| % 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(couch_doc). |
| |
| -export([to_doc_info/1, to_doc_info_path/1, parse_rev/1, parse_revs/1, rev_to_str/1, revs_to_strs/1]). |
| -export([from_json_obj/1, from_json_obj_validate/1]). |
| -export([from_json_obj/2, from_json_obj_validate/2]). |
| -export([to_json_obj/2, has_stubs/1, merge_stubs/2]). |
| -export([get_validate_doc_fun/1]). |
| -export([doc_from_multi_part_stream/2, doc_from_multi_part_stream/3]). |
| -export([doc_from_multi_part_stream/4]). |
| -export([doc_to_multi_part_stream/5, len_doc_to_multi_part_stream/4]). |
| -export([restart_open_doc_revs/3]). |
| -export([to_path/1]). |
| |
| -export([is_deleted/1]). |
| |
| -include_lib("couch/include/couch_db.hrl"). |
| |
| -spec to_path(#doc{}) -> path(). |
| to_path(#doc{revs = {Start, RevIds}} = Doc) -> |
| [Branch] = to_branch(Doc, lists:reverse(RevIds)), |
| {Start - length(RevIds) + 1, Branch}. |
| |
| -spec to_branch(#doc{}, [RevId :: binary()]) -> [branch()]. |
| to_branch(Doc, [RevId]) -> |
| [{RevId, Doc, []}]; |
| to_branch(Doc, [RevId | Rest]) -> |
| [{RevId, ?REV_MISSING, to_branch(Doc, Rest)}]. |
| |
| % helpers used by to_json_obj |
| to_json_rev(0, []) -> |
| []; |
| to_json_rev(Start, [FirstRevId | _]) -> |
| [{<<"_rev">>, ?l2b([integer_to_list(Start), "-", revid_to_str(FirstRevId)])}]. |
| |
| to_json_body(true, {Body}) -> |
| Body ++ [{<<"_deleted">>, true}]; |
| to_json_body(false, {Body}) -> |
| Body. |
| |
| to_json_revisions(Options, Start, RevIds0) -> |
| RevIds = |
| case proplists:get_value(revs, Options) of |
| true -> |
| RevIds0; |
| Num when is_integer(Num), Num > 0 -> |
| lists:sublist(RevIds0, Num); |
| _ -> |
| [] |
| end, |
| if |
| RevIds == [] -> |
| []; |
| true -> |
| [ |
| {<<"_revisions">>, |
| {[ |
| {<<"start">>, Start}, |
| {<<"ids">>, [revid_to_str(R) || R <- RevIds]} |
| ]}} |
| ] |
| end. |
| |
| revid_to_str(RevId) when size(RevId) =:= 16 -> |
| ?l2b(couch_util:to_hex(RevId)); |
| revid_to_str(RevId) -> |
| RevId. |
| |
| rev_to_str({Pos, RevId}) -> |
| ?l2b([integer_to_list(Pos), "-", revid_to_str(RevId)]). |
| |
| revs_to_strs([]) -> |
| []; |
| revs_to_strs([{Pos, RevId} | Rest]) -> |
| [rev_to_str({Pos, RevId}) | revs_to_strs(Rest)]. |
| |
| to_json_meta(Meta) -> |
| lists:flatmap( |
| fun |
| ({revs_info, Start, RevsInfo}) -> |
| {JsonRevsInfo, _Pos} = lists:mapfoldl( |
| fun({RevId, Status}, PosAcc) -> |
| JsonObj = |
| {[ |
| {<<"rev">>, rev_to_str({PosAcc, RevId})}, |
| {<<"status">>, ?l2b(atom_to_list(Status))} |
| ]}, |
| {JsonObj, PosAcc - 1} |
| end, |
| Start, |
| RevsInfo |
| ), |
| [{<<"_revs_info">>, JsonRevsInfo}]; |
| ({local_seq, Seq}) -> |
| [{<<"_local_seq">>, Seq}]; |
| ({conflicts, Conflicts}) -> |
| [{<<"_conflicts">>, revs_to_strs(Conflicts)}]; |
| ({deleted_conflicts, DConflicts}) -> |
| [{<<"_deleted_conflicts">>, revs_to_strs(DConflicts)}]; |
| (_) -> |
| [] |
| end, |
| Meta |
| ). |
| |
| to_json_attachments(Attachments, Options) -> |
| to_json_attachments( |
| Attachments, |
| lists:member(attachments, Options), |
| lists:member(follows, Options), |
| lists:member(att_encoding_info, Options) |
| ). |
| |
| to_json_attachments([], _OutputData, _Follows, _ShowEnc) -> |
| []; |
| to_json_attachments(Atts, OutputData, Follows, ShowEnc) -> |
