diff --git a/di_config.php b/di_config.php
new file mode 100644
index 0000000..ab7d289
--- /dev/null
+++ b/di_config.php
@@ -0,0 +1,18 @@
+<?php
+
+use Psr\Container\ContainerInterface;
+use SBRL\TomlConfig;
+
+return [
+	"settings.file_default" => "data/settings.toml",
+	"settings.file_custom" => "settings.default.toml",
+	
+	\SBRL\TomlConfig::class => function(ContainerInterface $c) {
+		return new TomlConfig(
+			$c->get("settings.file_default"),
+			$c->get("settings.file_custom")
+		);
+	},
+	
+	\SBRL\SessionManager::class => DI\factory([ \SBRL\SessionManager::class, "get_instance" ])
+];
diff --git a/index.php b/index.php
new file mode 100644
index 0000000..9f0cf30
--- /dev/null
+++ b/index.php
@@ -0,0 +1,59 @@
+<?php
+
+define("ROOT_DIR", dirname(__FILE__) . "/");
+
+// 1: Autoloaders
+
+require("vendor/autoload.php");
+
+$autoloader = new \Aura\Autoload\Loader();
+$autoloader->addPrefix("AirQuality", "logic");
+$autoloader->addPrefix("SBRL", "lib/SBRL");
+$autoloader->register();
+
+
+// 2: Dependency injection
+
+$di_builder = new DI\ContainerBuilder();
+$di_builder->addDefinitions("di_config.php");
+
+$di_container = $di_builder->build();
+
+
+// 3: Settings
+
+$settings = $di_container->get(\SBRL\TomlConfig::class);
+
+
+// 4: Database
+
+// TODO: Setup the database here
+
+
+// 5: Action
+
+// Figure out the action name
+$action = str_replace(
+	" ", "",
+	ucwords(str_replace(
+		"-", " ",
+		preg_replace("/[^a-z-]/i", "", $_GET["action"] ?? $settings->get("routing.default-action"))
+	))
+);
+
+$handler_name = "AirQuality\\Actions\\$action";
+
+// if(!class_exists($handler_name))
+//         send_error(404, "Unknown action $handler_name.");
+
+// Fetch it from the dependency injector and execute it, but only if it exists
+
+if(!class_exists($handler_name)) {
+	http_response_code(404);
+	header("content-type: text/plain");
+	exit("Error: No action with the name '$action' could be found.");
+}
+
+// FUTURE: A PSR-7 request/response system would be rather nice here.
+$handler = $di_container->get($handler_name);
+$handler->handle();
diff --git a/lib/SBRL/Generators.php b/lib/SBRL/Generators.php
new file mode 100644
index 0000000..195dfa3
--- /dev/null
+++ b/lib/SBRL/Generators.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace SBRL;
+
+class Generators {
+	
+	public static function crypto_secure_id(int $length = 64) { // 64 = 32
+        $length = ($length < 4) ? 4 : $length;
+        return bin2hex(random_bytes(($length-($length%2))/2));
+    }
+	
+	
+}
diff --git a/lib/SBRL/TomlConfig.php b/lib/SBRL/TomlConfig.php
new file mode 100644
index 0000000..b0d479c
--- /dev/null
+++ b/lib/SBRL/TomlConfig.php
@@ -0,0 +1,202 @@
+<?php 
+
+namespace SBRL;
+
+use \stdClass;
+use \Yosymfony\Toml\Toml;
+use \Yosymfony\Toml\TomlBuilder;
+
+/**
+ * Handles the loading and saving of settings from a toml file.
+ * Supports loading default settings from a separate file.
+ * @author			Starbeamrainbowlabs
+ * @version			v0.5
+ * @lastModified	22nd March 2017
+ * @license			https://www.mozilla.org/en-US/MPL/2.0/	Mozilla Public License 2.0
+ * Changelog:
+ 	 * v0.5 - 9th September 2018
+ 	 	 * Made hasPropertyByPath() more intelligent
+ 	 * v0.4 - 23rd August 2018
+ 	 	 * Made getPropertyByPath() more intelligent
+	 * v0.3 - 5th March 2018
+		 * Forked to create a version for toml.
+	 * v0.2 - 22nd March 2017
+		 * Add license
+		 * Filled in some missing comments
+	 * v0.1: 28th February 2017
+		 * Initial release
+ */
+class TomlConfig
+{
+	private $defaultSettings;
+	
+	private $settingsFilePath = "";
+	/**
+	 * The custom settings object.
+	 * @var stdClass
+	 */
+	private $customSettings;
+	
+	/**
+	 * The banner to insert at the top of the custom settings file when saving it.
+	 * @var string
+	 */
+	private $customSettingsBanner;
+	
+	/**
+	 * Creates a new JsonConfig
+	 * @param string $settingsFilePath			The path to the customised settings file.
+	 * @param string $defaultSettingsFilePath	The path to the default settings file.
