web: abstract `rootInterface()?.config?.capabilities.includes()` into `.can()` (#7737)

* This commit abstracts access to the object `rootInterface()?.config?` into a single accessor,
`authentikConfig`, that can be mixed into any AKElement object that requires access to it.

Since access to `rootInterface()?.config?` is _universally_ used for a single (and repetitive)
boolean check, a separate accessor has been provided that converts all calls of the form:

``` javascript
rootInterface()?.config?.capabilities.includes(CapabilitiesEnum.CanImpersonate)
```

into:

``` javascript
this.can(CapabilitiesEnum.CanImpersonate)
```

It does this via a Mixin, `WithCapabilitiesConfig`, which understands that these calls only make
sense in the context of a running, fully configured authentik instance, and that their purpose is to
inform authentik components of a user’s capabilities. The latter is why I don’t feel uncomfortable
turning a function call into a method; we should make it explicit that this is a relationship
between components.

The mixin has a single single field, `[WCC.capabilitiesConfig]`, where its association with the
upper-level configuration is made. If that syntax looks peculiar to you, good! I’ve used an explict
unique symbol as the field name; it is inaccessable an innumerable in the object list. The debugger
shows it only as:

    Symbol(): {
        cacheTimeout: 300
        cacheTimeoutFlows: 300
        cacheTimeoutPolicies: 300
        cacheTimeoutReputation: 300
        capabilities: (5) ['can_save_media', 'can_geo_ip', 'can_impersonate', 'can_debug', 'is_enterprise']
    }

Since you can’t reference it by identity, you can’t write to it. Until every browser supports actual
private fields, this is the best we can do; it does guarantee that field name collisions are
impossible, which is a win.

The mixin takes a second optional boolean; setting this to true will cause any web component using
the mixin to automatically schedule a re-render if the capabilities list changes.

The mixin is also generic; despite the "...into a Lit-Context" in the title, the internals of the
Mixin can be replaced with anything so long as the signature of `.can()` is preserved.

Because this work builds off the work I did to give the Sidebar access to the configuration without
ad-hoc retrieval or prop-drilling, it wasn’t necessary to create a new context for it. That will be
necessary for the following:

TODO:

``` javascript
rootInterface()?.uiConfig;
rootInterface()?.tenant;
me();
```

* web: Added a README with a description of the applications' "mental model," essentially an architectural description.

* web: prettier had opinions about the README

* web: Jens requested that subscription be  by default, and it's the right call.

* This commit abstracts access to the object `rootInterface()?.config?` into a single accessor,
`authentikConfig`, that can be mixed into any AKElement object that requires access to it.

Since access to `rootInterface()?.config?` is _universally_ used for a single (and repetitive)
boolean check, a separate accessor has been provided that converts all calls of the form:

``` javascript
rootInterface()?.config?.capabilities.includes(CapabilitiesEnum.CanImpersonate)
```

into:

``` javascript
this.can(CapabilitiesEnum.CanImpersonate)
```

It does this via a Mixin, `WithCapabilitiesConfig`, which understands that these calls only make
sense in the context of a running, fully configured authentik instance, and that their purpose is to
inform authentik components of a user’s capabilities. The latter is why I don’t feel uncomfortable
turning a function call into a method; we should make it explicit that this is a relationship
between components.

The mixin has a single single field, `[WCC.capabilitiesConfig]`, where its association with the
upper-level configuration is made. If that syntax looks peculiar to you, good! I’ve used an explict
unique symbol as the field name; it is inaccessable an innumerable in the object list. The debugger
shows it only as:

    Symbol(): {
        cacheTimeout: 300
        cacheTimeoutFlows: 300
        cacheTimeoutPolicies: 300
        cacheTimeoutReputation: 300
        capabilities: (5) ['can_save_media', 'can_geo_ip', 'can_impersonate', 'can_debug', 'is_enterprise']
    }

Since you can’t reference it by identity, you can’t write to it. Until every browser supports actual
private fields, this is the best we can do; it does guarantee that field name collisions are
impossible, which is a win.

The mixin takes a second optional boolean; setting this to true will cause any web component using
the mixin to automatically schedule a re-render if the capabilities list changes.

The mixin is also generic; despite the "...into a Lit-Context" in the title, the internals of the
Mixin can be replaced with anything so long as the signature of `.can()` is preserved.

Because this work builds off the work I did to give the Sidebar access to the configuration without
ad-hoc retrieval or prop-drilling, it wasn’t necessary to create a new context for it. That will be
necessary for the following:

TODO:

``` javascript
rootInterface()?.uiConfig;
rootInterface()?.tenant;
me();
```

* web: Added a README with a description of the applications' "mental model," essentially an architectural description.

* web: prettier had opinions about the README

* web: Jens requested that subscription be  by default, and it's the right call.

* web: adjust RAC to point to the (now independent) Interface.

- Also, removed redundant check.

web/README.md

@@ -3,6 +3,92 @@
 This is the default UI for the authentik server. The documentation is going to be a little sparse
 for awhile, but at least let's get started.
 
