recaptcha pkg

1 files changed, 75 insertions, 0 deletions

diff --git a/recaptcha.go b/recaptcha.go
new file mode 100644
index 0000000..a5b35c6
--- /dev/null
+++ b/recaptcha.go
@@ -0,0 +1,75 @@
+package recaptcha
+
+import (
+    "errors"
+    "net/http"
+    "net/url"
+    "encoding/json"
+)
+
+const (
+    verifyURL = "https://www.google.com/recaptcha/api/siteverify"
+)
+
+var (
+    ErrSecretMissing   = errors.New("reCaptcha secret is missing.")
+    ErrSecretInvalid   = errors.New("reCaptcha secret is invalid.")
+    ErrResponseMissing = errors.New("reCaptcha response is missing.")
+    ErrResponseInvalid = errors.New("reCaptcha response is invalid.")
+)
+
+type Response struct {
+    Success     bool     `json:"success"`
+    // Errors from reCaptcha service
+    ErrorCodes  []string `json:"error-codes"`
+    // Our errors to caller
+    Errors      []error  `json:"-"`
+}
+
+// Translate error code into error
+func (r *Response) getErrorFromCode(code string) error {
+    switch code {
+    case "missing-input-secret":
+        return ErrSecretMissing
+    case "invalid-input-secret":
+        return ErrSecretInvalid
+    case "missing-input-response":
+        return ErrResponseMissing
+    case "invalid-input-response":
+        return ErrResponseInvalid
+    default:
+        return nil
+    }
+}
+
+// Translate reCaptcha error codes into errors
+func (r *Response) populateErrors() {
+    for _, code := range r.ErrorCodes {
+        r.Errors = append(r.Errors, r.getErrorFromCode(code))
+    }
+}
+
+func Verify(secret string, response string, remoteip string) (*Response, error) {
+
+    values := make(url.Values)
+    values.Set("secret", secret)
+    values.Set("response", response)
+
+    resp, err := http.Get(verifyURL + "?" + values.Encode())
+    if err != nil {
+        return nil, err
+
+    }
+
+    defer resp.Body.Close()
+
+    // Collect the response into struct
+    recaptchaResponse := new(Response)
+    err = json.NewDecoder(resp.Body).Decode(recaptchaResponse); if err != nil {
+        return nil, err
+    }
+
+    recaptchaResponse.populateErrors()
+
+    return recaptchaResponse, nil
+}