From a43e1a055018aab9590c88c45d8495f99bfb6254 Mon Sep 17 00:00:00 2001
From: ulrich
Date: Mon, 05 Apr 2021 18:39:49 +0000
Subject: [PATCH] Ablageort-Liste
---
src/de/uhilger/mediaz/api/StorageHandler.java | 146 +++++++++++++++++++++++++++++++++---------------
1 files changed, 99 insertions(+), 47 deletions(-)
diff --git a/src/de/uhilger/mediaz/api/StorageHandler.java b/src/de/uhilger/mediaz/api/StorageHandler.java
index f2936eb..8de56fd 100644
--- a/src/de/uhilger/mediaz/api/StorageHandler.java
+++ b/src/de/uhilger/mediaz/api/StorageHandler.java
@@ -1,17 +1,30 @@
/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
+ Mediazentrale - Personal Media Center
+ Copyright (C) 2021 Ulrich Hilger
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as
+ published by the Free Software Foundation, either version 3 of the
+ License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package de.uhilger.mediaz.api;
import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import de.uhilger.mediaz.App;
import de.uhilger.mediaz.Server;
+import static de.uhilger.mediaz.Server.RB_SLASH;
import de.uhilger.mediaz.store.FileStorage;
-import de.uhilger.mediaz.entity.Ablageort;
import de.uhilger.mediaz.entity.Entity;
import java.io.BufferedReader;
import java.io.File;
@@ -19,12 +32,15 @@
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
+import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
- *
- * @author ulrich
+ * HttpHandler fuer die Ablage von Entitaeten der Mediazentrale
+ *
+ * @author Ulrich Hilger
+ * @version 1, 5.4.2021
*/
public class StorageHandler implements HttpHandler {
@@ -32,13 +48,18 @@
/*
-
- HTTP GET: lies einen Ablageort und schreibe JSON
- HTTP PUT: schreibe einen neuen Ablageort auf die Platte
- HTTP POST: schreibe Aenderungen auf die Platte
- HTTP DELETE: loesche den Ablageort
+ Das REST-Muster sieht je Entitaet fuenf Faelle vor (Beispiel Ablageort):
+
+ 1. HTTP GET Ablageort/[Name]: Liefere den Ablageort als JSON
+ 2. HTTP GET Ablageort/: Liefere einer Liste von Ablageorten als JSON
+ 3. HTTP PUT: schreibe einen neuen Ablageort auf die Platte
+ 4. HTTP POST: schreibe Aenderungen auf die Platte
+ 5. HTTP DELETE: loesche den Ablageort
Beispiele:
+
+ HTTP GET an /mz/api/store/Ablageort/
+ liefert eine Liste der Namen vorhandener Ablageorte
HTTP GET an /mz/api/store/Ablageort/Katalog
liest den Ablageort namens "Katalog"
@@ -55,58 +76,64 @@
*/
+ /** Name der HTTP Methode GET */
public static final String HTTP_GET = "GET";
+
+ /** Name der HTTP Methode PUT */
public static final String HTTP_PUT = "PUT";
+
+ /** Name der HTTP Methode POST */
public static final String HTTP_POST = "POST";
+
+ /** Name der HTTP Methode DELETE */
public static final String HTTP_DELETE = "DELETE";
@Override
public void handle(HttpExchange e) throws IOException {
String method = e.getRequestMethod();
- String path = e.getRequestURI().toString();
- String[] elems = path.split(App.getRs(Server.RB_SLASH));
- String type = "";
- String elemName = "";
- String body = "";
- FileStorage fs = new FileStorage(App.getInitParameter(App.getRs(App.RB_AP_CONF)));
+ String response = "";
+ int code = 200;
switch(method) {
case HTTP_GET:
- type = elems[elems.length - 2];
- elemName = elems[elems.length - 1];
- //this.readFromFile(file);
- fs.read(type, elemName);
+ String json = lesen(e);
+ if(json != null) {
+ response = json;
