feat(relay): TOML config file (--config /path/to/relay.toml)

Adds operator-facing TOML configuration to :quartz-relay, with the
section layout deliberately mirroring nostr-rs-relay's config.toml so
existing operators can port across with little churn.

Sections parsed AND enforced today:
  [info]      — NIP-11 doc fields (name, description, contact, pubkey,
                 software, supported_nips, …); replaces the previous
                 hardcoded RelayInfo.default()
  [network]   — host, port, path
  [database]  — in_memory toggle + file path
  [options]   — verify_signatures, require_auth (compose to the right
                 IRelayPolicy stack)

Sections parsed today but NOT YET ENFORCED (forward-compat for the
upcoming rate-limit / authorization work — relay logs a warning when
they're set):
  [limits]         — max_event_bytes, messages_per_sec, …
  [authorization]  — pubkey_whitelist/blacklist, kind_whitelist/blacklist
  [options].reject_future_seconds
  [network].remote_ip_header

CLI flag precedence over the config file is preserved: --host, --port,
--path, --info, --db, --auth, --verify all override the matching field.

Adds:
  - cc.ekblad:4koma 1.2.0 for TOML parsing
  - quartz-relay/config.example.toml as the canonical operator reference
  - 5 unit tests (defaults, full parse, NIP-11 mapping, bundled example
    file, optional sections)

gradle/libs.versions.toml

@@ -82,6 +82,7 @@ core = "1.7.0"
 mavenPublish = "0.36.0"
 sqlite = "2.6.2"
 ktor = "3.4.1"
+fourkoma = "1.2.0"
 
 [libraries]
 abedElazizShe-video-compressor-fork = { group = "com.github.davotoula", name = "LightCompressor-enhanced", version.ref = "lightcompressor-enhanced" }
@@ -179,6 +180,7 @@ okhttpCoroutines = { group = "com.squareup.okhttp3", name = "okhttp-coroutines",
 ktor-server-core = { group = "io.ktor", name = "ktor-server-core", version.ref = "ktor" }
 ktor-server-cio = { group = "io.ktor", name = "ktor-server-cio", version.ref = "ktor" }
 ktor-server-websockets = { group = "io.ktor", name = "ktor-server-websockets", version.ref = "ktor" }
+fourkoma = { module = "cc.ekblad:4koma", version.ref = "fourkoma" }
 secp256k1-kmp-common = { group = "fr.acinq.secp256k1", name = "secp256k1-kmp", version.ref = "secp256k1KmpJniAndroid" }
 secp256k1-kmp-jni-android = { group = "fr.acinq.secp256k1", name = "secp256k1-kmp-jni-android", version.ref = "secp256k1KmpJniAndroid" }
 secp256k1-kmp-jni-jvm = { group = "fr.acinq.secp256k1", name = "secp256k1-kmp-jni-jvm", version.ref = "secp256k1KmpJniAndroid" }

quartz-relay/build.gradle.kts

@@ -42,6 +42,11 @@ dependencies {
     api(libs.ktor.server.cio)
     api(libs.ktor.server.websockets)
 
+    // TOML parsing for the operator config file. Mirrors the section
+    // layout of nostr-rs-relay's config.toml so existing operators can
+    // port their configs nearly verbatim.
+    implementation(libs.fourkoma)
+
     testImplementation(libs.kotlin.test)
     testImplementation(libs.kotlinx.coroutines.test)
     testImplementation(libs.secp256k1.kmp.jni.jvm)

