Band MCP Server

const COMMENT_PARAM_KEYS = ["commentId", "comment_id", "commentKey", "comment_key"] as const; export interface ParsedBandUrl { bandKey: string; postKey?: string; commentKey?: string; } export class BandUrlParseError extends Error { constructor(message: string) { super(message); this.name = "BandUrlParseError"; } } function normalize(value: string | null): string | undefined { if (!value) return undefined; const trimmed = value.trim(); return trimmed.length > 0 ? trimmed : undefined; } export function parseBandUrl(rawUrl: string): ParsedBandUrl { let url: URL; try { url = new URL(rawUrl); } catch (error) { throw new BandUrlParseError(`Invalid URL: ${(error as Error).message}`); } const hostname = url.hostname.toLowerCase(); if (!hostname.endsWith("band.us")) { throw new BandUrlParseError("URL must belong to band.us"); } const segments = url.pathname.split("/").filter(Boolean); if (segments.length < 2 || segments[0] !== "band") { throw new BandUrlParseError("Unsupported BAND URL format: missing band key"); } const bandKey = segments[1]; if (!bandKey) { throw new BandUrlParseError("Band key was not found in the URL"); } let postKey: string | undefined; if (segments.length >= 4 && segments[2] === "post") { postKey = segments[3]; } let commentKey: string | undefined; for (const key of COMMENT_PARAM_KEYS) { const candidate = normalize(url.searchParams.get(key)); if (candidate) { commentKey = candidate; break; } } const result: ParsedBandUrl = { bandKey }; if (postKey) { result.postKey = postKey; } if (commentKey) { result.commentKey = commentKey; } return result; }