Friendly Captcha Go SDK

A Go client for the Friendly Captcha service. This client allows for easy integration and verification of captcha responses and retrieval of risk intelligence data with the Friendly Captcha API.

This library is for Friendly Captcha V2 only. If you are looking for V1, look here

Installation

go get github.com/friendlycaptcha/friendly-captcha-go

Usage

Below are basic examples of how to use the client.

For a more detailed end-to-end example (captcha verification + risk intelligence retrieval in one app), take a look at the example directory.

Initialization

import friendlycaptcha "github.com/friendlycaptcha/friendly-captcha-go"
...
opts := []friendlycaptcha.ClientOption{
		friendlycaptcha.WithAPIKey("YOUR_API_KEY"),
		friendlycaptcha.WithSitekey("YOUR_SITEKEY"),
}
frcClient, err := friendlycaptcha.NewClient(opts...)
if err != nil {
    // handle possible configuration error
}

Captcha Verification

Use VerifyCaptchaResponse for the captcha flow via the siteverify endpoint (/api/v2/captcha/siteverify).

After calling VerifyCaptchaResponse with the captcha response there are two functions on the result object that you should check:

• WasAbleToVerify() indicates whether we were able to verify the captcha response. This will be false in case there was an issue with the network/our service or if there was a mistake in the configuration.
• ShouldAccept() indicates whether the captcha response was correct. If the client is running in non-strict mode (default) and WasAbleToVerify() returned false, this will be true.

Below are some examples of this behaviour.

Verifying a correct captcha response without issues when veryfing:

result := frcClient.VerifyCaptchaResponse(context.TODO(), "CORRECT_CAPTCHA_RESPONSE_HERE")
fmt.Println(result.WasAbleToVerify()) // true
fmt.Println(result.ShouldAccept()) // true

Verifying an incorrect captcha response without issues when veryfing:

result := frcClient.VerifyCaptchaResponse(context.TODO(), "INCORRECT_CAPTCHA_RESPONSE_HERE")
fmt.Println(result.WasAbleToVerify()) // true
fmt.Println(result.ShouldAccept()) // false

Verifying an incorrect captcha response with issues (network issues or bad configuration) when veryfing in non-strict mode (default):

result := frcClient.VerifyCaptchaResponse(context.TODO(), "INCORRECT_CAPTCHA_RESPONSE_HERE")
fmt.Println(result.WasAbleToVerify()) // false
fmt.Println(result.ShouldAccept()) // true

Verifying an incorrect captcha response with issues (network/service issues or bad configuration) when veryfing in strict mode:

frcClient, _ := friendlycaptcha.NewClient(
    ...
    friendlycaptcha.WithStrictMode(true),
)
result := frcClient.VerifyCaptchaResponse(context.TODO(), "INCORRECT_CAPTCHA_RESPONSE_HERE")
fmt.Println(result.WasAbleToVerify()) // false
fmt.Println(result.ShouldAccept()) // false

Risk Intelligence Data Retrieval

Call RetrieveRiskIntelligence to retrieve risk intelligence data from a token via the retrieve endpoint (/api/v2/riskIntelligence/retrieve).

result := frcClient.RetrieveRiskIntelligence(context.TODO(), "RISK_INTELLIGENCE_TOKEN_HERE")
if !result.WasAbleToRetrieve() {
    // handle request/client error, inspect result.RequestError()
    return
}
if !result.IsValid() {
    // handle invalid token, inspect result.Response().Error
    return
}
// The risk intelligence data is available in result.Response().Data.
data := result.Response().Data.RiskIntelligence

Configuration

The client offers several configuration options:

• WithAPIKey: Your Friendly Captcha API key.
• WithSitekey: (Optional) Your Friendly Captcha sitekey. Configure this if you want to ensure that a captcha solution or risk intelligence token was generated from a specific sitekey.
• WithStrictMode: (Optional) In case the client was not able to verify the captcha response at all (for example if there is a network failure or a mistake in configuration), by default the VerifyCaptchaResponse returns True regardless. By passing WithStrictMode(true), it will return false instead: every response needs to be strictly verified.
• WithAPIEndpoint: (Optional) The base API endpoint (used for both captcha verification and risk intelligence retrieval). Shorthands eu or global are also accepted. Default is global.

Development

Run the tests

First run the SDK Test server, then run go test.

docker run -p 1090:1090 friendlycaptcha/sdk-testserver:latest

go test -v -tags=sdkintegration ./...

License

Open source under MIT.