added registration function

~4h work

.idea/dataSources.xml

@@ -13,17 +13,5 @@
       </jdbc-additional-properties>
       <working-dir>$ProjectFileDir$</working-dir>
     </data-source>
-    <data-source source="LOCAL" name="postgres@localhost" uuid="ef2058ed-3abf-42cf-b611-7b52e2f2b2ae">
-      <driver-ref>postgresql</driver-ref>
-      <synchronize>true</synchronize>
-      <jdbc-driver>org.postgresql.Driver</jdbc-driver>
-      <jdbc-url>jdbc:postgresql://localhost:5432/postgres</jdbc-url>
-      <jdbc-additional-properties>
-        <property name="com.intellij.clouds.kubernetes.db.host.port" />
-        <property name="com.intellij.clouds.kubernetes.db.enabled" value="false" />
-        <property name="com.intellij.clouds.kubernetes.db.container.port" />
-      </jdbc-additional-properties>
-      <working-dir>$ProjectFileDir$</working-dir>
-    </data-source>
   </component>
 </project>

.idea/libraries/postgresql.xml

@@ -0,0 +1,11 @@
+<component name="libraryTable">
+  <library name="postgresql" type="repository">
+    <properties maven-id="org.postgresql:postgresql:42.7.1" />
+    <CLASSES>
+      <root url="jar://$PROJECT_DIR$/lib/postgresql-42.7.1.jar!/" />
+      <root url="jar://$PROJECT_DIR$/lib/checker-qual-3.41.0.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/misc.xml

@@ -9,6 +9,54 @@
     </option>
     <option name="workspaceImportForciblyTurnedOn" value="true" />
   </component>
+  <component name="NullableNotNullManager">
+    <option name="myDefaultNullable" value="org.jetbrains.annotations.Nullable" />
+    <option name="myDefaultNotNull" value="lombok.NonNull" />
+    <option name="myNullables">
+      <value>
+        <list size="16">
+          <item index="0" class="java.lang.String" itemvalue="org.jspecify.annotations.Nullable" />
+          <item index="1" class="java.lang.String" itemvalue="com.android.annotations.Nullable" />
+          <item index="2" class="java.lang.String" itemvalue="io.reactivex.rxjava3.annotations.Nullable" />
+          <item index="3" class="java.lang.String" itemvalue="androidx.annotation.RecentlyNullable" />
+          <item index="4" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NullableDecl" />
+          <item index="5" class="java.lang.String" itemvalue="org.jetbrains.annotations.Nullable" />
+          <item index="6" class="java.lang.String" itemvalue="androidx.annotation.Nullable" />
+          <item index="7" class="java.lang.String" itemvalue="org.eclipse.jdt.annotation.Nullable" />
+          <item index="8" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.Nullable" />
+          <item index="9" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
+          <item index="10" class="java.lang.String" itemvalue="jakarta.annotation.Nullable" />
+          <item index="11" class="java.lang.String" itemvalue="javax.annotation.CheckForNull" />
+          <item index="12" class="java.lang.String" itemvalue="javax.annotation.Nullable" />
+          <item index="13" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.qual.Nullable" />
+          <item index="14" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NullableType" />
+          <item index="15" class="java.lang.String" itemvalue="io.reactivex.annotations.Nullable" />
+        </list>
+      </value>
+    </option>
+    <option name="myNotNulls">
+      <value>
+        <list size="16">
+          <item index="0" class="java.lang.String" itemvalue="androidx.annotation.RecentlyNonNull" />
+          <item index="1" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.qual.NonNull" />
+          <item index="2" class="java.lang.String" itemvalue="org.jspecify.annotations.NonNull" />
+          <item index="3" class="java.lang.String" itemvalue="jakarta.annotation.Nonnull" />
+          <item index="4" class="java.lang.String" itemvalue="io.reactivex.annotations.NonNull" />
+          <item index="5" class="java.lang.String" itemvalue="androidx.annotation.NonNull" />
+          <item index="6" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NonNullType" />
+          <item index="7" class="java.lang.String" itemvalue="lombok.NonNull" />
+          <item index="8" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
+          <item index="9" class="java.lang.String" itemvalue="io.reactivex.rxjava3.annotations.NonNull" />
+          <item index="10" class="java.lang.String" itemvalue="com.android.annotations.NonNull" />
+          <item index="11" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
+          <item index="12" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NonNullDecl" />
+          <item index="13" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
+          <item index="14" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />
+          <item index="15" class="java.lang.String" itemvalue="org.eclipse.jdt.annotation.NonNull" />
+        </list>
+      </value>
+    </option>
+  </component>
   <component name="ProjectRootManager" version="2" languageLevel="JDK_20" default="true" project-jdk-name="20" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>

src/at/nanopenguin/mtcg/application/User.java

@@ -1,5 +1,20 @@
 package at.nanopenguin.mtcg.application;
 
