Add dropbox watch node.

Author: hindessm

dropbox/dropbox.html

@@ -65,6 +65,49 @@
 })();
 </script>
 
+<script type="text/x-red" data-template-name="dropbox in">
+    <div class="form-row">
+        <label for="node-input-dropbox"><i class="fa fa-user"></i> Dropbox</label>
+        <input type="text" id="node-input-dropbox">
+    </div>
+    <div class="form-row node-input-filepattern">
+         <label for="node-input-filepattern"><i class="fa fa-file"></i> Filename Pattern</label>
+         <input type="text" id="node-input-filepattern" placeholder="Filepattern">
+    </div>
+    <div class="form-row">
+        <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
+        <input type="text" id="node-input-name" placeholder="Name">
+    </div>
+</script>
+
+<script type="text/x-red" data-help-name="dropbox in">
+    <p>Dropbox watch node. Watches for file events on Dropbox. By default all
+    file events are reported, but the filename pattern can be supplied
+    to limit the events to files which have full filenames that match
+    the glob pattern. The event messages consist of the full filename
+    in <b>msg.payload</b> property, the filename in <b>msg.file</b>,
+    the event type in <b>msg.event</b> and the full change object
+    in <b>msg.data</b>.</p>
+</script>
+
+<script type="text/javascript">
+    RED.nodes.registerType('dropbox in',{
+        category: 'storage-input',
+        color:"#C0DEED",
+        defaults: {
+            dropbox: {type:"dropbox-config",required:true},
+            filepattern: {value:""},
+            name: {value:""}
+        },
+        inputs: 0,
+        outputs: 1,
+        icon: "dropbox.png",
+        label: function() {
+            return this.name||this.filepattern||'Dropbox';
+        }
+    });
+</script>
+
 <script type="text/x-red" data-template-name="dropbox">
     <div class="form-row">
         <label for="node-input-dropbox"><i class="fa fa-user"></i> Dropbox</label>

dropbox/dropbox.js

@@ -30,6 +30,66 @@ module.exports = function(RED) {
         }
     });
 
+    function DropboxInNode(n) {
+        RED.nodes.createNode(this,n);
+        this.filepattern = n.filepattern || "";
+        this.dropboxConfig = RED.nodes.getNode(n.dropbox);
+        var credentials = this.dropboxConfig ? this.dropboxConfig.credentials : {};
+        if (!credentials.appkey || !credentials.appsecret ||
+            !credentials.accesstoken) {
+            this.warn("Missing dropbox credentials");
+            return;
+        }
+
+        var node = this;
+        var dropbox = new Dropbox.Client({
+            //uid: credentials.uid,
+            key: credentials.appkey,
+            secret: credentials.appsecret,
+            token: credentials.accesstoken,
+        });
+        node.status({fill:"blue",shape:"dot",text:"initializing"});
+        dropbox.pullChanges(function(err, data) {
+            if (err) {
+                node.error("initialization failed " + err.toString());
+                node.status({fill:"red",shape:"ring",text:"failed"});
+                return;
+            }
+            node.status({});
+            node.state = data.cursor();
+            node.on("input", function(msg) {
+                node.status({fill:"blue",shape:"dot",text:"checking for changes"});
+                dropbox.pullChanges(node.state, function(err, data) {
+                    if (err) {
+                        node.warn("failed to fetch changes" + err.toString());
+                        node.status({}); // clear status since poll retries anyway
+                        return;
+                    }
+                    node.state = data.cursor();
+                    node.status({});
+                    var changes = data.changes;
+                    for (var i = 0; i < changes.length; i++) {
+                        var change = changes[i];
+                        msg.payload = change.path;
+                        msg.file = change.path.substring(change.path.lastIndexOf('/') + 1);
+                        msg.event = change.wasRemoved ? 'delete' : 'add';
+                        msg.data = change;
+                        node.send(msg);
+                    }
+                });
+            });
+            var interval = setInterval(function() {
+                node.emit("input", {});
+            }, 900000); // 15 minutes
+            node.on("close", function() {
+                if (interval !== null) {
+                    clearInterval(interval);
+                }
+            });
+        });
+    }
+    RED.nodes.registerType("dropbox in",DropboxInNode);
+
     function DropboxQueryNode(n) {
         RED.nodes.createNode(this,n);
         this.filename = n.filename || "";
@@ -71,7 +131,6 @@ module.exports = function(RED) {
     }
     RED.nodes.registerType("dropbox",DropboxQueryNode);
 
-
     function DropboxOutNode(n) {
         RED.nodes.createNode(this,n);
         this.filename = n.filename || "";