public AuthCodeGrant CreateAuthorizationCodeGrant(TestOAuth2ServerTokenGenerator generator,
string[] scopes, string redirectUri, string codeChallenge, OAuth2PkceChallengeMethod codeChallengeMethod)
{
string code = generator.CreateAuthorizationCode();
var grant = new AuthCodeGrant(code, scopes, redirectUri, codeChallenge, codeChallengeMethod);
AuthGrants.Add(grant);
return(grant);
}
public TokenEndpointResponseJson CreateTokenByAuthorizationGrant(
TestOAuth2ServerTokenGenerator generator, string authCode, string codeVerifier, string redirectUri)
{
var grant = AuthGrants.FirstOrDefault(x => x.Code == authCode);
if (grant is null)
{
throw new Exception($"Invalid authorization code '{authCode}'");
}
// Validate the grant's code challenge was constructed from the given code verifier
if (!string.IsNullOrWhiteSpace(grant.CodeChallenge))
{
if (string.IsNullOrWhiteSpace(codeVerifier))
{
throw new Exception("Missing code verifier");
}
switch (grant.CodeChallengeMethod)
{
case OAuth2PkceChallengeMethod.Sha256:
using (var sha256 = SHA256.Create())
{
string challenge = Base64UrlConvert.Encode(
sha256.ComputeHash(
Encoding.ASCII.GetBytes(codeVerifier)
),
false
);
if (challenge != grant.CodeChallenge)
{
throw new Exception($"Invalid code verifier '{codeVerifier}'");
}
}
break;
case OAuth2PkceChallengeMethod.Plain:
// The case matters!
if (!StringComparer.Ordinal.Equals(codeVerifier, grant.CodeChallenge))
{
throw new Exception($"Invalid code verifier '{codeVerifier}'");
}
break;
}
}
// If an explicit redirect URI was used as part of the authorization request then
// the redirect URI used for the token call must match exactly.
if (!string.IsNullOrWhiteSpace(grant.RedirectUri) && !StringComparer.Ordinal.Equals(grant.RedirectUri, redirectUri))
{
throw new Exception("Redirect URI must match exactly the one used when requesting the authorization code.");
}
string accessToken = generator.CreateAccessToken();
string refreshToken = generator.CreateRefreshToken();
// Remove the auth code grant now we've generated an access token (do not allow auth code reuse)
AuthGrants.Remove(grant);
// Store the tokens
AccessTokens[accessToken] = refreshToken;
RefreshTokens[refreshToken] = grant.Scopes;
return(new TokenEndpointResponseJson
{
TokenType = Constants.Http.WwwAuthenticateBearerScheme,
AccessToken = accessToken,
RefreshToken = refreshToken,
Scope = string.Join(" ", grant.Scopes) // Keep the same scopes as before
});
}