1 files changed, 98 insertions, 0 deletions
diff --git a/devtools/client/aboutdebugging/src/modules/debug-target-support.js b/devtools/client/aboutdebugging/src/modules/debug-target-support.js
new file mode 100644
index 0000000000..2b8d4afa5b
--- /dev/null
+++ b/devtools/client/aboutdebugging/src/modules/debug-target-support.js
@@ -0,0 +1,98 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const {
+  DEBUG_TARGET_PANE,
+  PREFERENCES,
+  RUNTIMES,
+} = require("resource://devtools/client/aboutdebugging/src/constants.js");
+
+// Process target debugging is disabled by default.
+function isProcessDebuggingSupported() {
+  return Services.prefs.getBoolPref(
+    PREFERENCES.PROCESS_DEBUGGING_ENABLED,
+    false
+  );
+}
+
+// Local tab debugging is disabled by default.
+function isLocalTabDebuggingSupported() {
+  return Services.prefs.getBoolPref(
+    PREFERENCES.LOCAL_TAB_DEBUGGING_ENABLED,
+    false
+  );
+}
+
+// Local process debugging is disabled by default.
+// This preference has no default value in
+// devtools/client/preferences/devtools-client.js
+// because it is only intended for tests.
+function isLocalProcessDebuggingSupported() {
+  return Services.prefs.getBoolPref(
+    "devtools.aboutdebugging.test-local-process-debugging",
+    false
+  );
+}
+
+// Installing extensions can be disabled in enterprise policy.
+// Note: Temporary Extensions are only supported when debugging This Firefox, so checking
+// the local preference is acceptable here. If we enable Temporary extensions for remote
+// runtimes, we should retrieve the preference from the target runtime instead.
+function isTemporaryExtensionSupported() {
+  return Services.prefs.getBoolPref(PREFERENCES.XPINSTALL_ENABLED, true);
+}
+
+const ALL_DEBUG_TARGET_PANES = [
+  DEBUG_TARGET_PANE.INSTALLED_EXTENSION,
+  ...(isProcessDebuggingSupported() ? [DEBUG_TARGET_PANE.PROCESSES] : []),
+  DEBUG_TARGET_PANE.OTHER_WORKER,
+  DEBUG_TARGET_PANE.SERVICE_WORKER,
+  DEBUG_TARGET_PANE.SHARED_WORKER,
+  DEBUG_TARGET_PANE.TAB,
+  ...(isTemporaryExtensionSupported()
+    ? [DEBUG_TARGET_PANE.TEMPORARY_EXTENSION]
+    : []),
+];
+
+// All debug target panes (to filter out if any of the panels should be excluded).
+const REMOTE_DEBUG_TARGET_PANES = [...ALL_DEBUG_TARGET_PANES];
+
+const THIS_FIREFOX_DEBUG_TARGET_PANES = ALL_DEBUG_TARGET_PANES
+  // Main process debugging is not available for This Firefox.
+  // At the moment only the main process is listed under processes, so remove the category
+  // for this runtime.
+  .filter(
+    p => p !== DEBUG_TARGET_PANE.PROCESSES || isLocalProcessDebuggingSupported()
+  )
+  // Showing tab targets for This Firefox is behind a preference.
+  .filter(p => p !== DEBUG_TARGET_PANE.TAB || isLocalTabDebuggingSupported());
+
+const SUPPORTED_TARGET_PANE_BY_RUNTIME = {
+  [RUNTIMES.THIS_FIREFOX]: THIS_FIREFOX_DEBUG_TARGET_PANES,
+  [RUNTIMES.USB]: REMOTE_DEBUG_TARGET_PANES,
+  [RUNTIMES.NETWORK]: REMOTE_DEBUG_TARGET_PANES,
+};
+
+/**
+ * A debug target pane is more specialized than a debug target. For instance EXTENSION is
+ * a DEBUG_TARGET but INSTALLED_EXTENSION and TEMPORARY_EXTENSION are DEBUG_TARGET_PANES.
+ */
+function isSupportedDebugTargetPane(runtimeType, debugTargetPaneKey) {
+  return SUPPORTED_TARGET_PANE_BY_RUNTIME[runtimeType].includes(
+    debugTargetPaneKey
+  );
+}
+exports.isSupportedDebugTargetPane = isSupportedDebugTargetPane;
+
+/**
+ * Check if the given runtimeType supports temporary extension installation
+ * from about:debugging (currently disallowed on non-local runtimes).
+ */
+function supportsTemporaryExtensionInstaller(runtimeType) {
+  return runtimeType === RUNTIMES.THIS_FIREFOX;
+}
+exports.supportsTemporaryExtensionInstaller =
+  supportsTemporaryExtensionInstaller;