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assigning a cookie within a VFP automation server

Posted on 1998-09-16
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Last Modified: 2010-04-09
The following is basic question about cookies: I have a DCOM application (basically an automation sever
 created in VFP 5.0); call it classA. When classA is loaded from a web browser using foxisapi.dll, it returns an
 HTML web page asking the user to logon by furnishing a username and password. If the logon is successful, I
 use these name and password as ((input name="Cookie" type = "hidden" value = "the username and the
 password")) within all ((form)) and ((a href)) tags in subsequent web pages. This helps me identify the current
 user so that the correct data is displayed on the return web page. In this sense, the password and username are
 behaving like a cookie. The problem is that they appear as parameters at the URL when a ((a href)) link is
 clicked. With a "submit" button I put ((method="post")) in the ((form)) tag so that no parameters appear in the
 URL when the button is clicked. Is there a way to not make them appear in the case of ((a href)), so that to hide
 at least the password of the user; and how can I assign a cookie to the user and store on the user's computer?
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Question by:matala
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4 Comments
 
LVL 8

Expert Comment

by:jbirk
ID: 1837855
Yes cookies can do what you ask, but it's not a simple proposition.  I can post the cookie library I use (when I get home) if you want.
It comes with pretty good documentation, so you can probably just figure out how to use it.
But 1 point isn't very much incentive to do much more than that.
-josh
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LVL 8

Accepted Solution

by:
jbirk earned 20 total points
ID: 1837856
OK, here's the library of cookie function I use.  It's from the book I use: JavaScript, the Definitive Guide.

<!-- This example is from JavaScript: The Definitive Guide, 3rd Edition.   -->
<!-- That book and this example were Written by David Flanagan.            -->
<!-- They are Copyright (c) 1996, 1997, 1998 O'Reilly & Associates.        -->
<!-- This example is provided WITHOUT WARRANTY either expressed or implied.-->
<!-- You may study, use, modify, and distribute it for any purpose,        -->
<!-- as long as this notice is retained.                                   -->

<SCRIPT LANGUAGE="JavaScript1.1">

// The constructor function: creates a cookie object for the specified
// document, with a specified name and optional attributes.
// Arguments:
//   document: The Document object that the cookie is stored for. Required.
//   name:     A string that specifies a name for the cookie. Required.
//   hours:    An optional number that specifies the number of hours from now
//             that the cookie should expire.
//   path:     An optional string that specifies the cookie path attribute.
//   domain:   An optional string that specifies the cookie domain attribute.
//   secure:   An optional Boolean value that, if true, requests a secure cookie.
//
function Cookie(document, name, hours, path, domain, secure)
{
    // All the predefined properties of this object begin with '$'
    // to distinguish them from other properties which are the values to
    // be stored in the cookie.
    this.$document = document;
    this.$name = name;
    if (hours)
        this.$expiration = new Date((new Date()).getTime() + hours*3600000);
    else this.$expiration = null;
    if (path) this.$path = path; else this.$path = null;
    if (domain) this.$domain = domain; else this.$domain = null;
    if (secure) this.$secure = true; else this.$secure = false;
}

// This function is the store() method of the Cookie object.
function _Cookie_store()
{
    // First, loop through the properties of the Cookie object and
    // put together the value of the cookie. Since cookies use the
    // equals sign and semicolons as separators, we'll use colons
    // and ampersands for the individual state variables we store
    // within a single cookie value. Note that we escape the value
    // of each state variable, in case it contains punctuation or other
    // illegal characters.
    var cookieval = "";
    for(var prop in this) {
        // Ignore properties with names that begin with '$' and also methods.
        if ((prop.charAt(0) == '$') || ((typeof this[prop]) == 'function'))
            continue;
        if (cookieval != "") cookieval += '&';
        cookieval += prop + ':' + escape(this[prop]);
    }

    // Now that we have the value of the cookie, put together the
    // complete cookie string, which includes the name and the various
    // attributes specified when the Cookie object was created.
    var cookie = this.$name + '=' + cookieval;
    if (this.$expiration)
        cookie += '; expires=' + this.$expiration.toGMTString();
    if (this.$path) cookie += '; path=' + this.$path;
    if (this.$domain) cookie += '; domain=' + this.$domain;
    if (this.$secure) cookie += '; secure';

