Move Group mutations to entities

app/soapbox/hooks/api/groups/useCancelMembershipRequest.ts

@@ -0,0 +1,21 @@
+import { Entities } from 'soapbox/entity-store/entities';
+import { useEntityActions } from 'soapbox/entity-store/hooks';
+import { useOwnAccount } from 'soapbox/hooks';
+
+import type { Group, GroupRelationship } from 'soapbox/schemas';
+
+function useCancelMembershipRequest(group: Group) {
+  const me = useOwnAccount();
+
+  const { createEntity, isLoading } = useEntityActions<GroupRelationship>(
+    [Entities.GROUP_RELATIONSHIPS, group.id],
+    { post: `/api/v1/groups/${group.id}/membership_requests/${me?.id}/reject` },
+  );
+
+  return {
+    mutate: createEntity,
+    isLoading,
+  };
+}
+
+export { useCancelMembershipRequest };

app/soapbox/hooks/api/groups/useJoinGroup.ts

@@ -0,0 +1,20 @@
+import { Entities } from 'soapbox/entity-store/entities';
+import { useEntityActions } from 'soapbox/entity-store/hooks';
+import { groupRelationshipSchema } from 'soapbox/schemas';
+
+import type { Group, GroupRelationship } from 'soapbox/schemas';
+
+function useJoinGroup(group: Group) {
+  const { createEntity, isLoading } = useEntityActions<GroupRelationship>(
+    [Entities.GROUP_RELATIONSHIPS, group.id],
+    { post: `/api/v1/groups/${group.id}/join` },
+    { schema: groupRelationshipSchema },
+  );
+
+  return {
+    mutate: createEntity,
+    isLoading,
+  };
+}
+
+export { useJoinGroup };

app/soapbox/hooks/api/groups/useLeaveGroup.ts

@@ -0,0 +1,18 @@
+import { Entities } from 'soapbox/entity-store/entities';
+import { useEntityActions } from 'soapbox/entity-store/hooks';
+import { Group, GroupRelationship, groupRelationshipSchema } from 'soapbox/schemas';
+
+function useLeaveGroup(group: Group) {
+  const { createEntity, isLoading } = useEntityActions<GroupRelationship>(
+    [Entities.GROUP_RELATIONSHIPS, group.id],
+    { post: `/api/v1/groups/${group.id}/leave` },
+    { schema: groupRelationshipSchema },
+  );
+
+  return {
+    mutate: createEntity,
+    isLoading,
+  };
+}
+
+export { useLeaveGroup };