WIP: start work on aquatic_http_private

aquatic_http_private/README.md

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+# aquatic_private
+
+## Setup
+
+Create user:
+
+```sql
+CREATE DATABASE aquatic;
+CREATE USER 'aquatic'@localhost IDENTIFIED BY 'aquatic';
+GRANT EXECUTE ON PROCEDURE aquatic.aquatic_announce_v1 TO 'aquatic'@localhost;
+FLUSH PRIVILEGES;
+```
+
+Create stored procedure (`OR REPLACE` keeps privileges in place and is supported by MariaDB since 10.1.3):
+
+```sql
+CREATE OR REPLACE PROCEDURE aquatic_announce_v1 (
+    IN p_source_ip VARBINARY(16),
+    IN p_source_port SMALLINT,
+    IN p_user_agent TEXT,
+    IN p_user_token VARCHAR(255),
+    IN p_info_hash CHAR(40),
+    IN p_peer_id CHAR(40),
+    IN p_event VARCHAR(9),
+    IN p_uploaded BIGINT,
+    IN p_downloaded BIGINT,
+    OUT p_announce_allowed BOOLEAN,
+    OUT p_failure_reason TEXT,
+    OUT p_warning_message TEXT
+)
+MODIFIES SQL DATA
+BEGIN
+    SELECT true INTO p_announce_allowed;
+END
+```
+
+Create `.env` file:
+
+```sh
+DATABASE_URL="mysql://aquatic:aquatic@localhost/aquatic"
+```