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CEF4Delphi/source/uCEFOAuth2Helper.pas
Salvador Diaz Fau 1d984307ad Updated copyright year
2021-01-01 11:11:30 +01:00

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// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF to embed a chromium-based
// browser in Delphi applications.
//
// The original license of DCEF3 still applies to CEF4Delphi.
//
// For more information about CEF4Delphi visit :
// https://www.briskbard.com/index.php?lang=en&pageid=cef
//
// Copyright © 2021 Salvador Diaz Fau. All rights reserved.
//
// ************************************************************************
// ************ vvvv Original license and comments below vvvv *************
// ************************************************************************
(*
* Delphi Chromium Embedded 3
*
* Usage allowed under the restrictions of the Lesser GNU General Public License
* or alternatively the restrictions of the Mozilla Public License 1.1
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* Unit owner : Henri Gourvest <hgourvest@gmail.com>
* Web site : http://www.progdigy.com
* Repository : http://code.google.com/p/delphichromiumembedded/
* Group : http://groups.google.com/group/delphichromiumembedded
*
* Embarcadero Technologies, Inc is not permitted to use or redistribute
* this source code without explicit permission.
*
*)
unit uCEFOAuth2Helper;
{$I cef.inc}
interface
uses
{$IFDEF DELPHI16_UP}
{$IFDEF MSWINDOWS}WinApi.Windows,{$ENDIF}System.Classes, System.UITypes, System.SysUtils,
{$ELSE}
{$IFDEF MSWINDOWS}Windows,{$ENDIF} Classes, {$IFDEF FPC}dynlibs,{$ENDIF}SysUtils,
{$ENDIF}
uCEFInterfaces, uCEFTypes;
// REFERENCES :
// ============
// https://tools.ietf.org/html/rfc6749
// https://tools.ietf.org/html/rfc6750
// https://tools.ietf.org/html/rfc8252
// https://tools.ietf.org/html/rfc6819
// https://tools.ietf.org/html/rfc7636
// https://tools.ietf.org/html/draft-ietf-oauth-native-apps-12
// https://tools.ietf.org/html/draft-ietf-oauth-security-topics-13
// https://developers.google.com/identity/protocols/OAuth2
// https://developers.google.com/identity/protocols/OAuth2InstalledApp
// https://developers.google.com/identity/protocols/googlescopes
// https://developers.google.com/identity/protocols/OpenIDConnect
// https://aaronparecki.com/oauth-2-simplified/
// https://example-app.com/pkce
const
DEFAULT_REDIRECT_IPV4_HOST = '127.0.0.1';
DEFAULT_REDIRECT_IPV6_HOST = '[::1]';
DEFAULT_REDIRECT_PORT = 50000;
GOOGLE_DISCOVERY_DOCUMENT = 'https://accounts.google.com/.well-known/openid-configuration';
type
TOAuthChallengeMethod = (cmPlain, cmSHA256);
TCEFOAuth2Helper = class
protected
FRedirectHost : ustring;
FRedirectPort : integer;
FAuthEndpoint : ustring;
FTokenEndpoint : ustring;
FClientID : ustring;
FClientSecret : ustring;
FAuthCode : ustring;
FError : ustring;
FErrorDescription : ustring;
FCodeVerifier : ustring;
FCodeChallenge : ustring;
FScope : ustring;
FAccessToken : ustring;
FIDToken : ustring;
FState : ustring;
FIncState : ustring;
FRefreshToken : ustring;
FTokenExpiry : integer;
FTokenType : ustring;
FLoginHint : ustring;
FChallengeMethod : TOAuthChallengeMethod;
function GetRedirectURI : ustring; virtual;
function GetAuthCodeURI : ustring; virtual;
function GetRefreshParams : ustring; virtual;
function GetTokeExchangeParams : ustring; virtual;
function GetValidState : boolean; virtual;
procedure GenerateRandomCodeChallenge; virtual;
procedure GenerateRandomState; virtual;
function GenerateRandomString(aLength : cardinal) : ustring;
procedure ParseQueryPair(const aPair : ustring);
function ReadJSONString(const aDictionary : ICefDictionaryValue; const aKey : ustring) : ustring;
function ReadJSONInteger(const aDictionary : ICefDictionaryValue; const aKey : ustring) : integer;
function CalculateSHA256Hash(const aString : ustring) : TCefCustomByteArray;
public
constructor Create;
procedure Initialize; virtual;
function ParseTokenExchangeResponse(const aResponse : ustring) : boolean; virtual;
function ParseRefreshTokenResponse(const aResponse : ustring) : boolean; virtual;
function ParseCodeRequestResponse(const aURL : ustring) : boolean; virtual;
property AuthEndpoint : ustring read FAuthEndpoint write FAuthEndpoint;
