141 行
4.7 KiB
PHP
141 行
4.7 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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class API extends CI_Controller {
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// Do absolutely nothing
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function index()
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{
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//load the model and get results
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$this->load->model('logbook_model');
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$data['data'] = array();
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// load the view
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//$this->load->view('layout/header');
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$this->load->view('api/index', $data);
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//$this->load->view('layout/footer');
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}
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// FUNCTION: search()
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// Handle search requests
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/*
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Okay, so here's how it works in a nutshell...
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*******************************************************************
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Because this is effectively just a filter between the query string
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and a MySQL statement, if done wrong we're just asking for pain.
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DO NOT alter any of the filtering statements without fully
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understanding what you're doing. CodeIgniter provides some
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protection against unwanted characters in the query string, but
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this should in no way be relied upon for safety.
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*******************************************************************
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Example query:-
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.../search/query[Call~M0*(and)(Locator~I*(or)Locator~J*)]/limit[10]/fields[distinct(Call),Locator]/order[Call(asc)]
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There's four parts to this query, separated with forward slashes. It's effectively a heavily-sanitised
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MySQL query, hence the hideous search and replace code blocks below.
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FIELDS
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------
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Straightforward - input is sanitised and passed on - in the example, this ends up as "DISTINCT (Call),Locator",
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which is then the first argument to 'SELECT'
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QUERY
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-----
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This forms the 'WHERE' clause.
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* '(and)' and '(or)' are expanded out to ' AND ' and ' OR '
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* Parentheses are preserved
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* '~' is expanded out to ' LIKE '
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* '*' is translated to '%'
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* Values are encapsulated in quote marks
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So in the example, this translates to "WHERE Call LIKE 'M0%' AND (Locator LIKE 'I%' OR Locator LIKE 'J%')"
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ORDER
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-----
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Sanitised, so our example ends up as "ORDER BY Call ASC".
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LIMIT
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-----
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Straightforward - what's between the square brackets is passed as an argument to 'LIMIT'
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Finally, once this has been done, each field name is translated to the MySQL column name.
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*/
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function search()
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{
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// Load the API and Logbook models
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$this->load->model('api_model');
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$this->load->model('logbook_model');
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// Retrieve the arguments from the query string
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$arguments = $this->_retrieve();
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// Call the parser within the API model to build the query
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$query = $this->api_model->parse($arguments);
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// Execute the query, and retrieve the results
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$s = $this->logbook_model->api_search_query($query);
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$results = $s['results'];
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// Cycle through the results, and translate between MySQL column names
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// and more friendly, descriptive names
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$a = 0;
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if($results->num_rows != 0)
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{
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foreach ($results->result() as $row) {
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$record = (array)$row;
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$r[$a]['rid'] = $a;
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while (list($key, $val) = each($record)) {
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$r[$a][$this->api_model->name($key)] = $val;
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}
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$a++;
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}
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// Add the result record to the main results array
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$data['data']['search_Result']['results'] = $r;
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}
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else
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{
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// We've got no results, so make this empty for completeness
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$data['data']['search_Result']['results'] = "";
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}
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// Add some debugging information to the XML output
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$data['data']['queryInfo']['call'] = "search";
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$data['data']['queryInfo']['dbQuery'] = $s['query'];
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$data['data']['queryInfo']['numResults'] = $a;
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$data['data']['queryInfo']['executionTime'] = $s['time'];
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// Load the XML output view
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$this->load->view('api/index', $data);
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}
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// FUNCTION: _retrieve()
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// Pull the search query arguments from the query string
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private function _retrieve()
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{
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// This whole function could probably have been done in one line... if this was Perl.
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$arguments = array();
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// Retrieve each arguments
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$query = preg_grep("/^query\[(.*)\]$/", $this->uri->segments);
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$limit = preg_grep("/^limit\[(.*)\]$/", $this->uri->segments);
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$order = preg_grep("/^order\[(.*)\]$/", $this->uri->segments);
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$fields = preg_grep("/^fields\[(.*)\]$/", $this->uri->segments);
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// Strip each argument
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$arguments['query'] = substr(array_pop($query), 6);
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$arguments['query'] = substr($arguments['query'], 0, strlen($arguments['query']) - 1);
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$arguments['limit'] = substr(array_pop($limit), 6);
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$arguments['limit'] = substr($arguments['limit'], 0, strlen($arguments['limit']) - 1);
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$arguments['order'] = substr(array_pop($order), 6);
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$arguments['order'] = substr($arguments['order'], 0, strlen($arguments['order']) - 1);
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$arguments['fields'] = substr(array_pop($fields), 7);
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$arguments['fields'] = substr($arguments['fields'], 0, strlen($arguments['fields']) - 1);
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// Return the arguments
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return $arguments;
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}
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}
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