fix(striker-ui-api): add delete user request handler

striker-ui-api/src/lib/consts/DELETED.ts

@@ -0,0 +1 @@
+export const DELETED = 'DELETED';

striker-ui-api/src/lib/consts/index.ts

@@ -3,6 +3,8 @@ import SERVER_PATHS from './SERVER_PATHS';
 export { SERVER_PATHS };
 
 export * from './AN_VARIABLE_NAME_LIST';
+export * from './DELETED';
 export * from './EXIT_CODE_LIST';
 export * from './PROCESS_OWNER';
+export * from './REG_EXP_PATTERNS';
 export * from './SERVER_PORT';

striker-ui-api/src/lib/request_handlers/user/deleteUser.ts

@@ -0,0 +1,69 @@
+import assert from 'assert';
+import { RequestHandler } from 'express';
+
+import { DELETED, REP_UUID } from '../../consts';
+
+import { awrite } from '../../accessModule';
+import join from '../../join';
+import { sanitize } from '../../sanitize';
+import { stderr, stdoutVar } from '../../shell';
+
+export const deleteUser: RequestHandler<
+  DeleteUserParamsDictionary,
+  undefined,
+  DeleteUserRequestBody
+> = (request, response) => {
+  const {
+    body: { uuids: rawUserUuidList } = {},
+    params: { userUuid },
+  } = request;
+
+  const userUuidList = sanitize(rawUserUuidList, 'string[]');
+
+  const ulist = userUuidList.length > 0 ? userUuidList : [userUuid];
+
+  stdoutVar({ ulist });
+
+  try {
+    let failedIndex = 0;
+
+    assert(
+      ulist.every((uuid, index) => {
+        failedIndex = index;
+
+        return REP_UUID.test(uuid);
+      }),
+      `All UUIDs must be valid UUIDv4; failed at ${failedIndex}, got [${ulist[failedIndex]}]`,
+    );
+  } catch (assertError) {
+    stderr(`Failed to assert value during delete user; CAUSE: ${assertError}`);
+
+    return response.status(400).send();
+  }
+
+  try {
+    awrite(
+      `UPDATE users
+        SET user_algorithm = '${DELETED}'
+        WHERE user_uuid IN (${join(ulist)});`,
+      {
+        onClose: ({ ecode, wcode }) => {
+          if (ecode !== 0 || wcode !== 0) {
+            stderr(
+              `SQL script failed in delete user(s); ecode=${ecode}, wcode=${wcode}`,
+            );
+          }
+        },
+        onError: (error) => {
+          stderr(`Delete user subprocess error; CAUSE: ${error}`);
+        },
+      },
+    );
+  } catch (error) {
+    stderr(`Failed to delete user(s); CAUSE: ${error}`);
+
+    return response.status(500).send();
+  }
+
+  response.status(204).send();
+};

striker-ui-api/src/lib/request_handlers/user/index.ts

@@ -1 +1,2 @@
+export * from './deleteUser';
 export * from './getUser';

striker-ui-api/src/routes/user.ts

@@ -1,9 +1,12 @@
 import express from 'express';
 
-import { getUser } from '../lib/request_handlers/user';
+import { deleteUser, getUser } from '../lib/request_handlers/user';
 
 const router = express.Router();
 
-router.get('/', getUser);
+router
+  .get('/', getUser)
+  .delete('/', deleteUser)
+  .delete('/:userUuid', deleteUser);
 
 export default router;