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operation.ex
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defmodule OpenApiSpex.Operation do
@moduledoc """
Defines the `OpenApiSpex.Operation.t` type.
"""
alias OpenApiSpex.{
Callback,
ExternalDocumentation,
MediaType,
Operation,
Parameter,
Reference,
RequestBody,
Response,
Responses,
Schema,
SecurityRequirement,
Server,
}
@enforce_keys :responses
defstruct [
:tags,
:summary,
:description,
:externalDocs,
:operationId,
:parameters,
:requestBody,
:responses,
:callbacks,
:deprecated,
:security,
:servers
]
@typedoc """
[Operation Object](https://swagger.io/specification/#operationObject)
Describes a single API operation on a path.
"""
@type t :: %__MODULE__{
tags: [String.t] | nil,
summary: String.t | nil,
description: String.t | nil,
externalDocs: ExternalDocumentation.t | nil,
operationId: String.t | nil,
parameters: [Parameter.t | Reference.t] | nil,
requestBody: RequestBody.t | Reference.t | nil,
responses: Responses.t,
callbacks: %{String.t => Callback.t | Reference.t} | nil,
deprecated: boolean | nil,
security: [SecurityRequirement.t] | nil,
servers: [Server.t] | nil
}
@doc """
Constructs an Operation struct from the plug and opts specified in the given route
"""
@spec from_route(PathItem.route) :: t
def from_route(route) do
from_plug(route.plug, route.opts)
end
@doc """
Constructs an Operation struct from plug module and opts
"""
@spec from_plug(module, any) :: t
def from_plug(plug, opts) do
plug.open_api_operation(opts)
end
@doc """
Shorthand for constructing a Parameter name, location, type, description and optional examples
"""
@spec parameter(atom, Parameter.location, Reference.t | Schema.t | atom, String.t, keyword) :: Parameter.t
def parameter(name, location, type, description, opts \\ []) do
params =
[name: name, in: location, description: description, required: location == :path]
|> Keyword.merge(opts)
Parameter
|> struct(params)
|> Parameter.put_schema(type)
end
@doc """
Shorthand for constructing a RequestBody with description, media_type, schema and optional examples
"""
@spec request_body(String.t, String.t, (Schema.t | Reference.t | module), keyword) :: RequestBody.t
def request_body(description, media_type, schema_ref, opts \\ []) do
%RequestBody{
description: description,
content: %{
media_type => %MediaType{
schema: schema_ref,
example: opts[:example],
examples: opts[:examples]
}
},
required: opts[:required] || false
}
end
@doc """
Shorthand for constructing a Response with description, media_type, schema and optional examples
"""
@spec response(String.t, String.t, (Schema.t | Reference.t | module), keyword) :: Response.t
def response(description, media_type, schema_ref, opts \\ []) do
%Response{
description: description,
content: %{
media_type => %MediaType {
schema: schema_ref,
example: opts[:example],
examples: opts[:examples]
}
}
}
end
@doc """
Cast params to the types defined by the schemas of the operation parameters and requestBody
"""
@spec cast(Operation.t, Conn.t, String.t | nil, %{String.t => Schema.t}) :: {:ok, Plug.Conn.t} | {:error, String.t}
def cast(operation = %Operation{}, conn = %Plug.Conn{}, content_type, schemas) do
parameters = Enum.filter(operation.parameters || [], fn p -> Map.has_key?(conn.params, Atom.to_string(p.name)) end)
with :ok <- check_query_params_defined(conn, operation.parameters),
{:ok, parameter_values} <- cast_parameters(parameters, conn.params, schemas),
{:ok, body} <- cast_request_body(operation.requestBody, conn.body_params, content_type, schemas) do
{:ok, %{conn | params: parameter_values, body_params: body}}
end
end
@spec check_query_params_defined(Conn.t, list | nil) :: :ok | {:error, String.t}
