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Diffstat (limited to 'deps/chttpd/src/chttpd_db.erl')
| -rw-r--r-- | deps/chttpd/src/chttpd_db.erl | 1264 |
1 files changed, 1264 insertions, 0 deletions
diff --git a/deps/chttpd/src/chttpd_db.erl b/deps/chttpd/src/chttpd_db.erl new file mode 100644 index 00000000..463aaa10 --- /dev/null +++ b/deps/chttpd/src/chttpd_db.erl @@ -0,0 +1,1264 @@ +% Licensed under the Apache License, Version 2.0 (the "License"); you may not +% use this file except in compliance with the License. You may obtain a copy of +% the License at +% +% http://www.apache.org/licenses/LICENSE-2.0 +% +% Unless required by applicable law or agreed to in writing, software +% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT +% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the +% License for the specific language governing permissions and limitations under +% the License. + +-module(chttpd_db). +-include_lib("couch/include/couch_db.hrl"). + +-export([handle_request/1, handle_compact_req/2, handle_design_req/2, + db_req/2, couch_doc_open/4,handle_changes_req/2, + update_doc_result_to_json/1, update_doc_result_to_json/2, + handle_design_info_req/3, handle_view_cleanup_req/2]). + +-import(chttpd, + [send_json/2,send_json/3,send_json/4,send_method_not_allowed/2, + start_json_response/2,send_chunk/2,end_json_response/1, + start_chunked_response/3, absolute_uri/2, send/2, + start_response_length/4]). + +-record(doc_query_args, { + options = [], + rev = nil, + open_revs = [], + update_type = interactive_edit, + atts_since = nil +}). + +% Database request handlers +handle_request(#httpd{path_parts=[DbName|RestParts],method=Method, + db_url_handlers=DbUrlHandlers}=Req)-> + case {Method, RestParts} of + {'PUT', []} -> + create_db_req(Req, DbName); + {'DELETE', []} -> + % if we get ?rev=... the user is using a faulty script where the + % document id is empty by accident. Let them recover safely. + case couch_httpd:qs_value(Req, "rev", false) of + false -> delete_db_req(Req, DbName); + _Rev -> throw({bad_request, + "You tried to DELETE a database with a ?=rev parameter. " + ++ "Did you mean to DELETE a document instead?"}) + end; + {_, []} -> + do_db_req(Req, fun db_req/2); + {_, [SecondPart|_]} -> + Handler = couch_util:get_value(SecondPart, DbUrlHandlers, fun db_req/2), + do_db_req(Req, Handler) + end. + +handle_changes_req(#httpd{method='GET'}=Req, Db) -> + #changes_args{filter=Raw, style=Style} = Args0 = parse_changes_query(Req), + ChangesArgs = Args0#changes_args{ + filter = couch_changes:configure_filter(Raw, Style, Req, Db) + }, + case ChangesArgs#changes_args.feed of + "normal" -> + T0 = now(), + {ok, Info} = fabric:get_db_info(Db), + Etag = chttpd:make_etag(Info), + DeltaT = timer:now_diff(now(), T0) / 1000, + couch_stats_collector:record({couchdb, dbinfo}, DeltaT), + chttpd:etag_respond(Req, Etag, fun() -> + fabric:changes(Db, fun changes_callback/2, {"normal", {"Etag",Etag}, Req}, + ChangesArgs) + end); + Feed -> + % "longpoll" or "continuous" + fabric:changes(Db, fun changes_callback/2, {Feed, Req}, ChangesArgs) + end; +handle_changes_req(#httpd{path_parts=[_,<<"_changes">>]}=Req, _Db) -> + send_method_not_allowed(Req, "GET,HEAD"). + +% callbacks for continuous feed (newline-delimited JSON Objects) +changes_callback(start, {"continuous", Req}) -> + {ok, Resp} = chttpd:start_delayed_json_response(Req, 200), + {ok, {"continuous", Resp}}; +changes_callback({change, Change}, {"continuous", Resp}) -> + {ok, Resp1} = chttpd:send_delayed_chunk(Resp, [?JSON_ENCODE(Change) | "\n"]), + {ok, {"continuous", Resp1}}; +changes_callback({stop, EndSeq0}, {"continuous", Resp}) -> + EndSeq = case is_old_couch(Resp) of true -> 0; false -> EndSeq0 end, + {ok, Resp1} = chttpd:send_delayed_chunk(Resp, + [?JSON_ENCODE({[{<<"last_seq">>, EndSeq}]}) | "\n"]), + chttpd:end_delayed_json_response(Resp1); + +% callbacks for longpoll and normal (single JSON Object) +changes_callback(start, {"normal", {"Etag", Etag}, Req}) -> + FirstChunk = "{\"results\":[\n", + {ok, Resp} = chttpd:start_delayed_json_response(Req, 200, + [{"Etag",Etag}], FirstChunk), + {ok, {"", Resp}}; +changes_callback(start, {_, Req}) -> + FirstChunk = "{\"results\":[\n", + {ok, Resp} = chttpd:start_delayed_json_response(Req, 200, [], FirstChunk), + {ok, {"", Resp}}; +changes_callback({change, Change}, {Prepend, Resp}) -> + {ok, Resp1} = chttpd:send_delayed_chunk(Resp, [Prepend, ?JSON_ENCODE(Change)]), + {ok, {",\r\n", Resp1}}; +changes_callback({stop, EndSeq}, {_, Resp}) -> + {ok, Resp1} = case is_old_couch(Resp) of + true -> + chttpd:send_delayed_chunk(Resp, "\n],\n\"last_seq\":0}\n"); + false -> + chttpd:send_delayed_chunk(Resp, + ["\n],\n\"last_seq\":", ?JSON_ENCODE(EndSeq), "}\n"]) + end, + chttpd:end_delayed_json_response(Resp1); + +changes_callback(timeout, {Prepend, Resp}) -> + {ok, Resp1} = chttpd:send_delayed_chunk(Resp, "\n"), + {ok, {Prepend, Resp1}}; +changes_callback({error, Reason}, {_, Resp}) -> + chttpd:send_delayed_error(Resp, Reason). + +is_old_couch(Resp) -> + MochiReq = chttpd:get_delayed_req(Resp), + case MochiReq:get_header_value("user-agent") of + undefined -> + false; + "CouchDB/1.0.0" -> + true; + UserAgent -> + string:str(UserAgent, "CouchDB/0") > 