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

use std::error::Error;
use std::fmt;

use iron::{Request, Response, Handler, IronResult, IronError};
use iron::status;
use iron::method::Method;

type PickerHandlers = Vec<(Option<Method>, Box<Handler>)>;


/// `MethodPicker` provides an interface to apply different handlers for different http methods as
/// middleware for the Iron framework.
pub struct MethodPicker {
	handlers: PickerHandlers
}

impl MethodPicker {
    /// Construct new `MethodPicker`.
    ///
    /// ```
    /// # use iron_mountrouter::MethodPicker;
    /// let picker = MethodPicker::new();
    /// ```
	pub fn new() -> MethodPicker {
		MethodPicker {
			handlers: PickerHandlers::new()
		}
	}
	
	/// Adds new handler to picker
	///
	/// `method` is any Iron's http method.
	///
	/// `handler` will be used for specified method
	pub fn add<H: Handler>(&mut self, method: Method, handler: H) -> &mut MethodPicker {
		self.handlers.push((Some(method), Box::new(handler)));
		self
	}
	
	/// Adds new handler for GET http method to picker
	pub fn get<H: Handler>(&mut self, handler: H) -> &mut MethodPicker {
		self.handlers.push((Some(Method::Get), Box::new(handler)));
		self
	}
	
	/// Adds new handler for POST http method to picker
	pub fn post<H: Handler>(&mut self, handler: H) -> &mut MethodPicker {
		self.handlers.push((Some(Method::Post), Box::new(handler)));
		self
	}
	
	/// Adds new handler for PUT http method to picker
	pub fn put<H: Handler>(&mut self, handler: H) -> &mut MethodPicker {
		self.handlers.push((Some(Method::Put), Box::new(handler)));
		self
	}
	
	/// Adds new handler for DELETE http method to picker
	pub fn delete<H: Handler>(&mut self, handler: H) -> &mut MethodPicker {
		self.handlers.push((Some(Method::Delete), Box::new(handler)));
		self
	}
	
	/// Adds new handler for HEAD http method to picker
	pub fn head<H: Handler>(&mut self, handler: H) -> &mut MethodPicker {
		self.handlers.push((Some(Method::Head), Box::new(handler)));
		self
	}
	
	/// Adds new handler for PATCH http method to picker
	pub fn patch<H: Handler>(&mut self, handler: H) -> &mut MethodPicker {
		self.handlers.push((Some(Method::Patch), Box::new(handler)));
		self
	}
	
	/// Adds new handler for OPTIONS http method to picker
	pub fn options<H: Handler>(&mut self, handler: H) -> &mut MethodPicker {
		self.handlers.push((Some(Method::Options), Box::new(handler)));
		self
	}
	
	/// Adds default handler to picker which will be used if no method matched
	pub fn default<H: Handler>(&mut self, handler: H) -> &mut MethodPicker {
		self.handlers.push((None, Box::new(handler)));
		self
	}
}

impl Handler for MethodPicker {
    fn handle(&self, req: &mut Request) -> IronResult<Response> {
    	for &(ref method, ref handler) in self.handlers.iter() {
    		match method {
    			&Some(ref m) => if *m == req.method {
    				return handler.handle(req);
    			},
    			&None => return handler.handle(req)
    		}
    	}
    	Err(IronError::new(NoMethod, status::NotFound))
    }
}


/// `NoMethod` is error type returned to Iron if no handler was matched in MethodPicker
#[derive(Debug)]
pub struct NoMethod;

impl fmt::Display for NoMethod {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("No matching method found.")
    }
}

impl Error for NoMethod {
    fn description(&self) -> &str { "No method" }
}


/// Create and populate method picker.
///
/// ```ignore
/// let picker = picker!(get => show,
///                      post => save);
/// ```
#[macro_export]
macro_rules! picker {
    ($($method:ident => $handler:expr),+ $(,)*) => ({
        let mut picker = $crate::MethodPicker::new();
        $(picker.$method($handler);)*
        picker
    });
}