The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"id": "ObjStorPatchChain01",
"name": "ifcpipeline \u2014 patch chain & audit trail",
"nodes": [
{
"parameters": {
"content": "## Patch chain & audit trail\n\nDerives **A1 \u2192 A2 \u2192 A3** from `uploads/Elec.ifc`:\n\n1. `IfcBuildingElement`\n2. `IfcDistributionElement` (from A1)\n3. `IfcFlowTerminal` (from A2)\n\nThen pulls the full lineage tree for **A3** and the **root** and composes a summary.\n\nEach `IFC Patch` node polls the `/jobs/{id}/status` endpoint internally (`Wait for Completion = true`) so no external Wait nodes are needed.",
"height": 280,
"width": 420
},
"id": "1c0d3b8e-0000-0000-0000-00000000ff01",
"name": "Readme",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
-720,
-80
]
},
{
"parameters": {},
"id": "1c0d3b8e-0000-0000-0000-000000000001",
"name": "Manual Trigger",
"type": "n8n-nodes-base.manualTrigger",
"typeVersion": 1,
"position": [
-720,
260
]
},
{
"parameters": {
"inputFile": "=uploads/Elec.ifc",
"outputFile": "chain/n8n/A1-building-elements.ifc",
"recipeName": "ExtractElements",
"param_query": "IfcBuildingElement",
"waitForCompletion": true,
"pollingInterval": 2,
"timeout": 300
},
"id": "1c0d3b8e-0000-0000-0000-000000000010",
"name": "A1 \u2014 IfcBuildingElement",
"type": "CUSTOM.ifcPatch",
"typeVersion": 1,
"position": [
-460,
260
],
"credentials": {
"ifcPipelineApi": {
"name": "<your credential>"
}
}
},
{
"parameters": {
"inputFile": "={{ $json.result.output_key }}",
"outputFile": "chain/n8n/A2-distribution.ifc",
"recipeName": "ExtractElements",
"param_query": "IfcDistributionElement",
"waitForCompletion": true,
"pollingInterval": 2,
"timeout": 300
},
"id": "1c0d3b8e-0000-0000-0000-000000000020",
"name": "A2 \u2014 IfcDistributionElement (from A1)",
"type": "CUSTOM.ifcPatch",
"typeVersion": 1,
"position": [
-200,
260
],
"credentials": {
"ifcPipelineApi": {
"name": "<your credential>"
}
}
},
{
"parameters": {
"inputFile": "={{ $json.result.output_key }}",
"outputFile": "chain/n8n/A3-flow-terminals.ifc",
"recipeName": "ExtractElements",
"param_query": "IfcFlowTerminal",
"waitForCompletion": true,
"pollingInterval": 2,
"timeout": 300
},
"id": "1c0d3b8e-0000-0000-0000-000000000030",
"name": "A3 \u2014 IfcFlowTerminal (from A2)",
"type": "CUSTOM.ifcPatch",
"typeVersion": 1,
"position": [
60,
260
],
"credentials": {
"ifcPipelineApi": {
"name": "<your credential>"
}
}
},
{
"parameters": {
"authentication": "predefinedCredentialType",
"nodeCredentialType": "ifcPipelineApi",
"url": "=http://api-gateway/lineage/{{ $json.result.output_key }}",
"options": {}
},
"id": "1c0d3b8e-0000-0000-0000-000000000040",
"name": "Lineage of A3",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
320,
260
],
"credentials": {
"ifcPipelineApi": {
"name": "<your credential>"
}
},
"notes": "Returns ancestors + descendants for the A3 leaf. Ancestors should list A2 \u2192 A1 \u2192 uploads/Elec.ifc."
},
{
"parameters": {
"authentication": "predefinedCredentialType",
"nodeCredentialType": "ifcPipelineApi",
"url": "http://api-gateway/lineage/uploads/Elec.ifc",
"options": {}
},
"id": "1c0d3b8e-0000-0000-0000-000000000041",
"name": "Lineage of root",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
580,
260
],
"credentials": {
"ifcPipelineApi": {
"name": "<your credential>"
}
},
"notes": "Descendants should include A1, A2, A3 (and any other patch derivatives of this root)."