quartz-relay/config.example.toml

@@ -0,0 +1,66 @@
+# Example config for quartz-relay. Section layout mirrors
+# nostr-rs-relay's config.toml so existing operators can port across.
+#
+# Run with:
+#   ./gradlew :quartz-relay:run --args="--config /etc/quartz-relay.toml"
+#
+# CLI flags override individual values: e.g. `--port 8888` wins over
+# `[network].port`.
+
+[info]
+# The wss:// URL clients use to reach this relay (mandatory for NIP-42
+# AUTH challenges). If not set, the relay synthesises one from the
+# [network] section.
+relay_url = "wss://relay.example.com/"
+name = "Example Quartz Relay"
+description = "A quartz-relay deployment."
+contact = "admin@example.com"
+# Operator pubkey (NIP-11). Optional.
+# pubkey = "..."
+# Override the supported NIPs advertised on the NIP-11 endpoint. If
+# omitted, the relay advertises the NIPs it actually implements.
+# supported_nips = [1, 9, 11, 40, 42, 45, 50, 62]
+
+[network]
+host = "0.0.0.0"
+port = 7447
+path = "/"
+# Set when behind a reverse proxy (nginx/Caddy/Cloudflare). Required
+# before any IP-based rate limit means anything. Parsed today, enforced
+# once rate limits land.
+# remote_ip_header = "X-Forwarded-For"
+
+[database]
+# True keeps an in-memory SQLite db (events vanish on restart). Useful
+# for tests; set false + `file = "..."` for persistent storage.
+in_memory = false
+file = "/var/lib/quartz-relay/events.db"
+
+[options]
+# Drop events whose Schnorr signature does not verify. Strongly
+# recommended for any relay accepting traffic from real clients.
+verify_signatures = true
+# Require clients to NIP-42 AUTH before REQ/EVENT/COUNT.
+require_auth = false
+# Reject events whose `created_at` is more than this many seconds in the
+# future. Parsed today, enforced once the matching policy lands.
+# reject_future_seconds = 1800
+
+# --- Sections below are parsed today but NOT YET ENFORCED. They are
+# accepted for forward compatibility — the matching enforcement code is
+# tracked separately. The relay logs a warning for each used section. ---
+
+[limits]
+# max_event_bytes = 131072
+# max_ws_message_bytes = 1048576
+# max_ws_frame_bytes = 1048576
+# messages_per_sec = 10
+# subscriptions_per_min = 60
+# max_subscriptions_per_session = 32
+# max_filters_per_req = 10
+
+[authorization]
+# pubkey_whitelist = []
+# pubkey_blacklist = []
+# kind_whitelist = []
+# kind_blacklist = []

quartz-relay/src/main/kotlin/com/vitorpamplona/quartz/relay/Main.kt

@@ -27,40 +27,65 @@ import com.vitorpamplona.quartz.nip01Core.relay.server.policies.FullAuthPolicy
 import com.vitorpamplona.quartz.nip01Core.relay.server.policies.VerifyPolicy
 import com.vitorpamplona.quartz.nip01Core.store.IEventStore
 import com.vitorpamplona.quartz.nip01Core.store.sqlite.EventStore
+import com.vitorpamplona.quartz.relay.config.RelayConfig
 import java.io.File
 
 /**
- * Standalone entry point. Run with `./gradlew :quartz-relay:run` (when the
- * application plugin is configured) or `java -cp ... Main`.
+ * Standalone entry point.
  *
- * Usage:
- *   --host <addr>      bind address (default 0.0.0.0)
- *   --port <n>         tcp port (default 7447, 0 to autobind)
- *   --path <p>         ws path (default /)
- *   --info <file>      NIP-11 doc file (default: built-in)
- *   --db <file>        sqlite db path (default: in-memory)
- *   --auth             require NIP-42 AUTH for REQ/EVENT/COUNT
- *   --verify           verify event signatures (recommended for any
- *                      relay accepting traffic from real clients)
+ * Run with:
+ *   ./gradlew :quartz-relay:run --args="--config /etc/quartz-relay.toml"
+ * or
+ *   java -cp ... com.vitorpamplona.quartz.relay.MainKt --port 7447 --verify
+ *
+ * Configuration precedence (highest to lowest):
+ *   1. CLI flags (`--host`, `--port`, …)
+ *   2. TOML file passed via `--config <path>`
+ *   3. Built-in defaults (host=0.0.0.0, port=7447, in-memory db, …)
+ *
+ * Sections currently parsed AND enforced: `[info]`, `[network]`,
+ * `[database]`, `[options]`. Sections parsed but not yet enforced
+ * (forward-compat for the rate-limit / authorization work):
+ * `[limits]`, `[authorization]`.
+ *
+ * CLI flags:
+ *   --config <file>    TOML config (see config.example.toml)
+ *   --host <addr>      bind address (default from config or 0.0.0.0)
+ *   --port <n>         tcp port (default from config or 7447, 0 to autobind)
+ *   --path <p>         ws path (default from config or /)
+ *   --info <file>      NIP-11 doc file (overrides [info] section)
+ *   --db <file>        sqlite db path (overrides [database].file)
+ *   --auth             require NIP-42 AUTH (sets options.require_auth = true)
+ *   --verify           verify event signatures (sets options.verify_signatures = true)
  */
 fun main(args: Array<String>) {
     val a = parseArgs(args)
-    val host = a.opt("--host") ?: "0.0.0.0"
-    val port = a.opt("--port")?.toInt() ?: 7447
-    val path = a.opt("--path") ?: "/"
-    val infoFile = a.opt("--info")?.let { File(it) }
-    val dbFile = a.opt("--db")
-    val requireAuth = a.flag("--auth")
-    val verifySigs = a.flag("--verify")
 
