Generate absolute URL with specific scheme in Symfony2 - php

Question

I want to generate an absolute URL with a specific scheme (https) in a Symfony2 controller. All the solutions I found point me to configure the targeted route so that it requires that scheme. But I need the route to remain accessible in http, so I can't set it to require https (in which case http requests are redirected to the corresponding https URL).
Is there a way to generate an URL with, in the scope of that URL generation only, a specific scheme?
I saw that using the 'network' keyword generates a "network path"-style URL, which looks like "//example.com/dir/file"; so maybe I can simply do
'https:' . $this->generateUrl($routeName, $parameters, 'network')
But I don't know if this will be robust enough to any route or request context.
UPDATE: after investigation in the URL generation code, this "network path" workaround seems fully robust. A network path is generated exactly as an absolute URL, without a scheme before the "//".

Answer 1

Best way to go with this
$url = 'https:'.$this->generateUrl($routeName, $parameters, UrlGeneratorInterface::NETWORK_PATH)

Answer 2

According to the code or documentation, currently you cannot do that within the generateUrl method. So your "hackish" solution is still the best, but as #RaymondNijland commented you are better off with str_replace:
$url = str_replace('http:', 'https:', $this->generateUrl($routeName, $parameters));
If you want to make sure it's changed only at the beginning of the string, you can write:
$url = preg_replace('/^http:/', 'https:', $this->generateUrl($routeName, $parameters));
No, the colon (:) has no special meaning in the regex so you don't have to escape it.

Answer 3

With default UrlGenerator, I don't think that is possible, if you don't want to mess with strings.
You could make your own HttpsUrlGenerator extends UrlGenerator introducting one slight change:
Within method generate(), instead of:
return $this->doGenerate(
$compiledRoute->getVariables(),
$route->getDefaults(),
$route->getRequirements(),
$compiledRoute->getTokens(),
$parameters,
$name,
$referenceType,
$compiledRoute->getHostTokens(),
$route->getSchemes()
);
You could do:
return $this->doGenerate(
$compiledRoute->getVariables(),
$route->getDefaults(),
$route->getRequirements(),
$compiledRoute->getTokens(),
$parameters,
$name,
$referenceType,
$compiledRoute->getHostTokens(),
['https']
);
As you can see, $route->getSchemes() gets pumped into doGenerate() based on the route settings (the tutorial link you provided above).
You could even go further and externalize this schema array and supply it via __construct.
Hope this helps a bit ;)