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429 lines (405 loc) · 10.7 KB
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import {
createTimeout,
jsonResponse,
readLimitedBytes,
} from "./http.js";
const GEOCODE_URL = "https://api.openrouteservice.org/geocode/search";
const DIRECTIONS_BASE_URL =
"https://api.openrouteservice.org/v2/directions";
const ROUTE_PROFILES = new Set([
"foot-walking",
"cycling-regular",
"driving-car",
]);
const TIMEOUT_MS = 8_000;
const GEOCODE_MAX_BYTES = 1_000_000;
const ROUTE_MAX_BYTES = 2_000_000;
const REQUEST_MAX_BYTES = 32_000;
function routeError(code, message, status) {
return jsonResponse(
{ error: { code, message } },
{
status,
headers: { "cache-control": "no-store" },
},
);
}
function serverKey(env) {
if (typeof env?.ORS_API_KEY !== "string") return undefined;
const key = env.ORS_API_KEY.trim();
return key.length > 0 ? key : undefined;
}
function requestKey(request, env) {
const supplied = request.headers
.get("x-sandevistan-ors-key")
?.trim();
if (supplied !== undefined) {
return supplied.length >= 16
&& supplied.length <= 4_096
&& !/[\u0000-\u001f\u007f]/.test(supplied)
? supplied
: undefined;
}
return serverKey(env);
}
export function routingStatus(env) {
return { enabled: serverKey(env) !== undefined };
}
export async function handleRoutingStatus(_request, env) {
return jsonResponse(routingStatus(env), {
headers: { "cache-control": "no-store" },
});
}
function isRecord(value) {
return typeof value === "object" && value !== null && !Array.isArray(value);
}
function isFiniteCoordinate(value) {
return isRecord(value)
&& typeof value.latitude === "number"
&& Number.isFinite(value.latitude)
&& value.latitude >= -90
&& value.latitude <= 90
&& typeof value.longitude === "number"
&& Number.isFinite(value.longitude)
&& value.longitude >= -180
&& value.longitude <= 180;
}
function normalizedText(value) {
if (typeof value !== "string") return undefined;
const normalized = value.replace(/\s+/g, " ").trim();
return normalized.length > 0 ? normalized : undefined;
}
function normalizedGeocodeFeature(feature) {
if (!isRecord(feature) || !isRecord(feature.properties)) return undefined;
const coordinates = feature.geometry?.coordinates;
if (!Array.isArray(coordinates) || coordinates.length < 2) return undefined;
const coordinate = {
latitude: coordinates[1],
longitude: coordinates[0],
};
const identifier = feature.properties.id ?? feature.properties.gid;
const name = normalizedText(feature.properties.name);
const label = normalizedText(feature.properties.label);
if (
(typeof identifier !== "string" && typeof identifier !== "number")
|| !name
|| !label
|| !isFiniteCoordinate(coordinate)
) {
return undefined;
}
return {
id: String(identifier),
name,
label,
coordinate,
};
}
function normalizeGeocodePayload(payload) {
const features = Array.isArray(payload?.features) ? payload.features : [];
return {
results: features
.flatMap((feature) => {
const normalized = normalizedGeocodeFeature(feature);
return normalized ? [normalized] : [];
})
.slice(0, 5),
};
}
export async function handleGeocodeRequest(
request,
env,
{
fetchImpl = fetch,
setTimeoutImpl = setTimeout,
clearTimeoutImpl = clearTimeout,
} = {},
) {
const key = requestKey(request, env);
if (!key) {
return routeError(
"ROUTING_DISABLED",
"Routing is not configured",
503,
);
}
const query = new URL(request.url).searchParams.get("q")?.trim() ?? "";
const queryLength = [...query].length;
if (queryLength < 2 || queryLength > 80) {
return routeError(
"INVALID_QUERY",
"Destination query must contain 2 to 80 characters",
400,
);
}
const upstreamUrl = new URL(GEOCODE_URL);
upstreamUrl.searchParams.set("api_key", key);
upstreamUrl.searchParams.set("text", query);
upstreamUrl.searchParams.set("boundary.country", "KR");
upstreamUrl.searchParams.set("size", "5");
const timeout = createTimeout(
TIMEOUT_MS,
setTimeoutImpl,
clearTimeoutImpl,
);
try {
const upstream = await fetchImpl(upstreamUrl, {
redirect: "error",
headers: { accept: "application/json" },
signal: timeout.signal,
});
if (!upstream.ok) {
return routeError(
"GEOCODE_UPSTREAM_ERROR",
"Destination search failed",
502,
);
}
const bytes = await readLimitedBytes(upstream, GEOCODE_MAX_BYTES);
const payload = JSON.parse(new TextDecoder().decode(bytes));
return jsonResponse(normalizeGeocodePayload(payload), {
headers: { "cache-control": "no-store" },
});
} catch {
return routeError(
"GEOCODE_UPSTREAM_ERROR",
"Destination search failed",
502,
);
} finally {
timeout.dispose();
}
}
export async function handleRoutingKeyTest(
request,
env,
{
fetchImpl = fetch,
setTimeoutImpl = setTimeout,
clearTimeoutImpl = clearTimeout,
} = {},
) {
const key = requestKey(request, env);
if (!key) {
return routeError(
"INVALID_ROUTING_KEY",
"Routing key is invalid",