-    val urlStr = "ws://$host:$port$path"
-    // For binding 0.0.0.0 we still want to scope the relay to a "public" url
-    // shape for NIP-42 challenge validation; use the host the operator
-    // exposes (--info usually carries the public URL). Fall back to
-    // 127.0.0.1 so localhost smoke tests work.
-    val advertisedUrl = (if (host == "0.0.0.0") "ws://127.0.0.1:$port$path" else urlStr).normalizeRelayUrl()
+    val config: RelayConfig =
+        a
+            .opt("--config")
+            ?.let { RelayConfig.fromFile(File(it)) }
+            ?: RelayConfig()
 
-    val info = infoFile?.let { RelayInfo.fromFile(it) } ?: RelayInfo.default(advertisedUrl)
+    val host = a.opt("--host") ?: config.network.host
+    val port = a.opt("--port")?.toInt() ?: config.network.port
+    val path = a.opt("--path") ?: config.network.path
+
+    val cliInfoFile = a.opt("--info")?.let { File(it) }
+    val dbFile = a.opt("--db") ?: config.database.file?.takeUnless { config.database.in_memory }
+    val requireAuth = a.flag("--auth") || config.options.require_auth
+    val verifySigs = a.flag("--verify") || config.options.verify_signatures
+
+    // Advertised URL: explicit `info.relay_url` wins, then build from
+    // host/port/path. 0.0.0.0 bind → 127.0.0.1 in the URL so NIP-42
+    // challenges are well-formed.
+    val advertisedHost = if (host == "0.0.0.0") "127.0.0.1" else host
+    val advertisedUrl =
+        (config.info.relay_url ?: "ws://$advertisedHost:$port$path").normalizeRelayUrl()
+
+    val info =
+        cliInfoFile?.let { RelayInfo.fromFile(it) }
+            ?: config.resolveInfo(advertisedUrl)
 
     val store: IEventStore = EventStore(dbName = dbFile, relay = advertisedUrl)
 
@@ -72,6 +97,8 @@ fun main(args: Array<String>) {
             else -> { -> EmptyPolicy }
         }
 
+    warnUnenforcedSections(config)
+
     val relay = Relay(advertisedUrl, store, info, policyBuilder)
     val server = LocalRelayServer(relay, host = host, port = port, path = path).start()
 
@@ -83,12 +110,43 @@ fun main(args: Array<String>) {
     )
 
     println("quartz-relay listening on ${server.url}")
-    println("NIP-11 info doc: curl -H 'Accept: application/nostr+json' http://$host:$port$path")
+    println("NIP-11 info doc: curl -H 'Accept: application/nostr+json' http://$advertisedHost:$port$path")
 
     // Park the main thread; shutdown hook handles teardown.
     Thread.currentThread().join()
 }
 
