Function parseGithubUsernameFromInput

server/ai.ts:19–57

(input: string)

const GITHUB_USERNAME_REGEX = /^[A-Za-z0-9](?:[A-Za-z0-9-]{0,37}[A-Za-z0-9])?$/;

function parseGithubUsernameFromInput(input: string): string {
  const trimmed = input.trim();

  // Check if it's a URL
  if (trimmed.includes("://")) {
    let url: URL;
    try {
      url = new URL(trimmed);
    } catch {
      throw new Error("Invalid GitHub profile URL");
    }

    if (!GITHUB_HOSTS.has(url.hostname)) {
      throw new Error("Invalid GitHub profile URL (must be github.com)");
    }

    const segments = url.pathname.split("/").filter(Boolean);
    // Only allow `https://github.com/<username>` (optional trailing slash is fine)
    if (segments.length !== 1) {
      throw new Error(
        "Invalid GitHub profile URL (must be a profile URL like https://github.com/username)"
      );
    }

    const username = decodeURIComponent(segments[0] ?? "").trim();
    if (!username || !GITHUB_USERNAME_REGEX.test(username)) {
      throw new Error("Invalid GitHub username");
    }

    return username.toLowerCase();
  }

  // Otherwise treat as a username
  if (!trimmed || !GITHUB_USERNAME_REGEX.test(trimmed)) {
    throw new Error("Invalid GitHub username");
  }

  return trimmed.toLowerCase();
}

export async function fetchGithubStats(username: string) {
  const query = `