0 + end. + +handle_compact_req(Req, _) -> + Msg = <<"Compaction must be triggered on a per-shard basis in BigCouch">>, + couch_httpd:send_error(Req, 403, forbidden, Msg). + +handle_view_cleanup_req(Req, Db) -> + ok = fabric:cleanup_index_files(Db), + send_json(Req, 202, {[{ok, true}]}). + +handle_design_req(#httpd{ + path_parts=[_DbName, _Design, Name, <<"_",_/binary>> = Action | _Rest], + design_url_handlers = DesignUrlHandlers + }=Req, Db) -> + case fabric:open_doc(Db, <<"_design/", Name/binary>>, []) of + {ok, DDoc} -> + Handler = couch_util:get_value(Action, DesignUrlHandlers, + fun bad_action_req/3), + Handler(Req, Db, DDoc); + Error -> + throw(Error) + end; + +handle_design_req(Req, Db) -> + db_req(Req, Db). + +bad_action_req(#httpd{path_parts=[_, _, Name|FileNameParts]}=Req, Db, _DDoc) -> + db_attachment_req(Req, Db, <<"_design/",Name/binary>>, FileNameParts). + +handle_design_info_req(#httpd{method='GET'}=Req, Db, #doc{id=Id} = DDoc) -> + {ok, GroupInfoList} = fabric:get_view_group_info(Db, DDoc), + send_json(Req, 200, {[ + {name, Id}, + {view_index, {GroupInfoList}} + ]}); + +handle_design_info_req(Req, _Db, _DDoc) -> + send_method_not_allowed(Req, "GET"). + +create_db_req(#httpd{}=Req, DbName) -> + couch_httpd:verify_is_server_admin(Req), + N = couch_httpd:qs_value(Req, "n", couch_config:get("cluster", "n", "3")), + Q = couch_httpd:qs_value(Req, "q", couch_config:get("cluster", "q", "8")), + DocUrl = absolute_uri(Req, "/" ++ couch_util:url_encode(DbName)), + case fabric:create_db(DbName, [{n,N}, {q,Q}]) of + ok -> + send_json(Req, 201, [{"Location", DocUrl}], {[{ok, true}]}); + accepted -> + send_json(Req, 202, [{"Location", DocUrl}], {[{ok, true}]}); + {error, file_exists} -> + chttpd:send_error(Req, file_exists); + Error -> + throw(Error) + end. + +delete_db_req(#httpd{}=Req, DbName) -> + couch_httpd:verify_is_server_admin(Req), + case fabric:delete_db(DbName, []) of + ok -> + send_json(Req, 200, {[{ok, true}]}); + accepted -> + send_json(Req, 202, {[{ok, true}]}); + Error -> + throw(Error) + end. + +do_db_req(#httpd{path_parts=[DbName|_], user_ctx=Ctx}=Req, Fun) -> + fabric:get_security(DbName, [{user_ctx,Ctx}]), % calls check_is_reader + Fun(Req, #db{name=DbName, user_ctx=Ctx}). + +db_req(#httpd{method='GET',path_parts=[DbName]}=Req, _Db) -> + % measure the time required to generate the etag, see if it's worth it + T0 = now(), + {ok, DbInfo} = fabric:get_db_info(DbName), + DeltaT = timer:now_diff(now(), T0) / 1000, + couch_stats_collector:record({couchdb, dbinfo}, DeltaT), + send_json(Req, {DbInfo}); + +db_req(#httpd{method='POST', path_parts=[DbName], user_ctx=Ctx}=Req, Db) -> + couch_httpd:validate_ctype(Req, "application/json"), + + W = couch_httpd:qs_value(Req, "w", integer_to_list(mem3:quorum(Db))), + Options = [{user_ctx,Ctx}, {w,W}], + + Doc = couch_doc:from_json_obj(couch_httpd:json_body(Req)), + Doc2 = case Doc#doc.id of + <<"">> -> + Doc#doc{id=couch_uuids:new(), revs={0, []}}; + _ -> + Doc + end, + DocId = Doc2#doc.id, + case couch_httpd:qs_value(Req, "batch") of + "ok" -> + % async_batching + spawn(fun() -> + case catch(fabric:update_doc(Db, Doc2, Options)) of + {ok, _} -> ok; + {accepted, _} -> ok; + Error -> + ?LOG_INFO("Batch doc error (~s): ~p",[DocId, Error]) + end + end), + + send_json(Req, 202, [], {[ + {ok, true}, + {id, DocId} + ]}); + _Normal -> + % normal + DocUrl = absolute_uri(Req, [$/, DbName, $/, DocId]), + case fabric:update_doc(Db, Doc2, Options) of + {ok, NewRev} -> + HttpCode = 201; + {accepted, NewRev} -> + HttpCode = 202 + end, + send_json(Req, HttpCode, [{"Location", DocUrl}], {[ + {ok, true}, + {id, DocId}, + {rev, couch_doc:rev_to_str(NewRev)} + ]}) + end; + +db_req(#httpd{path_parts=[_DbName]}=Req, _Db) -> + send_method_not_allowed(Req, "DELETE,GET,HEAD,POST"); + +db_req(#httpd{method='POST',path_parts=[_,<<"_ensure_full_commit">>]}=Req, _Db) -> + send_json(Req, 201, {[ + {ok, true}, + {instance_start_time, <<"0">>} + ]}); + +db_req(#httpd{path_parts=[_,<<"_ensure_full_commit">>]}=Req, _Db) -> + send_method_not_allowed(Req, "POST"); + +db_req(#httpd{method='POST',path_parts=[_,<<"_bulk_docs">>], user_ctx=Ctx}=Req, Db) -> + couch_stats_collector:increment({httpd, bulk_requests}), + couch_httpd:validate_ctype(Req, "application/json"), + {JsonProps} = chttpd:json_body_obj(Req), + DocsArray = couch_util:get_value(<<"docs">>, JsonProps), + W = couch_httpd:qs_value(Req, "w", integer_to_list(mem3:quorum(Db))), + case chttpd:header_value(Req, "X-Couch-Full-Commit") of + "true" -> + Options = [full_commit, {user_ctx,Ctx}, {w,W}]; + "false" -> + Options = [delay_commit, {user_ctx,Ctx}, {w,W}]; + _ -> + Options = [{user_ctx,Ctx}, {w,W}] + end, + case couch_util:get_value(<<"new_edits">>, JsonProps, true) of + true -> + Docs = lists:map( + fun({ObjProps} = JsonObj) -> + Doc = couch_doc:from_json_obj(JsonObj), + validate_attachment_names(Doc), + Id = case Doc#doc.id of + <<>> -> couch_uuids:new(); + Id0 -> Id0 + end, + case couch_util:get_value(<<"_rev">>, ObjProps) of + undefined -> + Revs = {0, []}; + Rev -> + {Pos, RevId} = couch_doc:parse_rev(Rev), + Revs = {Pos, [RevId]} + end, + Doc#doc{id=Id,revs=Revs} + end, + DocsArray), + Options2 = + case