+/** Surface a warning when the operator has set sections we don't yet enforce. */
+private fun warnUnenforcedSections(config: RelayConfig) {
+    val warnings = mutableListOf<String>()
+    val l = config.limits
+    if (l.max_event_bytes != null ||
+        l.max_ws_message_bytes != null ||
+        l.max_ws_frame_bytes != null ||
+        l.messages_per_sec != null ||
+        l.subscriptions_per_min != null ||
+        l.max_subscriptions_per_session != null ||
+        l.max_filters_per_req != null
+    ) {
+        warnings += "[limits] section is parsed but NOT YET ENFORCED — rate limits / message size caps are pending."
+    }
+    val auth = config.authorization
+    if (auth.pubkey_whitelist.isNotEmpty() ||
+        auth.pubkey_blacklist.isNotEmpty() ||
+        auth.kind_whitelist.isNotEmpty() ||
+        auth.kind_blacklist.isNotEmpty()
+    ) {
+        warnings += "[authorization] section is parsed but NOT YET ENFORCED — pubkey/kind allow-deny lists are pending."
+    }
+    if (config.options.reject_future_seconds != null) {
+        warnings += "[options].reject_future_seconds is parsed but NOT YET ENFORCED."
+    }
+    if (config.network.remote_ip_header != null) {
+        warnings += "[network].remote_ip_header is parsed but NOT YET ENFORCED — IP-based limits are pending."
+    }
+    warnings.forEach { System.err.println("warning: $it") }
+}
+
 private class Args(
     private val opts: Map<String, String>,
     private val flags: Set<String>,

quartz-relay/src/main/kotlin/com/vitorpamplona/quartz/relay/config/RelayConfig.kt

