Add /version endpoint (#15)

* Add `/version` endpoint

Provide API version and commit hash.

* Update README for new endpoint

README.md

@@ -15,6 +15,7 @@
 | GET <br>`text/plain` | `/health` | Performs health checks and checks if the database is accessible |
 | GET <br>`text/plain` | `/metrics` | [Prometheus](https://prometheus.io/) metrics |
 | GET <br>`application/json` | `/openapi` | [OpenAPI](https://www.openapis.org/) specification |
+| GET <br>`application/json` | `/version` | API version and commit hash |
 
 ## Requirements
 

src/fetch/GET.ts

@@ -8,6 +8,8 @@ import { logger } from "../logger.js";
 import swaggerHtml from "../../swagger/index.html"
 import swaggerFavicon from "../../swagger/favicon.png"
 import transfers from "./transfers.js";
+import { toJSON } from "./utils.js";
+import { APP_VERSION } from "../config.js";
 
 export default async function (req: Request) {
     const { pathname } = new URL(req.url);
@@ -21,6 +23,7 @@ export default async function (req: Request) {
     if (pathname === "/health") return health(req);
     if (pathname === "/metrics") return new Response(await registry.metrics(), { headers: { "Content-Type": registry.contentType } });
     if (pathname === "/openapi") return new Response(openapi, { headers: { "Content-Type": "application/json" } });
+    if (pathname === "/version") return toJSON({ version: APP_VERSION.split('+')[0], commit: APP_VERSION.split('+')[1] });
 
     // Token endpoints
     if (pathname === "/supply") return supply(req);

src/fetch/openapi.ts

@@ -174,7 +174,14 @@ export default new OpenApiBuilder()
         get: {
             tags: [TAGS.DOCS],
             summary: "OpenAPI JSON specification",
-            responses: { 200: { description: "OpenAPI JSON specification", content: { "application/json": { schema: { type: "string" } } } } },
+            responses: { 200: { description: "OpenAPI JSON specification", content: { "application/json": {} } } },
+        },
+    })
+    .addPath("/version", {
+        get: {
+            tags: [TAGS.DOCS],
+            summary: "API version",
+            responses: { 200: { description: "API version and commit hash", content: { "application/json": {} } } },
         },
     })
     .getSpecAsJson();