Django REST reCAPTCHA

Django REST reCAPTCHA v2 and v3 field serializer

Requirements

• Python: 3.10, 3.11, 3.12
• Django: 4.2, 5.0, 5.1
• DRF: 3.14, 3.15

Installation

1. Sign up for reCAPTCHA
2. Install with pip install drf-recaptcha
3. Add "drf_recaptcha" to your INSTALLED_APPS settings.
4. Set in settings DRF_RECAPTCHA_SECRET_KEY

INSTALLED_APPS = [
    ...,
    "drf_recaptcha",
    ...,
]

...

DRF_RECAPTCHA_SECRET_KEY = "YOUR SECRET KEY"

Usage

from rest_framework.serializers import Serializer, ModelSerializer
from drf_recaptcha.fields import ReCaptchaV2Field, ReCaptchaV3Field
from feedback.models import Feedback


class V2Serializer(Serializer):
    recaptcha = ReCaptchaV2Field()
    ...


class GetOTPView(APIView):
    def post(self, request):
        serializer = V2Serializer(data=request.data, context={"request": request})
        serializer.is_valid(raise_exception=True)
        ...


class V3Serializer(Serializer):
    recaptcha = ReCaptchaV3Field(action="example")
    ...


class V3WithScoreSerializer(Serializer):
    recaptcha = ReCaptchaV3Field(
        action="example",
        required_score=0.6,
    )
    ...


class GetReCaptchaScore(APIView):
    def post(self, request):
        serializer = V3WithScoreSerializer(data=request.data, context={"request": request})
        serializer.is_valid()
        score = serializer.fields['recaptcha'].score
        ...


class FeedbackSerializer(ModelSerializer):
    recaptcha = ReCaptchaV2Field()

    class Meta:
        model = Feedback
        fields = ("phone", "full_name", "email", "comment", "recaptcha")

    def validate(self, attrs):
        attrs.pop("recaptcha")
        ...
        return attrs


class DynamicContextSecretKey(APIView):
    def post(self, request):
        if request.platform == "android":
            recaptcha_secret_key = "SPECIAL_FOR_ANDROID"
        else:
            recaptcha_secret_key = "SPECIAL_FOR_IOS"
        serializer = WithReCaptchaSerializer(
            data=request.data,
            context={
                "request": request,
                "recaptcha_secret_key": recaptcha_secret_key,
            },
        )
        serializer.is_valid(raise_exception=True)
        ...


class DynamicContextSecretKey(GenericAPIView):
    serializer_class = WithReCaptchaSerializer

    def get_serializer_context(self):
        if self.request.platform == "android":
            recaptcha_secret_key = "SPECIAL_FOR_ANDROID"
        else:
            recaptcha_secret_key = "SPECIAL_FOR_IOS"
        context = super().get_serializer_context()
        context.update({"recaptcha_secret_key": recaptcha_secret_key})
        return context


class MobileSerializer(Serializer):
    recaptcha = ReCaptchaV3Field(secret_key="SPECIAL_MOBILE_KEY", action="feedback")
    ...

Settings

DRF_RECAPTCHA_SECRET_KEY - set your Google reCAPTCHA secret key. Type: str.

DRF_RECAPTCHA_DEFAULT_V3_SCORE - by default: 0.5. Type: float.

DRF_RECAPTCHA_ACTION_V3_SCORES - by default: {}. Type: dict. You can define specific score for each action e.g. {"login": 0.6, "feedback": 0.3}

DRF_RECAPTCHA_DOMAIN - by default: www.google.com. Type: str.

DRF_RECAPTCHA_PROXY - by default: {}. Type: dict. e.g. {'http': 'http://127.0.0.1:8000', 'https': 'https://127.0.0.1:8000'}

DRF_RECAPTCHA_VERIFY_REQUEST_TIMEOUT - by default: 10. Type: int.

Priority of secret_key value

1. settings DRF_RECAPTCHA_SECRET_KEY
2. the argument secret_key of field
3. request.context["recaptcha_secret_key"]

Silence the check error

If you need to disable the error, you can do so using the django settings.

SILENCED_SYSTEM_CHECKS = ['drf_recaptcha.checks.recaptcha_system_check']

reCAPTCHA v3

Validation is passed if the score value returned by Google is greater than or equal to required score.

Required score value: 0.0 - 1.0

Priority of score value

If not defined or zero in current item then value from next item.

1. Value for action in settings DRF_RECAPTCHA_ACTION_V3_SCORES
2. Value in argument required_score of field
3. Default value in settings DRF_RECAPTCHA_DEFAULT_V3_SCORE
4. Default value 0.5

Testing

Set DRF_RECAPTCHA_TESTING=True in settings, no request to Google, no warnings, DRF_RECAPTCHA_SECRET_KEY is not required, set returning verification result in setting below.

DRF_RECAPTCHA_TESTING_PASS=True|False - all responses are pass, default True.

Use from django.test import override_settings

Credits

django-recaptcha

reCAPTCHA copyright 2012 Google.