[CORL-824] Feature Flags (#2756)

* feat: implemented feature flag

* fix: support deprecated enums

src/core/server/models/tenant/helpers.ts

@@ -1,13 +1,16 @@
 import crypto from "crypto";
 import { FluentBundle } from "fluent/compat";
 
+import { translate } from "coral-server/services/i18n";
+
 import {
+  GQLFEATURE_FLAG,
   GQLReactionConfiguration,
   GQLStaffConfiguration,
 } from "coral-server/graph/tenant/schema/__generated__/types";
-import { translate } from "coral-server/services/i18n";
 
 import { SSOKey } from "../settings";
+import { Tenant } from "./tenant";
 
 export const getDefaultReactionConfiguration = (
   bundle: FluentBundle
@@ -46,3 +49,21 @@ export function generateSSOKey(createdAt: Date): SSOKey {
 
   return { kid, secret, createdAt };
 }
+
+/**
+ * hasFeatureFlag will check to see if the Tenant has a particular feature flag
+ * enabled.
+ *
+ * @param tenant the Tenant to test for a feature flag
+ * @param flag the FEATURE_FLAG to check for
+ */
+export function hasFeatureFlag(
+  tenant: Pick<Tenant, "featureFlags">,
+  flag: GQLFEATURE_FLAG
+) {
+  if (tenant.featureFlags && tenant.featureFlags.includes(flag)) {
+    return true;
+  }
+
+  return false;
+}

src/core/server/models/tenant/tenant.ts

@@ -6,14 +6,16 @@ import { DEFAULT_SESSION_LENGTH } from "coral-common/constants";
 import { LanguageCode } from "coral-common/helpers/i18n/locales";
 import { DeepPartial, Omit, Sub } from "coral-common/types";
 import { dotize } from "coral-common/utils/dotize";
-import {
-  GQLMODERATION_MODE,
-  GQLSettings,
-} from "coral-server/graph/tenant/schema/__generated__/types";
 import { Settings } from "coral-server/models/settings";
 import { I18n } from "coral-server/services/i18n";
 import { tenants as collection } from "coral-server/services/mongodb/collections";
 
+import {
+  GQLFEATURE_FLAG,
+  GQLMODERATION_MODE,
+  GQLSettings,
+} from "coral-server/graph/tenant/schema/__generated__/types";
+
 import {
   generateSSOKey,
   getDefaultReactionConfiguration,
@@ -40,6 +42,11 @@ export interface TenantSettings
    * locale is the specified locale for this Tenant.
    */
   locale: LanguageCode;
+
+  /**
+   * featureFlags is the set of flags enabled on this Tenant.
+   */
+  featureFlags?: GQLFEATURE_FLAG[];
 }
 
 /**
@@ -337,3 +344,51 @@ export async function rotateTenantSSOKey(
 
   return result.value || null;
 }
+
+export async function enableTenantFeatureFlag(
+  mongo: Db,
+  id: string,
+  flag: GQLFEATURE_FLAG
+) {
+  // Update the Tenant.
+  const result = await collection(mongo).findOneAndUpdate(
+    { id },
+    {
+      // Add the flag to the set of enabled flags.
+      $addToSet: {
+        featureFlags: flag,
+      },
+    },
+    {
+      // False to return the updated document instead of the original
+      // document.
+      returnOriginal: false,
+    }
+  );
+
+  return result.value || null;
+}
+
+export async function disableTenantFeatureFlag(
+  mongo: Db,
+  id: string,
+  flag: GQLFEATURE_FLAG
+) {
+  // Update the Tenant.
+  const result = await collection(mongo).findOneAndUpdate(
+    { id },
+    {
+      // Pull the flag from the set of enabled flags.
+      $pull: {
+        featureFlags: flag,
+      },
+    },
+    {
+      // False to return the updated document instead of the original
+      // document.
+      returnOriginal: false,
+    }
+  );
+
+  return result.value || null;
+}