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feat: enable encodedpath in query to load encoded polyline

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Signed-off-by: Vinayak Kulkarni <19776877+vinayakkulkarni@users.noreply.github.com>
This commit is contained in:
Vinayak Kulkarni 2022-11-25 00:28:44 +05:30
parent 96a3614fd6
commit a1f60e16b5
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GPG key ID: B8C8194CED989C08
1 changed files with 43 additions and 30 deletions
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73
src/serve_rendered.js
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@ -15,6 +15,7 @@ import sanitize from 'sanitize-filename';
import SphericalMercator from '@mapbox/sphericalmercator';
import mlgl from '@maplibre/maplibre-gl-native';
import MBTiles from '@mapbox/mbtiles';
import polyline from '@mapbox/polyline';
import proj4 from 'proj4';
import request from 'request';
import { getFontsPbf, getTileUrls, fixTileJSONCenter } from './utils.js';
@ -147,47 +148,59 @@ const parseCoordinates = (coordinatePair, query, transformer) => {
* @param {Function} transformer Optional transform function.
*/
const extractPathsFromQuery = (query, transformer) => {
// Return an empty list if no paths have been provided
if (!query.path) {
return [];
}
const paths = [];
// Return an empty list if no paths have been provided
if (
('path' in query && !query.path) ||
('encodedpath' in query && !query.encodedpath)
) {
return paths;
}
// Parse paths provided via path query argument
if ('path' in query) {
// Check if multiple paths have been provided and mimic a list if it's a
// single path.
const providedPaths = Array.isArray(query.path) ? query.path : [query.path];
// Check if multiple paths have been provided and mimic a list if it's a
// single path.
const providedPaths = Array.isArray(query.path) ? query.path : [query.path];
// Iterate through paths, parse and validate them
for (const providedPath of providedPaths) {
const currentPath = [];
// Iterate through paths, parse and validate them
for (const provided_path of providedPaths) {
const currentPath = [];
// Extract coordinate-list from path
const pathParts = (providedPath || '').split('|');
// Extract coordinate-list from path
const pathParts = (provided_path || '').split('|');
// Iterate through coordinate-list, parse the coordinates and validate them
for (const pair of pathParts) {
// Extract coordinates from coordinate pair
const pairParts = pair.split(',');
// Iterate through coordinate-list, parse the coordinates and validate them
for (const pair of pathParts) {
// Extract coordinates from coordinate pair
const pairParts = pair.split(',');
// Ensure we have two coordinates
if (pairParts.length === 2) {
const pair = parseCoordinates(pairParts, query, transformer);
// Ensure we have two coordinates
if (pairParts.length === 2) {
const pair = parseCoordinates(pairParts, query, transformer);
// Ensure coordinates could be parsed and skip them if not
if (pair === null) {
continue;
}
// Ensure coordinates could be parsed and skip them if not
if (pair === null) {
continue;
// Add the coordinate-pair to the current path if they are valid
currentPath.push(pair);
}
}
// Add the coordinate-pair to the current path if they are valid
currentPath.push(pair);
// Extend list of paths with current path if it contains coordinates
if (currentPath.length) {
paths.push(currentPath);
}
}
// Extend list of paths with current path if it contains coordinates
if (currentPath.length) {
paths.push(currentPath);
}
}
// Check if encoded paths have been provided
if ('encodedpath' in query) {
// silly lat/lng switch 🤷‍♂️
const coords = polyline
.decode(query.encodedpath)
.map(([lat, lng]) => [lng, lat]);
paths.push(coords);
}
return paths;
};