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mod_yaml_import.erl
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mod_yaml_import.erl
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%% @author Arthur Clemens
%% @copyright 2013 Arthur Clemens
%% Generated on 2013-08-16
%% @doc YAML data import
-module(mod_yaml_import).
-author("Arthur Clemens").
-mod_title("YAML import").
-mod_description("Import YAML data into Zotonic.").
-mod_prio(500).
-mod_depends([base, admin]).
-include_lib("zotonic.hrl").
-include_lib("modules/mod_admin/include/admin_menu.hrl").
-export([
init/1,
observe_admin_menu/3,
event/2,
record_values/2,
category_list/2,
meta_category_list/1,
predicate_list/1,
validate/3,
get_prop/3
]).
-define(KEY_STORAGE_DATA, "yaml_import_data").
init(_Context) ->
application:start(yamerl),
ok.
observe_admin_menu(admin_menu, Acc, _Context) ->
[
#menu_item{id=yaml_import,
parent=admin_modules,
label="Import YAML data",
url={admin_yaml_import},
visiblecheck={acl, use, mod_yaml_import}}
|Acc].
%% Submitted form, either with JSON data or without.
%% If no JSON is passed, we use the file to populate the settings screen.
event(#submit{message={import, _}}, Context) ->
File = z_context:get_q("filename", Context),
Json = z_context:get_q("json", Context),
case Json of
undefined ->
handleFileUpload(File, Context);
[] ->
handleFileUpload(File, Context);
_ ->
handleImport(File, Json, Context)
end.
%% Reads uploaded YAML file and stores the data in persistent
%% Invokes action 'init_record_structure' to call JavaScript with the data structure (not the contents).
handleFileUpload(File, Context) ->
case File of
[] -> handleFileError(Context);
_ ->
Data = parseFile(File),
case Data of
undefined ->
handleFileError(Context);
_ ->
% Store data for later when user decides to import
z_context:set_persistent(?KEY_STORAGE_DATA, Data, Context),
PageNum = 1,
Page = lists:nth(PageNum, Data),
PageCount = length(Data),
Keys = lists:map(fun({K,_}) -> K end, Page),
% Remove possible leftover error message
Context1 = z_render:update_selector(".admin-yaml-import-upload-error", "", Context),
% Show form page
Html = z_template:render("_step_settings_form.tpl", [{pageCount, PageCount}], Context1),
Context2 = z_render:update_selector(".admin-yaml-import-form", Html, Context1),
% Pass record structure to javascript
Record = lists:map(fun(K) ->
[
{name, K},
{included, true}
]
end, Keys),
Json = mochijson2:encode(Record),
z_render:wire({init_record_structure, [{json, Json}]}, Context2)
end
end.
handleImport(File, Json, Context) ->
Data = parseFile(File),
Context1 = case Data of
undefined ->
z_render:growl_error("No data found", Context);
_ ->
{struct, JsonData} = mochijson2:decode(Json),
Result = handle_spawn(Data, JsonData, Context),
ResultJson = mochijson2:encode(Result),
z_render:wire({record_imported, [{json, ResultJson}]}, Context)
end,
Context1.
handleFileError(Context) ->
Html = z_template:render("_admin_yaml_import_error.tpl", [{message, io_lib:format("Could not parse file.", [])}], Context),
z_render:update_selector(".admin-yaml-import-upload-error", Html, Context).
parseFile(File) ->
{ok, FileData} = file:read_file(File#upload.tmpfile),
FileString = unicode:characters_to_list(FileData, utf8),
case FileString of
[] -> undefined;
_ ->
% Parse data
FileString1 = FileString ++ "\n",
try yamerl_constr:string(FileString1, [str_node_as_binary]) of
Docs -> Docs,
hd(Docs)
catch
_ -> undefined
end
end.
handle_spawn(Data, JsonData, Context) ->
Parent = self(),
Child = spawn_link(fun() -> Parent ! {self(), apply(import_yaml, import, [Data, JsonData, Context])} end),
receive
{Child, X} -> X
end.
get_prop(Id, Prop, Context) ->
RawValue = case m_rsc:p(Id, Prop, Context) of
{trans, _} = T -> z_trans:lookup(T, Context);
Value -> Value
end,
to_binary(RawValue).
