skyflow-iOS

---

Skyflow’s iOS SDK can be used to securely collect, tokenize, and display sensitive data in the mobile without exposing your front-end infrastructure to sensitive data.

Table of Contents

• Installation
  • Requirements
  • Configuration
• Initializing Skyflow-iOS
• Securely collecting data client-side
• Securely collecting data client-side using Composable Elements
• Securely revealing data client-side

Installation

Requirements

• iOS 13.0.0 and above

Configuration

---

SPM (Swift Package Manager)

• Go to File -> Swift Packages -> New Package Dependency (in Xcode IDE)
• Enter https://github.com/skyflowapi/skyflow-iOS.git and press ok.

Cocoapods

• To integrate skyflow-iOS into your Xcode project using CocoaPods, specify it in your Podfile:

  #Mentioning the below source will pick the podspec from Skyflow repo
  #Otherwise you can add cocoapod trunk as the source
  #source 'https://github.com/skyflowapi/skyflow-iOS-spec.git'
  
  pod 'Skyflow'
  

Initializing skyflow-iOS

---

Use the initialize() method to initialize a Skyflow client as shown below.

//DemoTokenProvider is an implementation of the Skyflow.TokenProvider protocol
let demoTokenProvider = DemoTokenProvider() 
 
let config = Skyflow.Configuration(
    vaultID: <VAULT_ID>,
    vaultURL: <VAULT_URL>,
    tokenProvider: demoTokenProvider,
    options: Skyflow.Options(
      logLevel: Skyflow.LogLevel,    // optional, if not specified default is ERROR 
      env: Skyflow.Env              // optional, if not specified default is PROD
    ) 
)
 
let skyflowClient = Skyflow.initialize(config)

For the tokenProvider parameter, pass in an implementation of the Skyflow.TokenProvider protocol that declares a getBearerToken method which retrieves a Skyflow bearer token from your backend. This function will be invoked when the SDK needs to insert or retrieve data from the vault.

For example, if the response of the consumer tokenAPI is in the below format

{
   "accessToken": string,
   "tokenType": string
}

then, your Skyflow.TokenProvider Implementation should be as below

public class DemoTokenProvider: Skyflow.TokenProvider {
    public func getBearerToken(_ apiCallback: Skyflow.Callback) {
        if let url = URL(string: <YOUR_TOKEN_ENDPOINT>) {
            let session = URLSession(configuration: .default)
            let task = session.dataTask(with: url) {data, _, error in
                if error != nil {
                    print(error!)
                    return
                }
                if let safeData = data {
                    do {
                        let x = try JSONSerialization.jsonObject(with: safeData, options: []) as? [String: String]
                        if let accessToken = x?["accessToken"] {
                            apiCallback.onSuccess(accessToken)
                        }
                    } catch {
                        apiCallback.onFailure(error)
                    }
                }
            }
            task.resume()
        }
    }
}

NOTE: You should pass access token as String value in the success callback of getBearerToken.

For logLevel parameter, there are 4 accepted values in Skyflow.LogLevel

• DEBUG

  When Skyflow.LogLevel.DEBUG is passed, all level of logs will be printed(DEBUG, INFO, WARN, ERROR).

• INFO

  When Skyflow.LogLevel.INFO is passed, INFO logs for every event that has occurred during the SDK flow execution will be printed along with WARN and ERROR logs.

• WARN

  When Skyflow.LogLevel.WARN is passed, WARN and ERROR logs will be printed.

• ERROR

  When Skyflow.LogLevel.ERROR is passed, only ERROR logs will be printed.

Note:

• The ranking of logging levels is as follows : DEBUG < INFO < WARN < ERROR
• since logLevel is optional, by default the logLevel will be ERROR.

For env parameter, there are 2 accepted values in Skyflow.Env

• PROD

• DEV

  In Event Listeners, actual value of element can only be accessed inside the handler when the env is set to DEV.

Note:

• since env is optional, by default the env will be PROD.
• Use env option with caution, make sure the env is set to PROD when using skyflow-iOS in production.

---

Securely collecting data client-side

• Inserting data into the vault
• Using Skyflow Elements to collect data
• Using validations on Collect Elements
• Event Listener on Collect Elements
• UI Error for Collect Elements
• Set and Clear value for Collect Elements (DEV ENV ONLY)

Insert data into the vault

To insert data into your vault, use the skyflowClient.insert() method.

insert(records: [String: Any], options: InsertOptions?= InsertOptions() , callback: Skyflow.Callback) 

The insert() method requires a records parameter. The records parameter takes an array of records to insert into the vault.

Insert call example

let insertCallback = InsertCallback()     //A Custom callback using Skyflow.Callback
skyflowClient.insert(
   records: [
       "records": [
           [
               "table": "cards",
               "fields": [
                   "cardNumber": "41111111111",
                   "cvv": "123",
               ]
           ]
       ]
   ],
   callback: insertCallback
)

Skyflow returns tokens for the record you just inserted.

{
    "records": [ {
        "table": "cards",
        "fields": {
            "cardNumber": "f37186-e7e2-466f-91e5-48e12c2bcbc1",
            "cvv": "1989cb56-63da-4482-a2df-1f74cd0dd1a5"
        }
    }]
}

The options parameter takes a Skyflow.InsertOptions object.

InsertOptions includes a tokens boolean that controls whether you receive tokens after inserting a record into the vault.

InsertOptions also supports the upsert feature, that lets you conditionally insert or update an existing record by specifying the unique column to use as the unique value.

For example, if you specify the ‘customer_id’ column to use for upsert, and the same customer_id already exists, the existing record will update. If the customer_id doesn't exist, the vault creates a new record.

Insert call example

let records = [
    "records" : [
        [
            "table": "customers",  //The table where you are inserting the record.
            "fields": [                         
                "name" : "Francis",
                "customer_id" : "12345"
            ]
        ]
    ]
]

let upsertOptions = [["table": "customers", "column": "customer_id"]] as [[String : Any]]
let insertOptions = Skyflow.InsertOptions(tokens: false, upsert: upsertOptions)
let insertCallback = InsertCallback()  //Custom callback - implementation of Skyflow.Callback

skyflowClient.insert(records: records, options: insertOptions, callback: insertCallback)

Using Skyflow Elements to collect data

Skyflow Elements provide developers with pre-built form elements to securely collect sensitive data client-side. This reduces your PCI compliance scope by not exposing your front-end application to sensitive data. Follow the steps below to securely collect data with Skyflow Elements in your application.