+import at.nanopenguin.mtcg.application.service.schemas.UserCredentials;
+import at.nanopenguin.mtcg.db.DbQuery;
+import at.nanopenguin.mtcg.db.SqlCommand;
+import at.nanopenguin.mtcg.db.Table;
+
+import java.sql.SQLException;
+
 public class User {
+    public static int create(UserCredentials userCredentials) throws SQLException {
+        return DbQuery.builder()
+                .command(SqlCommand.INSERT)
+                .table(Table.USERS)
+                .parameter("username", userCredentials.username())
+                .parameter("password", userCredentials.password())
+                .executeUpdate();
 
     }
+}

src/at/nanopenguin/mtcg/application/service/UserService.java

@@ -1,13 +1,15 @@
 package at.nanopenguin.mtcg.application.service;
 
+import at.nanopenguin.mtcg.application.User;
+import at.nanopenguin.mtcg.application.service.schemas.UserCredentials;
 import at.nanopenguin.mtcg.http.HttpMethod;
 import at.nanopenguin.mtcg.http.HttpRequest;
 import at.nanopenguin.mtcg.http.HttpStatus;
 import at.nanopenguin.mtcg.http.Response;
-
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.ObjectWriter;
+
+import java.sql.SQLException;
 
 public class UserService implements Service {
 
@@ -22,7 +24,10 @@ public class UserService implements Service {
             if (request.getPath().split("/")[1].equals("users")) {
                 return switch (request.getMethod()) {
                     case GET -> new Response(HttpStatus.NOT_IMPLEMENTED);
-                    case POST -> new Response(HttpStatus.NOT_IMPLEMENTED); // new ObjectMapper().readValue(request.getBody(), UserCredentials.class);
+                    case POST -> {
+                        int success = User.create(new ObjectMapper().readValue(request.getBody(), UserCredentials.class));
+                        yield new Response(success > 0 ? HttpStatus.CREATED : HttpStatus.CONFLICT);
+                    }
                     case PUT -> new Response(HttpStatus.NOT_IMPLEMENTED); // new ObjectMapper().readValue(request.getBody(), UserData.class);
                     default -> new Response(HttpStatus.NOT_FOUND);
                 };
@@ -32,6 +37,9 @@ public class UserService implements Service {
         }
         catch (ArrayIndexOutOfBoundsException e) {
             return new Response(HttpStatus.BAD_REQUEST);
+        } catch (SQLException e) {
+            System.out.println(e.getMessage());
+            return new Response(HttpStatus.INTERNAL);
         }
     }
 }

src/at/nanopenguin/mtcg/db/DbQuery.java

@@ -11,7 +11,7 @@ import java.util.stream.Collectors;
 
 @Builder
 public final class DbQuery {
-    private static final String connectionString = "jdbc:postgres://localhost:5432/mydb?user=postgres&password=postgres";
+    private static final String connectionString = "jdbc:postgresql://localhost:5432/mydb?user=postgres&password=postgres";
 
     @NonNull
     private final SqlCommand command;
@@ -61,7 +61,8 @@ public final class DbQuery {
                     .filter(columnName -> columnName.matches("[a-zA-Z0-9_]+"))
                     .collect(Collectors.joining(", "));
 
-            String sql = String.format("INSERT INTO %s (%s) VALUES (%s);", table.table, columns, String.join(", ", Collections.nCopies(this.parameters.size(), "?")));
+            String sql = String.format("INSERT INTO %s (%s) VALUES (%s) ON CONFLICT DO NOTHING;", table.table, columns, String.join(", ", Collections.nCopies(this.parameters.size(), "?")));
+            // on conflict return int equals 0
 
             try (PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
                 int i = 1;