@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.relay.config
+
+import cc.ekblad.toml.decode
+import cc.ekblad.toml.tomlMapper
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.normalizeRelayUrl
+import com.vitorpamplona.quartz.nip11RelayInfo.Nip11RelayInformation
+import com.vitorpamplona.quartz.relay.RelayInfo
+import java.io.File
+
+/**
+ * Operator-facing configuration. Section layout matches nostr-rs-relay's
+ * `config.toml` so existing configs can be ported with little churn.
+ *
+ * Every section is optional; values not set fall back to sensible
+ * defaults (or, for fields also exposed on the CLI, the CLI value wins).
+ *
+ * Sections that are parsed but **not yet enforced** by the relay are
+ * marked below; they're accepted so configs remain forward-compatible
+ * once the matching policy is implemented (rate limits, NIP-05, etc.).
+ */
+data class RelayConfig(
+    val info: InfoSection = InfoSection(),
+    val network: NetworkSection = NetworkSection(),
+    val database: DatabaseSection = DatabaseSection(),
+    val options: OptionsSection = OptionsSection(),
+    /** Parsed but not yet enforced. */
+    val limits: LimitsSection = LimitsSection(),
+    /** Parsed but not yet enforced. */
+    val authorization: AuthorizationSection = AuthorizationSection(),
+) {
+    /**
+     * Maps the `[info]` section into a [RelayInfo] used by the NIP-11
+     * endpoint. `relay_url` and CLI overrides take precedence.
+     */
+    fun resolveInfo(advertisedUrl: NormalizedRelayUrl): RelayInfo =
+        RelayInfo(
+            Nip11RelayInformation(
+                name = info.name ?: "quartz-relay",
+                description = info.description ?: "Embedded Nostr relay from the Amethyst quartz library.",
+                pubkey = info.pubkey,
+                contact = info.contact,
+                icon = info.icon,
+                software =
+                    info.software
+                        ?: "https://github.com/vitorpamplona/amethyst/tree/main/quartz-relay",
+                version = info.version ?: "1.08.0",
+                supported_nips =
+                    info.supported_nips?.map(Int::toString)
+                        ?: listOf("1", "9", "11", "40", "42", "45", "50", "62"),
+                privacy_policy = info.privacy_policy,
+                terms_of_service = info.terms_of_service,
+                relay_countries = info.relay_countries,
+                language_tags = info.language_tags,
+                tags = info.tags,
+            ),
+        ).also {
+            // Touch [advertisedUrl] so the parameter isn't unused — we keep
+            // it in the signature because future fields (e.g. self-pubkey
+            // selection, fee URLs) will want it.
+            advertisedUrl.url
+        }
+
+    data class InfoSection(
+        val relay_url: String? = null,
+        val name: String? = null,
+        val description: String? = null,
+        val pubkey: String? = null,
+        val contact: String? = null,
+        val icon: String? = null,
+        val software: String? = null,
+        val version: String? = null,
+        /** NIP numbers as ints (e.g. `[1, 9, 11]`). Stringified at render time. */
+        val supported_nips: List<Int>? = null,
+        val privacy_policy: String? = null,
+        val terms_of_service: String? = null,
+        val relay_countries: List<String>? = null,
+        val language_tags: List<String>? = null,
+        val tags: List<String>? = null,
+    )
+
+    data class NetworkSection(
+        val host: String = "0.0.0.0",
+        val port: Int = 7447,
+        val path: String = "/",
+        /**
+         * When set, the relay reads the client IP from this header
+         * (typically `X-Forwarded-For` behind a reverse proxy). Required
+         * once IP-based rate limits land.
+         */
+        val remote_ip_header: String? = null,
+    )
+
+    data class DatabaseSection(
+        /** True keeps an in-memory SQLite db (default — events vanish on restart). */
+        val in_memory: Boolean = true,
+        /** Filesystem path for a persistent SQLite db. Ignored when [in_memory] is true. */
+        val file: String? = null,
+    )
+
+    data class OptionsSection(
+        /** Reject events whose `created_at` is more than this many seconds in the future. */
+        val reject_future_seconds: Int? = null,
+        /** Require NIP-42 AUTH for REQ/EVENT/COUNT. */
+        val require_auth: Boolean = false,
+        /** Drop events whose Schnorr signature does not verify. */
+        val verify_signatures: Boolean = false,
+    )
+
+    data class LimitsSection(
+        val max_event_bytes: Int? = null,
+        val max_ws_message_bytes: Int? = null,
+        val max_ws_frame_bytes: Int? = null,
+        val messages_per_sec: Int? = null,
+        val subscriptions_per_min: Int? = null,
+        val max_subscriptions_per_session: Int? = null,
+        val max_filters_per_req: Int? = null,
+    )
+
+    data class AuthorizationSection(
+        val pubkey_whitelist: List<String> = emptyList(),
+        val pubkey_blacklist: List<String> = emptyList(),
+        val kind_whitelist: List<Int> = emptyList(),
+        val kind_blacklist: List<Int> = emptyList(),
+    )
+
+    companion object {
+        private val mapper = tomlMapper { }
+
+        /** Parse a TOML string. */
+        fun fromToml(toml: String): RelayConfig = mapper.decode<RelayConfig>(toml)
+
+        /** Load a TOML config file. */
+        fun fromFile(file: File): RelayConfig = mapper.decode<RelayConfig>(file.toPath())
+
+        /**
+         * Returns the URL the relay advertises in NIP-11 and NIP-42
+         * challenges. Picks (in order):
+         *   1. `info.relay_url` from the config
+         *   2. The `network` section's host/port/path (with 0.0.0.0 → 127.0.0.1)
+         *   3. The CLI override (handled in `Main.kt`).
+         */
+        fun advertisedUrl(config: RelayConfig): NormalizedRelayUrl =
+            (
+                config.info.relay_url
+                    ?: defaultUrl(config.network)
+            ).normalizeRelayUrl()
+
+        private fun defaultUrl(net: NetworkSection): String {
+            val host = if (net.host == "0.0.0.0") "127.0.0.1" else net.host
+            return "ws://$host:${net.port}${net.path}"
+        }
+    }
+}

quartz-relay/src/test/kotlin/com/vitorpamplona/quartz/relay/config/RelayConfigTest.kt

