ObjectCommand: support JSON via STDIN

fixes #1570

doc/60-CLI.md

@@ -75,6 +75,12 @@ icingacli director host create localhost \
     --json '{ "address": "127.0.0.1", "vars": { "test": [ "one", "two" ] } }'
 ```
 
+Passing JSON via STDIN is also possible:
+
+```shell
+icingacli director host create localhost --json < my-host.json
+```
+
 
 ### Delete a specific object
 

doc/82-Changelog.md

@@ -27,6 +27,7 @@ v1.10.0 (unreleased)
 ### CLI
 * FIX: config deploy doesn't try to wait in case of no deployment (#2522)
 * FEATURE: improved wording for deployment error messages (#2523)
+* FEATURE: JSON can now be shipped via STDIN (#1570)
 
 1.9.1
 -----

library/Director/Cli/ObjectCommand.php

@@ -441,12 +441,36 @@ class ObjectCommand extends Command
     protected function remainingParams()
     {
         if ($json = $this->params->shift('json')) {
+            if ($json === true) {
+                $json = $this->readFromStdin();
+                if ($json === null) {
+                    $this->fail('Please pass JSON either via STDIN or via --json');
+                }
+            }
             return (array) $this->parseJson($json);
         } else {
             return $this->params->getParams();
         }
     }
 
+    protected function readFromStdin()
+    {
+        if (!defined('STDIN')) {
+            define('STDIN', fopen("php://stdin","r"));
+        }
+        $inputIsTty = function_exists('posix_isatty') && posix_isatty(STDIN);
+        if ($inputIsTty) {
+            return null;
+        }
+
+        $stdin = file_get_contents('php://stdin');
+        if (strlen($stdin) === 0) {
+            return null;
+        }
+
+        return $stdin;
+    }
+
     protected function exists($name)
     {
         return IcingaObject::existsByType(