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route method regex explained #2

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route method regex explained
Lucas-lufa Sep 10, 2024
7d852fa
start session 3:27:00
Lucas-lufa Sep 10, 2024
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98 changes: 57 additions & 41 deletions session-07/S07-Vanilla-PHP-MVC-Pt-03.md
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Original file line number Diff line number Diff line change
Expand Up @@ -372,13 +372,15 @@ Yep, a lot is done by this one method.
Here are the parts of the method with quick descriptions...

```php
$requestMethod = $_SERVER['REQUEST_METHOD'];

// Check for _method input
if ($requestMethod === 'POST' && isset($_POST['_method'])) {
// Override the request method with the value of _method
$requestMethod = strtoupper($_POST['_method']);
}
public function route($uri)
{
$requestMethod = $_SERVER['REQUEST_METHOD'];

// Check for _method input
if ($requestMethod === 'POST' && isset($_POST['_method'])) {
// Override the request method with the value of _method
$requestMethod = strtoupper($_POST['_method']);
}
```

Here we get the request (HTTP) method that is being used (GET, POST).
Expand All @@ -399,34 +401,43 @@ foreach ($this->routes as $route) {
$routeSegments = explode('/', trim($route['uri'], '/'));

$match = true;
```

Next we need to go through the registered routes one by one.
// Constructor for Database class
// Next we need to go through the registered routes one by one.

We explode the incoming request URI into segments. This is ready for matching.
// We explode the incoming request URI into segments. This is ready for matching.

We do the same for the URI of the current registered route.
// We do the same for the URI of the current registered route.

We then set a default value for match completion, so we only need to change this when no match is found.
// We then set a default value for match completion, so we only need to change this when no match is found.

The next part is where we check the segments of the request against the segments of the registered route...

```php
if (count($uriSegments) === count($routeSegments) && strtoupper($route['method'] === $requestMethod)) {
$params = [];

$match = true;
$segments = count($uriSegments);
for ($i = 0; $i < $segments; $i++) {

if ($routeSegments[$i] !== $uriSegments[$i] && !preg_match('/\{(.+?)}/', $routeSegments[$i])) {
$match = false;
break;
}
// The next part is where we check the segments of the request against the segments of the registered route...

if (count($uriSegments) === count($routeSegments)
&& strtoupper($route['method'] === $requestMethod)) {
$params = [];

if (preg_match('/\{(.+?)}/', $routeSegments[$i], $matches)) {
$params[$matches[1]] = $uriSegments[$i];
}
$match = true;
$segments = count($uriSegments);

for ($i = 0; $i < $segments; $i++) {
// If the uri's do not match and there is no parm
if ($routeSegments[$i] !== $uriSegments[$i]
// /is the start and end of regex pattern
// \escapes the curly brace, making it a regular character, it's looking for it.
// parenthesis is the capturing group
// . is any character that is not a newline
// + is one or more proceeding elements
// ? lazy making match as few of the preceding characters as possible
// eg /products/{id}
&& !preg_match('/\{(.+?)}/', $routeSegments[$i])) {
$match = false;
break;
}

if (preg_match('/\{(.+?)}/', $routeSegments[$i], $matches)) {
$params[$matches[1]] = $uriSegments[$i];
}
}
```

Expand All @@ -444,19 +455,23 @@ If the previous decision is false we then check and add the parameter to the par
We are now ready to process the middleware component of the route, if required...

```php
if ($match) {
foreach ($route['Middleware'] as $middleware) {
(new Authorise())->handle($middleware);
}

$controller = 'App\\controllers\\' . $route['controller'];
$controllerMethod = $route['controllerMethod'];

// Instantiate the controller and call the method
$controllerInstance = new $controller();
$controllerInstance->$controllerMethod($params);
return;
if ($match) {
foreach ($route['Middleware'] as $middleware) {
(new Authorise())->handle($middleware);
}

$controller = 'App\\controllers\\' . $route['controller'];
$controllerMethod = $route['controllerMethod'];

// Instantiate the controller and call the method
$controllerInstance = new $controller();
$controllerInstance->$controllerMethod($params);
return;
}
}
}

ErrorController::notFound();
```

If we get to this block of code and the `match` is still true we are able to process the middleware requirements.
Expand All @@ -478,6 +493,7 @@ You are expected to update the header comments to give a title and explain the p

## Session

3:27:00
Use the same technique as previously to create a new class in the Framework folder, this time called Session.

Fill out the header DocBlock as required.
Expand Down