aksdb
/
restemplate
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
restemplate/indy/Protocols/IdMessageCoderMIME.pas

782 lines
28 KiB
Plaintext
Raw Permalink Blame History

{
$Project$
$Workfile$
$Revision$
$DateUTC$
$Id$
This file is part of the Indy (Internet Direct) project, and is offered
under the dual-licensing agreement described on the Indy website.
(http://www.indyproject.org/)
Copyright:
(c) 1993-2005, Chad Z. Hower and the Indy Pit Crew. All rights reserved.
}
{
$Log$
}
{
Rev 1.37 26/03/2005 19:20:10 CCostelloe
Fixes for "uneven size" exception
Rev 1.36 27.08.2004 22:03:58 Andreas Hausladen
speed optimization ("const" for string parameters)
Rev 1.35 8/15/04 5:41:00 PM RLebeau
Updated GetAttachmentFilename() to handle cases where Outlook puts spaces
between "name=" and the filename.
Updated CheckAndSetType() to retreive the filename before checking the type.
This helps to detect all file attachments better, including "form-data"
attachments
Rev 1.34 8/11/04 1:32:52 AM RLebeau
Bug fix for TIdMessageDecoderMIME.GetAttachmentFilename()
Rev 1.33 8/10/04 1:41:48 PM RLebeau
Misc. tweaks
Rev 1.32 6/11/2004 9:38:22 AM DSiders
Added "Do not Localize" comments.
Rev 1.31 6/4/04 12:41:04 PM RLebeau
ContentTransferEncoding bug fix
Rev 1.30 29/05/2004 21:23:56 CCostelloe
Added support for decoding attachments with a Content-Transfer-Encoding of
binary
Rev 1.29 2004.05.20 1:39:12 PM czhower
Last of the IdStream updates
Rev 1.28 2004.05.20 11:36:56 AM czhower
IdStreamVCL
Rev 1.27 2004.05.20 11:13:00 AM czhower
More IdStream conversions
Rev 1.26 2004.05.19 3:06:40 PM czhower
IdStream / .NET fix
Rev 1.25 16/05/2004 18:55:26 CCostelloe
New TIdText/TIdAttachment processing
Rev 1.24 23/04/2004 20:50:24 CCostelloe
Paths removed from attachment filenames and invalid Windows filename chars
weeded out
Rev 1.23 04/04/2004 17:44:56 CCostelloe
Bug fix
Rev 1.22 03/04/2004 20:27:22 CCostelloe
Fixed bug where code assumed Content-Type always contained a filename for the
attachment.
Rev 1.21 2004.02.03 5:44:04 PM czhower
Name changes
Rev 1.20 1/31/2004 3:12:48 AM JPMugaas
Removed dependancy on Math unit. It isn't needed and is problematic in some
versions of Dlephi which don't include it.
Rev 1.19 1/22/2004 4:02:52 PM SPerry
fixed set problems
Rev 1.18 16/01/2004 17:42:56 CCostelloe
Added support for BinHex 4.0 encoding
Rev 1.17 5/12/2003 9:18:26 AM GGrieve
use WriteStringToStream
Rev 1.16 5/12/2003 12:31:16 AM GGrieve
Fis WriteBuffer - can't be used in DotNet
Rev 1.15 10/17/2003 12:40:20 AM DSiders
Added localization comments.
Rev 1.14 05/10/2003 16:41:54 CCostelloe
Restructured MIME boundary outputting
Rev 1.13 29/09/2003 13:07:48 CCostelloe
Second RandomRange replaced with Random
Rev 1.12 28/09/2003 22:56:30 CCostelloe
TIdMessageEncoderInfoMIME.InitializeHeaders now only sets ContentType if it
is ''
Rev 1.11 28/09/2003 21:06:52 CCostelloe
Recoded RandomRange to Random to suit D% and BCB5
Rev 1.10 26/09/2003 01:05:42 CCostelloe
Removed FIndyMultiPartAlternativeBoundary, IFndyMultiPartRelatedBoundary - no
longer needed. Added support for ContentTransferEncoding '8bit'. Changed
nested MIME decoding from finding boundary to finding 'multipart/'.