+	 */
+	public function __construct($settingsFilePath, $defaultSettingsFilePath) {
+		$this->customSettingsBanner = "-------[ Custom Settings File - Last updated " . date("Y-m-d") . " ]-------";
+		
+		$this->defaultSettings = Toml::ParseFile($defaultSettingsFilePath, true);
+		
+		$this->customSettings = new stdClass();
+		if(file_exists($settingsFilePath)) {
+			$this->customSettings = Toml::ParseFile($settingsFilePath, true);
+		} else {
+			mkdir(dirname($settingsFilePath), 0750, true);
+			file_put_contents($settingsFilePath, "$this->customSettingsBanner\n");
+		}
+	}
+	/**
+	 * Gets the value identified by the specified property, in dotted notation (e.g. `Network.Firewalling.Ports.Http`)
+	 * @param	string	$key	The property, in dotted notation, to return.
+	 * @return	mixed			The value odentified by the given dotted property notation.
+	 */
+	public function get($key) {
+		if(static::hasPropertyByPath($this->customSettings, $key)) {
+			return static::getPropertyByPath($this->customSettings, $key);
+		}
+		return static::getPropertyByPath($this->defaultSettings, $key);
+	}
+	/**
+	 * Fetches the default value for the specified property, specified in dotted notation.
+	 * @param  string	$key	The key to fetch.
+	 * @return mixed	The default value of the property identified by the given dotted notation.
+	 */
+	public function getDefault($key) {
+		return static::getPropertyByPath($this->defaultSettings, $key);
+	}
+	/**
+	 * Determines whether the given property has been customised or explicitly specified in the customised settings file.
+	 * @param	string	$key	The property, in dotted notation, to check.
+	 * @return	boolean			Whether the specified properties file has been explicitly specified in the custom settings file.
+	 */
+	public function hasChanged($key) {
+		return static::hasPropertyByPath($this->customSettings, $key);
+	}
+	/**
+	 * Sets the property identified by the specified dotted path.
+	 * Does not re-save the properties back to disk!
+	 * @param	string	$key	The dotted path to update.
+	 * @param	mixed	$value	The value to set the property to.
+	 * @return	self			This ConfigFile instance, to aid method chaining.
+	 */
+	public function set($key, $value) {
+		static::setPropertyByPath($this->customSettings, $key, $value);
+		return $this;
+	}
+	
+	public function setCustomSettingsBanner($value) {
+		$this->customSettingsBanner = $value;
+		return $this;
+	}
+	
+	/**
+	 * Saves the customised settings back to the disk.
+	 * @return boolean Whether the save was successful or not.
+	 */
+	public function save() {
+		$output_builder = new TomlBuilder();
+		$toml_builder->addComment($this->customSettingsBanner);
+		
+		$this->build($toml_builder, $this->customSettings);
+		
+		return file_put_contents($settingsFilePath, $toml_builder->getTomlString());
+	}
+	
+	private function build($toml_builder, $customSettingsObject, $subobject_name = null) {
+		if($subobject_name !== null)
+			$toml_builder->addTable($subobject_name);
+		
+		foreach($customSettingsObject as $key => $value) {
+			if(!\is_object($value))
+				$toml_builder->addValue($key, $value);
+			else
+				$this->build($toml_builder, $value, "$subobject_name.$key");
+		}
+	}
+	
+	/**
+	 * Works out whether a given dotted path to a property exists on a given object.
+	 * @param	stdClass  	$obj	The object to search.
+	 * @param	string		$path	The dotted path to search with. e.g. `Network.Firewall.OpenPorts`
+	 * @return	boolean		Whether the given property is present in the given object.
+	 */
+	public static function hasPropertyByPath($obj, $path) {
+		$pathParts = explode(".", $path);
+		$subObj = $obj;
+		foreach($pathParts as $part) {
+			if(is_object($subObj) && !isset($subObj->$part))
+				return false;
+			else if(is_array($subObj) && !isset($subObj[$part]))
+				return false;
+			else if(!is_object($subObj) && !is_array($subObj))
+				return false;
+			
+			if(is_object($subObj))
+				$subObj = $subObj->$part;
+			else // It must be an array
+				$subObj = $subObj[$part];
+		}
+		return true;
+	}
+	/**
+	 * Returns the property identified by the given dotted path.
+	 * If you're not sure whether a property exists or not, use static::hasPropertyByPath() first to check.
+	 * @param	stdClass	$obj	The object to fetch from.
+	 * @param	string		$path	The path to extract from the given object.
+	 * @return	mixed				The property identified by the given object.
+	 */
+	public static function getPropertyByPath($obj, $path) {
+		$pathParts = explode(".", $path);
+		$subObj = $obj;
+		foreach($pathParts as $part) {
+			if(is_object($subObj))
+				$subObj = $subObj->$part;
+			else if(is_array($subObj))
+				$subObj = $subObj[$part];
+			else
+				throw new Exception("Error: Can't find part '$part' on sub-item if it isn't an object or array");
+		}
+		return $subObj;
+	}
+	/**
+	 * Returns the property identified by the given dotted path.
+	 * If you're not sure whether a property exists or not, use static::hasPropertyByPath() first to check.
+	 * @param	stdClass	$obj	The object to set the property on.
+	 * @param	string		$path	The path to set on the given object.
