organicmaps/url-processor
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Support clear text coordinates in the url

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For example, these formats are supported:
https://omaps.app/12.345,-2.654
https://omaps.app/12.345/-2.654/18
https://omaps.app/-12.345_2.654_Some%20Name
https://omaps.app/12.345,-2.654,14,Some_Name

Note that any other delimiter can be used instead of a comma, excluding digit, '.', '#' and '?'

Signed-off-by: Alexander Borsuk <me@alex.bio>
This commit is contained in:
Alexander Borsuk 2023-05-04 23:33:41 +02:00 • committed by Alexander Borsuk
parent dae5a15132
commit c303211d94
1 changed files with 42 additions and 9 deletions
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51
src/ge0.ts
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@ -9,14 +9,7 @@ function replaceInTemplate(template: string, data: Record<string, any>) {
return template.replace(pattern, (_, token) => data[token] || '');
}
// Throws on decode error.
export async function onGe0Decode(template: string, url: string): Promise<Response> {
const { pathname, search, hash } = new URL(url);
// Filter empty pathname elements.
const params = pathname.split('/').filter(Boolean);
const encodedLatLonZoom = params[0];
let name = params.length > 1 ? params[1] : undefined;
const llz = decodeLatLonZoom(encodedLatLonZoom);
function normalizeNameAndTitle(name: string | undefined): [string, string] {
let title = 'Organic Maps';
if (name) {
name = decodeURIComponent(name.replace(/\+|_/g, ' '));
@ -25,6 +18,46 @@ export async function onGe0Decode(template: string, url: string): Promise<Respon
} else {
name = 'Shared via <a href="https://organicmaps.app">Organic Maps</a>';
}
return [name, title];
}
function normalizeZoom(zoom: string): number {
const DEFAULT_ZOOM = 14;
const z = parseInt(zoom);
if (isNaN(z)) return DEFAULT_ZOOM;
if (z < 1 || z > 19) return DEFAULT_ZOOM;
return z;
}
// Coordinates and zoom are validated separately.
const CLEAR_COORDINATES_REGEX =
/(?<lat>-?\d+\.\d+)[^\d.](?<lon>-?\d+\.\d+)(?:[^\d.](?<zoom>\d{1,2}))?(?:[^\d.](?<name>.+))?/;
// Throws on decode error.
export async function onGe0Decode(template: string, url: string): Promise<Response> {
const { pathname, search, hash } = new URL(url);
const m = pathname.match(CLEAR_COORDINATES_REGEX);
if (m && m.groups) {
const llz = { lat: Number(m.groups.lat), lon: Number(m.groups.lon), zoom: normalizeZoom(m.groups.zoom) };
if (llz.lat <= -90.0 || llz.lat >= 90.0 || llz.lon <= -180.0 || llz.lon >= 180.0)
throw new Error(`Invalid coordinates ${m.groups.lat} and ${m.groups.lon}`);
const [name, title] = normalizeNameAndTitle(m.groups.name);
template = replaceInTemplate(template, {
...llz,
title,
name,
path: pathname + search + hash, // Starts with a slash
});
return new Response(template, { headers: { 'content-type': 'text/html' } });
}
// Filter empty pathname elements.
const params = pathname.split('/').filter(Boolean);
const encodedLatLonZoom = params[0];
const llz = decodeLatLonZoom(encodedLatLonZoom);
const [name, title] = normalizeNameAndTitle(params.length > 1 ? params[1] : undefined);
template = replaceInTemplate(template, {
...llz,
@ -69,7 +102,7 @@ function decodeLatLonZoom(encodedLatLonZoom: string): LatLonZoom {
lon = Math.round(lon * 1e5) / 1e5;
if (lat <= -90.0 || lat >= 90.0 || lon <= -180.0 || lon >= 180.0)
throw new Error('Invalid coordinates: the url was not encoded properly');
throw new Error(`Invalid coordinates ${encodedLatLonZoom}, the url was not encoded properly`);
return { lat, lon, zoom };
}