%% Retrieves 1 page/record of data values.
%% @spec record_values(PageNum, Context) -> Props
record_values(PageNum, Context) ->
% assumes data exists in persistent
%% TODO: error check unpacking data
Data = z_context:get_persistent(?KEY_STORAGE_DATA, Context),
PageNum1 = min_num(PageNum, 1),
PageNum2 = max_num(PageNum1, length(Data)),
Page = lists:nth(PageNum2, Data),
Props = [
{pageNum, PageNum2},
{hasNext, (PageNum2 =/= length(Data))},
{hasPrevious, (PageNum2 =/= 1)},
{values, Page}
],
Props.
category_list(PredicateId, Context) ->
case PredicateId of
undefined ->
FlatList = m_category:all_flat(Context),
lists:map(fun({Id, _, _, _}) ->
[Id, get_prop(Id, title, Context)]
end, FlatList);
_ ->
CategoryList = m_predicate:objects(PredicateId, Context),
lists:map(fun(Id) ->
[Id, get_prop(Id, title, Context)]
end, CategoryList)
end.
meta_category_list(Context) ->
{_, CategoryId} = m_rsc:name_to_id("category", Context),
{_, PredicateId} = m_rsc:name_to_id("predicate", Context),
MetaCategoryList = [CategoryId, PredicateId],
lists:map(fun(Id) ->
[Id, get_prop(Id, title, Context)]
end, MetaCategoryList).
predicate_list(Context) ->
PredicateList = m_predicate:all(Context),
lists:map(fun({_, Props}) ->
Id = proplists:get_value(id, Props),
[Id, get_prop(Id, title, Context)]
end, PredicateList).
validate(FieldName, FieldValue, Context) ->
case FieldName of
"fieldName" -> validate_fieldName(FieldValue, Context);
"rangeTo" -> validate_range(FieldValue, Context);
"rangeFrom" -> validate_range(FieldValue, Context);
_ -> {error, "Unknown field"}
end.
validate_fieldName(FieldValue, _)
when FieldValue =:= ""
-> {error, "Enter a name"};
validate_fieldName(FieldValue, _)
when FieldValue =:= "id"
orelse FieldValue =:= "title"
orelse FieldValue =:= "tag"
orelse FieldValue =:= "category"
orelse FieldValue =:= "translation"
orelse FieldValue =:= "modified"
-> {error, "This name is reserved"};
validate_fieldName(FieldValue, _) ->
[H|_] = FieldValue,
case (H == string:to_lower(H)) of
false -> {error, "Must start with lowercase"};
true ->
RegExp = "^[a-z][a-zA-Z_]*$",
case re:run(FieldValue, RegExp) of
{match, _} -> {ok, 1};
nomatch -> {error, "Not a valid name"}
end
end.
validate_range(FieldValue, Context) ->
{Value, Rest} = string:to_integer(FieldValue),
case Value of
error ->
{error, "Enter a number"};
_ ->
case (Rest == []) of
false -> {error, list_to_binary("Enter a rounded number")};
true ->
Data = z_context:get_persistent(?KEY_STORAGE_DATA, Context),
Max = length(Data),
case (Value >= 1 andalso Value =< Max) of
true -> {ok, 1};
false -> {error, list_to_binary(io_lib:format("Enter a number between 1 and ~p", [Max]))}
end
end
end.
%% Returns the lowest number
min_num(N, Min) when N < Min ->
Min;
min_num(N, _) ->
N.
%% Returns the highest number
max_num(N, Max) when N > Max ->
Max;
max_num(N, _) ->
N.
to_binary(V) when is_list(V) -> list_to_binary(V);
to_binary(V) when is_integer(V) -> list_to_binary(integer_to_list(V));
to_binary(V) -> V.