+	 * @param	mixed		$value	The value to  set the given property to.
+	 */
+	public static function setPropertyByPath($obj, $path, $value) {
+		$pathParts = explode(".", $path);
+		$pathPartsCount = count($pathParts);
+		
+		$subObj = $obj;
+		for($i = 0; $i < $pathPartsCount; $i++) {
+			// Set the property on the last iteration
+			if($i + 1 == $pathPartsCount) {
+				$subObj->$part = $value;
+				break;
+			}
+			// Create sub-objects if they dobn't exist already
+			if(!isset($subObj->$part)) {
+				$subObj->$part = new stdClass();
+			}
+			$subObj = $subObj->$part;
+		}
+	}
+}
diff --git a/logic/Actions/FetchData.php b/logic/Actions/FetchData.php
new file mode 100644
index 0000000..b293e3b
--- /dev/null
+++ b/logic/Actions/FetchData.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace AirQuality\Actions;
+
+
+class Index {
+	private $settings;
+	private $renderer;
+	
+	public function __construct(
+		\SBRL\TomlConfig $in_settings) {
+		$this->settings = $in_settings;
+		$this->renderer = $in_renderer;
+	}
+	
+	public function handle() {
+		echo($this->renderer->render_file(ROOT_DIR."templates/main.html", [
+			"title" => "Home",
+			"content" => file_get_contents(ROOT_DIR."templates/mockup.html"),
+			"footer_html" => ""
+		]));
+	}
+}
diff --git a/logic/Validator.php b/logic/Validator.php
new file mode 100644
index 0000000..9b0a047
--- /dev/null
+++ b/logic/Validator.php
@@ -0,0 +1,111 @@
+<?php
+namespace AirQuality;
+
+
+
+class Validator {
+	private $target_data;
+	private $tests = [];
+	
+	public function __construct($in_target_data) {
+		$this->target_data = $in_target_data;
+	}
+	
+	public function exists($key) {
+		$this->add_test(
+			$key,
+			function($data) { return isset($data); },
+			400,
+			"Error: The field $key wasn't found in your request."
+		);
+	}
+	
+	public function is_numberish($key) {
+		$this->add_test(
+			$key,
+			function($data) { return is_numeric($data); },
+			400,
+			"Error: The field $key in your request isn't a number."
+		);
+	}
+	public function is_min_length($key, $min_length) {
+		$this->add_test(
+			$key,
+			function($data) use ($min_length) { return mb_strlen($data) >= $min_length; },
+			400,
+			"Error: The field $key is too short - it must be a minimum of $min_length characters."
+		);
+	}
+	public function is_max_length($key, $max_length) {
+		$this->add_test(
+			$key,
+			function($data) use ($max_length) { return mb_strlen($data) <= $max_length; },
+			400,
+			"Error: The field $key is too long - it must be a maximum of $max_length characters."
+		);
+	}
+	
+	public function are_equal($key_a, $key_b, $message) {
+		$key_b_data = $this->target_data[$key_b];
+		$this->add_test(
+			$key_a,
+			function($data) use($key_b_data) {
+				return $data === $key_b_data;
+			},
+			400,
+			$message
+		);
+	}
+	
+	public function matches_regex($key, $regex, $message) {
+		$this->add_test(
+			$key,
+			function($data) use($regex) {
+				return preg_match($regex, $data) === 1;
+			},
+			400,
+			$message
+		);
+	}
+	
+	public function is_valid_email($key) {
+		$this->add_test(
+			$key,
+			function($data) {
+				$validator = new \EmailValidator\Validator();
+				return $validator->isValid($data);
+			},
+			400,
+			"That email address isn't valid."
+		);
+	}
+	
+	public function add_test($key, $test, $response_code, $message) {
+		$new_test = [
+			"key" => $key,
+			"test" => $test,
+			"response_code" => $response_code,
+			"message" => $message
+		];
+		
+		$this->tests[] = $new_test;
+	}
+	
+	protected function send_error($code, $message) {
+		http_response_code($code);
+		header("content-type: text/plain");
+		exit($message);
+	}
+	
+	public function run() {
+		foreach($this->tests as $test) {
+			
+			if(!isset($this->target_data[$test["key"]]) || !$test["test"]($this->target_data[$test["key"]])) {
+				$this->send_error($test["response_code"], $test["message"]);
+			}
+			
+		}
+	}
+	
+	
+}
diff --git a/settings.default.toml b/settings.default.toml
new file mode 100644
index 0000000..695c187
--- /dev/null
+++ b/settings.default.toml
@@ -0,0 +1,17 @@
+# This file defines the default configuration settings.
+##### DO NOT EDIT THIS FILE. #####
+# Your changes may be overwritten in a future update.
+# Instead, edit the custom configuration file located at "data/settings.toml".
+
+[database]
+# Settings that control the database, or the connection to it
+
+type = mysql # MariaDB. MySQL servers might work too, but no promises.
+username = "user"
+password = "Define_in_custom_config_file"
+
+[routing]
+# Settings that control the router's behaviour
+
+# The default action to take if no action is specified
+default-action = fetch-data