| Props = [couch_att:to_json(A, OutputData, Follows, ShowEnc) || A <- Atts], |
| [{<<"_attachments">>, {Props}}]. |
| |
| to_json_obj(Doc, Options) -> |
| doc_to_json_obj(Doc, Options). |
| |
| doc_to_json_obj( |
| #doc{ |
| id = Id, |
| deleted = Del, |
| body = Body, |
| revs = {Start, RevIds}, |
| meta = Meta |
| } = Doc, |
| Options |
| ) -> |
| { |
| [{<<"_id">>, Id}] ++ |
| to_json_rev(Start, RevIds) ++ |
| to_json_body(Del, Body) ++ |
| to_json_revisions(Options, Start, RevIds) ++ |
| to_json_meta(Meta) ++ |
| to_json_attachments(Doc#doc.atts, Options) |
| }. |
| |
| from_json_obj_validate(EJson) -> |
| from_json_obj_validate(EJson, undefined). |
| |
| from_json_obj_validate(EJson, DbName) -> |
| MaxSize = config:get_integer("couchdb", "max_document_size", 4294967296), |
| Doc = from_json_obj(EJson, DbName), |
| case couch_ejson_size:encoded_size(Doc#doc.body) =< MaxSize of |
| true -> |
| validate_attachment_sizes(Doc#doc.atts), |
| Doc; |
| false -> |
| throw({request_entity_too_large, Doc#doc.id}) |
| end. |
| |
| validate_attachment_sizes([]) -> |
| ok; |
| validate_attachment_sizes(Atts) -> |
| MaxAttSize = couch_att:max_attachment_size(), |
| lists:foreach( |
| fun(Att) -> |
| AttName = couch_att:fetch(name, Att), |
| AttSize = couch_att:fetch(att_len, Att), |
| couch_att:validate_attachment_size(AttName, AttSize, MaxAttSize) |
| end, |
| Atts |
| ). |
| |
| from_json_obj({Props}) -> |
| from_json_obj({Props}, undefined). |
| |
| from_json_obj({Props}, DbName) -> |
| transfer_fields(Props, #doc{body = []}, DbName); |
| from_json_obj(_Other, _) -> |
| throw({bad_request, "Document must be a JSON object"}). |
| |
| parse_revid(RevId) when size(RevId) =:= 32 -> |
| RevInt = erlang:list_to_integer(?b2l(RevId), 16), |
| <<RevInt:128>>; |
| parse_revid(RevId) when length(RevId) =:= 32 -> |
| RevInt = erlang:list_to_integer(RevId, 16), |
| <<RevInt:128>>; |
| parse_revid(RevId) when is_binary(RevId) -> |
| RevId; |
| parse_revid(RevId) when is_list(RevId) -> |
| ?l2b(RevId). |
| |
| parse_rev(Rev) when is_binary(Rev) -> |
| parse_rev(?b2l(Rev)); |
| parse_rev(Rev) when is_list(Rev) -> |
| SplitRev = lists:splitwith( |
| fun |
| ($-) -> false; |
| (_) -> true |
| end, |
| Rev |
| ), |
| case SplitRev of |
| {Pos, [$- | RevId]} -> |
| try |
| IntPos = list_to_integer(Pos), |
| {IntPos, parse_revid(RevId)} |
| catch |
| error:badarg -> throw({bad_request, <<"Invalid rev format">>}) |
| end; |
| _Else -> |
| throw({bad_request, <<"Invalid rev format">>}) |
| end; |
| parse_rev(_BadRev) -> |
| throw({bad_request, <<"Invalid rev format">>}). |
| |
| parse_revs([]) -> |
| []; |
| parse_revs([Rev | Rest]) -> |
| [parse_rev(Rev) | parse_revs(Rest)]; |
| parse_revs(_) -> |
| throw({bad_request, "Invalid list of revisions"}). |
| |
| transfer_fields([], #doc{body = Fields} = Doc, _) -> |
| % convert fields back to json object |
| Doc#doc{body = {lists:reverse(Fields)}}; |
| transfer_fields([{<<"_id">>, Id} | Rest], Doc, DbName) -> |
| fabric2_db:validate_docid(Id), |
| transfer_fields(Rest, Doc#doc{id = Id}, DbName); |
| transfer_fields([{<<"_rev">>, Rev} | Rest], #doc{revs = {0, []}} = Doc, DbName) -> |
| {Pos, RevId} = parse_rev(Rev), |
| transfer_fields( |
| Rest, |
