Enabling the web resources checksum feature

Use the web resources checksum feature to verify the integrity of your cross-platform app.

Before you begin

You must have the Cordova development tools installed. This example uses the Apache Cordova CLI. If you use other Cordova development tools, some of your steps will be different. Refer to your Cordova tool documentation for instructions.
You must have the MobileFirst Platform CLI installed. For more information, see Installing the MobileFirst Platform CLI.
You must have the IBM MobileFirst Platform Foundation plugin.
You must add the platform to your Cordova project before you can enable the web resources checksum feature for that operating system by entering the cordova platform add [android|ios|windows] command.

About this task

When it is enabled, the web resources checksum feature compares the original web resources of an app when it is started to a stored baseline that was captured the first time that app was started. This is a good way of identifying any differences in the app that might indicate that the app was modified. This procedure is compatible with the Direct Update feature.

To enable the web resources checksum feature for a Cordova app, complete the following steps:

Procedure

In a terminal window, navigate to the root directory of your target app.
Enter the following command to enable the web resources checksum feature for an operating system environment of your Cordova app:
```
mfpdev app config [android|ios|windows10|windows8|
windowsphone8]_security_test_web_resources_checksum true
```
For example:
```
mfpdev app config android_security_test_web_resources_checksum true
```
You can disable the feature by replacing true in the command with false.
Tip: You can view information about the mfpdev app config command by entering mfpdev help app config.
Enter the following command to identify the types of files that you want to ignore during the checksum test:
```
mfpdev app config [android|ios|windows10|windows8|
windowsphone8]_security_ignore_file_extensions [ file_extension1,file_extension2 ]
```
Multiple extensions must be separated by a comma with no spaces between them. For example:
```
mfpdev app config android_security_ignore_file_extensions jpg,png,pdf
```
Important: Running this command overwrites the values that are set.
The more files that the web resources checksum scans for its test, the longer it takes for the app to open. You can specify the extension of a file type to skip, which might improve the speed of starting the app.

Results

Your app has the web resources checksum feature enabled.

What to do next

Run the following command to integrate the changes into your app:
```
cordova prepare
```
Build your app by entering the following command:
```
cordova build
```
Run your app by entering the following command:
```
cordova run
```