Rev 1.9 04/09/2003 20:46:38 CCostelloe
Added inclusion of =_ in boundary generation in
TIdMIMEBoundaryStrings.GenerateStrings
Rev 1.8 30/08/2003 18:39:58 CCostelloe
MIME boundaries changed to be random strings
Rev 1.7 07/08/2003 00:56:48 CCostelloe
ReadBody altered to allow lines over 16K (arises with long html parts)
Rev 1.6 2003.06.14 11:08:10 PM czhower
AV fix
Rev 1.5 6/14/2003 02:46:42 PM JPMugaas
Kudzu wanted the BeginDecode called after LDecoder was created and EndDecode
to be called just before LDecoder was destroyed.
Rev 1.4 6/14/2003 1:14:12 PM BGooijen
fix for the bug where the attachments are empty
Rev 1.3 6/13/2003 07:58:46 AM JPMugaas
Should now compile with new decoder design.
Rev 1.2 5/23/03 11:24:06 AM RLebeau
Fixed a compiler error for previous changes
Rev 1.1 5/23/03 9:51:18 AM RLebeau
Fixed bug where message body is parsed incorrectly when MIMEBoundary is empty.
Rev 1.0 11/13/2002 07:57:08 AM JPMugaas
2003-Oct-04 Ciaran Costelloe
Moved boundary out of InitializeHeaders into TIdMessage.GenerateHeader
}
unit IdMessageCoderMIME;
// for all 3 to 4s:
// TODO: Predict output sizes and presize outputs, then use move on
// presized outputs when possible, or presize only and reposition if stream
interface
{$i IdCompilerDefines.inc}
uses
Classes,
IdBaseComponent,
IdMessageCoder,
IdMessage,
IdGlobal;
type
TIdMessageDecoderMIME = class(TIdMessageDecoder)
protected
FFirstLine: string;
FProcessFirstLine: Boolean;
FBodyEncoded: Boolean;
FMIMEBoundary: string;
function GetProperHeaderItem(const Line: string): string;
procedure InitComponent; override;
public
constructor Create(AOwner: TComponent; const ALine: string); reintroduce; overload;
function ReadBody(ADestStream: TStream; var VMsgEnd: Boolean): TIdMessageDecoder; override;
procedure CheckAndSetType(const AContentType, AContentDisposition: string);
procedure ReadHeader; override;
function GetAttachmentFilename(const AContentType, AContentDisposition: string): string;
function RemoveInvalidCharsFromFilename(const AFilename: string): string;
//
property MIMEBoundary: string read FMIMEBoundary write FMIMEBoundary;
property BodyEncoded: Boolean read FBodyEncoded write FBodyEncoded;
end;
TIdMessageDecoderInfoMIME = class(TIdMessageDecoderInfo)
public
function CheckForStart(ASender: TIdMessage; const ALine: string): TIdMessageDecoder; override;
end;
TIdMessageEncoderMIME = class(TIdMessageEncoder)
public
procedure Encode(ASrc: TStream; ADest: TStream); override;
end;
TIdMessageEncoderInfoMIME = class(TIdMessageEncoderInfo)
public
constructor Create; override;
procedure InitializeHeaders(AMsg: TIdMessage); override;
end;
TIdMIMEBoundaryStrings = class
public
class function GenerateRandomChar: Char;
class function GenerateBoundary: String;
end;
implementation
uses
IdCoder, IdCoderMIME, IdException, IdGlobalProtocols, IdResourceStrings,
IdCoderQuotedPrintable, IdCoderBinHex4, IdCoderHeader, SysUtils;
type
{
RLebeau: TIdMessageDecoderMIMEIgnore is a private class used when
TIdMessageDecoderInfoMIME.CheckForStart() detects an ending MIME boundary
for a finished message part that has nested parts in it. This is a dirty
hack to allow TIdMessageClient to skip the boundary line properly, or else
the line ends up as spare data in the TIdMessage.Body property, which is
not desired. A better solution to signal TIdMessageClient to ignore the
line needs to be found later.
