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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
//! HTTP response builder.

use std::{cell::RefCell, fmt, str};

use crate::{
    body::{EitherBody, MessageBody},
    error::{Error, HttpError},
    header::{self, TryIntoHeaderPair, TryIntoHeaderValue},
    responses::{BoxedResponseHead, ResponseHead},
    ConnectionType, Extensions, Response, StatusCode,
};

/// An HTTP response builder.
///
/// Used to construct an instance of `Response` using a builder pattern. Response builders are often
/// created using [`Response::build`].
///
/// # Examples
/// ```
/// use actix_http::{Response, ResponseBuilder, StatusCode, body, header};
///
/// # actix_rt::System::new().block_on(async {
/// let mut res: Response<_> = Response::build(StatusCode::OK)
///     .content_type(mime::APPLICATION_JSON)
///     .insert_header((header::SERVER, "my-app/1.0"))
///     .append_header((header::SET_COOKIE, "a=1"))
///     .append_header((header::SET_COOKIE, "b=2"))
///     .body("1234");
///
/// assert_eq!(res.status(), StatusCode::OK);
///
/// assert!(res.headers().contains_key("server"));
/// assert_eq!(res.headers().get_all("set-cookie").count(), 2);
///
/// assert_eq!(body::to_bytes(res.into_body()).await.unwrap(), &b"1234"[..]);
/// # })
/// ```
pub struct ResponseBuilder {
    head: Option<BoxedResponseHead>,
    err: Option<HttpError>,
}

impl ResponseBuilder {
    /// Create response builder
    ///
    /// # Examples
    /// ```
    /// use actix_http::{Response, ResponseBuilder, StatusCode};
    /// let res: Response<_> = ResponseBuilder::default().finish();
    /// assert_eq!(res.status(), StatusCode::OK);
    /// ```
    #[inline]
    pub fn new(status: StatusCode) -> Self {
        ResponseBuilder {
            head: Some(BoxedResponseHead::new(status)),
            err: None,
        }
    }

    /// Set HTTP status code of this response.
    ///
    /// # Examples
    /// ```
    /// use actix_http::{ResponseBuilder, StatusCode};
    /// let res = ResponseBuilder::default().status(StatusCode::NOT_FOUND).finish();
    /// assert_eq!(res.status(), StatusCode::NOT_FOUND);
    /// ```
    #[inline]
    pub fn status(&mut self, status: StatusCode) -> &mut Self {
        if let Some(parts) = self.inner() {
            parts.status = status;
        }
        self
    }

    /// Insert a header, replacing any that were set with an equivalent field name.
    ///
    /// # Examples
    /// ```
    /// use actix_http::{ResponseBuilder, header};
    ///
    /// let res = ResponseBuilder::default()
    ///     .insert_header((header::CONTENT_TYPE, mime::APPLICATION_JSON))
    ///     .insert_header(("X-TEST", "value"))
    ///     .finish();
    ///
    /// assert!(res.headers().contains_key("content-type"));
    /// assert!(res.headers().contains_key("x-test"));
    /// ```
    pub fn insert_header(&mut self, header: impl TryIntoHeaderPair) -> &mut Self {
        if let Some(parts) = self.inner() {
            match header.try_into_pair() {
                Ok((key, value)) => {
                    parts.headers.insert(key, value);
                }
                Err(err) => self.err = Some(err.into()),
            };
        }

        self
    }

    /// Append a header, keeping any that were set with an equivalent field name.
    ///
    /// # Examples
    /// ```
    /// use actix_http::{ResponseBuilder, header};
    ///
    /// let res = ResponseBuilder::default()
    ///     .append_header((header::CONTENT_TYPE, mime::APPLICATION_JSON))
    ///     .append_header(("X-TEST", "value1"))
    ///     .append_header(("X-TEST", "value2"))
    ///     .finish();
    ///
    /// assert_eq!(res.headers().get_all("content-type").count(), 1);
    /// assert_eq!(res.headers().get_all("x-test").count(), 2);
    /// ```
    pub fn append_header(&mut self, header: impl TryIntoHeaderPair) -> &mut Self {
        if let Some(parts) = self.inner() {
            match header.try_into_pair() {
                Ok((key, value)) => parts.headers.append(key, value),
                Err(err) => self.err = Some(err.into()),
            };
        }

        self
    }

    /// Set the custom reason for the response.
    #[inline]
    pub fn reason(&mut self, reason: &'static str) -> &mut Self {
        if let Some(parts) = self.inner() {
            parts.reason = Some(reason);
        }
        self
    }