property TokenEndpoint : ustring read FTokenEndpoint write FTokenEndpoint;
property ClientID : ustring read FClientID write FClientID;
property ClientSecret : ustring read FClientSecret write FClientSecret;
property RedirectHost : ustring read FRedirectHost write FRedirectHost;
property RedirectPort : integer read FRedirectPort write FRedirectPort;
property ChallengeMethod : TOAuthChallengeMethod read FChallengeMethod write FChallengeMethod;
property Scope : ustring read FScope write FScope;
property Error : ustring read FError;
property ErrorDescription : ustring read FErrorDescription;
property AccessToken : ustring read FAccessToken;
property IDToken : ustring read FIDToken;
property RefreshToken : ustring read FRefreshToken;
property TokenExpiry : integer read FTokenExpiry;
property TokenType : ustring read FTokenType;
property CodeVerifier : ustring read FCodeVerifier;
property CodeChallenge : ustring read FCodeChallenge;
property RedirectURI : ustring read GetRedirectURI;
property AuthCodeURI : ustring read GetAuthCodeURI;
property TokeExchangeParams : ustring read GetTokeExchangeParams;
property RefreshParams : ustring read GetRefreshParams;
property ValidState : boolean read GetValidState;
end;
implementation
uses
{$IFDEF DELPHI22_UP}System.Hash,{$ENDIF}
{$IFDEF FPC}DCPSha256,{$ENDIF}
uCEFMiscFunctions, uCEFJson;
constructor TCEFOAuth2Helper.Create;
begin
inherited Create;
Initialize;
end;
procedure TCEFOAuth2Helper.Initialize;
begin
FRedirectHost := DEFAULT_REDIRECT_IPV4_HOST;
FRedirectPort := DEFAULT_REDIRECT_PORT; // This should be a random unused port
FAuthEndpoint := 'https://accounts.google.com/o/oauth2/v2/auth'; // obtained from GOOGLE_DISCOVERY_DOCUMENT
FTokenEndpoint := 'https://oauth2.googleapis.com/token'; // obtained from GOOGLE_DISCOVERY_DOCUMENT
FClientID := '';
FClientSecret := '';
FAuthCode := '';
FError := '';
FErrorDescription := '';
FCodeVerifier := '';
FCodeChallenge := '';
FScope := 'openid';
FAccessToken := '';
FIDToken := '';
FState := '';
FIncState := '';
FRefreshToken := '';
FTokenExpiry := 0;
FTokenType := '';
FLoginHint := '';
FChallengeMethod := cmPlain;
end;
function TCEFOAuth2Helper.GetRedirectURI : ustring;
begin
Result := 'http://' + FRedirectHost + ':' + inttostr(FRedirectPort);
end;
function TCEFOAuth2Helper.GetAuthCodeURI : ustring;
begin
GenerateRandomCodeChallenge;
GenerateRandomState;
Result := FAuthEndpoint +
'?response_type=code' +
'&client_id=' + CefUriEncode(FClientID, True) +
'&redirect_uri=' + CefUriEncode(RedirectURI, True) +
'&scope=' + CefUriEncode(FScope, True) +
'&state=' + FState +
'&code_challenge=' + CefUriEncode(FCodeChallenge, True);
if (ChallengeMethod = cmPlain) then
Result := Result + '&code_challenge_method=plain'
else
Result := Result + '&code_challenge_method=S256';
if (length(FLoginHint) > 0) then
Result := Result + '&login_hint=' + CefUriEncode(FLoginHint, True);
end;
function TCEFOAuth2Helper.GetTokeExchangeParams : ustring;
begin
Result := 'grant_type=authorization_code' +
'&code=' + FAuthCode +
'&client_id=' + CefUriEncode(FClientID, True) +
'&client_secret=' + CefUriEncode(FClientSecret, True) +
'&redirect_uri=' + CefUriEncode(RedirectURI, True) +
'&code_verifier=' + CefUriEncode(FCodeVerifier, True);
end;
function TCEFOAuth2Helper.GetRefreshParams : ustring;
begin
Result := 'grant_type=refresh_token' +
'&client_id=' + CefUriEncode(FClientID, True) +
'&client_secret=' + CefUriEncode(FClientSecret, True) +
'&refresh_token=' + CefUriEncode(FRefreshToken, True);
end;
function TCEFOAuth2Helper.GetValidState : boolean;
begin
Result := (CompareStr(FState, FIncState) = 0);
end;
function TCEFOAuth2Helper.GenerateRandomString(aLength : cardinal) : ustring;
const
UnreservedCharValuesLen = 66;
UnreservedCharValues : array [0..pred(UnreservedCharValuesLen)] of
char = ('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'-', '.', '_', '~');
var
i : cardinal;
begin
Result := '';
i := 0;
Randomize;
while (i < aLength) do
begin
Result := Result + UnreservedCharValues[Random(UnreservedCharValuesLen)];
inc(i);
end;
end;
procedure TCEFOAuth2Helper.GenerateRandomCodeChallenge;
var
TempHash : TCefCustomByteArray;
begin
// The "code_verifier" can have a minimum length of 43 characters
// and a maximum length of 128 characters.
