webdav-handler 0.2.0

handler for the HTTP and Webdav protocols with filesystem backend
Documentation 
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

use futures::{future::BoxFuture, FutureExt, StreamExt};
use headers::HeaderMapExt;
use http::{Request, Response, StatusCode};

use crate::async_stream::AsyncStream;
use crate::body::Body;
use crate::conditional::if_match_get_tokens;
use crate::davheaders::Depth;
use crate::davpath::DavPath;
use crate::errors::*;
use crate::fs::*;
use crate::multierror::{multi_error, MultiError};
use crate::DavResult;

// map_err helper.
async fn add_status<'a>(m_err: &'a mut MultiError, path: &'a DavPath, e: FsError) -> DavError {
    let status = DavError::FsError(e).statuscode();
    if let Err(x) = m_err.add_status(path, status).await {
        return x.into();
    }
    DavError::Status(status)
}

// map_err helper for directories, the result statuscode
// mappings are not 100% the same.
async fn dir_status<'a>(res: &'a mut MultiError, path: &'a DavPath, e: FsError) -> DavError {
    let status = match e {
        FsError::Exists => StatusCode::CONFLICT,
        e => DavError::FsError(e).statuscode(),
    };
    if let Err(x) = res.add_status(path, status).await {
        return x.into();
    }
    DavError::Status(status)
}

impl crate::DavInner {
    pub(crate) fn delete_items<'a>(
        &'a self,
        mut res: &'a mut MultiError,
        depth: Depth,
        meta: Box<dyn DavMetaData + 'a>,
        path: &'a DavPath,
    ) -> BoxFuture<'a, DavResult<()>>
    {
        async move {
            if !meta.is_dir() {
                trace!("delete_items (file) {} {:?}", path, depth);
                return match self.fs.remove_file(path).await {
                    Ok(x) => Ok(x),
                    Err(e) => Err(add_status(&mut res, path, e).await),
                };
            }
            if depth == Depth::Zero {
                trace!("delete_items (dir) {} {:?}", path, depth);
                return match self.fs.remove_dir(path).await {
                    Ok(x) => Ok(x),
                    Err(e) => Err(add_status(&mut res, path, e).await),
                };
            }

            // walk over all entries.
            let mut entries = match self.fs.read_dir(path, ReadDirMeta::DataSymlink).await {
                Ok(x) => Ok(x),
                Err(e) => Err(add_status(&mut res, path, e).await),
            }?;

            let mut result = Ok(());
            while let Some(dirent) = entries.next().await {
                // if metadata() fails, skip to next entry.
                // NOTE: dirent.metadata == symlink_metadata (!)
                let meta = match dirent.metadata().await {
                    Ok(m) => m,
                    Err(e) => {
                        result = Err(add_status(&mut res, path, e).await);
                        continue;
                    },
                };

                let mut npath = path.clone();
                npath.push_segment(&dirent.name());
                npath.add_slash_if(meta.is_dir());

                // do the actual work. If this fails with a non-fs related error,
                // return immediately.
                if let Err(e) = self.delete_items(&mut res, depth, meta, &npath).await {
                    match e {
                        DavError::Status(_) => {
                            result = Err(e);
                            continue;
                        },
                        _ => return Err(e),
                    }
                }
            }

            // if we got any error, return with the error,
            // and do not try to remove the directory.
            result?;

            match self.fs.remove_dir(path).await {
                Ok(x) => Ok(x),
                Err(e) => Err(dir_status(&mut res, path, e).await),
            }
        }
        .boxed()
    }

    pub(crate) async fn handle_delete(self, req: &Request<()>) -> DavResult<Response<Body>> {
        // RFC4918 9.6.1 DELETE for Collections.
        // Note that allowing Depth: 0 is NOT RFC compliant.
        let depth = match req.headers().typed_get::<Depth>() {
            Some(Depth::Infinity) | None => Depth::Infinity,
            Some(Depth::Zero) => Depth::Zero,
            _ => return Err(DavError::Status(StatusCode::BAD_REQUEST)),
        };

        let mut path = self.path(&req);
        let meta = self.fs.symlink_metadata(&path).await?;
        if meta.is_symlink() {
            if let Ok(m2) = self.fs.metadata(&path).await {
                path.add_slash_if(m2.is_dir());
            }
        }
        path.add_slash_if(meta.is_dir());

        // check the If and If-* headers.
        let tokens_res = if_match_get_tokens(&req, Some(&meta), &self.fs, &self.ls, &path).await;
        let tokens = match tokens_res {
            Ok(t) => t,
            Err(s) => return Err(DavError::Status(s)),
        };

        // check locks. since we cancel the entire operation if there is
        // a conflicting lock, we do not return a 207 multistatus, but
        // just a simple status.
        if let Some(ref locksystem) = self.ls {
            let t = tokens.iter().map(|s| s.as_str()).collect::<Vec<&str>>();
            let principal = self.principal.as_ref().map(|s| s.as_str());
            if let Err(_l) = locksystem.check(&path, principal, false, true, t) {
                return Err(DavError::Status(StatusCode::LOCKED));
            }
        }

        let req_path = path.clone();

        let items = AsyncStream::new(|tx| {
            async move {
                // turn the Sink into something easier to pass around.
                let mut multierror = MultiError::new(tx);

                // now delete the path recursively.
                let fut = self.delete_items(&mut multierror, depth, meta, &path);
                if let Ok(()) = fut.await {
                    // Done. Now delete the path in the locksystem as well.
                    // Should really do this per resource, in case the delete partially fails. See TODO.pm
                    if let Some(ref locksystem) = self.ls {
                        locksystem.delete(&path).ok();
                    }
                    let _ = multierror.add_status(&path, StatusCode::NO_CONTENT).await;
                }
                Ok(())
            }
        });

        multi_error(req_path, items).await
    }
}