Rework permission handling

Add a new function has_credential() that checks whether the currently
logged in user is allowed to perform a given action. Moving all
permission handling to this central place makes adding new user groups
and adjusting permissions much more convenient.

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

1 files changed, 76 insertions, 0 deletions

diff --git a/web/lib/credentials.inc.php b/web/lib/credentials.inc.php
new file mode 100644
index 0000000..22068e4
--- /dev/null
+++ b/web/lib/credentials.inc.php
@@ -0,0 +1,76 @@
+<?php
+include_once("config.inc.php");
+
+define("CRED_ACCOUNT_CHANGE_TYPE", 1);
+define("CRED_ACCOUNT_EDIT", 2);
+define("CRED_ACCOUNT_EDIT_DEV", 3);
+define("CRED_ACCOUNT_LAST_LOGIN", 4);
+define("CRED_ACCOUNT_SEARCH", 5);
+define("CRED_COMMENT_DELETE", 6);
+define("CRED_PKGBASE_ADOPT", 7);
+define("CRED_PKGBASE_CHANGE_CATEGORY", 8);
+define("CRED_PKGBASE_DELETE", 9);
+define("CRED_PKGBASE_DISOWN", 10);
+define("CRED_PKGBASE_FLAG", 11);
+define("CRED_PKGBASE_LIST_VOTERS", 12);
+define("CRED_PKGBASE_NOTIFY", 13);
+define("CRED_PKGBASE_SUBMIT_BLACKLISTED", 14);
+define("CRED_PKGBASE_UNFLAG", 15);
+define("CRED_PKGBASE_VOTE", 16);
+define("CRED_PKGREQ_CLOSE", 17);
+define("CRED_PKGREQ_LIST", 18);
+define("CRED_TU_ADD_VOTE", 19);
+define("CRED_TU_LIST_VOTES", 20);
+define("CRED_TU_VOTE", 21);
+
+/**
+ * Determine if a user has the permission to perform a given action
+ *
+ * @param int $credential The type of action to peform
+ * @param array $approved_users A user whitelist for this query
+ *
+ * @return bool Return true if the user has the permission, false if not
+ */
+function has_credential($credential, $approved_users=array()) {
+	if (!isset($_COOKIE['AURSID'])) {
+		return false;
+	}
+
+	$uid = uid_from_sid($_COOKIE['AURSID']);
+	if (in_array($uid, $approved_users)) {
+		return true;
+	}
+
+	$atype = account_from_sid($_COOKIE['AURSID']);
+
+	switch ($credential) {
+	case CRED_PKGBASE_FLAG:
+	case CRED_PKGBASE_NOTIFY:
+	case CRED_PKGBASE_VOTE:
+		return ($atype == 'User' || $atype == 'Trusted User' ||
+			$atype == 'Developer');
+	case CRED_ACCOUNT_CHANGE_TYPE:
+	case CRED_ACCOUNT_EDIT:
+	case CRED_ACCOUNT_LAST_LOGIN:
+	case CRED_ACCOUNT_SEARCH:
+	case CRED_COMMENT_DELETE:
+	case CRED_PKGBASE_ADOPT:
+	case CRED_PKGBASE_CHANGE_CATEGORY:
+	case CRED_PKGBASE_DELETE:
+	case CRED_PKGBASE_DISOWN:
+	case CRED_PKGBASE_LIST_VOTERS:
+	case CRED_PKGBASE_SUBMIT_BLACKLISTED:
+	case CRED_PKGBASE_UNFLAG:
+	case CRED_PKGREQ_CLOSE:
+	case CRED_PKGREQ_LIST:
+		return ($atype == 'Trusted User' || $atype == 'Developer');
+	case CRED_TU_ADD_VOTE:
+	case CRED_TU_LIST_VOTES:
+	case CRED_TU_VOTE:
+		return ($atype == 'Trusted User');
+	case CRED_ACCOUNT_EDIT_DEV:
+		return ($atype == 'Developer');
+	}
+
+	return false;
+}