FCodeVerifier := GenerateRandomString(64);
case ChallengeMethod of
cmPlain : FCodeChallenge := FCodeVerifier;
cmSHA256 :
try
TempHash := CalculateSHA256Hash(FCodeVerifier);
if (length(TempHash) > 0) then
begin
FCodeChallenge := CefBase64Encode(@TempHash[0], length(TempHash));
// Converts base64 to base64url.
FCodeChallenge := StringReplace(FCodeChallenge, '+', '-', [rfReplaceAll]);
FCodeChallenge := StringReplace(FCodeChallenge, '/', '_', [rfReplaceAll]);
// Strips padding.
while (length(FCodeChallenge) > 0) and (FCodeChallenge[length(FCodeChallenge)] = '=') do
FCodeChallenge := copy(FCodeChallenge, 1, pred(length(FCodeChallenge)));
end
else
FCodeChallenge := '';
finally
if (TempHash <> nil) then
begin
Finalize(TempHash);
TempHash := nil;
end;
end;
end;
end;
{$IFDEF FPC}
function TCEFOAuth2Helper.CalculateSHA256Hash(const aString : ustring) : TCefCustomByteArray;
var
TempSHA256 : TDCP_sha256;
TempString : AnsiString;
begin
Result := nil;
try
TempSHA256 := TDCP_sha256.Create(nil);
TempSHA256.Burn;
TempSHA256.Init;
TempString := AnsiString(aString);
TempSHA256.Update(TempString[1], length(TempString));
SetLength(Result, 32);
TempSHA256.Final(Result[0]);
finally
FreeAndNil(TempSHA256);
end;
end;
{$ELSE}
{$IFDEF DELPHI22_UP}
function TCEFOAuth2Helper.CalculateSHA256Hash(const aString : ustring) : TCefCustomByteArray;
var
TempBytes : TBytes;
begin
TempBytes := THashSHA2.GetHashBytes(FCodeVerifier);
SetLength(Result, length(TempBytes));
Move(TempBytes[0], Result[0], length(TempBytes));
end;
{$ELSE}
// TO-DO: Calculate SHA256 hash in older Delphi versions
function TCEFOAuth2Helper.CalculateSHA256Hash(const aString : ustring) : TCefCustomByteArray;
begin
Result := nil;
end;
{$ENDIF}
{$ENDIF}
procedure TCEFOAuth2Helper.GenerateRandomState;
begin
// The "state" should be a string of 30 or so characters constructed
// using a high-quality random-number generator.
