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diff --git a/lib/tesla/multipart.ex b/lib/tesla/multipart.ex
index a444a79..69c10ba 100644
--- a/lib/tesla/multipart.ex
+++ b/lib/tesla/multipart.ex
@@ -1,201 +1,200 @@
defmodule Tesla.Multipart do
@moduledoc """
Multipart functionality.
## Example
```
mp =
Multipart.new()
|> Multipart.add_content_type_param("charset=utf-8")
|> Multipart.add_field("field1", "foo")
|> Multipart.add_field("field2", "bar",
headers: [{"content-id", "1"}, {"content-type", "text/plain"}]
)
|> Multipart.add_file("test/tesla/multipart_test_file.sh")
|> Multipart.add_file("test/tesla/multipart_test_file.sh", name: "foobar")
|> Multipart.add_file_content("sample file content", "sample.txt")
response = client.post(url, mp)
```
"""
defmodule Part do
@moduledoc false
defstruct body: nil,
dispositions: [],
headers: []
@type t :: %__MODULE__{
body: String.t(),
headers: Tesla.Env.headers(),
dispositions: Keyword.t()
}
end
@boundary_chars "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
|> String.split("")
@type part_stream :: Enum.t()
@type part_value :: iodata | part_stream
defstruct parts: [],
boundary: nil,
content_type_params: []
@type t :: %__MODULE__{
parts: list(Tesla.Multipart.Part.t()),
boundary: String.t(),
content_type_params: [String.t()]
}
@doc """
Create a new Multipart struct to be used for a request body.
"""
@spec new() :: t
def new do
- %__MODULE__{boundary: unique_string(32)}
+ %__MODULE__{boundary: unique_string()}
end
@doc """
Add a parameter to the multipart content-type.
"""
@spec add_content_type_param(t, String.t()) :: t
def add_content_type_param(%__MODULE__{} = mp, param) do
%{mp | content_type_params: mp.content_type_params ++ [param]}
end
@doc """
Add a field part.
"""
@spec add_field(t, String.t(), part_value, Keyword.t()) :: t
def add_field(%__MODULE__{} = mp, name, value, opts \\ []) do
:ok = assert_part_value!(value)
{headers, opts} = Keyword.pop_first(opts, :headers, [])
part = %Part{
body: value,
headers: headers,
dispositions: [{:name, name}] ++ opts
}
%{mp | parts: mp.parts ++ [part]}
end
@doc """
Add a file part. The file will be streamed.
## Options
- `:name` - name of form param
- `:filename` - filename (defaults to path basename)
- `:headers` - additional headers
- `:detect_content_type` - auto-detect file content-type (defaults to false)
"""
@spec add_file(t, String.t(), Keyword.t()) :: t
def add_file(%__MODULE__{} = mp, path, opts \\ []) do
{filename, opts} = Keyword.pop_first(opts, :filename, Path.basename(path))
{headers, opts} = Keyword.pop_first(opts, :headers, [])
{detect_content_type, opts} = Keyword.pop_first(opts, :detect_content_type, false)
# add in detected content-type if necessary
headers =
case detect_content_type do
true -> List.keystore(headers, "content-type", 0, {"content-type", MIME.from_path(path)})
false -> headers
end
data = File.stream!(path, [:read], 2048)
add_file_content(mp, data, filename, opts ++ [headers: headers])
end
@doc """
Add a file part with value.
Same of `add_file/3` but the file content is read from `data` input argument.
## Options
- `:name` - name of form param
- `:headers` - additional headers
"""
@spec add_file_content(t, part_value, String.t(), Keyword.t()) :: t
def add_file_content(%__MODULE__{} = mp, data, filename, opts \\ []) do
{name, opts} = Keyword.pop_first(opts, :name, "file")
add_field(mp, name, data, opts ++ [filename: filename])
end
@doc false
@spec headers(t) :: Tesla.Env.headers()
def headers(%__MODULE__{boundary: boundary, content_type_params: params}) do
ct_params = (["boundary=#{boundary}"] ++ params) |> Enum.join("; ")
[{"content-type", "multipart/form-data; #{ct_params}"}]
end
@doc false
@spec body(t) :: part_stream
def body(%__MODULE__{boundary: boundary, parts: parts}) do
part_streams = Enum.map(parts, &part_as_stream(&1, boundary))
Stream.concat(part_streams ++ [["--#{boundary}--\r\n"]])
end
@doc false
@spec part_as_stream(Part.t(), String.t()) :: part_stream
def part_as_stream(
%Part{body: body, dispositions: dispositions, headers: part_headers},
boundary
) do
part_headers = Enum.map(part_headers, fn {k, v} -> "#{k}: #{v}\r\n" end)
part_headers = part_headers ++ [part_headers_for_disposition(dispositions)]
enum_body =
case body do
b when is_binary(b) -> [b]
b -> b
end
Stream.concat([
["--#{boundary}\r\n"],
part_headers,
["\r\n"],
enum_body,
["\r\n"]
])
end
@doc false
@spec part_headers_for_disposition(Keyword.t()) :: [String.t()]
def part_headers_for_disposition([]), do: []
def part_headers_for_disposition(kvs) do
ds =
kvs
|> Enum.map(fn {k, v} -> "#{k}=\"#{v}\"" end)
|> Enum.join("; ")
["content-disposition: form-data; #{ds}\r\n"]
end
- @spec unique_string(pos_integer) :: String.t()
- defp unique_string(length) do
- Enum.reduce(1..length, [], fn _i, acc ->
- [Enum.random(@boundary_chars) | acc]
- end)
- |> Enum.join("")
+ @spec unique_string() :: String.t()
+ defp unique_string() do
+ 16
+ |> :crypto.strong_rand_bytes()
+ |> Base.encode16(case: :lower)
end
@spec assert_part_value!(any) :: :ok | no_return
defp assert_part_value!(%maybe_stream{})
when maybe_stream in [IO.Stream, File.Stream, Stream],
do: :ok
defp assert_part_value!(value)
when is_list(value)
when is_binary(value),
do: :ok
defp assert_part_value!(val) do
raise(ArgumentError, "#{inspect(val)} is not a supported multipart value.")
end
end

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