Add a new module to manage Yubikey devices (#785)

* Add a new module to manage a Yubikey device

* Set python 3.6+ as a requeriment

* remove the enable_shell parameter used by run_through_shell in the yubikey module

.travis.yml

@@ -1,7 +1,7 @@
 language: python
 sudo: false
 python:
-  - "3.4"
+  - "3.6"
 install:
   - "pip install -r dev-requirements.txt"
 script: "./ci-build.sh"

README.rst

@@ -7,7 +7,7 @@ i3pystatus
 i3pystatus is a large collection of status modules compatible with i3bar from the i3 window manager.
 
 :License: MIT
-:Python: 3.4+
+:Python: 3.6+
 :Governance: Patches that don't break the build (Travis or docs) are generally just merged. This is a "do-it-yourself" project, so to speak.
 :Releases: No further releases are planned. Install it from Git.
 
@@ -15,7 +15,7 @@ Installation
 ------------
 
 **Supported Python versions**
-    i3pystatus requires Python 3.4 or newer and is not compatible with
+    i3pystatus requires Python 3.6 or newer and is not compatible with
     Python 2.x. Some modules require additional dependencies
     documented in the docs.
 

i3pystatus/yubikey.py

@@ -0,0 +1,133 @@
+import re
+import os
+import time
+
+from i3pystatus import IntervalModule
+from i3pystatus.core.command import run_through_shell
+
+
+class Yubikey(IntervalModule):
+    """
+    This module allows you to lock and unlock your Yubikey in order to avoid
+    the OTP to be triggered accidentally.
+
+    @author Daniel Theodoro <daniel.theodoro AT gmail.com>
+    """
+
+    interval = 1
+    format = "Yubikey: 🔒"
+    unlocked_format = "Yubikey: 🔓"
+    timeout = 5
+    color = "#00FF00"
+    unlock_color = "#FF0000"
+
+    settings = (
+        ("format", "Format string"),
+        ("unlocked_format", "Format string when the key is unlocked"),
+        ("timeout", "How long the Yubikey will be unlocked (default: 5)"),
+        ("color", "Standard color"),
+        ("unlock_color", "Set the color used when the Yubikey is unlocked"),
+    )
+
+    on_leftclick = ["set_lock", True]
+
+    find_regex = re.compile(
+        r".*yubikey.*id=(?P<yubid>\d+).*$",
+        re.IGNORECASE
+    )
+
+    status_regex = re.compile(
+        r".*device enabled.*(?P<status>\d)$",
+        re.IGNORECASE
+    )
+
+    lock_file = f"/var/tmp/Yubikey-{os.geteuid()}.lock"
+
+    def __init__(self):
+        super().__init__()
+
+    @property
+    def _device_id(self):
+        command = run_through_shell("xinput list")
+
+        rval = ""
+
+        if command.rc == 0:
+            for line in command.out.splitlines():
+                match = self.find_regex.match(line)
+                if match:
+                    rval = match.groupdict().get("yubid", "")
+                    break
+
+        return rval
+
+    def device_status(self):
+
+        rval = "notfound"
+
+        if not self._device_id:
+            return rval
+
+        result = run_through_shell(f"xinput list-props {self._device_id}")
+        if result.rc == 0:
+            match = self.status_regex.match(result.out.splitlines()[1])
+            if match and "status" in match.groupdict():
+                status = int(match.groupdict()["status"])
+                if status:
+                    rval = "unlocked"
+                else:
+                    rval = "locked"
+
+        return rval
+
+    def _check_lock(self):
+        try:
+            st = os.stat(self.lock_file)
+
+            if int(time.time() - st.st_ctime) > self.timeout:
+                self.set_lock()
+
+        except IOError:
+            self.set_lock()
+
+    def set_lock(self, unlock=False):
+
+        if unlock:
+            command = "enable"
+        else:
+            command = "disable"
+
+        run_through_shell(f"xinput {command} {self._device_id}")
+        open(self.lock_file, mode="w").close()
+
+    def _clear_lock(self):
+        try:
+            os.unlink(self.lock_file)
+        except FileNotFoundError:
+            pass
+
+    def run(self):
+        status = self.device_status()
+
+        if status == "notfound":
+            self._clear_lock()
+            self.output = {
+                "full_text": "",
+            }
+        else:
+            if status == "unlocked":
+                self.output = {
+                    "full_text": self.unlocked_format,
+                    "color": self.unlock_color
+                }
+                self._check_lock()
+
+            elif status == "locked":
+                self.output = {
+                    "full_text": self.format,
+                    "color": self.color
+                }
+            else:
+                self.output = {
+                    "full_text": f"Error: {status}",
+                }