init'ish

README.md

@@ -1,3 +1,49 @@
 # small-memory
 
-A small database engine in php. Perfect for small ARM devices and low usage.
+A small database engine in php. Perfect for small ARM devices and low usage. NOT SECURE.
+
+## Usage
+
+Call the script with a GET parameter "query" (by default). The value must be in Base64. There is no "access control".
+
+### Create Database
+
+```
+CREATE DATABASE mydatabase
+```
+
+### Create Table
+
+```
+CREATE TABLE mytable IN mydatabase (field1,field2,[...])
+```
+
+### Insert
+
+```
+INSERT INTO mytable IN mydatabase ({"key":"value"})
+```
+
+### Select
+
+```
+SELECT mytable IN mydatabase (*)
+```
+
+OR
+
+```
+SELECT mytable IN mydatabase ({"key":"value"})
+```
+
+### Update
+
+```
+UPDATE mytable IN mydatabase ({"UnidID":"UniqID_Value","key":"new_value"})
+```
+
+### Delete
+
+```
+DELETE mytable IN mydatabase ({"UnidID":"UniqID_Value"})
+```

api_keys.json.exemple

@@ -0,0 +1 @@
+{"keys":["example_A","example_B"]}

index.php

@@ -0,0 +1,260 @@
+<?php
+	header('Content-Type: application/json');
+	class dsm {
+	
+		private	$datadir = "./data/";
+		public	$uid_prefix = "dsm_uid_";
+		public	$search_id = "uniqid";
+		public	$get_param = "query";
+		public	$iKey = 1;
+		public	$arrKeys = array();
+		public function delete($data, &$iFound)
+		{
+			$iFound = 1;
+			$result = array();
+			$result['iCode'] = 1;
+			if ($this->vtb($data, $r))
+			{
+				$r['json'] = json_decode($r['json'], true);
+				if (isset($r['json'][$this->search_id]))
+				{
+					if (strlen($r['json'][$this->search_id]) > 0 && strlen($r['database']) > 0 && strlen($r['table']) > 0)
+					{
+						$d = array_diff(scandir($this->datadir.$r['database'].'/'.$r['table'].'/'.$r['json'][$this->search_id], 1), array('.', '..'));
+						foreach ($d as $item => $val)
+						{
+							unlink($this->datadir.$r['database'].'/'.$r['table'].'/'.$r['json'][$this->search_id].'/'.$val);
+						}
+						if(rmdir($this->datadir.$r['database'].'/'.$r['table'].'/'.$r['json'][$this->search_id].'/'))
+							$result['iCode'] = 0;
+					}
+				}
+			}
+			echo json_encode($result);
+		}
+		
+		public function update($data, &$iFound)
+		{
+			$iFound = 1;
+			$result = array();
+			if ($this->vtb($data, $r))
+			{
+				$r['json'] = json_decode($r['json'], true);
+				if (!isset($r['json'][$this->search_id]))
+				{
+					$result['iCode'] = 1;
+					$result['message'] = "Error: no key used";
+				}
+				else
+				{
+					$m = explode(",", file_get_contents($this->datadir.$r['database'].'/'.$r['table'].'/meta'));
+					foreach ($r['json'] as $kk => $vv)
+						if (in_array($kk, $m))
+							file_put_contents($this->datadir.$r['database'].'/'.$r['table'].'/'.$r['json'][$this->search_id].'/'.$kk, $vv);
+					$result['iCode'] = 0;
+					$result['j'] = $r['json'];
+					$result['uid'] = $r['json'][$this->search_id];
+					
+				}
+			}
+			echo json_encode($result);
+		}
+		
+		public function select($data, &$iFound)
+		{
+			$iFound = 1;
+			$iMode = 0;
+			$itmp = 0;
+			if($this->vtb($data, $r))
+			{
+				$d = array_diff(scandir($this->datadir.$r['database'].'/'.$r['table'], 1), array('.', '..', 'meta'));
+				if ($r['json'] != '*')
+				{
+					$iMode = 1;
+					$r['json'] = json_decode($r['json']);
+				}
+				
+				$result = array();
+				$result['content'] = array();
+				foreach ($d as $key => $value)
+				{
+					$result['content'][$value] = array();
+					$m = explode(",", file_get_contents($this->datadir.$r['database'].'/'.$r['table'].'/meta'));
+					// TODO: Will create problem. fetch all then remove. Bad.
+					foreach ($m as $skey => $svalue)
+					{
+						$result['content'][$value][$svalue] = file_get_contents($this->datadir.$r['database'].'/'.$r['table'].'/'.$value.'/'.$svalue);
+						
+						$result['content'][$value][$svalue.'_suri'] = $this->datadir.$r['database'].'/'.$r['table'].'/'.$value.'/'.$svalue;
+					}
+					
+					$result['content'][$value]['uid'] = $value;
+					array_push($m, 'uid');
+					// Remove item that dont fit if mode allow it.
+					if ($iMode == 1)
+						foreach ($m as $skey => $svalue)
+							foreach ($r['json'] as $kk => $vv)
+								if ($kk == $svalue)
+									if ($result['content'][$value][$svalue] != $vv)
+										unset($result['content'][$value]);	
+				}
+				$result['iCode'] = 0;
+			}
+			else
+			{
+				$result['iCode'] = 1;
+			}
+			echo json_encode($result);
+		}
+		
+		public function insert($data, &$iFound)
+		{
+			$iFound = 1;
+			if($this->vtb($data, $r))
+			{
+				$r['json'] = json_decode($r['json'], true);
+				// create a random id.
+				$id = uniqid($this->uid_prefix,true);
