1 files changed, 54 insertions, 0 deletions
diff --git a/includes/libs/composer/ComposerJson.php b/includes/libs/composer/ComposerJson.php
new file mode 100644
index 00000000..796acb56
--- /dev/null
+++ b/includes/libs/composer/ComposerJson.php
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * Reads a composer.json file and provides accessors to get
+ * its hash and the required dependencies
+ *
+ * @since 1.25
+ */
+class ComposerJson {
+
+	/**
+	 * @param string $location
+	 */
+	public function __construct( $location ) {
+		$this->hash = md5_file( $location );
+		$this->contents = json_decode( file_get_contents( $location ), true );
+	}
+
+	public function getHash() {
+		return $this->hash;
+	}
+
+	/**
+	 * Dependencies as specified by composer.json
+	 *
+	 * @return array
+	 */
+	public function getRequiredDependencies() {
+		$deps = array();
+		foreach ( $this->contents['require'] as $package => $version ) {
+			if ( $package !== "php" && strpos( $package, 'ext-' ) !== 0 ) {
+				$deps[$package] = self::normalizeVersion( $version );
+			}
+		}
+
+		return $deps;
+	}
+
+	/**
+	 * Strip a leading "v" from the version name
+	 *
+	 * @param string $version
+	 * @return string
+	 */
+	public static function normalizeVersion( $version ) {
+		if ( strpos( $version, 'v' ) === 0 ) {
+			// Composer auto-strips the "v" in front of the tag name
+			$version = ltrim( $version, 'v' );
+		}
+
+		return $version;
+	}
+
+}