+# The Theory of the authentik UI
+
+In Peter Naur's 1985 essay [Programming as Theory
+Building](https://pages.cs.wisc.edu/~remzi/Naur.pdf), programming is described as creating a mental
+model of how a program _should_ run, then writing the code to test if the program _can_ run that
+way.
+
+The mental model for the authentik UI is straightforward. There are five "applications" within the
+UI, each with its own base URL, router, and responsibilities, and each application needs as many as
+three contexts in which to run.
+
+The three contexts corresponds to objects in the API's `model` section, so let's use those names.
+
+-   The root `Config`. The root configuration object of the server, containing mostly caching and
+    error reporting information. This is misleading, however; the `Config` object contains some user
+    information, specifically a list of permissions the current user (or "no user") has.
+-   The root `CurrentTenant`. This describes the `Brand` information UIs should use, such as themes,
+    logos, favicon, and specific default flows for logging in, logging out, and recovering a user
+    password.
+-   The current `SessionUser`, the person logged in: username, display name, and various states.
+    (Note: the authentik server permits administrators to "impersonate" any other user in order to
+    debug their authentikation experience. If impersonation is active, the `user` field reflects that
+    user, but it also includes a field, `original`, with the administrator's information.)
+
+(There is a fourth context object, Version, but its use is limited to displaying version information
+and checking for upgrades. Just be aware that you will see it, but you will probably never interact
+with it.)
+
+There are five applications. Two (`loading` and `api-browser`) are trivial applications whose
+insides are provided by third-party libraries (Patternfly and Rapidoc, respectively). The other
+three are actual applications. The descriptions below are wholly from the view of the user's
+experience:
+
+-   `Flow`: From a given URL, displays a form that requests information from the user to accomplish a
+    task. Some tasks require the user to be logged in, but many (such as logging in itself!)
+    obviously do not.
+-   `User`: Provides the user with access to the applications they can access, plus a few user
+    settings.
+-   `Admin`: Provides someone with super-user permissions access to the administrative functions of
+    the authentik server.
+
+**Mental Model**
+
+-   Upon initialization, _every_ authentik UI application fetches `Config` and `CurrentTenant`. `User`
+    and `Admin` will also attempt to load the `SessionUser`; if there is none, the user is kicked out
+    to the `Flow` for logging into authentik itself.
+-   `Config`, `CurrentTenant`, and `SessionUser`, are provided by the `@goauthentik/api` application,
+    not by the codebase under `./web`. (Where you are now).
+-   `Flow`, `User`, and `Admin` are all called `Interfaces` and are found in
+    `./web/src/flow/FlowInterface`, `./web/src/user/UserInterface`, `./web/src/admin/AdminInterface`,
+    respectively.
+
+Inside each of these you will find, in a hierarchal order:
+
+-   The context layer described above
+    -   A theme managing layer
+    -   The orchestration layer:
+        -   web socket handler for server-generated events
+        -   The router
+            -   Individual routes for each vertical slice and its relationship to other objects:
+
+Each slice corresponds to an object table on the server, and each slice _usually_ consists of the
+following:
+
+-   A paginated collection display, usually using the `Table` foundation (found in
+    `./web/src/elements/Table`)
+-   The ability to view an individual object from the collection, which you may be able to:
+    -   Edit
+    -   Delete
+-   A form for creating a new object
+-   Tabs showing that object's relationship to other objects
+    -   Interactive elements for changing or deleting those relationships, or creating new ones.
+    -   The ability to create new objects with which to have that relationship, if they're not part of
+        the core objects (such as User->MFA authenticator apps, since the latter is not a "core" object
+        and has no tab of its own).
+
+We are still a bit "all over the place" with respect to sub-units and common units; there are
+folders `common`, `elements`, and `components`, and ideally they would be:
+
+-   `common`: non-UI related libraries all of our applications need
+-   `elements`: UI elements shared among multiple applications that do not need context
+-   `components`: UI elements shared among multiple that use one or more context
+
+... but at the moment there are some context-sensitive elements, and some UI-related stuff in
+`common`.
+
 # Comments
 
 **NOTE:** The comments in this section are for specific changes to this repository that cannot be

web/src/admin/AdminInterface/AdminInterface.ts

@@ -7,7 +7,7 @@ import {
 import { configureSentry } from "@goauthentik/common/sentry";
 import { me } from "@goauthentik/common/users";
 import { WebsocketClient } from "@goauthentik/common/ws";
-import { Interface } from "@goauthentik/elements/Base";
+import { Interface } from "@goauthentik/elements/Interface";
 import "@goauthentik/elements/ak-locale-context";
 import "@goauthentik/elements/enterprise/EnterpriseStatusBanner";
 import "@goauthentik/elements/messages/MessageContainer";

web/src/admin/AdminInterface/AdminSidebar.ts

@@ -1,23 +1,25 @@
 import { DEFAULT_CONFIG } from "@goauthentik/common/api/config";
 import { EVENT_SIDEBAR_TOGGLE, VERSION } from "@goauthentik/common/constants";
 import { me } from "@goauthentik/common/users";
-import { authentikConfigContext } from "@goauthentik/elements/AuthentikContexts";
 import { AKElement } from "@goauthentik/elements/Base";
+import {
+    CapabilitiesEnum,
+    WithCapabilitiesConfig,
+} from "@goauthentik/elements/Interface/capabilitiesProvider";
 import { ID_REGEX, SLUG_REGEX, UUID_REGEX } from "@goauthentik/elements/router/Route";
 import { getRootStyle } from "@goauthentik/elements/utils/getRootStyle";
 import { spread } from "@open-wc/lit-helpers";
 
-import { consume } from "@lit-labs/context";
 import { msg, str } from "@lit/localize";
 import { TemplateResult, html, nothing } from "lit";
 import { customElement, property, state } from "lit/decorators.js";
 import { map } from "lit/directives/map.js";
 
-import { AdminApi, CapabilitiesEnum, CoreApi, UiThemeEnum, Version } from "@goauthentik/api";
+import { AdminApi, CoreApi, UiThemeEnum, Version } from "@goauthentik/api";
-import type { Config, SessionUser, UserSelf } from "@goauthentik/api";
+import type { SessionUser, UserSelf } from "@goauthentik/api";
 
 @customElement("ak-admin-sidebar")
-export class AkAdminSidebar extends AKElement {
+export class AkAdminSidebar extends WithCapabilitiesConfig(AKElement) {
     @property({ type: Boolean, reflect: true })
     open = true;
 
@@ -27,9 +29,6 @@ export class AkAdminSidebar extends AKElement {
     @state()
     impersonation: UserSelf["username"] | null = null;
 
