Created
July 31, 2023 18:19
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Compute Meta Hash
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import { Hash, createHash } from "node:crypto"; | |
import { readdirSync, statSync } from "node:fs"; | |
import { join } from "node:path"; | |
/** | |
* Creates hash of given files/folders. | |
*/ | |
export function computeMetaHash(paths: string[], inputHash?: Hash) { | |
const hash = inputHash ? inputHash : createHash("sha1"); | |
for (const path of paths) { | |
const statInfo = statSync(path); | |
if (statInfo.isDirectory()) { | |
const directoryEntries = readdirSync(path, { withFileTypes: true }); | |
const fullPaths = directoryEntries.map((e) => join(path, e.name)); | |
// recursively walk sub-folders | |
computeMetaHash(fullPaths, hash); | |
} else { | |
const statInfo = statSync(path); | |
// compute hash string name:size:mtime | |
const fileInfo = `${path}:${statInfo.size}:${statInfo.mtimeMs}`; | |
hash.update(fileInfo); | |
} | |
} | |
// if not being called recursively, get the digest and return it as the hash result | |
if (!inputHash) { | |
return hash.digest().toString("base64"); | |
} | |
return; | |
} |
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