Better control of number of entries per page or RSS feed

https://github.com/FreshRSS/FreshRSS/issues/1249
* Since X hours: `https://freshrss.example/i/?a=rss&hours=3`
* Explicit number: `https://freshrss.example/i/?a=rss&nb=10`
* Limited by `min_posts_per_rss` and `max_posts_per_rss` in user config

7 files changed, 48 insertions, 7 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b3c46bdb6..f82f68fff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@
 ## 2016-XX-XX FreshRSS 1.6.0-dev
 
 * Features
+	* Better control of number of entries per page or RSS feed [#1249](https://github.com/FreshRSS/FreshRSS/issues/1249)
+		* Since X hours: `https://freshrss.example/i/?a=rss&hours=3`
+		* Explicit number: `https://freshrss.example/i/?a=rss&nb=10`
+		* Limited by `min_posts_per_rss` and `max_posts_per_rss` in user config
 	* Support custom ports `localhost:3306` for database servers [#1241](https://github.com/FreshRSS/FreshRSS/issues/1241)
 * Security
 	* Prevent `<a target="_blank">` attacks with `window.opener` [#1245](https://github.com/FreshRSS/FreshRSS/issues/1245)
diff --git a/app/Controllers/indexController.php b/app/Controllers/indexController.php
index 2332d225d..4e2717920 100755
--- a/app/Controllers/indexController.php
+++ b/app/Controllers/indexController.php
@@ -34,7 +34,9 @@ class FreshRSS_index_Controller extends Minz_ActionController {
 
 		$this->view->callbackBeforeContent = function($view) {
 			try {
+				FreshRSS_Context::$number++;	//+1 for pagination
 				$entries = FreshRSS_index_Controller::listEntriesByContext();
+				FreshRSS_Context::$number--;
 
 				$nb_entries = count($entries);
 				if ($nb_entries > FreshRSS_Context::$number) {
@@ -154,6 +156,7 @@ class FreshRSS_index_Controller extends Minz_ActionController {
 	 *   - order (default: conf->sort_order)
 	 *   - nb (default: conf->posts_per_page)
 	 *   - next (default: empty string)
+	 *   - hours (default: 0)
 	 */
 	private function updateContext() {
 		// Update number of read / unread variables.
@@ -180,10 +183,14 @@ class FreshRSS_index_Controller extends Minz_ActionController {
 		FreshRSS_Context::$order = Minz_Request::param(
 			'order', FreshRSS_Context::$user_conf->sort_order
 		);
-		FreshRSS_Context::$number = Minz_Request::param(
-			'nb', FreshRSS_Context::$user_conf->posts_per_page
-		);
+		FreshRSS_Context::$number = intval(Minz_Request::param('nb', FreshRSS_Context::$user_conf->posts_per_page));
+		if (FreshRSS_Context::$number > FreshRSS_Context::$user_conf->max_posts_per_rss) {
+			FreshRSS_Context::$number = max(
+				FreshRSS_Context::$user_conf->max_posts_per_rss,
+				FreshRSS_Context::$user_conf->posts_per_page);
+		}
 		FreshRSS_Context::$first_id = Minz_Request::param('next', '');
+		FreshRSS_Context::$sinceHours = intval(Minz_Request::param('hours', 0));
 	}
 
 	/**
@@ -201,11 +208,31 @@ class FreshRSS_index_Controller extends Minz_ActionController {
 			$id = '';
 		}
 
-		return $entryDAO->listWhere(
+		$limit = FreshRSS_Context::$number;
+
+		$date_min = 0;
+		if (FreshRSS_Context::$sinceHours) {
+			$date_min = time() - (FreshRSS_Context::$sinceHours * 3600);
+			$limit = FreshRSS_Context::$user_conf->max_posts_per_rss;
+		}
+
+		$entries = $entryDAO->listWhere(
 			$type, $id, FreshRSS_Context::$state, FreshRSS_Context::$order,
-			FreshRSS_Context::$number + 1, FreshRSS_Context::$first_id,
-			FreshRSS_Context::$search
+			$limit, FreshRSS_Context::$first_id,
+			FreshRSS_Context::$search, $date_min
 		);
+
+		if (FreshRSS_Context::$sinceHours && (count($entries) < FreshRSS_Context::$user_conf->min_posts_per_rss)) {
+			$date_min = 0;
+			$limit = FreshRSS_Context::$user_conf->min_posts_per_rss;
+			$entries = $entryDAO->listWhere(
+				$type, $id, FreshRSS_Context::$state, FreshRSS_Context::$order,
+				$limit, FreshRSS_Context::$first_id,
+				FreshRSS_Context::$search, $date_min
+			);
+		}
+
+		return $entries;
 	}
 