-    @consume({ context: authentikConfigContext })
-    public config!: Config;
-
     constructor() {
         super();
         new AdminApi(DEFAULT_CONFIG).adminVersionRetrieve().then((version) => {
@@ -200,7 +199,7 @@ export class AkAdminSidebar extends AKElement {
     }
 
     renderEnterpriseMessage() {
-        return this.config?.capabilities.includes(CapabilitiesEnum.IsEnterprise)
+        return this.can(CapabilitiesEnum.IsEnterprise)
             ? html`
                   <ak-sidebar-item>
                       <span slot="label">${msg("Enterprise")}</span>

web/src/admin/admin-overview/AdminOverviewPage.ts

@@ -74,10 +74,7 @@ export class AdminOverviewPage extends AKElement {
     }
 
     render(): TemplateResult {
-        let name = this.user?.user.username;
+        const name = this.user?.user.name ?? this.user?.user.username;
-        if (this.user?.user.name) {
-            name = this.user.user.name;
-        }
         return html`<ak-page-header icon="" header="" description=${msg("General system status")}>
                 <span slot="header"> ${msg(str`Welcome, ${name}.`)} </span>
             </ak-page-header>

web/src/admin/applications/ApplicationForm.ts

@@ -1,13 +1,16 @@
 import "@goauthentik/admin/applications/ProviderSelectModal";
 import { iconHelperText } from "@goauthentik/admin/helperText";
-import { DEFAULT_CONFIG, config } from "@goauthentik/common/api/config";
+import { DEFAULT_CONFIG } from "@goauthentik/common/api/config";
 import { first } from "@goauthentik/common/utils";
 import "@goauthentik/components/ak-file-input";
 import "@goauthentik/components/ak-radio-input";
 import "@goauthentik/components/ak-switch-input";
 import "@goauthentik/components/ak-text-input";
 import "@goauthentik/components/ak-textarea-input";
-import { rootInterface } from "@goauthentik/elements/Base";
+import {
+    CapabilitiesEnum,
+    WithCapabilitiesConfig,
+} from "@goauthentik/elements/Interface/capabilitiesProvider";
 import "@goauthentik/elements/forms/FormGroup";
 import "@goauthentik/elements/forms/HorizontalFormElement";
 import "@goauthentik/elements/forms/ModalForm";
@@ -22,13 +25,7 @@ import { TemplateResult, html } from "lit";
 import { customElement, property, state } from "lit/decorators.js";
 import { ifDefined } from "lit/directives/if-defined.js";
 
-import {
+import { Application, CoreApi, PolicyEngineMode, Provider } from "@goauthentik/api";
-    Application,
-    CapabilitiesEnum,
-    CoreApi,
-    PolicyEngineMode,
-    Provider,
-} from "@goauthentik/api";
 
 import "./components/ak-backchannel-input";
 import "./components/ak-provider-search-input";
@@ -48,7 +45,7 @@ export const policyOptions = [
 ];
 
 @customElement("ak-application-form")
-export class ApplicationForm extends ModelForm<Application, string> {
+export class ApplicationForm extends WithCapabilitiesConfig(ModelForm<Application, string>) {
     constructor() {
         super();
         this.handleConfirmBackchannelProviders = this.handleConfirmBackchannelProviders.bind(this);
@@ -93,8 +90,7 @@ export class ApplicationForm extends ModelForm<Application, string> {
                 applicationRequest: data,
             });
         }
-        const c = await config();
+        if (this.can(CapabilitiesEnum.CanSaveMedia)) {
-        if (c.capabilities.includes(CapabilitiesEnum.CanSaveMedia)) {
             const icon = this.getFormFiles()["metaIcon"];
             if (icon || this.clearIcon) {
                 await new CoreApi(DEFAULT_CONFIG).coreApplicationsSetIconCreate({
@@ -140,21 +136,21 @@ export class ApplicationForm extends ModelForm<Application, string> {
         return html`<form class="pf-c-form pf-m-horizontal">
             <ak-text-input
                 name="name"
-                .value=${this.instance?.name}
+                value=${ifDefined(this.instance?.name)}
                 label=${msg("Name")}
                 required
                 help=${msg("Application's display Name.")}
             ></ak-text-input>
             <ak-text-input
                 name="slug"
-                .value=${this.instance?.slug}
+                value=${ifDefined(this.instance?.slug)}
                 label=${msg("Slug")}
                 required
                 help=${msg("Internal application name used in URLs.")}
             ></ak-text-input>
             <ak-text-input
                 name="group"
-                .value=${this.instance?.group}
+                value=${ifDefined(this.instance?.group)}
                 label=${msg("Group")}
                 help=${msg(
                     "Optionally enter a group name. Applications with identical groups are shown grouped together.",
@@ -163,7 +159,7 @@ export class ApplicationForm extends ModelForm<Application, string> {
             <ak-provider-search-input
                 name="provider"
                 label=${msg("Provider")}
-                .value=${this.instance?.provider}
+                value=${ifDefined(this.instance?.provider ?? undefined)}
                 help=${msg("Select a provider that this application should use.")}
                 blankable
             ></ak-provider-search-input>
@@ -209,11 +205,11 @@ export class ApplicationForm extends ModelForm<Application, string> {
                         )}
                     >
                     </ak-switch-input>
-                    ${rootInterface()?.config?.capabilities.includes(CapabilitiesEnum.CanSaveMedia)
+                    ${this.can(CapabilitiesEnum.CanSaveMedia)
                         ? html`<ak-file-input
                                   label="${msg("Icon")}"
                                   name="metaIcon"
-                                  .value=${this.instance?.metaIcon}
+                                  value=${ifDefined(this.instance?.metaIcon ?? undefined)}
                                   current=${msg("Currently set to:")}
                               ></ak-file-input>
                               ${this.instance?.metaIcon

web/src/admin/flows/FlowForm.ts

@@ -1,8 +1,11 @@
 import { DesignationToLabel, LayoutToLabel } from "@goauthentik/admin/flows/utils";
 import { AuthenticationEnum } from "@goauthentik/api/dist/models/AuthenticationEnum";
-import { DEFAULT_CONFIG, config } from "@goauthentik/common/api/config";
+import { DEFAULT_CONFIG } from "@goauthentik/common/api/config";
 import { first } from "@goauthentik/common/utils";
-import { rootInterface } from "@goauthentik/elements/Base";
+import {
+    CapabilitiesEnum,
+    WithCapabilitiesConfig,
+} from "@goauthentik/elements/Interface/capabilitiesProvider";
 import "@goauthentik/elements/forms/FormGroup";
 import "@goauthentik/elements/forms/HorizontalFormElement";
 import { ModelForm } from "@goauthentik/elements/forms/ModelForm";
@@ -14,7 +17,6 @@ import { customElement, property } from "lit/decorators.js";
 import { ifDefined } from "lit/directives/if-defined.js";
 
 import {
-    CapabilitiesEnum,
     DeniedActionEnum,
     Flow,
     FlowDesignationEnum,
@@ -24,7 +26,7 @@ import {
 } from "@goauthentik/api";
 
