1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

//! Basic Request/Response structures used internally.

pub use hyper::{self, header::HeaderValue, Body, Method, StatusCode};

/// Simple server response structure
#[derive(Debug)]
pub struct Response {
	/// Response code
	pub code: StatusCode,
	/// Response content type
	pub content_type: HeaderValue,
	/// Response body
	pub content: String,
}

impl Response {
	/// Create a response with empty body and 200 OK status code.
	pub fn empty() -> Self {
		Self::ok(String::new())
	}

	/// Create a response with given body and 200 OK status code.
	pub fn ok<T: Into<String>>(response: T) -> Self {
		Response {
			code: StatusCode::OK,
			content_type: HeaderValue::from_static("application/json; charset=utf-8"),
			content: response.into(),
		}
	}

	/// Create a response for plaintext internal error.
	pub fn internal_error<T: Into<String>>(msg: T) -> Self {
		Response {
			code: StatusCode::INTERNAL_SERVER_ERROR,
			content_type: plain_text(),
			content: format!("Internal Server Error: {}", msg.into()),
		}
	}

	/// Create a json response for service unavailable.
	pub fn service_unavailable<T: Into<String>>(msg: T) -> Self {
		Response {
			code: StatusCode::SERVICE_UNAVAILABLE,
			content_type: HeaderValue::from_static("application/json; charset=utf-8"),
			content: msg.into(),
		}
	}

	/// Create a response for not allowed hosts.
	pub fn host_not_allowed() -> Self {
		Response {
			code: StatusCode::FORBIDDEN,
			content_type: plain_text(),
			content: "Provided Host header is not whitelisted.\n".to_owned(),
		}
	}

	/// Create a response for unsupported content type.
	pub fn unsupported_content_type() -> Self {
		Response {
			code: StatusCode::UNSUPPORTED_MEDIA_TYPE,
			content_type: plain_text(),
			content: "Supplied content type is not allowed. Content-Type: application/json is required\n".to_owned(),
		}
	}

	/// Create a response for disallowed method used.
	pub fn method_not_allowed() -> Self {
		Response {
			code: StatusCode::METHOD_NOT_ALLOWED,
			content_type: plain_text(),
			content: "Used HTTP Method is not allowed. POST or OPTIONS is required\n".to_owned(),
		}
	}

	/// CORS invalid
	pub fn invalid_allow_origin() -> Self {
		Response {
			code: StatusCode::FORBIDDEN,
			content_type: plain_text(),
			content: "Origin of the request is not whitelisted. CORS headers would not be sent and any side-effects were cancelled as well.\n".to_owned(),
		}
	}

	/// CORS header invalid
	pub fn invalid_allow_headers() -> Self {
		Response {
			code: StatusCode::FORBIDDEN,
			content_type: plain_text(),
			content: "Requested headers are not allowed for CORS. CORS headers would not be sent and any side-effects were cancelled as well.\n".to_owned(),
		}
	}

	/// Create a response for bad request
	pub fn bad_request<S: Into<String>>(msg: S) -> Self {
		Response {
			code: StatusCode::BAD_REQUEST,
			content_type: plain_text(),
			content: msg.into(),
		}
	}

	/// Create a response for too large (413)
	pub fn too_large<S: Into<String>>(msg: S) -> Self {
		Response {
			code: StatusCode::PAYLOAD_TOO_LARGE,
			content_type: plain_text(),
			content: msg.into(),
		}
	}
}

fn plain_text() -> HeaderValue {
	HeaderValue::from_static("text/plain; charset=utf-8")
}

// TODO: Consider switching to a `TryFrom` conversion once it stabilizes.
impl From<Response> for hyper::Response<Body> {
	/// Converts from a jsonrpc `Response` to a `hyper::Response`
	///
	/// ## Panics
	///
	/// Panics if the response cannot be converted due to failure to parse
	/// body content.
	///
	fn from(res: Response) -> hyper::Response<Body> {
		hyper::Response::builder()
			.status(res.code)
			.header("content-type", res.content_type)
			.body(res.content.into())
			// Parsing `StatusCode` and `HeaderValue` is infalliable but
			// parsing body content is not.
			.expect("Unable to parse response body for type conversion")
	}
}