URL format for Spring Security SAML extension

When accessing login URL for a Spring Security SAML based application you can use the following syntax:

https://fqdn-server/context-path/saml/login/alias/url-encoded-sp-alias-name?idp=url-encoded-idp-entity-id

• url-encoded-sp-alias-name is the alias name of the desired Service Provider (the value of <property name="alias" value="sp-alias-name"/>
• url-encoded-idp-entity-id is the entityId value (URL encoded) as defined in IDP meta-data <EntityDescriptor entityID="http://idp.ssocircle.com" xmlns="urn:oasis:names:tc:SAML:2.0:metadata">, http%3A%2F%2Fidp.ssocircle.com in our case

There are at least two scenarios when this feature can be useful:

• Having a single application for multiple companies, each one having it's own internal IDP implementation (each user will access the application through a specific URL containing the appropriate IDP as a query parameter)
• Having a single configuration/single IDP but multiple deployment environments (like development, test, production); different SP aliases will be used to access a specific environment

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