Randomize;
FState := IntToHex(Random(high(integer)), 8) +
IntToHex(Random(high(integer)), 8) +
IntToHex(Random(high(integer)), 8) +
IntToHex(Random(high(integer)), 8);
end;
function TCEFOAuth2Helper.ReadJSONString(const aDictionary : ICefDictionaryValue; const aKey : ustring) : ustring;
var
TempValue : ICefValue;
begin
Result := '';
if (aDictionary <> nil) then
begin
TempValue := aDictionary.GetValue(aKey);
if (TempValue <> nil) and (TempValue.GetType = VTYPE_STRING) then Result := TempValue.GetString;
end;
end;
function TCEFOAuth2Helper.ReadJSONInteger(const aDictionary : ICefDictionaryValue; const aKey : ustring) : integer;
var
TempValue : ICefValue;
begin
Result := 0;
if (aDictionary <> nil) then
begin
TempValue := aDictionary.GetValue(aKey);
if (TempValue <> nil) and (TempValue.GetType = VTYPE_INT) then Result := TempValue.GetInt;
end;
end;
function TCEFOAuth2Helper.ParseTokenExchangeResponse(const aResponse : ustring) : boolean;
var
TempRoot : ICefValue;
TempDictionary : ICefDictionaryValue;
begin
Result := False;
try
if (length(aResponse) > 0) then
begin
TempRoot := TCEFJson.Parse(aResponse);
if (TempRoot <> nil) and (TempRoot.GetType = VTYPE_DICTIONARY) then
begin
TempDictionary := TempRoot.GetDictionary;
FError := ReadJSONString(TempDictionary, 'error');
if (length(FError) > 0) then
FErrorDescription := ReadJSONString(TempDictionary, 'error_description')
else
begin
FAccessToken := ReadJSONString(TempDictionary, 'access_token');
if (length(FAccessToken) > 0) then
begin
FIDToken := ReadJSONString(TempDictionary, 'id_token');
FScope := ReadJSONString(TempDictionary, 'scope');
FTokenType := ReadJSONString(TempDictionary, 'token_type');
FRefreshToken := ReadJSONString(TempDictionary, 'refresh_token');
FTokenExpiry := ReadJSONInteger(TempDictionary, 'expires_in');
Result := True;
end;
end;
end;
end;
except
on e : exception do
if CustomExceptionHandler('TCEFOAuth2Helper.ParseTokenExchangeResponse', e) then raise;
end;
end;
function TCEFOAuth2Helper.ParseRefreshTokenResponse(const aResponse : ustring) : boolean;
var
TempRoot : ICefValue;
TempDictionary : ICefDictionaryValue;
begin
Result := False;
try
if (length(aResponse) > 0) then
begin
TempRoot := TCEFJson.Parse(aResponse);
if (TempRoot <> nil) and (TempRoot.GetType = VTYPE_DICTIONARY) then
begin
TempDictionary := TempRoot.GetDictionary;
FError := ReadJSONString(TempDictionary, 'error');
if (length(FError) > 0) then
FErrorDescription := ReadJSONString(TempDictionary, 'error_description')
else
begin
FAccessToken := ReadJSONString(TempDictionary, 'access_token');
if (length(FAccessToken) > 0) then
begin
FTokenType := ReadJSONString(TempDictionary, 'token_type');
FTokenExpiry := ReadJSONInteger(TempDictionary, 'expires_in');
Result := True;
end;
end;
end;
end;
except
on e : exception do
if CustomExceptionHandler('TCEFOAuth2Helper.ParseRefreshTokenResponse', e) then raise;
end;
end;
procedure TCEFOAuth2Helper.ParseQueryPair(const aPair : ustring);
var
TempKey : ustring;
TempValue : ustring;
i : integer;
begin
i := pos('=', aPair);
if (i > 0) then
begin
TempKey := copy(aPair, 1, pred(i));
TempValue := copy(aPair, succ(i), length(aPair));
if (CompareStr(TempKey, 'code') = 0) then FAuthCode := TempValue
else if (CompareStr(TempKey, 'state') = 0) then FIncState := TempValue
else if (CompareStr(TempKey, 'error') = 0) then FError := TempValue
else if (CompareStr(TempKey, 'error_description') = 0) then FErrorDescription := TempValue;
end;
end;
function TCEFOAuth2Helper.ParseCodeRequestResponse(const aURL : ustring) : boolean;
var
TempParts : TUrlParts;
TempQuery : ustring;
i : integer;
begin
Result := False;
if (length(aURL) > 0) then
begin
CefParseUrl(aURL, TempParts);
TempQuery := TempParts.query;
if (length(TempQuery) > 0) then
begin
i := pos('&', TempQuery);
while (i > 0) do
begin
ParseQueryPair(copy(TempQuery, 1, pred(i)));
TempQuery := copy(TempQuery, succ(i), length(TempQuery));
i := pos('&', TempQuery);
end;
ParseQueryPair(TempQuery);
Result := ValidState and (length(FAuthCode) > 0);
end;
end;
end;
end.
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