Improve Plugin API (allow to move encryption into plugin)

3 files changed, 102 insertions, 0 deletions

diff --git a/libdino/src/plugin/interfaces.vala b/libdino/src/plugin/interfaces.vala
new file mode 100644
index 00000000..19873003
--- /dev/null
+++ b/libdino/src/plugin/interfaces.vala
@@ -0,0 +1,16 @@
+namespace Dino.Plugins {
+
+public interface RootInterface : Object {
+    public abstract void registered(Dino.Application app);
+
+    public abstract void shutdown();
+}
+
+public interface EncryptionListEntry : Object {
+    public abstract Entities.Encryption encryption { get; }
+    public abstract string name { get; }
+
+    public abstract bool can_encrypt(Entities.Conversation conversation);
+}
+
+}
\ No newline at end of file
diff --git a/libdino/src/plugin/loader.vala b/libdino/src/plugin/loader.vala
new file mode 100644
index 00000000..43ce0801
--- /dev/null
+++ b/libdino/src/plugin/loader.vala
@@ -0,0 +1,66 @@
+namespace Dino.Plugins {
+
+public errordomain Error {
+	NOT_SUPPORTED,
+	UNEXPECTED_TYPE,
+	NO_REGISTRATION_FUNCTION,
+	FAILED
+}
+
+private class Info : Object {
+    public Module module;
+    public Type gtype;
+
+    public Info(Type type, owned Module module) {
+        this.module = (owned) module;
+        this.gtype = type;
+    }
+}
+
+public class Loader : Object {
+    [CCode (has_target = false)]
+    private delegate Type RegisterPluginFunction (Module module);
+
+    private RootInterface[] plugins = new RootInterface[0];
+    private Info[] infos = new Info[0];
+
+    public RootInterface load(string name, Dino.Application app) throws Error {
+        if (Module.supported () == false) {
+            throw new Error.NOT_SUPPORTED ("Plugins are not supported");
+        }
+
+        Module module = Module.open ("plugins/" + name, ModuleFlags.BIND_LAZY);
+        if (module == null) {
+            throw new Error.FAILED (Module.error ());
+        }
+
+        void* function;
+        module.symbol ("register_plugin", out function);
+        if (function == null) {
+            throw new Error.NO_REGISTRATION_FUNCTION ("register_plugin () not found");
+        }
+
+        RegisterPluginFunction register_plugin = (RegisterPluginFunction) function;
+        Type type = register_plugin (module);
+        if (type.is_a (typeof (RootInterface)) == false) {
+            throw new Error.UNEXPECTED_TYPE ("Unexpected type");
+        }
+
+        Info info = new Plugins.Info (type, (owned) module);
+        infos += info;
+
+        RootInterface plugin = (RootInterface) Object.new (type);
+        plugins += plugin;
+        plugin.registered (app);
+
+        return plugin;
+    }
+
+    public void shutdown() {
+        foreach (RootInterface p in plugins) {
+            p.shutdown();
+        }
+    }
+}
+
+}
\ No newline at end of file
diff --git a/libdino/src/plugin/registry.vala b/libdino/src/plugin/registry.vala
new file mode 100644
index 00000000..8c75784e
--- /dev/null
+++ b/libdino/src/plugin/registry.vala
@@ -0,0 +1,20 @@
+using Gee;
+
+namespace Dino.Plugins {
+
+public class Registry {
+    internal ArrayList<EncryptionListEntry> encryption_list_entries = new ArrayList<EncryptionListEntry>();
+
+    public bool register_encryption_list_entry(EncryptionListEntry entry) {
+        lock(encryption_list_entries) {
+            foreach(var e in encryption_list_entries) {
+                if (e.encryption == entry.encryption) return false;
+            }
+            encryption_list_entries.add(entry);
+            encryption_list_entries.sort((a,b) => b.name.collate(a.name));
+            return true;
+        }
+    }
+}
+
+}
\ No newline at end of file