CLDSRV-227: support dmf location type

lib/Config.js

@@ -191,9 +191,39 @@ function hdClientLocationConstraintAssert(configHd) {
     return hdclientFields;
 }
 
+function dmfLocationConstraintAssert(location, locationObj) {
+    const { isCold } = locationObj;
+    const {
+        endpoint,
+        password,
+        username,
+        repoId,
+        nsId,
+    } = locationObj.details;
+
+    assert(isCold === true, 'bad config: invalid isCold setting for dmf type');
+    assert(repoId.length > 0, 'bad config: empty repoId');
+    assert(Array.isArray(repoId)
+        && repoId.every(id => typeof id === 'string'),
+        'bad config: repoId must be an array of strings');
+
+    const stringFields = {
+        endpoint,
+        password,
+        username,
+        nsId,
+    };
+    Object.keys(stringFields).forEach(field => {
+        if (stringFields[field] !== undefined) {
+            assert(typeof stringFields[field] === 'string',
+                `bad config: ${field} must be a string`);
+        }
+    });
+}
+
 function locationConstraintAssert(locationConstraints) {
     const supportedBackends =
-          ['mem', 'file', 'scality',
+          ['mem', 'file', 'scality', 'dmf',
            'mongodb'].concat(Object.keys(validExternalBackends));
     assert(typeof locationConstraints === 'object',
         'bad config: locationConstraints must be an object');
@@ -302,6 +332,9 @@ function locationConstraintAssert(locationConstraints) {
         if (locationConstraints[l].type === 'gcp') {
             gcpLocationConstraintAssert(l, locationConstraints[l]);
         }
+        if (locationConstraints[l].type === 'dmf') {
+            dmfLocationConstraintAssert(l, locationConstraints[l]);
+        }
         if (locationConstraints[l].type === 'pfs') {
             assert(typeof details.pfsDaemonEndpoint === 'object',
             'bad config: pfsDaemonEndpoint is mandatory and must be an object');