Added disconnect from network

Author: maciej-rosiek

lib/darwin.js

@@ -135,3 +135,21 @@ module.exports =
       stdout = @execSync COMMANDS[com]
       _msg = "Success!"
       @WiFiLog _msg
+
+  disconnectFromAP: ( _ap ) ->
+    COMMANDS =
+      disconnect: "networksetup -removepreferredwirelessnetwork #{@WiFiControlSettings.iface} \"#{_ap.ssid}\""
+    disconnectFromAPChain = [ "connect" ]
+    for com in disconnectFromAPChain
+      @WiFiLog "Executing:\t#{COMMANDS[com]}"
+      try
+        stdout = @execSync COMMANDS[com]
+      catch error
+      if stdout is "Could not find network #{_ap.ssid}."
+        _msg = "Error: No network called #{_ap.ssid} could be found."
+        @WiFiLog _msg, true
+        return {
+          success: false
+          msg: _msg
+        }
+      @WiFiLog "Success!"

lib/linux.js

@@ -221,3 +221,65 @@ module.exports =
       stdout = @execSync COMMANDS[com]
       _msg = "Success!"
       @WiFiLog _msg
+
+  #
+  # With Linux, we can use nmcli to do the heavy lifting.
+  #
+  disconnectFromAP: ( _ap ) ->
+    #
+    # (1) Does a connection that matches the name of the ssid
+    #     already exist?
+    #
+    COMMANDS =
+      delete: "nmcli connection delete \"#{_ap.ssid}\""
+    try
+      stdout = @execSync "nmcli connection show \"#{_ap.ssid}\""
+      ssidExist = true if stdout.length
+    catch error
+      ssidExist = false
+
+    #
+    # (2) Delete the old connection, if there is one.
+    #     Then, create a new connection.
+    #
+    disconnectFromAPChain = []
+    if ssidExist
+      @WiFiLog "It appears there is already a connection for this SSID."
+      disconnectFromAPChain.push "delete"
+
+    #
+    # (3) Connect to AP using using the above constructed
+    #     command chain.
+    #
+    for com in disconnectFromAPChain
+      @WiFiLog "Executing:\t#{COMMANDS[com]}"
+      #
+      # Run the command, handle any errors that get thrown.
+      #
+      try
+        stdout = @execSync COMMANDS[com]
+      catch error
+        if error.stderr.toString().trim() is "Error: No network with SSID '#{_ap.ssid}' found."
+          _msg = "Error: No network called #{_ap.ssid} could be found."
+          @WiFiLog _msg, true
+          return {
+            success: false
+            msg: _msg
+          }
+        else if error.stderr.toString().search /Error:/ != -1
+          _msg = error.stderr.toString().trim()
+          @WiFiLog _msg, true
+          return {
+            success: false
+            msg: _msg
+          }
+        # Ignore nmcli's add/modify errors, this is a system bug
+        @WiFiLog error, true
+        return {
+          success: false
+          msg: error
+        }
+      #
+      # Otherwise, so far so good!
+      #
+      @WiFiLog "Success!"

lib/wifi-control.js

@@ -286,6 +286,98 @@ module.exports =
         success: false
         msg: _msg
 
+  #
+  # disconnectFromAP: Direct the host machine to disconnect from a specific WiFi AP
+  #
+  disconnectFromAP: ( _ap, cb ) ->
+    unless CXT.WiFiControlSettings.iface?
+      _msg = "You cannot disconnect from a WiFi network without a valid wireless interface."
+      CXT.WiFiLog _msg, true
+      return {
+        success: false
+        msg: _msg
+      }
+    try
+      #
+      # (1) Verify there is a valid SSID
+      #
+      unless _ap.ssid.length
+        return {
+          success: false
+          msg: "Please provide a non-empty SSID."
+        }
+
+      #
+      # (3) Do the OS-specific dirty work
+      #
+      os_instructions.disconnectFromAP.call CXT, _ap
+
+      #
+      # (4) Now we keep checking the state of the network interface
+      #     to make sure it ends up actually being connected to the
+      #     desired SSID.
+      #
+      request_msg = "WiFi disconnection request to \"#{_ap.ssid}\" has been processed."
+      CXT.WiFiLog request_msg
+
+      #
+      # (5) check_iface is a helper function we use to repeatedly
+      #     check on the ifaceState using setTimeouts.  This containment
+      #     is important because it makes it possible to implement
+      #     connectionTimeout.
+      #
+      t0 = new Date()
+      check_iface = (_ap, cb) =>
+        ifaceState = @getIfaceState()
+        # If the connection is settled, check if we're connected
+        # to the requested _ap.
+        if ifaceState.success and (ifaceState.connection is "disconnected")
+          if !ifaceState.ssid?
+            #
+            # We're disconnected! Success.
+            #
+            _msg = "Successfully disconnected from \"#{_ap.ssid}\""
+            CXT.WiFiLog _msg
+            cb null,
+              success: true
+              msg: _msg
+          else
+            #
+            # We're connected, but to the wrong SSID!
+            #
+            _msg = "Error: Interface is currently connected to \"#{ifaceState.ssid}\""
+            CXT.WiFiLog _msg, true
+            connect_to_ap_result =
+              success: false
+              msg: _msg
+            cb _msg,
+              success: false
+              msg: "Error: Could not connect to #{_ap.ssid}"
+          return
+
+        # Attempt to confirm connection up to connectionTimeout milliseconds
+        if (new Date() - t0) < CXT.WiFiControlSettings.connectionTimeout
+          setTimeout ->
+            check_iface _ap, cb
+          , 250
+        else
+          cb "Disconnection confirmation timed out. (#{CXT.WiFiControlSettings.connectionTimeout}ms)",
+            success: false,
+            msg: "Error: Could not disconnect from #{_ap.ssid}"
+
+      #
+      # (6) Start the check_iface loop
+      #     This will eventually return the user's callback "cb".
+      #
+      check_iface _ap, cb
+
+    catch error
+      _msg = "Encountered an error while disconnecting from \"#{_ap.ssid}\": #{error}"
+      CXT.WiFiLog _msg, true
+      cb error,
+        success: false
+        msg: _msg
+
   #
   # resetWiFi:    Attempt to return the host machine's wireless to whatever
   #               network it connects to by default.

lib/win32.js

@@ -242,3 +242,6 @@ module.exports =
       stdout = @execSync COMMANDS[com]
       _msg = "Success!"
       @WiFiLog _msg
+
+  connectToAP: ( _ap ) ->
+    throw new Error("Not yet implemented")