Step 1: Create a container

First create a container for the form elements using the skyflowClient.container(type: Skyflow.ContainerType) method as show below

let container = skyflowClient.container(type: Skyflow.ContainerType.COLLECT)

Step 2: Create a collect Element

To create a collect Element, we must first construct a Skyflow.CollectElementInput object defined as shown below:

let collectElementInput = Skyflow.CollectElementInput(
    table: String,                  // optional, the table this data belongs to
    column: String,                 // optional, the column into which this data should be inserted
    inputStyles: Skyflow.Styles,     // optional styles that should be applied to the form element
    labelStyles: Skyflow.Styles,     // optional styles that will be applied to the label of the collect element
    errorTextStyles: Skyflow.Styles, // optional styles that will be applied to the errorText of the collect element
    label: String,                   // optional label for the form element
    placeholder: String,             // optional placeholder for the form element
    altText: String,                 // (DEPRECATED) optional that acts as an initial value for the collect element
    validations: ValidationSet,      // optional set of validations for the input element
    type: Skyflow.ElementType,       // Skyflow.ElementType enum
)

The table and column fields indicate which table and column in the vault the Element corresponds to. Note:

• Use dot delimited strings to specify columns nested inside JSON fields (e.g. address.street.line1)
• table and column are optional only if the element is being used in invokeConnection()

The inputStyles parameter accepts a Skyflow.Styles object which consists of multiple Skyflow.Styles objects which should be applied to the form element in the following states:

• base: all other variants inherit from these styles
• complete: applied when the Element has valid input
• empty: applied when the Element has no input
• focus: applied when the Element has focus
• invalid: applied when the Element has invalid input

Each Style object accepts the following properties, please note that each property is optional:

let style = Skyflow.Style(
    borderColor: UIColor,            // optional
    cornerRadius: CGFloat,           // optional
    padding: UIEdgeInsets,           // optional
    borderWidth: CGFloat,            // optional
    font: UIFont,                   // optional
    textAlignment: NSTextAlignment,  // optional
    textColor: UIColor               // optional
)

An example Skyflow.Styles object

let styles = Skyflow.Styles(
    base: style,                    // optional
    complete: style,                // optional
    empty: style,                   // optional
    focus: style,                   // optional
    invalid: style                  // optional
)

The labelStyles and errorTextStyles fields accept the above mentioned Skyflow.Styles object which are applied to the label and errorText text views respectively.

The states that are available for labelStyles are base and focus.

The state that is available for errorTextStyles is only the base state, it shows up when there is some error in the collect element.

The parameters in Skyflow.Style object that are respected for label and errorText text views are

• padding
• font
• textColor
• textAlignment

Other parameters in the Skyflow.Style object are ignored for label and errorText text views.

Finally, the type parameter takes a Skyflow.ElementType. Each type applies the appropriate regex and validations to the form element. There are currently 5 types:

• INPUT_FIELD
• CARDHOLDER_NAME
• CARD_NUMBER
• EXPIRATION_DATE
• CVV
• PIN
• EXPIRATION_YEAR
• EXPIRATION_MONTH

The INPUT_FIELD type is a custom UI element without any built-in validations. See the section on validations for more information on validations.

Along with CollectElementInput, you can define other options in the CollectElementOptions object which is described below.

Skyflow.CollectElementOptions(
  required: Boolean,               // Indicates whether the field is marked as required. Defaults to 'false'
  enableCardIcon: Boolean,         // Indicates whether card icon should be enabled (only for CARD_NUMBER inputs)
  format: String,                  // Format for the element 
  translation: [Character: String] // Indicates the allowed data type value for format.
  enableCopy: Boolean,                // Indicates whether to enable the copy icon in collect elements to copy text to clipboard. Defaults to 'false'
)

• required: Indicates whether the field is marked as required or not. Default is false.
• enableCardIcon: Indicates whether the icon is visible for the CARD_NUMBER element. Default is true.
• format: A string value that indicates the format pattern applicable to the element type. Only applicable to EXPIRATION_DATE, CARD_NUMBER, EXPIRATION_YEAR, and INPUT_FIELD elements. For INPUT_FIELD elements,
  • the length of format determines the expected length of the user input.
  • if translation isn't specified, the format value is considered a string literal.
• translation: A dictionary of key/value pairs, where the key is a character that appears in format and the value is a regex pattern of acceptable inputs for that character. Each key can only appear once. Only applicable for INPUT_FIELD elements.
• enableCopy: Indicates whether to enable the copy icon in collect elements to copy text to clipboard.

Accepted values by element type:

Element type	formatand translation values	Examples
EXPIRATION_DATE	format mm/yy(default) mm/yyyy yy/mm yyyy/mm	12/27 12/2027 27/12 2027/12
EXPIRATION_YEAR	format yyyy (default) yy	27 2027
CARD_NUMBER	format XXXX XXXX XXXX XXXX (default) XXXX-XXXX-XXXX-XXXX	1234 5678 9012 3456 1234-5678-9012-3456
INPUT_FIELD	format: A string that matches the desired output, with placeholder characters of your choice. translation: A dictionary of key/value pairs. Defaults to [ "X": "[0-9]"]	With a format of +91 XXXX-XX-XXXX and a translation of [ "X": "[0-9]"], user input of "1234121234" displays as "+91 1234-12-1234".

Collect Element Options examples for INPUT_FIELD Example 1

Skyflow.CollectElementOptions(
  required: true, 
  enableCardIcon: true,
  format:   "+91 XXXX-XX-XXXX",
  translation: [ "X": "[0-9]"] 
)

User input: "1234121234"

Value displayed in INPUT_FIELD: "+91 1234-12-1234"

Example 2

Skyflow.CollectElementOptions(
  required: true, 
  enableCardIcon: true,
  format:   "AY XX-XXX-XXXX",
  translation: [ "X": "[0-9]", "Y": "[A-Z]"] 
)

User input: "B1234121234"

Value displayed in INPUT_FIELD: "AB 12-341-2123"

Once the Skyflow.CollectElementInput and Skyflow.CollectElementOptions objects are defined, add to the container using the create(input: CollectElementInput, options: CollectElementOptions) method as shown below. The input param takes a Skyflow.CollectElementInput object as defined above and the options parameter takes an Skyflow.CollectElementOptions object as described below:

let collectElementInput = Skyflow.CollectElementInput(
    table: String,                  // the table this data belongs to
    column: String,                 // the column into which this data should be inserted
    inputStyles: Skyflow.Styles,     // optional styles that should be applied to the form element
    labelStyles: Skyflow.Styles,     // optional styles that will be applied to the label of the collect element
    errorTextStyles: Skyflow.Styles, // optional styles that will be applied to the errorText of the collect element
    label: String,                   // optional label for the form element
    placeholder: String,             // optional placeholder for the form element
    altText: String,                 // (DEPRECATED) optional that acts as an initial value for the collect element
    validations: ValidationSet,      // optional set of validations for the input element
    type: Skyflow.ElementType,       // Skyflow.ElementType enum
)

let collectElementOptions = Skyflow.CollectElementOptions(
    required: false,      // indicates whether the field is marked as required. Defaults to 'false',
    enableCardIcon: true, // indicates whether card icon should be enabled (only for CARD_NUMBER inputs)
    format: "mm/yy"       // format for the element,
    enableCopy: true,     // indicates whether to enable the copy icon in collect elements to copy text to clipboard. Defaults to 'false'
)

let element = container?.create(input: collectElementInput, options: collectElementOptions)

Step 3: Mount Elements to the Screen

To specify where the Elements will be rendered on the screen, create a parent UIView (like UIStackView, etc) and you can add it as a subview programmatically.

let stackView = UIStackView()
stackView.addArrangedSubview(element)

The Skyflow Element is an implementation of the UIView so it can be used/mounted similarly. Alternatively, you can use the unmount method to reset any collect element to it's initial state

func clearFieldsOnSubmit(_ elements: [TextField]) {
    // resets all elements in the array
    for element in elements {
        element.unmount()
    }
}

Step 4 : Collect data from Elements

When you submit the form, call the collect(options: Skyflow.CollectOptions? = nil, callback: Skyflow.Callback) method on the container object. The options parameter takes a Skyflow.CollectOptions object as shown below:

