Using Variables¶

Variables help you capture values that are commonly used by different tasks, nodes, and other VA elements. You can configure a variable as a key-value pair once in the VA settings and substitute key with value at runtime during the conversation flow. By capturing frequently used values in a single place, variables provide the advantages of reusability and consistency. For example, let’s say you are testing a flight booking app using a staging endpoint. If you configure the endpoint as a variable, it helps you to call the API from several places quickly. When you want to change the staging endpoint to production while publishing the VA, it is easy. Similarly, variables can be used to externalize content for messages and prompts from the dialog flow definition. Kore.ai platform allows VA developers to define two types of variables – Environment and Content.

Environment Variables¶

Environment Variables are global, reusable components which can be used in multiple places to define the VA configuration. Every Environment Variable is a key-value pair. The Variable Keys can be used at various places in the VA configuration. The platform will resolve/replace the Variable Keys with Variables Values during the conversation. Some of the typical use cases where a developer can use environment variables are:

To manage the app across environments having different endpoint URLs. The app can be exported and imported based on the environment, and the infrastructure team will need to modify only the variable configuration file.
To manage Conditions in the Dialog Node Transitions. Only the left-hand side of the transition condition uses Environment Variables. The right-hand side of the transition conditions does not use Environment Variables
To define and manage the app response that is repeated within the app configuration as variables.
Authorization Token
Channel-related tokens and URLs

Post the release of v8.1 of the platform, for on-prem installations, multiple value sets can be stored for these environment variables using Collections, refer here for more.

Note

Ensure that the Environment or Content variable name does not contain any hyphen.

Restricting Sensitive Data with Environment Variables¶

During the virtual assistant definition, developers may create environment variables for sensitive data like credentials/keys. These variables are useful for connecting to other systems using service nodes or as a part of authorization profiles. However, environment variables are visible to all the developers with shared access to the virtual assistant, especially when its definition is exported.

The latest Kore.ai XO Platform release introduces the Secure Variable feature for environment variables, which encrypts the added variable when enabled. This makes only the encrypted variable value visible to others and not the original value.

Important Considerations

The secure variable is encrypted in the database and does not require any encryption key.
The original value is used only internally for all service calls, language translation, etc. while executing the virtual assistant definition.
During the export of a secure variable through Bot or environment variables import, it has an empty value, so the original value is not available in plain text.

Leveraging Encrypted Environment Variable Values for Additional Modules

You can use the encrypted environment variable values in the following modules in addition to the other supported modules:

Channel Configuration: While configuring channels under Channels & Flows > Channels, you can use encrypted/regular environment variable values for all the fields including access token, access key, app ID, URLs, etc.
Languages: Under App Settings > Language Management > Translation Configurations, while configuring the translation engine, you can use the regular/encrypted environment variable value (type {{env.environment variable name}}) to set up the encrypted variable name as the access key as follows:
- The Access Key field for Google Translator or Microsoft Translator.
- The Value field in the Configure Translation Engine panel for Custom Translation Engine Configurations.
- Authorization Profiles – You can use encrypted/regular environment variables on the following fields while defining a new authorization mechanism for all types of authorizations:
  - Authorization Check URL, Field Key for form field, and Field Key and Field Value Authorization Fields for Authorization Type Basic Auth. Learn more.
  - Client Id, Client Secret Key, and Authorization URL for Authorization Type Oauth V2. Learn more.
  - Client Id, Client Secret Key, Token Request URL, Scope, and Refresh Token URL for Authorization Type Oauth V2 Client Credentials.
  - Consumer Key, Consumer Secret, Request Token Link, Access Token Link, and User Authorization Link for Authorization Type Oauth V1. Learn more.
  - Authorization Check URL and Field Key (for Form Field) for Authorization Type API Key. Learn more.
  - Field Key for Form Field, Token URL, Field Key, and Field Value for Authorization Field, and Refresh Token URL for Authorization Type Oauth V2 Password Grant Type. Learn more.

The availability of the environment variables has been extended to the Field Key and Field Value parameters.

Content Variables¶

Bot building essentially requires extensive content management efforts. When it comes to multi-language VAs, it also involves tedious coordination efforts between the developers and globally-distributed content authors or copyright team. Content variables enable you to overcome that by abstracting VA flow development efforts from authoring or editing the content. Using Content Variables, programmers can avoid hard-coding the VA content, such as prompts, messages, or any data presented to the user, into VA components, and instead point to specific variables in centrally managed Content Variables files for each app language. You can export the language-specific content variable files to content editors, without exposing any app configurations. The writers can author the content in the exported file, which you can import back into the app.

