NAME

Dancer2::Plugin::Auth::Extensible::Provider::Usergroup - authenticate as a member of a group

SYNOPSIS

Define that a user must be logged in and have the proper permissions to access a route:

get '/unsubscribe' => require_role forum => sub { ... };

DESCRIPTION

This class is an authentication provider designed to authenticate users against a DBIC schema, using Dancer2::Plugin::DBIC to access a database.

Dancer2::Plugin::Passphrase is used to handle hashed passwords securely; you wouldn't want to store plain text passwords now, would you? (If your answer to that is yes, please reconsider; you really don't want to do that, when it's so easy to do things right!)

See Dancer2::Plugin::DBIC for how to configure a database connection appropriately; see the "CONFIGURATION" section below for how to configure this authentication provider with database details.

See Dancer2::Plugin::Auth::Extensible for details on how to use the authentication framework, including how to use "require_login" and "require_role".

CONFIGURATION

This provider tries to use sensible defaults, so you may not need to provide much configuration if your database tables look similar to those in the "SUGGESTED SCHEMA" section below.

The most basic configuration, assuming defaults for all options, and defining a single authentication realm named 'usergroup':

plugins:
    Auth::Extensible:
        realms:
            usergroup:
                provider: 'Usergroup'

You would still need to have provided suitable database connection details to Dancer2::Plugin::DBIC, of course; see the docs for that plugin for full details, but it could be as simple as, e.g.:

plugins:
    Auth::Extensible:
        realms:
            usergroup:
                provider: 'Usergroup'
                schema_name: 'usergroup'
    DBIC:
        usergroup:
            chema_class: Usergroup::Schema
            dsn: "dbi:SQLite:dbname=/path/to/usergroup.db"

A full example showing all options:

plugins:
    Auth::Extensible:
        realms:
            usergroup:
                provider: 'Usergroup'
                
                # optional schema name for DBIC (default 'default')
                schema_name: 'usergroup'

                # optionally specify names of result sets if they're not the defaults
                # (defaults are 'User' and 'Role')
                user_rset: 'User'
                user_role_rset: 'Role'

                # optionally set the column names (see the SUGGESTED SCHEMA
                # section below for the default names; if you use them, they'll
                # Just Work)
                user_login_name_column: 'login_name'
                user_passphrase_column: 'passphrase'
                user_role_column: 'role'
                
                # optionally set a column name that makes a user useable
                # (not all login names can be used to login)
                user_activated_column: 'activated'

See the main Dancer2::Plugin::Auth::Extensible documentation for how to configure multiple authentication realms.

SUGGESTED SCHEMA

If you use a schema similar to the examples provided here, you should need minimal configuration to get this authentication provider to work for you.

The examples given here should be SQLite-compatible; minimal changes should be required to use them with other database engines.

user table

You'll need a table to store user accounts in, of course. A suggestion is something like:

CREATE TABLE users (
    id INTEGER PRIMARY KEY,
    login_name TEXT UNIQUE NOT NULL,
    passphrase TEXT NOT NULL,
    activated INTEGER
);

You will quite likely want other fields to store e.g. the user's name, email address, etc; all columns from the users table will be returned by the logged_in_user keyword for your convenience.

group table

You'll need a table to store a list of available groups in.

CREATE TABLE groups (
    id INTEGER PRIMARY KEY,
    group_name TEXT UNIQUE NOT NULL
);

membership table

To make users a member you'll need a table to store user <-> group mappings.

CREATE TABLE memberships (
    id INTEGER PRIMARY KEY,
    user_id INTEGER NOT NULL REFERENCES users (id),
    group_id INTEGER NOT NULL REFERENCES groups (id)
  );

role view

Map the user role by name.

CREATE VIEW roles AS
SELECT login_name, group_name AS role
    FROM users
    LEFT JOIN membership ON users.id = memberships.user_id
    LEFT JOIN groups ON groups.id = memberships.group_id
;

indexes

You want your data quickly.

CREATE UNIQUE INDEX login_name ON users (login_name);
CREATE UNIQUE INDEX group_name ON groups (group_name);
CREATE UNIQUE INDEX user_group ON memberships (user_id, group_id);
CREATE INDEX member_user ON memberships (user_id);
CREATE INDEX member_group ON memberships (group_id);

INTERNALS

get_user_details

Used by Dancer2::Plugin::Auth::Extensible

match_password

Used by Dancer2::Plugin::Auth::Extensible

authenticate_user

Used by Dancer2::Plugin::Auth::Extensible

get_user_roles

Used by Dancer2::Plugin::Auth::Extensible

COPYRIGHT

Copyright (c) 2014 Henk van Oers

LICENSE

This library is free software and may be distributed under the same terms as perl itself.

cpanm Dancer2::Plugin::Auth::Extensible::Provider::Usergroup

perl -MCPAN -e shell
install Dancer2::Plugin::Auth::Extensible::Provider::Usergroup