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%% ``The contents of this file are subject to the Erlang Public License,
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%% Version 1.1, (the "License"); you may not use this file except in
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%% compliance with the License. You should have received a copy of the
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%% Erlang Public License along with this software. If not, it can be
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%% retrieved via the world wide web at http://www.erlang.org/.
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%% Software distributed under the License is distributed on an "AS IS"
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%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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%% the License for the specific language governing rights and limitations
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%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
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%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
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%% AB. All Rights Reserved.''
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-module(mod_responsecontrol).
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-include("httpd.hrl").
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?DEBUG("do -> response_control",[]),
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case httpd_util:key1search(Info#mod.data,status) of
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%% A status code has been generated!
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{StatusCode,PhraseArgs,Reason} ->
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{proceed,Info#mod.data};
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%% No status code has been generated!
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case httpd_util:key1search(Info#mod.data,response) of
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%% No response has been generated!
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case do_responsecontrol(Info) of
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{proceed,Info#mod.data};
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{proceed,[Response|Info#mod.data]}
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%% A response has been generated or sent!
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{proceed,Info#mod.data}
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%%----------------------------------------------------------------------
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%%Control that the request header did not contians any limitations
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%%wheather a response shall be createed or not
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%%----------------------------------------------------------------------
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do_responsecontrol(Info) ->
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?DEBUG("do_response_control -> Request URI: ~p",[Info#mod.request_uri]),
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Path = mod_alias:path(Info#mod.data, Info#mod.config_db,
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Info#mod.request_uri),
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case file:read_file_info(Path) of
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control(Path,Info,FileInfo);
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%% The requested asset is not a plain file and then it must
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%% be generated everytime its requested
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%%----------------------------------------------------------------------
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%%Control the If-Match, If-None-Match, and If-Modified-Since
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%%----------------------------------------------------------------------
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%% If a client sends more then one of the if-XXXX fields in a request
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%% The standard says it does not specify the behaviuor so I specified it :-)
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%% The priority between the fields is
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%% This means if more than one of the fields are in the request the
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%% field with highest priority will be used
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%%If the request is a range request the If-Range field will be the winner.
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control(Path,Info,FileInfo)->
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case control_range(Path,Info,FileInfo) of
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case control_Etag(Path,Info,FileInfo) of
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case control_modification(Path,Info,FileInfo) of
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send_return_value(ReturnValue,FileInfo)
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send_return_value(ReturnValue,FileInfo)
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%%----------------------------------------------------------------------
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%%If there are both a range and an if-range field control if
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%%----------------------------------------------------------------------
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control_range(Path,Info,FileInfo) ->
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case httpd_util:key1search(Info#mod.parsed_header,"range") of
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case httpd_util:key1search(Info#mod.parsed_header,"if-range") of
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control_if_range(Path,Info,FileInfo,EtagOrDate)
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control_if_range(Path,Info,FileInfo,EtagOrDate) ->
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case httpd_util:convert_request_date(strip_date(EtagOrDate)) of
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FileEtag=httpd_util:create_etag(FileInfo),
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%%We got the date in the request if it is
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case control_modification_data(Info,FileInfo#file_info.mtime,"if-range") of
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{if_range,send_file};
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_UnmodifiedOrUndefined->
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%%----------------------------------------------------------------------
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%%Controls the values of the If-Match and I-None-Mtch
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%%----------------------------------------------------------------------
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control_Etag(Path,Info,FileInfo)->
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FileEtag=httpd_util:create_etag(FileInfo),
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%%Control if the E-Tag for the resource matches one of the Etags in
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%%the -if-match header field
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case control_match(Info,FileInfo,"if-match",FileEtag) of
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%%None of the Etags in the if-match field matched the current
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%%Etag for the resource return a 304
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case control_match(Info,FileInfo,"if-none-match",FileEtag) of
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case Info#mod.method of
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_OtherrequestMethod ->
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%%----------------------------------------------------------------------
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%%Control if there are any Etags for HeaderField in the request if so
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%%Control if they match the Etag for the requested file
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%%----------------------------------------------------------------------
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control_match(Info,FileInfo,HeaderField,FileEtag)->
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case split_etags(httpd_util:key1search(Info#mod.parsed_header,HeaderField)) of
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%%Control that the match any star not is availible
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case lists:member("*",Etags) of
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compare_etags(FileEtag,Etags)
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%%----------------------------------------------------------------------
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%%Split the etags from the request
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%%----------------------------------------------------------------------
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split_etags(undefined)->
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string:tokens(Tags,", ").
