Create Password.sol

Password.sol

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.4.22 <0.9.0;
+
+
+// Contract
+contract SimpleStorage {
+
+ //Variables
+ string[] sites;
+ string[] usernames;
+ string[] passwords;
+
+ /*
+ We use this to ensure that all transactions are only performed by the authorized user.
+
+ We check the validity using 
+ require(
+ msg.sender == user_adress,
+ "Only the authorizer of the contract can add a password."
+ );
+
+ in all functions that alter the variables after the contract has been created.
+ */
+ address user_adress;
+
+ // When a new contract is created
+ constructor() public {
+ user_adress = msg.sender;
+ sites = new string[](0);
+ usernames = new string[](0);
+ passwords = new string[](0);
+ }
+
+ /*
+ Code to check if two strings are equivalent.
+ We do this by splitting them up and then checking if all of the individual characters match each other.
+ */
+ function compareStrings(string memory a, string memory b) private returns (bool) {
+ return (keccak256(abi.encodePacked((a))) == keccak256(abi.encodePacked((b))));
+ }
+
+
+ // Used to store a new uername password pair in the contract
+ function addPassword(string sitename, string username, string password) public {
+ require(
+ msg.sender == user_adress,
+ "Only the authorizer of the contract can add a password."
+ );
+ passwords.push(password);
+ usernames.push(username);
+ sites.push(sitename);
+ }
+
+ // Get a saved password for an individual site
+ function getFromSite(string site) public view returns (string details) {
+ require(
+ msg.sender == user_adress,
+ "Only the authorizer of the contract can request access to a password."
+ );
+ for (uint i = 0; i < sites.length; i++) {
+ if (compareStrings(site, sites[i])) {
+ return string(abi.encodePacked("Site name: ", site, " Username: ", usernames[i], " Password: ", passwords[i]));
+ }
+ }
+ }
+
+ // Get a list of all passwords saved
+ function getAllPasswords() public view returns (string details) {
+ details = "";
+ require(
+ msg.sender == user_adress,
+ "Only the authorizer of the contract can request access to a password."
+ );
+ for (uint i = 0; i < sites.length; i++) {
+ details = string(abi.encodePacked(details, "Site name: ", sites[i], " Username: ", usernames[i], " Password: ", passwords[i]));
+ details = string(abi.encodePacked(details, " ; "));
+ }
+ return details;
+ }
+}