| Doc#doc{revs = {Pos, [RevId]}}, |
| DbName |
| ); |
| transfer_fields([{<<"_rev">>, _Rev} | Rest], Doc, DbName) -> |
| % we already got the rev from the _revisions |
| transfer_fields(Rest, Doc, DbName); |
| transfer_fields([{<<"_attachments">>, {JsonBins}} | Rest], Doc, DbName) -> |
| Atts = [couch_att:from_json(Name, Props) || {Name, {Props}} <- JsonBins], |
| transfer_fields(Rest, Doc#doc{atts = Atts}, DbName); |
| transfer_fields([{<<"_revisions">>, {Props}} | Rest], Doc, DbName) -> |
| RevIds = couch_util:get_value(<<"ids">>, Props), |
| Start = couch_util:get_value(<<"start">>, Props), |
| if |
| not is_integer(Start) -> |
| throw({doc_validation, "_revisions.start isn't an integer."}); |
| not is_list(RevIds) -> |
| throw({doc_validation, "_revisions.ids isn't a array."}); |
| true -> |
| ok |
| end, |
| RevIds2 = lists:map( |
| fun(RevId) -> |
| try |
| parse_revid(RevId) |
| catch |
| error:function_clause -> |
| throw({doc_validation, "RevId isn't a string"}); |
| error:badarg -> |
| throw({doc_validation, "RevId isn't a valid hexadecimal"}) |
| end |
| end, |
| RevIds |
| ), |
| transfer_fields(Rest, Doc#doc{revs = {Start, RevIds2}}, DbName); |
| transfer_fields([{<<"_deleted">>, B} | Rest], Doc, DbName) when is_boolean(B) -> |
| transfer_fields(Rest, Doc#doc{deleted = B}, DbName); |
| % ignored fields |
| transfer_fields([{<<"_revs_info">>, _} | Rest], Doc, DbName) -> |
| transfer_fields(Rest, Doc, DbName); |
| transfer_fields([{<<"_local_seq">>, _} | Rest], Doc, DbName) -> |
| transfer_fields(Rest, Doc, DbName); |
| transfer_fields([{<<"_conflicts">>, _} | Rest], Doc, DbName) -> |
| transfer_fields(Rest, Doc, DbName); |
| transfer_fields([{<<"_deleted_conflicts">>, _} | Rest], Doc, DbName) -> |
| transfer_fields(Rest, Doc, DbName); |
| % special field for per doc access control, for future compatibility |
| transfer_fields( |
| [{<<"_access">>, _} = Field | Rest], |
| #doc{body = Fields} = Doc, |
| DbName |
| ) -> |
| transfer_fields(Rest, Doc#doc{body = [Field | Fields]}, DbName); |
| % special fields for replication documents |
| transfer_fields( |
| [{<<"_replication_state">>, _} = Field | Rest], |
| #doc{body = Fields} = Doc, |
| DbName |
| ) -> |
| transfer_fields(Rest, Doc#doc{body = [Field | Fields]}, DbName); |
| transfer_fields( |
| [{<<"_replication_state_time">>, _} = Field | Rest], |
| #doc{body = Fields} = Doc, |
| DbName |
| ) -> |
| transfer_fields(Rest, Doc#doc{body = [Field | Fields]}, DbName); |
| transfer_fields( |
| [{<<"_replication_state_reason">>, _} = Field | Rest], |
| #doc{body = Fields} = Doc, |
| DbName |
| ) -> |
| transfer_fields(Rest, Doc#doc{body = [Field | Fields]}, DbName); |
| transfer_fields( |
| [{<<"_replication_id">>, _} = Field | Rest], |
| #doc{body = Fields} = Doc, |
| DbName |
| ) -> |
| transfer_fields(Rest, Doc#doc{body = [Field | Fields]}, DbName); |
| transfer_fields( |
| [{<<"_replication_stats">>, _} = Field | Rest], |
| #doc{body = Fields} = Doc, |
| DbName |
| ) -> |
| transfer_fields(Rest, Doc#doc{body = [Field | Fields]}, DbName); |
| % unknown special field |
| transfer_fields([{<<"_", Name/binary>>, _} | _], _, _) -> |
| throw({doc_validation, ?l2b(io_lib:format("Bad special document member: _~s", [Name]))}); |
