{"id":832,"date":"2012-08-24T14:25:50","date_gmt":"2012-08-24T12:25:50","guid":{"rendered":"http:\/\/hasselba.ch\/blog\/?p=832"},"modified":"2012-08-24T14:26:15","modified_gmt":"2012-08-24T12:26:15","slug":"ssjs-execute-remote-ssjs-code","status":"publish","type":"post","link":"https:\/\/hasselba.ch\/blog\/?p=832","title":{"rendered":"SSJS: Execute remote SSJS Code"},"content":{"rendered":"

I have created a small helper class to run SSJS code from a remote server. The basic idea behind this class is a question on stackoverflow: http:\/\/stackoverflow.com\/questions\/12054733\/include-jss-file-from-notes-document-as-resource<\/a><\/p>\n

As far as I know there is no way to add a SSJS resource via the src<\/em> attribute, this won’t work:<\/p>\n

<xp:this.resources>\r\n   <xp:script src=\"http:\/\/localhost:8080\/test.jss\"\r\n      clientSide=\"false\" \/>\r\n<\/xp:this.resources><\/pre>\n
It will always fail, even if the file is available, has the correct file extension etc.<\/p>\n
\"\"<\/p>\n
That’s why I wrote the code, it’s only a proof of concept. There are no security features to protect against manipulations, no caching for better performance and whatever.<\/p>\n
Here is a demo XPage to demonstrate how to use it:<\/p>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<xp:view xmlns:xp=\"http:\/\/www.ibm.com\/xsp\/core\">\r\n\u00a0\u00a0 <xp:label id=\"label1\">\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 <xp:this.value>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <![CDATA[#{javascript:\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 importPackage( ch.hasselba.xpages.util.ssjs );\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SSJSUtil.executeSSJSFromURL(\"http:\/\/localhost:8080\/test.jss\");\r\n            test();<\/span><\/strong>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }]]>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 <\/xp:this.value>\r\n\u00a0\u00a0 <\/xp:label>\r\n<\/xp:view><\/pre>\n
The method executeSSJSFromURL<\/em> loads a text file from the given URL, creates a method binding with the content and invokes it. Then, the SSJS code is executed directly – all functions, objects and variables defined in the remote code are ready to use from now on. As you can see above, the method test()<\/em> is called which is defined in the remote SSJS file.<\/p>\n
And here is the Java code:<\/p>\n
package ch.hasselba.xpages.util.ssjs;\r\n\r\nimport java.io.BufferedReader;\r\nimport java.io.IOException;\r\nimport java.io.InputStream;\r\nimport java.io.InputStreamReader;\r\nimport com.ibm.xsp.util.StreamUtil;\r\nimport com.ibm.xsp.page.compiled.ExpressionEvaluatorImpl;\r\nimport javax.faces.context.FacesContext;\r\nimport javax.faces.el.ValueBinding;\r\n\r\n\/**\r\n\u00a0* SSJSUtil\r\n\u00a0* \r\n\u00a0* helper class for SSJS operations\r\n\u00a0* \r\n\u00a0* @author Sven Hasselbach\r\n\u00a0* @version 1.0.2\r\n\u00a0* @category SSJS\r\n\u00a0* @category Utility\r\n\u00a0*\/\r\n\r\npublic class SSJSUtil {\r\n\r\n\u00a0\u00a0 \u00a0private static final String NEWLINE = \"\\n\";\r\n\u00a0\u00a0 \u00a0private static final String SSJS_EXPRESSION_BEGIN = \"#{javascript:\";\r\n\u00a0\u00a0 \u00a0private static final String SSJS_EXPRESSION_END = \"}\";\r\n\r\n\u00a0\u00a0 \u00a0\/**\r\n\u00a0\u00a0 \u00a0 * Loads SSJS code from a given URL and executes it\r\n\u00a0\u00a0 \u00a0 * Declared methods and objects are reachable for other SSJS code\r\n\u00a0\u00a0 \u00a0 * \r\n\u00a0\u00a0 \u00a0 * @param url of the SSJS code\r\n\u00a0\u00a0 \u00a0 * @return Object resulting object from SSJS execution\r\n\u00a0\u00a0 \u00a0 * @author Sven Hasselbach\r\n\u00a0\u00a0\u00a0\u00a0 * @version 1.0.1\r\n\u00a0\u00a0\u00a0\u00a0 * @category Utility\r\n\u00a0\u00a0 \u00a0 *\/\r\n\u00a0\u00a0 \u00a0public static Object executeSSJSFromURL( final String url ){\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0return execute( loadFromURL( url ) );\r\n\u00a0\u00a0 \u00a0}\r\n\r\n\u00a0\u00a0 \u00a0\/**\r\n\u00a0\u00a0 \u00a0 * loads a URL stream and converts it to a string\r\n\u00a0\u00a0 \u00a0 * @param url of the resource\r\n\u00a0\u00a0 \u00a0 * @return String containing the data loaded from given url\r\n\u00a0\u00a0 \u00a0 * @author Sven Hasselbach\r\n\u00a0\u00a0\u00a0\u00a0 * @version 1.0.1\r\n\u00a0\u00a0\u00a0\u00a0 * @category Utility\r\n\u00a0\u00a0 \u00a0 *\/\r\n\u00a0\u00a0 \u00a0public static String loadFromURL( final String url ){\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0String ret = null;\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0try{\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0FacesContext fc = FacesContext.getCurrentInstance();\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0InputStream in = StreamUtil.getInputStream(fc, url);\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0ret = inputStreamToString( in );\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}catch(Exception e){\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0e.printStackTrace();\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0return ret;\r\n\u00a0\u00a0 \u00a0}\r\n\r\n\u00a0\u00a0 \u00a0\/**\r\n\u00a0\u00a0 \u00a0 * executes given SSJS code and returns the result (if any)\r\n\u00a0\u00a0 \u00a0 * functions \/ libraries are added to runtime \r\n\u00a0\u00a0 \u00a0 * \r\n\u00a0\u00a0 \u00a0 * @param ssjsCode code to execute\r\n\u00a0\u00a0 \u00a0 * @return resulting object\r\n\u00a0\u00a0 \u00a0 * @author Sven Hasselbach\r\n\u00a0\u00a0\u00a0\u00a0 * @version 1.0.2\r\n\u00a0\u00a0\u00a0\u00a0 * @category SSJS\r\n\u00a0\u00a0 \u00a0 *\/\r\n\u00a0\u00a0 \u00a0public static Object execute( final String ssjsCode ){\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0Object ret = null;\r\n\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0try{\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0String valueExpr = SSJS_EXPRESSION_BEGIN + ssjsCode + SSJS_EXPRESSION_END;\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0FacesContext fc = FacesContext.getCurrentInstance();\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0ExpressionEvaluatorImpl evaluator = new ExpressionEvaluatorImpl( fc );\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0ValueBinding vb = evaluator.createValueBinding( fc.getViewRoot(), valueExpr, null, null);\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0ret = vb.getValue(fc);\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}catch(Exception e){\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0e.printStackTrace();\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0return ret;\r\n\u00a0\u00a0 \u00a0}\r\n\r\n\u00a0\u00a0\u00a0 \/**\r\n\u00a0\u00a0\u00a0\u00a0 * converts the data from a given inputstream to a string\r\n\u00a0\u00a0\u00a0\u00a0 * \r\n\u00a0\u00a0\u00a0\u00a0 * @param in InputStream to convert\r\n\u00a0\u00a0\u00a0\u00a0 * @return String containing data from input stream\r\n\u00a0\u00a0\u00a0\u00a0 * @throws IOException\r\n\u00a0\u00a0\u00a0\u00a0 * @author Sven Hasselbach\r\n\u00a0\u00a0\u00a0\u00a0 * @version 1.0.1\r\n\u00a0\u00a0\u00a0\u00a0 * @category Utility\r\n\u00a0\u00a0\u00a0\u00a0 *\/\r\n\u00a0\u00a0\u00a0 public static String inputStreamToString(final InputStream inStream) throws IOException {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 BufferedReader bufReader = new BufferedReader( new InputStreamReader(inStream) );\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 StringBuilder strBuilder = new StringBuilder();\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 String line = null;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 while ((line = bufReader.readLine()) != null) {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0strBuilder.append(line);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0strBuilder.append( NEWLINE );\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 bufReader.close();\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return strBuilder.toString();\r\n\u00a0\u00a0\u00a0\u00a0 }\r\n}<\/pre>\n
By the way: You cannot use the import<\/em> method in the remote code.<\/p>\n","protected":false},"excerpt":{"rendered":"
I have created a small helper class to run SSJS code from a remote server. The basic idea behind this class is a question on stackoverflow: http:\/\/stackoverflow.com\/questions\/12054733\/include-jss-file-from-notes-document-as-resource As far as I know there is no way to add a SSJS … Weiterlesen →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[89,9,76,74],"tags":[7,31,4,5,3],"class_list":["post-832","post","type-post","status-publish","format-standard","hentry","category-java","category-javascript","category-ssjs","category-xpages","tag-domino","tag-java","tag-js","tag-ssjs","tag-xpages"],"_links":{"self":[{"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/posts\/832","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=832"}],"version-history":[{"count":10,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/posts\/832\/revisions"}],"predecessor-version":[{"id":842,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/posts\/832\/revisions\/842"}],"wp:attachment":[{"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=832"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=832"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}