+				// create a blank entry
+				mkdir($this->datadir.$r['database'].'/'.$r['table'].'/'.$id.'/', 0777, true);
+				// create base from meta
+				$m = explode(",", file_get_contents($this->datadir.$r['database'].'/'.$r['table'].'/meta'));
+				foreach ($m as $key => $value)
+				{
+					if (isset($r['json'][$value]))
+						file_put_contents($this->datadir.$r['database'].'/'.$r['table'].'/'.$id.'/'.$value, $r['json'][$value]);
+					else
+						file_put_contents($this->datadir.$r['database'].'/'.$r['table'].'/'.$id.'/'.$value, "");
+				}
+				echo json_encode(array("iCode" => 0, "uid" => $id));
+			}
+			else
+			{
+				echo json_encode(array("iCode" => 1, "message" => "Structural error."));
+			}
+			
+		}
+		// Validate if the table and database exist.
+		public function	vtb($data, &$r)
+		{
+			
+			$x = strpos($data, " IN ");
+			$y = strpos($data, " (");
+			if ($x !== false && $x > 0)
+				if ($this->dbexist($r['database'] = substr($data, $x + 4, $y - ($x + 4))))
+					if(is_writable($this->datadir))
+						if (strlen($r['table'] = substr($data, 0, $x)) > 0)
+							if (strlen($r['json'] = substr($data, $y + 2, strlen($data) - $y - 3 )) > 0)
+								return (1);
+			return (0);
+		}
+		
+		public function create_table($sName, &$iFound)
+		{
+			$sdbname = "";
+			$stbname = "";
+			$x = strpos($sName, " IN ");
+			$y = strpos($sName, " (");
+			if ($x !== false && $x > 0)
+			{
+				$sdbname = substr($sName, $x + 4, $y - ($x + 4));
+				if ($this->dbexist($sdbname))
+				{
+					if(is_writable($this->datadir))
+					{
+						$stbname = substr($sName, 0, $x);
+						if (mkdir($this->datadir.$sdbname.'/'.$stbname, 0777, true))
+						{
+							file_put_contents($this->datadir.$sdbname.'/'.$stbname.'/meta', substr($sName, $y + 2, strlen($sName) - $y - 3));
+						}
+						else
+						{
+							echo json_encode(array("iCode" => 1, "message" => "Table exist"));
+						}
+					}
+				}
+				else
+				{
+					// TODO: Database does not exist or error
+				}
+			}
+			$iFound = 1;
+		}
+		
+		public function create_database($sName, &$iFound)
+		{
+			$sName = str_replace(' ', '_', $sName);
+			$iFound = 1;
+			if (!$this->dbexist($sName)) {
+				if(is_writable($this->datadir))
+				{
+					if(mkdir($this->datadir.$sName.'/', 0777, true))
+						echo json_encode(array("iCode" => 0, "message" => "Database created"));
+					else
+						echo json_encode(array("iCode" => 1, "message" => "Error: Database not created"));
+				}
+				else
+				{
+					echo json_encode(array("iCode" => 1, "message" => "Error: Database not created : Data folder not writable."));
+				}
+			} else {
+				echo json_encode(array("iCode" => 1, "message" => "Database exist"));
+			}
+		}
+		
+		public function dbexist($sName)
+		{
+			if (strlen($sName) > 0)
+				if (file_exists($this->datadir.$sName.'/')) 
+					return (1);
+			return (0);
+		}
+		
+		public function extract_query($query)
+		{
+			$iFound = 0;
+			
+			if (($pos = strpos($query, 'CREATE DATABASE ')) === 0)
+				$this->create_database(substr($query, 16, strlen($query) - 16), $iFound);
+			if (($pos = strpos($query, 'CREATE TABLE ')) === 0)
+				$this->create_table(substr($query, 13, strlen($query) - 13), $iFound);
+			if (($pos = strpos($query, 'INSERT INTO ')) === 0)
+				$this->insert(substr($query, 12, strlen($query) - 12), $iFound);
+			if (($pos = strpos($query, 'SELECT ')) === 0)
+				$this->select(substr($query, 7, strlen($query) - 7), $iFound);
+			if (($pos = strpos($query, 'UPDATE ')) === 0)
+				$this->update(substr($query, 7, strlen($query) - 7), $iFound);
+			if (($pos = strpos($query, 'DELETE ')) === 0)
+				$this->delete(substr($query, 7, strlen($query) - 7), $iFound);
+			
+			 
+			
+			if(!$iFound)
+				echo json_encode(array("iCode" => 1, "message" => "Error while extrapolating the query."));
+		}
+	
+		public function init()
+		{
+		    $this->arrKeys = json_decode(file_get_contents("./api_keys.json"), true);
+		    if ($this->arrKeys == NULL)
+		    {
+		        echo json_encode(array("iCode" => -1, "message" => "Internal error: Error reading api_keys.json"));
+		        return (NULL);
+		    }
+		    $this->arrKeys = $this->arrKeys["keys"];
+			if(!isset($_GET['query']))
+				echo json_encode(array("iCode" => -1, "message" => "no query recived."));
+			else
+				if($this->iKey)
+				{
+					if(isset($_GET['key']))
+						if(in_array($_GET['key'], $this->arrKeys))
+							$this->extract_query(base64_decode($_GET[$this->get_param]));
+				}
+				else
+					$this->extract_query(base64_decode($_GET[$this->get_param]));
+		}
+	}
+	
+	$dsm = new dsm;
+	$dsm->init();