From 76a6ccc55cbd06deba6bf96e28fa6aa0b538d6b4 Mon Sep 17 00:00:00 2001
From: Hylke van der Schaaf <hylke.vanderschaaf@iosb.fraunhofer.de>
Date: Thu, 16 Jun 2022 13:13:31 +0200
Subject: [PATCH] [OData] Add support for metadata sub parameter in format
 parameter

---
 .../iosb/ilt/frostserver/query/Metadata.java  | 11 ++++++
 .../plugin/odata/PluginResultFormatOData.java | 36 +++++++++++++++++--
 2 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/FROST-Server.Core.Model/src/main/java/de/fraunhofer/iosb/ilt/frostserver/query/Metadata.java b/FROST-Server.Core.Model/src/main/java/de/fraunhofer/iosb/ilt/frostserver/query/Metadata.java
index 4910fbe67..db3578aaf 100644
--- a/FROST-Server.Core.Model/src/main/java/de/fraunhofer/iosb/ilt/frostserver/query/Metadata.java
+++ b/FROST-Server.Core.Model/src/main/java/de/fraunhofer/iosb/ilt/frostserver/query/Metadata.java
@@ -23,6 +23,17 @@ public enum Metadata {
 
     public static final Metadata DEFAULT = Metadata.FULL;
 
+    public static Metadata lookup(String metadata, Metadata dflt) {
+        if (metadata == null) {
+            return DEFAULT;
+        }
+        try {
+            return lookup(metadata);
+        } catch (IllegalArgumentException e) {
+            return dflt;
+        }
+    }
+
     public static Metadata lookup(String metadata) {
         if (metadata == null) {
             return DEFAULT;
diff --git a/Plugins/OData/src/main/java/de/fraunhofer/iosb/ilt/frostserver/plugin/odata/PluginResultFormatOData.java b/Plugins/OData/src/main/java/de/fraunhofer/iosb/ilt/frostserver/plugin/odata/PluginResultFormatOData.java
index fd54c386f..3fa46f24b 100644
--- a/Plugins/OData/src/main/java/de/fraunhofer/iosb/ilt/frostserver/plugin/odata/PluginResultFormatOData.java
+++ b/Plugins/OData/src/main/java/de/fraunhofer/iosb/ilt/frostserver/plugin/odata/PluginResultFormatOData.java
@@ -32,14 +32,19 @@
 import de.fraunhofer.iosb.ilt.frostserver.plugin.odata.serialize.EntityWrapper;
 import de.fraunhofer.iosb.ilt.frostserver.plugin.odata.serialize.JsonWriterOdata40;
 import de.fraunhofer.iosb.ilt.frostserver.plugin.odata.serialize.JsonWriterOdata401;
+import de.fraunhofer.iosb.ilt.frostserver.query.Metadata;
 import de.fraunhofer.iosb.ilt.frostserver.query.Query;
 import de.fraunhofer.iosb.ilt.frostserver.service.PluginResultFormat;
+import de.fraunhofer.iosb.ilt.frostserver.service.ServiceRequest;
 import de.fraunhofer.iosb.ilt.frostserver.settings.CoreSettings;
 import static de.fraunhofer.iosb.ilt.frostserver.util.Constants.CONTENT_TYPE_APPLICATION_JSON;
+import de.fraunhofer.iosb.ilt.frostserver.util.StringHelper;
+import static de.fraunhofer.iosb.ilt.frostserver.util.StringHelper.isNullOrEmpty;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Map;
+import org.apache.commons.lang3.StringUtils;
 import org.geojson.GeoJsonObject;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -53,7 +58,13 @@ public class PluginResultFormatOData implements PluginResultFormat {
     /**
      * The "name" of the OData resultFormatter.
      */
-    public static final String FORMAT_NAME_ODATA = "ODATA-JSON";
+    public static final String FORMAT_NAME_ODATA_JSON = "ODATA-JSON";
+    public static final String FORMAT_PARAM_EXP_DECIMALS = "ExponentialDecimals";
+    public static final String FORMAT_PARAM_IEEE754 = "IEEE754Compatible";
+    public static final String FORMAT_PARAM_METADATA401 = "metadata";
+    public static final String FORMAT_PARAM_METADATA40 = "odata.metadata";
+    public static final String FORMAT_PARAM_STREAMING401 = "streaming";
+    public static final String FORMAT_PARAM_STREAMING40 = "odata.streaming";
 
     private CoreSettings settings;
 
@@ -75,7 +86,28 @@ public Collection<Version> getVersions() {
 
     @Override
     public Collection<String> getFormatNames() {
-        return Arrays.asList(PluginResultFormat.FORMAT_NAME_DEFAULT, FORMAT_NAME_ODATA, FORMAT_NAME_EMPTY);
+        return Arrays.asList(PluginResultFormat.FORMAT_NAME_DEFAULT,
+                FORMAT_NAME_ODATA_JSON,
+                FORMAT_NAME_EMPTY
+        );
+    }
+
+    @Override
+    public void parsedPathAndQuery(CoreSettings settings, ServiceRequest request, Query query) {
+        String format = query.getFormat();
+        if (isNullOrEmpty(format)) {
+            return;
+        }
+        String[] formatSplit = StringUtils.split(format, ';');
+        if (CONTENT_TYPE_APPLICATION_JSON.equalsIgnoreCase(formatSplit[0])) {
+            query.setFormat(FORMAT_NAME_ODATA_JSON);
+            if (formatSplit.length > 1) {
+                String[] paramSplit = StringUtils.split(formatSplit[1], '=');
+                if (paramSplit != null && paramSplit.length == 2 && FORMAT_PARAM_METADATA401.equalsIgnoreCase(paramSplit[0]) || FORMAT_PARAM_METADATA40.equalsIgnoreCase(paramSplit[0])) {
+                    query.setMetadata(Metadata.lookup(paramSplit[1], Metadata.DEFAULT));
+                }
+            }
+        }
     }
 
     @Override