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package org.jooby.handlers;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.NoSuchElementException;

import org.jooby.Asset;
import org.jooby.Env;
import org.jooby.Request;
import org.jooby.Response;
import org.jooby.Route;

import com.google.common.io.CharStreams;

/**
 * 

server side include

*

* Custom {@link AssetHandler} with server side include function. *

* *

usage

* *
{@code
 * {
 *   get("/static/**", new SSIHandler());
 * }
 * }
* *

* Request to /static/index.html: *

* *
 * <html>
 * <-- /static/chunk.html -->
 * </html>
 * 
* *

* The {@link SSIHandler} will resolve and insert the content of /static/chunk.html. *

* *

delimiters

*

* Default delimiter are: <-- and -->. You can override this using * {@link #delimiters(String, String)} function: *

* *
{@code
 * {
 *   get("/static/**", new SSIHandler().delimiters("{{", "}}");
 * }
 * }
* * @author edgar * @since 1.1.0 */ public class SSIHandler extends AssetHandler { private String startDelimiter = ""; /** *

* Creates a new {@link SSIHandler}. The location pattern can be one of. *

* * Given / like in assets("/assets/**", "/") with: * *
   *   GET /assets/js/index.js it translates the path to: /assets/js/index.js
   * 
* * Given /assets like in assets("/js/**", "/assets") with: * *
   *   GET /js/index.js it translate the path to: /assets/js/index.js
   * 
* * Given /META-INF/resources/webjars/{0} like in * assets("/webjars/**", "/META-INF/resources/webjars/{0}") with: * *
   *   GET /webjars/jquery/2.1.3/jquery.js it translate the path to: /META-INF/resources/webjars/jquery/2.1.3/jquery.js
   * 
* * @param pattern Pattern to locate static resources. */ public SSIHandler(final String pattern) { super(pattern); } /** *

* Creates a new {@link SSIHandler}. Location pattern is set to: /. *

*/ public SSIHandler() { this("/"); } /** * Set/override delimiters. * * @param start Start delimiter. * @param end Stop/end delimiter. * @return This handler. */ public SSIHandler delimiters(final String start, final String end) { this.startDelimiter = start; this.endDelimiter = end; return this; } @Override protected void send(final Request req, final Response rsp, final Asset asset) throws Throwable { Env env = req.require(Env.class); CharSequence text = process(env, text(asset.stream())); rsp.type(asset.type()) .send(text); } private String process(final Env env, final String src) { return env.resolver() .delimiters(startDelimiter, endDelimiter) .source(key -> process(env, file(key))) .ignoreMissing() .resolve(src); } private String file(final String key) { String file = Route.normalize(key.trim()); return text(getClass().getResourceAsStream(file)); } private String text(final InputStream stream) { try (InputStream in = stream) { return CharStreams.toString(new InputStreamReader(stream, StandardCharsets.UTF_8)); } catch (IOException | NullPointerException x) { throw new NoSuchElementException(); } } }




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