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Keygen reference SDK for Go. Integrate license activation, automatic updates and offline licensing for Go binaries.

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Keygen Go SDK

godoc reference CI

Package keygen allows Go programs to license and remotely update themselves using the keygen.sh service.

Installing

go get github.com/keygen-sh/keygen-go/v3

Config

keygen.Account

Account is your Keygen account ID used globally in the SDK. All requests will be made to this account. This should be hard-coded into your app.

keygen.Account = "1fddcec8-8dd3-4d8d-9b16-215cac0f9b52"

keygen.Product

Product is your Keygen product ID used globally in the SDK. All license validations and upgrade requests will be scoped to this product. This should be hard-coded into your app.

keygen.Product = "1f086ec9-a943-46ea-9da4-e62c2180c2f4"

keygen.LicenseKey

LicenseKey is a license key belonging to the end-user (licensee). This will be used for license validations, activations, deactivations and upgrade requests. You will need to prompt the end-user for this value.

You will need to set the license policy's authentication strategy to LICENSE or MIXED.

Setting LicenseKey will take precedence over Token.

keygen.LicenseKey = "C1B6DE-39A6E3-DE1529-8559A0-4AF593-V3"

keygen.Token

Token is an activation token belonging to the licensee. This will be used for license validations, activations, deactivations and upgrade requests. You will need to prompt the end-user for this.

You will need to set the license policy's authentication strategy to TOKEN or MIXED.

keygen.Token = "activ-d66e044ddd7dcc4169ca9492888435d3v3"

keygen.PublicKey

PublicKey is your Keygen account's hex-encoded Ed25519 public key, used for verifying signed license keys and API response signatures. When set, API response signatures will automatically be verified. You may leave it blank to skip verifying response signatures. This should be hard-coded into your app.

keygen.PublicKey = "e8601e48b69383ba520245fd07971e983d06d22c4257cfd82304601479cee788"

keygen.Logger

Logger is a leveled logger implementation used for printing debug, informational, warning, and error messages. The default log level is LogLevelError. You may provide your own logger which implements LeveledLogger.

keygen.Logger = &CustomLogger{Level: keygen.LogLevelDebug}

Usage

The following top-level functions are available. We recommend starting here.

keygen.Validate(ctx, fingerprints ...string)

To validate a license, configure keygen.Account and keygen.Product with your Keygen account details. Then prompt the end-user for their license key or token and set keygen.LicenseKey or keygen.Token, respectively.

The Validate method accepts zero or more fingerprints, which can be used to scope a license validation to a particular device fingerprint and its hardware components. The first fingerprint should be a machine fingerprint, and the rest are optional component fingerprints.

It will return a License object as well as any validation errors that occur. The License object can be used to perform additional actions, such as license.Activate(fingerprint).

license, err := keygen.Validate(context.Background(), fingerprint)
switch {
case err == keygen.ErrLicenseNotActivated:
  panic("license is not activated!")
case err == keygen.ErrLicenseExpired:
  panic("license is expired!")
case err != nil:
  panic("license is invalid!")
}

fmt.Println("License is valid!")

keygen.Upgrade(ctx, options keygen.UpgradeOptions)

Check for an upgrade. When an upgrade is available, a Release will be returned which will allow the update to be installed, replacing the currently running binary. When an upgrade is not available, an ErrUpgradeNotAvailable error will be returned indicating the current version is up-to-date.

When a PublicKey is provided, and the release has a Signature, the signature will be cryptographically verified using Ed25519ph before installing. The PublicKey MUST be a personal Ed25519ph public key. It MUST NOT be your Keygen account's public key (method will panic if public keys match).

You can read more about generating a personal keypair and about code signing here.

opts := keygen.UpgradeOptions{CurrentVersion: "1.0.0", Channel: "stable", PublicKey: "5ec69b78d4b5d4b624699cef5faf3347dc4b06bb807ed4a2c6740129f1db7159"}

ctx := context.Background()

// Check for an upgrade
release, err := keygen.Upgrade(ctx, opts)
switch {
case err == keygen.ErrUpgradeNotAvailable:
  fmt.Println("No upgrade available, already at the latest version!")

  return
case err != nil:
  fmt.Println("Upgrade check failed!")

  return
}

// Install the upgrade
if err := release.Install(ctx); err != nil {
  panic("upgrade install failed!")
}

fmt.Println("Upgrade complete! Please restart.")

To quickly generate a keypair, use Keygen's CLI:

keygen genkey

Examples

Below are various implementation examples, covering common licensing scenarios and use cases.

