Implemented ts_api:get_user/2, ts_api:put_user/1, and ts_api:post_user/1.

Created a utility function for OK results, ts_api:make_json_200/2
Created ts_common:new/1 and ts_common:update/1 to generalize record creation and update.
Refactored ts_timeline:new/1 and ts_timeline:update/1 to use the ts_common functions.
Implemented ts_json:record_to_ejson/1 and ts_json:ejson_to_record/1 for ts_user records.
Implemented ts_user module.

.gitignore

@@ -1 +1,3 @@
 *.sw?
+ebin/
+*.beam

src/ts_api.erl

@@ -85,11 +85,50 @@ dispatch_entry_by_date(YArg, Username, Timeline, Params) -> todo.
 % ======== IMPLEMENTATION ====== %
 % ============================== %
 
-get_user(YArg, Username) -> todo.
+get_user(YArg, Username) ->
+    case ts_user:lookup(Username) of
+        no_record -> make_json_404(YArg);
+        User -> make_json_200(YArg, User)
+    end.
 
-put_user(YArg, Username) -> todo.
+put_user(YArg, Username) -> 
+    % parse the request body
+    {done, {ok, EJSON}, _} = json:decode([], binary_to_list(YArg#arg.clidata)),
 
-post_user(YArg, Username) -> todo.
+    % parse into a user record
+    NewRecord = ts_json:ejson_to_record(#ts_user{}, EJSON),
+
+    case ts_user:new(NewRecord) of
+        % record created
+        ok -> [{status, 201}, make_json_200(YArg, NewRecord)];
+
+        % will not create, record exists
+        {error, {record_exists, ExistingRecord}} ->
+            JSONReturn = json:encode({struct, [
+                {status, "username taken"},
+                {see_docs, "/ts_api_doc/user#PUT"}
+            ]}),
+
+            [{status, 409}, {content, "application/json", JSONReturn}];
+
+        _Error -> make_json_500(YArg)
+    end.
+
+post_user(YArg, Username) -> 
+    % parse the POST data
+    {done, {ok, EJSON}, _} = json:decode([], binary_to_list(YArg#arg.clidata)),
+
+    % create the user record
+    NewRecord = ts_json:ejson_to_record(#ts_user{}, EJSON),
+
+    case ts_user:update(NewRecord) of
+        ok -> make_json_200(YArg, NewRecord);
+
+        no_record -> make_json_404(YArg,
+            [{status, "no_record"}, {see_docs, "/ts_api_doc/user#POST"}]);
+
+        _Error -> make_json_500(YArg)
+    end.
 
 delete_user(YArg, Username) -> todo.
 
@@ -98,13 +137,7 @@ get_timeline(YArg, Username, TimelineId) ->
 
         no_record -> make_json_404(YArg);
 
-        Timeline -> 
-            EJSONTimeline = ts_json:record_to_ejson(Timeline),
-            JSONReturn = json:encode({struct, [
-                {status, "ok"},
-                {timeline, EJSONTimeline}
-            ]}),
-            {content, "application/json", JSONReturn}
+        Timeline -> make_json_200(YArg, Timeline)
     end.
 
 put_timeline(YArg, Username, TimelineId) ->
@@ -119,16 +152,7 @@ put_timeline(YArg, Username, TimelineId) ->
     % insert into the database
     case ts_timeline:new(NewRecord) of
         % record created
-        ok ->
-
-            EJSONRec = ts_json:record_to_ejson(NewRecord),
-            JSONReturn = json:encode({struct, [
-                {status, "ok"},
-                {timeline, EJSONRec}
-            ]}),
-
-            % return the new record
-            [{status, 201}, {content, "application/json", JSONReturn}];
+        ok -> [{status, 201}, make_json_200(YArg, NewRecord)];
 
         % will not create, record exists
         {error, {record_exists, ExistingRecord}} ->
@@ -154,18 +178,10 @@ post_timeline(YArg, Username, TimelineId) ->
     NewRecord = ts_json:ejson_to_record(EmptyTimeline, EJSON),
 
     case ts_timeline:update(NewRecord) of
-        ok ->
+        ok -> make_json_200(YArg, NewRecord);
 