 @customElement("ak-flow-form")
-export class FlowForm extends ModelForm<Flow, string> {
+export class FlowForm extends WithCapabilitiesConfig(ModelForm<Flow, string>) {
     async loadInstance(pk: string): Promise<Flow> {
         const flow = await new FlowsApi(DEFAULT_CONFIG).flowsInstancesRetrieve({
             slug: pk,
@@ -54,8 +56,8 @@ export class FlowForm extends ModelForm<Flow, string> {
                 flowRequest: data,
             });
         }
-        const c = await config();
+
-        if (c.capabilities.includes(CapabilitiesEnum.CanSaveMedia)) {
+        if (this.can(CapabilitiesEnum.CanSaveMedia)) {
             const icon = this.getFormFiles()["background"];
             if (icon || this.clearBackground) {
                 await new FlowsApi(DEFAULT_CONFIG).flowsInstancesSetBackgroundCreate({
@@ -340,7 +342,7 @@ export class FlowForm extends ModelForm<Flow, string> {
                             </option>
                         </select>
                     </ak-form-element-horizontal>
-                    ${rootInterface()?.config?.capabilities.includes(CapabilitiesEnum.CanSaveMedia)
+                    ${this.can(CapabilitiesEnum.CanSaveMedia)
                         ? html`<ak-form-element-horizontal
                                   label=${msg("Background")}
                                   name="background"

web/src/admin/groups/GroupViewPage.ts

@@ -118,7 +118,7 @@ export class GroupViewPage extends AKElement {
                                         <div class="pf-c-description-list__text">
                                             <ak-status-label
                                                 type="warning"
-                                                ?good=${this.group.isSuperuser}
+                                                ?good${this.group.isSuperuser}
                                             ></ak-status-label>
                                         </div>
                                     </dd>

web/src/admin/groups/RelatedUserList.ts

@@ -10,6 +10,10 @@ import { uiConfig } from "@goauthentik/common/ui/config";
 import { first } from "@goauthentik/common/utils";
 import "@goauthentik/components/ak-status-label";
 import { rootInterface } from "@goauthentik/elements/Base";
+import {
+    CapabilitiesEnum,
+    WithCapabilitiesConfig,
+} from "@goauthentik/elements/Interface/capabilitiesProvider";
 import "@goauthentik/elements/buttons/ActionButton";
 import "@goauthentik/elements/buttons/Dropdown";
 import "@goauthentik/elements/forms/DeleteBulkForm";
@@ -33,7 +37,6 @@ import PFBanner from "@patternfly/patternfly/components/Banner/banner.css";
 import PFDescriptionList from "@patternfly/patternfly/components/DescriptionList/description-list.css";
 
 import {
-    CapabilitiesEnum,
     CoreApi,
     CoreUsersListTypeEnum,
     Group,
@@ -107,7 +110,7 @@ export class RelatedUserAdd extends Form<{ users: number[] }> {
 }
 
 @customElement("ak-user-related-list")
-export class RelatedUserList extends Table<User> {
+export class RelatedUserList extends WithCapabilitiesConfig(Table<User>) {
     expandable = true;
     checkbox = true;
 
@@ -188,8 +191,7 @@ export class RelatedUserList extends Table<User> {
 
     row(item: User): TemplateResult[] {
         const canImpersonate =
-            rootInterface()?.config?.capabilities.includes(CapabilitiesEnum.CanImpersonate) &&
+            this.can(CapabilitiesEnum.CanImpersonate) && item.pk !== this.me?.user.pk;
-            item.pk !== this.me?.user.pk;
         return [
             html`<a href="#/identity/users/${item.pk}">
                 <div>${item.username}</div>

web/src/admin/sources/oauth/OAuthSourceForm.ts

@@ -4,9 +4,12 @@ import { BaseSourceForm } from "@goauthentik/admin/sources/BaseSourceForm";
 import { UserMatchingModeToLabel } from "@goauthentik/admin/sources/oauth/utils";
 import { DEFAULT_CONFIG, config } from "@goauthentik/common/api/config";
 import { first } from "@goauthentik/common/utils";
-import { rootInterface } from "@goauthentik/elements/Base";
 import "@goauthentik/elements/CodeMirror";
 import { CodeMirrorMode } from "@goauthentik/elements/CodeMirror";
+import {
+    CapabilitiesEnum,
+    WithCapabilitiesConfig,
+} from "@goauthentik/elements/Interface/capabilitiesProvider";
 import "@goauthentik/elements/forms/FormGroup";
 import "@goauthentik/elements/forms/HorizontalFormElement";
 import "@goauthentik/elements/forms/SearchSelect";
@@ -17,7 +20,6 @@ import { customElement, property, state } from "lit/decorators.js";
 import { ifDefined } from "lit/directives/if-defined.js";
 
 import {
-    CapabilitiesEnum,
     FlowsInstancesListDesignationEnum,
     OAuthSource,
     OAuthSourceRequest,
@@ -28,7 +30,7 @@ import {
 } from "@goauthentik/api";
 