| transfer_fields([Field | Rest], #doc{body = Fields} = Doc, DbName) -> |
| transfer_fields(Rest, Doc#doc{body = [Field | Fields]}, DbName). |
| |
| to_doc_info(FullDocInfo) -> |
| {DocInfo, _Path} = to_doc_info_path(FullDocInfo), |
| DocInfo. |
| |
| max_seq(Tree, UpdateSeq) -> |
| FoldFun = fun({_Pos, _Key}, Value, _Type, MaxOldSeq) -> |
| case Value of |
| {_Deleted, _DiskPos, OldTreeSeq} -> |
| % Older versions didn't track data sizes. |
| erlang:max(MaxOldSeq, OldTreeSeq); |
| % necessary clause? |
| {_Deleted, _DiskPos, OldTreeSeq, _Size} -> |
| % Older versions didn't store #leaf records. |
| erlang:max(MaxOldSeq, OldTreeSeq); |
| #leaf{seq = OldTreeSeq} -> |
| erlang:max(MaxOldSeq, OldTreeSeq); |
| _ -> |
| MaxOldSeq |
| end |
| end, |
| couch_key_tree:fold(FoldFun, UpdateSeq, Tree). |
| |
| to_doc_info_path(#full_doc_info{id = Id, rev_tree = Tree, update_seq = FDISeq}) -> |
| RevInfosAndPath = [ |
| {rev_info(Node), Path} |
| || {_Leaf, Path} = Node <- |
| couch_key_tree:get_all_leafs(Tree) |
| ], |
| SortedRevInfosAndPath = lists:sort( |
| fun( |
| {#rev_info{deleted = DeletedA, rev = RevA}, _PathA}, |
| {#rev_info{deleted = DeletedB, rev = RevB}, _PathB} |
| ) -> |
| % sort descending by {not deleted, rev} |
| {not DeletedA, RevA} > {not DeletedB, RevB} |
| end, |
| RevInfosAndPath |
| ), |
| [{_RevInfo, WinPath} | _] = SortedRevInfosAndPath, |
| RevInfos = [RevInfo || {RevInfo, _Path} <- SortedRevInfosAndPath], |
| {#doc_info{id = Id, high_seq = max_seq(Tree, FDISeq), revs = RevInfos}, WinPath}. |
| |
| rev_info({#leaf{} = Leaf, {Pos, [RevId | _]}}) -> |
| #rev_info{ |
| deleted = Leaf#leaf.deleted, |
| body_sp = Leaf#leaf.ptr, |
| seq = Leaf#leaf.seq, |
| rev = {Pos, RevId} |
| }; |
| rev_info({#doc{} = Doc, {Pos, [RevId | _]}}) -> |
| #rev_info{ |
| deleted = Doc#doc.deleted, |
| body_sp = undefined, |
| seq = undefined, |
| rev = {Pos, RevId} |
| }; |
| rev_info({#{} = RevInfo, {Pos, [RevId | _]}}) -> |
| #{ |
| deleted := Deleted, |
| sequence := Sequence |
| } = RevInfo, |
| #rev_info{ |
| deleted = Deleted, |
| body_sp = undefined, |
| seq = fabric2_fdb:vs_to_seq(Sequence), |
| rev = {Pos, RevId} |
| }. |
| |
| is_deleted(#full_doc_info{rev_tree = Tree}) -> |
| is_deleted(Tree); |
| is_deleted(Tree) -> |
| Leafs = couch_key_tree:get_all_leafs(Tree), |
| try |
| lists:foldl( |
| fun |
| ({#leaf{deleted = false}, _}, _) -> |
| throw(not_deleted); |
| ({#doc{deleted = false}, _}, _) -> |
| throw(not_deleted); |
| (_, Acc) -> |
| Acc |
| end, |
| nil, |
| Leafs |
| ), |
| true |
| catch |
| throw:not_deleted -> |
| false |
| end. |
| |
| get_validate_doc_fun({Props}) -> |
| get_validate_doc_fun(couch_doc:from_json_obj({Props})); |
| get_validate_doc_fun(#doc{body = {Props}} = DDoc) -> |
| case couch_util:get_value(<<"validate_doc_update">>, Props) of |
| undefined -> |
| nil; |
| _Else -> |
| fun(EditDoc, DiskDoc, Ctx, SecObj) -> |
| couch_query_servers:validate_doc_update(DDoc, EditDoc, DiskDoc, Ctx, SecObj) |
| end |
| end. |
| |
| has_stubs(#doc{atts = Atts}) -> |
| lists:any(fun couch_att:is_stub/1, Atts); |
| has_stubs(Atts) -> |
| lists:any(fun couch_att:is_stub/1, Atts). |
| |
| merge_stubs(#doc{id = Id}, nil) -> |
| throw({missing_stub, <<"Previous revision missing for document ", Id/binary>>}); |
