1 files changed, 112 insertions, 0 deletions
diff --git a/dom/ipc/ManifestMessagesChild.sys.mjs b/dom/ipc/ManifestMessagesChild.sys.mjs
new file mode 100644
index 0000000000..5a42fd3206
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+++ b/dom/ipc/ManifestMessagesChild.sys.mjs
@@ -0,0 +1,112 @@
+/* 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/.*/
+/*
+ * Manifest obtainer frame script implementation of:
+ * http://www.w3.org/TR/appmanifest/#obtaining
+ *
+ * It searches a top-level browsing context for
+ * a <link rel=manifest> element. Then fetches
+ * and processes the linked manifest.
+ *
+ * BUG: https://bugzilla.mozilla.org/show_bug.cgi?id=1083410
+ */
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  ManifestFinder: "resource://gre/modules/ManifestFinder.sys.mjs",
+  ManifestIcons: "resource://gre/modules/ManifestIcons.sys.mjs",
+  ManifestObtainer: "resource://gre/modules/ManifestObtainer.sys.mjs",
+});
+
+export class ManifestMessagesChild extends JSWindowActorChild {
+  receiveMessage(message) {
+    switch (message.name) {
+      case "DOM:WebManifest:hasManifestLink":
+        return this.hasManifestLink();
+      case "DOM:ManifestObtainer:Obtain":
+        return this.obtainManifest(message.data);
+      case "DOM:WebManifest:fetchIcon":
+        return this.fetchIcon(message);
+    }
+    return undefined;
+  }
+
+  /**
+   * Check if the document includes a link to a web manifest.
+   */
+  hasManifestLink() {
+    const response = makeMsgResponse();
+    response.result = lazy.ManifestFinder.contentHasManifestLink(
+      this.contentWindow
+    );
+    response.success = true;
+    return response;
+  }
+
+  /**
+   * Asynchronously obtains a web manifest from this window by using the
+   * ManifestObtainer and returns the result.
+   * @param {Object} checkConformance True if spec conformance messages should be collected.
+   */
+  async obtainManifest(options) {
+    const { checkConformance } = options;
+    const response = makeMsgResponse();
+    try {
+      response.result = await lazy.ManifestObtainer.contentObtainManifest(
+        this.contentWindow,
+        { checkConformance }
+      );
+      response.success = true;
+    } catch (err) {
+      response.result = serializeError(err);
+    }
+    return response;
+  }
+
+  /**
+   * Given a manifest and an expected icon size, ask ManifestIcons
+   * to fetch the appropriate icon and send along result
+   */
+  async fetchIcon({ data: { manifest, iconSize } }) {
+    const response = makeMsgResponse();
+    try {
+      response.result = await lazy.ManifestIcons.contentFetchIcon(
+        this.contentWindow,
+        manifest,
+        iconSize
+      );
+      response.success = true;
+    } catch (err) {
+      response.result = serializeError(err);
+    }
+    return response;
+  }
+}
+
+/**
+ * Utility function to Serializes an JS Error, so it can be transferred over
+ * the message channel.
+ * FIX ME: https://bugzilla.mozilla.org/show_bug.cgi?id=1172586
+ * @param  {Error} aError The error to serialize.
+ * @return {Object} The serialized object.
+ */
+function serializeError(aError) {
+  const clone = {
+    fileName: aError.fileName,
+    lineNumber: aError.lineNumber,
+    columnNumber: aError.columnNumber,
+    stack: aError.stack,
+    message: aError.message,
+    name: aError.name,
+  };
+  return clone;
+}
+
+function makeMsgResponse() {
+  return {
+    success: false,
+    result: undefined,
+  };
+}