1 files changed, 20 insertions, 0 deletions
diff --git a/shared/src/commonMain/kotlin/dev/serrahima/lluerna/source/PostSource.kt b/shared/src/commonMain/kotlin/dev/serrahima/lluerna/source/PostSource.kt
new file mode 100644
index 0000000..fbf11bc
--- /dev/null
+++ b/shared/src/commonMain/kotlin/dev/serrahima/lluerna/source/PostSource.kt
@@ -0,0 +1,20 @@
+package dev.serrahima.lluerna.source
+
+import dev.serrahima.lluerna.domain.Post
+
+/**
+ * the seam that keeps the ui protocol-agnostic.
+ *
+ * v1 implements exactly one source (`StandardSiteSource`). a future
+ * `BlueskySource` / `WafrnSource` implements this same interface; the ui never
+ * learns a second protocol.
+ *
+ * (shape is tentative — it will settle once the feed milestone lands.)
+ */
+interface PostSource {
+    /** a follow-based feed for the given followed publication ids (at-uris). */
+    suspend fun feed(followedPublications: List<String>): List<Post>
+
+    /** the full chain ending at [uri], root-first. */
+    suspend fun thread(uri: String): List<Post>
+}