 @customElement("ak-source-oauth-form")
-export class OAuthSourceForm extends BaseSourceForm<OAuthSource> {
+export class OAuthSourceForm extends WithCapabilitiesConfig(BaseSourceForm<OAuthSource>) {
     async loadInstance(pk: string): Promise<OAuthSource> {
         const source = await new SourcesApi(DEFAULT_CONFIG).sourcesOauthRetrieve({
             slug: pk,
@@ -318,7 +320,7 @@ export class OAuthSourceForm extends BaseSourceForm<OAuthSource> {
                 />
                 <p class="pf-c-form__helper-text">${placeholderHelperText}</p>
             </ak-form-element-horizontal>
-            ${rootInterface()?.config?.capabilities.includes(CapabilitiesEnum.CanSaveMedia)
+            ${this.can(CapabilitiesEnum.CanSaveMedia)
                 ? html`<ak-form-element-horizontal label=${msg("Icon")} name="icon">
                           <input type="file" value="" class="pf-c-form-control" />
                           ${this.instance?.icon

web/src/admin/sources/plex/PlexSourceForm.ts

@@ -2,10 +2,13 @@ import "@goauthentik/admin/common/ak-flow-search/ak-source-flow-search";
 import { iconHelperText, placeholderHelperText } from "@goauthentik/admin/helperText";
 import { BaseSourceForm } from "@goauthentik/admin/sources/BaseSourceForm";
 import { UserMatchingModeToLabel } from "@goauthentik/admin/sources/oauth/utils";
-import { DEFAULT_CONFIG, config } from "@goauthentik/common/api/config";
+import { DEFAULT_CONFIG } from "@goauthentik/common/api/config";
 import { PlexAPIClient, PlexResource, popupCenterScreen } from "@goauthentik/common/helpers/plex";
 import { ascii_letters, digits, first, randomString } from "@goauthentik/common/utils";
-import { rootInterface } from "@goauthentik/elements/Base";
+import {
+    CapabilitiesEnum,
+    WithCapabilitiesConfig,
+} from "@goauthentik/elements/Interface/capabilitiesProvider";
 import "@goauthentik/elements/forms/FormGroup";
 import "@goauthentik/elements/forms/HorizontalFormElement";
 import "@goauthentik/elements/forms/SearchSelect";
@@ -16,7 +19,6 @@ import { customElement, property, state } from "lit/decorators.js";
 import { ifDefined } from "lit/directives/if-defined.js";
 
 import {
-    CapabilitiesEnum,
     FlowsInstancesListDesignationEnum,
     PlexSource,
     SourcesApi,
@@ -24,7 +26,7 @@ import {
 } from "@goauthentik/api";
 
 @customElement("ak-source-plex-form")
-export class PlexSourceForm extends BaseSourceForm<PlexSource> {
+export class PlexSourceForm extends WithCapabilitiesConfig(BaseSourceForm<PlexSource>) {
     async loadInstance(pk: string): Promise<PlexSource> {
         const source = await new SourcesApi(DEFAULT_CONFIG).sourcesPlexRetrieve({
             slug: pk,
@@ -63,8 +65,7 @@ export class PlexSourceForm extends BaseSourceForm<PlexSource> {
                 plexSourceRequest: data,
             });
         }
-        const c = await config();
+        if (this.can(CapabilitiesEnum.CanSaveMedia)) {
-        if (c.capabilities.includes(CapabilitiesEnum.CanSaveMedia)) {
             const icon = this.getFormFiles()["icon"];
             if (icon || this.clearIcon) {
                 await new SourcesApi(DEFAULT_CONFIG).sourcesAllSetIconCreate({
@@ -255,7 +256,7 @@ export class PlexSourceForm extends BaseSourceForm<PlexSource> {
                 />
                 <p class="pf-c-form__helper-text">${placeholderHelperText}</p>
             </ak-form-element-horizontal>
-            ${rootInterface()?.config?.capabilities.includes(CapabilitiesEnum.CanSaveMedia)
+            ${this.can(CapabilitiesEnum.CanSaveMedia)
                 ? html`<ak-form-element-horizontal label=${msg("Icon")} name="icon">
                           <input type="file" value="" class="pf-c-form-control" />
                           ${this.instance?.icon

web/src/admin/sources/saml/SAMLSourceForm.ts

@@ -5,7 +5,10 @@ import { BaseSourceForm } from "@goauthentik/admin/sources/BaseSourceForm";
 import { UserMatchingModeToLabel } from "@goauthentik/admin/sources/oauth/utils";
 import { DEFAULT_CONFIG, config } from "@goauthentik/common/api/config";
 import { first } from "@goauthentik/common/utils";
-import { rootInterface } from "@goauthentik/elements/Base";
+import {
+    CapabilitiesEnum,
+    WithCapabilitiesConfig,
+} from "@goauthentik/elements/Interface/capabilitiesProvider";
 import "@goauthentik/elements/forms/FormGroup";
 import "@goauthentik/elements/forms/HorizontalFormElement";
 import "@goauthentik/elements/forms/Radio";
@@ -18,7 +21,6 @@ import { ifDefined } from "lit/directives/if-defined.js";
 
 import {
     BindingTypeEnum,
-    CapabilitiesEnum,
     DigestAlgorithmEnum,
     FlowsInstancesListDesignationEnum,
     NameIdPolicyEnum,
@@ -29,7 +31,7 @@ import {
 } from "@goauthentik/api";
 
 @customElement("ak-source-saml-form")
-export class SAMLSourceForm extends BaseSourceForm<SAMLSource> {
+export class SAMLSourceForm extends WithCapabilitiesConfig(BaseSourceForm<SAMLSource>) {
     @state()
     clearIcon = false;
 
@@ -149,7 +151,7 @@ export class SAMLSourceForm extends BaseSourceForm<SAMLSource> {
                     </option>
                 </select>
             </ak-form-element-horizontal>
-            ${rootInterface()?.config?.capabilities.includes(CapabilitiesEnum.CanSaveMedia)
+            ${this.can(CapabilitiesEnum.CanSaveMedia)
                 ? html`<ak-form-element-horizontal label=${msg("Icon")} name="icon">
                           <input type="file" value="" class="pf-c-form-control" />
                           ${this.instance?.icon

web/src/admin/users/UserListPage.ts

@@ -12,6 +12,10 @@ import { DefaultUIConfig, uiConfig } from "@goauthentik/common/ui/config";
 import { first } from "@goauthentik/common/utils";
 import "@goauthentik/components/ak-status-label";
 import { rootInterface } from "@goauthentik/elements/Base";
+import {
+    CapabilitiesEnum,
+    WithCapabilitiesConfig,
+} from "@goauthentik/elements/Interface/capabilitiesProvider";
 import { PFSize } from "@goauthentik/elements/Spinner";
 import "@goauthentik/elements/TreeView";
 import "@goauthentik/elements/buttons/ActionButton";
@@ -33,14 +37,7 @@ import PFAlert from "@patternfly/patternfly/components/Alert/alert.css";
 import PFCard from "@patternfly/patternfly/components/Card/card.css";
 import PFDescriptionList from "@patternfly/patternfly/components/DescriptionList/description-list.css";
 
