如何用React和Door门将来实现PKCE OAuth2？

Question

我创建了一个Rails应用程序，其中有Devise和Doorkeeper，用于身份验证，并将其作为一个API使用OAuth2 PKCE作为一个React。

预期行为：

当我用在B中接收的代码发送POST请求时，返回身份验证令牌

实际行为

它返回此错误，而不是返回令牌：

{
  "error": "invalid_grant",
  "error_description": "The provided authorization grant is invalid, expired, revoked, does not match the redirection URI used in the authorization request, or was issued to another client.",
}

如何再现错误：

• 对于：

1. expo init auth-pkce-app -->选择Typescrit空白模板
2. expo install expo-linking expo-web-browser js-sha256
3. 然后将App.tsx中的代码替换为：

import React, { useEffect, useState } from "react";
import { Button, StyleSheet, Text, View } from "react-native";
import * as Linking from "expo-linking";
import * as WebBrowser from "expo-web-browser";
import { sha256 } from "js-sha256";

const CLIENT_ID = "Ox8_PbOB3g9kBy1HsuEWm6ieePS35jQWcaP_a2D6EmU";
const CLIENT_SECRET = "Z2TJo0AZeseyVvpua7piCPTBXA2v2pIAI3aBKpP1n8c";

const CODE_VERIFIER = "Antante";
const code_challenge = sha256(CODE_VERIFIER);
const code_chanllenge_method = "S256";
const AUTHORIZE_URL =
  `http://localhost:3000/oauth/authorize` +
  `?client_id=${CLIENT_ID}` +
  `&redirect_uri=${Linking.createURL("")}` +
  `&response_type=code` +
  `&scope=write` +
  `&code_challenge=${code_challenge}` +
  `&code_challenge_method=${code_chanllenge_method}`;
  
const TOKEN_URL =
  "http://localhost:3000/oauth/token" +
  `?client_id=${CLIENT_ID}` +
  `&client_secret=${CLIENT_SECRET}` +
  "&grant_type=authorization_code" +
  `&code_verifier=${CODE_VERIFIER}` +
  `&redirect_uri=${Linking.createURL("")}`;

const App: React.FC<{}> = () => {
  const [state, setState] = useState<{
    redirectData?: Linking.ParsedURL | null;
    result?: WebBrowser.WebBrowserAuthSessionResult;
  }>({
    redirectData: null,
  });

  useEffect(() => {
    fetchToken();
  }, [state]);

  const fetchToken = async () => {
    try {
      const response = await fetch(
        TOKEN_URL + `&code=${state.redirectData?.queryParams.code}`,
        {
          method: "POST",
        }
      );
      const data = await response.json();
      console.log(data);
    } catch (err) {
      console.log(err);
    }
  };

  const openAuthSessionAsync = async () => {
    try {
      let result = await WebBrowser.openAuthSessionAsync(
        AUTHORIZE_URL,
        Linking.createURL("")
      );
      let redirectData;
      if (result.type === "success") {
        redirectData = Linking.parse(result.url);
      }
      setState({ result, redirectData });
    } catch (error) {
      alert(error);
      console.log(error);
    }
  };

  const maybeRenderRedirectData = () => {
    if (!state.redirectData) {
      return;
    }
    console.log(state.redirectData);

    return (
      <Text style={{ marginTop: 30 }}>
        {JSON.stringify(state.redirectData)}
      </Text>
    );
  };

  return (
    <View style={styles.container}>
      <Button onPress={openAuthSessionAsync} title="Go to login" />
      <Text>{Linking.createURL("")}</Text>
      {maybeRenderRedirectData()}
    </View>
  );
};

export default App;

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
    alignItems: "center",
    justifyContent: "center",
    paddingBottom: 40,
  },
  header: {
    fontSize: 25,
    marginBottom: 25,
  },
});

1. 使用yarn start和<<启动应用程序，请记住重定向链接，按钮标记为“Go to login”>>

• 用于Rails应用程序和

1. git clone git@github.com:dogaruemiliano/pkce-auth.git rails-pkce-auth
2. bundle install
3. 转到db/seeds.rb，将文件顶部的链接(REDIRECT_URI = 'exp://192.168.0.107:19000')替换为我们前面提到的链接。
4. rails db:migrate db:seed

^这将在终端中输出Door蛋：：应用程序的详细信息(id，保密)

1. rails g webpacker:install
2. 钢轨

Answer 1

问题在于sha256编码。在您的示例中从js-sha256返回的是基于十六进制的，但是我们需要匹配来自看门人的base64编码sha256

def generate_code_challenge(code_verifier)
  Base64.urlsafe_encode64(Digest::SHA256.digest(code_verifier), padding: false)
end

通过使用expo-crypto可能更容易实现这一点。

var code_challenge = await Crypto.digestStringAsync(
  Crypto.CryptoDigestAlgorithm.SHA256,
  CODE_VERIFIER,
  {encoding: Crypto.CryptoEncoding.BASE64}
).then(
  digest => digest.replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '')
)

希望能帮上忙。