+ } else {
+ response = "nicht gefunden";
+ code = 404;
+ }
break;
case HTTP_PUT:
- type = elems[elems.length - 1];
- elemName = "noch bauen: lesen aus Body";
+ response = aendern(e);
break;
case HTTP_POST:
- neu(e);
+ response = neu(e);
break;
case HTTP_DELETE:
- type = elems[elems.length - 2];
- elemName = elems[elems.length - 1];
+ boolean geloescht = loeschen(e);
+ if(geloescht) {
+ response = "geloescht";
+ } else {
+ response = "nicht geloescht";
+ }
break;
}
-
-
- String response = "Method: " + method + ", Path: " + path +
- ", Type: " + type + ", elemName: " + elemName;
logger.info(response);
- e.sendResponseHeaders(200, response.length());
+ e.sendResponseHeaders(code, response.length());
OutputStream os = e.getResponseBody();
os.write(response.getBytes());
os.close();
}
- private void neu(HttpExchange e) throws IOException {
+ private String neu(HttpExchange e) throws IOException {
String path = e.getRequestURI().toString();
String[] elems = path.split(App.getRs(Server.RB_SLASH));
String type = elems[elems.length - 1];
String body = bodyLesen(e);
+ String filename = "";
FileStorage fs = new FileStorage(App.getInitParameter(App.getRs(App.RB_AP_CONF)));
Gson gson = new Gson();
logger.log(Level.INFO, "type: {0}", type);
@@ -116,20 +143,50 @@
if(antwortObjekt instanceof File) {
File file = (File) antwortObjekt;
logger.log(Level.INFO, "Datei {0} geschrieben.", file.getAbsolutePath());
+ filename = file.getName();
}
+ }
+ return type + FileHandler.STR_BLANK + filename;
+ }
+
+ private String aendern(HttpExchange e) throws IOException {
+ return neu(e); // einstweilen wird einfach ueberschrieben
+ }
+
+ private boolean loeschen(HttpExchange e) {
+ String path = e.getRequestURI().toString();
+ String[] elems = path.split(App.getRs(Server.RB_SLASH));
+ String type = elems[elems.length - 2];
+ String elemName = elems[elems.length - 1];
+ FileStorage fs = new FileStorage(App.getInitParameter(App.getRs(App.RB_AP_CONF)));
+ return fs.delete(type, elemName);
+ }
+
+ private String lesen(HttpExchange e) {
+ String path = e.getRequestURI().toString();
+ String[] elems = path.split(App.getRs(Server.RB_SLASH));
+ FileStorage fs = new FileStorage(App.getInitParameter(App.getRs(App.RB_AP_CONF)));
+ if(path.endsWith(App.getRs(RB_SLASH))) {
+ String type = elems[elems.length - 1];
+ logger.info(type);
+ List list = fs.list(type);
+ return jsonWithEnclosingType(list);
+ } else {
+ String type = elems[elems.length - 2];
+ String elemName = elems[elems.length - 1];
+ return fs.readJson(type, elemName);
}
}
- private void aendern() {
-
- }
-
- private void loeschen() {
-
- }
-
- private Entity lesen() {
- return null;
+ private String jsonWithEnclosingType(Object o) {
+ StringBuilder sb = new StringBuilder();
+ sb.append("{\"");
+ sb.append(o.getClass().getSimpleName());
+ sb.append("\": ");
+ Gson gson = new Gson();
+ sb.append(gson.toJson(o));
+ sb.append("}");
+ return sb.toString();
}
@@ -143,11 +200,6 @@
line = r.readLine();
}
r.close();
- // {"Ablageort":{"name":"test1","ort":"test2","url":"test3"}}
- //String data = sb.toString();
- //data = data.substring(1, data.length() - 1);
- //String json = data.substring(data.indexOf("{"));
- // {"name":"test1","ort":"test2","url":"test3"}
String json = sb.toString();
logger.log(Level.INFO, "json: {0}", json);
return json;
--
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