From a13786d6cc185822f5940582efde2349ef729145 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Thu, 24 Jun 2021 22:50:38 +0200
Subject: Refactored the backend yet again

---
 packages/server/src/git/http.ts | 84 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 packages/server/src/git/http.ts

(limited to 'packages/server/src/git/http.ts')

diff --git a/packages/server/src/git/http.ts b/packages/server/src/git/http.ts
new file mode 100644
index 0000000..2d707cb
--- /dev/null
+++ b/packages/server/src/git/http.ts
@@ -0,0 +1,84 @@
+import { FastifyReply, FastifyRequest } from "fastify";
+import { IncomingMessage } from "http";
+import { Repository } from "./repository";
+import { Route } from "../fastify_types";
+import { join } from "path";
+import { spawn } from "child_process";
+import { verifyGitRequest } from "../api/util";
+
+export type RequestInfo = {
+	repo: string,
+	url_path: string,
+	parsed_url: URL,
+	url_path_parts: string[],
+	is_discovery: boolean,
+	service: string | null,
+	content_type: string
+}
+
+export interface Request extends FastifyRequest {
+	params: Route["Params"],
+}
+
+function getRequestInfo(req: Request): RequestInfo {
+	const repo = req.params.repo + ".git";
+	const url_path = req.url.replace(req.params.repo, repo);
+
+	const parsed_url = new URL(`${req.protocol}://${req.hostname}${url_path}`);
+	const url_path_parts = parsed_url.pathname.split("/");
+
+	const is_discovery = (/\/info\/refs$/u).test(parsed_url.pathname);
+
+	const service = is_discovery ? parsed_url.searchParams.get("service") : url_path_parts[url_path_parts.length - 1];
+
+	const content_type = `application/x-${service}-${is_discovery ? "advertisement" : "result"}`;
+
+	return {
+		repo,
+		url_path,
+		parsed_url,
+		is_discovery,
+		url_path_parts,
+		service,
+		content_type
+	};
+}
+
+export function connect(repository: Repository, req: Request, reply: FastifyReply): void {
+	const request_info = getRequestInfo(req);
+
+	const valid_request = verifyGitRequest(request_info);
+	if(valid_request.success === false && valid_request.code) {
+		reply.header("Content-Type", request_info.content_type);
+		reply.code(valid_request.code).send(valid_request.message);
+		return;
+	}
+
+	reply.raw.writeHead(200, { "Content-Type": request_info.content_type });
+
+	const spawn_args = [ "--stateless-rpc", join(repository.base_dir, request_info.repo) ];
+	if(request_info.is_discovery) {
+		spawn_args.push("--advertise-refs");
+	}
+
+	const git_pack = spawn(<string>request_info.service, spawn_args);
+
+	if(request_info.is_discovery) {
+		const s = "# service=" + request_info.service + "\n";
+		const n = (4 + s.length).toString(16);
+		reply.raw.write(Buffer.from((Array(4 - n.length + 1).join("0") + n + s) + "0000"));
+	}
+	else {
+		const request_body: IncomingMessage = req.raw;
+
+		request_body.on("data", data => git_pack.stdin.write(data));
+		request_body.on("close", () => git_pack.stdin.end());
+	}
+
+	git_pack.on("error", err => console.log(err));
+
+	git_pack.stderr.on("data", (stderr: Buffer) => console.log(stderr.toString()));
+	git_pack.stdout.on("data", data => reply.raw.write(data));
+
+	git_pack.on("close", () => reply.raw.end());
+}
\ No newline at end of file
-- 
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