Note

Ensure that the Environment or Content variable name does not contain any hyphen.

Defining Bot Variables and Securing Them¶

Enabling the secure variable setting after defining an Environment (Bot) Variable, encrypts and securely stores credentials set as environment variables. To add a Bot variable, follow the steps below:

Open the VA for which you want to add the variables.
Navigate to App Settings > Variables on the left menu, and select Environment Variables tab to add Environment variables, or Content Variables tab to add Content Variables.
In the Add Variable panel, provide the following details:
- Variable Name: Enter the environment variable name. For example, user credentials.
- Value: Enter the environment variable value that is encrypted.
- Notes (optional): Any tip/note describing the environment variable.
- Group (optional): The name of the group to which the environment variable is mapped.
- Assign a Namespace if enabled (refer here for more).
Enable the secure variable by switching to the Enabled state (Disabled is the default setting).
Click Save.

The variable and its encrypted value appear in the list.

Entering Language-Specific Values¶

To add language-specific values for content variables, you first need to switch the app language. You can switch the language by clicking the name of the currently-enabled language from the top-right corner of the app’s page and then selecting another language as follows:

After switching the language, go to App Settings > Variables > Content Variables page and click the edit icon next to the relevant variable. Replace the text in the Value field in the enabled language.

Using Environment Variables¶

You can invoke an environment variable in plain text mode (Standard editor) using the following syntax: {{env.variableName}}. If you are using it in JavaScript mode, it is env.variableName Here’s an example from an app that uses two environment variables called botType and parameters to determine different app environments such as development, testing, and production. The following script node in one of the app’s tasks captures the base URL of the app, depending on the current app environment.

The URL in the following service node changes based on the captured URL

Updating the Environment Variable¶

For on-premise deployments, the user can update the encryption key/secured variable value with a new one. To edit the value, follow these steps:

Click the Edit icon of the secure variable listing.
In the Edit Environment Variable panel, click the Edit icon next to the Value textbox.
Enter the new variable value to be encrypted and click Done.
Click Save.

The new encrypted secure variable value is updated in the list as shown below:

Using Content Variables¶

You can invoke a content variable in plain text mode (Standard editor) using the following syntax. {{content.variableName}}. If you are using it in JavaScript mode, it is content.variableName Here’s an entity node of a multi-language flight booking app that captures the source airport of the users. It uses a content variable instead of a hard-coded user prompt.

When the app reaches this node as a part of the user interaction, the user prompt changes depending on the language of the interaction (provided you entered the respective variable values for all the enabled languages).

Importing and Exporting¶

You can import and export variables between apps.

On any of the Bot Variables page accessible from App Settings > Variables > (Environment/Content) Variables,
Click the ellipses next to Add Variables
To Import: Select Import to import variables from a JSON or CSV file
1. Since the import will replace the existing variables, you are advised to take a backup of the same.
2. After taking a Backup, Proceed with the Import
3. Select a JSON or CSV file to import (see below for the file format)
To Export: Select either Export CSV or Export JSON as the preferred format for the export file:
1. Bot variables are exported in the form of a JSON or CSV file based upon your selection.
2. This file includes both environment and content variables.

The Bot Variable file contains the following information, the same needs to be present in your Import file. CSV files need a header row. You are advised to refer to the Export (or backup) file and use the same format for the Import file.

key (mandatory) – name of the variable
scope – the scope of the variable corresponds to the Setup Option at the time of variable declaration (if not provided will be set to prePopulated) and can be
- prePopulated,
- askOnInstall, or
- hidden
value – the value of the variables
variableType (if not set will default to env)-
- env for Environment and
- locale for Content Variable
audioTag -for the player details in case IVR enabled
group – group name
hint – description of the variable
propagateVAlue – true or false
Namespace – the namespace associated to the variable
Language-specific variable

Sample CSV file:

Sample JSON file:

[
  {"key":"hosturl",
   "value":"https://platform.kore.ai",
   "hint":"This is the URL of environment which can be used across the endpoints configured in the app",
   "audioTag":"",
   "variableType":"env",
   "scope":"prePopulated",
   "group":"URLS"}
]