}
TIdMessageDecoderMIMEIgnore = class(TIdMessageDecoder)
public
function ReadBody(ADestStream: TStream; var VMsgEnd: Boolean): TIdMessageDecoder; override;
procedure ReadHeader; override;
end;
function TIdMessageDecoderMIMEIgnore.ReadBody(ADestStream: TStream; var VMsgEnd: Boolean): TIdMessageDecoder;
begin
VMsgEnd := False;
Result := nil;
end;
procedure TIdMessageDecoderMIMEIgnore.ReadHeader;
begin
FPartType := mcptIgnore;
end;
{ TIdMIMEBoundaryStrings }
class function TIdMIMEBoundaryStrings.GenerateRandomChar: Char;
var
LOrd: integer;
LFloat: Double;
begin
if RandSeed = 0 then begin
Randomize;
end;
{Allow only digits (ASCII 48-57), upper-case letters (65-90) and lowercase
letters (97-122), which is 62 possible chars...}
LFloat := (Random * 61) + 1.5; //Gives us 1.5 to 62.5
LOrd := Trunc(LFloat) + 47; //(1..62) -> (48..109)
if LOrd > 83 then begin
LOrd := LOrd + 13; {Move into lowercase letter range}
end else if LOrd > 57 then begin
Inc(LOrd, 7); {Move into upper-case letter range}
end;
Result := Chr(LOrd);
end;
{This generates a random MIME boundary.}
class function TIdMIMEBoundaryStrings.GenerateBoundary: String;
const
{Generate a string 34 characters long (34 is a whim, not a requirement)...}
BoundaryLength = 34;
var
LN: Integer;
LFloat: Double;
{$IFDEF STRING_IS_IMMUTABLE}
LSB: TIdStringBuilder;
{$ENDIF}
begin
{$IFDEF STRING_IS_IMMUTABLE}
LSB := TIdStringBuilder.Create(BoundaryLength);
{$ELSE}
Result := StringOfChar(' ', BoundaryLength);
{$ENDIF}
for LN := 1 to BoundaryLength do begin
{$IFDEF STRING_IS_IMMUTABLE}
LSB.Append(GenerateRandomChar);
{$ELSE}
Result[LN] := GenerateRandomChar;
{$ENDIF}
end;
{CC2: RFC 2045 recommends including "=_" in the boundary, insert in random location...}
LFloat := (Random * (BoundaryLength-2)) + 1.5; //Gives us 1.5 to Length-0.5
LN := Trunc(LFloat); // 1 to Length-1 (we are inserting a 2-char string)
{$IFDEF STRING_IS_IMMUTABLE}
LSB[LN-1] := '=';
LSB[LN] := '_';
Result := LSB.ToString;
{$ELSE}
Result[LN] := '=';
Result[LN+1] := '_';
{$ENDIF}
end;
{ TIdMessageDecoderInfoMIME }
function TIdMessageDecoderInfoMIME.CheckForStart(ASender: TIdMessage;
const ALine: string): TIdMessageDecoder;
begin
Result := nil;
if ASender.MIMEBoundary.Boundary <> '' then begin
if TextIsSame(ALine, '--' + ASender.MIMEBoundary.Boundary) then begin {Do not Localize}
Result := TIdMessageDecoderMIME.Create(ASender);
end
else if TextIsSame(ALine, '--' + ASender.MIMEBoundary.Boundary + '--') then begin {Do not Localize}
ASender.MIMEBoundary.Pop;
Result := TIdMessageDecoderMIMEIgnore.Create(ASender);
end;
end;
if (Result = nil) and (ASender.ContentTransferEncoding <> '') then begin