License Activation

Validate the license for a particular device fingerprint, and activate when needed. We're using machineid for fingerprinting, which is cross-platform, using the operating system's native GUID.

package main

import (
  "context"

  "github.com/keygen-sh/keygen-go/v3"
  "github.com/keygen-sh/machineid"
)

func main() {
  keygen.Account = "YOUR_KEYGEN_ACCOUNT_ID"
  keygen.Product = "YOUR_KEYGEN_PRODUCT_ID"
  keygen.LicenseKey = "A_KEYGEN_LICENSE_KEY"

  fingerprint, err := machineid.ProtectedID(keygen.Product)
  if err != nil {
    panic(err)
  }

  ctx := context.Background()

  // Validate the license for the current fingerprint
  license, err := keygen.Validate(ctx, fingerprint)
  switch {
  case err == keygen.ErrLicenseNotActivated:
    // Activate the current fingerprint
    machine, err := license.Activate(ctx, fingerprint)
    switch {
    case err == keygen.ErrMachineLimitExceeded:
      panic("machine limit has been exceeded!")
    case err != nil:
      panic("machine activation failed!")
    }
  case err == keygen.ErrLicenseExpired:
    panic("license is expired!")
  case err != nil:
    panic("license is invalid!")
  }

  fmt.Println("License is activated!")
}

Automatic Upgrades

Check for an upgrade and automatically replace the current binary with the newest version.

package main

import (
  "context"

  "github.com/keygen-sh/keygen-go/v3"
)

// The current version of the program
const CurrentVersion = "1.0.0"

func main() {
  keygen.PublicKey = "YOUR_KEYGEN_PUBLIC_KEY"
  keygen.Account = "YOUR_KEYGEN_ACCOUNT_ID"
  keygen.Product = "YOUR_KEYGEN_PRODUCT_ID"
  keygen.LicenseKey = "A_KEYGEN_LICENSE_KEY"

  fmt.Printf("Current version: %s\n", CurrentVersion)
  fmt.Println("Checking for upgrades...")

  ctx := context.Background()

  opts := keygen.UpgradeOptions{CurrentVersion: CurrentVersion, Channel: "stable", PublicKey: "YOUR_COMPANY_PUBLIC_KEY"}

  // Check for upgrade
  release, err := keygen.Upgrade(ctx, opts)
  switch {
  case err == keygen.ErrUpgradeNotAvailable:
    fmt.Println("No upgrade available, already at the latest version!")

    return
  case err != nil:
    fmt.Println("Upgrade check failed!")

    return
  }

  fmt.Printf("Upgrade available! Newest version: %s\n", release.Version)
  fmt.Println("Installing upgrade...")

  // Download the upgrade and install it
  err = release.Install(ctx)
  if err != nil {
    panic("upgrade install failed!")
  }

  fmt.Printf("Upgrade complete! Installed version: %s\n", release.Version)
  fmt.Println("Restart to finish installation...")
}

Monitor Machine Heartbeats

Monitor a machine's heartbeat, and automatically deactivate machines in case of a crash or an unresponsive node. We recommend using a random UUID fingerprint for activating nodes in cloud-based scenarios, since nodes may share underlying hardware.

package main

import (
  "context"

  "github.com/google/uuid"
  "github.com/keygen-sh/keygen-go/v3"
)

func main() {
  keygen.Account = "YOUR_KEYGEN_ACCOUNT_ID"
  keygen.Product = "YOUR_KEYGEN_PRODUCT_ID"
  keygen.LicenseKey = "A_KEYGEN_LICENSE_KEY"

  // The current device's fingerprint (could be e.g. MAC, mobo ID, GUID, etc.)
  fingerprint := uuid.New().String()

  ctx := context.Background()

  // Keep our example process alive
  done := make(chan bool, 1)

  // Validate the license for the current fingerprint
  license, err := keygen.Validate(ctx, fingerprint)
  switch {
  case err == keygen.ErrLicenseNotActivated:
    // Activate the current fingerprint
    machine, err := license.Activate(ctx, fingerprint)
    if err != nil {
      fmt.Println("machine activation failed!")

      panic(err)
    }

    // Handle SIGINT and gracefully deactivate the machine
    sigs := make(chan os.Signal, 1)

    signal.Notify(sigs, os.Interrupt)

    go func() {
      for sig := range sigs {
        fmt.Printf("Caught %v, deactivating machine and gracefully exiting...\n", sig)

        if err := machine.Deactivate(ctx); err != nil {
          panic(err)
        }

        fmt.Println("Machine was deactivated!")
        fmt.Println("Exiting...")

        done <- true
      }
    }()

    // Start a heartbeat monitor for the current machine
    if err := machine.Monitor(ctx); err != nil {
      fmt.Println("Machine heartbeat monitor failed to start!")

      panic(err)
    }

    fmt.Println("Machine is activated and monitored!")
  case err != nil:
    fmt.Println("License is invalid!")

    panic(err)
  }

  fmt.Println("License is valid!")

