dfstorm
/
small-memory
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init'ish

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dfstorm 2 years ago
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  1. 48
      README.md
  2. 1
      api_keys.json.exemple
  3. 260
      index.php

48
README.md
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@ -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"})
```

1
api_keys.json.exemple
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{"keys":["example_A","example_B"]}

260
index.php
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<?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();
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