if IsHeaderMediaType(ASender.ContentType, 'multipart') and {do not localize}
(PosInStrArray(ASender.ContentTransferEncoding, ['7bit', '8bit', 'binary'], False) = -1) then {do not localize}
begin
Exit;
end;
if (PosInStrArray(ASender.ContentTransferEncoding, ['base64', 'quoted-printable'], False) <> -1) then begin {Do not localize}
Result := TIdMessageDecoderMIME.Create(ASender, ALine);
end;
end;
end;
{ TIdMessageDecoderMIME }
constructor TIdMessageDecoderMIME.Create(AOwner: TComponent; const ALine: string);
begin
inherited Create(AOwner);
FFirstLine := ALine;
FProcessFirstLine := True;
end;
function TIdMessageDecoderMIME.ReadBody(ADestStream: TStream; var VMsgEnd: Boolean): TIdMessageDecoder;
var
LContentType, LContentTransferEncoding: string;
LDecoder: TIdDecoder;
LLine: string;
LBinaryLineBreak: string;
LBuffer: string; //Needed for binhex4 because cannot decode line-by-line.
LIsThisTheFirstLine: Boolean; //Needed for binary encoding
LBoundaryStart, LBoundaryEnd: string;
LIsBinaryContentTransferEncoding: Boolean;
LEncoding: IIdTextEncoding;
begin
LIsThisTheFirstLine := True;
VMsgEnd := False;
Result := nil;
if FBodyEncoded then begin
LContentType := TIdMessage(Owner).ContentType;
LContentTransferEncoding := TIdMessage(Owner).ContentTransferEncoding;
end else begin
LContentType := FHeaders.Values['Content-Type']; {Do not Localize}
LContentTransferEncoding := FHeaders.Values['Content-Transfer-Encoding']; {Do not Localize}
end;
if LContentTransferEncoding = '' then begin
// RLebeau 04/08/2014: According to RFC 2045 Section 6.1:
// "Content-Transfer-Encoding: 7BIT" is assumed if the
// Content-Transfer-Encoding header field is not present."
if IsHeaderMediaType(LContentType, 'application/mac-binhex40') then begin {Do not Localize}
LContentTransferEncoding := 'binhex40'; {do not localize}
end
else if not IsHeaderMediaType(LContentType, 'application/octet-stream') then begin {Do not Localize}
LContentTransferEncoding := '7bit'; {do not localize}
end;
end
else if IsHeaderMediaType(LContentType, 'multipart') then {do not localize}
begin
// RLebeau 08/17/09 - According to RFC 2045 Section 6.4:
// "If an entity is of type "multipart" the Content-Transfer-Encoding is not
// permitted to have any value other than "7bit", "8bit" or "binary"."
//
// However, came across one message where the "Content-Type" was set to
// "multipart/related" and the "Content-Transfer-Encoding" was set to
// "quoted-printable". Outlook and Thunderbird were apparently able to parse
// the message correctly, but Indy was not. So let's check for that scenario
// and ignore illegal "Content-Transfer-Encoding" values if present...
