From cd565a2323f6f255ebbd387167ecfc875938abc5 Mon Sep 17 00:00:00 2001
From: SimonLab <simon.labondance@gmail.com>
Date: Wed, 23 Jan 2019 16:47:07 +0000
Subject: [PATCH 1/2] create a default CIDv1, #11

---
 lib/cid.ex | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/lib/cid.ex b/lib/cid.ex
index 2ac2bb3..eb9a310 100644
--- a/lib/cid.ex
+++ b/lib/cid.ex
@@ -35,4 +35,39 @@ defmodule Cid do
     |> Enum.map(fn (x) -> Map.get(input_map, x) end)
     |> Enum.join("")
   end
+
+  def encodeCid(data) do
+    # CIDv1 is multibase - cid version - multicontent - multihash
+    # with base58btc - version 1 - protobuf - multihash (ie CIDv0)
+
+    # define all these value in hex, then concat them then encode with base58btc to get the cid
+
+    # table value is 0xz ie 57 in decimal (the last value of the charecter set in base58)
+    # see https://github.com/multiformats/multibase/blob/master/multibase.csv
+    base58btc = Integer.to_string(57, 16)
+    # 0 or 1
+    version1 = Integer.to_string(1, 16)
+    # protobuf is 0x50 in table https://github.com/multiformats/multicodec/blob/master/table.csv
+    protobuf = Integer.to_string(83,16)
+
+    multihash = get_multihash(data)
+
+    base58btc <> version1 <> protobuf <> multihash
+  end
+
+  def get_multihash(data) do
+    data
+    |> hash()
+    |> multihash()
+    |> encode()
+  end
+
+
+
+  def hash(data), do: :crypto.hash(:sha256, data)
+
+  def multihash(digest), do: Multihash.encode(:sha2_256, digest)
+
+  def encode({:ok, multihash}), do: Base.encode16(multihash, case: :lower)
+
 end

From 288783644fd7316cc7cfe8275f65c527d6363e94 Mon Sep 17 00:00:00 2001
From: Robert Francis <robertefrancis18@gmail.com>
Date: Thu, 24 Jan 2019 13:50:58 +0000
Subject: [PATCH 2/2] beginnings of creating our own CIDv1 function

---
 lib/cid.ex        | 35 ++++++++++++++++++++++-------------
 test/cid_test.exs | 27 ++++++++++++++++-----------
 2 files changed, 38 insertions(+), 24 deletions(-)

diff --git a/lib/cid.ex b/lib/cid.ex
index eb9a310..524d5e1 100644
--- a/lib/cid.ex
+++ b/lib/cid.ex
@@ -44,30 +44,39 @@ defmodule Cid do
 
     # table value is 0xz ie 57 in decimal (the last value of the charecter set in base58)
     # see https://github.com/multiformats/multibase/blob/master/multibase.csv
-    base58btc = Integer.to_string(57, 16)
-    # 0 or 1
-    version1 = Integer.to_string(1, 16)
-    # protobuf is 0x50 in table https://github.com/multiformats/multicodec/blob/master/table.csv
-    protobuf = Integer.to_string(83,16)
-
-    multihash = get_multihash(data)
-
-    base58btc <> version1 <> protobuf <> multihash
+    # base58btc = Integer.to_string(57, 16)
+    # # 0 or 1
+    # version1 = Integer.to_string(1, 16)
+    # # protobuf is 0x50 in table https://github.com/multiformats/multicodec/blob/master/table.csv
+    # protobuf = Integer.to_string(83,16)
+    #
+    # multihash = get_multihash(data)
+    #
+    # base58btc <> version1 <> protobuf <> multihash
+
+    v1 = <<1>>
+    # protob = "P" # binary for "P" is <<80>>
+    raw = "U" # binary for "U" is <<85>>
+    {:ok, mh} =
+      data
+      |> hash()
+      |> multihash()
+
+    concat = v1 <> raw <> mh
+    encode(concat) # convert this to base58 and then prefix "z"
   end
 
   def get_multihash(data) do
     data
     |> hash()
     |> multihash()
-    |> encode()
+    # |> encode()
   end
 
-
-
   def hash(data), do: :crypto.hash(:sha256, data)
 
   def multihash(digest), do: Multihash.encode(:sha2_256, digest)
 
   def encode({:ok, multihash}), do: Base.encode16(multihash, case: :lower)
-
+  def encode(binary), do: Base.encode16(binary, case: :lower)
 end
diff --git a/test/cid_test.exs b/test/cid_test.exs
index ab6c192..e5b58ba 100644
--- a/test/cid_test.exs
+++ b/test/cid_test.exs
@@ -2,17 +2,22 @@ defmodule CidTest do
   use ExUnit.Case
   doctest Cid
 
-  test "Creates a deterministic Content ID from Elixir String" do
-    assert Cid.make("Elixir") == "NSqJspBr2u1F6z1DhcR2cnQAxLdQZBLk"
-  end
-
-  test "Create a CID from a Map" do
-    map = %{cat: "Meow", dog: "Woof", fox: "What Does The Fox Say?"}
-    assert Cid.make(map) == "GdrVnsLSdxRphXgQgNsmq1FDyRXAySXT"
-  end
+  # test "Creates a deterministic Content ID from Elixir String" do
+  #   assert Cid.make("Elixir") == "NSqJspBr2u1F6z1DhcR2cnQAxLdQZBLk"
+  # end
+  #
+  # test "Create a CID from a Map" do
+  #   map = %{cat: "Meow", dog: "Woof", fox: "What Does The Fox Say?"}
+  #   assert Cid.make(map) == "GdrVnsLSdxRphXgQgNsmq1FDyRXAySXT"
+  # end
+  #
+  # test "Cid.make(\"hello world\")" do
+  #   assert Cid.make("hello world") == "MJ7MSJwS1utMxA9QyQLytNDtd5RGnx6m"
+  # end
 
-  test "Cid.make(\"hello world\")" do
-    assert Cid.make("hello world") == "MJ7MSJwS1utMxA9QyQLytNDtd5RGnx6m"
+  test "test encodeCid function" do
+    str = "Hello World\n"
+    Cid.encodeCid(str)
+    |> IO.inspect(label: "result of test")
   end
-
 end