair

When using asymmetric algorithms to sign the tokens, you must generate a private/public key pair. For that, a cryptographic library like OpenSSL can be used. For example:

# generate private key
openssl genrsa --out private_rsa256.pem 2048

# extract public key
openssl rsa -in private_rsa256.pem -pubout > public_rsa256.pem

JWT Configurations

Refer to CouchDB JWT Authentication Documentation for the following.

The alg and sub are required claims and will always be validated by the Apache CouchDB instance. Other required claims can be configured in the server (see required_claims). In that case, you must use JWTHeaders and JWTClaims so that the driver can include those additional claims when generating the JWT token.

You can use roles_claim_name or the roles_claim_path options to assign roles to the JWT tokens.

Refer to the following example for configuring the server and the driver:

server configuration

[chttpd]
...
authentication_handlers = {chttpd_auth, jwt_authentication_handler}, {chttpd_auth, cookie_authentication_handler}, {chttpd_auth, default_authentication_handler}
admin_only_all_dbs = false
...

[jwt_auth]
...
required_claims = exp
roles_claim_path = my.nested._couchdb\.roles
rsa:rsa_256 = -----BEGIN PUBLIC KEY-----\nYOUR_PUBLIC_KEY\n-----END PUBLIC KEY-----\n
...

driver configuration

Url=http://localhost:5984;
JWTSubject=JWT User 1;
JWTAlgorithm=RS256;
JWTKeyType=PEMKEY_FILE;
JWTKey=PATH_TO_FOLDER\private_rsa256.pem;
JWTHeaders=kid : rsa_256 | Custom Header 1 : Test 1;
JWTClaims= my : eyJuZXN0ZWQiOnsiX2NvdWNoZGIucm9sZXMiOlsidXNlcjIiXX19 | Custom Claim 1 : Test 1;

Anonymous

Set the following to connect to data:

• AuthScheme: None.
• Url: The Url of your Apache CouchDB instance. For example: http://localhost:5984
• PublicDatabases: A comma-separated list of public databases to list as tables.