From edba600ece2e0192e70a9cbe4861e9bcf10f3865 Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordberg.se>
Date: Mon, 15 Sep 2014 14:23:09 +0200
Subject: Implement get-proof-by-hash.

---
 src/v1.erl | 35 ++++++++++++++++++++++++++++-------
 1 file changed, 28 insertions(+), 7 deletions(-)

diff --git a/src/v1.erl b/src/v1.erl
index c60df1d..2ca7726 100644
--- a/src/v1.erl
+++ b/src/v1.erl
@@ -50,15 +50,15 @@
     deliver(SessionID, binary_to_list(jiffy:encode({R}))).
 
 'get-sth-consistency'(SessionID, _Env, Input) ->
-    %% TODO: move argument parsing to a generic function
     R = case lists:sort(httpd:parse_query(Input)) of
             [{"first", FirstInput}, {"second", SecondInput}] ->
                 {First, _} = string:to_integer(FirstInput),
                 {Second, _} = string:to_integer(SecondInput),
                 case lists:member(error, [First, Second]) of
                     true ->
-                        html("get-sth-consistency: bad input:", [First, Second]);
-                    _ ->
+                        html("get-sth-consistency: bad input:",
+                             [FirstInput, SecondInput]);
+                    false ->
                         binary_to_list(
                           jiffy:encode(
                             [base64:encode(X) ||
@@ -67,21 +67,42 @@
             _ -> html("get-sth-consistency: bad input:", Input)
         end,
     deliver(SessionID, R).
-'get-proof-by-hash'(SessionID, _Env, _Input) ->
-    niy(SessionID).
+
+'get-proof-by-hash'(SessionID, _Env, Input) ->
+    R = case lists:sort(httpd:parse_query(Input)) of
+            [{"hash", HashInput}, {"tree_size", TreeSizeInput}] ->
+                Hash = case (catch base64:decode(HashInput)) of
+                           {'EXIT', _} -> error;
+                           H -> H
+                       end,
+                {TreeSize, _} = string:to_integer(TreeSizeInput),
+                case lists:member(error, [Hash, TreeSize]) of
+                    true ->
+                        html("get-proof-by-hash: bad input:",
+                             [HashInput, TreeSizeInput]);
+                    false ->
+                        binary_to_list(
+                          jiffy:encode(
+                            [base64:encode(X) ||
+                                X <- plop:inclusion(Hash, TreeSize)]))
+                end;
+            _ -> html("get-sth-proof-by-hash: bad input:", Input)
+        end,
+    deliver(SessionID, R).
+
 'get-entries'(SessionID, _Env, Input) ->
-    %% TODO: move argument parsing to a generic function
     R = case lists:sort(httpd:parse_query(Input)) of
             [{"end", EndInput}, {"start", StartInput}] ->
                 {Start, _} = string:to_integer(StartInput),
                 {End, _} = string:to_integer(EndInput),
                 case lists:member(error, [Start, End]) of
                     true -> html("get-entries: bad input:", [Start, End]);
-                    _ -> encode_entries(plop:get(Start, End))
+                    false -> encode_entries(plop:get(Start, End))
                 end;
             _ -> html("get-entries: bad input:", Input)
         end,
     deliver(SessionID, R).
+
 'get-entry-and-proof'(SessionID, _Env, _Input) ->
     niy(SessionID).
 
-- 
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