  <-done
}

Offline License Files

Cryptographically verify and decrypt an encrypted license file. This is useful for checking if a license file is genuine in offline or air-gapped environments. Returns the license file's dataset and any errors that occurred during verification and decryption, e.g. ErrLicenseFileNotGenuine.

When decrypting a license file, you MUST provide the license's key as the decryption key.

When initializing a LicenseFile, Certificate is required.

Requires that keygen.PublicKey is set.

package main

import "github.com/keygen-sh/keygen-go/v3"

func main() {
  keygen.PublicKey = "YOUR_KEYGEN_PUBLIC_KEY"

  // Read the license file
  cert, err := ioutil.ReadFile("/etc/example/license.lic")
  if err != nil {
    panic("license file is missing")
  }

  // Verify the license file's signature
  lic := &keygen.LicenseFile{Certificate: string(cert)}
  err = lic.Verify()
  switch {
  case err == keygen.ErrLicenseFileNotGenuine:
    panic("license file is not genuine!")
  case err != nil:
    panic(err)
  }

  // Use the license key to decrypt the license file
  dataset, err := lic.Decrypt("A_KEYGEN_LICENSE_KEY")
  switch {
  case err == keygen.ErrSystemClockUnsynced:
    panic("system clock tampering detected!")
  case err == keygen.ErrLicenseFileExpired:
    panic("license file is expired!")
  case err != nil:
    panic(err)
  }

  fmt.Println("License file is genuine!")
  fmt.Printf("Decrypted dataset: %v\n", dataset)
}

Offline License Keys

Cryptographically verify and decode a signed license key. This is useful for checking if a license key is genuine in offline or air-gapped environments. Returns the key's decoded dataset and any errors that occurred during cryptographic verification, e.g. ErrLicenseKeyNotGenuine.

When initializing a License, Scheme and Key are required.

Requires that keygen.PublicKey is set.

package main

import "github.com/keygen-sh/keygen-go/v3"

func main() {
  keygen.PublicKey = "YOUR_KEYGEN_PUBLIC_KEY"

  // Verify the license key's signature and decode embedded dataset
  license := &keygen.License{Scheme: keygen.SchemeCodeEd25519, Key: "A_SIGNED_KEYGEN_LICENSE_KEY"}
  dataset, err := license.Verify()
  switch {
  case err == keygen.ErrLicenseKeyNotGenuine:
    panic("license key is not genuine!")
  case err != nil:
    panic(err)
  }

  fmt.Println("License is genuine!")
  fmt.Printf("Decoded dataset: %s\n", dataset)
}

Verify Webhooks

When listening for webhook events from Keygen, you can verify requests came from Keygen's servers by using keygen.VerifyWebhook. This protects your webhook endpoint from event forgery and replay attacks.

Requires that keygen.PublicKey is set.

package main

import (
  "log"
  "net/http"

  "github.com/keygen-sh/keygen-go/v3"
)

func main() {
  keygen.PublicKey = "YOUR_KEYGEN_PUBLIC_KEY"

  http.HandleFunc("/webhooks", func(w http.ResponseWriter, r *http.Request) {
    if err := keygen.VerifyWebhook(r); err != nil {
      w.WriteHeader(http.StatusBadRequest)

      return
    }

    w.WriteHeader(http.StatusNoContent)
  })

  log.Fatal(http.ListenAndServe(":8081", nil))
}

Error Handling

Our SDK tries to return meaningful errors which can be handled in your integration. Below are a handful of error recipes that can be used for the more common errors.

Invalid License Key

When authenticating with a license key, you may receive a LicenseKeyError when the license key does not exist. You can handle this accordingly.

package main

import (
  "context"

  "github.com/keygen-sh/keygen-go/v3"
)

func getLicense(ctx context.Context) (*keygen.License, error) {
  keygen.LicenseKey = promptForLicenseKey()

  license, err := keygen.Validate(ctx)
  if err != nil {
    if _, ok := err.(*keygen.LicenseKeyError); ok {
      fmt.Println("License key does not exist!")

      return getLicense(ctx)
    }

    return nil, err
  }

  return license, nil
}

func main() {
  keygen.Account = "..."
  keygen.Product = "..."

  ctx := context.Background()

  license, err := getLicense(ctx)
  if err != nil {
    panic(err)
  }

  fmt.Printf("License: %v\n", license)
}

Invalid License Token

When authenticating with a license token, you may receive a LicenseTokenError when the license token does not exist or has expired. You can handle this accordingly.

