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

//! [`HeadBucket`](https://docs.aws.amazon.com/AmazonS3/latest/API/API_HeadBucket.html)

use super::{ReqContext, S3Handler};

use crate::dto::{HeadBucketError, HeadBucketOutput, HeadBucketRequest};
use crate::errors::{S3Error, S3ErrorCode, S3Result};
use crate::headers::X_AMZ_EXPECTED_BUCKET_OWNER;
use crate::output::S3Output;
use crate::storage::S3Storage;
use crate::utils::Apply;
use crate::{async_trait, Body, Method, Response};

/// `HeadBucket` handler
pub struct Handler;

#[async_trait]
impl S3Handler for Handler {
    fn is_match(&self, ctx: &'_ ReqContext<'_>) -> bool {
        bool_try!(ctx.req.method() == Method::HEAD);
        ctx.path.is_bucket()
    }

    async fn handle(
        &self,
        ctx: &mut ReqContext<'_>,
        storage: &(dyn S3Storage + Send + Sync),
    ) -> S3Result<Response> {
        let input = extract(ctx)?;
        let output = storage.head_bucket(input).await;
        output.try_into_response()
    }
}

/// extract operation request
fn extract(ctx: &mut ReqContext<'_>) -> S3Result<HeadBucketRequest> {
    let bucket = ctx.unwrap_bucket_path();

    let mut input = HeadBucketRequest {
        bucket: bucket.into(),
        expected_bucket_owner: None,
    };

    let h = &ctx.headers;
    h.assign_str(
        &*X_AMZ_EXPECTED_BUCKET_OWNER,
        &mut input.expected_bucket_owner,
    );

    Ok(input)
}

impl S3Output for HeadBucketOutput {
    fn try_into_response(self) -> S3Result<Response> {
        Response::new(Body::empty()).apply(Ok)
    }
}

impl From<HeadBucketError> for S3Error {
    fn from(e: HeadBucketError) -> Self {
        match e {
            HeadBucketError::NoSuchBucket(msg) => Self::new(S3ErrorCode::NoSuchBucket, msg),
        }
    }
}