New project structure

Beta of extract.js for extracting english locale

server/lib/privilege-helpers.js

@@ -0,0 +1,77 @@
+'use strict';
+
+const log = require('./log');
+const config = require('config');
+
+const fs = require('fs');
+
+const tryRequire = require('try-require');
+const posix = tryRequire('posix');
+
+function _getConfigUidGid(userKey, groupKey, defaultUid, defaultGid) {
+    let uid = defaultUid;
+    let gid = defaultGid;
+
+    if (posix) {
+        try {
+            if (config[userKey]) {
+                uid = posix.getpwnam(config[userKey]).uid;
+            }
+        } catch (err) {
+            log.info('PrivilegeHelpers', 'Failed to resolve user id "%s"', config[userKey]);
+        }
+
+        try {
+            if (config[groupKey]) {
+                gid = posix.getpwnam(config[groupKey]).gid;
+            }
+        } catch (err) {
+            log.info('PrivilegeHelpers', 'Failed to resolve group id "%s"', config[groupKey]);
+        }
+    } else {
+        log.info('PrivilegeHelpers', 'Posix module not installed. Cannot resolve uid/gid');
+    }
+
+    return { uid, gid };
+}
+
+function getConfigUidGid() {
+    return _getConfigUidGid('user', 'group', process.getuid(), process.getgid());
+}
+
+function getConfigROUidGid() {
+    const rwIds = getConfigUidGid();
+    return _getConfigUidGid('roUser', 'roGroup', rwIds.uid, rwIds.gid);
+}
+
+function ensureMailtrainOwner(file, callback) {
+    const ids = getConfigUidGid();
+    fs.chown(file, ids.uid, ids.gid, callback);
+}
+
+function dropRootPrivileges() {
+    if (config.group) {
+        try {
+            process.setgid(config.group);
+            log.info('PrivilegeHelpers', 'Changed group to "%s" (%s)', config.group, process.getgid());
+        } catch (E) {
+            log.info('PrivilegeHelpers', 'Failed to change group to "%s" (%s)', config.group, E.message);
+        }
+    }
+
+    if (config.user) {
+        try {
+            process.setuid(config.user);
+            log.info('PrivilegeHelpers', 'Changed user to "%s" (%s)', config.user, process.getuid());
+        } catch (E) {
+            log.info('PrivilegeHelpers', 'Failed to change user to "%s" (%s)', config.user, E.message);
+        }
+    }
+}
+
+module.exports = {
+    dropRootPrivileges,
+    ensureMailtrainOwner,
+    getConfigUidGid,
+    getConfigROUidGid
+};