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%%----------------------------------------------------------------------
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%%Control if the etag for the file is in the list
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%%----------------------------------------------------------------------
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compare_etags(Tag,Etags) ->
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case lists:member(Tag,Etags) of
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%Control if the file is modificated %%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%----------------------------------------------------------------------
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%%Control the If-Modified-Since and If-Not-Modified-Since header fields
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%%----------------------------------------------------------------------
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control_modification(Path,Info,FileInfo)->
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?DEBUG("control_modification() -> entry",[]),
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case control_modification_data(Info,FileInfo#file_info.mtime,"if-modified-since") of
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case control_modification_data(Info,FileInfo#file_info.mtime,"if-unmodified-since") of
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_ContinueUndefined ->
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%%----------------------------------------------------------------------
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%%Controls the date from the http-request if-modified-since and
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%%if-not-modified-since against the modification data of the
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%%----------------------------------------------------------------------
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%%Info is the record about the request
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%%ModificationTime is the time the file was edited last
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%%Header Field is the name of the field to control
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control_modification_data(Info,ModificationTime,HeaderField)->
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case strip_date(httpd_util:key1search(Info#mod.parsed_header,HeaderField)) of
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LastModified=httpd_util:convert_request_date(LastModified0),
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?DEBUG("control_modification_data() -> "
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"~n Request-Field: ~s"
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"~n FileLastModified: ~p"
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[HeaderField,ModificationTime,LastModified]),
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FileTime=calendar:datetime_to_gregorian_seconds(ModificationTime),
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FieldTime=calendar:datetime_to_gregorian_seconds(LastModified),
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FileTime=<FieldTime ->
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?DEBUG("File unmodified~n", []),
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FileTime>=FieldTime ->
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?DEBUG("File modified~n", []),
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%%----------------------------------------------------------------------
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%%Compare to dates on the form {{YYYY,MM,DD},{HH,MIN,SS}}
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%%If the first date is the biggest returns biggest1 (read biggestFirst)
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%%If the first date is smaller
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% compare_date(Date,bad_date)->
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% compare_date({D1,T1},{D2,T2})->
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% case compare_date1(D1,D2) of
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% compare_date1(T1,T2);
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% compare_date1({T1,T2,T3},{T12,T22,T32}) when T1>T12 ->
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% compare_date1({T1,T2,T3},{T1,T22,T32}) when T2>T22 ->
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% compare_date1({T1,T2,T3},{T1,T2,T32}) when T3>T32 ->
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% compare_date1({T1,T2,T3},{T1,T2,T3})->
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% compare_date1(_D1,_D2)->
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%% IE4 & NS4 sends an extra '; length=xxxx' string at the end of the If-Modified-Since
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%% header, we detect this and ignore it (the RFCs does not mention this).
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strip_date(undefined) ->
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strip_date([$;,$ |Rest]) ->
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strip_date([C|Rest]) ->
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[C|strip_date(Rest)].
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send_return_value({412,_,_},FileInfo)->
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{status,{412,none,"Precondition Failed"}};
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send_return_value({304,Info,Path},FileInfo)->
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Suffix=httpd_util:suffix(Path),
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MimeType = httpd_util:lookup_mime_default(Info#mod.config_db,Suffix,"text/plain"),
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Header = [{code,304},
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{etag,httpd_util:create_etag(FileInfo)},
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{last_modified,httpd_util:rfc1123_date(FileInfo#file_info.mtime)}],
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{response,{response,Header,nobody}}.
added
removed
lib/inets/src/mod_responsecontrol.erl
