60 lines
1.8 KiB
TypeScript
60 lines
1.8 KiB
TypeScript
type HostSource = string | null | undefined;
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type CanvasHostUrlParams = {
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canvasPort?: number;
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hostOverride?: HostSource;
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requestHost?: HostSource;
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forwardedProto?: HostSource | HostSource[];
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localAddress?: HostSource;
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scheme?: "http" | "https";
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};
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const isLoopbackHost = (value: string) => {
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const normalized = value.trim().toLowerCase();
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if (!normalized) return false;
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if (normalized === "localhost") return true;
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if (normalized === "::1") return true;
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if (normalized === "0.0.0.0" || normalized === "::") return true;
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return normalized.startsWith("127.");
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};
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const normalizeHost = (value: HostSource, rejectLoopback: boolean) => {
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if (!value) return "";
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const trimmed = value.trim();
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if (!trimmed) return "";
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if (rejectLoopback && isLoopbackHost(trimmed)) return "";
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return trimmed;
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};
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const parseHostHeader = (value: HostSource) => {
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if (!value) return "";
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try {
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return new URL(`http://${String(value).trim()}`).hostname;
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} catch {
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return "";
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}
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};
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const parseForwardedProto = (value: HostSource | HostSource[]) => {
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if (Array.isArray(value)) return value[0];
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return value;
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};
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export function resolveCanvasHostUrl(params: CanvasHostUrlParams) {
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const port = params.canvasPort;
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if (!port) return undefined;
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const scheme =
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params.scheme ??
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(parseForwardedProto(params.forwardedProto)?.trim() === "https" ? "https" : "http");
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const override = normalizeHost(params.hostOverride, true);
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const requestHost = normalizeHost(parseHostHeader(params.requestHost), !!override);
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const localAddress = normalizeHost(params.localAddress, Boolean(override || requestHost));
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const host = override || requestHost || localAddress;
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if (!host) return undefined;
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const formatted = host.includes(":") ? `[${host}]` : host;
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return `${scheme}://${formatted}:${port}`;
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}
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