Reject duplicate guest documents by hash

src/main/kotlin/com/android/trisolarisserver/config/GuestDocumentSchemaFix.kt

@@ -0,0 +1,41 @@
+package com.android.trisolarisserver.config
+
+import org.springframework.jdbc.core.JdbcTemplate
+import org.springframework.stereotype.Component
+
+@Component
+class GuestDocumentSchemaFix(
+    private val jdbcTemplate: JdbcTemplate
+) : PostgresSchemaFix(jdbcTemplate) {
+
+    override fun runPostgres(jdbcTemplate: JdbcTemplate) {
+        val hasTable = jdbcTemplate.queryForObject(
+            """
+            select count(*)
+            from information_schema.tables
+            where table_name = 'guest_document'
+            """.trimIndent(),
+            Int::class.java
+        ) ?: 0
+        if (hasTable == 0) return
+
+        val hasHash = jdbcTemplate.queryForObject(
+            """
+            select count(*)
+            from information_schema.columns
+            where table_name = 'guest_document'
+              and column_name = 'file_hash'
+            """.trimIndent(),
+            Int::class.java
+        ) ?: 0
+        if (hasHash == 0) {
+            logger.info("Adding file_hash to guest_document table")
+            jdbcTemplate.execute(
+                """
+                alter table guest_document
+                add column file_hash varchar
+                """.trimIndent()
+            )
+        }
+    }
+}