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Merge pull request #40434 from rushatgabhane/validate-redirect
[HelpDot] detect infinite redirect cycles in redirects.csv
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| import {parse} from 'csv-parse'; | ||
| import fs from 'fs'; | ||
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| const parser = parse(); | ||
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| const adjacencyList: Record<string, string[]> = {}; | ||
| const visited: Map<string, boolean> = new Map<string, boolean>(); | ||
| const backEdges: Map<string, boolean> = new Map<string, boolean>(); | ||
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| function addEdge(source: string, target: string) { | ||
| if (!adjacencyList[source]) { | ||
| adjacencyList[source] = []; | ||
| } | ||
| adjacencyList[source].push(target); | ||
| } | ||
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| function isCyclic(currentNode: string): boolean { | ||
| visited.set(currentNode, true); | ||
| backEdges.set(currentNode, true); | ||
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| // Do a depth first search for all the neighbours. If a node is found in backedge, a cycle is detected. | ||
| const neighbours = adjacencyList[currentNode]; | ||
| if (neighbours) { | ||
| for (const node of neighbours) { | ||
| if (!visited.has(node)) { | ||
| if (isCyclic(node)) { | ||
| return true; | ||
| } | ||
| } else if (backEdges.has(node)) { | ||
| return true; | ||
| } | ||
| } | ||
| } | ||
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| backEdges.delete(currentNode); | ||
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| return false; | ||
| } | ||
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| function detectCycle(): boolean { | ||
| for (const [node] of Object.entries(adjacencyList)) { | ||
| if (!visited.has(node)) { | ||
| if (isCyclic(node)) { | ||
| const cycle = Array.from(backEdges.keys()); | ||
| console.log(`Infinite redirect found in the cycle: ${cycle.join(' -> ')} -> ${node}`); | ||
| return true; | ||
| } | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
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| fs.createReadStream(`${process.cwd()}/docs/redirects.csv`) | ||
| .pipe(parser) | ||
| .on('data', (row) => { | ||
| // Create a directed graph of sourceURL -> targetURL | ||
| addEdge(row[0], row[1]); | ||
| }) | ||
| .on('end', () => { | ||
| if (detectCycle()) { | ||
| process.exit(1); | ||
| } | ||
| process.exit(0); | ||
| }); |
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