Add support for anonymous sign in

GoTrue/src/commonMain/kotlin/io/github/jan/supabase/gotrue/Auth.kt

@@ -23,6 +23,7 @@ import io.github.jan.supabase.plugins.MainPlugin
 import io.github.jan.supabase.plugins.SupabasePluginProvider
 import io.ktor.client.plugins.HttpRequestTimeoutException
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.serialization.json.JsonObject
 
 /**
  * Plugin to interact with the Supabase Auth API
@@ -127,6 +128,17 @@ sealed interface Auth : MainPlugin<AuthConfig>, CustomSerializationPlugin {
         config: (C.() -> Unit)? = null
     )
 
+    /**
+     * Signs in the user without any credentials. This will create a new user session with a new access token.
+     *
+     * If you want to upgrade this anonymous user to a real user, use [linkIdentity] to link an OAuth identity or [modifyUser] to add an email or phone.
+     *
+     * @param data Extra data for the user
+     * @param captchaToken The captcha token to use
+     */
+    @SupabaseExperimental
+    suspend fun signInAnonymously(data: JsonObject? = null, captchaToken: String? = null)
+
     /**
      * Links an OAuth Identity to an existing user.
      *

GoTrue/src/commonMain/kotlin/io/github/jan/supabase/gotrue/AuthExtensions.kt

@@ -1,7 +1,9 @@
 package io.github.jan.supabase.gotrue
 
+import io.github.jan.supabase.encodeToJsonElement
 import io.github.jan.supabase.gotrue.user.UserSession
 import io.github.jan.supabase.logging.d
+import kotlinx.serialization.json.jsonObject
 
 internal fun noDeeplinkError(arg: String): Nothing = error("""
         Trying to use a deeplink as a redirect url, but no deeplink $arg is set in the GoTrueConfig.
@@ -34,6 +36,7 @@ fun Auth.parseSessionFromFragment(fragment: String): UserSession {
     val type = sessionParts["type"] ?: ""
     val providerToken = sessionParts["provider_token"]
     val providerRefreshToken = sessionParts["provider_refresh_token"]
+
     return UserSession(
         accessToken = accessToken,
         refreshToken = refreshToken,
@@ -51,4 +54,14 @@ fun Auth.parseSessionFromFragment(fragment: String): UserSession {
  * @param url The url to parse the session from
  * @return The parsed session. Note that the user will be null, but you can retrieve it using [Auth.retrieveUser]
  */
-fun Auth.parseSessionFromUrl(url: String): UserSession = parseSessionFromFragment(url.substringAfter("#"))
+fun Auth.parseSessionFromUrl(url: String): UserSession = parseSessionFromFragment(url.substringAfter("#"))
+
+/**
+ * Signs in the user without any credentials. This will create a new user session with a new access token.
+ *
+ * If you want to upgrade this anonymous user to a real user, use [Auth.linkIdentity] to link an OAuth identity or [Auth.modifyUser] to add an email or phone.
+ *
+ * @param data Extra data for the user
+ * @param captchaToken The captcha token to use
+ */
+suspend inline fun <reified T : Any> Auth.signInAnonymously(data: T, captchaToken: String? = null) = signInAnonymously(serializer.encodeToJsonElement(data).jsonObject, captchaToken)

GoTrue/src/commonMain/kotlin/io/github/jan/supabase/gotrue/AuthImpl.kt

@@ -43,6 +43,7 @@ import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
 import kotlinx.datetime.Clock
+import kotlinx.serialization.json.JsonObject
 import kotlinx.serialization.json.JsonObjectBuilder
 import kotlinx.serialization.json.buildJsonObject
 import kotlinx.serialization.json.encodeToJsonElement
@@ -111,6 +112,19 @@ internal class AuthImpl(
         importSession(it, source = SessionSource.SignIn(provider))
     }, redirectUrl, config)
 
+    override suspend fun signInAnonymously(data: JsonObject?, captchaToken: String?) {
+        val response = api.postJson("signup", buildJsonObject {
+            data?.let { put("data", it) }
+            captchaToken?.let {
+                putJsonObject("gotrue_meta_security") {
+                    put("captcha_token", captchaToken)
+                }
+            }
+        })
+        val session = response.safeBody<UserSession>()
+        importSession(session, source = SessionSource.AnonymousSignIn)
+    }
+
     override suspend fun <C, R, Provider : AuthProvider<C, R>> signUpWith(
         provider: Provider,
         redirectUrl: String?,

GoTrue/src/commonMain/kotlin/io/github/jan/supabase/gotrue/SessionStatus.kt

@@ -51,6 +51,11 @@ sealed interface SessionSource {
      */
     data object Storage : SessionSource
 
+    /**
+     * The session was loaded from an anonymous sign in
+     */
+    data object AnonymousSignIn : SessionSource
+
     /**
      * The session was loaded from a sign in
      * @param provider The provider that was used to sign in