1 files changed, 129 insertions, 0 deletions
diff --git a/devtools/client/responsive/utils/ua.js b/devtools/client/responsive/utils/ua.js
new file mode 100644
index 0000000000..70c99c552d
--- /dev/null
+++ b/devtools/client/responsive/utils/ua.js
@@ -0,0 +1,129 @@
+/* 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 BROWSERS = [
+  {
+    name: "Firefox",
+    mustContain: new RegExp(`(?:Firefox|FxiOS)\/(${getVersionRegex(1, 1)})`),
+  },
+  {
+    name: "Opera",
+    mustContain: new RegExp(`(?:OPR|Opera)\/(${getVersionRegex(1, 1)})`),
+  },
+  {
+    name: "Safari",
+    mustContain: new RegExp(`Version\/(${getVersionRegex(1, 1)}).+Safari`),
+    mustNotContain: new RegExp("Chrome|Chromium"),
+  },
+  {
+    name: "Edge",
+    mustContain: new RegExp(`Edge\/(${getVersionRegex(0, 1)})`),
+  },
+  {
+    name: "Chrome",
+    mustContain: new RegExp(`(?:Chrome|CriOS)\/(${getVersionRegex(1, 1)})`),
+  },
+  {
+    name: "IE",
+    mustContain: new RegExp(`MSIE (${getVersionRegex(1, 1)})`),
+  },
+];
+
+const OSES = [
+  {
+    name: "iOS",
+    minMinorVersionCount: 0,
+    mustContain: new RegExp(`CPU iPhone OS (${getVersionRegex(0, 2)})`),
+  },
+  {
+    name: "iPadOS",
+    minMinorVersionCount: 0,
+    mustContain: new RegExp(`CPU OS (${getVersionRegex(0, 2)})`),
+  },
+  {
+    name: "Windows Phone",
+    minMinorVersionCount: 1,
+    mustContain: new RegExp(`Windows Phone (${getVersionRegex(1, 2)})`),
+  },
+  {
+    name: "Chrome OS",
+    minMinorVersionCount: 1,
+    mustContain: new RegExp(`CrOS .+ (${getVersionRegex(1, 2)})`),
+  },
+  {
+    name: "Android",
+    minMinorVersionCount: 0,
+    mustContain: new RegExp(`Android (${getVersionRegex(0, 2)})`),
+  },
+  {
+    name: "Windows NT",
+    minMinorVersionCount: 1,
+    mustContain: new RegExp(`Windows NT (${getVersionRegex(1, 2)})`),
+  },
+  {
+    name: "Mac OSX",
+    minMinorVersionCount: 1,
+    mustContain: new RegExp(`Intel Mac OS X (${getVersionRegex(1, 2)})`),
+  },
+  {
+    name: "Linux",
+    mustContain: new RegExp("Linux"),
+  },
+];
+
+function getVersionRegex(minMinorVersionCount, maxMinorVersionCount) {
+  return `\\d+(?:[._][0-9a-z]+){${minMinorVersionCount},${maxMinorVersionCount}}`;
+}
+
+function detect(ua, dataset) {
+  for (const {
+    name,
+    mustContain,
+    mustNotContain,
+    minMinorVersionCount,
+  } of dataset) {
+    const result = mustContain.exec(ua);
+
+    if (!result) {
+      continue;
+    }
+
+    if (mustNotContain && mustNotContain.test(ua)) {
+      continue;
+    }
+
+    let version = null;
+
+    if (result && result.length === 2) {
+      // Remove most minor version if that expresses 0.
+      let parts = result[1].match(/([0-9a-z]+)/g);
+      parts = parts.reverse();
+      const validVersionIndex = parts.findIndex(
+        part => parseInt(part, 10) !== 0
+      );
+      if (validVersionIndex !== -1) {
+        parts = parts.splice(validVersionIndex);
+        for (let i = 0; i < minMinorVersionCount + 1 - parts.length; i++) {
+          parts.unshift(0);
+        }
+      }
+      version = parts.reverse().join(".");
+    }
+
+    return { name, version };
+  }
+
+  return null;
+}
+
+function parseUserAgent(ua) {
+  return {
+    browser: detect(ua, BROWSERS),
+    os: detect(ua, OSES),
+  };
+}
+
+module.exports = { parseUserAgent };