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Policy Wonk is a failing allotment library for any Phoenix or Bung application. It improves your aegis and follows the Elixir way of accomplishing things. Analysis it out on Hex or Github. It’s cool.

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Update: I aloof acquaint v1.0.0-rc.0 to hex. I’ll let it sit for a while for comments, afore authoritative it official. You can get the rc on hex.

PolicyWonk is about absolutely re-written for adaptation 1.0. Afterwards active with it for able-bodied over a year, I accomplished there were a set of issues that acceptable re-opening the basal architecture.

Version 1.0 takes these observations (and more), fixes them, and simplifies the agreement dramatically. It has beneath cipher and is all-embracing simpler and faster.

There is a little assignment to advancement from a earlier versions, but the all-embracing appearance of your cipher will break the same, so the assignment is baby and able-bodied account it.

From actuality down, this column is about the aboriginal version…

Authorization (Auth-Z) is the activity of chief what a user/entity is accustomed to do afterwards they’ve been authenticated.

Policy Wonk encourages you to actualize baby “policy” functions that acknowledgment a yes/no accommodation about whether or not a user (or added resource) has permissions to use your Phoenix action.

These behavior are evaluated in the “plug” stack, so you can accomplish these decisions afore your activity is called. This keeps your activity decisions abandoned from your business logic, and additionally keeps them composable.

The basal accomplish to use Activity Wonk are:

You can accomplish behavior from your router (protecting accomplished swaths of your app with one band of code), or use them in specific controllers.

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Policy Wonk provides three capital plugs.

Decisions are fabricated afore ambassador accomplishments are called, isolating allotment logic, auspicious activity reuse, and abbreviation the allowance of messing Auth-Z up as you advance your controllers.

To get started, we are activity to install Activity Wonk and get some behavior running. First, lets run them from the router, so that you can assure assorted accomplishments with one bung call.

To install Activity Wonk in your Elixir/Phoenix application, add a advertence to it in the deps allocation of your applications mix.exs file.

Don’t balloon to run mix deps.get.

You can get to the assorted Activity Wonk locations here

For your aboriginal policy, let’s accomplish abiding a user is logged in to your app.

I accumulate best of my behavior in the book lib/policy_wonk/policies.ex. Actualize this book now, and ample it in with the cipher below. Change MyApp into article accordant to your app.

Note: I am d you already accept a user model. You will charge to change %MyApp.User{} into article accordant to your app

This activity is a policy…

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The abstraction is that you appraise the capacity of the assigns map in the accepted conn and adjudge whether or not to acquiesce the bung alternation to continue.

If you appetite the activity to succeed, acknowledgment the atom :ok. This is the alone way to announce the activity passed.

If you appetite the activity to fail, acknowledgment annihilation else.

The aboriginal constant PolicyWonk.Enforce passes to your activity function, it passes in the ‘assigns’ map from the accepted conn.

The additional Constant is whatever you appetite to use to analyze the activity and canyon in values. If you aren’t accustomed with Elixir’s activity arrangement matching, you should absorb some time with the books Programming Elixir 1.3 and Elixir in Action. Both of which are excellent.

Think of :current_user as the name of the policy. This could additionally be a tuple such as {:permission, “admin”} or a map or whatever you want.

The policy_error activity at the basal of the policies.ex book is alleged aback one of your behavior allotment annihilation added than :ok.

Unlike a policy, you can anon dispense the conn anesthetized into your policy_error function. You can alter it to addition action, put beam letters cede views, or whatever abroad you ability appetite to do.

The additional constant to your policy_error activity is the non-ok amount you alternate from your policy. You can bout on this parameter, or aloof use it as input.

I like aggregate my basal activity absurdity handlers (unauthorized, not-found, etc.) in a accepted book amid at web/error_handlers.ex. That way I can use these absurdity handlers with both Activity Wonk and Guardian and others…

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This is the MyApp.ErrorHandlers bore alleged from the cipher above. Feel chargeless to do article abroad if you want.

Finally, the point of administration behavior is to stop the bung alternation afore it gets to your action. The PolicyWonk.Enforce bung will automatically alarm Plug.Conn.halt() in the accident of activity failure. Calling halt() in your absurdity handlers is acceptable if they can be alleged from assorted locations, but is bombastic with Activity Wonk.

Add the afterward agreement block to your config/config.exs file.

This tells Activity Wonk to attending in the MyApp.Policies bore for behavior that aren’t begin on the accepted ambassador or router.

Add a alarm to the PolicyWonk.Enforce to a activity in your router like this:

Now, aback any activity comes in to your Phoenix appliance that uses the :browser_session pipeline, your :current_user activity will be acclimated by PolicyWonk.Enforce to adjudge if the activity should be alleged or not.

Try it out.

If you are ambience conn.assigns.current_user about in your bung assemblage (could be the guardian bung or article appliance comeonin), again the activity will canyon and your activity will run.

If conn.assigns.current_user is not set to a user, the the activity will abort and… You should see whatever activity your absurdity abettor chose to take.

Checking that a user has assertive permissions above artlessly actuality active in is a activity that I analysis frequently, beyond abounding controllers. For example, is the user an admin? If so, are they additionally a user admin? Content? Invitations? Can they adapt added users permissions?

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This the permissions activity I use in my apps. It is additionally my best complicated policy. Feel chargeless to address your own, but it is accessible to accept this one, aback I use it a lot.

Put this activity in your lib/policy_wonk/policies.ex file. You should not accept a distinct blanked “admin” permission in your app. I’ve apparent that abused before. Instead, accord altered bodies aloof the akin of admission they need.

A few assumptions: This cipher assumes that your User archetypal has a acreage called :permissions, which is an arrangement of strings. Anniversary cord represents a distinct permission.

For the adulation of sanity, encrypt permissions in the db. Analysis out Cloak.

Because I capital to be able to analysis assorted permissions with a distinct bung call, the perms allotment of the admission tuple can be either a distinct cord or a account of strings. You could alarm it like this…

First, the activity enforces that a current_user has been loaded. If not, it fails with the error_data of :current_user. See loading assets in allotment 2.

Once you accept the current_user, it looks for the permissions field. If it is nil, again acutely the user doesn’t accept the requested permissions.

If the user does accept permissions data, again we charge to accomplish abiding they accept all the strings requested in the admission perms list.

Enum.All? scans the admission account of permissions. Enum.Member? checks that a distinct permission is independent in the user’s permissions field.

If all the requested permissions are present in the user’s permissions field, again the activity returns :ok and the bung assemblage can proceed.

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If any requested permission is missing, again the activity allotment the admission permissions appeal as the approachable absurdity data. In that way you could address a specific absurdity abettor to do article such as logging the bootless permissions.

The final bit makes it so you can canyon a distinct permission in after putting it into an array. Notice that all it does is put the admission non-list amount into a account again canyon it aback into itself.

Examples appliance the permissions policy

Called in a router…

Called in a controller…

In a Phoenix application, you can use guards with your plugs.

This is a astonishing allotment of Elixir cheat that took me a bit to blanket my arch around. Analysis out the Phoenix antecedent if you appetite to dive abysmal in what is activity on.

This agency you can use guards to absolute any activity administration to aloof the accomplishments you want.

I cannot accent abundant how air-conditioned and able this is. I experimented with all sorts of means of calling and acclimation policies. Appliance Elixir analogous to acquisition a activity and activity guards to accept aback to run them acquired all the complication to artlessly abatement away.

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