// Non-PCI records
let nonPCIRecords = ["table": "persons", "fields": [["gender": "MALE"]]]
// Upsert
let upsertOptions = [["table": "cards", "column": "cardNumber"]] as [[String : Any]]
// Send the non-PCI records as additionalFields of InsertOptions (optional) and apply upsert using `upsert` field of InsertOptions (optional)

let options = Skyflow.CollectOptions(tokens: true, additionalFields: nonPCIRecords)
 
//Custom callback - implementation of Skyflow.callback
let insertCallback = InsertCallback() 
container?.collect(callback: insertCallback, options: options)

Collect data with Skyflow Elements

Collect call example:

//Initialize skyflow configuration.
let config = Skyflow.Configuration(vaultID: VAULT_ID, vaultURL: VAULT_URL, tokenProvider: demoTokenProvider)
 
//Initialize skyflow client.
let skyflowClient = Skyflow.initialize(config)
 
//Create a CollectContainer.
let container = skyflowClient.container(type: Skyflow.ContainerType.COLLECT)
 
//Create Skyflow.Styles with individual Skyflow.Style variants.
let baseStyle = Skyflow.Style(borderColor: UIColor.blue)
let baseTextStyle = Skyflow.Style(textColor: UIColor.black)
let completeStyle = Skyflow.Style(borderColor: UIColor.green)
val focusTextStyle = Skyflow.Style(textColor: UIColor.red)
let inputStyles = Skyflow.Styles(base: baseStyle, complete: completeStyle)
let labelStyles = Skyflow.Styles(base: baseTextStyle, focus: focusTextStyle)
let errorTextStyles = Skyflow.Styles(base: baseTextStyle)
 
// Create a CollectElementInput.
let input = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardNumber",
    inputStyles: inputStyles,
    labelStyles: labelStyles,
    errorTextStyles: errorTextStyles,
    label: "card number",
    placeholder: "card number",
    type: Skyflow.ElementType.CARD_NUMBER
)
 
// Create an option to require the element.
let requiredOption = Skyflow.CollectElementOptions(required: true, enableCopy: true) 
 
// Create a Collect Element from the Collect Container.
let skyflowElement = container?.create(input: input, options: requiredOption)
 
// Can interact with this object as a normal UIView Object and add to View
 
// Non-PCI records
let nonPCIRecords = ["table": "persons", "fields": [["gender": "MALE"]]]
 
 //Upsert options
 let upsertOptions = [["table": "cards", "column": "cardNumber"]] as [[String : Any]]
 
// Send the Non-PCI records as additionalFields of CollectOptions (optional) and apply upsert using optional field `upsert` of CollectOptions.
let collectOptions = Skyflow.CollectOptions(tokens: true, additionalFields: nonPCIRecords, upsert: upsertOptions) 
 
 
//Implement a custom Skyflow.Callback to call on Insertion success/failure.
public class InsertCallback: Skyflow.Callback {
  public func onSuccess(_ responseBody: Any) {
      print(responseBody)
  }
   public func onFailure(_ error: Any) {
      print(error)
  }
}
 

// Initialize custom Skyflow.Callback.
let insertCallback = InsertCallback()
 
// Call collect method on CollectContainer.
container?.collect(callback: insertCallback, options: collectOptions)

Skyflow returns tokens for the record you just inserted:

{
    "records": [ {
        "table": "cards",
        "fields": {
            "cardNumber": "f3907186-e7e2-466f-91e5-48e12c2bcbc1"
        }
    }, {
        "table": "persons",
        "fields": {
            "gender": "12f670af-6c7d-4837-83fb-30365fbc0b1e",
        }
    }]
}

Validations

Skyflow-iOS provides two types of validations on Collect Elements

1. Default Validations:

Every Collect Element except of type INPUT_FIELD has a set of default validations listed below:

• CARD_NUMBER: Card number validation with checkSum algorithm(Luhn algorithm), available card lengths for defined card types
• CARD_HOLDER_NAME: Name should be 2 or more symbols, valid characters should match pattern - ^([a-zA-Z\\ \\,\\.\\-\\']{2,})$
• CVV: Card CVV can have 3-4 digits
• EXPIRATION_DATE: Any date starting from current month. By default valid expiration date should be in short year format - MM/YY
• PIN: Can have 4-12 digits

2. Custom Validations:

Custom validations can be added to any element which will be checked after the default validations have passed. The following Custom validation rules are currently supported:

• RegexMatchRule: You can use this rule to specify any Regular Expression to be matched with the text field value
• LengthMatchRule: You can use this rule to set the minimum and maximum permissible length of the textfield value
• ElementValueMatchRule: You can use this rule to match the value of one element with another

The Sample code below illustrates the usage of custom validations:

/*
 Reset Password - A simple example that illustrates custom validations.
 The below code shows two input fields with custom validations,
 one to enter a password and the second to confirm the same password.
 */

var myRuleset = ValidationSet()
let strongPasswordRule = RegexMatchRule(
    regex: "^(?=.*[A-Za-z])(?=.*\\d)[A-Za-z\\d]*$",
    error: "At least one letter and one number"
) // This rule enforces a strong password

let lengthRule = LengthMatchRule(
    minLength: 8,
    maxLength: 16,
    error: "Must be between 8 and 16 digits"
) // this rule allows input length between 8 and 16 characters

// for the Password element
myRuleset.add(rule: strongPasswordRule)
myRuleset.add(rule: lengthRule)

let collectElementOptions = CollectElementOptions(required: true)

let passwordInput = CollectElementInput(
    inputStyles: styles,
    label: "password",
    placeholder: "********",
    type: .INPUT_FIELD,
    validations: myRuleset
)
let password = container?.create(input: passwordInput, options: collectElementOptions)

// For confirm password element - shows error when the passwords don't match
let elementValueMatchRule = ElementValueMatchRule(element: password!, error: "passwords don't match")
let confirmPasswordInput = CollectElementInput(
    inputStyles: styles,
    label: "Confirm password",
    placeholder: "********",
    type: .INPUT_FIELD,
    validations: ValidationSet(rules: [strongPasswordRule, lengthRule, elementValueMatchRule])
)
let confirmPassword = container?.create(input: confirmPasswordInput, options: collectElementOptions)

// mount elements on screen - errors will be shown if any of the validaitons fail
stackView.addArrangedSubview(password!)
stackView.addArrangedSubview(confirmPassword!)

Event Listener on Collect Elements

Helps to communicate with skyflow elements by listening to an event

element!.on(eventName: Skyflow.EventName) { _ in
    // handle function
}

There are 4 events in Skyflow.EventName

• CHANGE
  Change event is triggered when the Element's value changes.
• READY
  Ready event is triggered when the Element is fully rendered
• FOCUS
  Focus event is triggered when the Element gains focus
• BLUR
  Blur event is triggered when the Element loses focus. The handler (state: [String: Any]) -> Void is a callback function you provide, that will be called when the event is fired with the state object as shown below.

let state = [
    "elementType": Skyflow.ElementType,
    "isEmpty": Bool ,
    "isFocused": Bool,
    "isValid": Bool,
    "value": String
]

Note: values of SkyflowElements will be returned in element state object only when env is DEV, else it is empty string i.e, '', but in case of CARD_NUMBER type element when the env is PROD for all the card types except AMEX, it will return first eight digits, for AMEX it will return first six digits and rest all digits in masked format.