defp check_query_params_defined(%Plug.Conn{} = conn, defined_params) when is_nil(defined_params) do
case conn.query_params do
%{} -> :ok
_ -> {:error, "No query parameters defined for this operation"}
end
end
defp check_query_params_defined(%Plug.Conn{} = conn, defined_params) when is_list(defined_params) do
defined_query_params = for param <- defined_params, param.in == :query, into: MapSet.new(), do: to_string(param.name)
case validate_parameter_keys(Map.keys(conn.query_params), defined_query_params) do
{:error, param} -> {:error, "Undefined query parameter: #{inspect(param)}"}
:ok -> :ok
end
end
@spec validate_parameter_keys([String.t], MapSet.t) :: {:error, String.t} | :ok
defp validate_parameter_keys([], _defined_params), do: :ok
defp validate_parameter_keys([param|params], defined_params) do
case MapSet.member?(defined_params, param) do
false -> {:error, param}
_ -> validate_parameter_keys(params, defined_params)
end
end
@spec cast_parameters([Parameter.t], map, %{String.t => Schema.t}) :: {:ok, map} | {:error, String.t}
defp cast_parameters([], _params, _schemas), do: {:ok, %{}}
defp cast_parameters([p | rest], params = %{}, schemas) do
with {:ok, cast_val} <- Schema.cast(Parameter.schema(p), params[Atom.to_string(p.name)], schemas),
{:ok, cast_tail} <- cast_parameters(rest, params, schemas) do
{:ok, Map.put_new(cast_tail, p.name, cast_val)}
end
end
@spec cast_request_body(RequestBody.t | nil, map, String.t | nil, %{String.t => Schema.t}) :: {:ok, map} | {:error, String.t}
defp cast_request_body(nil, _, _, _), do: {:ok, %{}}
defp cast_request_body(%RequestBody{content: content}, params, content_type, schemas) do
schema = content[content_type].schema
Schema.cast(schema, params, schemas)
end
@doc """
Validate params against the schemas of the operation parameters and requestBody
"""
@spec validate(Operation.t, Conn.t, String.t | nil, %{String.t => Schema.t}) :: :ok | {:error, String.t}
def validate(operation = %Operation{}, conn = %Plug.Conn{}, content_type, schemas) do
with :ok <- validate_required_parameters(operation.parameters || [], conn.params),
parameters <- Enum.filter(operation.parameters || [], &Map.has_key?(conn.params, &1.name)),
:ok <- validate_parameter_schemas(parameters, conn.params, schemas),
:ok <- validate_body_schema(operation.requestBody, conn.body_params, content_type, schemas) do
:ok
end
end
@spec validate_required_parameters([Parameter.t], map) :: :ok | {:error, String.t}
defp validate_required_parameters(parameter_list, params = %{}) do
required =
parameter_list
|> Stream.filter(fn parameter -> parameter.required end)
|> Enum.map(fn parameter -> parameter.name end)
missing = required -- Map.keys(params)
case missing do
[] -> :ok
_ -> {:error, "Missing required parameters: #{inspect(missing)}"}
end
end
@spec validate_parameter_schemas([Parameter.t()], map, %{String.t() => Schema.t()}) ::
:ok | {:error, String.t()}
defp validate_parameter_schemas([], %{} = _params, _schemas), do: :ok
defp validate_parameter_schemas([p | rest], %{} = params, schemas) do
{:ok, parameter_value} = Map.fetch(params, p.name)
with :ok <- Schema.validate(Parameter.schema(p), parameter_value, schemas) do
validate_parameter_schemas(rest, params, schemas)
end
end
@spec validate_body_schema(RequestBody.t | nil, map, String.t | nil, %{String.t => Schema.t}) :: :ok | {:error, String.t}
defp validate_body_schema(nil, _, _, _), do: :ok
defp validate_body_schema(%RequestBody{required: false}, params, _content_type, _schemas) when map_size(params) == 0 do
:ok
end
defp validate_body_schema(%RequestBody{content: content}, params, content_type, schemas) do
content
|> Map.get(content_type)
|> Map.get(:schema)
|> Schema.validate(params, schemas)
end
end

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