/**
* Let's insert a block into our blockchain.
*
* @param stirng $jsondata
* @param string $merkleroot
* @param int $blockId
* @param string $prevhash
*/
private function insertBlock($jsondata, $merkleroot, $blockId, $prevhash)
{
$msg = \json_decode($jsondata, true);
// This still ought to be a JSON encoded string:
$blockdata = \base64_decode($msg['blockdata']);
$mtree = new Structs\MerkleTree(\json_decode($blockdata, true));
/* 1. Verify merkle root (both should be hex encoded) */
if (!\hash_equals($merkleroot, $mtree->getRoot())) {
echo \json_encode(['error' => 'Invalid Merkle Root.'], JSON_PRETTY_PRINT);
exit;
}
// Grab previous tailhash:
$tail = $this->db->selectRow('blocks', ['id', 'hash'], [], [['id', DESC]]);
// If our previous hash does not equal the pointer to the prevhash in
// the current block, something screwy is going on.
if (!\hash_equals($tail['hash'], $prevhash)) {
echo \json_encode(['error' => 'Blockchain tail hash mismatch!'], JSON_PRETTY_PRINT);
exit;
}
// Update previous tail block to point to the new addition
$this->db->update('blocks', ['nexthash' => $merkleroot, 'nextblock' => $blockId], ['id' => $tail['id']]);
// Insert a new block
return $this->db->insert('blocks', ['id' => $blockId, 'hash' => $merkleroot, 'prevblock' => $tail['id'], 'prevhash' => $tail['hash'], 'contents' => $blockdata, 'verified' => 0]);
}
public function testHash()
{
$tree1 = new Structs\MerkleTree(['a', 'b', 'c', 'd', 'e']);
$tree2 = new Structs\MerkleTree(['a', 'b', 'c', 'd', 'e', 'e', 'e', 'e']);
$this->assertTrue(\hash_equals($tree1->getRoot(), $tree2->getRoot()));
}
