[CORL-824] Feature Flags (#2756)

* feat: implemented feature flag

* fix: support deprecated enums

src/core/server/graph/tenant/mutators/Settings.ts

@@ -1,7 +1,16 @@
 import TenantContext from "coral-server/graph/tenant/context";
-import { GQLUpdateSettingsInput } from "coral-server/graph/tenant/schema/__generated__/types";
 import { Tenant } from "coral-server/models/tenant";
-import { regenerateSSOKey, update } from "coral-server/services/tenant";
+import {
+  disableFeatureFlag,
+  enableFeatureFlag,
+  regenerateSSOKey,
+  update,
+} from "coral-server/services/tenant";
+
+import {
+  GQLFEATURE_FLAG,
+  GQLUpdateSettingsInput,
+} from "coral-server/graph/tenant/schema/__generated__/types";
 
 export const Settings = ({
   mongo,
@@ -15,4 +24,8 @@ export const Settings = ({
     update(mongo, redis, tenantCache, config, tenant, input.settings),
   regenerateSSOKey: (): Promise<Tenant | null> =>
     regenerateSSOKey(mongo, redis, tenantCache, tenant, now),
+  enableFeatureFlag: (flag: GQLFEATURE_FLAG) =>
+    enableFeatureFlag(mongo, redis, tenantCache, tenant, flag),
+  disableFeatureFlag: (flag: GQLFEATURE_FLAG) =>
+    disableFeatureFlag(mongo, redis, tenantCache, tenant, flag),
 });

src/core/server/graph/tenant/resolvers/Mutation.ts

@@ -229,4 +229,12 @@ export const Mutation: Required<GQLMutationTypeResolver<void>> = {
     user: await ctx.mutators.Users.deleteModeratorNote(input),
     clientMutationId: input.clientMutationId,
   }),
+  enableFeatureFlag: async (source, { input }, ctx) => ({
+    flags: await ctx.mutators.Settings.enableFeatureFlag(input.flag),
+    clientMutationId: input.clientMutationId,
+  }),
+  disableFeatureFlag: async (source, { input }, ctx) => ({
+    flags: await ctx.mutators.Settings.disableFeatureFlag(input.flag),
+    clientMutationId: input.clientMutationId,
+  }),
 };

src/core/server/graph/tenant/resolvers/Settings.ts

@@ -1,6 +1,21 @@
-import { GQLSettingsTypeResolver } from "coral-server/graph/tenant/schema/__generated__/types";
 import { Tenant } from "coral-server/models/tenant";
 
+import {
+  GQLFEATURE_FLAG,
+  GQLSettingsTypeResolver,
+} from "coral-server/graph/tenant/schema/__generated__/types";
+
+const filterValidFeatureFlags = () => {
+  // Compute the valid flags based on this enum.
+  const flags = Object.values(GQLFEATURE_FLAG);
+
+  // Return a type guard for the feature flag.
+  return (flag: string | GQLFEATURE_FLAG): flag is GQLFEATURE_FLAG =>
+    flags.includes(flag);
+};
+
 export const Settings: GQLSettingsTypeResolver<Tenant> = {
   slack: ({ slack = {} }) => slack,
+  featureFlags: ({ featureFlags = [] }) =>
+    featureFlags.filter(filterValidFeatureFlags()),
 };

src/core/server/graph/tenant/schema/schema.graphql

@@ -333,6 +333,14 @@ type ActionPresence {
 ## Settings
 ################################################################################
 
+enum FEATURE_FLAG {
+  """
+  DISABLE_WARN_USER_OF_TOXIC_COMMENT when enabled will turn off warnings for
+  toxic comments.
+  """
+  DISABLE_WARN_USER_OF_TOXIC_COMMENT
+}
+
 # The moderation mode of the site.
 enum MODERATION_MODE {
   """
@@ -967,7 +975,6 @@ type SlackChannelTriggers {
   featuredComments is whether this channel will receive featured comments
   """
   featuredComments: Boolean!
-
 }
 
 type SlackChannel {
@@ -1323,6 +1330,11 @@ type Settings {
   """
   stories: StoryConfiguration! @auth(roles: [ADMIN])
 
+  """
+  featureFlags provides the enabled feature flags.
+  """
+  featureFlags: [FEATURE_FLAG!]! @auth(roles: [ADMIN])
+
   """
   createdAt is the time that the Settings was created at.
   """
@@ -3480,7 +3492,6 @@ input SlackTriggersConfigurationInput {
   featuredComments is whether this channel will receive featured comments
   """
   featuredComments: Boolean
-
 }
 
 input SlackChannelConfigurationInput {
@@ -5247,6 +5258,62 @@ type RequestUserCommentsDownloadPayload {
   archiveURL: String!
 }
 
+#########################
+# enableFeatureFlag
+#########################
+
+input EnableFeatureFlagInput {
+  """
+  clientMutationId is required for Relay support.
+  """
+  clientMutationId: String!
+
+  """
+  flag is the feature flag to create.
+  """
+  flag: FEATURE_FLAG!
+}
+
+type EnableFeatureFlagPayload {
+  """
+  clientMutationId is required for Relay support.
+  """
+  clientMutationId: String!
+
+  """
+  flags is the current set of flags enabled.
+  """
+  flags: [FEATURE_FLAG!]!
+}
+
+#########################
+# disableFeatureFlag
+#########################
+
+input DisableFeatureFlagInput {
+  """
+  clientMutationId is required for Relay support.
+  """
+  clientMutationId: String!
+
+  """
+  flag is the feature flag to delete.
+  """
+  flag: FEATURE_FLAG!
+}
+
+type DisableFeatureFlagPayload {
+  """
+  clientMutationId is required for Relay support.
+  """
+  clientMutationId: String!
+
+  """
+  flags is the current set of flags enabled.
+  """
+  flags: [FEATURE_FLAG!]!
+}
+
 ##################
 ## Mutation
 ##################
@@ -5605,6 +5672,19 @@ type Mutation {
   deleteModeratorNote(
     input: DeleteModeratorNoteInput!
   ): DeleteModeratorNotePayload! @auth(roles: [ADMIN, MODERATOR])
+
+  """
+  enableFeatureFlag will enable a given FEATURE_FLAG.
+  """
+  enableFeatureFlag(input: EnableFeatureFlagInput!): EnableFeatureFlagPayload!
+    @auth(roles: [ADMIN])
+
+  """
+  disableFeatureFlag will disable a given FEATURE_FLAG
+  """
+  disableFeatureFlag(
+    input: DisableFeatureFlagInput!
+  ): DisableFeatureFlagPayload! @auth(roles: [ADMIN])
 }
 
 ##################