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RabbitMQ AMQP Client
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Files
src/uri_parser.erl
%% This file is a copy of http_uri.erl from the R13B-1 Erlang/OTP
%% distribution with several modifications.
%% All modifications are Copyright (c) 2009-2014 GoPivotal, Ltd.
%% ``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 via the world wide web 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.
%%
%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
%% AB. All Rights Reserved.''
%% See http://tools.ietf.org/html/rfc3986
-module(uri_parser).
-export([parse/2]).
%%%=========================================================================
%%% API
%%%=========================================================================
%% Returns a key list of elements extracted from the URI. Note that
%% only 'scheme' is guaranteed to exist. Key-Value pairs from the
%% Defaults list will be used absence of a non-empty value extracted
%% from the URI. The values extracted are strings, except for 'port'
%% which is an integer, 'userinfo' which is a list of strings (split
%% on $:), and 'query' which is a list of strings where no $= char
%% found, or a {key,value} pair where a $= char is found (initial
%% split on $& and subsequent optional split on $=). Possible keys
%% are: 'scheme', 'userinfo', 'host', 'port', 'path', 'query',
%% 'fragment'.
-spec parse(AbsURI :: string() | binary(), Defaults :: list()) -> string().
parse(AbsURI, Defaults) ->
AbsUriString = rabbit_data_coercion:to_list(AbsURI),
case parse_scheme(AbsUriString) of
{error, Reason} ->
{error, Reason};
{Scheme, Rest} ->
case (catch parse_uri_rest(Rest, true)) of
[_|_] = List ->
merge_keylists([{scheme, Scheme} | List], Defaults);
E ->
{error, {malformed_uri, AbsURI, E}}
end
end.
%%%========================================================================
%%% Internal functions
%%%========================================================================
parse_scheme(AbsURI) ->
split_uri(AbsURI, ":", {error, no_scheme}).
parse_uri_rest("//" ++ URIPart, true) ->
%% we have an authority
{Authority, PathQueryFrag} =
split_uri(URIPart, "/|\\?|#", {URIPart, ""}, 1, 0),
AuthorityParts = parse_authority(Authority),
parse_uri_rest(PathQueryFrag, false) ++ AuthorityParts;
parse_uri_rest(PathQueryFrag, _Bool) ->
%% no authority, just a path and maybe query
{PathQuery, Frag} = split_uri(PathQueryFrag, "#", {PathQueryFrag, ""}),
{Path, QueryString} = split_uri(PathQuery, "\\?", {PathQuery, ""}),
QueryPropList = split_query(QueryString),
[{path, Path}, {'query', QueryPropList}, {fragment, Frag}].
parse_authority(Authority) ->
{UserInfo, HostPort} = split_uri(Authority, "@", {"", Authority}),
UserInfoSplit = case re:split(UserInfo, ":", [{return, list}]) of
[""] -> [];
UIS -> UIS
end,
[{userinfo, UserInfoSplit} | parse_host_port(HostPort)].
parse_host_port("[" ++ HostPort) -> %ipv6
{Host, ColonPort} = split_uri(HostPort, "\\]", {HostPort, ""}),
[{host, Host} | case split_uri(ColonPort, ":", not_found, 0, 1) of
not_found -> case ColonPort of
[] -> [];
_ -> throw({invalid_port, ColonPort})
end;
{_, Port} -> [{port, list_to_integer(Port)}]
end];
parse_host_port(HostPort) ->
{Host, Port} = split_uri(HostPort, ":", {HostPort, not_found}),
[{host, Host} | case Port of
not_found -> [];
_ -> [{port, list_to_integer(Port)}]
end].
split_query(Query) ->
case re:split(Query, "&", [{return, list}]) of
[""] -> [];
QParams -> [split_uri(Param, "=", Param) || Param <- QParams]
end.
split_uri(UriPart, SplitChar, NoMatchResult) ->
split_uri(UriPart, SplitChar, NoMatchResult, 1, 1).
split_uri(UriPart, SplitChar, NoMatchResult, SkipLeft, SkipRight) ->
case re:run(UriPart, SplitChar) of
{match, [{Match, _}]} ->
{string:substr(UriPart, 1, Match + 1 - SkipLeft),
string:substr(UriPart, Match + 1 + SkipRight, length(UriPart))};
nomatch ->
NoMatchResult
end.
merge_keylists(A, B) ->
{AEmpty, ANonEmpty} = lists:partition(fun ({_Key, V}) -> V =:= [] end, A),
[AEmptyS, ANonEmptyS, BS] =
[lists:ukeysort(1, X) || X <- [AEmpty, ANonEmpty, B]],
lists:ukeymerge(1, lists:ukeymerge(1, ANonEmptyS, BS), AEmptyS).