if PosInStrArray(LContentTransferEncoding, ['7bit', '8bit', 'binary'], False) = -1 then begin {do not localize}
LContentTransferEncoding := '';
end;
end;
if TextIsSame(LContentTransferEncoding, 'base64') then begin {Do not Localize}
LDecoder := TIdDecoderMIMELineByLine.Create(nil);
end else if TextIsSame(LContentTransferEncoding, 'quoted-printable') then begin {Do not Localize}
LDecoder := TIdDecoderQuotedPrintable.Create(nil);
end else if TextIsSame(LContentTransferEncoding, 'binhex40') then begin {Do not Localize}
LDecoder := TIdDecoderBinHex4.Create(nil);
end else begin
LDecoder := nil;
end;
try
if LDecoder <> nil then begin
LDecoder.DecodeBegin(ADestStream);
end;
if MIMEBoundary <> '' then begin
LBoundaryStart := '--' + MIMEBoundary; {Do not Localize}
LBoundaryEnd := LBoundaryStart + '--'; {Do not Localize}
end;
if LContentTransferEncoding <> '' then begin
case PosInStrArray(LContentTransferEncoding, ['7bit', 'quoted-printable', 'base64', '8bit', 'binary'], False) of {do not localize}
0..2: LIsBinaryContentTransferEncoding := False;
3..4: LIsBinaryContentTransferEncoding := True;
else
// According to RFC 2045 Section 6.4:
// "Any entity with an unrecognized Content-Transfer-Encoding must be
// treated as if it has a Content-Type of "application/octet-stream",
// regardless of what the Content-Type header field actually says."
LIsBinaryContentTransferEncoding := True;
LContentTransferEncoding := '';
end;
end else begin
LIsBinaryContentTransferEncoding := True;
end;
repeat
if not FProcessFirstLine then begin
EnsureEncoding(LEncoding, enc8Bit);
if LIsBinaryContentTransferEncoding then begin
// For binary, need EOL because the default LF causes spurious CRs in the output...
// TODO: don't use ReadLnRFC() for binary data at all. Read into an intermediate
// buffer instead, looking for the next MIME boundary and message terminator while
// flushing the buffer to the destination stream along the way. Otherwise, at the
// very least, we need to detect the type of line break used (CRLF vs bare-LF) so
// we can duplicate it correctly in the output. Most systems use CRLF, per the RFCs,
// but have seen systems use bare-LF instead...
LLine := ReadLnRFC(VMsgEnd, EOL, '.', LEncoding{$IFDEF STRING_IS_ANSI}, LEncoding{$ENDIF}); {do not localize}
LBinaryLineBreak := EOL; // TODO: detect the actual line break used
end else begin
LLine := ReadLnRFC(VMsgEnd, LF, '.', LEncoding{$IFDEF STRING_IS_ANSI}, LEncoding{$ENDIF}); {do not localize}
end;
end else begin
LLine := FFirstLine;
FFirstLine := ''; {Do not Localize}
FProcessFirstLine := False;
// Do not use ADELIM since always ends with . (standard)
if LLine = '.' then begin {Do not Localize}
VMsgEnd := True;
Break;
end;
if TextStartsWith(LLine, '..') then begin
Delete(LLine, 1, 1);
end;
end;
if VMsgEnd then begin
Break;
end;
// New boundary - end self and create new coder
if MIMEBoundary <> '' then begin
if TextIsSame(LLine, LBoundaryStart) then begin
Result := TIdMessageDecoderMIME.Create(Owner);
Break;
// End of all coders (not quite ALL coders)
end;
if TextIsSame(LLine, LBoundaryEnd) then begin
// POP the boundary
if Owner is TIdMessage then begin
TIdMessage(Owner).MIMEBoundary.Pop;
end;
Break;
end;
end;
if LDecoder = nil then begin
// Data to save, but not decode
if Assigned(ADestStream) then begin
EnsureEncoding(LEncoding, enc8Bit);
end;
if LIsBinaryContentTransferEncoding then begin {do not localize}
//In this case, we have to make sure we dont write out an EOL at the
//end of the file.
