Validate Totp Token Without Creating A Credential

About This Script

Features:

• Conditional logic and branching

{
    "nodes": [
        {
            "id": "56f102c4-5b84-4e30-955c-0ea1221c328f",
            "name": "When clicking \u2018Test workflow\u2019",
            "type": "n8n-nodes-base.manualTrigger",
            "position": [
                480,
                680
            ],
            "parameters": [],
            "typeVersion": 1
        },
        {
            "id": "4f562819-ee42-42ad-b821-aff2cbebbc0f",
            "name": "TOTP VALIDATION",
            "type": "n8n-nodes-base.code",
            "position": [
                920,
                680
            ],
            "parameters": {
                "language": "python",
                "pythonCode": "import hmac\nimport hashlib\nimport time\nimport base64\n\ndef base32_decode(key):\n    \"\"\"Decodes a base32 key into bytes\"\"\"\n    key += '=' * (-len(key) % 8)  # Add necessary '=' for valid length\n    return base64.b32decode(key.upper(), casefold=True)\n\ndef generate_totp(secret, interval=30, digits=6):\n    \"\"\"Generates a TOTP code based on a secret key\"\"\"\n    interval_count = int(time.time() // interval)\n    interval_bytes = interval_count.to_bytes(8, byteorder='big')\n\n    hmac_hash = hmac.new(secret, interval_bytes, hashlib.sha1).digest()\n    \n    offset = hmac_hash[-1] & 0x0F\n    binary_code = ((hmac_hash[offset] & 0x7F) << 24 |\n                   (hmac_hash[offset + 1] & 0xFF) << 16 |\n                   (hmac_hash[offset + 2] & 0xFF) << 8 |\n                   (hmac_hash[offset + 3] & 0xFF))\n    \n    otp_code = binary_code % (10 ** digits)\n    \n    # Format with leading zeros if necessary\n    otp_code_str = str(otp_code).zfill(digits)\n    \n    return otp_code_str\n\ndef verify_totp(secret, code, interval=30, digits=6):\n    \"\"\"Checks whether the TOTP code is valid\"\"\"\n    secret_bytes = base32_decode(secret)\n    generated_code = generate_totp(secret_bytes, interval, digits)\n    \n    return generated_code == code\n\n# Example of use\nsecret = _input.item.json.totp_secret_example  # Secret key base32 (example)\ncode =  _input.item.json.code_to_verify_example # Code to check (example)\n\n# Return 1 if code is valid. Return 0 if invalid\nif verify_totp(secret, code):\n    return [{\"status\": 1}]\nelse:\n    return [{\"status\": 0}]"
            },
            "typeVersion": 2
        },
        {
            "id": "9760b31c-5ba8-4001-9cbe-2be2ae58d58e",
            "name": "IF CODE IS VALID",
            "type": "n8n-nodes-base.if",
            "position": [
                1140,
                680
            ],
            "parameters": {
                "options": [],
                "conditions": {
                    "options": {
                        "leftValue": "",
                        "caseSensitive": true,
                        "typeValidation": "strict"
                    },
                    "combinator": "and",
                    "conditions": [
                        {
                            "id": "470cf368-daee-4136-b907-a3539765871d",
                            "operator": {
                                "type": "number",
                                "operation": "equals"
                            },
                            "leftValue": "={{ $json.status }}",
                            "rightValue": 1
                        }
                    ]
                }
            },
            "typeVersion": 2.1
        },
        {
            "id": "3a029863-8fd0-42ef-b8ff-9f7cdf6e8d94",
            "name": "Sticky Note",
            "type": "n8n-nodes-base.stickyNote",
            "position": [
                440,
                180
            ],
            "parameters": {
                "width": 883,
                "height": 430,
                "content": "Configuration note: update with your credentials or endpoint.",
                "color": "#FFF59D"
            },
            "typeVersion": 1
        },
        {
            "id": "f660a50f-2c33-49bb-b975-8d51e9bf24ed",
            "name": "EXAMPLE FIELDS",
            "type": "n8n-nodes-base.set",
            "position": [
                700,
                680
            ],
            "parameters": {
                "options": [],
                "assignments": {
                    "assignments": [
                        {
                            "id": "03a66bf9-1bf4-44c0-92e0-edd45929e467",
                            "name": "code_to_verify_example",
                            "type": "string",
                            "value": "516620"
                        },
                        {
                            "id": "7bb18b0a-1851-4f27-a91f-5f93b663cfd0",
                            "name": "totp_secret_example",
                            "type": "string",
                            "value": "CNSUKUMZLQJEZJ3"
                        }
                    ]
                }
            },
            "typeVersion": 3.4
        }
    ],
    "connections": {
        "EXAMPLE FIELDS": {
            "main": [
                [
                    {
                        "node": "TOTP VALIDATION",
                        "type": "main",
                        "index": 0
                    }
                ]
            ]
        },
        "TOTP VALIDATION": {
            "main": [
                [
                    {
                        "node": "IF CODE IS VALID",
                        "type": "main",
                        "index": 0
                    }
                ]
            ]
        },
        "When clicking \u2018Test workflow\u2019": {
            "main": [
                [
                    {
                        "node": "EXAMPLE FIELDS",
                        "type": "main",
                        "index": 0
                    }
                ]
            ]
        }
    },
    "n8n_version": "1.5.0"
}

Requirements