Add API endpoint for extensions (#7576)

* Add API endpoint for extensions
Useful for https://github.com/FreshRSS/FreshRSS/issues/7572

* Support PATH_INFO
Now also support being invoked like `/api/misc.php/Extension%20Name/`

* More  documentation

4 files changed, 6 insertions, 2 deletions

diff --git a/docs/en/admins/10_ServerConfig.md b/docs/en/admins/10_ServerConfig.md
index b7f57e61a..07ea147b6 100644
--- a/docs/en/admins/10_ServerConfig.md
+++ b/docs/en/admins/10_ServerConfig.md
@@ -98,7 +98,7 @@ server {
 		fastcgi_pass unix:/var/run/php/php8.1-fpm.sock;
 		fastcgi_split_path_info ^(.+\.php)(/.*)$;
 		# By default, the variable PATH_INFO is not set under PHP-FPM
-		# But FreshRSS API greader.php need it. If you have a “Bad Request” error, double check this var!
+		# But FreshRSS APIs greader.php and misc.php need it. If you have a “Bad Request” error, double check this var!
 		# NOTE: the separate $path_info variable is required. For more details, see:
 		# https://trac.nginx.org/nginx/ticket/321
 		set $path_info $fastcgi_path_info;
diff --git a/docs/en/developers/03_Backend/05_Extensions.md b/docs/en/developers/03_Backend/05_Extensions.md
index aeb693cba..db9b03d60 100644
--- a/docs/en/developers/03_Backend/05_Extensions.md
+++ b/docs/en/developers/03_Backend/05_Extensions.md
@@ -164,6 +164,8 @@ final class HelloWorldExtension extends Minz_Extension
 
 The following events are available:
 
+* `api_misc` (`function(): void`): to allow extensions to have own API endpoint
+	on `/api/misc.php/Extension%20Name/` or `/api/misc.php?ext=Extension%20Name`.
 * `check_url_before_add` (`function($url) -> Url | null`): will be executed every time a URL is added. The URL itself will be passed as parameter. This way a website known to have feeds which doesn’t advertise it in the header can still be automatically supported.
 * `entry_auto_read` (`function(FreshRSS_Entry $entry, string $why): void`): Triggered when an entry is automatically marked as read. The *why* parameter supports the rules {`filter`, `upon_reception`, `same_title_in_feed`}.
 * `entry_auto_unread` (`function(FreshRSS_Entry $entry, string $why): void`): Triggered when an entry is automatically marked as unread. The *why* parameter supports the rules {`updated_article`}.
diff --git a/docs/fr/developers/03_Backend/05_Extensions.md b/docs/fr/developers/03_Backend/05_Extensions.md
index 728d5c843..6996cee58 100644
--- a/docs/fr/developers/03_Backend/05_Extensions.md
+++ b/docs/fr/developers/03_Backend/05_Extensions.md
@@ -218,6 +218,8 @@ final class HelloWorldExtension extends Minz_Extension
 
 The following events are available:
 
+* `api_misc` (`function(): void`) : permet aux extensions d’avoir leur propre point d’accès API
+	sur `/api/misc.php/Nom%20Extension/` ou `/api/misc.php?ext=Nom%20Extension`.
 * `check_url_before_add` (`function($url) -> Url | null`): will be executed
 	every time a URL is added. The URL itself will be passed as
 	parameter. This way a website known to have feeds which doesn’t advertise
diff --git a/docs/fr/users/01_Installation.md b/docs/fr/users/01_Installation.md
index 85b75fea5..8236776fd 100644
--- a/docs/fr/users/01_Installation.md
+++ b/docs/fr/users/01_Installation.md
@@ -118,7 +118,7 @@ server {
 		fastcgi_pass unix:/var/run/php/php8.1-fpm.sock;
 		fastcgi_split_path_info ^(.+\.php)(/.*)$;
 		# Par défaut la variable PATH_INFO n’est pas définie sous PHP-FPM
-		# or l’API FreshRSS greader.php en a besoin. Si vous avez un “Bad Request”, vérifiez bien cette dernière !
+		# mais les APIs FreshRSS greader.php et misc.php en ont besoin. Si vous avez un “Bad Request”, vérifiez bien cette dernière !
 		# REMARQUE : l’utilisation de la variable $path_info est requis. Pour plus de détails, voir :
 		# https://trac.nginx.org/nginx/ticket/321
 		set $path_info $fastcgi_path_info;