whisk / skadnetwork

SKAdNetwork postbacks validator written in Golang

Description

This package provides a validator for Apple SKAdNetwork postbacks, covering both JSON schema validation and signature verification for versions from 2.1 up to 4.0.

Installation

go get github.com/whisk/skadnetwork

Usage

validator := skadnetwork.NewPostbackValidator()
ok, err := validator.Validate(jsonBytes)
if err != nil {
    fmt.Fprintf(os.Stderr, "Error validating postback: %s\n", err)
    os.Exit(1)
}
if !ok {
    fmt.Println("Postback is not valid. Errors found:")
    for _, e := range validator.Errors() {
        fmt.Println(e.Error())
    }
    os.Exit(1)
}
fmt.Println("Postback is valid")

Known issues

• Versions 2.0 and older are not supported due to difficulties with P-192 public key verification
• JSON schema validation does not cover all edge cases, for example, the mutual exclusion of source-domain and source-app-id params
• Any extra params in the postback are not checked or validated