package main

import "github.com/keygen-sh/keygen-go/v3"

func getLicense(ctx context.Context) (*keygen.License, error) {
  keygen.Token = promptForLicenseToken()

  license, err := keygen.Validate(ctx)
  if err != nil {
    if _, ok := err.(*keygen.LicenseTokenError); ok {
      fmt.Println("License token does not exist!")

      return getLicense(ctx)
    }

    return nil, err
  }

  return license, nil
}

func main() {
  keygen.Account = "..."
  keygen.Product = "..."

  ctx := context.Background()

  license, err := getLicense(ctx)
  if err != nil {
    panic(err)
  }

  fmt.Printf("License: %v\n", license)
}

Rate Limiting

When your integration makes too many requests too quickly, the IP address may be rate limited. You can handle this via the RateLimitError error. For example, you could use this error to determine how long to wait before retrying a request.

package main

import "github.com/keygen-sh/keygen-go/v3"

func validate(ctx context.Context) (*keygen.License, error) {
  license, err := keygen.Validate(ctx)
  if err != nil {
    if e, ok := err.(*keygen.RateLimitError); ok {
      // Sleep until our rate limit window is passed
      time.Sleep(time.Duration(e.RetryAfter) * time.Second)

      // Retry validate
      return validate(ctx)
    }

    return nil, err
  }

  return license, nil
}

func main() {
  keygen.Account = "YOUR_KEYGEN_ACCOUNT_ID"
  keygen.Product = "YOUR_KEYGEN_PRODUCT_ID"
  keygen.LicenseKey = "A_KEYGEN_LICENSE_KEY"

  ctx := context.Background()

  license, err := validate(ctx)
  if err != nil {
    panic(err)
  }

  fmt.Printf("License: %v\n", license)
}

You may want to add a limit to the number of retry attempts.

Automatic retries

When your integration has less-than-stellar network connectivity, or you simply want to ensure that failed requests are retried, you can utilize a package such as retryablehttp to implement automatic retries.

package main

import (
  "context"

  "github.com/hashicorp/go-retryablehttp"
  "github.com/keygen-sh/keygen-go/v3"
)

func main() {
  c := retryablehttp.NewClient()

  // Configure with a jitter backoff and max attempts
  c.Backoff = retryablehttp.LinearJitterBackoff
  c.RetryMax = 5

  keygen.HTTPClient = c.StandardClient()
  keygen.Account = "YOUR_KEYGEN_ACCOUNT_ID"
  keygen.Product = "YOUR_KEYGEN_PRODUCT_ID"
  keygen.LicenseKey = "A_KEYGEN_LICENSE_KEY"

  ctx := context.Background()

  // Use SDK as you would normally
  keygen.Validate(ctx)
}

Testing

When implementing a testing strategy for your licensing integration, we recommend that you fully mock our APIs. This is especially important for CI/CD environments, to prevent unneeded load on our servers. Mocking our APIs will also allow you to more easily stay within your account's daily request limits.

To do so in Go, you can utilize gock or httptest.

package main

import (
  "context"
  "testing"

  "github.com/keygen-sh/keygen-go/v3"
  "gopkg.in/h2non/gock.v1"
)

func init() {
  keygen.PublicKey = "e8601e48b69383ba520245fd07971e983d06d22c4257cfd82304601479cee788"
  keygen.Account = "1fddcec8-8dd3-4d8d-9b16-215cac0f9b52"
  keygen.Product = "1f086ec9-a943-46ea-9da4-e62c2180c2f4"
  keygen.LicenseKey = "C1B6DE-39A6E3-DE1529-8559A0-4AF593-V3"
}

func TestExample(t *testing.T) {
  ctx := context.Background()
  defer gock.Off()

  // Intercept Keygen's HTTP client
  gock.InterceptClient(keygen.HTTPClient)
  defer gock.RestoreClient(keygen.HTTPClient)

