(Go) Google Contacts - Retrieve All Contacts

Demonstrates how to retrieve the full list of contacts for the Google Contacts API.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // --------------------------------------------------------------------------------------------------------
    // Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
    // Once connected, the REST object may be re-used for many REST API calls.
    // (It's a good idea to put the connection setup code in a separate function/subroutine.)
    // --------------------------------------------------------------------------------------------------------

    // It is assumed we previously obtained an OAuth2 access token.
    // This example loads the JSON access token file 
    // saved by this example: Get Google Contacts OAuth2 Access Token

    jsonToken := chilkat.NewJsonObject()
    success := jsonToken.LoadFile("qa_data/tokens/googleContacts.json")
    if success != true {
        fmt.Println("Failed to load googleContacts.json")
        jsonToken.DisposeJsonObject()
        return
    }

    gAuth := chilkat.NewAuthGoogle()
    gAuth.SetAccessToken(*jsonToken.StringOf("access_token"))

    rest := chilkat.NewRest()

    // Connect using TLS.
    bAutoReconnect := true
    success = rest.Connect("www.google.com",443,true,bAutoReconnect)

    // Provide the authentication credentials (i.e. the access token)
    rest.SetAuthGoogle(gAuth)

    // ----------------------------------------------
    // OK, the REST connection setup is completed..
    // ----------------------------------------------

    // To retrieve the contacts, we need to send the following:

    // 	GET /m8/feeds/contacts/default/full
    // 	GData-Version: 3.0

    rest.AddHeader("GData-Version","3.0")

    sbResponseBody := chilkat.NewStringBuilder()
    success = rest.FullRequestNoBodySb("GET","/m8/feeds/contacts/default/full",sbResponseBody)
    if success != true {
        fmt.Println(rest.LastErrorText())
        jsonToken.DisposeJsonObject()
        gAuth.DisposeAuthGoogle()
        rest.DisposeRest()
        sbResponseBody.DisposeStringBuilder()
        return
    }

    // A successful response will have a status code equal to 200.
    if rest.ResponseStatusCode() != 200 {
        fmt.Println("response status code = ", rest.ResponseStatusCode())
        fmt.Println("response status text = ", rest.ResponseStatusText())
        fmt.Println("response header: ", rest.ResponseHeader())
        fmt.Println("response body: ", *sbResponseBody.GetAsString())
        jsonToken.DisposeJsonObject()
        gAuth.DisposeAuthGoogle()
        rest.DisposeRest()
        sbResponseBody.DisposeStringBuilder()
        return
    }

    // If the 200 response was received, then the contacts XML is contained
    // in the response body.
    xml := chilkat.NewXml()
    xml.LoadSb(sbResponseBody,false)

    // See below for a sample response body.
    xml.SaveXml("qa_output/google_contacts.xml")

    // Now let's parse the XML...

    // Get the the total number of results, the start index, and the items per page.
    // We'll likely NOT get the full list, but will instead get the 1st page.
    totalResults := xml.GetChildIntValue("openSearch:totalResults")
    startIndex := xml.GetChildIntValue("openSearch:startIndex")
    itemsPerPage := xml.GetChildIntValue("openSearch:itemsPerPage")
    fmt.Println("totalResults = ", totalResults)
    fmt.Println("startIndex = ", startIndex)
    fmt.Println("itemsPerPage = ", itemsPerPage)

    // We'll borrow a method from FileAccess to get the contactId from the URL string (see the code in the while loop)
    fac := chilkat.NewFileAccess()

    // Iterate over each contact.
    numEntries := xml.NumChildrenHavingTag("entry")
    i := 0
    for i < numEntries {
        xml.SetI(i)
        fmt.Println(i + 1, " ----")
        fmt.Println("title: ", *xml.GetChildContent("entry[i]|title"))

        // The entry "id" child contains a URL having this format:
        // <id>http://www.google.com/m8/feeds/contacts/{userEmail}/base/{contactId}</id>
        // Let's get the URL and parse the contactId from it..
        idUrl := xml.GetChildContent("entry[i]|id")
        fmt.Println("id: ", *idUrl)

        // Use the parsing ability of GetFileName to get the contactId
        contactId := fac.GetFileName(*idUrl)
        fmt.Println("contactId: ", *contactId)

        fullName := xml.ChilkatPath("entry[i]|gd:name|gd:fullName|*")
        if xml.LastMethodSuccess() == true {
            fmt.Println("fullName: ", *fullName)
        }

        emailAddress := xml.ChilkatPath("entry[i]|gd:email|(address)")
        if xml.LastMethodSuccess() == true {
            fmt.Println("email address: ", *emailAddress)
        }

        i = i + 1
    }

    // The response body XML looks something like this:

    // 	<feed xmlns="http://www.w3.org/2005/Atom"
    // 	    xmlns:openSearch="http://a9.com/-/spec/opensearch/1.1/"
    // 	    xmlns:gContact="http://schemas.google.com/contact/2008"
    // 	    xmlns:batch="http://schemas.google.com/gdata/batch"
    // 	    xmlns:gd="http://schemas.google.com/g/2005"
    // 	    gd:etag="feedEtag">
    // 	  <id>userEmail</id>
    // 	  <updated>2008-12-10T10:04:15.446Z</updated>
    // 	  <category scheme="http://schemas.google.com/g/2005#kind" term="http://schemas.google.com/contact/2008#contact"/>
    // 	  <link rel="http://schemas.google.com/g/2005#feed" type="application/atom+xml"
    // 	      href="https://www.google.com/m8/feeds/contacts/userEmail/full"/>
    // 	  <link rel="http://schemas.google.com/g/2005#post" type="application/atom+xml"
    // 	      href="https://www.google.com/m8/feeds/contacts/userEmail/full"/>
    // 	  <link rel="http://schemas.google.com/g/2005#batch" type="application/atom+xml"
    // 	      href="https://www.google.com/m8/feeds/contacts/userEmail/full/batch"/>
    // 	  <link rel="self" type="application/atom+xml"
    // 	      href="https://www.google.com/m8/feeds/contacts/userEmail/full?max-results=25"/>
    // 	  <author>
    // 	    <name>User</name>
    // 	    <email>userEmail</email>
    // 	  </author>
    // 	  <generator version="1.0" uri="http://www.google.com/m8/feeds">
    // 	    Contacts
    // 	  </generator>
    // 	  <openSearch:totalResults>349</openSearch:totalResults>
    // 	  <openSearch:startIndex>1</openSearch:startIndex>
    // 	  <openSearch:itemsPerPage>25</openSearch:itemsPerPage>
    // 	  <entry gd:etag="contactEtag">
    // 	    <id>
    // 	      http://www.google.com/m8/feeds/contacts/userEmail/base/contactId
    // 	    </id>
    // 	    <updated>2008-12-10T04:45:03.331Z</updated>
    // 	    <app:edited xmlns:app="http://www.w3.org/2007/app">2008-12-10T04:45:03.331Z</app:edited>
    // 	    <category scheme="http://schemas.google.com/g/2005#kind"
    // 	        term="http://schemas.google.com/contact/2008#contact"/>
    // 	    <title>Fitzwilliam Darcy</title>
    // 	    <gd:name>
    // 	      <gd:fullName>Fitzwilliam Darcy</gd:fullName>
    // 	    </gd:name>
    // 	    <link rel="http://schemas.google.com/contacts/2008/rel#photo" type="image/*"
    // 	        href="https://www.google.com/m8/feeds/photos/media/userEmail/contactId"
    // 	        gd:etag="photoEtag"/>
    // 	    <link rel="self" type="application/atom+xml"
    // 	        href="https://www.google.com/m8/feeds/contacts/userEmail/full/contactId"/>
    // 	    <link rel="edit" type="application/atom+xml"
    // 	        href="https://www.google.com/m8/feeds/contacts/userEmail/full/contactId"/>
    // 	    <gd:phoneNumber rel="http://schemas.google.com/g/2005#home"
    // 	        primary="true">
    // 	      456
    // 	    </gd:phoneNumber>
    // 	    <gd:extendedProperty name="pet" value="hamster"/>
    // 	    <gContact:groupMembershipInfo deleted="false"
    // 	        href="http://www.google.com/m8/feeds/groups/userEmail/base/groupId"/>
    //         <gd:email rel="http://schemas.google.com/g/2005#other" address="darcyf@example.com" primary="true" />
    // 	  </entry>
    // 	  <!-- Other entries ... -->
    // 	</feed>
    // 

    jsonToken.DisposeJsonObject()
    gAuth.DisposeAuthGoogle()
    rest.DisposeRest()
    sbResponseBody.DisposeStringBuilder()
    xml.DisposeXml()
    fac.DisposeFileAccess()