couch_util:get_value(<<"all_or_nothing">>, JsonProps) of + true -> [all_or_nothing|Options]; + _ -> Options + end, + case fabric:update_docs(Db, Docs, Options2) of + {ok, Results} -> + % output the results + DocResults = lists:zipwith(fun update_doc_result_to_json/2, + Docs, Results), + send_json(Req, 201, DocResults); + {accepted, Results} -> + % output the results + DocResults = lists:zipwith(fun update_doc_result_to_json/2, + Docs, Results), + send_json(Req, 202, DocResults); + {aborted, Errors} -> + ErrorsJson = + lists:map(fun update_doc_result_to_json/1, Errors), + send_json(Req, 417, ErrorsJson) + end; + false -> + Docs = [couch_doc:from_json_obj(JsonObj) || JsonObj <- DocsArray], + [validate_attachment_names(D) || D <- Docs], + case fabric:update_docs(Db, Docs, [replicated_changes|Options]) of + {ok, Errors} -> + ErrorsJson = lists:map(fun update_doc_result_to_json/1, Errors), + send_json(Req, 201, ErrorsJson); + {accepted, Errors} -> + ErrorsJson = lists:map(fun update_doc_result_to_json/1, Errors), + send_json(Req, 202, ErrorsJson) + end + end; + +db_req(#httpd{path_parts=[_,<<"_bulk_docs">>]}=Req, _Db) -> + send_method_not_allowed(Req, "POST"); + +db_req(#httpd{method='POST',path_parts=[_,<<"_purge">>]}=Req, Db) -> + couch_httpd:validate_ctype(Req, "application/json"), + {IdsRevs} = chttpd:json_body_obj(Req), + IdsRevs2 = [{Id, couch_doc:parse_revs(Revs)} || {Id, Revs} <- IdsRevs], + case fabric:purge_docs(Db, IdsRevs2) of + {ok, PurgeSeq, PurgedIdsRevs} -> + PurgedIdsRevs2 = [{Id, couch_doc:revs_to_strs(Revs)} || {Id, Revs} + <- PurgedIdsRevs], + send_json(Req, 200, {[ + {<<"purge_seq">>, PurgeSeq}, + {<<"purged">>, {PurgedIdsRevs2}} + ]}); + Error -> + throw(Error) + end; + +db_req(#httpd{path_parts=[_,<<"_purge">>]}=Req, _Db) -> + send_method_not_allowed(Req, "POST"); + +db_req(#httpd{method='GET',path_parts=[_,<<"_all_docs">>]}=Req, Db) -> + all_docs_view(Req, Db, nil); + +db_req(#httpd{method='POST',path_parts=[_,<<"_all_docs">>]}=Req, Db) -> + {Fields} = chttpd:json_body_obj(Req), + case couch_util:get_value(<<"keys">>, Fields, nil) of + Keys when is_list(Keys) -> + all_docs_view(Req, Db, Keys); + nil -> + all_docs_view(Req, Db, nil); + _ -> + throw({bad_request, "`keys` body member must be an array."}) + end; + +db_req(#httpd{path_parts=[_,<<"_all_docs">>]}=Req, _Db) -> + send_method_not_allowed(Req, "GET,HEAD,POST"); + +db_req(#httpd{method='POST',path_parts=[_,<<"_missing_revs">>]}=Req, Db) -> + {JsonDocIdRevs} = couch_httpd:json_body_obj(Req), + {ok, Results} = fabric:get_missing_revs(Db, JsonDocIdRevs), + Results2 = [{Id, couch_doc:revs_to_strs(Revs)} || {Id, Revs, _} <- Results], + send_json(Req, {[ + {missing_revs, {Results2}} + ]}); + +db_req(#httpd{path_parts=[_,<<"_missing_revs">>]}=Req, _Db) -> + send_method_not_allowed(Req, "POST"); + +db_req(#httpd{method='POST',path_parts=[_,<<"_revs_diff">>]}=Req, Db) -> + {JsonDocIdRevs} = couch_httpd:json_body_obj(Req), + {ok, Results} = fabric:get_missing_revs(Db, JsonDocIdRevs), + Results2 = + lists:map(fun({Id, MissingRevs, PossibleAncestors}) -> + {Id, + {[{missing, couch_doc:revs_to_strs(MissingRevs)}] ++ + if PossibleAncestors == [] -> + []; + true -> + [{possible_ancestors, + couch_doc:revs_to_strs(PossibleAncestors)}] + end}} + end, Results), + send_json(Req, {Results2}); + +db_req(#httpd{path_parts=[_,<<"_revs_diff">>]}=Req, _Db) -> + send_method_not_allowed(Req, "POST"); + +db_req(#httpd{method='PUT',path_parts=[_,<<"_security">>],user_ctx=Ctx}=Req, + Db) -> + SecObj = couch_httpd:json_body(Req), + ok = fabric:set_security(Db, SecObj, [{user_ctx,Ctx}]), + send_json(Req, {[{<<"ok">>, true}]}); + +db_req(#httpd{method='GET',path_parts=[_,<<"_security">>],user_ctx=Ctx}=Req, Db) -> + send_json(Req, fabric:get_security(Db, [{user_ctx,Ctx}])); + +db_req(#httpd{path_parts=[_,<<"_security">>]}=Req, _Db) -> + send_method_not_allowed(Req, "PUT,GET"); + +db_req(#httpd{method='PUT',path_parts=[_,<<"_revs_limit">>],user_ctx=Ctx}=Req, + Db) -> + Limit = chttpd:json_body(Req), + ok = fabric:set_revs_limit(Db, Limit, [{user_ctx,Ctx}]), + send_json(Req, {[{<<"ok">>, true}]}); + +db_req(#httpd{method='GET',path_parts=[_,<<"_revs_limit">>]}=Req, Db) -> + send_json(Req, fabric:get_revs_limit(Db)); + +db_req(#httpd{path_parts=[_,<<"_revs_limit">>]}=Req, _Db) -> + send_method_not_allowed(Req, "PUT,GET"); + +% vanilla CouchDB sends a 301 here, but we just handle the request +db_req(#httpd{path_parts=[DbName,<<"_design/",Name/binary>>|Rest]}=Req, Db) -> + db_req(Req#httpd{path_parts=[DbName, <<"_design">>, Name | Rest]}, Db); + +% Special case to enable using an unencoded slash in the URL of design docs, +% as slashes in document IDs must otherwise be URL encoded. +db_req(#httpd{path_parts=[_DbName,<<"_design">>,Name]}=Req, Db) -> + db_doc_req(Req, Db, <<"_design/",Name/binary>>); + +db_req(#httpd{path_parts=[_DbName,<<"_design">>,Name|FileNameParts]}=Req, Db) -> + db_attachment_req(Req, Db, <<"_design/",Name/binary>>, FileNameParts); + + +% Special case to allow for accessing local documents without %2F +% encoding the docid. Throws out requests that don't have the second +% path part or that specify an attachment name. +db_req(#httpd{path_parts=[_DbName, <<"_local">>]}, _Db) -> + throw({bad_request, <<"Invalid _local document id.">>}); + +db_req(#httpd{path_parts=[_DbName, <<"_local/">>]}, _Db) -> + throw({bad_request, <<"Invalid _local document id.">>}); + +db_req(#httpd{path_parts=[_DbName, <<"_local">>, Name]}=Req, Db) -> + db_doc_req(Req, Db, <<"_local/", Name/binary>>); + +db_req(#httpd{path_parts=[_DbName, <<"_local">> | _Rest]}, _Db) -> + throw({bad_request, <<"_local documents do not accept attachments.">>}); + +db_req(#httpd{path_parts=[_, DocId]}=Req, Db) -> + db_doc_req(Req, Db, DocId); + +db_req(#httpd{path_parts=[_, DocId | FileNameParts]}=Req, Db) -> + db_attachment_req(Req, Db, DocId, FileNameParts). + +all_docs_view(Req, Db, Keys) -> + % measure the time required to generate the etag, see if it's worth it + T0 = now(), + {ok, Info} = fabric:get_db_info(Db), + Etag = couch_httpd:make_etag(Info), + DeltaT = timer:now_diff(now(), T0) / 1000, + couch_stats_collector:record({couchdb, dbinfo}, DeltaT), + QueryArgs = chttpd_view:parse_view_params(Req, Keys, map), + chttpd:etag_respond(Req, Etag, fun() -> + {ok, Resp} = chttpd:start_delayed_json_response(Req, 200, [{"Etag",Etag}]), + fabric:all_docs(Db, fun all_docs_callback/2, {nil, Resp}, QueryArgs) + end). + +all_docs_callback({total_and_offset, Total, Offset}, {_, Resp}) -> + Chunk = "{\"total_rows\":~p,\"offset\":~p,\"rows\":[\r\n", + {ok, Resp1} = chttpd:send_delayed_chunk(Resp, io_lib:format(Chunk, [Total, Offset])), + {ok, {"", Resp1}}; +all_docs_callback({row, Row}, {Prepend, Resp}) -> + {ok, Resp1} = chttpd:send_delayed_chunk(Resp, [Prepend, ?JSON_ENCODE(Row)]), + {ok, {",\r\n", Resp1}}; +all_docs_callback(complete, {_, Resp}) -> + {ok, Resp1} = chttpd:send_delayed_chunk(Resp, "\r\n]}"), + chttpd:end_delayed_json_response(Resp1); +all_docs_callback({error, Reason}, {_, Resp}) -> + chttpd:send_delayed_error(Resp, Reason). + +db_doc_req(#httpd{method='DELETE'}=Req, Db, DocId) -> + % check for the existence of the doc to handle the 404 case. + couch_doc_open(Db, DocId, nil, []), + case chttpd:qs_value(Req, "rev") of + undefined -> + Body = {[{<<"_deleted">>,true}]}; + Rev -> + Body = {[{<<"_rev">>, ?l2b(Rev)},{<<"_deleted">>,true}]} + end, + update_doc(Req, Db, DocId, couch_doc_from_req(Req, DocId, Body)); + +db_doc_req(#httpd{method='GET'}=Req, Db, DocId) -> + #doc_query_args{ + rev = Rev, + open_revs = Revs, + options = Options, + atts_since = AttsSince + } = parse_doc_query(Req), + case Revs of + [] -> + Options2 = + if AttsSince /= nil -> + [{atts_since, AttsSince}, attachments | Options]; + true -> Options + end, + Doc = couch_doc_open(Db, DocId, Rev, Options2), + send_doc(Req, Doc, Options2); + _ -> + {ok, Results} = fabric:open_revs(Db, DocId, Revs, Options), + AcceptedTypes = case couch_httpd:header_value(Req, "Accept") of + undefined -> []; + AcceptHeader -> string:tokens(AcceptHeader, ", ") + end, + case lists:member("multipart/mixed", AcceptedTypes) of + false -> + {ok, Resp} = start_json_response(Req, 200), + send_chunk(Resp, "["), + % We loop through the docs. The first time through the separator + % is whitespace, then a comma on subsequent iterations. + lists:foldl( + fun(Result, AccSeparator) -> + case Result of + {ok, Doc} -> + JsonDoc = couch_doc:to_json_obj(Doc, Options), + Json = ?JSON_ENCODE({[{ok, JsonDoc}]}), + send_chunk(Resp, AccSeparator ++ Json); + {{not_found, missing}, RevId} -> + RevStr = couch_doc:rev_to_str(RevId), + Json = ?JSON_ENCODE({[{"missing", RevStr}]}), + send_chunk(Resp, AccSeparator ++ Json) + end, + "," % AccSeparator now has a comma + end, + "", Results), + send_chunk(Resp, "]"), + end_json_response(Resp); + true -> + send_docs_multipart(Req, Results, Options) + end + end; + +db_doc_req(#httpd{method='POST', user_ctx=Ctx}=Req, Db, DocId) -> + couch_httpd:validate_referer(Req), + couch_doc:validate_docid(DocId), + couch_httpd:validate_ctype(Req, "multipart/form-data"), + + W = couch_httpd:qs_value(Req, "w", integer_to_list(mem3:quorum(Db))), + Options = [{user_ctx,Ctx}, {w,W}], + + Form = couch_httpd:parse_form(Req), + case proplists:is_defined("_doc", Form) of + true -> + Json = ?JSON_DECODE(couch_util:get_value("_doc", Form)), + Doc = couch_doc_from_req(Req, DocId, Json); + false -> + Rev = couch_doc:parse_rev(list_to_binary(couch_util:get_value("_rev", Form))), + {ok, [{ok, Doc}]} = fabric:open_revs(Db, DocId, [Rev], []) + end, + UpdatedAtts = [ + #att{name=validate_attachment_name(Name), + type=list_to_binary(ContentType), + data=Content} || + {Name, {ContentType, _}, Content} <- + proplists:get_all_values("_attachments", Form) + ], + #doc{atts=OldAtts} = Doc, + OldAtts2 = lists:flatmap( + fun(#att{name=OldName}=Att) -> + case [1 || A <- UpdatedAtts, A#att.name == OldName] of + [] -> [Att]; % the attachment wasn't in the UpdatedAtts, return it + _ -> [] % the attachment was in the UpdatedAtts, drop it + end + end, OldAtts), + NewDoc = Doc#doc{ + atts = UpdatedAtts ++ OldAtts2 + }, + case fabric:update_doc(Db, NewDoc, Options) of + {ok, NewRev} -> + HttpCode = 201; + {accepted, NewRev} -> + HttpCode = 202 + end, + send_json(Req, HttpCode, [{"Etag", "\"" ++ ?b2l(couch_doc:rev_to_str(NewRev)) ++ "\""}], {[ + {ok, true}, + {id, DocId}, + {rev, couch_doc:rev_to_str(NewRev)} + ]}); + +db_doc_req(#httpd{method='PUT', user_ctx=Ctx}=Req, Db, DocId) -> + #doc_query_args{ + update_type = UpdateType + } = parse_doc_query(Req), + couch_doc:validate_docid(DocId), + + W = couch_httpd:qs_value(Req, "w", integer_to_list(mem3:quorum(Db))), + Options = [{user_ctx,Ctx}, {w,W}], + + Loc = absolute_uri(Req, [$/, Db#db.name, $/, DocId]), + RespHeaders = [{"Location", Loc}], + case couch_util:to_list(couch_httpd:header_value(Req, "Content-Type")) of + ("multipart/related;" ++ _) = ContentType -> + {ok, Doc0, WaitFun, Parser} = couch_doc:doc_from_multi_part_stream(ContentType, + fun() -> receive_request_data(Req) end), + Doc = couch_doc_from_req(Req, DocId, Doc0), + try + Result = update_doc(Req, Db, DocId, Doc, RespHeaders, UpdateType), + WaitFun(), + Result + catch throw:Err -> + % Document rejected by a validate_doc_update function. + couch_doc:abort_multi_part_stream(Parser), + throw(Err) + end; + _Else -> + case couch_httpd:qs_value(Req, "batch") of + "ok" -> + % batch + Doc = couch_doc_from_req(Req, DocId, couch_httpd:json_body(Req)), + + spawn(fun() -> + case catch(fabric:update_doc(Db, Doc, Options)) of + {ok, _} -> ok; + {accepted, _} -> ok; + Error -> + ?LOG_INFO("Batch doc error (~s): ~p",[DocId, Error]) + end + end), + send_json(Req, 202, [], {[ + {ok, true}, + {id, DocId} + ]}); + _Normal -> + % normal + Body = couch_httpd:json_body(Req), + Doc = couch_doc_from_req(Req, DocId, Body), + update_doc(Req, Db, DocId, Doc, RespHeaders, UpdateType) + end + end; + +db_doc_req(#httpd{method='COPY', user_ctx=Ctx}=Req, Db, SourceDocId) -> + SourceRev = + case extract_header_rev(Req, couch_httpd:qs_value(Req, "rev")) of + missing_rev -> nil; + Rev -> Rev + end, + {TargetDocId, TargetRevs} = parse_copy_destination_header(Req), + % open old doc + Doc = couch_doc_open(Db, SourceDocId, SourceRev, []), + % save new doc + case fabric:update_doc(Db, + Doc#doc{id=TargetDocId, revs=TargetRevs}, [{user_ctx,Ctx}]) of + {ok, NewTargetRev} -> + HttpCode = 201; + {accepted, NewTargetRev} -> + HttpCode = 202 + end, + % respond + {PartRes} = update_doc_result_to_json(TargetDocId, {ok, NewTargetRev}), + send_json(Req, HttpCode, + [{"Etag", "\"" ++ ?b2l(couch_doc:rev_to_str(NewTargetRev)) ++ "\""}], + {[{ok, true}] ++ PartRes}); + +db_doc_req(Req, _Db, _DocId) -> + send_method_not_allowed(Req, "DELETE,GET,HEAD,POST,PUT,COPY"). + +send_doc(Req, Doc, Options) -> + case Doc#doc.meta of + [] -> + DiskEtag = couch_httpd:doc_etag(Doc), + % output etag only when we have no meta + chttpd:etag_respond(Req, DiskEtag, fun() -> + send_doc_efficiently(Req, Doc, [{"Etag", DiskEtag}], Options) + end); + _ -> + send_doc_efficiently(Req, Doc, [], Options) + end. + +send_doc_efficiently(Req, #doc{atts=[]}=Doc, Headers, Options) -> + send_json(Req, 200, Headers, couch_doc:to_json_obj(Doc, Options)); +send_doc_efficiently(Req, #doc{atts=Atts}=Doc, Headers, Options) -> + case lists:member(attachments, Options) of + true -> + AcceptedTypes = case couch_httpd:header_value(Req, "Accept") of + undefined -> []; + AcceptHeader -> string:tokens(AcceptHeader, ", ") + end, + case lists:member("multipart/related", AcceptedTypes) of + false -> + send_json(Req, 200, Headers, couch_doc:to_json_obj(Doc, Options)); + true -> + Boundary = couch_uuids:random(), + JsonBytes = ?JSON_ENCODE(couch_doc:to_json_obj(Doc, + [attachments, follows|Options])), + {ContentType, Len} = couch_doc:len_doc_to_multi_part_stream( + Boundary,JsonBytes, Atts, true), + CType = {<<"Content-Type">>, ContentType}, + {ok, Resp} = start_response_length(Req, 200, [CType|Headers], Len), + couch_doc:doc_to_multi_part_stream(Boundary,JsonBytes,Atts, + fun(Data) -> couch_httpd:send(Resp, Data) end, true) + end; + false -> + send_json(Req, 200, Headers, couch_doc:to_json_obj(Doc, Options)) + end. + +send_docs_multipart(Req, Results, Options1) -> + OuterBoundary = couch_uuids:random(), + InnerBoundary = couch_uuids:random(), + Options = [attachments, follows, att_encoding_info | Options1], + CType = {"Content-Type", + "multipart/mixed; boundary=\"" ++ ?b2l(OuterBoundary) ++ "\""}, + {ok, Resp} = start_chunked_response(Req, 200, [CType]), + couch_httpd:send_chunk(Resp, <<"--", OuterBoundary/binary>>), + lists:foreach( + fun({ok, #doc{atts=Atts}=Doc}) -> + JsonBytes = ?JSON_ENCODE(couch_doc:to_json_obj(Doc, Options)), + {ContentType, _Len} = couch_doc:len_doc_to_multi_part_stream( + InnerBoundary, JsonBytes, Atts, true), + couch_httpd:send_chunk(Resp, <<"\r\nContent-Type: ", + ContentType/binary, "\r\n\r\n">>), + couch_doc:doc_to_multi_part_stream(InnerBoundary, JsonBytes, Atts, + fun(Data) -> couch_httpd:send_chunk(Resp, Data) + end, true), + couch_httpd:send_chunk(Resp, <<"\r\n--", OuterBoundary/binary>>); + ({{not_found, missing}, RevId}) -> + RevStr = couch_doc:rev_to_str(RevId), + Json = ?JSON_ENCODE({[{"missing", RevStr}]}), + couch_httpd:send_chunk(Resp, + [<<"\r\nContent-Type: application/json; error=\"true\"\r\n\r\n">>, + Json, + <<"\r\n--", OuterBoundary/binary>>]) + end, Results), + couch_httpd:send_chunk(Resp, <<"--">>), + couch_httpd:last_chunk(Resp). + +receive_request_data(Req) -> + receive_request_data(Req, chttpd:body_length(Req)). + +receive_request_data(Req, LenLeft) when LenLeft > 0 -> + Len = erlang:min(4096, LenLeft), + Data = chttpd:recv(Req, Len), + {Data, fun() -> receive_request_data(Req, LenLeft - iolist_size(Data)) end}; +receive_request_data(_Req, _) -> + throw(<<"expected more data">>). + +update_doc_result_to_json({{Id, Rev}, Error}) -> + {_Code, Err, Msg} = chttpd:error_info(Error), + {[{id, Id}, {rev, couch_doc:rev_to_str(Rev)}, + {error, Err}, {reason, Msg}]}. + +update_doc_result_to_json(#doc{id=DocId}, Result) -> + update_doc_result_to_json(DocId, Result); +update_doc_result_to_json(DocId, {ok, NewRev}) -> + {[{id, DocId}, {rev, couch_doc:rev_to_str(NewRev)}]}; +update_doc_result_to_json(DocId, {accepted, NewRev}) -> + {[{id, DocId}, {rev, couch_doc:rev_to_str(NewRev)}, {accepted, true}]}; +update_doc_result_to_json(DocId, Error) -> + {_Code, ErrorStr, Reason} = chttpd:error_info(Error), + {[{id, DocId}, {error, ErrorStr}, {reason, Reason}]}. + + +update_doc(Req, Db, DocId, Json) -> + update_doc(Req, Db, DocId, Json, []). + +update_doc(Req, Db, DocId, Doc, Headers) -> + update_doc(Req, Db, DocId, Doc, Headers, interactive_edit). + +update_doc(#httpd{user_ctx=Ctx} = Req, Db, DocId, #doc{deleted=Deleted}=Doc, + Headers, UpdateType) -> + W = couch_httpd:qs_value(Req, "w", integer_to_list(mem3:quorum(Db))), + Options = + case couch_httpd:header_value(Req, "X-Couch-Full-Commit") of + "true" -> + [full_commit, UpdateType, {user_ctx,Ctx}, {w,W}]; + "false" -> + [delay_commit, UpdateType, {user_ctx,Ctx}, {w,W}]; + _ -> + [UpdateType, {user_ctx,Ctx}, {w,W}] + end, + {_, Ref} = spawn_monitor(fun() -> exit(fabric:update_doc(Db, Doc, Options)) end), + Result = receive {'DOWN', Ref, _, _, Res} -> Res end, + case Result of + {{nocatch, Exception}, _Reason} -> + % Exceptions from spawned processes are swallowed and returned, rethrow + throw(Exception); + _ -> + ok + end, + + case Result of + {ok, NewRev} -> + Accepted = false; + {accepted, NewRev} -> + Accepted = true + end, + NewRevStr = couch_doc:rev_to_str(NewRev), + ResponseHeaders = [{"Etag", <<"\"", NewRevStr/binary, "\"">>} | Headers], + case {Accepted, Deleted} of + {true, _} -> + HttpCode = 202; + {false, true} -> + HttpCode = 200; + {false, false} -> + HttpCode = 201 + end, + send_json(Req, HttpCode, ResponseHeaders, {[ + {ok, true}, + {id, DocId}, + {rev, NewRevStr} + ]}). + +couch_doc_from_req(Req, DocId, #doc{revs=Revs} = Doc) -> + validate_attachment_names(Doc), + ExplicitDocRev = + case Revs of + {Start,[RevId|_]} -> {Start, RevId}; + _ -> undefined + end, + case extract_header_rev(Req, ExplicitDocRev) of + missing_rev -> + Revs2 = {0, []}; + ExplicitDocRev -> + Revs2 = Revs; + {Pos, Rev} -> + Revs2 = {Pos, [Rev]} + end, + Doc#doc{id=DocId, revs=Revs2}; +couch_doc_from_req(Req, DocId, Json) -> + couch_doc_from_req(Req, DocId, couch_doc:from_json_obj(Json)). + + +% Useful for debugging +% couch_doc_open(Db, DocId) -> +% couch_doc_open(Db, DocId, nil, []). + +couch_doc_open(Db, DocId, Rev, Options) -> + case Rev of + nil -> % open most recent rev + case fabric:open_doc(Db, DocId, Options) of + {ok, Doc} -> + Doc; + Error -> + throw(Error) + end; + _ -> % open a specific rev (deletions come back as stubs) + case fabric:open_revs(Db, DocId, [Rev], Options) of + {ok, [{ok, Doc}]} -> + Doc; + {ok, [{{not_found, missing}, Rev}]} -> + throw(not_found); + {ok, [Else]} -> + throw(Else) + end + end. + +% Attachment request handlers + +db_attachment_req(#httpd{method='GET',mochi_req=MochiReq}=Req, Db, DocId, FileNameParts) -> + FileName = list_to_binary(mochiweb_util:join(lists:map(fun binary_to_list/1, + FileNameParts),"/")), + #doc_query_args{ + rev=Rev, + options=Options + } = parse_doc_query(Req), + #doc{ + atts=Atts + } = Doc = couch_doc_open(Db, DocId, Rev, Options), + case [A || A <- Atts, A#att.name == FileName] of + [] -> + throw({not_found, "Document is missing attachment"}); + [#att{type=Type, encoding=Enc, disk_len=DiskLen, att_len=AttLen}=Att] -> + Etag = chttpd:doc_etag(Doc), + ReqAcceptsAttEnc = lists:member( + atom_to_list(Enc), + couch_httpd:accepted_encodings(Req) + ), + Headers = [ + {"ETag", Etag}, + {"Cache-Control", "must-revalidate"}, + {"Content-Type", binary_to_list(Type)} + ] ++ case ReqAcceptsAttEnc of + true when Enc =/= identity -> + % RFC 2616 says that the 'identify' encoding should not be used in + % the Content-Encoding header + [{"Content-Encoding", atom_to_list(Enc)}]; + _ -> + [] + end ++ case Enc of + identity -> + [{"Accept-Ranges", "bytes"}]; + _ -> + [{"Accept-Ranges", "none"}] + end, + Len = case {Enc, ReqAcceptsAttEnc} of + {identity, _} -> + % stored and served in identity form + DiskLen; + {_, false} when DiskLen =/= AttLen -> + % Stored encoded, but client doesn't accept the encoding we used, + % so we need to decode on the fly. DiskLen is the identity length + % of the attachment. + DiskLen; + {_, true} -> + % Stored and served encoded. AttLen is the encoded length. + AttLen; + _ -> + % We received an encoded attachment and stored it as such, so we + % don't know the identity length. The client doesn't accept the + % encoding, and since we cannot serve a correct Content-Length + % header we'll fall back to a chunked response. + undefined + end, + AttFun = case ReqAcceptsAttEnc of + false -> + fun couch_doc:att_foldl_decode/3; + true -> + fun couch_doc:att_foldl/3 + end, + chttpd:etag_respond( + Req, + Etag, + fun() -> + case Len of + undefined -> + {ok, Resp} = start_chunked_response(Req, 200, Headers), + AttFun(Att, fun(Seg, _) -> send_chunk(Resp, Seg) end, {ok, Resp}), + couch_httpd:last_chunk(Resp); + _ -> + Ranges = parse_ranges(MochiReq:get(range), Len), + case {Enc, Ranges} of + {identity, [{From, To}]} -> + Headers1 = [{<<"Content-Range">>, make_content_range(From, To, Len)}] + ++ Headers, + {ok, Resp} = start_response_length(Req, 206, Headers1, To - From + 1), + couch_doc:range_att_foldl(Att, From, To + 1, + fun(Seg, _) -> send(Resp, Seg) end, {ok, Resp}); + {identity, Ranges} when is_list(Ranges) -> + send_ranges_multipart(Req, Type, Len, Att, Ranges); + _ -> + Headers1 = Headers ++ + if Enc =:= identity orelse ReqAcceptsAttEnc =:= true -> + [{"Content-MD5", base64:encode(Att#att.md5)}]; + true -> + [] + end, + {ok, Resp} = start_response_length(Req, 200, Headers1, Len), + AttFun(Att, fun(Seg, _) -> send(Resp, Seg) end, {ok, Resp}) + end + end + end + ) + end; + + +db_attachment_req(#httpd{method=Method, user_ctx=Ctx}=Req, Db, DocId, FileNameParts) + when (Method == 'PUT') or (Method == 'DELETE') -> + FileName = validate_attachment_name( + mochiweb_util:join( + lists:map(fun binary_to_list/1, + FileNameParts),"/")), + + NewAtt = case Method of + 'DELETE' -> + []; + _ -> + [#att{ + name=FileName, + type = case couch_httpd:header_value(Req,"Content-Type") of + undefined -> + % We could throw an error here or guess by the FileName. + % Currently, just giving it a default. + <<"application/octet-stream">>; + CType -> + list_to_binary(CType) + end, + data = fabric:att_receiver(Req, chttpd:body_length(Req)), + att_len = case couch_httpd:header_value(Req,"Content-Length") of + undefined -> + undefined; + Length -> + list_to_integer(Length) + end, + md5 = get_md5_header(Req), + encoding = case string:to_lower(string:strip( + couch_httpd:header_value(Req,"Content-Encoding","identity") + )) of + "identity" -> + identity; + "gzip" -> + gzip; + _ -> + throw({ + bad_ctype, + "Only gzip and identity content-encodings are supported" + }) + end + }] + end, + + Doc = case extract_header_rev(Req, couch_httpd:qs_value(Req, "rev")) of + missing_rev -> % make the new doc + couch_doc:validate_docid(DocId), + #doc{id=DocId}; + Rev -> + case fabric:open_revs(Db, DocId, [Rev], []) of + {ok, [{ok, Doc0}]} -> Doc0; + {ok, [Error]} -> throw(Error) + end + end, + + #doc{atts=Atts, revs = {Pos, Revs}} = Doc, + DocEdited = Doc#doc{ + % prune revision list as a workaround for key tree bug (COUCHDB-902) + revs = {Pos, case Revs of [] -> []; [Hd|_] -> [Hd] end}, + atts = NewAtt ++ [A || A <- Atts, A#att.name /= FileName] + }, + case fabric:update_doc(Db, DocEdited, [{user_ctx,Ctx}]) of + {ok, UpdatedRev} -> + HttpCode = 201; + {accepted, UpdatedRev} -> + HttpCode = 202 + end, + erlang:put(mochiweb_request_recv, true), + #db{name=DbName} = Db, + + {Status, Headers} = case Method of + 'DELETE' -> + {200, []}; + _ -> + {HttpCode, [{"Location", absolute_uri(Req, [$/, DbName, $/, DocId, $/, + FileName])}]} + end, + send_json(Req,Status, Headers, {[ + {ok, true}, + {id, DocId}, + {rev, couch_doc:rev_to_str(UpdatedRev)} + ]}); + +db_attachment_req(Req, _Db, _DocId, _FileNameParts) -> + send_method_not_allowed(Req, "DELETE,GET,HEAD,PUT"). + +send_ranges_multipart(Req, ContentType, Len, Att, Ranges) -> + Boundary = couch_uuids:random(), + CType = {"Content-Type", + "multipart/byteranges; boundary=\"" ++ ?b2l(Boundary) ++ "\""}, + {ok, Resp} = start_chunked_response(Req, 206, [CType]), + couch_httpd:send_chunk(Resp, <<"--", Boundary/binary>>), + lists:foreach(fun({From, To}) -> + ContentRange = make_content_range(From, To, Len), + couch_httpd:send_chunk(Resp, + <<"\r\nContent-Type: ", ContentType/binary, "\r\n", + "Content-Range: ", ContentRange/binary, "\r\n", + "\r\n">>), + couch_doc:range_att_foldl(Att, From, To + 1, + fun(Seg, _) -> send_chunk(Resp, Seg) end, {ok, Resp}), + couch_httpd:send_chunk(Resp, <<"\r\n--", Boundary/binary>>) + end, Ranges), + couch_httpd:send_chunk(Resp, <<"--">>), + couch_httpd:last_chunk(Resp), + {ok, Resp}. + +parse_ranges(undefined, _Len) -> + undefined; +parse_ranges(fail, _Len) -> + undefined; +parse_ranges(Ranges, Len) -> + parse_ranges(Ranges, Len, []). + +parse_ranges([], _Len, Acc) -> + lists:reverse(Acc); +parse_ranges([{From, To}|_], _Len, _Acc) + when is_integer(From) andalso is_integer(To) andalso To < From -> + throw(requested_range_not_satisfiable); +parse_ranges([{From, To}|Rest], Len, Acc) + when is_integer(To) andalso To >= Len -> + parse_ranges([{From, Len-1}] ++ Rest, Len, Acc); +parse_ranges([{none, To}|Rest], Len, Acc) -> + parse_ranges([{Len - To, Len - 1}] ++ Rest, Len, Acc); +parse_ranges([{From, none}|Rest], Len, Acc) -> + parse_ranges([{From, Len - 1}] ++ Rest, Len, Acc); +parse_ranges([{From,To}|Rest], Len, Acc) -> + parse_ranges(Rest, Len, [{From, To}] ++ Acc). + +make_content_range(From, To, Len) -> + ?l2b(io_lib:format("bytes ~B-~B/~B", [From, To, Len])). + +get_md5_header(Req) -> + ContentMD5 = couch_httpd:header_value(Req, "Content-MD5"), + Length = couch_httpd:body_length(Req), + Trailer = couch_httpd:header_value(Req, "Trailer"), + case {ContentMD5, Length, Trailer} of + _ when is_list(ContentMD5) orelse is_binary(ContentMD5) -> + base64:decode(ContentMD5); + {_, chunked, undefined} -> + <<>>; + {_, chunked, _} -> + case re:run(Trailer, "\\bContent-MD5\\b", [caseless]) of + {match, _} -> + md5_in_footer; + _ -> + <<>> + end; + _ -> + <<>> + end. + +parse_doc_query(Req) -> + lists:foldl(fun({Key,Value}, Args) -> + case {Key, Value} of + {"attachments", "true"} -> + Options = [attachments | Args#doc_query_args.options], + Args#doc_query_args{options=Options}; + {"meta", "true"} -> + Options = [revs_info, conflicts, deleted_conflicts | Args#doc_query_args.options], + Args#doc_query_args{options=Options}; + {"revs", "true"} -> + Options = [revs | Args#doc_query_args.options], + Args#doc_query_args{options=Options}; + {"local_seq", "true"} -> + Options = [local_seq | Args#doc_query_args.options], + Args#doc_query_args{options=Options}; + {"revs_info", "true"} -> + Options = [revs_info | Args#doc_query_args.options], + Args#doc_query_args{options=Options}; + {"conflicts", "true"} -> + Options = [conflicts | Args#doc_query_args.options], + Args#doc_query_args{options=Options}; + {"deleted_conflicts", "true"} -> + Options = [deleted_conflicts | Args#doc_query_args.options], + Args#doc_query_args{options=Options}; + {"rev", Rev} -> + Args#doc_query_args{rev=couch_doc:parse_rev(Rev)}; + {"open_revs", "all"} -> + Args#doc_query_args{open_revs=all}; + {"open_revs", RevsJsonStr} -> + JsonArray = ?JSON_DECODE(RevsJsonStr), + Args#doc_query_args{open_revs=[couch_doc:parse_rev(Rev) || Rev <- JsonArray]}; + {"atts_since", RevsJsonStr} -> + JsonArray = ?JSON_DECODE(RevsJsonStr), + Args#doc_query_args{atts_since = couch_doc:parse_revs(JsonArray)}; + {"new_edits", "false"} -> + Args#doc_query_args{update_type=replicated_changes}; + {"new_edits", "true"} -> + Args#doc_query_args{update_type=interactive_edit}; + {"att_encoding_info", "true"} -> + Options = [att_encoding_info | Args#doc_query_args.options], + Args#doc_query_args{options=Options}; + {"r", R} -> + Options = [{r,R} | Args#doc_query_args.options], + Args#doc_query_args{options=Options}; + {"w", W} -> + Options = [{w,W} | Args#doc_query_args.options], + Args#doc_query_args{options=Options}; + _Else -> % unknown key value pair, ignore. + Args + end + end, #doc_query_args{}, chttpd:qs(Req)). + +parse_changes_query(Req) -> + lists:foldl(fun({Key, Value}, Args) -> + case {Key, Value} of + {"feed", _} -> + Args#changes_args{feed=Value}; + {"descending", "true"} -> + Args#changes_args{dir=rev}; + {"since", _} -> + Args#changes_args{since=Value}; + {"limit", _} -> + Args#changes_args{limit=list_to_integer(Value)}; + {"style", _} -> + Args#changes_args{style=list_to_existing_atom(Value)}; + {"heartbeat", "true"} -> + Args#changes_args{heartbeat=true}; + {"heartbeat", _} -> + Args#changes_args{heartbeat=list_to_integer(Value)}; + {"timeout", _} -> + Args#changes_args{timeout=list_to_integer(Value)}; + {"include_docs", "true"} -> + Args#changes_args{include_docs=true}; + {"conflicts", "true"} -> + Args#changes_args{conflicts=true}; + {"filter", _} -> + Args#changes_args{filter=Value}; + _Else -> % unknown key value pair, ignore. + Args + end + end, #changes_args{}, couch_httpd:qs(Req)). + +extract_header_rev(Req, ExplicitRev) when is_binary(ExplicitRev) or is_list(ExplicitRev)-> + extract_header_rev(Req, couch_doc:parse_rev(ExplicitRev)); +extract_header_rev(Req, ExplicitRev) -> + Etag = case chttpd:header_value(Req, "If-Match") of + undefined -> undefined; + Value -> couch_doc:parse_rev(string:strip(Value, both, $")) + end, + case {ExplicitRev, Etag} of + {undefined, undefined} -> missing_rev; + {_, undefined} -> ExplicitRev; + {undefined, _} -> Etag; + _ when ExplicitRev == Etag -> Etag; + _ -> + throw({bad_request, "Document rev and etag have different values"}) + end. + + +parse_copy_destination_header(Req) -> + Destination = chttpd:header_value(Req, "Destination"), + case re:run(Destination, "\\?", [{capture, none}]) of + nomatch -> + {list_to_binary(Destination), {0, []}}; + match -> + [DocId, RevQs] = re:split(Destination, "\\?", [{return, list}]), + [_RevQueryKey, Rev] = re:split(RevQs, "=", [{return, list}]), + {Pos, RevId} = couch_doc:parse_rev(Rev), + {list_to_binary(DocId), {Pos, [RevId]}} + end. + +validate_attachment_names(Doc) -> + lists:foreach(fun(#att{name=Name}) -> + validate_attachment_name(Name) + end, Doc#doc.atts). + +validate_attachment_name(Name) when is_list(Name) -> + validate_attachment_name(list_to_binary(Name)); +validate_attachment_name(<<"_",_/binary>>) -> + throw({bad_request, <<"Attachment name can't start with '_'">>}); +validate_attachment_name(Name) -> + case is_valid_utf8(Name) of + true -> Name; + false -> throw({bad_request, <<"Attachment name is not UTF-8 encoded">>}) + end. + +%% borrowed from mochijson2:json_bin_is_safe() +is_valid_utf8(<<>>) -> + true; +is_valid_utf8(<<C, Rest/binary>>) -> + case C of + $\" -> + false; + $\\ -> + false; + $\b -> + false; + $\f -> + false; + $\n -> + false; + $\r -> + false; + $\t -> + false; + C when C >= 0, C < $\s; C >= 16#7f, C =< 16#10FFFF -> + false; + C when C < 16#7f -> + is_valid_utf8(Rest); + _ -> + false + end. |