add watermarking functionality

lib/image-magick.js

@@ -24,6 +24,7 @@ ImageMagick.Templates = {
   resizeCmd: "-resize '%{size}'",
   fitCmd: "-gravity center -resize '%{size}'^ -extent %{size}",
   cropCmd: "-crop %{crop} +repage -thumbnail '%{size}'",
+  watermarkCmd: "-gravity northeast", 
 
   checkValue: function(value) {
     if(!value.toString().match(/^[^;"']+$/i))
@@ -88,6 +89,13 @@ ImageMagick.prototype.crop = function(params, callback) {
   }
 }
 
+ImageMagick.prototype.watermark = function(params, callback) {
+//  if(!params.hasOwnProperty('size'))
+//    throw new Error('Resize needs size-param with format <width>x<height>!')
+
+  this._convert(ImageMagick.Templates.get('watermarkCmd', {}), params, callback)
+}
+
 // private
 
 ImageMagick.prototype.execute = function(cmd, options, callback) {
@@ -275,3 +283,42 @@ ImageMagick.prototype._convert = function(_command, params, callback) {
     })
   })
 }
+
+ImageMagick.prototype._composite = function(_command, params, callback) {
+  var source = params.url
+    , self   = this
+    , size   = params.size || params.crop.split('+')[0]
+    , pathHashString
+    , srcTmpPath
+    , destTmpPath
+
+    srcTmpPath = this._createTmpPath(source)
+
+    pathHashString = source + ':' + _command
+
+    destTmpPath = this._createTmpPath(pathHashString)
+
+  this._localizeSource(source, srcTmpPath, function(err, exists, localizedSource) {
+    if(err && !exists)
+      return callback && callback(err, null, null)
+
+    self._getTempfile(localizedSource, destTmpPath, function(tmpfile) {
+      fs.exists(tmpfile, function(tmpFileExists) {
+        if(tmpFileExists) {
+          self.logger.log('Converted file already exists. Skipping composite')
+          callback(null, tmpfile)
+        } else {
+          self.logger.log('Converted file does not exist. Converting...')
+          var command = "convert -composite " + _command + " '" + localizedSource + "' /data/watermark/shared/watermark.png '" + tmpfile + "'"
+
+          if(!exists)
+            command = self._getFallbackImageCommand(size, tmpfile)
+
+          self.execute(command, { timeout: self.config.timeouts.convert }, function (err, stdout, stderr) {
+            callback && callback(err, tmpfile)
+          })
+        }
+      })
+    })
+  })
+}

lib/request-handler.js

@@ -91,7 +91,7 @@ RequestHandler.prototype.isImageProcessUrl = function(req) {
 }
 
 RequestHandler.prototype.getImageProcessUrlRegExp = function() {
-  var template = "^\/(identify|resize|crop|fit)(\/([^\/\?]+))?"
+  var template = "^\/(watermark|identify|resize|crop|fit)(\/([^\/\?]+))?"
 
   if (this.config.hasOwnProperty('namespace') && (this.config.namespace != ''))
     template = template.replace("^", "^\/" + this.config.namespace)