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To make the authorization checks easier throughout our system, we should create a few helper functions called Guards. These will block requests that are not authorized.
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We've created a handful of
helper functions that allow us
0:00
to reuse code making our
applications easier to maintain.
0:04
For the authorization system of our
application we're going to rely heavily on
0:08
these helper functions.
0:13
When dealing with authorization helper
functions they're sometimes referred to as
0:14
guards.
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A guard is a tool that allows us
to protect certain sections of
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our application.
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We're going to be creating
guards to check the request and
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only allow administrators to view a page.
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This guard will make sure
that a user is logged in and
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that a logged in user is an administrator.
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Finally, we'll create a guard to make
sure that the logged-in user is the owner
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of a book or
a vote that they are trying to edit.
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If you remember, from the last stage,
0:48
we built a function to check if
a request requires authentication.
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This function also used
the isAuthenticated function.
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Yes, both of these functions
are guards as well.
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We're going to build two more guards for
admin.
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This time, not only will we check
that the user is logged in,
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we also need to check for an admin role.
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Let's start with the function to
check if the user is an admin or not.
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We'll name this, function isAdmin.
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We'll start by checking if the user is
authenticated, if not isAuthenticated.
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Then we're going to return false.
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If they're not logged in,
they're not an admin.
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If the user is authenticated we now need
to check if they have an admin role.
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Their role id should equal 1.
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Like we did for
our get authenticated user.
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We can use a session.
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We start with the global, session and
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the we can return, session, get.
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Auth_roles.
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And we'll see if this equals 1.
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This return should give us true or false,
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depending upon whether our
auth_roles equals 1 or not.
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Now we can create the guard that requires
the user to be an administrator or
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gives an error and redirects the user.
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We'll create a new function and
we'll name this requireAdmin.
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We can use the isAdmin function to
tell us if the user is an admin.
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if not isAdmin,
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Then we're going to use the global
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$session, and we're going to
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set $session->getFlashBag()->add('error',
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'Not Authorized').
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And then we'll redirect to login.php.
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Now on any page where we require
administrative privileges we can simply
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add requireAdmin to the top of the page,
and it will handle everything for us.
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There's one more guard
that we want to add.
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We want to set up a function
to check if the user who is
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logged in is the owner of a book or
a vote.
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This function will accept a single
property the id we're trying to match,
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and then it will get the current
logged in user for comparison.
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So we'll add a function,
and we'll name it isOwner.
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We'll accept the ownerId, And
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then we'll start by checking if Not
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isAuthenticated, And we'll return false.
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If they're not logged in,
they can't be the owner.
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Then we can use global session.
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And we're going to return a comparison of
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ownerId, compared with session,
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get, auth_user_id.
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Now with this function,
we can get the owner of the book, or
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a vote from the database, and
pass it to this function,
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which will make sure that the
authenticated user is the actual owner.
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Now that our guards are set up,
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we're ready to start using
them in our application.
5:32
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