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JSON.java
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JSON.java
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/*
* Copyright (C) 2016 Virgo Venture, Inc.
* @%@~LICENSE~@%@
*/
package win.iovar.web.usr.bin;
// local imports:
import win.iovar.json.*;
import win.iovar.parse.*;
import win.iovar.web.*;
import win.iovar.web.bin.shell.*;
import win.iovar.web.dev.*;
// java imports:
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
// 3rd-party imports:
/**
*
* @author shawn@lannocc.com
*/
public class JSON extends HttpServlet
{
protected void doHead (final HttpServletRequest req, final HttpServletResponse resp) throws IOException
{
Utils.doHead (this, req, resp);
}
protected void doGet (final HttpServletRequest req, final HttpServletResponse resp) throws IOException
{
Utils.doGet (this, req, resp);
}
protected void doPut (final HttpServletRequest req, final HttpServletResponse resp) throws IOException
{
Utils.doPut (this, req, resp);
}
public void usage (final HttpServletResponse resp) throws IOException
{
Log.debug ("displaying usage");
resp.setContentType ("text/plain");
final PrintWriter out = resp.getWriter ();
out.println ("usage: json [node] ...");
out.println ();
out.println ("Return the value of stdin interpreted as json and traversed down the given nodes (optional).");
out.println ();
out.println ("Options:");
out.println (" ?help - display this help screen");
out.println (" ?quiet - quiet operation: a matching value is still printed");
out.println (" but errors and mismatches are not displayed.");
out.println (" ?clean - clean output: remove the quotes around a json string,");
out.println (" usable for final json value only.");
}
protected void doPost (final HttpServletRequest req, final HttpServletResponse resp) throws IOException
{
final ServletContext context = getServletContext ();
final String query = req.getQueryString ();
final Map<String,List<String>> params = Utils.getParams (query);
if (params.containsKey ("help"))
{
usage (resp);
Shell.exit (req, context, 0);
return;
}
final PrintWriter out = resp.getWriter ();
final boolean quiet = params.containsKey ("quiet");
JSONValue json = new JSONValue (); try
{
final GraphReader in = new GraphReader (new InputStreamReader (req.getInputStream ()));
if (json.assemble (in))
{
final List<String> nodes = params.get (null);
if (nodes != null)
{
for (final String node : nodes)
{
final Value val = json.value ();
if (val instanceof JSONMap)
{
json = ((JSONMap) val).get (node);
if (json == null)
{
if (! quiet) out.println ("json: requested node does not exist as key in json map: "+node);
Shell.exit (req, context, 3);
return;
}
}
else if (val instanceof JSONArray)
{
try
{
json = ((JSONArray) val).get (Integer.parseInt (node));
}
catch (final NumberFormatException e)
{
if (! quiet) out.println ("json: requested node is not an integer index for json array: "+node+": "+e);
Shell.exit (req, context, 4);
return;
}
catch (final IndexOutOfBoundsException e)
{
if (! quiet) out.println ("json: requested node json array index does not exist: "+e);
Shell.exit (req, context, 5);
return;
}
}
else
{
if (! quiet) out.println ("json: requesting a node beyond applicable input: " + node);
Shell.exit (req, context, 6);
return;
}
}
}
if (params.containsKey ("clean"))
{
final Value val = json.value ();
if (val instanceof JSONString)
{
out.print (((JSONString) val).value ());
}
else if (val instanceof JSONNumber || val instanceof JSONNull ||
val instanceof JSONTrue || val instanceof JSONFalse)
{
out.print (json);
}
else
{
if (! quiet) out.println ("json: requested json data cannot be converted to clean output");
Shell.exit (req, context, 7);
return;
}
out.flush ();
}
else
{
out.println (json);
}
Shell.exit (req, context, 0);
}
else
{
Shell.exit (req, context, 1);
}
}
catch (final GraphException e)
{
Log.warn (e);
if (! quiet) out.println ("json: bad json data: " + e);
Shell.exit (req, context, 2);
}
}
}

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