-import {
+import { CoreApi, ResponseError, SessionUser, User, UserPath } from "@goauthentik/api";
-    CapabilitiesEnum,
-    CoreApi,
-    ResponseError,
-    SessionUser,
-    User,
-    UserPath,
-} from "@goauthentik/api";
 
 export const requestRecoveryLink = (user: User) =>
     new CoreApi(DEFAULT_CONFIG)
@@ -93,7 +90,7 @@ const recoveryButtonStyles = css`
 `;
 
 @customElement("ak-user-list")
-export class UserListPage extends TablePage<User> {
+export class UserListPage extends WithCapabilitiesConfig(TablePage<User>) {
     expandable = true;
     checkbox = true;
 
@@ -244,8 +241,7 @@ export class UserListPage extends TablePage<User> {
 
     row(item: User): TemplateResult[] {
         const canImpersonate =
-            rootInterface()?.config?.capabilities.includes(CapabilitiesEnum.CanImpersonate) &&
+            this.can(CapabilitiesEnum.CanImpersonate) && item.pk !== this.me?.user.pk;
-            item.pk !== this.me?.user.pk;
         return [
             html`<a href="#/identity/users/${item.pk}">
                     <div>${item.username}</div>

web/src/admin/users/UserViewPage.ts

@@ -22,8 +22,9 @@ import {
 import "@goauthentik/components/ak-status-label";
 import "@goauthentik/components/events/ObjectChangelog";
 import "@goauthentik/components/events/UserEvents";
-import { AKElement, rootInterface } from "@goauthentik/elements/Base";
+import { AKElement } from "@goauthentik/elements/Base";
 import "@goauthentik/elements/CodeMirror";
+import { WithCapabilitiesConfig } from "@goauthentik/elements/Interface/capabilitiesProvider";
 import "@goauthentik/elements/PageHeader";
 import { PFSize } from "@goauthentik/elements/Spinner";
 import "@goauthentik/elements/Tabs";
@@ -60,7 +61,7 @@ import {
 import "./UserDevicesTable";
 
 @customElement("ak-user-view")
-export class UserViewPage extends AKElement {
+export class UserViewPage extends WithCapabilitiesConfig(AKElement) {
     @property({ type: Number })
     set userId(id: number) {
         me().then((me) => {
@@ -163,8 +164,7 @@ export class UserViewPage extends AKElement {
 
     renderActionButtons(user: User) {
         const canImpersonate =
-            rootInterface()?.config?.capabilities.includes(CapabilitiesEnum.CanImpersonate) &&
+            this.can(CapabilitiesEnum.CanImpersonate) && user.pk !== this.me?.user.pk;
-            user.pk !== this.me?.user.pk;
 
         return html`<div class="ak-button-collection">
             <ak-forms-modal>

web/src/elements/Base.ts

@@ -1,20 +1,18 @@
-import { config, tenant } from "@goauthentik/common/api/config";
 import { EVENT_THEME_CHANGE } from "@goauthentik/common/constants";
-import { UIConfig, uiConfig } from "@goauthentik/common/ui/config";
+import { UIConfig } from "@goauthentik/common/ui/config";
 import { adaptCSS } from "@goauthentik/common/utils";
-import { authentikConfigContext } from "@goauthentik/elements/AuthentikContexts";
+import { ensureCSSStyleSheet } from "@goauthentik/elements/utils/ensureCSSStyleSheet";
 
-import { ContextProvider } from "@lit-labs/context";
 import { localized } from "@lit/localize";
-import { CSSResult, LitElement } from "lit";
+import { LitElement } from "lit";
-import { state } from "lit/decorators.js";
 
 import AKGlobal from "@goauthentik/common/styles/authentik.css";
 import ThemeDark from "@goauthentik/common/styles/theme-dark.css";
-import PFBase from "@patternfly/patternfly/patternfly-base.css";
 
 import { Config, CurrentTenant, UiThemeEnum } from "@goauthentik/api";
 
+import { AdoptedStyleSheetsElement } from "./types";
+
 type AkInterface = HTMLElement & {
     getTheme: () => Promise<UiThemeEnum>;
     tenant?: CurrentTenant;
@@ -25,13 +23,6 @@ type AkInterface = HTMLElement & {
 export const rootInterface = <T extends AkInterface>(): T | undefined =>
     (document.body.querySelector("[data-ak-interface-root]") as T) ?? undefined;
 
-export function ensureCSSStyleSheet(css: CSSStyleSheet | CSSResult): CSSStyleSheet {
-    if (css instanceof CSSResult) {
-        return css.styleSheet!;
-    }
-    return css;
-}
-
 let css: Promise<string[]> | undefined;
 function fetchCustomCSS(): Promise<string[]> {
     if (!css) {
@@ -52,10 +43,6 @@ function fetchCustomCSS(): Promise<string[]> {
     return css;
 }
 
-export interface AdoptedStyleSheetsElement {
-    adoptedStyleSheets: readonly CSSStyleSheet[];
-}
-
 const QUERY_MEDIA_COLOR_LIGHT = "(prefers-color-scheme: light)";
 