400,
);
}
const upstreamUrl = new URL(GEOCODE_URL);
upstreamUrl.searchParams.set("api_key", key);
upstreamUrl.searchParams.set("text", "Seoul");
upstreamUrl.searchParams.set("size", "1");
const timeout = createTimeout(
TIMEOUT_MS,
setTimeoutImpl,
clearTimeoutImpl,
);
try {
const upstream = await fetchImpl(upstreamUrl, {
redirect: "error",
headers: { accept: "application/json" },
signal: timeout.signal,
});
return upstream.ok
? jsonResponse(
{ valid: true },
{ headers: { "cache-control": "no-store" } },
)
: routeError(
"INVALID_ROUTING_KEY",
"Routing key validation failed",
401,
);
} catch {
return routeError(
timeout.signal.aborted
? "ROUTING_KEY_TIMEOUT"
: "ROUTING_KEY_UPSTREAM_ERROR",
"Routing key validation failed",
timeout.signal.aborted ? 504 : 502,
);
} finally {
timeout.dispose();
}
}
async function readRouteRequest(request) {
try {
const bytes = await readLimitedBytes(
new Response(request.body),
REQUEST_MAX_BYTES,
);
const payload = JSON.parse(new TextDecoder().decode(bytes));
return isRecord(payload) ? payload : undefined;
} catch {
return undefined;
}
}
function finiteNonNegative(value) {
return typeof value === "number" && Number.isFinite(value) && value >= 0;
}
function normalizeRoutePayload(payload) {
const feature = payload?.features?.[0];
const coordinates = feature?.geometry?.coordinates;
const summary = feature?.properties?.summary;
const steps = feature?.properties?.segments?.[0]?.steps;
if (
feature?.geometry?.type !== "LineString"
|| !Array.isArray(coordinates)
|| coordinates.length < 2
|| !isRecord(summary)
|| !finiteNonNegative(summary.distance)
|| !finiteNonNegative(summary.duration)
|| !Array.isArray(steps)
) {
return undefined;
}
const geometry = coordinates.map((point) => {
if (!Array.isArray(point) || point.length < 2) return undefined;
const coordinate = {
latitude: point[1],
longitude: point[0],
};
return isFiniteCoordinate(coordinate)
? [coordinate.latitude, coordinate.longitude]
: undefined;
});
if (geometry.some((point) => point === undefined)) return undefined;
const maneuvers = steps.map((step) => {
const instruction = normalizedText(step?.instruction);
const wayPoints = step?.way_points;
if (
!instruction
|| !finiteNonNegative(step?.distance)
|| !Array.isArray(wayPoints)
|| wayPoints.length !== 2
|| !wayPoints.every(
(point) =>
Number.isInteger(point)
&& point >= 0
&& point < geometry.length,
)
|| wayPoints[0] > wayPoints[1]
) {
return undefined;
}
return {
instruction,
distance: step.distance,
wayPoints: [wayPoints[0], wayPoints[1]],
};
});
if (maneuvers.some((maneuver) => maneuver === undefined)) return undefined;
return {
geometry,
distance: summary.distance,
duration: summary.duration,
maneuvers,
};
}
export async function handleRouteRequest(
request,
env,
{
fetchImpl = fetch,
setTimeoutImpl = setTimeout,
clearTimeoutImpl = clearTimeout,
} = {},
) {
const key = requestKey(request, env);
if (!key) {
return routeError(
"ROUTING_DISABLED",
"Routing is not configured",
503,
);
}
const payload = await readRouteRequest(request);
if (!payload) {
return routeError("INVALID_JSON", "Route request JSON is invalid", 400);
}
if (!ROUTE_PROFILES.has(payload.profile)) {
return routeError(
"INVALID_PROFILE",
"Route profile is not supported",
400,
);
}
if (
!isFiniteCoordinate(payload.start)
|| !isFiniteCoordinate(payload.destination)
) {
return routeError(
"INVALID_COORDINATE",
"Route coordinate is invalid",
400,
);
}
const timeout = createTimeout(
TIMEOUT_MS,
setTimeoutImpl,
clearTimeoutImpl,
);
try {
const upstream = await fetchImpl(
`${DIRECTIONS_BASE_URL}/${payload.profile}/geojson`,
{
method: "POST",
headers: {
authorization: key,
"content-type": "application/json",
accept: "application/geo+json",
},
body: JSON.stringify({
coordinates: [
[payload.start.longitude, payload.start.latitude],
[payload.destination.longitude, payload.destination.latitude],
],
instructions: true,
language: "en",
}),
redirect: "error",
signal: timeout.signal,
},
);
if (!upstream.ok) {
return routeError(
"ROUTE_UPSTREAM_ERROR",
"Route request failed",
502,
);
}
const bytes = await readLimitedBytes(upstream, ROUTE_MAX_BYTES);
const normalized = normalizeRoutePayload(
JSON.parse(new TextDecoder().decode(bytes)),
);
return normalized
? jsonResponse(normalized, {
headers: { "cache-control": "no-store" },
})
: routeError(
"ROUTE_UPSTREAM_ERROR",
"Route request failed",
502,
);
} catch (error) {
if (timeout.signal.aborted || error?.name === "AbortError") {
return routeError("ROUTE_TIMEOUT", "Route request timed out", 504);
}
if (error instanceof Error && error.message === "RESPONSE_TOO_LARGE") {
return routeError(
"ROUTE_TOO_LARGE",
"Route response is too large",
502,
);
}
return routeError(
"ROUTE_UPSTREAM_ERROR",
"Route request failed",
502,
);
} finally {
timeout.dispose();
}
}