    /// Set connection type to KeepAlive
    #[inline]
    pub fn keep_alive(&mut self) -> &mut Self {
        if let Some(parts) = self.inner() {
            parts.set_connection_type(ConnectionType::KeepAlive);
        }
        self
    }

    /// Set connection type to `Upgrade`.
    #[inline]
    pub fn upgrade<V>(&mut self, value: V) -> &mut Self
    where
        V: TryIntoHeaderValue,
    {
        if let Some(parts) = self.inner() {
            parts.set_connection_type(ConnectionType::Upgrade);
        }

        if let Ok(value) = value.try_into_value() {
            self.insert_header((header::UPGRADE, value));
        }

        self
    }

    /// Force-close connection, even if it is marked as keep-alive.
    #[inline]
    pub fn force_close(&mut self) -> &mut Self {
        if let Some(parts) = self.inner() {
            parts.set_connection_type(ConnectionType::Close);
        }
        self
    }

    /// Disable chunked transfer encoding for HTTP/1.1 streaming responses.
    #[inline]
    pub fn no_chunking(&mut self, len: u64) -> &mut Self {
        let mut buf = itoa::Buffer::new();
        self.insert_header((header::CONTENT_LENGTH, buf.format(len)));

        if let Some(parts) = self.inner() {
            parts.no_chunking(true);
        }
        self
    }

    /// Set response content type.
    #[inline]
    pub fn content_type<V>(&mut self, value: V) -> &mut Self
    where
        V: TryIntoHeaderValue,
    {
        if let Some(parts) = self.inner() {
            match value.try_into_value() {
                Ok(value) => {
                    parts.headers.insert(header::CONTENT_TYPE, value);
                }
                Err(err) => self.err = Some(err.into()),
            };
        }
        self
    }

    /// Generate response with a wrapped body.
    ///
    /// This `ResponseBuilder` will be left in a useless state.
    pub fn body<B>(&mut self, body: B) -> Response<EitherBody<B>>
    where
        B: MessageBody + 'static,
    {
        match self.message_body(body) {
            Ok(res) => res.map_body(|_, body| EitherBody::left(body)),
            Err(err) => Response::from(err).map_body(|_, body| EitherBody::right(body)),
        }
    }

    /// Generate response with a body.
    ///
    /// This `ResponseBuilder` will be left in a useless state.
    pub fn message_body<B>(&mut self, body: B) -> Result<Response<B>, Error> {
        if let Some(err) = self.err.take() {
            return Err(Error::new_http().with_cause(err));
        }

        let head = self.head.take().expect("cannot reuse response builder");

        Ok(Response {
            head,
            body,
            extensions: RefCell::new(Extensions::new()),
        })
    }

    /// Generate response with an empty body.
    ///
    /// This `ResponseBuilder` will be left in a useless state.
    #[inline]
    pub fn finish(&mut self) -> Response<EitherBody<()>> {
        self.body(())
    }

    /// Create an owned `ResponseBuilder`, leaving the original in a useless state.
    pub fn take(&mut self) -> ResponseBuilder {
        ResponseBuilder {
            head: self.head.take(),
            err: self.err.take(),
        }
    }

    /// Get access to the inner response head if there has been no error.
    fn inner(&mut self) -> Option<&mut ResponseHead> {
        if self.err.is_some() {
            return None;
        }

        self.head.as_deref_mut()
    }
}

impl Default for ResponseBuilder {
    fn default() -> Self {
        Self::new(StatusCode::OK)
    }
}

/// Convert `Response` to a `ResponseBuilder`. Body get dropped.
impl<B> From<Response<B>> for ResponseBuilder {
    fn from(res: Response<B>) -> ResponseBuilder {
        ResponseBuilder {
            head: Some(res.head),
            err: None,
        }
    }
}

/// Convert `ResponseHead` to a `ResponseBuilder`
impl<'a> From<&'a ResponseHead> for ResponseBuilder {
    fn from(head: &'a ResponseHead) -> ResponseBuilder {
        let mut msg = BoxedResponseHead::new(head.status);
        msg.version = head.version;
        msg.reason = head.reason;

        for (k, v) in head.headers.iter() {
            msg.headers.append(k.clone(), v.clone());
        }

        msg.no_chunking(!head.chunked());

