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// Start with longitude\n \n while (geohash.length < precision) {\n if (even) {\n // Longitude\n const mid = (lngMin + lngMax) / 2;\n if (lng >= mid) {\n bit = (bit << 1) | 1;\n lngMin = mid;\n } else {\n bit = bit << 1;\n lngMax = mid;\n }\n } else {\n // Latitude\n const mid = (latMin + latMax) / 2;\n if (lat >= mid) {\n bit = (bit << 1) | 1;\n latMin = mid;\n } else {\n bit = bit << 1;\n latMax = mid;\n }\n }\n \n even = !even;\n bits++;\n \n if (bits === 5) {\n geohash += BASE32[bit];\n bits = 0;\n bit = 0;\n }\n }\n \n return geohash;\n}\n\n/**\n * Decode geohash to get bounding box\n */\nfunction decodeGeohash(geohash: string): { minLat: number; maxLat: number; minLng: number; maxLng: number } {\n const BASE32 = '0123456789bcdefghjkmnpqrstuvwxyz';\n \n let latMin = -90.0;\n let latMax = 90.0;\n let lngMin = -180.0;\n let lngMax = 180.0;\n \n let even = true; // Start with longitude\n \n for (const char of geohash) {\n const idx = BASE32.indexOf(char);\n if (idx === -1) {\n throw new Error(`Invalid geohash character: ${char}`);\n }\n \n for (let i = 4; i >= 0; i--) {\n const bit = (idx >> i) & 1;\n \n if (even) {\n // Longitude\n const mid = (lngMin + lngMax) / 2;\n if (bit === 1) {\n lngMin = mid;\n } else {\n lngMax = mid;\n }\n } else {\n // Latitude\n const mid = (latMin + latMax) / 2;\n if (bit === 1) {\n latMin = mid;\n } else {\n latMax = mid;\n }\n }\n \n even = !even;\n }\n }\n \n return { minLat: latMin, maxLat: latMax, minLng: lngMin, maxLng: lngMax };\n}\n\n/**\n * Validate latitude and longitude\n */\nfunction validateCoordinates(lat: number, lng: number): void {\n if (typeof lat !== 'number' || isNaN(lat) || lat < -90 || lat > 90) {\n throw new Error('Latitude must be a number between -90 and 90');\n }\n if (typeof lng !== 'number' || isNaN(lng) || lng < -180 || lng > 180) {\n throw new Error('Longitude must be a number between -180 and 180');\n }\n}\n\n/**\n * Validate precision\n */\nfunction validatePrecision(precision: number): void {\n if (typeof precision !== 'number' || isNaN(precision) || precision < 1 || precision > 12 || !Number.isInteger(precision)) {\n throw new Error('Precision must be an integer between 1 and 12');\n }\n}\n\nexport default async function(req: Request): Promise {\n try {\n const url = new URL(req.url);\n const pathname = url.pathname;\n \n // Serve frontend files\n if (pathname === '/') {\n const html = await readFile(\"/frontend/index.html\", import.meta.url);\n return new Response(html, {\n headers: { 'Content-Type': 'text/html' }\n });\n }\n \n if (pathname.startsWith('/frontend/')) {\n return serveFile(pathname, import.meta.url);\n }\n \n // Handle geohash API requests\n if (pathname !== '/geohash') {\n return new Response(JSON.stringify({\n error: 'Not found',\n message: 'Available endpoints: / (web interface), /geohash (API)'\n }), {\n status: 404,\n headers: { 'Content-Type': 'application/json' }\n });\n }\n \n let lat: number;\n let lng: number;\n let precision: number = 8; // Default precision\n \n if (req.method === 'GET') {\n // Parse query parameters\n const latParam = url.searchParams.get('lat');\n const lngParam = url.searchParams.get('lng');\n const precisionParam = url.searchParams.get('precision');\n \n if (!latParam || !lngParam) {\n return new Response(JSON.stringify({\n error: 'Missing required parameters',\n message: 'Both lat and lng parameters are required',\n example: '/geohash?lat=40.7128&lng=-74.0060&precision=8'\n }), {\n status: 400,\n headers: { 'Content-Type': 'application/json' }\n });\n }\n \n lat = parseFloat(latParam);\n lng = parseFloat(lngParam);\n \n if (precisionParam) {\n precision = parseInt(precisionParam, 10);\n }\n \n } else if (req.method === 'POST') {\n // Parse JSON body\n const body = await req.json() as GeohashRequest;\n \n if (!body.lat || !body.lng) {\n return new Response(JSON.stringify({\n error: 'Missing required fields',\n message: 'Both lat and lng fields are required in the request body',\n example: { lat: 40.7128, lng: -74.0060, precision: 8 }\n }), {\n status: 400,\n headers: { 'Content-Type': 'application/json' }\n });\n }\n \n lat = body.lat;\n lng = body.lng;\n precision = body.precision || 8;\n \n } else {\n return new Response(JSON.stringify({\n error: 'Method not allowed',\n message: 'Only GET and POST methods are supported'\n }), {\n status: 405,\n headers: { 'Content-Type': 'application/json' }\n });\n }\n \n // Validate inputs\n validateCoordinates(lat, lng);\n validatePrecision(precision);\n \n // Generate geohash\n const geohash = encodeGeohash(lat, lng, precision);\n \n // Get bounding box for the geohash\n const bbox = decodeGeohash(geohash);\n \n const response: GeohashResponse = {\n geohash,\n lat,\n lng,\n precision,\n bbox\n };\n \n return new Response(JSON.stringify(response, null, 2), {\n status: 200,\n headers: { 'Content-Type': 'application/json' }\n });\n \n } catch (error) {\n return new Response(JSON.stringify({\n error: 'Invalid request',\n message: error instanceof Error ? error.message : 'Unknown error occurred'\n }), {\n status: 400,\n headers: { 'Content-Type': 'application/json' }\n });\n }\n}","deleted","label","geohash",[99],"permalink","https://www.val.town/x/anand_g/Geohash/code/geohash.ts","extension","actionData","errors"]