Sample code snippet for using listeners

// create skyflow client with loglevel:"DEBUG"
let config = Skyflow.Configuration(
    vaultID: VAULT_ID,
    vaultURL: VAULT_URL,
    tokenProvider: demoTokenProvider,
    options: Skyflow.Options(logLevel: Skyflow.LogLevel.DEBUG)
)

let skyflowClient = Skyflow.initialize(config)

let container = skyflowClient.container(type: Skyflow.ContainerType.COLLECT)

// Create a CollectElementInput
let cardNumberInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardNumber",
    type: Skyflow.ElementType.CARD_NUMBER,
    )
let cardHolderNameInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardHolderName",
    type: Skyflow.ElementType.CARDHOLDER_NAME,
    )    

let cardNumber = container?.create(input: cardNumberInput)
let cardHolderName = container?.create(input: cardHolderNameInput)


// subscribing to CHANGE event, which gets triggered when element changes
cardNumber.on(eventName: Skyflow.EventName.CHANGE) { state in
    // Your implementation when Change event occurs
    print(state)
}

cardHolderName.on(eventName: Skyflow.EventName.CHANGE) { state in
    // Your implementation when Change event occurs
    print(state)
}

Sample Element state object when env is DEV

[
    "elementType": Skyflow.ElementType.CARD_NUMBER,
    "isEmpty": false,
    "isFocused": true,
    "isValid": true,
    "value": "4111111111111111"
]
[
    "elementType": Skyflow.ElementType.CARDHOLDER_NAME,
    "isEmpty": false,
    "isFocused": true,
    "isValid": true,
    "value": "John"
]

Sample Element state object when env is PROD

[
    "elementType": Skyflow.ElementType.CARD_NUMBER,
    "isEmpty": false,
    "isFocused": true,
    "isValid": true,
    "value": "41111111XXXXXXXX"
]
[
    "elementType": Skyflow.ElementType.CARDHOLDER_NAME,
    "isEmpty": false,
    "isFocused": true,
    "isValid": true,
    "value": ""
]

UI Error for Collect Elements

Helps to display custom error messages on the Skyflow Elements through the methods setError and resetError on the elements.

setError(error: String) method is used to set the error text for the element, when this method is trigerred, all the current errors present on the element will be overridden with the custom error message passed. This error will be displayed on the element until resetError() is trigerred on the same element.

resetError() method is used to clear the custom error message that is set using setError.

Sample code snippet for setError and resetError

// Create skyflow client with loglevel:"DEBUG"
let config = Skyflow.Configuration(
    vaultID: VAULT_ID,
    vaultURL: VAULT_URL,
    tokenProvider: demoTokenProvider,
    options: Skyflow.Options(logLevel: Skyflow.LogLevel.DEBUG)
)

let skyflowClient = Skyflow.initialize(config)

let container = skyflowClient.container(type: Skyflow.ContainerType.COLLECT)

// Create a CollectElementInput
let cardNumberInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardNumber",
    type: Skyflow.ElementType.CARD_NUMBER
)

let cardNumber = container.create(input: cardNumberInput)

// Set custom error
cardNumber.setError("custom error")

// Reset custom error
cardNumber.resetError()

Set and Clear value for Collect Elements (DEV ENV ONLY)

setValue(value: String) method is used to set the value of the element. This method will override any previous value present in the element.

clearValue() method is used to reset the value of the element.

Note: This methods are only available in DEV env for testing/developmental purposes and MUST NOT be used in PROD env.

Sample code snippet for setValue and clearValue

// Create skyflow client with env DEV
let config = Skyflow.Configuration(
    vaultID: VAULT_ID,
    vaultURL: VAULT_URL,
    tokenProvider: demoTokenProvider,
    options: Skyflow.Options(env: Skyflow.Env.DEV)
)

let skyflowClient = Skyflow.initialize(config)

let container = skyflowClient.container(type: Skyflow.ContainerType.COLLECT)

// Create a CollectElementInput
let cardNumberInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardNumber",
    type: Skyflow.ElementType.CARD_NUMBER
)

let cardNumber = container.create(input: cardNumberInput)

// Set a value programatically
cardNumber.setValue("4111111111111111")

// Clear the value
cardNumber.clearValue()

Securely collecting data client-side using Composable Elements

Composable Elements combine multiple Skyflow Elements in a single row. The following steps create a composable element and securely collect data through it.

Step 1: Create a composable container

First create a container for the form elements using the skyflowClient.container(type: Skyflow.ContainerType) method as show below

let container = skyflowClient.container(type: Skyflow.ContainerType.COMPOSABLE,  options: ContainerOptions)

The container requires an options object that contains the following keys:

• layout: An array that indicates the number of rows in the container and the number of elements in each row. The index value of the array defines the number of rows, and each value in the array represents the number of elements in that row, in order.

  For example: [2,1] means the container has two rows, with two elements in the first row and one element in the second row.

  Note: The sum of values in the layout array should be equal to the number of elements created

• styles: styles to apply to each composable row.

• errorTextStyles: styles to apply if an error is encountered.

var containerOptions = ContainerOptions(
                        layout: [1,1,2],               // required
                        styles: Skyflow.Styles,        // optional
                        errorTextStyles: Skyflow.Styles //optional
                        )

Step 2: Create Composable Elements

Composable Elements use the following schema:

let composableElementInput = Skyflow.CollectElementInput(
    table: String,                  // optional, the table this data belongs to
    column: String,                 // optional, the column into which this data should be inserted
    inputStyles: Skyflow.Styles,     // optional styles that should be applied to the form element
    labelStyles: Skyflow.Styles,     // optional styles that will be applied to the label of the collect element
    errorTextStyles: Skyflow.Styles, // optional styles that will be applied to the errorText of the collect element
    label: String,                   // optional label for the form element
    placeholder: String,             // optional placeholder for the form element
    altText: String,                 // (DEPRECATED) optional that acts as an initial value for the collect element
    validations: ValidationSet,      // optional set of validations for the input element
    type: Skyflow.ElementType,       // Skyflow.ElementType enum
)

The table and column fields indicate which table and column in the vault the Element correspond to. Note:

• Use dot delimited strings to specify columns nested inside JSON fields (e.g. address.street.line1)

The inputStyles parameter accepts a Skyflow.Styles object which consists of multiple Skyflow.Styles objects which should be applied to the form element in the following states:

• base: all other variants inherit from these styles
• complete: applied when the Element has valid input
• empty: applied when the Element has no input
• focus: applied when the Element has focus
• invalid: applied when the Element has invalid input

Each Style object accepts the following properties, please note that each property is optional:

let style = Skyflow.Style(
    borderColor: UIColor,            // optional
    cornerRadius: CGFloat,           // optional
    padding: UIEdgeInsets,           // optional
    borderWidth: CGFloat,            // optional
    font: UIFont,                   // optional
    textAlignment: NSTextAlignment,  // optional
    textColor: UIColor               // optional
)

An example Skyflow.Styles object

let styles = Skyflow.Styles(
    base: style,                    // optional
    complete: style,                // optional
    empty: style,                   // optional
    focus: style,                   // optional
    invalid: style                  // optional
)

The labelStyles and errorTextStyles fields accept the above mentioned Skyflow.Styles object which are applied to the label and errorText text views respectively.

The states that are available for labelStyles are base and focus.