if LIsThisTheFirstLine then begin
LIsThisTheFirstLine := False;
end else begin
if Assigned(ADestStream) then begin
WriteStringToStream(ADestStream, LBinaryLineBreak, LEncoding{$IFDEF STRING_IS_ANSI}, LEncoding{$ENDIF});
end;
end;
if Assigned(ADestStream) then begin
WriteStringToStream(ADestStream, LLine, LEncoding{$IFDEF STRING_IS_ANSI}, LEncoding{$ENDIF});
end;
end else begin
if Assigned(ADestStream) then begin
WriteStringToStream(ADestStream, LLine + EOL, LEncoding{$IFDEF STRING_IS_ANSI}, LEncoding{$ENDIF});
end;
end;
end
else begin
// Data to decode
if LDecoder is TIdDecoderQuotedPrintable then begin
// For TIdDecoderQuotedPrintable, we have to make sure all EOLs are intact
LDecoder.Decode(LLine + EOL);
end else if LDecoder is TIdDecoderBinHex4 then begin
// We cannot decode line-by-line because lines don't have a whole
// number of 4-byte blocks due to the : inserted at the start of
// the first line, so buffer the file...
// TODO: flush the buffer periodically when it has enough blocks
// in it, otherwise we are buffering the entire file in memory
// before decoding it...
LBuffer := LBuffer + LLine;
end else if LLine <> '' then begin
LDecoder.Decode(LLine);
end;
end;
until False;
if LDecoder <> nil then begin
if LDecoder is TIdDecoderBinHex4 then begin
//Now decode the complete block...
LDecoder.Decode(LBuffer);
end;
LDecoder.DecodeEnd;
end;
finally
FreeAndNil(LDecoder);
end;
end;
function TIdMessageDecoderMIME.GetAttachmentFilename(const AContentType, AContentDisposition: string): string;
var
LValue: string;
begin
LValue := ExtractHeaderSubItem(AContentDisposition, 'filename', QuoteMIME); {do not localize}
if LValue = '' then begin
// Get filename from Content-Type
LValue := ExtractHeaderSubItem(AContentType, 'name', QuoteMIME); {do not localize}
end;
if Length(LValue) > 0 then begin
Result := RemoveInvalidCharsFromFilename(DecodeHeader(LValue));
end else begin
Result := '';
end;
end;
procedure TIdMessageDecoderMIME.CheckAndSetType(const AContentType, AContentDisposition: string);
begin
{The new world order: Indy now defines a TIdAttachment as a part that either has
a filename, or else does NOT have a ContentType starting with text/ or multipart/.
Anything left is a TIdText.}
{RLebeau 3/28/2006: RFC 2183 states that inlined text can have
filenames as well, so do NOT treat inlined text as attachments!}
//WARNING: Attachments may not necessarily have filenames, and Text parts may have filenames!
FFileName := GetAttachmentFilename(AContentType, AContentDisposition);
{see what type the part is...}
if IsHeaderMediaTypes(AContentType, ['text', 'multipart']) and {do not localize}
(not IsHeaderValue(AContentDisposition, 'attachment')) then {do not localize}
begin
// TODO: According to RFC 2045 Section 6.4:
// "Any entity with an unrecognized Content-Transfer-Encoding must be
// treated as if it has a Content-Type of "application/octet-stream",
// regardless of what the Content-Type header field actually says."
