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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2001-2009. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% 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.
+%%
+%% %CopyrightEnd%
+%%
+%%
+-module(mod_range).
+-export([do/1]).
+-include("httpd.hrl").
+
+%% do
+
+do(Info) ->
+ ?DEBUG("do -> entry",[]),
+ case Info#mod.method of
+ "GET" ->
+ case proplists:get_value(status, Info#mod.data) of
+ %% A status code has been generated!
+ {_StatusCode, _PhraseArgs, _Reason} ->
+ {proceed,Info#mod.data};
+ %% No status code has been generated!
+ undefined ->
+ case proplists:get_value(response, Info#mod.data) of
+ %% No response has been generated!
+ undefined ->
+ case proplists:get_value("range",
+ Info#mod.parsed_header) of
+ undefined ->
+ %Not a range response
+ {proceed,Info#mod.data};
+ Range ->
+ %%Control that there weren't a
+ %%if-range field that stopped The
+ %%range request in favor for the
+ %%whole file
+ case proplists:get_value(if_range,
+ Info#mod.data) of
+ send_file ->
+ {proceed,Info#mod.data};
+ _undefined ->
+ do_get_range(Info,Range)
+ end
+ end;
+ %% A response has been generated or sent!
+ _Response ->
+ {proceed, Info#mod.data}
+ end
+ end;
+ %% Not a GET method!
+ _ ->
+ {proceed,Info#mod.data}
+ end.
+
+do_get_range(Info,Ranges) ->
+ ?DEBUG("do_get_range -> Request URI: ~p",[Info#mod.request_uri]),
+ Path = mod_alias:path(Info#mod.data, Info#mod.config_db,
+ Info#mod.request_uri),
+ {FileInfo, LastModified} = get_modification_date(Path),
+ send_range_response(Path, Info, Ranges, FileInfo, LastModified).
+
+
+send_range_response(Path, Info, Ranges, FileInfo, LastModified)->
+ case parse_ranges(Ranges) of
+ error->
+ ?ERROR("send_range_response-> Unparsable range request",[]),
+ {proceed,Info#mod.data};
+ {multipart,RangeList}->
+ send_multi_range_response(Path, Info, RangeList);
+ {Start,Stop}->
+ send_range_response(Path, Info, Start, Stop, FileInfo,
+ LastModified)
+ end.
+%%More than one range specified
+%%Send a multipart reponse to the user
+%
+%%An example of an multipart range response
+
+% HTTP/1.1 206 Partial Content
+% Date:Wed 15 Nov 1995 04:08:23 GMT
+% Last-modified:Wed 14 Nov 1995 04:08:23 GMT
+% Content-type: multipart/byteranges; boundary="SeparatorString"
+%
+% --"SeparatorString"
+% Content-Type: application/pdf
+% Content-Range: bytes 500-600/1010
+% .... The data..... 101 bytes
+%
+% --"SeparatorString"
+% Content-Type: application/pdf
+% Content-Range: bytes 700-1009/1010
+% .... The data.....
+
+
+
+send_multi_range_response(Path,Info,RangeList)->
+ case file:open(Path, [raw,binary]) of
+ {ok, FileDescriptor} ->
+ file:close(FileDescriptor),
+ ?DEBUG("send_multi_range_response -> FileDescriptor: ~p",
+ [FileDescriptor]),
+ Suffix = httpd_util:suffix(Path),
+ PartMimeType = httpd_util:lookup_mime_default(Info#mod.config_db,
+ Suffix,"text/plain"),
+ {FileInfo, LastModified} = get_modification_date(Path),
+ case valid_ranges(RangeList,Path,FileInfo) of
+ {ValidRanges,true}->
+ ?DEBUG("send_multi_range_response ->Ranges are valid:",[]),
+ %Apache breaks the standard by sending the size
+ %field in the Header.
+ Header =
+ [{code,206},
+ {content_type, "multipart/byteranges;boundary"
+ "=RangeBoundarySeparator"},
+ {etag, httpd_util:create_etag(FileInfo)} |
+ LastModified],
+ ?DEBUG("send_multi_range_response -> Valid Ranges: ~p",
+ [RagneList]),
+ Body = {fun send_multiranges/4,
+ [ValidRanges, Info, PartMimeType, Path]},
+ {proceed,[{response,
+ {response, Header, Body}} | Info#mod.data]};
+ _ ->
+ {proceed, [{status, {416, "Range not valid",
+ bad_range_boundaries }}]}
+ end;
+ {error, _Reason} ->
+ ?ERROR("do_get -> failed open file: ~p",[_Reason]),
+ {proceed,Info#mod.data}
+ end.
+
+send_multiranges(ValidRanges,Info,PartMimeType,Path)->
+ ?DEBUG("send_multiranges -> Start sending the ranges",[]),
+ case file:open(Path, [raw,binary]) of
+ {ok,FileDescriptor} ->
+ lists:foreach(fun(Range)->
+ send_multipart_start(Range,
+ Info,
+ PartMimeType,
+ FileDescriptor)
+ end,ValidRanges),
+ file:close(FileDescriptor),
+ %%Sends an end of the multipart
+ httpd_socket:deliver(Info#mod.socket_type,Info#mod.socket,
+ "\r\n--RangeBoundarySeparator--"),
+ sent;
+ _ ->
+ close
+ end.