The state that is available for errorTextStyles is only the base state, it shows up when there is some error in the composable element.

The parameters in Skyflow.Style object that are respected for label and errorText text views are

• padding
• font
• textColor
• textAlignment

Other parameters in the Skyflow.Style object are ignored for label and errorText text views.

Finally, the type parameter takes a Skyflow.ElementType. Each type applies the appropriate regex and validations to the form element.

The iOS SDK supports the following composable elements:

• INPUT_FIELD
• CARDHOLDER_NAME
• CARD_NUMBER
• EXPIRATION_DATE
• CVV
• PIN
• EXPIRATION_YEAR
• EXPIRATION_MONTH

Note: Only when the entered value in the below composable elements is valid, the focus shifts automatically. The element types are:

• CARD_NUMBER
• EXPIRATION_DATE
• EXPIRATION_MONTH
• EXPIRATION_YEAR

The INPUT_FIELD type is a custom UI element without any built-in validations. See the section on validations for more information on validations.

Along with CollectElementInput, you can define other options in the CollectElementOptions object which is described below.

Skyflow.CollectElementOptions(
  required: Boolean,               // Indicates whether the field is marked as required. Defaults to 'false'
  enableCardIcon: Boolean,         // Indicates whether card icon should be enabled (only for CARD_NUMBER inputs)
  format: String,                  // Format for the element 
  translation: [Character: String] // Indicates the allowed data type value for format.
)

• required: Indicates whether the field is marked as required or not. Default is false.
• enableCardIcon: Indicates whether the icon is visible for the CARD_NUMBER element. Default is true.
• format: A string value that indicates the format pattern applicable to the element type. Only applicable to EXPIRATION_DATE, CARD_NUMBER, EXPIRATION_YEAR, and INPUT_FIELD elements. For INPUT_FIELD elements,
  • the length of format determines the expected length of the user input.
  • if translation isn't specified, the format value is considered a string literal.
• translation: A dictionary of key/value pairs, where the key is a character that appears in format and the value is a regex pattern of acceptable inputs for that character. Each key can only appear once. Only applicable for INPUT_FIELD elements.

The accepted EXPIRATION_DATE values are

• mm/yy (default)
• mm/yyyy
• yy/mm
• yyyy/mm

The accepted EXPIRATION_YEAR values are

• yy (default)
• yyyy

Once the Skyflow.CollectElementInput and Skyflow.CollectElementOptions objects are defined, add to the container using the create(input: CollectElementInput, options: CollectElementOptions) method as shown below. The input param takes a Skyflow.CollectElementInput object as defined above and the options parameter takes an Skyflow.CollectElementOptions object as described below:

let composableElementInput = Skyflow.CollectElementInput(
    table: String,                  // the table this data belongs to
    column: String,                 // the column into which this data should be inserted
    inputStyles: Skyflow.Styles,     // optional styles that should be applied to the form element
    labelStyles: Skyflow.Styles,     // optional styles that will be applied to the label of the collect element
    errorTextStyles: Skyflow.Styles, // optional styles that will be applied to the errorText of the collect element
    label: String,                   // optional label for the form element
    placeholder: String,             // optional placeholder for the form element
    altText: String,                 // (DEPRECATED) optional that acts as an initial value for the collect element
    validations: ValidationSet,      // optional set of validations for the input element
    type: Skyflow.ElementType,       // Skyflow.ElementType enum
)

let collectElementOptions = Skyflow.CollectElementOptions(
    required: false,  // indicates whether the field is marked as required. Defaults to 'false',
    enableCardIcon: true, // indicates whether card icon should be enabled (only for CARD_NUMBER inputs)
    format: "mm/yy" // Format for the element
)

let element = container?.create(input: composableElementInput, options: collectElementOptions)

Step 3: Mount Elements to the Screen

To specify where the Elements will be rendered on the screen, create a parent UIView (like UIStackView, etc) and you can add composable elements view using container?.getComposableView(), it as a subview programmatically.

let stackView = UIStackView()
do {
    let composableView = try container?.getComposableView()
    stackView.addArrangedSubview(composableView)
} catch {
    print(error)
}

The Skyflow Element is an implementation of the UIView so it can be used/mounted similarly. Alternatively, you can use the unmount method to reset any collect element to it's initial state

func clearFieldsOnSubmit(_ elements: [TextField]) {
    // resets all elements in the array
    for element in elements {
        element.unmount()
    }
}

Step 4: Collect data from elements

When you submit the form, call the collect(options: Skyflow.CollectOptions? = nil, callback: Skyflow.Callback) method on the container object. The options parameter takes a Skyflow.CollectOptions object as shown below:

• tokens: Whether or not tokens for the collected data are returned. Defaults to 'true'
• additionalFields: Non-PCI elements data to insert into the vault, specified in the records object format.
• upsert: To support upsert operations, the table containing the data and a column marked as unique in that table.

// Non-PCI records
let nonPCIRecords = ["table": "persons", "fields": [["gender": "MALE"]]]
// Upsert
let upsertOptions = [["table": "cards", "column": "cardNumber"]] as [[String : Any]]
// Send the non-PCI records as additionalFields of InsertOptions (optional) and apply upsert using `upsert` field of InsertOptions (optional)

let options = Skyflow.CollectOptions(tokens: true, additionalFields: nonPCIRecords, upsert: upsertOptions)
 
//Custom callback - implementation of Skyflow.callback
let insertCallback = InsertCallback() 
container?.collect(callback: insertCallback, options: options)

End to end example of collecting data with Composable Elements

//Initialize skyflow configuration.
let config = Skyflow.Configuration(vaultID: VAULT_ID, vaultURL: VAULT_URL, tokenProvider: demoTokenProvider)
 
//Initialize skyflow client.
let skyflowClient = Skyflow.initialize(config)

let containerOptions = ContainerOptions(layout: [1,2], styles: Styles(base: Style(borderColor: UIColor.gray)), errorTextStyles: Styles(base: Style(textColor: UIColor.red)))
//Create a Composable Container.
let container = self.skyflow?.container(type: Skyflow.ContainerType.COMPOSABLE, options: containerOptions)
 
//Create Skyflow.Styles with individual Skyflow.Style variants.
let baseStyle = Skyflow.Style(borderColor: UIColor.blue)
let baseTextStyle = Skyflow.Style(textColor: UIColor.black)
let completeStyle = Skyflow.Style(borderColor: UIColor.green)
let focusTextStyle = Skyflow.Style(textColor: UIColor.red)
let inputStyles = Skyflow.Styles(base: baseStyle, complete: completeStyle)
let labelStyles = Skyflow.Styles(base: baseTextStyle, focus: focusTextStyle)
let errorTextStyles = Skyflow.Styles(base: baseTextStyle)
 
// Create Composable Elements.

let cardHolderNameElementInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "first_name",
    inputStyles: inputStyles,
    labelStyles: labelStyles,
    errorTextStyles: errorTextStyles,
    label: "first name",
    placeholder: "first name",
    type: Skyflow.ElementType.CARDHOLDER_NAME
)
// Create an option to require the element.
let requiredOption = Skyflow.CollectElementOptions(required: true) 

