Adding credentials set support demisto rest api

Packs/DemistoRESTAPI/.pack-ignore

@@ -1,5 +1,5 @@
 [file:DemistoRESTAPI.yml]
-ignore=IN139,DS107,IN145
+ignore=IN139,DS107,IN145,IN124
 
 [file:DemistoUploadFileV2.yml]
 ignore=SC105

Packs/DemistoRESTAPI/Integrations/DemistoRESTAPI/DemistoRESTAPI.js

@@ -15,13 +15,16 @@ sendMultipart = function (uri, entryID, body) {
         // do nothing, use the body as is in the request.
         logDebug('could not parse body as a JSON object, passing as is. body: ' + JSON.stringify(body));
     }
-
+    var key = [params.apikey? params.apikey : (params.creds_apikey? params.creds_apikey.password : '')];
+    if (key == ''){
+        throw 'API Key must be provided.';
+    }
     var res = httpMultipart(
         requestUrl,
         entryID,
         {
             Headers: {
-                'Authorization': [params.apikey],
+                'Authorization': key,
                 'Content-Type': ['multipart/form-data'],
                 'Accept': ['application/json']
             },
@@ -55,15 +58,18 @@ var sendRequest = function(method, uri, body, raw) {
         requestUrl += '/';
     }
     requestUrl += uri;
-
+    var key = [params.apikey? params.apikey : (params.creds_apikey? params.creds_apikey.password : '')];
+    if (key == ''){
+        throw 'API Key must be provided.';
+    }
     var res = http(
         requestUrl,
         {
             Method: method,
             Headers: {
                 'Accept': ['application/json'],
                 'content-type': ['application/json'],
-                'authorization': [params.apikey]
+                'authorization': key
             },
             Body: body,
             SaveToFile: raw

Packs/DemistoRESTAPI/Integrations/DemistoRESTAPI/DemistoRESTAPI.yml

@@ -11,14 +11,20 @@ configuration:
   defaultvalue: https://127.0.0.1
   type: 0
   required: true
-- display: Demisto Server API Key
-  name: apikey
-  type: 4
-  required: true
+- displaypassword: Demisto Server API Key
+  name: creds_apikey
+  type: 9
+  required: false
+  hiddenusername: true
 - display: Trust any certificate (not secure)
   name: insecure
   type: 8
   required: false
+- display: Demisto Server API Key
+  name: apikey
+  type: 4
+  required: false
+  hidden: true
 - display: Use system proxy settings
   name: proxy
   type: 8

Packs/DemistoRESTAPI/ReleaseNotes/1_2_4.md

@@ -0,0 +1,4 @@
+
+#### Integrations
+##### Demisto REST API
+- Enhanced the *API Key* integration parameter to support credentials fetching object.

Packs/DemistoRESTAPI/pack_metadata.json

@@ -2,7 +2,7 @@
     "name": "Demisto REST API",
     "description": "Use Demisto REST APIs",
     "support": "xsoar",
-    "currentVersion": "1.2.3",
+    "currentVersion": "1.2.4",
     "author": "Cortex XSOAR",
     "url": "https://www.paloaltonetworks.com/cortex",
     "email": "",