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refactor local web server handler class
- create handler package - add handler for own plants - contributes to #81
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5 changes: 5 additions & 0 deletions
5
app/src/main/java/eu/quelltext/mundraub/map/handler/ErrorHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| package eu.quelltext.mundraub.map.handler; | ||
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| public interface ErrorHandler { | ||
| void handleError(Exception e); | ||
| } |
37 changes: 37 additions & 0 deletions
37
app/src/main/java/eu/quelltext/mundraub/map/handler/PlantCollectionHandler.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,37 @@ | ||
| package eu.quelltext.mundraub.map.handler; | ||
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| import org.json.JSONArray; | ||
| import org.json.JSONException; | ||
| import org.json.JSONObject; | ||
| import org.nanohttpd.protocols.http.IHTTPSession; | ||
| import org.nanohttpd.protocols.http.response.Response; | ||
| import org.nanohttpd.protocols.http.response.Status; | ||
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| import java.io.UnsupportedEncodingException; | ||
| import java.util.List; | ||
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| import eu.quelltext.mundraub.plant.Plant; | ||
| import eu.quelltext.mundraub.plant.PlantCollection; | ||
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| public class PlantCollectionHandler extends URIHandler { | ||
| private final PlantCollection plants; | ||
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| public PlantCollectionHandler(String uri, PlantCollection plants, ErrorHandler errorHandler) { | ||
| super(uri, errorHandler); | ||
| this.plants = plants; | ||
| } | ||
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| @Override | ||
| public Response respondTo(IHTTPSession input) throws JSONException, UnsupportedEncodingException { | ||
| List<Plant> plantList = plants.all(); | ||
| JSONArray json = new JSONArray(); | ||
| for (Plant plant: plantList) { | ||
| JSONObject plantJSON = plant.toJSON(); | ||
| json.put(plantJSON); | ||
| } | ||
| String string = json.toString(); | ||
| byte[] bytes = string.getBytes("UTF-8"); | ||
| Response result = Response.newFixedLengthResponse(Status.OK, "application/json", bytes); | ||
| return result; | ||
| } | ||
| } |
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50
app/src/main/java/eu/quelltext/mundraub/map/handler/TilesHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| package eu.quelltext.mundraub.map.handler; | ||
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| import org.nanohttpd.protocols.http.IHTTPSession; | ||
| import org.nanohttpd.protocols.http.NanoHTTPD; | ||
| import org.nanohttpd.protocols.http.response.Response; | ||
| import org.nanohttpd.protocols.http.response.Status; | ||
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| import eu.quelltext.mundraub.error.Logger; | ||
| import eu.quelltext.mundraub.map.MundraubMapAPIForApp; | ||
| import eu.quelltext.mundraub.map.TilesCache; | ||
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| public class TilesHandler extends URIHandler { | ||
| private final Logger.Log log; | ||
| private MundraubMapAPIForApp mundraubMapAPIForApp; | ||
| private final TilesCache cache; | ||
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| public TilesHandler(MundraubMapAPIForApp mundraubMapAPIForApp, String uri, TilesCache cache, ErrorHandler errorHandler, Logger.Log log) { | ||
| super(uri, errorHandler); | ||
| this.mundraubMapAPIForApp = mundraubMapAPIForApp; | ||
| this.cache = cache; | ||
| this.log = log; | ||
| } | ||
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| @Override | ||
| public boolean wantsToServeURI(String uri) { | ||
| return uri.startsWith(baseUri()); | ||
| } | ||
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| public Response respondTo(IHTTPSession input) throws Exception { | ||
| String[] zyx = input.getUri().substring(this.baseUri().length()).split("/"); | ||
| if (zyx.length < 3) { | ||
| return Response.newFixedLengthResponse(Status.INTERNAL_ERROR, NanoHTTPD.MIME_PLAINTEXT, "I need " + baseUri() + "z/y/x"); | ||
| } | ||
| int x = Integer.parseInt(zyx[zyx.length - 1]); | ||
| int y = Integer.parseInt(zyx[zyx.length - 2]); | ||
| int z = Integer.parseInt(zyx[zyx.length - 3]); | ||
| TilesCache.Tile tile = cache.getTileAt(x, y, z); | ||
| if (tile.isCached()) { | ||
| log.d("handle tile", 200 + ": " + z + "/" + y + "/" + x); | ||
| Response response = Response.newFixedLengthResponse(Status.OK, tile.contentType(), tile.bytes()); | ||
| response.addHeader("Cache-Control", "no-store, must-revalidate"); // no cache from https://stackoverflow.com/a/2068407 | ||
| return response; | ||
| } else { | ||
| log.d("handle tile", 307 + ": " + z + "/" + y + "/" + x + " -> " + tile.url()); | ||
| Response response = Response.newFixedLengthResponse(Status.TEMPORARY_REDIRECT, NanoHTTPD.MIME_PLAINTEXT, "Image not found."); | ||
| response.addHeader("Location", tile.url()); | ||
| return response; | ||
| } | ||
| } | ||
| } |
64 changes: 64 additions & 0 deletions
64
app/src/main/java/eu/quelltext/mundraub/map/handler/URIHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| package eu.quelltext.mundraub.map.handler; | ||
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| import org.apache.commons.lang3.exception.ExceptionUtils; | ||
| import org.nanohttpd.protocols.http.IHTTPSession; | ||
| import org.nanohttpd.protocols.http.NanoHTTPD; | ||
| import org.nanohttpd.protocols.http.request.Method; | ||
| import org.nanohttpd.protocols.http.response.Response; | ||
| import org.nanohttpd.protocols.http.response.Status; | ||
| import org.nanohttpd.util.IHandler; | ||
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| public class URIHandler implements IHandler<IHTTPSession, Response> { | ||
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| private final String uri; | ||
| private final ErrorHandler errorHandler; | ||
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| public URIHandler(String uri,ErrorHandler errorHandler) { | ||
| this.uri = uri; | ||
| this.errorHandler = errorHandler; | ||
| } | ||
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| @Override | ||
| public Response handle(IHTTPSession input) { | ||
| if (wantsToServe(input)) { | ||
| Response response; | ||
| try { | ||
| response = respondTo(input); | ||
| } catch (Exception e) { | ||
| response = handleError(e); | ||
| } | ||
| response.addHeader("Access-Control-Allow-Origin", "*"); // allow JavaScript to access the content | ||
| return response; | ||
| } | ||
| return null; | ||
| } | ||
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| // this should be overwritten | ||
| public Response respondTo(IHTTPSession input) throws Exception { | ||
| return null; | ||
| } | ||
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| public boolean wantsToServe(IHTTPSession input) { | ||
| return wantsToHandleMethod(input.getMethod()) && | ||
| wantsToServeURI(input.getUri()); | ||
| } | ||
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| public boolean wantsToServeURI(String uri) { | ||
| return uri.equals(this.uri); | ||
| } | ||
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| public boolean wantsToHandleMethod(Method method) { | ||
| return method == Method.GET; | ||
| } | ||
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| public Response handleError(Exception e) { | ||
| errorHandler.handleError(e); | ||
| String msg = "<html><body><h1>500 Internal server error</h1>\n" + | ||
| "<pre>" + ExceptionUtils.getStackTrace(e) + "</pre></body></html>"; | ||
| return Response.newFixedLengthResponse(Status.INTERNAL_ERROR, NanoHTTPD.MIME_HTML, msg); | ||
| } | ||
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| protected String baseUri() { | ||
| return uri; | ||
| } | ||
| } |
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