+
+send_multipart_start({{Start,End},{StartByte,EndByte,Size}},Info,
+ PartMimeType,FileDescriptor)
+ when StartByte < Size ->
+ PartHeader=["\r\n--RangeBoundarySeparator\r\n","Content-type: ",
+ PartMimeType,"\r\n",
+ "Content-Range:bytes=",integer_to_list(StartByte),"-",
+ integer_to_list(EndByte),"/",
+ integer_to_list(Size),"\r\n\r\n"],
+ send_part_start(Info#mod.socket_type, Info#mod.socket, PartHeader,
+ FileDescriptor, Start, End);
+
+
+send_multipart_start({{Start,End},{StartByte,EndByte,Size}}, Info,
+ PartMimeType, FileDescriptor)->
+ PartHeader=["\r\n--RangeBoundarySeparator\r\n","Content-type: ",
+ PartMimeType,"\r\n",
+ "Content-Range:bytes=",integer_to_list(Size-(StartByte-Size)),
+ "-",integer_to_list(EndByte),"/",
+ integer_to_list(Size),"\r\n\r\n"],
+ send_part_start(Info#mod.socket_type, Info#mod.socket, PartHeader,
+ FileDescriptor, Start, End).
+
+send_part_start(SocketType, Socket, PartHeader, FileDescriptor, Start, End)->
+ case httpd_socket:deliver(SocketType, Socket, PartHeader) of
+ ok ->
+ send_part_start(SocketType,Socket,FileDescriptor,Start,End);
+ _ ->
+ close
+ end.
+
+send_range_response(Path, Info, Start, Stop, FileInfo, LastModified)->
+ case file:open(Path, [raw,binary]) of
+ {ok, FileDescriptor} ->
+ file:close(FileDescriptor),
+ ?DEBUG("send_range_response -> FileDescriptor: ~p",
+ [FileDescriptor]),
+ Suffix = httpd_util:suffix(Path),
+ MimeType = httpd_util:lookup_mime_default(Info#mod.config_db,
+ Suffix,"text/plain"),
+ Size = get_range_size(Start,Stop,FileInfo),
+ case valid_range(Start,Stop,FileInfo) of
+ {true,StartByte,EndByte,TotByte}->
+ Head =[{code,206},{content_type, MimeType},
+ {etag, httpd_util:create_etag(FileInfo)},
+ {content_range,["bytes=",
+ integer_to_list(StartByte),"-",
+ integer_to_list(EndByte),"/",
+ integer_to_list(TotByte)]},
+ {content_length, Size} | LastModified],
+ BodyFunc = fun send_range_body/5,
+ Arg = [Info#mod.socket_type,
+ Info#mod.socket, Path, Start, Stop],
+ {proceed,[{response,{response ,Head, {BodyFunc,Arg}}}|
+ Info#mod.data]};
+ {false,Reason} ->
+ {proceed, [{status, {416, Reason, bad_range_boundaries }}]}
+ end;
+ {error, _Reason} ->
+ ?ERROR("send_range_response -> failed open file: ~p",[_Reason]),
+ {proceed,Info#mod.data}
+ end.
+
+
+send_range_body(SocketType,Socket,Path,Start,End) ->
+ ?DEBUG("mod_range -> send_range_body",[]),
+ case file:open(Path, [raw,binary]) of
+ {ok,FileDescriptor} ->
+ send_part_start(SocketType,Socket,FileDescriptor,Start,End),
+ file:close(FileDescriptor);
+ _ ->
+ close
+ end.
+
+send_part_start(SocketType,Socket,FileDescriptor,Start,End) ->
+ case Start of
+ from_end ->
+ file:position(FileDescriptor,{eof,End}),
+ send_body(SocketType,Socket,FileDescriptor);
+ from_start ->
+ file:position(FileDescriptor,{bof,End}),
+ send_body(SocketType,Socket,FileDescriptor);
+ Byte when is_integer(Byte) ->
+ file:position(FileDescriptor,{bof,Start}),
+ send_part(SocketType,Socket,FileDescriptor,End)
+ end,
+ sent.
+
+
+%%This function could replace send_body by calling it with Start=0 end
+%%=FileSize But i gues it would be stupid when we look at performance
+send_part(SocketType,Socket,FileDescriptor,End)->
+ case file:position(FileDescriptor,{cur,0}) of
+ {ok,NewPos} ->
+ if
+ NewPos > End ->
+ ok;
+ true ->
+ Size = get_file_chunk_size(NewPos,End,?FILE_CHUNK_SIZE),
+ case file:read(FileDescriptor,Size) of
+ eof ->
+ ok;
+ {error, _Reason} ->
+ ok;
+ {ok,Binary} ->
+ case httpd_socket:deliver(SocketType,Socket,
+ Binary) of
+ socket_closed ->
+ ?LOG("send_range of body -> socket "
+ "closed while sending",[]),
+ socket_close;
+ _ ->
+ send_part(SocketType,Socket,
+ FileDescriptor,End)
+ end
+ end
+ end;
+ _->
+ ok
+ end.
