1 files changed, 79 insertions, 0 deletions
diff --git a/packages/server/src/api/util.ts b/packages/server/src/api/util.ts
new file mode 100644
index 0000000..e4a7d17
--- /dev/null
+++ b/packages/server/src/api/util.ts
@@ -0,0 +1,79 @@
+import { Git, GitRequestInfo } from "./git";
+import { readdir } from "fs";
+
+type VerificationResultErrorType = "REPO_NOT_FOUND" | "REPO_INVALID" | "COMMIT_NOT_FOUND" | "COMMIT_INVALID" | "ACCESS_DENIED";
+
+const verification_error_types = {
+	REPO_NOT_FOUND: { code: 404, message: "Repository not found!" },
+	REPO_INVALID: { code: 403, message: "Invalid repository!" },
+	COMMIT_NOT_FOUND: { code: 404, message: "Commit not found!" },
+	COMMIT_INVALID: { code: 403, message: "Invalid commit!" },
+	ACCESS_DENIED: { code: 403, message: "Access denied!" }
+};
+
+export class VerificationResult {
+	constructor(success: boolean, error_type?: VerificationResultErrorType) {
+		this.success = success;
+
+		if(error_type) {
+			this.message = verification_error_types[error_type].message;
+			this.code = verification_error_types[error_type].code;
+		}
+	}
+
+	success: boolean;
+	code: number | null = null;
+	message: string | null = null;
+}
+
+export function verifyRepoName(base_dir: string, repo_name: string) {
+	return new Promise<VerificationResult>(resolve => {
+		console.log(repo_name);
+		const is_valid_repo_name = (/^[a-zA-Z0-9.\-_]+$/u).test(repo_name);
+		if(!is_valid_repo_name) {
+			resolve(new VerificationResult(false, "REPO_INVALID"));
+			return;
+		}
+
+		readdir(base_dir, (err: Error, dir_content: string[]) => {
+			if(err) {
+				resolve(new VerificationResult(false, "REPO_NOT_FOUND"));
+				return;
+			}
+
+			const dir_content_repos = dir_content.filter(repo => repo.endsWith(".git"));
+			if(!dir_content_repos.includes(repo_name + ".git")) {
+				resolve(new VerificationResult(false, "REPO_NOT_FOUND"));
+				return;
+			}
+
+			resolve(new VerificationResult(true));
+		});
+	});
+}
+
+export async function verifyCommitID(git: Git, repo: string, commit_id: string) {
+	if(!(/^[a-fA-F0-9]+$/u).test(commit_id)) {
+		return new VerificationResult(false, "COMMIT_INVALID");
+	}
+
+	const commit_exists = await git.doesCommitExist(repo, commit_id);
+
+	if(!commit_exists) {
+		return new VerificationResult(false, "COMMIT_NOT_FOUND");
+	}
+
+	return new VerificationResult(true);
+}
+
+export function verifyGitRequest(request_info: GitRequestInfo): VerificationResult {
+	if((/\.\/|\.\./u).test(request_info.parsed_url.pathname)) {
+		return new VerificationResult(false, "REPO_NOT_FOUND");
+	}
+
+	if(request_info.service !== "git-upload-pack") {
+		return new VerificationResult(false, "ACCESS_DENIED");
+	}
+
+	return new VerificationResult(true);
+}
+\ No newline at end of file