// Create a Composable Element from the Composable Container.
let cardHolderNameElement = container?.create(input: cardHolderNameElementInput, options: requiredOption)
 
 
let cardNumberElementInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardNumber",
    inputStyles: inputStyles,
    labelStyles: labelStyles,
    errorTextStyles: errorTextStyles,
    label: "card number",
    placeholder: "card number",
    type: Skyflow.ElementType.CARD_NUMBER
)
 
let cardNumberElement = container?.create(input: cardNumberElementInput, options: requiredOption)

let cvvElementInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cvv",
    inputStyles: inputStyles,
    labelStyles: labelStyles,
    errorTextStyles: errorTextStyles,
    label: "cvv",
    placeholder: "cvv",
    type: Skyflow.ElementType.CVV
)
 
let cvvElement = container?.create(input: cvvElementInput, options: requiredOption)

// Can interact with this object as a normal UIView Object and add to View
let stackView = UIStackView()
do {
    let composableView = try container?.getComposableView()
    stackView.addArrangedSubview(composableView)
} catch {
    print(error)
}
 
// Non-PCI records
let nonPCIRecords = ["table": "persons", "fields": [["gender": "MALE"]]]
 
 //Upsert options
let upsertOptions = [["table": "cards", "column": "cardNumber"]] as [[String : Any]]
 
// Send the Non-PCI records as additionalFields of CollectOptions (optional) and apply upsert using optional field `upsert` of CollectOptions.
let collectOptions = Skyflow.CollectOptions(tokens: true, additionalFields: nonPCIRecords, upsert: upsertOptions) 
 
 
//Implement a custom Skyflow.Callback to call on Insertion success/failure.
public class InsertCallback: Skyflow.Callback {
  public func onSuccess(_ responseBody: Any) {
      print(responseBody)
  }
   public func onFailure(_ error: Any) {
      print(error)
  }
}

// Initialize custom Skyflow.Callback.
let insertCallback = InsertCallback()
 
// Call collect method on CollectContainer.
container?.collect(callback: insertCallback, options: collectOptions)

Sample Response:

{
    "records": [ {
        "table": "cards",
        "fields": {
            "cardNumber": "f3907186-e7e2-466f-91e5-48e12c2bcbc1"
        }
    }, {
        "table": "persons",
        "fields": {
            "gender": "12f670af-6c7d-4837-83fb-30365fbc0b1e",
        }
    }]
}

For information on validations, see validations.

Set an event listener on Composable Elements:

You can communicate with Skyflow Elements by listening to element events:

element!.on(eventName: Skyflow.EventName) { _ in
    // handle function
}

The SDK supports four events:

• CHANGE: Triggered when the Element's value changes.
• READY: Triggered when the Element is fully rendered.
• FOCUS: Triggered when the Element gains focus.
• BLUR: Triggered when the Element loses focus.

The handler (state: [String: Any]) -> Void is a callback function you provide, that will be called when the event is fired with the state object as shown below.

let state = [
    "elementType": Skyflow.ElementType,
    "isEmpty": Bool ,
    "isFocused": Bool,
    "isValid": Bool,
    "value": String
]

Note: values of SkyflowElements will be returned in element state object only when env is DEV, else it is empty string i.e, '', but in case of CARD_NUMBER type element when the env is PROD for all the card types except AMEX, it will return first eight digits, for AMEX it will return first six digits and rest all digits in masked format.

Example Usage of Event Listener on Composable Elements

// create skyflow client with loglevel:"DEBUG"
let config = Skyflow.Configuration(
    vaultID: VAULT_ID,
    vaultURL: VAULT_URL,
    tokenProvider: demoTokenProvider,
    options: Skyflow.Options(logLevel: Skyflow.LogLevel.DEBUG)
)

let skyflowClient = Skyflow.initialize(config)

let containerOptions = ContainerOptions(layout: [2], styles: Styles(base: Style(borderColor: UIColor.gray)), errorTextStyles: Styles(base: Style(textColor: UIColor.red)))
//Create a Composable Container.
let container = self.skyflow?.container(type: Skyflow.ContainerType.COMPOSABLE, options: containerOptions)

// Create a CollectElementInput
let cardNumberInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardNumber",
    type: Skyflow.ElementType.CARD_NUMBER,
    )
let cardHolderNameInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardHolderName",
    type: Skyflow.ElementType.CARDHOLDER_NAME,
    )    

let cardNumber = container?.create(input: cardNumberInput)
let cardHolderName = container?.create(input: cardHolderNameInput)

let stackView = UIStackView()
do {
    let composableView = try container?.getComposableView()
    stackView.addArrangedSubview(composableView)
} catch {
    print(error)
}
// subscribing to CHANGE event, which gets triggered when element changes
cardNumber.on(eventName: Skyflow.EventName.CHANGE) { state in
    // Your implementation when Change event occurs
    print(state)
}

cardHolderName.on(eventName: Skyflow.EventName.CHANGE) { state in
    // Your implementation when Change event occurs
    print(state)
}

Sample Element state object when env is DEV

[
    "elementType": Skyflow.ElementType.CARD_NUMBER,
    "isEmpty": false,
    "isFocused": true,
    "isValid": true,
    "value": "4111111111111111"
]
[
    "elementType": Skyflow.ElementType.CARDHOLDER_NAME,
    "isEmpty": false,
    "isFocused": true,
    "isValid": true,
    "value": "John"
]

Sample Element state object when env is PROD

[
    "elementType": Skyflow.ElementType.CARD_NUMBER,
    "isEmpty": false,
    "isFocused": true,
    "isValid": true,
    "value": "41111111XXXXXXXX"
]
[
    "elementType": Skyflow.ElementType.CARDHOLDER_NAME,
    "isEmpty": false,
    "isFocused": true,
    "isValid": true,
    "value": ""
]

Update composable elements

You can update composable element properties with the update interface.

The update interface takes the below object:

let updateElement =  Skyflow.CollectElementInput(
    table: String,                   // optional the table this data belongs to
    column: String,                  // optional the column into which this data should be inserted
    inputStyles: Skyflow.Styles,     // optional styles that should be applied to the form element
    labelStyles: Skyflow.Styles,     // optional styles that will be applied to the label of the collect element
    errorTextStyles: Skyflow.Styles, // optional styles that will be applied to the errorText of the collect element
    label: String,                   // optional label for the form element
    placeholder: String,             // optional placeholder for the form element
    altText: String,                 // (DEPRECATED) optional that acts as an initial value for the collect element
    validations: ValidationSet,      // optional set of validations for the input element
)

Only include the properties that you want to update for the specified composable element.

Properties your provided when you created the element remain the same until you explicitly update them.

Note: You can't update the type property of an element.