+
+%% validate that the range is in the limits of the file
+valid_ranges(RangeList, _Path, FileInfo)->
+ lists:mapfoldl(fun({Start,End},Acc)->
+ case Acc of
+ true ->
+ case valid_range(Start,End,FileInfo) of
+ {true,StartB,EndB,Size}->
+ {{{Start,End},
+ {StartB,EndB,Size}},true};
+ _ ->
+ false
+ end;
+ _ ->
+ {false,false}
+ end
+ end,true,RangeList).
+
+
+
+valid_range(from_end,End,FileInfo)->
+ Size=FileInfo#file_info.size,
+ if
+ End < Size ->
+ {true,(Size+End),Size-1,Size};
+ true ->
+ false
+ end;
+valid_range(from_start,End,FileInfo)->
+ Size=FileInfo#file_info.size,
+ if
+ End < Size ->
+ {true,End,Size-1,Size};
+ true ->
+ false
+ end;
+
+valid_range(Start,End,FileInfo) when Start =< End ->
+ case FileInfo#file_info.size of
+ FileSize when Start< FileSize ->
+ case FileInfo#file_info.size of
+ Size when End<Size ->
+ {true,Start,End,FileInfo#file_info.size};
+ Size ->
+ {true,Start,Size-1,Size}
+ end;
+ _->
+ {false,"The size of the range is negative"}
+ end;
+
+valid_range(_Start,_End,_FileInfo)->
+ {false,"Range starts out of file boundaries"}.
+%% Find the modification date of the file
+get_modification_date(Path)->
+ case file:read_file_info(Path) of
+ {ok, FileInfo0} ->
+ case (catch httpd_util:rfc1123_date(FileInfo0#file_info.mtime)) of
+ Date when is_list(Date) ->
+ {FileInfo0, [{last_modified, Date}]};
+ _ ->
+ {FileInfo0, []}
+ end;
+ _ ->
+ {#file_info{}, []}
+ end.
+
+%Calculate the size of the chunk to read
+
+get_file_chunk_size(Position, End, DefaultChunkSize)
+ when (Position+DefaultChunkSize) =< End ->
+ DefaultChunkSize;
+get_file_chunk_size(Position, End, _DefaultChunkSize) ->
+ (End-Position) +1.
+
+
+
+%Get the size of the range to send. Remember that
+%A range is from startbyte up to endbyte which means that
+%the nuber of byte in a range is (StartByte-EndByte)+1
+
+get_range_size(from_end, Stop, _FileInfo)->
+ integer_to_list(-1*Stop);
+
+get_range_size(from_start, StartByte, FileInfo) ->
+ integer_to_list((((FileInfo#file_info.size)-StartByte)));
+
+get_range_size(StartByte, EndByte, _FileInfo) ->
+ integer_to_list((EndByte-StartByte)+1).
+
+parse_ranges("\bytes\=" ++ Ranges)->
+ parse_ranges("bytes\=" ++ Ranges);
+parse_ranges("bytes\=" ++ Ranges)->
+ case string:tokens(Ranges,", ") of
+ [Range] ->
+ parse_range(Range);
+ [Range1|SplittedRanges]->
+ {multipart,lists:map(fun parse_range/1,[Range1|SplittedRanges])}
+ end;
+%Bad unit
+parse_ranges(Ranges)->
+ io:format("Bad Ranges : ~p",[Ranges]),
+ error.
+%Parse the range specification from the request to {Start,End}
+%Start=End : Numreric string | []
+
+parse_range(Range)->
+ format_range(split_range(Range,[],[])).
+format_range({[],BytesFromEnd})->
+ {from_end,-1*(list_to_integer(BytesFromEnd))};
+format_range({StartByte,[]})->
+ {from_start,list_to_integer(StartByte)};
+format_range({StartByte,EndByte})->
+ {list_to_integer(StartByte),list_to_integer(EndByte)}.
+%Last case return the splitted range
+split_range([],Current,Other)->
+ {lists:reverse(Other),lists:reverse(Current)};
+
+split_range([$-|Rest],Current,Other)->
+ split_range(Rest,Other,Current);
+
+split_range([N|Rest],Current,End) ->
+ split_range(Rest,[N|Current],End).
+
+send_body(SocketType,Socket,FileDescriptor) ->
+ case file:read(FileDescriptor,?FILE_CHUNK_SIZE) of
+ {ok,Binary} ->
+ ?DEBUG("send_body -> send another chunk: ~p",[size(Binary)]),
+ case httpd_socket:deliver(SocketType,Socket,Binary) of
+ socket_closed ->
+ ?LOG("send_body -> socket closed while sending",[]),
+ socket_close;
+ _ ->
+ send_body(SocketType,Socket,FileDescriptor)
+ end;
+ eof ->
+ ?DEBUG("send_body -> done with this file",[]),
+ eof
+ end.