},
{
"parameters": {
"mode": "raw",
"jsonOutput": "={\n \"chain\": [\n {\n \"step\": \"A1 IfcBuildingElement\",\n \"job_id\": \"{{ $('A1 \u2014 IfcBuildingElement').item.json.job_id }}\",\n \"output_key\": \"{{ $('A1 \u2014 IfcBuildingElement').item.json.result.output_key }}\",\n \"sha256\": \"{{ $('A1 \u2014 IfcBuildingElement').item.json.result.sha256 }}\",\n \"size_bytes\": {{ $('A1 \u2014 IfcBuildingElement').item.json.result.size_bytes }}\n },\n {\n \"step\": \"A2 IfcDistributionElement\",\n \"job_id\": \"{{ $('A2 \u2014 IfcDistributionElement (from A1)').item.json.job_id }}\",\n \"output_key\": \"{{ $('A2 \u2014 IfcDistributionElement (from A1)').item.json.result.output_key }}\",\n \"sha256\": \"{{ $('A2 \u2014 IfcDistributionElement (from A1)').item.json.result.sha256 }}\",\n \"size_bytes\": {{ $('A2 \u2014 IfcDistributionElement (from A1)').item.json.result.size_bytes }}\n },\n {\n \"step\": \"A3 IfcFlowTerminal\",\n \"job_id\": \"{{ $('A3 \u2014 IfcFlowTerminal (from A2)').item.json.job_id }}\",\n \"output_key\": \"{{ $('A3 \u2014 IfcFlowTerminal (from A2)').item.json.result.output_key }}\",\n \"sha256\": \"{{ $('A3 \u2014 IfcFlowTerminal (from A2)').item.json.result.sha256 }}\",\n \"size_bytes\": {{ $('A3 \u2014 IfcFlowTerminal (from A2)').item.json.result.size_bytes }}\n }\n ],\n \"A3_ancestors\": {{ JSON.stringify($('Lineage of A3').item.json.ancestors) }},\n \"root_descendants\": {{ JSON.stringify($('Lineage of root').item.json.descendants) }}\n}",
"options": {}
},
"id": "1c0d3b8e-0000-0000-0000-000000000050",
"name": "Summary",
"type": "n8n-nodes-base.set",
"typeVersion": 3.4,
"position": [
840,
260
]
}
],
"connections": {
"Manual Trigger": {
"main": [
[
{
"node": "A1 \u2014 IfcBuildingElement",
"type": "main",
"index": 0
}
]
]
},
"A1 \u2014 IfcBuildingElement": {
"main": [
[
{
"node": "A2 \u2014 IfcDistributionElement (from A1)",
"type": "main",
"index": 0
}
]
]
},
"A2 \u2014 IfcDistributionElement (from A1)": {
"main": [
[
{
"node": "A3 \u2014 IfcFlowTerminal (from A2)",
"type": "main",
"index": 0
}
]
]
},
"A3 \u2014 IfcFlowTerminal (from A2)": {
"main": [
[
{
"node": "Lineage of A3",
"type": "main",
"index": 0
}
]
]
},
"Lineage of A3": {
"main": [
[
{
"node": "Lineage of root",
"type": "main",
"index": 0
}
]
]
},
"Lineage of root": {
"main": [
[
{
"node": "Summary",
"type": "main",
"index": 0
}
]
]
}
},
"active": false,
"settings": {
"executionOrder": "v1"
},
"tags": [
{
"name": "ifcpipeline"
},
{
"name": "object-storage"
},
{
"name": "audit-trail"
}
]
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
ifcPipelineApi
Pro
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About this workflow
ifcpipeline — patch chain & audit trail. Uses CUSTOM, httpRequest. Event-driven trigger; 8 nodes.
Source: https://github.com/jonatanjacobsson/ifcpipeline/blob/abdf5631cb34be429408280d3623ae35ab9b970e/n8n-workflows/patch-chain-audit-trail.json — original creator credit. Request a take-down →
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