impl: read plugin version from the extension.json

fioan89 · fioan89 · commit 90d199c8e187 · 2025-02-22T00:24:22.000+02:00
- Toolbox does not provide a plugin manager interface with metadata about current plugin.
  So we had to implement one for ourselves in order to have simple things like plugin version.
- the implementation relies on the extension.json which is deployed in the root of the
  jar (i.e. the plugin jar)
- the rest of the json fields are ignored for now
diff --git a/src/main/kotlin/com/coder/toolbox/plugin/PluginInfo.kt b/src/main/kotlin/com/coder/toolbox/plugin/PluginInfo.kt
@@ -0,0 +1,12 @@
+package com.coder.toolbox.plugin
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+
+/**
+ * Small subset representation of extension.json
+ */
+@JsonClass(generateAdapter = true)
+data class PluginInfo(
+    @Json(name = "id") val id: String,
+    @Json(name = "version") val version: String)
diff --git a/src/main/kotlin/com/coder/toolbox/plugin/PluginManager.kt b/src/main/kotlin/com/coder/toolbox/plugin/PluginManager.kt
@@ -0,0 +1,27 @@
+package com.coder.toolbox.plugin
+
+import com.squareup.moshi.Moshi
+import java.io.InputStream
+
+object PluginManager {
+
+    val pluginInfo: PluginInfo by lazy {
+        loadPluginMetadata()
+    }
+
+    private fun loadPluginMetadata(): PluginInfo {
+        val resourcePath = "/extension.json"
+        val inputStream: InputStream? = PluginManager.javaClass.getResourceAsStream(resourcePath)
+            ?: throw IllegalArgumentException("Resource not found: $resourcePath")
+
+        if (inputStream == null) {
+            throw IllegalStateException("Can't load plugin information")
+        }
+
+        inputStream.use { stream ->
+            val jsonContent = stream.bufferedReader().readText()
+            return Moshi.Builder().build().adapter(PluginInfo::class.java).fromJson(jsonContent)
+                ?: throw IllegalArgumentException("Failed to parse JSON")
+        }
+    }
+}
