com.wiris.plugin.dispatchers.GetMathMLDispatcher Maven / Gradle / Ivy

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package com.wiris.plugin.dispatchers;

import com.wiris.plugin.LibWIRIS;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringReader;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.wiris.plugin.storage.StorageAndCache;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

import java.net.URL;

import java.util.Iterator;
import java.util.Properties;


public abstract class GetMathMLDispatcher {
    public static void dispatch(Properties config, HttpServletRequest request, HttpServletResponse response, 
                                StorageAndCache storage) throws IOException {
        response.setContentType("text/plain; charset=utf-8");
        String digest = null;
        String md5Parameter = request.getParameter("md5");

        if (md5Parameter != null && md5Parameter.length() == 32) { // Support for "generic simple" integration.
            digest = md5Parameter;
        } else {
            String digestParameter = request.getParameter("digest");

            if (digestParameter != null) { // Support for future integrations (where maybe they aren't using md5 sums).
                digest = digestParameter;
            }
        }

        PrintWriter out = response.getWriter();

        if (digest != null) {
            String content = storage.decodeDigest(digest);

            if (content != null) {
                if (content.startsWith("<")) {
                    BufferedReader fileBufferedReader = new BufferedReader(new StringReader(content));
                    String line;

                    if ((line = fileBufferedReader.readLine()) != null) {
                        out.print(line);
                    }
                } else {
                    Properties formula = new Properties();
                    formula.load(new ByteArrayInputStream(content.getBytes("UTF-8")));
                    String mathml = formula.getProperty("mml");

                    if (mathml != null) {
                        out.print(mathml);
                    }
                }
            } else {
                out.print("Error: formula not found.");
            }
        } else {
            String latex = request.getParameter("latex");

            if (latex != null) {
                String urlString = config.getProperty("wirislatextomathmlurl");
                URL url;

                if (urlString != null) {
                    url = new URL(urlString);
                } else {
                    url = LibWIRIS.getImageServiceURL(config, "latex2mathml");
                }

                Properties properties = new Properties();
                properties.setProperty("latex", latex);

                try {
                    InputStream inputStream = LibWIRIS.getContents(url, properties, LibWIRIS.getReferer(request));
                    ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
                    LibWIRIS.flow(inputStream, dataStream);
                    out.print(dataStream.toString("UTF-8"));
                } catch (Exception e) {
                    out.print("Error: could not connect to the latex translator service.");
                }
            } else {
                out.print("Error: no digest or latex has been sent.");
            }
        }

        out.close();
    }
}