  // Mock endpoints
  gock.New("https://api.keygen.sh").
    Get(`/v1/accounts/([^\/]+)/me`).
    Reply(200).
    SetHeader("Keygen-Signature", `keyid="1fddcec8-8dd3-4d8d-9b16-215cac0f9b52", algorithm="ed25519", signature="IiyYX1ah2HFzbcCx+3sv+KJpOppFdMRuZ7NWlnwZMKAf5khj9c4TO4z6fr62BqNXlyROOTxZinX8UpXHJHVyAw==", headers="(request-target) host date digest"`).
    SetHeader("Digest", "sha-256=d4uZ26hjiUNqopuSkYcYwg2aBuNtr4D1/9iDhlvf0H8=").
    SetHeader("Date", "Wed, 15 Jun 2022 18:52:14 GMT").
    BodyString(`{"data":{"id":"218810ed-2ac8-4c26-a725-a6da67500561","type":"licenses","attributes":{"name":"Demo License","key":"C1B6DE-39A6E3-DE1529-8559A0-4AF593-V3","expiry":null,"status":"ACTIVE","uses":0,"suspended":false,"scheme":null,"encrypted":false,"strict":false,"floating":false,"concurrent":false,"protected":true,"maxMachines":1,"maxProcesses":null,"maxCores":null,"maxUses":null,"requireHeartbeat":false,"requireCheckIn":false,"lastValidated":"2022-06-15T18:52:12.068Z","lastCheckIn":null,"nextCheckIn":null,"metadata":{"email":"[email protected]"},"created":"2020-09-14T21:18:08.990Z","updated":"2022-06-15T18:52:12.073Z"},"relationships":{"account":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52"},"data":{"type":"accounts","id":"1fddcec8-8dd3-4d8d-9b16-215cac0f9b52"}},"product":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/product"},"data":{"type":"products","id":"ef6e0993-70d6-42c4-a0e8-846cb2e3fa54"}},"policy":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/policy"},"data":{"type":"policies","id":"629307fb-331d-430b-978a-44d45d9de133"}},"group":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/group"},"data":null},"user":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/user"},"data":null},"machines":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/machines"},"meta":{"cores":0,"count":1}},"tokens":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/tokens"}},"entitlements":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/entitlements"}}},"links":{"self":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561"}}}`)

  gock.New("https://api.keygen.sh").
    Post(`/v1/accounts/([^\/]+)/licenses/([^\/]+)/actions/validate`).
    Reply(200).
    SetHeader("Keygen-Signature", `keyid="1fddcec8-8dd3-4d8d-9b16-215cac0f9b52", algorithm="ed25519", signature="18+5Q4749BKuUz9/f35UrdP5g3Pyt32pPN3J8e5BqSlRbqiXnz0HwtqbP5sbvGkq1yixelwgV6bcJ0WUtpDSBw==", headers="(request-target) host date digest"`).
    SetHeader("Digest", "sha-256=c1y1CVVLG0mvt0MP1SJy/bOiNjCytxMOuHUhlCXXVVk=").
    SetHeader("Date", "Thu, 09 Feb 2023 21:20:13 GMT").
    BodyString(`{"data":{"id":"218810ed-2ac8-4c26-a725-a6da67500561","type":"licenses","attributes":{"name":"Demo License","key":"C1B6DE-39A6E3-DE1529-8559A0-4AF593-V3","expiry":null,"status":"ACTIVE","uses":0,"suspended":false,"scheme":null,"encrypted":false,"strict":false,"floating":false,"protected":true,"maxMachines":1,"maxProcesses":null,"maxCores":null,"maxUses":null,"requireHeartbeat":false,"requireCheckIn":false,"lastValidated":"2023-02-09T21:20:13.679Z","lastCheckIn":null,"nextCheckIn":null,"lastCheckOut":null,"metadata":{"email":"[email protected]"},"created":"2020-09-14T21:18:08.990Z","updated":"2023-02-09T21:20:13.691Z"},"relationships":{"account":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52"},"data":{"type":"accounts","id":"1fddcec8-8dd3-4d8d-9b16-215cac0f9b52"}},"product":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/product"},"data":{"type":"products","id":"ef6e0993-70d6-42c4-a0e8-846cb2e3fa54"}},"policy":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/policy"},"data":{"type":"policies","id":"629307fb-331d-430b-978a-44d45d9de133"}},"group":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/group"},"data":null},"user":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/user"},"data":null},"machines":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/machines"},"meta":{"cores":0,"count":1}},"tokens":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/tokens"}},"entitlements":{"links":{"related":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561/entitlements"}}},"links":{"self":"/v1/accounts/1fddcec8-8dd3-4d8d-9b16-215cac0f9b52/licenses/218810ed-2ac8-4c26-a725-a6da67500561"}},"meta":{"ts":"2023-02-09T21:20:13.696Z","valid":true,"detail":"is valid","code":"VALID"}}`)

  // Allow old response signatures
  keygen.MaxClockDrift = -1

  // Use SDK as you would normally
  _, err := keygen.Validate(ctx)
  if err != nil {
    t.Fatalf("Should not fail mock validation: err=%v", err)
  }
}

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Keygen reference SDK for Go. Integrate license activation, automatic updates and offline licensing for Go binaries.

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license.go

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