-            EJSONRec = ts_json:record_to_ejson(NewRecord),
-            JSONReturn = json:encode({struct, [
-                {status, "updated"},
-                {timeline, EJSONRec}
-            ]}),
-
-            {content, "application/json", JSONReturn};
-
-        no_record -> make_json_404(YArg, [{status, "no_record"},
-                {see_docs, "/ts_api_doc/timeline#PSOT"}]);
+        no_record -> make_json_404(YArg,
+            [{status, "no_record"}, {see_docs, "/ts_api_doc/timeline#PSOT"}]);
 
         _Error -> make_json_500(YArg)
     end.
@@ -194,9 +210,7 @@ list_entries(YArg, Username, Timeline) ->
     Entries = case SortOrder of
         asc -> ts_entry:list_asc({Username, Timeline}, Start, Length);
         desc -> ts_entry:list_desc({Username, Timeline}, Start, Length)
-    end
-    
-    .
+    end.
 
 get_entry_by_id(YArg, Username, Timeline, EventId) ->
     case ts_entry:lookup(Username, Timeline, EventId) of
@@ -205,17 +219,7 @@ get_entry_by_id(YArg, Username, Timeline, EventId) ->
         no_record -> make_json_404(YArg);
 
         % record found
-        Entry ->
-            % convert to EJSON
-            EJSONRec = ts_json:record_to_ejson(Entry),
-
-            % create response
-            JSONReturn = json:encode({struct, [
-                {status, "ok"},
-                {entry, EJSONRec}
-            ]}),
-
-            {content, "application/json", JSONReturn}
+        Entry -> make_json_200(YArg, Entry)
     end.
 
 % ============================== %
@@ -226,6 +230,16 @@ get_entry_by_id(YArg, Username, Timeline, EventId) ->
 path_element_to_atom(PE) ->
     list_to_atom(re:replace(PE, "\\s", "_", [{return, list}])).
 
+%% Create a JSON 200 response.
+make_json_200(YArg, Record) ->
+    EJSONRecord = ts_json:record_to_ejson(Record),
+    JSONReturn = json:encode({struct, [
+        {status, "ok"},
+        {element(1, Record), EJSONRecord}
+    ]}),
+
+    {content, "application/json", JSONReturn}.
+
 %% Create a JSON 404 response.
 make_json_404(YArg) -> make_json_404(YArg, []).
 make_json_404(YArg, Fields) ->

src/ts_common.erl

@@ -1,8 +1,33 @@
 -module(ts_common).
--export([list/3, order_datetimes/2]).
+-export([new/1, update/1, list/3, order_datetimes/2]).
 
 -include_lib("stdlib/include/qlc.hrl").
 
+new(Record) ->
+
+    Table = element(1, Record),
+
+    % check for existing record
+    case mnesia:dirty_read(Table, element(2, Record)) of
+        % record exists
+        [ExistingRecord] -> {error, {record_exists, ExistingRecord}};
+        
+        [] -> mnesia:dirty_write(Record)
+    end.
+
+update(Record) ->
+
+    Table = element(1, Record),
+    Key = element(2, Record),
+
+    % look for existing record
+    case mnesia:dirty_read(Table, Key) of
+        % record does not exist, cannot update
+        [] -> no_record;
+        % record does exist, update
+        [_ExistingRecord] -> mnesia:dirty_write(Record)
+    end.
+
 %% list <Length> number of records, skipping the first <Start>
 list(Table, Start, Length)
 when is_atom(Table) and is_integer(Start) and is_integer(Length) ->

src/ts_entry.erl

@@ -42,7 +42,7 @@ when is_integer(Start) and is_integer(Length) ->
         MatchHead = #ts_entry{ref = {Username, Timeline, '_'}, _='_'},
 
         % select all records that match
-        mnesia:select(ts_entry, [{MatchHead, [], ['$_']}]
+        mnesia:select(ts_entry, [{MatchHead, [], ['$_']}])
     end),
 