    // Now store the cookie by setting the magic Document.cookie property.
    this.$document.cookie = cookie;
}
// This function is the load() method of the Cookie object.
function _Cookie_load()
{
    // First, get a list of all cookies that pertain to this document.
    // We do this by reading the magic Document.cookie property.
    var allcookies = this.$document.cookie;
    if (allcookies == "") return false;

    // Now extract just the named cookie from that list.
    var start = allcookies.indexOf(this.$name + '=');
    if (start == -1) return false;   // Cookie not defined for this page.
    start += this.$name.length + 1;  // Skip name and equals sign.
    var end = allcookies.indexOf(';', start);
    if (end == -1) end = allcookies.length;
    var cookieval = allcookies.substring(start, end);

    // Now that we've extracted the value of the named cookie, we've
    // got to break that value down into individual state variable
    // names and values. The name/value pairs are separated from each
    // other by ampersands, and the individual names and values are
    // separated from each other by colons. We use the split method
    // to parse everything.
    var a = cookieval.split('&');    // Break it into array of name/value pairs.
    for(var i=0; i < a.length; i++)  // Break each pair into an array.
        a[i] = a[i].split(':');

    // Now that we've parsed the cookie value, set all the names and values
    // of the state variables in this Cookie object. Note that we unescape()
    // the property value, because we called escape() when we stored it.
    for(var i = 0; i < a.length; i++) {
        this[a[i][0]] = unescape(a[i][1]);
    }

    // We're done, so return the success code.
    return true;
}

// This function is the remove() method of the Cookie object.
function _Cookie_remove()
{
    var cookie;
    cookie = this.$name + '=';
    if (this.$path) cookie += '; path=' + this.$path;
    if (this.$domain) cookie += '; domain=' + this.$domain;
    cookie += '; expires=Fri, 02-Jan-1970 00:00:00 GMT';

    this.$document.cookie = cookie;
}

// Create a dummy Cookie object, so we can use the prototype object to make
// the functions above into methods.
new Cookie();
Cookie.prototype.store = _Cookie_store;
Cookie.prototype.load = _Cookie_load;
Cookie.prototype.remove = _Cookie_remove;

//===================================================================
//  The code above is the definition of the Cookie class.
//  The code below is a sample use of that class.
//===================================================================

// Create the cookie we'll use to save state for this web page.
// Since we're using the default path, this cookie will be accessible
// to all web pages in the same directory as this file or "below" it.
// Therefore, it should have a name that is unique among those pages.
// Note that we set the expiration to 10 days in the future.
var visitordata = new Cookie(document, "name_color_count_state", 240);

// First, try to read data stored in the cookie. If the cookie is not
// defined, or if it doesn't contain the data we need, then query the
// user for that data.
if (!visitordata.load() || !visitordata.name || !visitordata.color) {
    visitordata.name = prompt("What is your name:", "");
    visitordata.color = prompt("What is your favorite color:", "");
}

// Keep track of how many times this user has visited the page:
if (visitordata.visits == null) visitordata.visits = 0;
visitordata.visits++;

// Store the cookie values, even if they were already stored, so that the
// expiration date will be reset to 10 days from this most recent visit.
// Also, store them again to save the updated visits state variable.
visitordata.store();

// Now we can use the state variables we read:
document.write('<FONT SIZE=7 COLOR="' + visitordata.color + '">' +
               'Welcome, ' + visitordata.name + '!' +
               '</FONT>' +
               '<P>You have visited ' + visitordata.visits + ' times.');
</SCRIPT>

<FORM>
<INPUT TYPE="button" VALUE="Forget My Name" onClick="visitordata.remove();">
</FORM>


Enjoy,
Josh
0
 

Author Comment

by:matala
ID: 1837857
Sorry about the 1 point.  I am running low on my balance!  I would appreciate the documentation about cookies library.  Thanks.
0
 
LVL 8

Expert Comment

by:jbirk
ID: 1837858
That's included above in the code.  The documentation is all in comments.  I think it's pretty clear, but it's so much documentation, that I would delete it all after reading it to preserve space (and reduce file size).  The documentation provided is all about how to use the code properly.  But if you were interested in knowing how each line works, just ask about the lines of code you don;t understand and I will try to explain them.

-Josh
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