DIGIPIN の生成と復号化を行う

• •HTTP Webhookエンドポイント（n8nが自動生成）

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        "jsCode": "// --- DIGIPIN Generation Logic ---\n\n// Constants for DIGIPIN generation\nconst DIGIPIN_GRID = [\n    ['F', 'C', '9', '8'],\n    ['J', '3', '2', '7'],\n    ['K', '4', '5', '6'],\n    ['L', 'M', 'P', 'T']\n];\n\nconst BOUNDS = {\n    minLat: 2.5,\n    maxLat: 38.5,\n    minLon: 63.5,\n    maxLon: 99.5\n};\n\n/**\n * Encodes latitude and longitude into a DIGIPIN.\n * @param {number} lat The latitude.\n * @param {number} lon The longitude.\n * @returns {string} The generated DIGIPIN.\n * @throws {Error} If coordinates are out of bounds.\n */\nfunction generateDigiPin(lat, lon) {\n    if (lat < BOUNDS.minLat || lat > BOUNDS.maxLat || lon < BOUNDS.minLon || lon > BOUNDS.maxLon) {\n        throw new Error(`Coordinates (Lat: ${lat}, Lon: ${lon}) are out of the valid range.`);\n    }\n\n    let minLat = BOUNDS.minLat, maxLat = BOUNDS.maxLat;\n    let minLon = BOUNDS.minLon, maxLon = BOUNDS.maxLon;\n    let digiPin = '';\n\n    for (let level = 1; level <= 10; level++) {\n        const latDiv = (maxLat - minLat) / 4;\n        const lonDiv = (maxLon - minLon) / 4;\n        let row = 3 - Math.floor((lat - minLat) / latDiv);\n        let col = Math.floor((lon - minLon) / lonDiv);\n        row = Math.max(0, Math.min(row, 3));\n        col = Math.max(0, Math.min(col, 3));\n        digiPin += DIGIPIN_GRID[row][col];\n        if (level === 3 || level === 6) {\n            digiPin += '-';\n        }\n        maxLat = minLat + latDiv * (4 - row);\n        minLat = minLat + latDiv * (3 - row);\n        minLon = minLon + lonDiv * col;\n        maxLon = minLon + lonDiv;\n    }\n    return digiPin;\n}\n\n\n// --- n8n Item Processing ---\n// Loop through each input item provided to the node.\nfor (const item of items) {\n    try {\n        // Get latitude and longitude from the input item's JSON data.\n        // Assumes the previous node provides these fields.\n        const lat = $input.first().json.query.lat;\n        const lon = $input.first().json.query.lon;\n\n        if (lat === undefined || lon === undefined) {\n            throw new Error(\"Input item is missing 'latitude' or 'longitude' field.\");\n        }\n\n        // Generate the DIGIPIN.\n        const digipinResult = generateDigiPin(lat, lon);\n\n        // Add the result to a new field called 'digipin' in the item's JSON.\n        item.json.digipin = digipinResult;\n\n    } catch (error) {\n        // If an error occurs, add an 'error' field to the item.\n        // This helps with debugging in the n8n UI.\n        item.json.error = error.message;\n    }\n}\n\n// Return all the modified items to the next node in the workflow.\nreturn items;\n"
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        "jsCode": "/**\n * Decodes a DIGIPIN into latitude and longitude coordinates.\n * @param {string} digiPin The DIGIPIN to decode.\n * @returns {{latitude: string, longitude: string}} An object containing the latitude and longitude,\n * each formatted to 6 decimal places.\n * @throws {Error} If the DIGIPIN is invalid or contains invalid characters.\n */\nconst DIGIPIN_GRID = [\n    ['F', 'C', '9', '8'],\n    ['J', '3', '2', '7'],\n    ['K', '4', '5', '6'],\n    ['L', 'M', 'P', 'T']\n];\n\n\nconst BOUNDS = {\n    minLat: 2.5,\n    maxLat: 38.5,\n    minLon: 63.5,\n    maxLon: 99.5\n};\nfunction getLatLngFromDigiPin(digiPin) {\n    const pin = digiPin.replace(/-/g, ''); // Remove hyphens for processing\n    if (pin.length !== 10) throw new Error('Invalid DIGIPIN: Must be 10 characters long after removing hyphens.');\n\n    let minLat = BOUNDS.minLat;\n    let maxLat = BOUNDS.maxLat;\n    let minLon = BOUNDS.minLon;\n    let maxLon = BOUNDS.minLon; // Corrected initial value here, should be BOUNDS.minLon\n\n    // Recalculate maxLon for accurate initial bounds\n    // Based on the original DIGIPIN generation, it should cover the whole range initially.