     % sort
@@ -69,7 +69,7 @@ list({Username, Timeline}, StartDateTime, EndDateTime, OrderFun) ->
         EndGuard = {'<', '$1', EndSeconds},
 
         mnesia:select(ts_entry, [{MatchHead, [StartGuard, EndGuard], ['$_']}])
-    end,
+    end),
 
     % sort
     lists:sort(OrderFun, Entries).

src/ts_json.erl

@@ -5,26 +5,36 @@
 
 encode_record(Record) -> lists:flatten(json:encode(record_to_ejson(Record))).
 
+record_to_ejson(Record=#ts_user{}) ->
+    {struct, [
+        {username, atom_to_list(Record#ts_user.username)},
+        {name, Record#ts_user.name},
+        {email, Record#ts_user.email},
+        {join_date, encode_datetime(Record#ts_user.join_date)}]};
+
 record_to_ejson(Record=#ts_timeline{}) ->
-    % pull out the timeline id
-    {_Username, TimelineId} = Record#ts_timeline.ref,
+    % pull out the username and timeline id
+    {Username, TimelineId} = Record#ts_timeline.ref,
 
     % create the EJSON struct
     {struct, [
-        {id, atom_to_list(TimelineId)},
+        {username, atom_to_list(Username)},
+        {timeline_id, atom_to_list(TimelineId)},
         {created, encode_datetime(Record#ts_timeline.created)},
         {description, Record#ts_timeline.desc}]};
 
 record_to_ejson(Record=#ts_entry{}) ->
-    % pull out the entry id
-    {_Username, _TimelineId, EntryId} = Record#ts_entry.ref,
+    % pull out the username, timeline id, and entry id
+    {Username, TimelineId, EntryId} = Record#ts_entry.ref,
 
     % convert the timestamp to a date-time
     DateTime = calendar:gregorian_seconds_to_datetime(Record#ts_entry.timestamp),
 
     % create the EJSON struct
     {struct, [
-        {id, EntryId},
+        {username, Username},
+        {timeline_id, TimelineId},
+        {entry_id, EntryId},
         {timestamp, encode_datetime(DateTime)},
         {mark, Record#ts_entry.mark},
         {notes, Record#ts_entry.notes}]}.
@@ -33,21 +43,40 @@ encode_datetime({{Year, Month, Day}, {Hour, Minute, Second}}) ->
     lists:flatten(io_lib:format("~4.10.0B-~2.10.0B-~2.10.0BT~2.10.0B:~2.10.0B:~2.10.0BZ", 
         [Year, Month, Day, Hour, Minute, Second])).
 
-ejson_to_record(Empty=#ts_timeline{}, EJSON) ->
+ejson_to_record(_Empty=#ts_user{}, EJSON) ->
     {struct, Fields} = EJSON,
-    {Username, _} = Empty#ts_timeline.ref,
+    
+    Pwd = case lists:keyfind(password, 1, Fields) of
+        false -> uninit; Field -> element(2, Field) end,
+
+    #ts_user{
+        username = element(2, lists:keyfind(username, 1, Fields)),
+        pwd = Pwd,
+        pwd_salt = uninit,
+        name = element(2, lists:keyfind(name, 1, Fields)),
+        email = element(2, lists:keyfind(email, 1, Fields)),
+        join_date = decode_datetime(
+            element(2, lists:keyfind(join_date, 1, Fields)))};
+
+ejson_to_record(_Empty=#ts_timeline{}, EJSON) ->
+    % The JSON records do not have username information
+    {struct, Fields} = EJSON,
+    Username = element(2, lists:keyfind(username, 1, Fields)),
+    TimelineId = element(2, lists:keyfind(timeline_id, 1, Fields)),
 
     #ts_timeline{
-        ref = {Username, element(2, lists:keyfind(id, 1, Fields))},
+        ref = {Username, TimelineId},
         created = decode_datetime(element(2, lists:keyfind(created, 1, Fields))),
         desc = element(2, lists:keyfind(description, 1, Fields))};
 
