Shorten your link with my #Smartcontract.

Shorten the link #smartcontract has been deployed on #XinFin Network and the transaction fees to deploy this smartcontract was 0.00007 XDC. Let me know the transaction fees for deploying the same smartcontract on your #Network.

Here the #smartcontract:
pragma solidity ^0.4.24;
contract e0x {
event LinkVisited(string url, uint linkId);
event LinkAdded(uint linkId, string url);
struct LinkTemplate {
address userAddress;
string url;
}
uint lastLinkId;
mapping (uint => LinkTemplate) public linkMapping;
constructor() public {
lastLinkId = 0;
}
function createNewLink(string url) public returns (uint) {
lastLinkId++;
linkMapping[lastLinkId] = LinkTemplate(msg.sender, url);
emit LinkAdded(lastLinkId, url);
return lastLinkId;
}
modifier linkExists(uint linkId) {
//link with the given hash does not exist
if(linkMapping[linkId].userAddress == 0x0000000000000000000000000000000000000000) {
revert();
}
_;
}
function getLink(uint linkId) linkExists(linkId) public constant
returns(
address,
string
) {
//emit LinkVisited(linkId, link.url);
LinkTemplate memory link = linkMapping[linkId];
return(
link.userAddress,
link.url
);
}
}

Comments

[Thorsten Hirsch]

Using an incremental number (linkId) as the shortened URL lets any user "guess" all shortened URLs anyone has ever added, thus leaks all real URLs of your smart contract.

Also: please use tripple backticks (before the first and after the last code line) instead of single backticks (around each code line) for better visualisation of your code.