Add Firefox extension build (#277)

1 files changed, 48 insertions, 0 deletions

diff --git a/browser/background.js b/browser/background.js
new file mode 100644
index 0000000..5c99dd8
--- /dev/null
+++ b/browser/background.js
@@ -0,0 +1,48 @@
+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2022 Linnea Gräf
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+function setContentTypeOnStylesheets(details) {
+    if (details.type === "stylesheet") {
+        details.responseHeaders = details.responseHeaders.filter(it => it.name.toLowerCase() !== 'content-type');
+        details.responseHeaders.push({ name: "Content-Type", value: "text/css" });
+    }
+    return { responseHeaders: details.responseHeaders };
+}
+
+var cspHeaders = [
+    "content-security-policy",
+    "content-security-policy-report-only",
+];
+
+function removeCSPHeaders(details) {
+    return {
+        responseHeaders: details.responseHeaders.filter(header =>
+            !cspHeaders.includes(header.name.toLowerCase()))
+    };
+}
+
+
+
+
+browser.webRequest.onHeadersReceived.addListener(
+    setContentTypeOnStylesheets, { urls: ["https://raw.githubusercontent.com/*"] }, ["blocking", "responseHeaders"]
+);
+
+browser.webRequest.onHeadersReceived.addListener(
+    removeCSPHeaders, { urls: ["https://raw.githubusercontent.com/*", "*://*.discord.com/*"] }, ["blocking", "responseHeaders"]
+);