-ejson_to_record(Empty=#ts_entry{}, EJSON) ->
+ejson_to_record(_Empty=#ts_entry{}, EJSON) ->
     {struct, Fields} = EJSON,
-    {Username, TimelineId, _} = Empty#ts_entry.ref,
+    Username = element(2, lists:keyfind(username, 1, Fields)),
+    TimelineId = element(2, lists:keyfind(timeline_id, 1, Fields)),
+    EntryId = element(2, lists:keyfind(entry_id, 1, Fields)),
 
     #ts_entry{
-        ref = {Username, TimelineId, element(2, lists:keyfind(id, 1, Fields))},
+        ref = {Username, TimelineId, EntryId},
         timestamp = calendar:datetime_to_gregorian_seconds(decode_datetime(
             element(2, lists:keyfind(timestamp, 1, Fields)))),
         mark = element(2, lists:keyfind(mark, 1, Fields)),

src/ts_timeline.erl

@@ -9,21 +9,9 @@ create_table(TableOpts) ->
         TableOpts ++ [{attributes, record_info(fields, ts_timeline)},
                       {type, ordered_set}]).
 
-new(TR = #ts_timeline{}) ->
-    case mnesia:dirty_read(ts_timeline, TR#ts_timeline.ref) of
-        [ExistingRecord] -> {error, {record_exists, ExistingRecord}};
-        [] -> mnesia:dirty_write(TR)
-    end.
+new(TR = #ts_timeline{}) -> ts_common:new(TR).
 
-update(TR = #ts_timeline{}) ->
-    
-    % look for the existing record
-    case mnesia:dirty_read(ts_timeline, TR#ts_timeline.ref) of
-        % record does not exist
-        [] -> no_record;
-        % record exists, update
-        [_Record] -> mnesia:dirty_write(TR)
-    end.
+update(TR = #ts_timeline{}) -> ts_commone:update(TR).
     
 lookup(Username, TimelineId) ->
     case mnesia:dirty_read(ts_timeline, {Username, TimelineId}) of

src/ts_user.erl

@@ -1,5 +1,5 @@
 -module(ts_user).
--export([]).
+-export([create_table/1, new/1, update/1, lookup/1, list/2]).
 
 -include("ts_db_records.hrl").
 -include_lib("stdlib/include/qlc.hrl").
@@ -9,4 +9,38 @@ create_table(TableOpts) ->
         TableOpts ++ [{attributes, record_info(fields, ts_user)},
                       {type, ordered_set}]).
 
-%new(TR = #ts_user
+new(UR = #ts_user{}) -> 
+    case mnesia:dirty_read(ts_user, UR#ts_user.username) of
+        [ExistingRecord] -> {error, {record_exists, ExistingRecord}};
+        [] -> mnesia:dirty_write(hash_input_record(UR))
+    end.
+
+update(UR = #ts_user{}) -> 
+    case mnesia:dirty_read(ts_user, UR#ts_user.username) of
+        [] -> no_record;
+        [_Record] -> mnesia:dirty_write(hash_input_record(UR))
+    end.
+
+lookup(Username) ->
+    case mnesia:dirty_read(ts_user, Username) of
+        [] -> no_record;
+        [User] -> User
+    end.    
+
+list(Start, Length) -> ts_common:list(ts_user, Start, Length).
+
+hash_input_record(User=#ts_user{}) ->
+    % generate the password salt
+    Salt = generate_salt(),
+    % hash the password
+    HashedPwd = hash_pwd(User#ts_user.username, Salt),
+    % create a new User record
+    User#ts_user{pwd = HashedPwd, pwd_salt = Salt}.
+    
+generate_salt() ->
+    "This is a worthless salt value only suitable for testing.".
+
+hash_pwd(Password, Salt) -> do_hash(Password ++ Salt, []).
+
+do_hash([], Hashed) -> Hashed;
+do_hash([Char|Pwd], Hashed) -> do_hash(Pwd, [Char + 13 | Hashed]).