public static async Task <TokenResponse> AcquireTokenAsync(AcquireTokenRequest request)
{
using (var httpClient = new HttpClient())
{
var postBody = new Dictionary <string, string>
{
["client_id"] = request.ClientId,
["grant_type"] = "authorization_code",
["scope"] = string.Join(" ", M365Helper.EmailScopes),
["code"] = request.ResponseCode,
["redirect_uri"] = request.RedirectUri,
["client_secret"] = request.Secret,
["code_verifier"] = request.CodeVerifier
};
var httpRequest =
new HttpRequestMessage(HttpMethod.Post, M365Helper.BuildTokenUri(request.Tenant))
{
Content = new FormUrlEncodedContent(postBody)
};
var httpResponse = await httpClient.SendAsync(httpRequest);
string responseString = await httpResponse.Content.ReadAsStringAsync();
var tokenResponse = JsonSerializer.Deserialize <TokenResponse>(responseString);
return(tokenResponse);
}
}
public static OAuth2AuthRequest CreateRequest(string email, string clientId, string redirect, string[] scopes)
{
string tenant = email.Split('@')[1];
string codeVerifier = Guid.NewGuid().ToString().Replace('-', '\0');
var request = new OAuth2AuthRequest
{
AuthUri = M365Helper.BuildAuthorizeUri(tenant),
ClientId = clientId,
Redirect = redirect,
CodeChallenge = EncryptionHelper.CreateChallengeCode(codeVerifier),
State = EncryptionHelper.Encrypt($"{tenant}#{clientId}#{codeVerifier}#{email}"),
Scopes = string.Join(" ", scopes)
};
return(request);
}
public static async Task <TokenResponse> RefreshTokenAsync(RefreshTokenRequest request)
{
using (var httpClient = new HttpClient())
{
var httpRequest = new HttpRequestMessage(HttpMethod.Post, M365Helper.BuildTokenUri(request.Tenant))
{
Content = new FormUrlEncodedContent(new Dictionary <string, string>
{
["client_id"] = request.ClientId,
["scope"] = string.Join(" ", request.Scopes),
["refresh_token"] = request.RefreshToken,
["grant_type"] = "refresh_token",
["client_secret"] = request.Secret
})
};
var response = await httpClient.SendAsync(httpRequest);
var content = await response.Content.ReadAsStringAsync();
var token = JsonSerializer.Deserialize <TokenResponse>(content);
return(token);
}
}