 	/**
diff --git a/app/Models/Context.php b/app/Models/Context.php
index 2a58bd4ba..33e65a619 100644
--- a/app/Models/Context.php
+++ b/app/Models/Context.php
@@ -35,6 +35,7 @@ class FreshRSS_Context {
 	public static $first_id = '';
 	public static $next_id = '';
 	public static $id_max = '';
+	public static $sinceHours = 0;
 
 	/**
 	 * Initialize the context.
diff --git a/app/layout/layout.phtml b/app/layout/layout.phtml
index 4d9ad5458..1f11e0af1 100644
--- a/app/layout/layout.phtml
+++ b/app/layout/layout.phtml
@@ -42,6 +42,9 @@
 	} if (isset($this->rss_title)) {
 		$url_rss = $url_base;
 		$url_rss['a'] = 'rss';
+		if (FreshRSS_Context::$user_conf->since_hours_posts_per_rss) {
+			$url_rss['params']['hours'] = FreshRSS_Context::$user_conf->since_hours_posts_per_rss;
+		}
 ?>
 		<link rel="alternate" type="application/rss+xml" title="<?php echo $this->rss_title; ?>" href="<?php echo Minz_Url::display($url_rss); ?>" />
 <?php } if (FreshRSS_Context::$system_conf->allow_robots) { ?>
diff --git a/app/layout/nav_menu.phtml b/app/layout/nav_menu.phtml
index d77c1abf9..c02232242 100644
--- a/app/layout/nav_menu.phtml
+++ b/app/layout/nav_menu.phtml
@@ -151,6 +151,9 @@
 			if (FreshRSS_Context::$user_conf->token) {
 				$url_output['params']['token'] = FreshRSS_Context::$user_conf->token;
 			}
+			if (FreshRSS_Context::$user_conf->since_hours_posts_per_rss) {
+				$url_output['params']['hours'] = FreshRSS_Context::$user_conf->since_hours_posts_per_rss;
+			}
 		?>
 		<a class="view_rss btn" target="_blank" rel="noreferrer" title="<?php echo _t('index.menu.rss_view'); ?>" href="<?php echo Minz_Url::display($url_output); ?>">
 			<?php echo _i('rss'); ?>
diff --git a/app/views/auth/index.phtml b/app/views/auth/index.phtml
index 74e692ec5..7195bab5d 100644
--- a/app/views/auth/index.phtml
+++ b/app/views/auth/index.phtml
@@ -60,7 +60,7 @@
 				<input type="text" id="token" name="token" value="<?php echo $token; ?>" placeholder="<?php echo _t('gen.short.blank_to_disable'); ?>"<?php
 					echo FreshRSS_Auth::accessNeedsAction() ? '' : ' disabled="disabled"'; ?> data-leave-validation="<?php echo $token; ?>"/>
 				<?php echo _i('help'); ?> <?php echo _t('admin.auth.token_help'); ?>
-				<kbd><?php echo Minz_Url::display(array('params' => array('output' => 'rss', 'token' => $token)), 'html', true); ?></kbd>
+				<kbd><?php echo Minz_Url::display(array('params' => array('output' => 'rss', 'token' => $token, 'hours' => FreshRSS_Context::$user_conf->since_hours_posts_per_rss)), 'html', true); ?></kbd>
 			</div>
 		</div>
 		<?php } ?>
diff --git a/data/users/_/config.default.php b/data/users/_/config.default.php
index 4a3403453..2c56d5f45 100644
--- a/data/users/_/config.default.php
+++ b/data/users/_/config.default.php
@@ -9,6 +9,9 @@ return array (
 	'passwordHash' => '',
 	'apiPasswordHash' => '',
 	'posts_per_page' => 20,
+	'since_hours_posts_per_rss' => 168,
+	'min_posts_per_rss' => 2,
+	'max_posts_per_rss' => 400,
 	'view_mode' => 'normal',
 	'default_view' => 'adaptive',
 	'default_state' => FreshRSS_Entry::STATE_NOT_READ,