 @localized()
@@ -175,49 +162,3 @@ export class AKElement extends LitElement {
         this.requestUpdate();
     }
 }
-
-export class Interface extends AKElement implements AkInterface {
-    @state()
-    tenant?: CurrentTenant;
-
-    @state()
-    uiConfig?: UIConfig;
-
-    _configContext = new ContextProvider(this, {
-        context: authentikConfigContext,
-        initialValue: undefined,
-    });
-
-    _config?: Config;
-
-    @state()
-    set config(c: Config) {
-        this._config = c;
-        this._configContext.setValue(c);
-        this.requestUpdate();
-    }
-
-    get config(): Config | undefined {
-        return this._config;
-    }
-
-    constructor() {
-        super();
-        document.adoptedStyleSheets = [...document.adoptedStyleSheets, ensureCSSStyleSheet(PFBase)];
-        tenant().then((tenant) => (this.tenant = tenant));
-        config().then((config) => (this.config = config));
-        this.dataset.akInterfaceRoot = "true";
-    }
-
-    _activateTheme(root: AdoptedStyleSheetsElement, theme: UiThemeEnum): void {
-        super._activateTheme(root, theme);
-        super._activateTheme(document, theme);
-    }
-
-    async getTheme(): Promise<UiThemeEnum> {
-        if (!this.uiConfig) {
-            this.uiConfig = await uiConfig();
-        }
-        return this.uiConfig.theme?.base || UiThemeEnum.Automatic;
-    }
-}

web/src/elements/Interface/Interface.ts

@@ -0,0 +1,67 @@
+import { config, tenant } from "@goauthentik/common/api/config";
+import { UIConfig, uiConfig } from "@goauthentik/common/ui/config";
+import { authentikConfigContext } from "@goauthentik/elements/AuthentikContexts";
+import type { AdoptedStyleSheetsElement } from "@goauthentik/elements/types";
+import { ensureCSSStyleSheet } from "@goauthentik/elements/utils/ensureCSSStyleSheet";
+
+import { ContextProvider } from "@lit-labs/context";
+import { state } from "lit/decorators.js";
+
+import PFBase from "@patternfly/patternfly/patternfly-base.css";
+
+import { Config, CurrentTenant, UiThemeEnum } from "@goauthentik/api";
+
+import { AKElement } from "../Base";
+
+type AkInterface = HTMLElement & {
+    getTheme: () => Promise<UiThemeEnum>;
+    tenant?: CurrentTenant;
+    uiConfig?: UIConfig;
+    config?: Config;
+};
+
+export class Interface extends AKElement implements AkInterface {
+    @state()
+    tenant?: CurrentTenant;
+
+    @state()
+    uiConfig?: UIConfig;
+
+    _configContext = new ContextProvider(this, {
+        context: authentikConfigContext,
+        initialValue: undefined,
+    });
+
+    _config?: Config;
+
+    @state()
+    set config(c: Config) {
+        this._config = c;
+        this._configContext.setValue(c);
+        this.requestUpdate();
+    }
+
+    get config(): Config | undefined {
+        return this._config;
+    }
+
+    constructor() {
+        super();
+        document.adoptedStyleSheets = [...document.adoptedStyleSheets, ensureCSSStyleSheet(PFBase)];
+        tenant().then((tenant) => (this.tenant = tenant));
+        config().then((config) => (this.config = config));
+        this.dataset.akInterfaceRoot = "true";
+    }
+
+    _activateTheme(root: AdoptedStyleSheetsElement, theme: UiThemeEnum): void {
+        super._activateTheme(root, theme);
+        super._activateTheme(document, theme);
+    }
+
+    async getTheme(): Promise<UiThemeEnum> {
+        if (!this.uiConfig) {
+            this.uiConfig = await uiConfig();
+        }
+        return this.uiConfig.theme?.base || UiThemeEnum.Automatic;
+    }
+}

web/src/elements/Interface/authentikConfigProvider.ts

@@ -0,0 +1,20 @@
+import { authentikConfigContext } from "@goauthentik/elements/AuthentikContexts";
+
+import { consume } from "@lit-labs/context";
+import type { LitElement } from "lit";
+
+import type { Config } from "@goauthentik/api";
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+type Constructor<T = object> = new (...args: any[]) => T;
+
+export function WithAuthentikConfig<T extends Constructor<LitElement>>(
+    superclass: T,
+    subscribe = true,
+) {
+    class WithAkConfigProvider extends superclass {
+        @consume({ context: authentikConfigContext, subscribe })
+        public authentikConfig!: Config;
+    }
+    return WithAkConfigProvider;
+}

web/src/elements/Interface/capabilitiesProvider.ts

@@ -0,0 +1,69 @@
+import { authentikConfigContext } from "@goauthentik/elements/AuthentikContexts";
+
+import { consume } from "@lit-labs/context";
+import type { LitElement } from "lit";
+
+import { CapabilitiesEnum } from "@goauthentik/api";
+import { Config } from "@goauthentik/api";
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+type Constructor<T = object> = abstract new (...args: any[]) => T;
+
+// Using a unique, lexically scoped, and locally static symbol as the field name for the context
+// means that it's inaccessible to any child class looking for it. It's one of the strongest privacy
+// guarantees in JavaScript.
+
+class WCC {
+    public static readonly capabilitiesConfig: unique symbol = Symbol();
+}
+
+/**
+ * withCapabilitiesContext mixes in a single method to any LitElement, `can()`, which takes a
+ * CapabilitiesEnum and returns true or false.
+ *
+ * Usage:
+ *
+ * After importing, simply mixin this function:
+ *
+ * ```
+ * export class AkMyNiftyNewFeature extends withCapabilitiesContext(AKElement) {
+ * ```
+ *
+ * And then if you need to check on a capability:
+ *
+ * ```
+ * if (this.can(CapabilitiesEnum.IsEnterprise) { ... }
+ * ```
+ *
+ * This code re-exports CapabilitiesEnum, so you won't have to import it on a separate line if you
+ * don't need anything else from the API.
+ *
+ * Passing `true` as the second mixin argument will cause the inheriting class to subscribe to the
+ * configuration context. Should the context be explicitly reset, all active web components that are
+ * currently active and subscribed to the context will automatically have a `requestUpdate()`
+ * triggered with the new configuration.
+ *
+ */
+
+export function WithCapabilitiesConfig<T extends Constructor<LitElement>>(
+    superclass: T,
+    subscribe = true,
+) {
+    abstract class CapabilitiesContext extends superclass {
+        @consume({ context: authentikConfigContext, subscribe })
+        private [WCC.capabilitiesConfig]!: Config;
+
+        can(c: CapabilitiesEnum) {
+            if (!this[WCC.capabilitiesConfig]) {
+                throw new Error(
+                    "ConfigContext: Attempted to access site configuration before initialization.",
+                );
+            }
+            return this[WCC.capabilitiesConfig].capabilities.includes(c);
+        }
+    }
+
+    return CapabilitiesContext;
+}
+
+export { CapabilitiesEnum };

