Current File : /home/opti/workflow/node_modules/aws-sdk/lib/services/glacier.js
var AWS = require('../core');
AWS.util.update(AWS.Glacier.prototype, {
/**
* @api private
*/
setupRequestListeners: function setupRequestListeners(request) {
if (Array.isArray(request._events.validate)) {
request._events.validate.unshift(this.validateAccountId);
} else {
request.on('validate', this.validateAccountId);
}
request.on('build', this.addGlacierApiVersion);
request.on('build', this.addTreeHashHeaders);
},
/**
* @api private
*/
validateAccountId: function validateAccountId(request) {
if (request.params.accountId !== undefined) return;
request.params = AWS.util.copy(request.params);
request.params.accountId = '-';
},
/**
* @api private
*/
addGlacierApiVersion: function addGlacierApiVersion(request) {
var version = request.service.api.apiVersion;
request.httpRequest.headers['x-amz-glacier-version'] = version;
},
/**
* @api private
*/
addTreeHashHeaders: function addTreeHashHeaders(request) {
if (request.params.body === undefined) return;
var hashes = request.service.computeChecksums(request.params.body);
request.httpRequest.headers['x-amz-content-sha256'] = hashes.linearHash;
if (!request.httpRequest.headers['x-amz-sha256-tree-hash']) {
request.httpRequest.headers['x-amz-sha256-tree-hash'] = hashes.treeHash;
}
},
/**
* @!group Computing Checksums
*/
/**
* Computes the SHA-256 linear and tree hash checksums for a given
* block of Buffer data. Pass the tree hash of the computed checksums
* as the checksum input to the {completeMultipartUpload} when performing
* a multi-part upload.
*
* @example Calculate checksum of 5.5MB data chunk
* var glacier = new AWS.Glacier();
* var data = new Buffer(5.5 * 1024 * 1024);
* data.fill('0'); // fill with zeros
* var results = glacier.computeChecksums(data);
* // Result: { linearHash: '68aff0c5a9...', treeHash: '154e26c78f...' }
* @param data [Buffer, String] data to calculate the checksum for
* @return [map<linearHash:String,treeHash:String>] a map containing
* the linearHash and treeHash properties representing hex based digests
* of the respective checksums.
* @see completeMultipartUpload
*/
computeChecksums: function computeChecksums(data) {
if (!AWS.util.Buffer.isBuffer(data)) data = new AWS.util.Buffer(data);
var mb = 1024 * 1024;
var hashes = [];
var hash = AWS.util.crypto.createHash('sha256');
// build leaf nodes in 1mb chunks
for (var i = 0; i < data.length; i += mb) {
var chunk = data.slice(i, Math.min(i + mb, data.length));
hash.update(chunk);
hashes.push(AWS.util.crypto.sha256(chunk));
}
return {
linearHash: hash.digest('hex'),
treeHash: this.buildHashTree(hashes)
};
},
/**
* @api private
*/
buildHashTree: function buildHashTree(hashes) {
// merge leaf nodes
while (hashes.length > 1) {
var tmpHashes = [];
for (var i = 0; i < hashes.length; i += 2) {
if (hashes[i + 1]) {
var tmpHash = new AWS.util.Buffer(64);
tmpHash.write(hashes[i], 0, 32, 'binary');
tmpHash.write(hashes[i + 1], 32, 32, 'binary');
tmpHashes.push(AWS.util.crypto.sha256(tmpHash));
} else {
tmpHashes.push(hashes[i]);
}
}
hashes = tmpHashes;
}
return AWS.util.crypto.toHex(hashes[0]);
}
});
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