1: <?php
  2: 
  3: namespace Liberty;
  4: 
  5: use Liberty\SSV;
  6: use Liberty\LECDSA;
  7: use Liberty\Blockchain;
  8: use Exception;
  9: 
 10: 
 11: /**
 12:  * Liberty Transaction Class
 13:  *
 14:  * @category  Cryptocurrency
 15:  * @package   Liberty
 16:  * @license   http://www.opensource.org/licenses/mit-license.php MIT License
 17:  * @version   1.0.0
 18:  * @since     2018-01-16
 19:  * @author    Liberty Group <cryptolibertygroup@gmail.com>
 20:  */
 21: 
 22: 
 23: class Transaction extends SSV {
 24: 
 25:     public $path;
 26:     public $ec;
 27:     public $bc;
 28:     public $sender;
 29:     public $receiver;
 30:     public $amount;
 31:     public $fee;
 32:     public $time;
 33: 
 34: 
 35: 
 36:     public function __construct($path)
 37:     {
 38:         if($path == "") {
 39:             throw new Exception("Must set the path to transactions file.");
 40:             return false;
 41:         }
 42: 
 43:         $this->path = $path;
 44:         $this->ssv = $path . "/tx-1.ssv";
 45:         $this->ec = new LECDSA();
 46:     }
 47: 
 48: 
 49: 
 50: 
 51:     public function message()
 52:     {
 53:         $sign = $this->sender . " ";
 54:         $sign .= $this->receiver . " ";
 55:         $sign .= $this->amount . " ";
 56:         $sign .= $this->fee . " ";
 57:         $sign .= $this->time;
 58:         return $sign;
 59:     }
 60: 
 61: 
 62: 
 63: 
 64:     public function receiver($message)
 65:     {
 66:         $msg = explode(" ", $message);
 67: 
 68:         if( self::verify($msg[0], $msg[1], $msg[2], $msg[3], $msg[4], $msg[5]) ) {
 69: 
 70:             $res = fopen($this->ssv, "a");
 71:             fputs($res, $message . "\n");
 72:             fclose($res);
 73: 
 74:             return $message;
 75: 
 76:         } else {
 77:             throw new Exception("Transaction has errors.");
 78:             return false;
 79:         }
 80:     }
 81: 
 82: 
 83: 
 84:     public function rtransaction($privk, $receiver, $amount, $fee=0)
 85:     {
 86:         if($privk == "") {
 87:             throw new Exception("Transaction need a private key.");
 88:             return false;
 89:         }
 90: 
 91:         if($receiver == "") {
 92:             throw new Exception("Transaction have not a receiver address.");
 93:             return false;
 94:         }
 95: 
 96:         if($amount == 0) {
 97:             throw new Exception("Transaction have no spend.");
 98:             return false;
 99:         }
100: 
101:         $this->ec->setPrivateKeyWithWif($privk);
102: 
103:         $this->sender = $this->ec->getUncompressedAddress();
104:         $this->receiver = $receiver;
105:         $this->amount = $amount;
106: 
107:         if($fee == 0) {
108:             $this->fee = self::fee($amount);
109:         } else {
110:             $this->fee = $fee;
111:         }
112:         
113:         $this->time = time();
114: 
115:         $transaction = $this->message() . " " . $this->signature();
116: 
117:         return $transaction;
118:     }
119: 
120: 
121: 
122: 
123:     public function signature()
124:     {
125:         /*
126:         echo "----------------------------------------------------" . PHP_EOL;
127:         echo "Raw Priv Key: " . $this->ec->getPrivateKey() . PHP_EOL;
128:         echo "Private Key (WIF): " . $this->ec->getWif() . PHP_EOL;
129:         echo "Public Address: " . $this->ec->getUncompressedAddress() . PHP_EOL;
130:         echo "----------------------------------------------------" . PHP_EOL;
131:         */
132: 
133:         // Sign
134:         $signature =  $this->ec->signMessage($this->message(), true);
135:         return $signature;
136:     }
137: 
138: 
139: 
140: 
141:     public function transaction($privk, $receiver, $amount, $fee=0)
142:     {
143:         if($privk == "") {
144:             throw new Exception("Transaction need a private key.");
145:             return false;
146:         }
147: 
148:         if($receiver == "") {
149:             throw new Exception("Transaction have not a receiver address.");
150:             return false;
151:         }
152: 
153:         if($amount == 0) {
154:             throw new Exception("Transaction have no spend.");
155:             return false;
156:         }
157: 
158:         $this->bc = new Blockchain($this->path);
159: 
160:         $this->ec->setPrivateKeyWithWif($privk);
161: 
162:         $this->sender = $this->ec->getUncompressedAddress();
163:         $this->receiver = $receiver;
164:         $this->amount = $amount;
165: 
166:         if($fee == 0) {
167:             $this->fee = self::fee($amount);
168:         } else {
169:             $this->fee = $fee;
170:         }
171:         
172:         $this->time = time();
173: 
174:         if( $this->bc->balance($this->sender) < ($this->amount + $this->fee) ) {
175:             throw new Exception("Account has not enough funds.");
176:             return false;
177:         }
178: 
179:         $transaction = $this->message() . " " . $this->signature();
180: 
181:         $res = fopen($this->ssv, "a");
182:         fputs($res, $transaction . "\n");
183:         fclose($res);
184: 
185:         return $transaction;
186:     }
187: 
188: 
189: 
190: 
191:     public static function fee($amount)
192:     {
193:         if($amount > 9) {
194:             $fee = $amount * 0.001;
195:         }
196: 
197:         if($amount < 10) {
198:             $fee = 0.01;
199:         }
200: 
201:         $fee = round($fee, 2);
202: 
203:         return $fee;
204:     }
205: 
206: 
207: 
208:     
209:     public static function verify($sender, $receiver, $amount, $fee, $time, $signature)
210:     {
211:         $ec = new LECDSA();
212: 
213:         $msg = $sender . " ";
214:         $msg .= $receiver . " ";
215:         $msg .= $amount . " ";
216:         $msg .= $fee . " ";
217:         $msg .= $time;
218: 
219:         return $ec->checkSignatureForMessage($sender, $signature, $msg);
220:     }
221: 
222: 
223: 
224: }
225: 
226: ?>