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diff --git a/lib/tesla/middleware/json.ex b/lib/tesla/middleware/json.ex
index 23894ed..3d8912f 100644
--- a/lib/tesla/middleware/json.ex
+++ b/lib/tesla/middleware/json.ex
@@ -1,147 +1,150 @@
defmodule Tesla.Middleware.JSON do
@behaviour Tesla.Middleware
@moduledoc """
Encode requests and decode responses as JSON.
This middleware requires [poison](https://hex.pm/packages/poison) (or other engine) as dependency.
Remember to add `{:poison, ">= 1.0"}` to dependencies (and `:poison` to applications in `mix.exs`)
Also, you need to recompile tesla after adding `:poison` dependency:
```
mix deps.clean tesla
mix deps.compile tesla
```
### Example usage
```
defmodule MyClient do
use Tesla
plug Tesla.Middleware.JSON # use poison engine
# or
plug Tesla.Middleware.JSON, engine: JSX, engine_opts: [strict: [:comments]]
# or
plug Tesla.Middleware.JSON, decode: &JSX.decode/1, encode: &JSX.encode/1
end
```
### Options
- `:decode` - decoding function
- `:encode` - encoding function
- `:engine` - encode/decode engine, e.g `Poison` or `JSX` (defaults to Poison)
- `:engine_opts` - optional engine options
- `:decode_content_types` - list of additional decodable content-types
"""
# NOTE: text/javascript added to support Facebook Graph API.
# see https://github.com/teamon/tesla/pull/13
@default_content_types ["application/json", "text/javascript"]
@default_engine Poison
def call(env, next, opts) do
opts = opts || []
env
|> encode(opts)
|> Tesla.run(next)
|> decode(opts)
end
@doc """
Encode request body as JSON. Used by `Tesla.Middleware.EncodeJson`
"""
def encode(env, opts) do
if encodable?(env) do
env
|> Map.update!(:body, &encode_body(&1, opts))
|> Tesla.Middleware.Headers.call([], %{"content-type" => "application/json"})
else
env
end
end
defp encode_body(%Stream{} = body, opts), do: encode_stream(body, opts)
defp encode_body(body, opts) when is_function(body), do: encode_stream(body, opts)
defp encode_body(body, opts), do: process(body, :encode, opts)
defp encode_stream(body, opts) do
Stream.map body, fn item -> encode_body(item, opts) <> "\n" end
end
defp encodable?(%{body: nil}), do: false
defp encodable?(%{body: body}) when is_binary(body), do: false
defp encodable?(%{body: %Tesla.Multipart{}}), do: false
defp encodable?(_), do: true
@doc """
Decode response body as JSON. Used by `Tesla.Middleware.DecodeJson`
"""
def decode(env, opts) do
if decodable?(env, opts) do
Map.update!(env, :body, &process(&1, :decode, opts))
else
env
end
end
defp decodable?(env, opts), do: decodable_body?(env) && decodable_content_type?(env, opts)
defp decodable_body?(env) do
(is_binary(env.body) && env.body != "") ||
(is_list(env.body) && env.body != [])
end
defp decodable_content_type?(env, opts) do
case env.headers["content-type"] do
nil -> false
content_type -> Enum.any?(content_types(opts), &String.starts_with?(content_type, &1))
end
end
defp content_types(opts), do: @default_content_types ++ Keyword.get(opts, :decode_content_types, [])
defp process(data, op, opts) do
with {:ok, value} <- do_process(data, op, opts) do
value
else
{:error, reason} -> raise %Tesla.Error{message: "JSON #{op} error: #{inspect reason}", reason: reason}
+ {:error, msg, position} ->
+ reason = {msg, position}
+ raise %Tesla.Error{message: "JSON #{op} error: #{inspect reason}", reason: reason}
end
end
defp do_process(data, op, opts) do
if fun = opts[op] do # :encode/:decode
fun.(data)
else
engine = Keyword.get(opts, :engine, @default_engine)
opts = Keyword.get(opts, :engine_opts, [])
apply(engine, op, [data, opts])
end
end
end
defmodule Tesla.Middleware.DecodeJson do
def call(env, next, opts) do
opts = opts || []
env
|> Tesla.run(next)
|> Tesla.Middleware.JSON.decode(opts)
end
end
defmodule Tesla.Middleware.EncodeJson do
def call(env, next, opts) do
opts = opts || []
env
|> Tesla.Middleware.JSON.encode(opts)
|> Tesla.run(next)
end
end

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