iron_json_response/
lib.rs

1#[macro_use]
2extern crate mime;
3extern crate iron;
4extern crate serde;
5extern crate serde_json;
6
7use iron::prelude::*;
8use iron::{AfterMiddleware, typemap};
9use iron::modifier::Modifier;
10use iron::headers::ContentType;
11
12use serde::ser::Serialize as ToJson;
13use serde_json::value::{self, Value as Json};
14
15#[derive(Clone)]
16pub struct JsonResponse {
17    value: Json,
18    callback: Option<String>,
19}
20
21impl JsonResponse {
22    pub fn new<T: ToJson>(value: T, callback: Option<String>) -> JsonResponse {
23        JsonResponse {
24            value: value::to_value(&value).unwrap_or(Json::Null),
25            callback: callback,
26        }
27    }
28
29
30    pub fn json<T: ToJson>(value: T) -> JsonResponse {
31        JsonResponse::new(value, None)
32    }
33
34    pub fn jsonp<T: ToJson>(value: T, cb_name: String) -> JsonResponse {
35        JsonResponse::new(value, Some(cb_name))
36    }
37}
38
39
40pub struct JsonResponseMiddleware;
41
42impl JsonResponseMiddleware {
43    pub fn new() -> Self {
44        JsonResponseMiddleware {}
45    }
46}
47
48impl typemap::Key for JsonResponseMiddleware {
49    type Value = JsonResponse;
50}
51
52impl Modifier<Response> for JsonResponse {
53    fn modify(self, resp: &mut Response) {
54        resp.extensions.insert::<JsonResponseMiddleware>(self);
55    }
56}
57
58impl AfterMiddleware for JsonResponseMiddleware {
59    fn after(&self, _: &mut Request, r: Response) -> IronResult<Response> {
60        let mut resp = r;
61        let header_body =
62            resp.extensions
63                .remove::<JsonResponseMiddleware>()
64                .and_then(|j| {
65                    if let Ok(json_string) = serde_json::to_string(&j.value) {
66                        match j.callback {
67                            Some(ref cb) => {
68                                let mut jsonp = String::new();
69                                jsonp.push_str(cb);
70                                jsonp.push('(');
71                                jsonp.push_str(&json_string);
72                                jsonp.push(')');
73                                Some((ContentType(mime!(Text/Javascript; Charset=Utf8)), jsonp))
74                            }
75                            None => Some((ContentType::json(), json_string)),
76                        }
77                    } else {
78                        None
79                    }
80                });
81
82        if let Some((content_type, body)) = header_body {
83            if !resp.headers.has::<ContentType>() {
84                resp.headers.set(content_type);
85            }
86            resp.set_mut(body);
87        }
88        Ok(resp)
89    }
90
91    fn catch(&self, req: &mut Request, mut err: IronError) -> IronResult<Response> {
92        err.response = try!(self.after(req, err.response));
93        Err(err)
94    }
95}
iron_json_response/lib.rs

iron_json_response/
lib.rs
