Created
August 1, 2020 20:55
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import { Store, Parser } from "n3"; | |
import shex from 'shex'; | |
/** | |
* Takes in a turtle representation and returns true if it is a chat | |
* @param {string} chatTtl: The turtle representation of the chat | |
* @param {string} dataUrl: The url of the file the data was at | |
* @param {string} nodeUrl: The url of the | |
* @return {boolean} true if the given data matches a chat | |
*/ | |
export default async function isChatValid(chatTtl, dataUrl, nodeUrl) { | |
// The url you can fetch the shape at | |
const shexcUrl = "http://localhost:3000/shapes?id=https%3A%2F%2Fshaperepo.com%2Fschemas%2Fchat"; | |
// The url of the shape within the Shex Schema that should be validated | |
const shapeUrl = "https://shaperepo.com/schemas/chat#ChatShape" | |
// Create N3 Store | |
const store = await new Promise((resolve, reject) => { | |
const store = Store() | |
new Parser({documentIRI: dataUrl, blankNodePrefix: "", format: "text/turtle"}) | |
.parse(chatTtl, function (error, triple, prefixes) { | |
if (prefixes) { | |
store.addPrefixes(prefixes); | |
} | |
if (error) { | |
reject("error parsing"); | |
} else if (triple) { | |
store.addTriple(triple) | |
} else { | |
resolve(store); | |
} | |
}); | |
}) | |
// Check if the data fits | |
return await shex.Loader.load([shexcUrl], [], [], []).then(function (loaded) { | |
const db = shex.Util.makeN3DB(store); | |
const validator = shex.Validator.construct(loaded.schema, { results: "api" }); | |
const result = validator.validate(db, [{node: nodeUrl, shape: shapeUrl}]); | |
return result[0].status === "conformant" | |
}); | |
} |
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