feat(pluginhost): add OAuthProvider field to plugin metadata and update related functionality

internal/api/handlers/management/plugins.go

@@ -32,6 +32,7 @@ type pluginListEntry struct {
 	Enabled          bool                    `json:"enabled"`
 	EffectiveEnabled bool                    `json:"effective_enabled"`
 	SupportsOAuth    bool                    `json:"supports_oauth"`
+	OAuthProvider    string                  `json:"oauth_provider"`
 	Logo             string                  `json:"logo"`
 	ConfigFields     []pluginConfigFieldInfo `json:"config_fields"`
 	Menus            []pluginMenuInfo        `json:"menus"`
@@ -114,6 +115,7 @@ func (h *Handler) ListPlugins(c *gin.Context) {
 			entry.ID = htmlsanitize.String(info.ID)
 			entry.Registered = true
 			entry.SupportsOAuth = info.SupportsOAuth
+			entry.OAuthProvider = htmlsanitize.String(info.OAuthProvider)
 			entry.Logo = htmlsanitize.String(info.Metadata.Logo)
 			entry.ConfigFields = pluginConfigFields(info.Metadata.ConfigFields)
 			entry.Menus = pluginMenus(info.Menus)

internal/api/handlers/management/plugins_test.go

@@ -122,6 +122,7 @@ func TestListPluginsIncludesScannedAndConfiguredPlugins(t *testing.T) {
 			Enabled          bool   `json:"enabled"`
 			EffectiveEnabled bool   `json:"effective_enabled"`
 			SupportsOAuth    bool   `json:"supports_oauth"`
+			OAuthProvider    string `json:"oauth_provider"`
 			Logo             string `json:"logo"`
 			ConfigFields     []any  `json:"config_fields"`
 			Menus            []any  `json:"menus"`
@@ -154,7 +155,12 @@ func TestListPluginsIncludesScannedAndConfiguredPlugins(t *testing.T) {
 			EffectiveEnabled: item.EffectiveEnabled,
 			Path:             item.Path,
 		}
-		if item.Registered || item.SupportsOAuth || item.Logo != "" || len(item.ConfigFields) != 0 || len(item.Menus) != 0 {
+		if item.Registered ||
+			item.SupportsOAuth ||
+			item.OAuthProvider != "" ||
+			item.Logo != "" ||
+			len(item.ConfigFields) != 0 ||
+			len(item.Menus) != 0 {
 			t.Fatalf("unregistered plugin entry has runtime fields: %#v", item)
 		}
 	}

internal/pluginhost/host_test.go

@@ -585,6 +585,9 @@ func TestRegisteredPluginsIncludesMetadataAndOAuthCapability(t *testing.T) {
 	if !infos[0].SupportsOAuth {
 		t.Fatalf("RegisteredPlugins()[0].SupportsOAuth = false, want true; infos=%#v", infos)
 	}
+	if infos[0].OAuthProvider != "alpha" {
+		t.Fatalf("RegisteredPlugins()[0].OAuthProvider = %q, want alpha; infos=%#v", infos[0].OAuthProvider, infos)
+	}
 	if infos[0].Metadata.Logo == "" || len(infos[0].Metadata.ConfigFields) != 1 {
 		t.Fatalf("RegisteredPlugins()[0].Metadata = %#v, want logo and config fields", infos[0].Metadata)
 	}

internal/pluginhost/snapshot.go

@@ -27,6 +27,7 @@ type RegisteredPluginInfo struct {
 	Priority      int
 	Metadata      pluginapi.Metadata
 	SupportsOAuth bool
+	OAuthProvider string
 	Menus         []RegisteredPluginMenu
 }
 
@@ -67,11 +68,19 @@ func (h *Host) RegisteredPlugins() []RegisteredPluginInfo {
 	menusByPlugin := h.registeredPluginMenus()
 	out := make([]RegisteredPluginInfo, 0, len(records))
 	for _, record := range records {
+		authProvider := record.plugin.Capabilities.AuthProvider
+		oauthProvider := ""
+		if authProvider != nil && !h.isPluginFused(record.id) {
+			if identifier, okIdentifier := h.callAuthProviderIdentifier(record.id, authProvider); okIdentifier {
+				oauthProvider = identifier
+			}
+		}
 		out = append(out, RegisteredPluginInfo{
 			ID:            record.id,
 			Priority:      record.priority,
 			Metadata:      clonePluginMetadata(record.meta),
-			SupportsOAuth: record.plugin.Capabilities.AuthProvider != nil,
+			SupportsOAuth: authProvider != nil,
+			OAuthProvider: oauthProvider,
 			Menus:         menusByPlugin[record.id],
 		})
 	}