1 files changed, 81 insertions, 0 deletions
diff --git a/toolkit/mozapps/extensions/content/drag-drop-addon-installer.js b/toolkit/mozapps/extensions/content/drag-drop-addon-installer.js
new file mode 100644
index 0000000000..0a4f3f749c
--- /dev/null
+++ b/toolkit/mozapps/extensions/content/drag-drop-addon-installer.js
@@ -0,0 +1,81 @@
+/* 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/. */
+/* import-globals-from aboutaddonsCommon.js */
+
+"use strict";
+
+class DragDropAddonInstaller extends HTMLElement {
+  connectedCallback() {
+    window.addEventListener("drop", this);
+  }
+
+  disconnectedCallback() {
+    window.removeEventListener("drop", this);
+  }
+
+  canInstallFromEvent(e) {
+    let types = e.dataTransfer.types;
+    return (
+      types.includes("text/uri-list") ||
+      types.includes("text/x-moz-url") ||
+      types.includes("application/x-moz-file")
+    );
+  }
+
+  handleEvent(e) {
+    if (!XPINSTALL_ENABLED) {
+      // Nothing to do if we can't install add-ons.
+      return;
+    }
+
+    if (e.type == "drop" && this.canInstallFromEvent(e)) {
+      this.onDrop(e);
+    }
+  }
+
+  async onDrop(e) {
+    e.preventDefault();
+
+    let dataTransfer = e.dataTransfer;
+    let browser = getBrowserElement();
+    let urls = [];
+
+    // Convert every dropped item into a url, without this should be sync.
+    for (let i = 0; i < dataTransfer.mozItemCount; i++) {
+      let url = dataTransfer.mozGetDataAt("text/uri-list", i);
+      if (!url) {
+        url = dataTransfer.mozGetDataAt("text/x-moz-url", i);
+      }
+      if (url) {
+        url = url.split("\n")[0];
+      } else {
+        let file = dataTransfer.mozGetDataAt("application/x-moz-file", i);
+        if (file) {
+          url = Services.io.newFileURI(file).spec;
+        }
+      }
+
+      if (url) {
+        urls.push(url);
+      }
+    }
+
+    // Install the add-ons, the await clears the event data so we do this last.
+    for (let url of urls) {
+      let install = await AddonManager.getInstallForURL(url, {
+        telemetryInfo: {
+          source: "about:addons",
+          method: "drag-and-drop",
+        },
+      });
+
+      AddonManager.installAddonFromAOM(
+        browser,
+        document.documentURIObject,
+        install
+      );
+    }
+  }
+}
+customElements.define("drag-drop-addon-installer", DragDropAddonInstaller);