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plone.session implements secure session management for Zope sites. It can be used directly, or be used as a base for custom session management strategies. In its default configuration plone.sessions uses a secure cryptographic hash based on HMAC_ SHA-1_ to authenticate sessions. The hash is generated using the users login name and a secret stored in the PAS plugin. This has several advantages over other session management systems: * passwords are not send to the server in a cookie on every request, as is done by the *Cookie Auth Helper* * it does not require any ZODB write for sessions, as is needed by the *Session Crumbler*. This allows it to scale very well. * it allows you to invalidate all existing authentication cookies for users by updating the secret. Normally a session cookie is used to track sessions; that means that as long as a user keeps his browser open (and does not explicitly log out) the session remains opens. This can be changed by setting the ``cookie_lifetime`` property of the plugin to the number of seconds the cookie should remain valid *after the moment of login*. Using plone.session ------------------- plone.session only takes care of handling sessions for already authenticated users. This means it can not be used stand-alone: you need to have another PAS plugin, such as the standard *Cookie Auth Helper* to take care of authentication. After a user has been authenticated plone.session can take over via the PAS *credentials update* mechanism. Using custom session authentication ----------------------------------- plone.session delegates the generation and verification of sessions to an ISessionSource adapter. This adapter adapts the PAS plugin and implements four methods: createIdentifier Return an identifier for a userid. An identifier is a standard python string object. verifyIdentifier Verify if an identity corresponds to a valid session. Returns a boolean indicating if the identify is valid. extractLoginName Extract the login name from an identifier. invalidateSession Mark a session for a principal as invalid. A source may not support this, in which case it should return False. plone.session ships with two example adapers: hash and userid. The userid adapter is a trivial example which uses the userid as session identifier. This is very insecure since there is no form of verification at all. DO NOT USE THIS ADAPTER IN YOUR SITE! The hash plugin creates a random secret string which is stored as an attribute on your plugin. It uses this secret to create a SHA1 signature for the user id with the secret as session identifier. This approach has several good qualities: * it allows us to verify that a session identifier was created by this site * there is no need to include passwords in the session idenfitier * it does not need to store anything in Zope itself. This means it works as-is in ZEO setups and can scale very well. There are a few downsides to this approach: * if a users password is changed or disabled session identifiers will continue to work, making it hard to lock out users
Adaptable string interpolation
Provides ${id} style string interpolation using named adapters to look up variables. This is meant to provide a trivially simple template system for clients like plone.app.contentrules. To interpolate a string in context, just follow the pattern: from plone.stringinterp.interfaces import IStringInterpolator IStringInterpolator(context)("Here is the title: ${title}") Substitution of variables that are part of the Dublin Core are provided with the package. To provide additional substitutions, just provide a named adapter implementing interfaces.IStringSubstitution for your context. The adapter name is used for the lookup. You can also wrap your context with IContextWrapper adapter if you need to pass custom messages within your substitutions.
Subrequests for Zope2
plone.subrequest provides a mechanism for issuing subrequests under Zope2.
Integration layer making it possible to load schema definitions from XML