        ResponseBuilder {
            head: Some(msg),
            err: None,
        }
    }
}

impl fmt::Debug for ResponseBuilder {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let head = self.head.as_ref().unwrap();

        let res = writeln!(
            f,
            "\nResponseBuilder {:?} {}{}",
            head.version,
            head.status,
            head.reason.unwrap_or(""),
        );
        let _ = writeln!(f, "  headers:");
        for (key, val) in head.headers.iter() {
            let _ = writeln!(f, "    {:?}: {:?}", key, val);
        }
        res
    }
}

#[cfg(test)]
mod tests {
    use bytes::Bytes;

    use super::*;
    use crate::header::{HeaderName, HeaderValue, CONTENT_TYPE};

    #[test]
    fn test_basic_builder() {
        let resp = Response::build(StatusCode::OK)
            .insert_header(("X-TEST", "value"))
            .finish();
        assert_eq!(resp.status(), StatusCode::OK);
    }

    #[test]
    fn test_upgrade() {
        let resp = Response::build(StatusCode::OK)
            .upgrade("websocket")
            .finish();
        assert!(resp.upgrade());
        assert_eq!(
            resp.headers().get(header::UPGRADE).unwrap(),
            HeaderValue::from_static("websocket")
        );
    }

    #[test]
    fn test_force_close() {
        let resp = Response::build(StatusCode::OK).force_close().finish();
        assert!(!resp.keep_alive());
    }

    #[test]
    fn test_content_type() {
        let resp = Response::build(StatusCode::OK)
            .content_type("text/plain")
            .body(Bytes::new());
        assert_eq!(resp.headers().get(CONTENT_TYPE).unwrap(), "text/plain");

        let resp = Response::build(StatusCode::OK)
            .content_type(mime::APPLICATION_JAVASCRIPT_UTF_8)
            .body(Bytes::new());
        assert_eq!(
            resp.headers().get(CONTENT_TYPE).unwrap(),
            "application/javascript; charset=utf-8"
        );
    }

    #[test]
    fn test_into_builder() {
        let mut resp: Response<_> = "test".into();
        assert_eq!(resp.status(), StatusCode::OK);

        resp.headers_mut().insert(
            HeaderName::from_static("cookie"),
            HeaderValue::from_static("cookie1=val100"),
        );

        let mut builder: ResponseBuilder = resp.into();
        let resp = builder.status(StatusCode::BAD_REQUEST).finish();
        assert_eq!(resp.status(), StatusCode::BAD_REQUEST);

        let cookie = resp.headers().get_all("Cookie").next().unwrap();
        assert_eq!(cookie.to_str().unwrap(), "cookie1=val100");
    }

    #[test]
    fn response_builder_header_insert_kv() {
        let mut res = Response::build(StatusCode::OK);
        res.insert_header(("Content-Type", "application/octet-stream"));
        let res = res.finish();

        assert_eq!(
            res.headers().get("Content-Type"),
            Some(&HeaderValue::from_static("application/octet-stream"))
        );
    }

    #[test]
    fn response_builder_header_insert_typed() {
        let mut res = Response::build(StatusCode::OK);
        res.insert_header((header::CONTENT_TYPE, mime::APPLICATION_OCTET_STREAM));
        let res = res.finish();

        assert_eq!(
            res.headers().get("Content-Type"),
            Some(&HeaderValue::from_static("application/octet-stream"))
        );
    }

    #[test]
    fn response_builder_header_append_kv() {
        let mut res = Response::build(StatusCode::OK);
        res.append_header(("Content-Type", "application/octet-stream"));
        res.append_header(("Content-Type", "application/json"));
        let res = res.finish();

        let headers: Vec<_> = res.headers().get_all("Content-Type").cloned().collect();
        assert_eq!(headers.len(), 2);
        assert!(headers.contains(&HeaderValue::from_static("application/octet-stream")));
        assert!(headers.contains(&HeaderValue::from_static("application/json")));
    }

    #[test]
    fn response_builder_header_append_typed() {
        let mut res = Response::build(StatusCode::OK);
        res.append_header((header::CONTENT_TYPE, mime::APPLICATION_OCTET_STREAM));
        res.append_header((header::CONTENT_TYPE, mime::APPLICATION_JSON));
        let res = res.finish();

        let headers: Vec<_> = res.headers().get_all("Content-Type").cloned().collect();
        assert_eq!(headers.len(), 2);
        assert!(headers.contains(&HeaderValue::from_static("application/octet-stream")));
        assert!(headers.contains(&HeaderValue::from_static("application/json")));
    }
}