Enable pre-releases for beta and daily channel

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/private/App/AppStore/Fetcher/AppFetcher.php

@@ -83,14 +83,17 @@ class AppFetcher extends Fetcher {
 		/** @var mixed[] $response */
 		$response = parent::fetch($ETag, $content);
 
+		$allowPreReleases = $this->getChannel() === 'beta' || $this->getChannel() === 'daily';
+		$allowNightly = $this->getChannel() === 'daily';
+
 		foreach($response['data'] as $dataKey => $app) {
 			$releases = [];
 
 			// Filter all compatible releases
 			foreach($app['releases'] as $release) {
-				// Exclude all nightly and pre-releases
-				if($release['isNightly'] === false
-					&& strpos($release['version'], '-') === false) {
+				// Exclude all nightly and pre-releases if required
+				if (($allowNightly || $release['isNightly'] === false)
+					&& ($allowPreReleases || strpos($release['version'], '-') === false)) {
 					// Exclude all versions not compatible with the current version
 					try {
 						$versionParser = new VersionParser();

lib/private/App/AppStore/Fetcher/Fetcher.php

@@ -57,6 +57,8 @@ abstract class Fetcher {
 	protected $endpointUrl;
 	/** @var string */
 	protected $version;
+	/** @var string */
+	protected $channel;
 
 	/**
 	 * @param Factory $appDataFactory
@@ -197,4 +199,23 @@ abstract class Fetcher {
 	public function setVersion(string $version) {
 		$this->version = $version;
 	}
+
+	/**
+	 * Get the currently Nextcloud update channel
+	 * @return string
+	 */
+	protected function getChannel() {
+		if ($this->channel === null) {
+			$this->channel = \OC_Util::getChannel();
+		}
+		return $this->channel;
+	}
+
+	/**
+	 * Set the current Nextcloud update channel
+	 * @param string $channel
+	 */
+	public function setChannel(string $channel) {
+		$this->channel = $channel;
+	}
 }