Feature: add postgres support

README.md

@@ -102,11 +102,23 @@ connection:
     # Represents password, which will be used to decode operations.
     password: "test123"
 
-# Represents section used for ObjectStorage API Server temporate storage configuration.
-temporate-storage:
-  # Represents format used for content to be saved.
-  format: "zip"
+# Represents section used for ObjectStorage API Server internal database configuration.
+internal-storage:
+  # Represents provider selected for ObjectStorage internal database. Supported providers are "sqlite3" and "postgres" only.
+  provider: "sqlite3"
+
+  # Represents host for the previously selected ObjectStorage internal database provider, works only for "postgres".
+  # host: "localhost:5432"
+
+  # Represents username for the previously selected ObjectStorage internal database provider.
+  username: "objectstorage_user"
+
+  # Represents password for the previously selected ObjectStorage internal database provider.
+  password: "objectstorage_password"
 
+# Represents section used for ObjectStorage API Server temporate storage configuration. Same compression will be
+# used to upload files to the configured cloud providers.
+temporate-storage:
   # Represents frequency of scheduled operations processing.
   frequency: "*/5 * * * * ?"
 
@@ -118,10 +130,13 @@ backup:
   # Represents frequency of backup operation for selected provider.
   frequency: "0 */5 * * * ?"
 
+  # Represents the highest amount of downloaded backup content versions per each workspace.
+  max-versions: 5
+
 # Represents section used for ObjectStorage API Server diagnostics configuration.
 diagnostics:
   # Enables diagnostics functionality.
-  enabled: false
+  enabled: true
 
   # Represents section used for ObjectStorage diagnostics metrics configuration.
   metrics:
@@ -144,6 +159,9 @@ diagnostics:
     port: 8121
 ```
 
+In the **~/.objectstorage/internal/database** directory there will be located internal database data, if **sqlite3** 
+option is selected as target database.
+
 ### Diagnostics dashboard
 
 For **ObjectStorage API Server** configuration the following section should be modified:

api-server/pom.xml

@@ -100,6 +100,10 @@
             <groupId>io.quarkiverse.jdbc</groupId>
             <artifactId>quarkus-jdbc-sqlite</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-jdbc-postgresql</artifactId>
+        </dependency>
         <dependency>
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-smallrye-jwt</artifactId>

api-server/src/main/java/com/objectstorage/entity/common/ConfigEntity.java

@@ -51,6 +51,55 @@ public static class Security {
     @JsonProperty("connection")
     public Connection connection;
 
+    /**
+     * Represents ObjectStorage internal storage configuration used for internal database setup.
+     */
+    @Getter
+    public static class InternalStorage {
+        /**
+         * Represents all supported providers, which can be used by ObjectStorage internal storage.
+         */
+        @Getter
+        public enum Provider {
+            @JsonProperty("sqlite3")
+            SQLITE3("sqlite3"),
+
+            @JsonProperty("postgres")
+            POSTGRES("postgres");
+
+            private final String value;
+
+            Provider(String value) {
+                this.value = value;
+            }
+
+            public String toString() {
+                return value;
+            }
+        }
+
+        @Valid
+        @NotNull
+        @JsonProperty("provider")
+        public Provider provider;
+
+        @JsonProperty("host")
+        public String host;
+
+        @NotNull
+        @JsonProperty("username")
+        public String username;
+
+        @NotNull
+        @JsonProperty("password")
+        public String password;
+    }
+
+    @Valid
+    @NotNull
+    @JsonProperty("internal-storage")
+    public InternalStorage internalStorage;
+
     /**
      * Represents ObjectStorage API Server configuration used for temporate storage setup.
      */

api-server/src/main/java/com/objectstorage/entity/common/PropertiesEntity.java

@@ -20,6 +20,15 @@ public class PropertiesEntity {
     @ConfigProperty(name = "quarkus.http.port")
     Integer applicationPort;
 
+    @ConfigProperty(name = "database.name")
+    String databaseName;
+
+    @ConfigProperty(name = "liquibase.sqlite3.config")
+    String liquibaseSqlite3Config;
+
+    @ConfigProperty(name = "liquibase.postgres.config")
+    String liquibasePostgresConfig;
+
     @ConfigProperty(name = "content.root.notation")
     String contentRootNotation;
 

api-server/src/main/java/com/objectstorage/exception/ConfigDatabasePropertiesMissingException.java

@@ -0,0 +1,21 @@
+package com.objectstorage.exception;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Formatter;
+
+/**
+ * Represents exception used when configuration file database properties are missing.
+ */
+public class ConfigDatabasePropertiesMissingException extends IOException {
+    public ConfigDatabasePropertiesMissingException() {
+        this("");
+    }
+
+    public ConfigDatabasePropertiesMissingException(Object... message) {
+        super(
+                new Formatter()
+                        .format("Config file database properties are missing: %s", Arrays.stream(message).toArray())
+                        .toString());
+    }
+}

api-server/src/main/java/com/objectstorage/repository/ContentRepository.java

@@ -49,7 +49,7 @@ public void insert(Integer provider, Integer secret, String root) throws Reposit
         try {
             repositoryExecutor.performQuery(query);
 
-        } catch (QueryExecutionFailureException | QueryEmptyResultException e) {
+        } catch (QueryExecutionFailureException e) {
             throw new RepositoryOperationFailureException(e.getMessage());
         }
     }
@@ -77,12 +77,29 @@ public ContentEntity findByProviderAndSecret(Integer provider, Integer secret) t
             throw new RepositoryOperationFailureException(e.getMessage());
         }
 
-        Integer id;
-        String root;
-
         try {
-            id = resultSet.getInt("id");
-            root = resultSet.getString("root");
+            if (resultSet.next()) {
+                try {
+                    Integer id = resultSet.getInt("id");
+                    String root = resultSet.getString("root");
+
+                    try {
+                        resultSet.close();
+                    } catch (SQLException e) {
+                        throw new RepositoryOperationFailureException(e.getMessage());
+                    }
+
+                    return ContentEntity.of(id, provider, secret, root);
+                } catch (SQLException e1) {
+                    try {
+                        resultSet.close();
+                    } catch (SQLException e2) {
+                        throw new RepositoryOperationFailureException(e2.getMessage());
+                    }
+
+                    throw new RepositoryOperationFailureException(e1.getMessage());
+                }
+            }
         } catch (SQLException e1) {
             try {
                 resultSet.close();
@@ -99,7 +116,7 @@ public ContentEntity findByProviderAndSecret(Integer provider, Integer secret) t
             throw new RepositoryOperationFailureException(e.getMessage());
         }
 
-        return ContentEntity.of(id, provider, secret, root);
+        return null;
     }
 
     /**
@@ -167,7 +184,7 @@ public void deleteByProviderAndSecret(Integer provider, Integer secret) throws R
                             provider,
                             secret));
 
-        } catch (QueryExecutionFailureException | QueryEmptyResultException e) {
+        } catch (QueryExecutionFailureException e) {
             throw new RepositoryOperationFailureException(e.getMessage());
         }
     }