@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.relay.config
+
+import java.io.File
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+import kotlin.test.assertTrue
+
+class RelayConfigTest {
+    @Test
+    fun emptyTomlYieldsAllDefaults() {
+        val c = RelayConfig.fromToml("")
+        assertEquals("0.0.0.0", c.network.host)
+        assertEquals(7447, c.network.port)
+        assertEquals("/", c.network.path)
+        assertEquals(true, c.database.in_memory)
+        assertEquals(false, c.options.require_auth)
+        assertEquals(false, c.options.verify_signatures)
+        assertTrue(c.authorization.pubkey_whitelist.isEmpty())
+    }
+
+    @Test
+    fun parsesAllSectionsTogether() {
+        val toml =
+            """
+            [info]
+            relay_url = "wss://relay.example.com/"
+            name = "Example"
+            contact = "ops@example.com"
+            supported_nips = [1, 9, 11, 42]
+
+            [network]
+            host = "127.0.0.1"
+            port = 9988
+            path = "/relay"
+            remote_ip_header = "X-Forwarded-For"
+
+            [database]
+            in_memory = false
+            file = "/var/lib/quartz-relay/events.db"
+
+            [options]
+            verify_signatures = true
+            require_auth = true
+            reject_future_seconds = 1800
+
+            [limits]
+            max_event_bytes = 131072
+            messages_per_sec = 10
+            max_filters_per_req = 12
+
+            [authorization]
+            pubkey_blacklist = ["aaaa", "bbbb"]
+            kind_blacklist = [4, 1059]
+            """.trimIndent()
+
+        val c = RelayConfig.fromToml(toml)
+
+        assertEquals("wss://relay.example.com/", c.info.relay_url)
+        assertEquals("Example", c.info.name)
+        assertEquals(listOf(1, 9, 11, 42), c.info.supported_nips)
+
+        assertEquals("127.0.0.1", c.network.host)
+        assertEquals(9988, c.network.port)
+        assertEquals("/relay", c.network.path)
+        assertEquals("X-Forwarded-For", c.network.remote_ip_header)
+
+        assertEquals(false, c.database.in_memory)
+        assertEquals("/var/lib/quartz-relay/events.db", c.database.file)
+
+        assertEquals(true, c.options.verify_signatures)
+        assertEquals(true, c.options.require_auth)
+        assertEquals(1800, c.options.reject_future_seconds)
+
+        assertEquals(131072, c.limits.max_event_bytes)
+        assertEquals(10, c.limits.messages_per_sec)
+        assertEquals(12, c.limits.max_filters_per_req)
+
+        assertEquals(listOf("aaaa", "bbbb"), c.authorization.pubkey_blacklist)
+        assertEquals(listOf(4, 1059), c.authorization.kind_blacklist)
+    }
+
+    @Test
+    fun supportedNipsRenderedAsStringsInNip11Doc() {
+        val c =
+            RelayConfig.fromToml(
+                """
+                [info]
+                supported_nips = [1, 11, 42]
+                """.trimIndent(),
+            )
+        val info =
+            c.resolveInfo(
+                "ws://127.0.0.1:7447/".let {
+                    com.vitorpamplona.quartz.nip01Core.relay.normalizer.RelayUrlNormalizer
+                        .normalize(it)
+                },
+            )
+        assertEquals(listOf("1", "11", "42"), info.document.supported_nips)
+    }
+
+    @Test
+    fun loadsTheBundledExampleConfigCleanly() {
+        // The example file lives at the module root so operators have a
+        // canonical reference. Read it via a relative path resolved
+        // against the working directory (gradle runs tests from the
+        // module dir).
+        val candidates =
+            listOf(
+                File("config.example.toml"),
+                File("quartz-relay/config.example.toml"),
+            )
+        val example =
+            candidates.firstOrNull { it.exists() }
+                ?: error(
+                    "config.example.toml not found in any of: ${candidates.joinToString { it.absolutePath }}",
+                )
+
+        val c = RelayConfig.fromFile(example)
+
+        assertEquals("wss://relay.example.com/", c.info.relay_url)
+        assertEquals(true, c.options.verify_signatures)
+        assertEquals(false, c.database.in_memory)
+        assertNotNull(c.database.file)
+    }
+
+    @Test
+    fun missingSectionsAreOptional() {
+        val c = RelayConfig.fromToml("[info]\nname = \"only-info\"")
+        assertEquals("only-info", c.info.name)
+        // Defaults preserved for unspecified sections.
+        assertEquals(7447, c.network.port)
+        assertEquals(true, c.database.in_memory)
+    }
+}