| merge_stubs(#doc{id = Id, atts = MemBins} = StubsDoc, #doc{atts = DiskBins}) -> |
| case couch_att:merge_stubs(MemBins, DiskBins) of |
| {ok, MergedBins} -> |
| StubsDoc#doc{atts = MergedBins}; |
| {missing, Name} -> |
| throw( |
| {missing_stub, <<"Invalid attachment stub in ", Id/binary, " for ", Name/binary>>} |
| ) |
| end. |
| |
| len_doc_to_multi_part_stream(Boundary, JsonBytes, Atts, SendEncodedAtts) -> |
| AttsToInclude = lists:filter(fun(Att) -> not couch_att:is_stub(Att) end, Atts), |
| AttsDecoded = decode_attributes(AttsToInclude, SendEncodedAtts), |
| couch_httpd_multipart:length_multipart_stream(Boundary, JsonBytes, AttsDecoded). |
| |
| doc_to_multi_part_stream( |
| Boundary, |
| JsonBytes, |
| Atts, |
| WriteFun, |
| SendEncodedAtts |
| ) -> |
| AttsToInclude = lists:filter(fun(Att) -> couch_att:fetch(data, Att) /= stub end, Atts), |
| AttsDecoded = decode_attributes(AttsToInclude, SendEncodedAtts), |
| AttFun = |
| case SendEncodedAtts of |
| false -> fun couch_att:foldl_decode/3; |
| true -> fun couch_att:foldl/3 |
| end, |
| couch_httpd_multipart:encode_multipart_stream( |
| Boundary, JsonBytes, AttsDecoded, WriteFun, AttFun |
| ). |
| |
| decode_attributes(Atts, SendEncodedAtts) -> |
| lists:map( |
| fun(Att) -> |
| [Name, AttLen, DiskLen, Type, Encoding] = |
| couch_att:fetch([name, att_len, disk_len, type, encoding], Att), |
| Len = |
| case SendEncodedAtts of |
| true -> AttLen; |
| false -> DiskLen |
| end, |
| {Att, Name, Len, Type, Encoding} |
| end, |
| Atts |
| ). |
| |
| doc_from_multi_part_stream(ContentType, DataFun) -> |
| doc_from_multi_part_stream(ContentType, DataFun, make_ref()). |
| |
| doc_from_multi_part_stream(ContentType, DataFun, Ref) -> |
| doc_from_multi_part_stream(ContentType, DataFun, Ref, true). |
| |
| doc_from_multi_part_stream(ContentType, DataFun, Ref, ValidateDocLimits) -> |
| case couch_httpd_multipart:decode_multipart_stream(ContentType, DataFun, Ref) of |
| {{started_open_doc_revs, NewRef}, Parser, _ParserRef} -> |
| restart_open_doc_revs(Parser, Ref, NewRef); |
| {{doc_bytes, Ref, DocBytes}, Parser, ParserRef} -> |
| Doc = |
| case ValidateDocLimits of |
| true -> |
| from_json_obj_validate(?JSON_DECODE(DocBytes)); |
| false -> |
| from_json_obj(?JSON_DECODE(DocBytes)) |
| end, |
| erlang:put(mochiweb_request_recv, true), |
| % we'll send the Parser process ID to the remote nodes so they can |
| % retrieve their own copies of the attachment data |
| WithParser = fun |
| (follows) -> {follows, Parser, Ref}; |
| (D) -> D |
| end, |
| Atts = [couch_att:transform(data, WithParser, A) || A <- Doc#doc.atts], |
| WaitFun = fun() -> |
| receive |
| {'DOWN', ParserRef, _, _, _} -> ok |
| end |
| end, |
| {ok, Doc#doc{atts = Atts}, WaitFun, Parser}; |
| ok -> |
| ok |
| end. |
| |
| restart_open_doc_revs(Parser, Ref, NewRef) -> |
| unlink(Parser), |
| exit(Parser, kill), |
| flush_parser_messages(Ref), |
| erlang:error({restart_open_doc_revs, NewRef}). |
| |
| flush_parser_messages(Ref) -> |
| receive |
| {headers, Ref, _} -> |
| flush_parser_messages(Ref); |
| {body_bytes, Ref, _} -> |
| flush_parser_messages(Ref); |
| {body_done, Ref} -> |
| flush_parser_messages(Ref); |
| {done, Ref} -> |
| flush_parser_messages(Ref) |
| after 0 -> |
| ok |
| end. |