Support case insensitive headers (DockYard#161)

Closes DockYard#160

lib/mail/parsers/rfc_2822.ex

@@ -258,7 +258,7 @@ defmodule Mail.Parsers.RFC2822 do
     [name, body] = String.split(header, ":", parts: 2)
     key = String.downcase(name)
     decoded = parse_encoded_word(body)
-    headers = put_header(message.headers, key, parse_header_value(name, decoded))
+    headers = put_header(message.headers, key, String.downcase(name) |> parse_header_value(decoded))
     message = %{message | headers: headers}
     parse_headers(message, tail)
   end
@@ -284,36 +284,36 @@ defmodule Mail.Parsers.RFC2822 do
   defp parse_header_value(key, "\t" <> value),
     do: parse_header_value(key, value)
 
-  defp parse_header_value("To", value),
+  defp parse_header_value("to", value),
     do: parse_recipient_value(value)
 
-  defp parse_header_value("CC", value),
+  defp parse_header_value("cc", value),
     do: parse_recipient_value(value)
 
-  defp parse_header_value("From", value),
+  defp parse_header_value("from", value),
     do:
       parse_recipient_value(value)
       |> List.first()
 
-  defp parse_header_value("Reply-To", value),
+  defp parse_header_value("reply-to", value),
     do:
       parse_recipient_value(value)
       |> List.first()
 
-  defp parse_header_value("Date", timestamp),
+  defp parse_header_value("date", timestamp),
     do: to_datetime(timestamp)
 
-  defp parse_header_value("Received", value),
+  defp parse_header_value("received", value),
     do: parse_received_value(value)
 
-  defp parse_header_value("Content-Type", value) do
+  defp parse_header_value("content-type", value) do
     case parse_structured_header_value(value) do
       [_ | _] = header -> header
       <<value::binary>> -> [value, {"charset", "us-ascii"}]
     end
   end
 
-  defp parse_header_value("Content-Disposition", value),
+  defp parse_header_value("content-disposition", value),
     do: parse_structured_header_value(value)
 
   defp parse_header_value(_key, value),

mix.lock

@@ -1,11 +1,8 @@
 %{
-  "earmark": {:hex, :earmark, "1.4.10", "bddce5e8ea37712a5bfb01541be8ba57d3b171d3fa4f80a0be9bcf1db417bcaf", [:mix], [{:earmark_parser, ">= 1.4.10", [hex: :earmark_parser, repo: "hexpm", optional: false]}], "hexpm", "12dbfa80810478e521d3ffb941ad9fbfcbbd7debe94e1341b4c4a1b2411c1c27"},
-  "earmark_parser": {:hex, :earmark_parser, "1.4.33", "3c3fd9673bb5dcc9edc28dd90f50c87ce506d1f71b70e3de69aa8154bc695d44", [:mix], [], "hexpm", "2d526833729b59b9fdb85785078697c72ac5e5066350663e5be6a1182da61b8f"},
-  "ex_doc": {:hex, :ex_doc, "0.30.3", "bfca4d340e3b95f2eb26e72e4890da83e2b3a5c5b0e52607333bf5017284b063", [:mix], [{:earmark_parser, "~> 1.4.31", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "fbc8702046c1d25edf79de376297e608ac78cdc3a29f075484773ad1718918b6"},
-  "makeup": {:hex, :makeup, "1.1.0", "6b67c8bc2882a6b6a445859952a602afc1a41c2e08379ca057c0f525366fc3ca", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "0a45ed501f4a8897f580eabf99a2e5234ea3e75a4373c8a52824f6e873be57a6"},
+  "earmark_parser": {:hex, :earmark_parser, "1.4.39", "424642f8335b05bb9eb611aa1564c148a8ee35c9c8a8bba6e129d51a3e3c6769", [:mix], [], "hexpm", "06553a88d1f1846da9ef066b87b57c6f605552cfbe40d20bd8d59cc6bde41944"},
+  "ex_doc": {:hex, :ex_doc, "0.31.1", "8a2355ac42b1cc7b2379da9e40243f2670143721dd50748bf6c3b1184dae2089", [:mix], [{:earmark_parser, "~> 1.4.39", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.1", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "3178c3a407c557d8343479e1ff117a96fd31bafe52a039079593fb0524ef61b0"},
+  "makeup": {:hex, :makeup, "1.1.1", "fa0bc768698053b2b3869fa8a62616501ff9d11a562f3ce39580d60860c3a55e", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "5dc62fbdd0de44de194898b6710692490be74baa02d9d108bc29f007783b0b48"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.16.1", "cc9e3ca312f1cfeccc572b37a09980287e243648108384b97ff2b76e505c3555", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "e127a341ad1b209bd80f7bd1620a15693a9908ed780c3b763bccf7d200c767c6"},
-  "makeup_erlang": {:hex, :makeup_erlang, "0.1.2", "ad87296a092a46e03b7e9b0be7631ddcf64c790fa68a9ef5323b6cbb36affc72", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "f3f5a1ca93ce6e092d92b6d9c049bcda58a3b617a8d888f8e7231c85630e8108"},
-  "mimerl": {:hex, :mimerl, "1.1.0"},
-  "nimble_parsec": {:hex, :nimble_parsec, "1.3.1", "2c54013ecf170e249e9291ed0a62e5832f70a476c61da16f6aac6dca0189f2af", [:mix], [], "hexpm", "2682e3c0b2eb58d90c6375fc0cc30bc7be06f365bf72608804fb9cffa5e1b167"},
-  "plug": {:hex, :plug, "1.1.0"},
+  "makeup_erlang": {:hex, :makeup_erlang, "0.1.3", "d684f4bac8690e70b06eb52dad65d26de2eefa44cd19d64a8095e1417df7c8fd", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "b78dc853d2e670ff6390b605d807263bf606da3c82be37f9d7f68635bd886fc9"},
+  "nimble_parsec": {:hex, :nimble_parsec, "1.4.0", "51f9b613ea62cfa97b25ccc2c1b4216e81df970acd8e16e8d1bdc58fef21370d", [:mix], [], "hexpm", "9c565862810fb383e9838c1dd2d7d2c437b3d13b267414ba6af33e50d2d1cf28"},
 }

test/mail/parsers/rfc_2822_test.exs

@@ -687,6 +687,15 @@ defmodule Mail.Parsers.RFC2822Test do
     assert message.headers["content-type"] == ["text/html", {"charset", "us-ascii"}]
   end
 
+  test "content-type with atypical casing" do
+    message =
+      parse_email("""
+      Content-type: text/html; charset=us-ascii
+      """)
+
+    assert message.headers["content-type"] == ["text/html", {"charset", "us-ascii"}]
+  end
+
   test "content-type with implicit charset" do
     message =
       parse_email("""