From a993ae58f3c848bbf46c90f217d1dbc1f44828c1 Mon Sep 17 00:00:00 2001
From: Aaron LI <aaronly.me@outlook.com>
Date: Wed, 23 Nov 2016 16:53:57 +0800
Subject: webui: products: Implement GET action "which"

The "which" GET action try to locate the given executable name/path, in
order to check whether the executable callable.

This function will be used to check the validity of the specified FITS
viewer, which opens the HPX FITS images.
---
 fg21sim/webui/handlers/products.py  | 17 +++++++++++++++++
 fg21sim/webui/static/js/products.js | 21 ++++++++++++++++++++-
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/fg21sim/webui/handlers/products.py b/fg21sim/webui/handlers/products.py
index f68fa5d..ffb27bb 100644
--- a/fg21sim/webui/handlers/products.py
+++ b/fg21sim/webui/handlers/products.py
@@ -8,6 +8,7 @@ Handle the AJAX requests from the client to manage the simulation products.
 
 import os
 import logging
+import shutil
 
 import tornado.ioloop
 from tornado.escape import json_decode, json_encode
@@ -41,16 +42,32 @@ class ProductsAJAXHandler(BaseRequestHandler):
 
         Supported actions:
         - get: Get the current products manifest
+        - which: Locate the command/program (check whether the command/program
+                 can be found in PATH and is executable)
         - download: TODO
         - open: TODO
         """
         action = self.get_argument("action", "get")
         if action == "get":
+            # Get current products manifest
             response = {
                 "manifest": self.products.manifest,
                 "localhost": self.from_localhost,
             }
             success = True
+        elif action == "which":
+            # Locate (and check) the command/program
+            cmd = json_decode(self.get_argument("cmd"))
+            cmdpath = shutil.which(cmd)
+            if cmdpath:
+                success = True
+                response = {
+                    "isExecutable": True,
+                    "cmdPath": cmdpath,
+                }
+            else:
+                success = False
+                reason = "Cannot locate the executable for: {0}".format(cmd)
         else:
             # ERROR: bad action
             success = False
diff --git a/fg21sim/webui/static/js/products.js b/fg21sim/webui/static/js/products.js
index 0b25eaa..72a7028 100644
--- a/fg21sim/webui/static/js/products.js
+++ b/fg21sim/webui/static/js/products.js
@@ -191,6 +191,25 @@ var getServerManifest = function (url) {
 };
 
 
+/**
+ * Locate the command in the `$PATH` on the server, which checks
+ * whether the command can be called.
+ *
+ * @param {String} cmd - The command name or path.
+ */
+var whichExecutable = function (url, cmd) {
+  return $.getJSON(url, {action: "which", cmd: JSON.stringify(cmd)})
+    .fail(function (jqxhr) {
+      var modalData = {};
+      modalData.icon = "times-circle";
+      modalData.contents = "Cannot locate the command in PATH!";
+      modalData.code = jqxhr.status;
+      modalData.reason = jqxhr.statusText;
+      showModalProducts(modalData);
+    });
+};
+
+
 /**
  * Reset the products manifest on both the server side and client side
  */
@@ -270,7 +289,7 @@ $(document).ready(function () {
 
   // Save current products manifest
   $("#save-products").on("click", function () {
-    saveServerManifest(ajax_url);
+    saveServerManifest(ajax_url, true);
   });
 
   // Show product information (metadata)
-- 
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