FPartType := mcptText;
end else begin
FPartType := mcptAttachment;
end;
end;
function TIdMessageDecoderMIME.GetProperHeaderItem(const Line: string): string;
var
LPos, Idx, LLen: Integer;
begin
LPos := Pos(':', Line);
if LPos = 0 then begin // the header line is invalid
Result := Line;
Exit;
end;
Idx := LPos - 1;
while (Idx > 0) and (Line[Idx] = ' ') do begin
Dec(Idx);
end;
LLen := Length(Line);
Inc(LPos);
while (LPos <= LLen) and (Line[LPos] = ' ') do begin
Inc(LPos);
end;
Result := Copy(Line, 1, Idx) + '=' + Copy(Line, LPos, MaxInt);
end;
procedure TIdMessageDecoderMIME.ReadHeader;
var
ABoundary,
s: string;
LLine: string;
LMsgEnd: Boolean;
begin
if FBodyEncoded then begin // Read header from the actual message since body parts don't exist {Do not Localize}
CheckAndSetType(TIdMessage(Owner).ContentType, TIdMessage(Owner).ContentDisposition);
end else begin
// Read header
repeat
LLine := ReadLnRFC(LMsgEnd);
if LMsgEnd then begin // TODO: abnormal situation (Masters!) {Do not Localize}
FPartType := mcptEOF;
Exit;
end;//if
if LLine = '' then begin
Break;
end;
if CharIsInSet(LLine, 1, LWS) then begin
if FHeaders.Count > 0 then begin
FHeaders[FHeaders.Count - 1] := FHeaders[FHeaders.Count - 1] + ' ' + TrimLeft(LLine); {Do not Localize}
end else begin
//Make sure you change 'Content-Type :' to 'Content-Type:'
FHeaders.Add(GetProperHeaderItem(TrimLeft(LLine))); {Do not Localize}
end;
end else begin
//Make sure you change 'Content-Type :' to 'Content-Type:'
FHeaders.Add(GetProperHeaderItem(LLine)); {Do not Localize}
end;
until False;
s := FHeaders.Values['Content-Type']; {do not localize}
//CC: Need to detect on "multipart" rather than boundary, because only the
//"multipart" bit will be visible later...
if IsHeaderMediaType(s, 'multipart') then begin {do not localize}
ABoundary := ExtractHeaderSubItem(s, 'boundary', QuoteMIME); {do not localize}
if Owner is TIdMessage then begin
if Length(ABoundary) > 0 then begin
TIdMessage(Owner).MIMEBoundary.Push(ABoundary, TIdMessage(Owner).MessageParts.Count);
// Also update current boundary
FMIMEBoundary := ABoundary;
end else begin
//CC: We are in trouble. A multipart MIME Content-Type with no boundary?
//Try pushing the current boundary...
TIdMessage(Owner).MIMEBoundary.Push(FMIMEBoundary, TIdMessage(Owner).MessageParts.Count);
end;
end;
end;
CheckAndSetType(FHeaders.Values['Content-Type'], {do not localize}
FHeaders.Values['Content-Disposition']); {do not localize}
end;
end;
function TIdMessageDecoderMIME.RemoveInvalidCharsFromFilename(const AFilename: string): string;
const
// MtW: Inversed: see http://support.microsoft.com/default.aspx?scid=kb;en-us;207188
InvalidWindowsFilenameChars = '\/:*?"<>|'; {do not localize}
var
LN: integer;
{$IFDEF STRING_IS_IMMUTABLE}
LSB: TIdStringBuilder;
{$ENDIF}
begin
Result := AFilename;
//First, strip any Windows or Unix path...
for LN := Length(Result) downto 1 do begin
if ((Result[LN] = '/') or (Result[LN] = '\')) then begin {do not localize}
Result := Copy(Result, LN+1, MaxInt);
Break;
end;
end;
//Now remove any invalid filename chars.
//Hmm - this code will be less buggy if I just replace them with _
{$IFDEF STRING_IS_IMMUTABLE}
LSB := TIdStringBuilder.Create(Result);
for LN := 0 to LSB.Length-1 do begin
// MtW: WAS: if Pos(Result[LN], ValidWindowsFilenameChars) = 0 then begin
if Pos(LSB[LN], InvalidWindowsFilenameChars) > 0 then begin
LSB[LN] := '_'; {do not localize}
end;
end;
{$ELSE}
for LN := 1 to Length(Result) do begin
// MtW: WAS: if Pos(Result[LN], ValidWindowsFilenameChars) = 0 then begin
if Pos(Result[LN], InvalidWindowsFilenameChars) > 0 then begin
Result[LN] := '_'; {do not localize}
end;
end;
{$ENDIF}
end;
{ TIdMessageEncoderInfoMIME }
constructor TIdMessageEncoderInfoMIME.Create;
begin
inherited;
FMessageEncoderClass := TIdMessageEncoderMIME;
end;
procedure TIdMessageEncoderInfoMIME.InitializeHeaders(AMsg: TIdMessage);
begin
{CC2: The following logic does not work - it assumes that just because there
are related parts, that the message header is multipart/related, whereas it
could be multipart/related inside multipart/alternative, plus there are other
issues.