web/src/elements/Interface/index.ts

@@ -0,0 +1,4 @@
+import { Interface } from "./Interface";
+
+export { Interface };
+export default Interface;

web/src/elements/types.ts

@@ -0,0 +1,3 @@
+export interface AdoptedStyleSheetsElement {
+    adoptedStyleSheets: readonly CSSStyleSheet[];
+}

web/src/elements/utils/ensureCSSStyleSheet.ts

@@ -0,0 +1,4 @@
+import { CSSResult } from "lit";
+
+export const ensureCSSStyleSheet = (css: CSSStyleSheet | CSSResult): CSSStyleSheet =>
+    css instanceof CSSResult ? css.styleSheet! : css;

web/src/enterprise/rac/index.ts

@@ -1,5 +1,5 @@
 import { TITLE_DEFAULT } from "@goauthentik/app/common/constants";
-import { Interface } from "@goauthentik/elements/Base";
+import { Interface } from "@goauthentik/elements/Interface";
 import "@goauthentik/elements/LoadingOverlay";
 import Guacamole from "guacamole-common-js";
 

web/src/flow/FlowExecutor.ts

@@ -8,7 +8,7 @@ import { globalAK } from "@goauthentik/common/global";
 import { configureSentry } from "@goauthentik/common/sentry";
 import { first } from "@goauthentik/common/utils";
 import { WebsocketClient } from "@goauthentik/common/ws";
-import { Interface } from "@goauthentik/elements/Base";
+import { Interface } from "@goauthentik/elements/Interface";
 import "@goauthentik/elements/LoadingOverlay";
 import "@goauthentik/elements/ak-locale-context";
 import "@goauthentik/flow/sources/apple/AppleLoginInit";

web/src/flow/stages/prompt/PromptStage.ts

@@ -1,6 +1,9 @@
-import { rootInterface } from "@goauthentik/elements/Base";
 import "@goauthentik/elements/Divider";
 import "@goauthentik/elements/EmptyState";
+import {
+    CapabilitiesEnum,
+    WithCapabilitiesConfig,
+} from "@goauthentik/elements/Interface/capabilitiesProvider";
 import { LOCALES } from "@goauthentik/elements/ak-locale-context/definitions";
 import "@goauthentik/elements/forms/FormElement";
 import { BaseStage } from "@goauthentik/flow/stages/base";
@@ -20,7 +23,6 @@ import PFTitle from "@patternfly/patternfly/components/Title/title.css";
 import PFBase from "@patternfly/patternfly/patternfly-base.css";
 
 import {
-    CapabilitiesEnum,
     PromptChallenge,
     PromptChallengeResponseRequest,
     PromptTypeEnum,
@@ -28,7 +30,9 @@ import {
 } from "@goauthentik/api";
 
 @customElement("ak-stage-prompt")
-export class PromptStage extends BaseStage<PromptChallenge, PromptChallengeResponseRequest> {
+export class PromptStage extends WithCapabilitiesConfig(
+    BaseStage<PromptChallenge, PromptChallengeResponseRequest>,
+) {
     static get styles(): CSSResult[] {
         return [
             PFBase,
@@ -193,10 +197,7 @@ ${prompt.initialValue}</textarea
                     </div> `;
                 })}`;
             case PromptTypeEnum.AkLocale: {
-                const inDebug = rootInterface()?.config?.capabilities.includes(
+                const locales = this.can(CapabilitiesEnum.CanDebug)
-                    CapabilitiesEnum.CanDebug,
-                );
-                const locales = inDebug
                     ? LOCALES
                     : LOCALES.filter((locale) => locale.code !== "debug");
                 const options = locales.map(

web/src/standalone/api-browser/index.ts

@@ -2,7 +2,7 @@ import { CSRFHeaderName } from "@goauthentik/common/api/middleware";
 import { EVENT_THEME_CHANGE } from "@goauthentik/common/constants";
 import { globalAK } from "@goauthentik/common/global";
 import { first, getCookie } from "@goauthentik/common/utils";
-import { Interface } from "@goauthentik/elements/Base";
+import { Interface } from "@goauthentik/elements/Interface";
 import "@goauthentik/elements/ak-locale-context";
 import { DefaultTenant } from "@goauthentik/elements/sidebar/SidebarBrand";
 import "rapidoc";

web/src/standalone/loading/index.ts

@@ -1,5 +1,5 @@
 import { globalAK } from "@goauthentik/common/global";
-import { Interface } from "@goauthentik/elements/Base";
+import { Interface } from "@goauthentik/elements/Interface";
 
 import { msg } from "@lit/localize";
 import { CSSResult, TemplateResult, css, html } from "lit";

web/src/stories/interface.ts

@@ -1,4 +1,4 @@
-import { Interface } from "@goauthentik/app/elements/Base";
+import { Interface } from "@goauthentik/app/elements/Interface";
 
 import { customElement, property } from "lit/decorators.js";
 

web/src/user/UserInterface.ts

@@ -9,7 +9,7 @@ import { UserDisplay } from "@goauthentik/common/ui/config";
 import { me } from "@goauthentik/common/users";
 import { first } from "@goauthentik/common/utils";
 import { WebsocketClient } from "@goauthentik/common/ws";
-import { Interface } from "@goauthentik/elements/Base";
+import { Interface } from "@goauthentik/elements/Interface";
 import "@goauthentik/elements/ak-locale-context";
 import "@goauthentik/elements/buttons/ActionButton";
 import "@goauthentik/elements/enterprise/EnterpriseStatusBanner";