End to end example

// create skyflow client with loglevel:"DEBUG"
let config = Skyflow.Configuration(
    vaultID: VAULT_ID,
    vaultURL: VAULT_URL,
    tokenProvider: demoTokenProvider,
    options: Skyflow.Options(logLevel: Skyflow.LogLevel.DEBUG)
)

let skyflowClient = Skyflow.initialize(config)

let containerOptions = ContainerOptions(layout: [2], styles: Styles(base: Style(borderColor: UIColor.gray)), errorTextStyles: Styles(base: Style(textColor: UIColor.red)))
//Create a Composable Container.
let container = self.skyflow?.container(type: Skyflow.ContainerType.COMPOSABLE, options: containerOptions)

// Create a CollectElementInput
let cardNumberInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardNumber",
    type: Skyflow.ElementType.CARD_NUMBER,
    )
let cardHolderNameInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardHolderName",
    type: Skyflow.ElementType.CARDHOLDER_NAME,
    )    

let cardNumber = container?.create(input: cardNumberInput)
let cardHolderName = container?.create(input: cardHolderNameInput)

let stackView = UIStackView()
do {
    let composableView = try container?.getComposableView()
    stackView.addArrangedSubview(composableView)
} catch {
    print(error)
}
// Update table, column, inputStyles properties on cardNumber.
cardNumber.update(update: CollectElementInput(
    table: "cards",
    column: "cardHolderName",
    inputStyles: Skyflow.Styles(base: Style(borderColor: UIColor.red))
))
let lengthRule = LengthMatchRule(
                    minLength: 5,
                    maxLength: 16,
                    error: "Must be between 5 and 16 digits")

// Update validations and placeholder property on cardHolderName.
cardHolderName.update(update: CollectElementInput(
    placeholder: "cardHolderName",
    validations: ValidationSet(rules: [lengthRule]))
))

Set an event listener on a composable container

Currently, the SDK supports one event:

• SUBMIT: Triggered when the Enter key is pressed in any container element.

The handler function(void) -> void is a callback function you provide that's called when the SUBMIT event fires.

Example

let containerOptions = ContainerOptions(layout: [1], styles: Styles(base: Style(borderColor: UIColor.gray)), errorTextStyles: Styles(base: Style(textColor: UIColor.red)))
//Create a Composable Container.
let composableContainer = self.skyflow?.container(type: Skyflow.ContainerType.COMPOSABLE, options: containerOptions)

// Creating the element.
let cardNumberInput = Skyflow.CollectElementInput(
    table: "cards",
    column: "cardNumber",
    type: Skyflow.ElementType.CARD_NUMBER,
    )
let cardNumber = composableContainer?.create(input: cardNumberInput)

// get composable view and mount it
let stackView = UIStackView()
do {
    let composableView = try composableContainer?.getComposableView()
    stackView.addArrangedSubview(composableView)
} catch {
    print(error)
}
// Subscribing to the `SUBMIT` event, which gets triggered when the user hits `enter` key in any container element input.
composableContainer?.on(eventName: .SUBMIT){
    // Your implementation when the SUBMIT(enter) event occurs.
    print('Submit Event Listener is being Triggered.')
}

Securely revealing data client-side

• Retrieving data from the vault
• Using Skyflow Elements to reveal data
• UI Error for Reveal Elements
• Set token for Reveal Elements
• Set and clear altText for Reveal Elements

Retrieving data from the vault

For non-PCI use-cases, retrieving data from the vault and revealing it in the mobile can be done either using the SkyflowID's or tokens as described below

• Using Skyflow tokens

  To retrieve record data using tokens, use the detokenize(records) method. The records parameter takes a Dictionary object that contains tokens for record values to fetch

  [
    "records": [
      [
        "token": String,
        "redaction": Skyflow.RedactionType // Optional. Redaction to apply for retrieved data.     
      ]
    ]
  ]
  

  Note: redaction defaults to RedactionType.PLAIN_TEXT.

The following example code makes a detokenize call to reveal the masked value of a token:

  let getCallback = GetCallback()   // Custom callback - implementation of Skyflow.Callback
 
  let records = [
                  "records": [
                    [
                      "token": "45012507-f72b-4f5c-9bf9-86b133bae719",
                    ],
                    [
                      "token": "1r434532-6f76-4319-bdd3-96281e051051",
                      "redaction": Skyflow.RedactionType.MASKED
                    ]
                  ]
                ] as [String: Any]
 
  skyflowClient.detokenize(records: records, callback: getCallback)

The sample response:

{
  "records": [
    {
      "token": "131e70dc-6f76-4319-bdd3-96281e051051",
      "value": "1990-01-01"
    },
    {
      "token": "1r434532-6f76-4319-bdd3-96281e051051",
      "value": "xxxxxxer",
    }
   ]
}

• Using Skyflow ID's

  For retrieving using SkyflowID's, use the getById(records) method. The records parameter takes a Dictionary object that contains records to be fetched as shown below.

  [
    "records": [
      [
        "ids": ArrayList<String>(),           // Array of SkyflowID's of the records to be fetched
        "table": String,                    // name of table holding the above skyflow_id's
        "redaction": Skyflow.RedactionType    //redaction to be applied to retrieved data
      ]
    ]
  ]
  

Redaction Types

There are 4 accepted values in Skyflow.RedactionTypes:

• PLAIN_TEXT
• MASKED
• REDACTED
• DEFAULT

An example of getById call:

let getCallback = GetCallback() // Custom callback - implementation of Skyflow.Callback

let skyflowIDs = ["f8d8a622-b557-4c6b-a12c-c5ebe0b0bfd9", "da26de53-95d5-4bdb-99db-8d8c66a35ff9"]
let record = ["ids": skyflowIDs, "table": "cards", "redaction": Skyflow.RedactionType.PLAIN_TEXT] as [String : Any]

let invalidID = ["invalid skyflow ID"]
let badRecord = ["ids": invalidID, "table": "cards", "redaction": Skyflow.RedactionType.PLAIN_TEXT] as [String : Any]

let records = ["records": [record, badRecord]]

skyflowClient.getById(records: records, callback: getCallback)

The sample response:

  {
    "records": [ {
        "fields": {
            "card_number": "4111111111111111",
            "cvv": "127",
            "expiry_date": "11/35",
            "fullname": "myname",
            "skyflow_id": "f8d8a622-b557-4c6b-a12c-c5ebe0b0bfd9"
        },
        "table": "cards"
    }, {
        "fields": {
            "card_number": "4111111111111111",
            "cvv": "317",
            "expiry_date": "10/23",
            "fullname": "sam",
            "skyflow_id": "da26de53-95d5-4bdb-99db-8d8c66a35ff9"
        },
        "table": "cards"
    }],
    "errors": [ {
        "error": {
            "code": "404",
            "description": "No Records Found"
        },
        "skyflow_ids": ["invalid skyflow id"]
    }]
  }

Using Skyflow Elements to reveal data

Skyflow Elements can be used to securely reveal data in an application without exposing your front end to the sensitive data. This is great for use-cases like card issuance where you may want to reveal the card number to a user without increasing your PCI compliance scope.

Step 1: Create a container

To start, create a container using the skyflowClient.container(Skyflow.ContainerType.REVEAL) method as shown below.

    let container = skyflowClient.container(type: Skyflow.ContainerType.REVEAL)

Step 2: Create a reveal Element

To create a reveal Element, we must first construct a Skyflow.RevealElementInput object defined as shown below:

let revealElementInput = Skyflow.RevealElementInput(
    token: String,                       // optional, token of the data being revealed
    inputStyles: Skyflow.Styles(),       // optional, styles to be applied to the element
    labelStyles: Skyflow.Styles(),       // optional, styles to be applied to the label of the reveal element
    errorTextStyles: Skyflow.Styles(),   // optional styles that will be applied to the errorText of the reveal element
    label: "cardNumber",                 // optional, label for the element,
    altText: "XXXX XXXX XXXX XXXX",      // optional, string that is shown before reveal, will show token if it is not provided
    redaction: Skyflow.RedactionType,    // optional. Redaction to apply for retrieved data. E.g. RedactionType.MASKED
)

Note:

• token is optional only if it is being used in invokeConnection()
• redaction defaults to RedactionType.PLAIN_TEXT.