But...it works on simple emails, and it is better than throwing an exception.
User must specify the ContentType to get the right results.}
{CC4: removed addition of boundaries; now added at GenerateHeader stage (could
end up with boundary added more than once)}
if AMsg.ContentType = '' then begin
if AMsg.MessageParts.RelatedPartCount > 0 then begin
AMsg.ContentType := 'multipart/related; type="multipart/alternative"'; //; boundary="' + {do not localize}
end else begin
if AMsg.MessageParts.AttachmentCount > 0 then begin
AMsg.ContentType := 'multipart/mixed'; //; boundary="' {do not localize}
end else begin
if AMsg.MessageParts.TextPartCount > 0 then begin
AMsg.ContentType := 'multipart/alternative'; //; boundary="' {do not localize}
end;
end;
end;
end;
end;
{ TIdMessageEncoderMIME }
procedure TIdMessageEncoderMIME.Encode(ASrc: TStream; ADest: TStream);
var
s: string;
LEncoder: TIdEncoderMIME;
LSPos, LSSize : TIdStreamSize;
begin
ASrc.Position := 0;
LSPos := 0;
LSSize := ASrc.Size;
LEncoder := TIdEncoderMIME.Create(nil);
try
while LSPos < LSSize do begin
s := LEncoder.Encode(ASrc, 57) + EOL;
Inc(LSPos, 57);
WriteStringToStream(ADest, s);
end;
finally
FreeAndNil(LEncoder);
end;
end;
procedure TIdMessageDecoderMIME.InitComponent;
begin
inherited InitComponent;
FBodyEncoded := False;
if Owner is TIdMessage then begin
FMIMEBoundary := TIdMessage(Owner).MIMEBoundary.Boundary;
{CC2: Check to see if this is an email of the type that is headers followed
by the body encoded in base64 or quoted-printable. The problem with this type
is that the header may state it as MIME, but the MIME parts and their headers
will be encoded, so we won't find them - in this case, we will later take
all the info we need from the message header, and not try to take it from
the part header.}
if TIdMessage(Owner).ContentTransferEncoding <> '' then begin
// RLebeau 12/26/2014 - According to RFC 2045 Section 6.4:
// "If an entity is of type "multipart" the Content-Transfer-Encoding is not
// permitted to have any value other than "7bit", "8bit" or "binary"."
//
// However, came across one message where the "Content-Type" was set to
// "multipart/related" and the "Content-Transfer-Encoding" was set to
// "quoted-printable". Outlook and Thunderbird were apparently able to parse
// the message correctly, but Indy was not. So let's check for that scenario
// and ignore illegal "Content-Transfer-Encoding" values if present...
if (not IsHeaderMediaType(TIdMessage(Owner).ContentType, 'multipart')) and
{CC2: added 8bit below, changed to TextIsSame. Reason is that many emails
set the Content-Transfer-Encoding to 8bit, have multiple parts, and display
the part header in plain-text.}
(PosInStrArray(TIdMessage(Owner).ContentTransferEncoding, ['8bit', '7bit', 'binary'], False) = -1) {do not localize}
then begin
FBodyEncoded := True;
end;
end;
end;
end;
initialization
TIdMessageDecoderList.RegisterDecoder('MIME' {Do not Localize}
, TIdMessageDecoderInfoMIME.Create);
TIdMessageEncoderList.RegisterEncoder('MIME' {Do not Localize}
, TIdMessageEncoderInfoMIME.Create);
finalization
end.
Reference in New Issue View Git Blame Copy Permalink