\n    maxLon = BOUNDS.maxLon;\n\n\n    for (let i = 0; i < 10; i++) {\n        const char = pin[i];\n        let found = false;\n        let ri = -1, ci = -1;\n\n        for (let r = 0; r < 4; r++) {\n            for (let c = 0; c < 4; c++) {\n                if (DIGIPIN_GRID[r][c] === char) {\n                    ri = r;\n                    ci = c;\n                    found = true;\n                    break;\n                }\n            }\n            if (found) break;\n        }\n\n        if (!found) throw new Error(`Invalid character '${char}' in DIGIPIN.`);\n\n        const latDiv = (maxLat - minLat) / 4;\n        const lonDiv = (maxLon - minLon) / 4;\n\n        const lat1 = maxLat - latDiv * (ri + 1);\n        const lat2 = maxLat - latDiv * ri;\n        const lon1 = minLon + lonDiv * ci;\n        const lon2 = minLon + lonDiv * (ci + 1);\n\n        minLat = lat1;\n        maxLat = lat2;\n        minLon = lon1;\n        maxLon = lon2;\n    }\n\n    const centerLat = (minLat + maxLat) / 2;\n    const centerLon = (minLon + maxLon) / 2;\n\n    return {\n        latitude: centerLat.toFixed(6),\n        longitude: centerLon.toFixed(6)\n    };\n}\n\n\nconst MY_DIGIPIN = $input.first().json.query.digipin; // <--- REPLACE THIS with your desired DIGIPIN\n\n// Ensure there's at least one item to process, or create a dummy one\nlet outputItems = [];\nif (items.length === 0) {\n    // If no items come into the node, create a blank one to attach results to\n    outputItems.push({ json: {} });\n} else {\n    // If items exist, clone them to add results\n    outputItems = JSON.parse(JSON.stringify(items));\n}\n\nfor (const item of outputItems) {\n    try {\n        const digipinToProcess = MY_DIGIPIN;\n\n        if (!digipinToProcess) {\n            throw new Error(\"No DIGIPIN specified for processing.\");\n        }\n\n        // Decode the DIGIPIN\n        const decodedCoords = getLatLngFromDigiPin(digipinToProcess);\n\n        // Add the result to new fields in the item's JSON\n        item.json.processedDigipin = digipinToProcess; // Optional: To see which digipin was processed\n        item.json.decodedLatitude = decodedCoords.latitude;\n        item.json.decodedLongitude = decodedCoords.longitude;\n\n    } catch (error) {\n        // If an error occurs, add an 'error' field to the item.\n        item.json.error = error.message;\n    }\n}\n\n// Return all the modified items to the next node in the workflow.\nreturn outputItems;"
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        "content": "## Example usage \n\nGenerate a DIGIPIN:\n```\ncurl --request GET \\\n  --url 'https://n8n.example.in/webhook/generate-digipin?lat=27.175063&lon=78.042169'\n```\n\nDecode a DIGIPIN:\n```\ncurl --request GET \\\n  --url 'https://n8n.example.in/webhook/decode-digipin?digipin=32C-849-5CJ6'\n```"
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        "content": "## DIGIPIN Generator and Decoder\n\nThis n8n workflow lets you **generate and decode DIGIPINs** using only JavaScript - no external APIs involved.\n\nDIGIPIN is India Post’s geolocation code system that encodes latitude and longitude into a 10-character alphanumeric string, like `32C-849-5CJ6`. It helps simplify precise location sharing across India.\n\n### 🔧 What it does\n- `/generate-digipin?lat=...&lon=...` → returns the DIGIPIN for given coordinates\n- `/decode-digipin?digipin=...` → returns the coordinates for a given DIGIPIN\n\nUseful for: check-in systems, last-mile delivery, digital address verification, or simple location sharing.\n\n### ⚙️ How to use\n- Add your own webhook URLs or run locally\n- Pass query parameters to trigger either route\n- Both encode/decode logic is handled inside Function nodes\n\nNo credentials, APIs, or setup required.\n"
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