The inputStyles parameter accepts a styles object as described in the previous section for collecting data but the only state available for a reveal element is the base state.

The labelStyles and errorTextStyles fields accept the above mentioned Skyflow.Styles object as described in the previous section, the only state available for a reveal element is the base state.

The inputStyles, labelStyles and errorTextStyles parameters accepts a styles object as described in the previous section for collecting data but only a single variant is available i.e. base.

An example of a inputStyles object:

let inputStyles = Skyflow.Styles(base: Skyflow.Style(borderColor: UIColor.green))

An example of a labelStyles object:

let labelStyles = Skyflow.Styles(base: Skyflow.Style(font: UIFont (name: "GILLSANSCE-ROMAN", size: 12))))

An example of a errorTextStyles object:

let labelStyles = Skyflow.Styles(base: Skyflow.Style(textColor: UIColor.red))

Along with RevealElementInput, you can define other options in the RevealElementOptions object as described below:

Skyflow.RevealElementOptions(
  format: String, // Format for the element.
  translation: [Character: String] // Indicates the allowed data type value for format
  enableCopy: Boolean, // Indicates whether to enable the copy icon in reveal elements to copy text to clipboard. Defaults to 'false'
)

• format: A string value that indicates how the element should display the value, including placeholder characters that map to keys translation If translation isn't specified, the format value is considered a string literal.
• translation: A dictionary of key/value pairs, where the key is a character that appears in format and the value is a regex pattern of acceptable inputs for that character. Each key can only appear once. Defaults to [ "X": "[0-9]"].
• enableCopy: Indicates whether to enable the copy icon in reveal elements to copy text to clipboard.

Reveal Element Options examples:

Example 1:

Skyflow.RevealElementOptions(
  format:   "(XXX) XXX-XXXX",
  translation: [ "X": "[0-9]"] 
)

Value from vault: "1234121234"

Value displayed in element: "(123) 412-1234"

Example 2:

Skyflow.RevealElementOptions(
  format:   "XXXX-XXXXXX-XXXXX",
  translation: [ "X": "[0-9]"] 
)

Value from vault: "374200000000004"

Value displayed in element: "3742-000000-00004"

Once you've defined a Skyflow.RevealElementInput object and Skyflow.RevealElementOptions, you can use the create() method of the container to create the Element as shown below:

let element = container.create(input: revealElementInput, options: Skyflow.RevealElementOptions(format: "XXXX-XXXXXX-XXXXX",
translation: ["X": "[0-9]"] 
))

Step 3: Mount Elements to the Screen

Elements used for revealing data are mounted to the screen the same way as Elements used for collecting data. Refer to Step 3 of the section above.

Step 4: Reveal data

When the sensitive data is ready to be retrieved and revealed, call the reveal() method on the container as shown below:

let revealCallback = RevealCallback()  // Custom callback - implementation of Skyflow.Callback
container.reveal(callback: revealCallback)

UI Error for Reveal Elements

Helps to display custom error messages on the Skyflow Elements through the methods setError and resetError on the elements.

setError(error: String) method is used to set the error text for the element, when this method is trigerred, all the current errors present on the element will be overridden with the custom error message passed. This error will be displayed on the element until resetError() is trigerred on the same element.

resetError() method is used to clear the custom error message that is set using setError.

Set token for Reveal Elements

The setToken(value: String) method can be used to set the token of the Reveal Element. If no altText is set, the set token will be displayed on the UI as well. If altText is set, then there will be no change in the UI but the token of the element will be internally updated.

Set and Clear altText for Reveal Elements

The setAltText(value: String) method can be used to set the altText of the Reveal Element. This will cause the altText to be displayed in the UI regardless of whether the token or value is currently being displayed.

clearAltText() method can be used to clear the altText, this will cause the element to display the token or actual value of the element. If the element has no token, the element will be empty.

Reveal data with Skyflow Elements

End-to-end example of revealing data with Skyflow Elements

// Initialize skyflow configuration
let config = Skyflow.Configuration(vaultID: <VAULT_ID>, vaultURL: <VAULT_URL>, tokenProvider: demoTokenProvider)

// Initialize skyflow client
let skyflowClient = Skyflow.initialize(config)

// Create a Reveal Container
let container = skyflowClient.container(type: Skyflow.ContainerType.REVEAL)

// Create Skyflow.Styles with individual Skyflow.Style variants
let baseStyle = Skyflow.Style(borderColor: UIColor.blue)
let baseTextStyle = Skyflow.Style(textColor: UIColor.BLACK)
let inputStyles = Skyflow.Styles(base: baseStyle)
let labelStyles = Skyflow.Styles(base: baseTextStyle)
let errorTextStyles = Skyflow.Styles(base: baseTextStyle)

// Create Reveal Elements
let cardNumberInput = Skyflow.RevealElementInput(
    token: "b63ec4e0-bbad-4e43-96e6-6bd50f483f75",
    inputStyles: inputStyles,
    labelStyles: labelStyles,
    errorTextStyles: errorTextStyles,
    label: "cardnumber",
    altText: "XXXX XXXX XXXX XXXX",
    redaction: SKyflow.RedactionType.MASKED
)

let cardNumberElement = container?.create(input: cardNumberInput)

let cvvInput = Skyflow.RevealElementInput(
    token: "89024714-6a26-4256-b9d4-55ad69aa4047",
    inputStyles: inputStyles,
    labelStyles: labelStyles,
    errorTextStyles: errorTextStyles,
    label: "cvv",
    altText: "XXX"
)
let cvvElement = container?.create(input: cvvInput)

let expiryDateInput = Skyflow.RevealElementInput(
    token: "a4b24714-6a26-4256-b9d4-55ad69aa4047",
    inputStyles: inputStyles,
    labelStyles: labelStyles,
    errorTextStyles: errorTextStyles,
    label: "expiryDate",
    altText: "MM/YYYY"
)
let expiryDateElement = container?.create(input: expiryDateInput)

// Can interact with these objects as a normal UIView Object and add to View

// set error to the element
cvvElement!.setError("custom error")
// reset error to the element
cvvElement!.resetError()

// Implement a custom Skyflow.Callback to be called on Reveal success/failure
public class RevealCallback: Skyflow.Callback {
    public func onSuccess(_ responseBody: Any) {
        print(responseBody)
    }
    public func onFailure(_ error: Any) {
        print(error)
    }
}

// Initialize custom Skyflow.Callback
let revealCallback = RevealCallback()

// Call reveal method on RevealContainer
container?.reveal(callback: revealCallback)

The response below shows that some tokens assigned to the reveal elements get revealed successfully, while others fail and remain unrevealed.

Sample Response:

{
    "success": [ {
        "token": "b63ec4e0-bbad-4e43-96e6-6bd50f483f75"
    },
    {
        "token": "89024714-6a26-4256-b9d4-55ad69aa4047"
    }],
    "errors": [ {
        "id": "a4b24714-6a26-4256-b9d4-55ad69aa4047",
        "error": {
            "code": 404,
            "description": "Tokens not found for a4b24714-6a26-4256-b9d4-55ad69aa4047"
        }
    }]
}

Reporting a Vulnerability

If you discover a potential security issue in this project, please reach out to us at [email protected]. Please do not create public GitHub issues or Pull Requests, as malicious actors could potentially view them.