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get-url-hash.js
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39 lines (37 loc) · 1.18 KB
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const AWS = require('aws-sdk');
const lambda = new AWS.Lambda({
credentials: {
accessKeyId: process.env.AWS_LAMBDA_EXECUTE_KEY,
secretAccessKey: process.env.AWS_LAMBDA_EXECUTE_SECRET
},
region: 'us-east-1'
});
module.exports = async function getUrlHash (targetUrl, algorithm = 'sha256', attempts = 3) {
try {
return new Promise((resolve, reject) => {
lambda.invoke({
FunctionName: 'hasher',
Payload: JSON.stringify({
targetUrl,
algorithm
})
}, (err, data) => {
if (err) return reject(err);
try {
const response = JSON.parse(data.Payload);
if (response.statusCode !== 200) return reject(new Error('non-200 status code received from hasher function'));
if (!response.hash) return reject(new Error('Successful lambda call but failed to get valid hash'));
resolve(response.hash);
} catch (err) {
return reject(err);
}
});
});
} catch (err) {
if (attempts > 1) {
console.error('Failed to get URL hash for', targetUrl, 'we will retry', err);
return getUrlHash(targetUrl, algorithm, attempts - 1);
}
throw err;
}
};