help with linkedin oauth

[jasonwucinski]

Hello everyone,
I am new to grails as well as this forum. If i have posted in the wrong spot, please excuse me. I am working on creating a grails project that works with oauth plugin (i am using SpringSource as my development environment) to connect to linkedin profile. i have a controller that connects and captures the data (using REST). Everything seems to work fine. the controller uses this:

   def response = oauthService.accessResource(
                apiUrl, 'linkedin', [key:session.oauthToken.key, secret:session.oauthToken.secret], 'GET')

and returns an xml stream similar to this:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<person>
  <id>some string</id>
  <first-name>MyFirstName</first-name>
  <last-name>MyLastName</last-name>
</person>

my question is this: How do i parse the response variable? for instance, what if i want to pick out the first-name and do something with it? My next question would be: How do i deal with repeating data, but I will see how this one goes.

Thank you
jason

[pledbrook]

I would use XmlSlurper. For example, assuming that 'response' is an input stream:

def data = new XmlSlurper().parse(response)
def firstName = data.'first-name'.text()

See the Groovy documentation for more info on XmlSlurper. And one quick note: controllers have a property called 'response' injected into them (it's the HttpServletResponse) so I recommend using a different local variable name.

[jasonwucinski]

thank you for your response. I've been looking at using XmlSlurper but i'm getting errors when i try to parse the data. if your provided example:

def data = new XmlSlurper().parse(response)
def firstName = data.'first-name'.text()
print (firstName)

'first-name' and .text are both underlined, assuming because they are not recognized. i also get the following error:

Stacktrace follows:
java.io.FileNotFoundException: C:\Users\Delerium\Documents\workspace-sts-2.6.1.RELEASE\dct\<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<person>
<id>jIi-hRi4cI<\id>
<first-name>Jason<\first-name>
<last-name>Wucinski<\last-name>
<\person>
(The filename, directory name, or volume label syntax is incorrect)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.jav a:120)
at java.io.FileInputStream.<init>(FileInputStream.jav a:79)
at com.sun.org.apache.xerces.internal.impl.XMLEntityM anager.setupCurrentEntity(XMLEntityManager.java:65 3)
at com.sun.org.apache.xerces.internal.impl.XMLVersion Detector.determineDocVersion(XMLVersionDetector.ja va:186)
at com.sun.org.apache.xerces.internal.parsers.XML11Co nfiguration.parse(XML11Configuration.java:772)
at com.sun.org.apache.xerces.internal.parsers.XML11Co nfiguration.parse(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLPars er.parse(XMLParser.java:119)
at com.sun.org.apache.xerces.internal.parsers.Abstrac tSAXParser.parse(AbstractSAXParser.java:1205)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserI mpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
at com.loudmountain.dct.profileController.processData (profileController.groovy:46)
at com.loudmountain.dct.profileController.this$2$proc essData(profileController.groovy)
at com.loudmountain.dct.profileController$_closure1.d oCall(profileController.groovy:25)
at com.loudmountain.dct.profileController$_closure1.d oCall(profileController.groovy)
at java.lang.Thread.run(Thread.java:662)


what am i doing wrong? thank you for your help
jason

[pledbrook]

It is to be expected that 'first-name' and .text() are underlined, that's not a problem.

The exception probably stems from 'response' not being of the type I think it is. Is it a string rather than an input stream?

[jasonwucinski]

i apologize for any confusion. Yeah, it must be a string. the controller I'm using was part of a tutorial that didn't really explain what was going on. It's something that is returned from linkedin (object? string?). bellow is the controller that gets the xml.

class profileController {
    def apiUrl = "http://api.linkedin.com/v1/people/~:(" +
    "id," +
	"first-name," +
	"last-name" +
	")" 


    def oauthService    
    def index = {
        if (session.oauthToken == null) {
            redirect(uri:"/")
        }
        if (params?.apiUrl) apiUrl = params.apiUrl        
        def linkedinResponse = oauthService.accessResource(
                apiUrl, 'linkedin', [key:session.oauthToken.key, secret:session.oauthToken.secret], 'GET')	
		processData(linkedinResponse) //this is where i send the item to my code to be processed.
		
        render(view: 'index', model: [profileXML: linkedinResponse, apiUrl: apiUrl])
    }

    def change = {
        if (params?.apiUrl) {
            println("Setting api url to " + params.apiUrl)
	    apiUrl = params.apiUrl
		
        }
        
        redirect(action:index,params:params)
    }

edit:
i think it may be due to first-name having a hyphen. when i use three double quotes around first-name, i dont get an error. below is my new code:

XmlParser parser = new XmlParser()
def myPerson = parser.parseText (linkedinResponse)  //changed response to linkedinResponse

myPerson."""first-name""".each { 
	print myPerson."""first-name""".value
}

this does not produce an error but only prints out []

[pledbrook]

Triple quotes do nothing different to single quotes in this case - except generate more noise. They should only be used for multi-line strings.

This code works for me in Groovy console with the XML document that you included in your first post:

def xml = new XmlSlurper().parseText(testXml)
for (name in xml.'first-name') {
    println name.text()
}

This will print "MyFirstName". Of course, using a loop only makes sense if there are more than one 'first-name' elements in the source XML document. With just a single person, you're better off with:

def xml = new XmlSlurper().parseText(testXml)
println xml.'first-name'.text()

Also remember to always use the text() method for both elements and attributes to get the content of each as a string.

Hope that helps.

[jasonwucinski]

that did it. thanks!