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
use crate::{Ctx, Error, manifest, util::Sha256};
use anyhow::Context as _;
use camino::Utf8PathBuf as PathBuf;
use std::sync::Arc;
#[derive(Debug)]
struct Cab {
filename: PathBuf,
sha256: Sha256,
url: String,
#[allow(dead_code)]
size: u64,
}
pub(crate) struct CabContents {
pub(crate) path: PathBuf,
pub(crate) content: bytes::Bytes,
pub(crate) sequence: u32,
}
pub(crate) enum PayloadContents {
Vsix(bytes::Bytes),
Msi {
msi: bytes::Bytes,
cabs: Vec<CabContents>,
},
}
pub(crate) fn download(
ctx: Arc<Ctx>,
pkgs: Arc<std::collections::BTreeMap<String, manifest::ManifestItem>>,
item: &crate::WorkItem,
) -> Result<Option<PayloadContents>, Error> {
item.progress.set_message("📥 downloading..");
let contents = ctx.get_and_validate(
&item.payload.url,
&item.payload.filename,
Some(item.payload.sha256.clone()),
item.progress.clone(),
)?;
let pc = match item.payload.filename.extension() {
Some("msi") => {
let cabs: Vec<_> = match pkgs.values().find(|mi| {
mi.payloads
.iter()
.any(|mi_payload| mi_payload.sha256 == item.payload.sha256)
}) {
Some(mi) => mi
.payloads
.iter()
.filter(|pay| pay.file_name.ends_with(".cab"))
.map(|pay| Cab {
filename: pay
.file_name
.strip_prefix("Installers")
// v18 now includes files that have correct path separators, so we just skip the path separator
// regardless of it it's forward or backwards, and hope that MS doesn't decide to start naming
// stuff with Installers as a prefix instead of a directory name
.map_or(pay.file_name.as_str(), |s| &s[1..])
.into(),
sha256: pay.sha256.clone(),
url: pay.url.clone(),
size: pay.size,
})
.collect(),
None => anyhow::bail!(
"unable to find manifest parent for {}",
item.payload.filename
),
};
download_cabs(ctx, &cabs, item, contents)
}
Some("vsix") => Ok(Some(PayloadContents::Vsix(contents))),
ext => anyhow::bail!("unknown extension {ext:?}"),
};
item.progress.finish_with_message("downloaded");
pc
}
/// Each SDK MSI has 1 or more cab files associated with it containing the actual
/// data we need that must be downloaded separately and indexed from the MSI
fn download_cabs(
ctx: Arc<Ctx>,
cabs: &[Cab],
msi: &crate::WorkItem,
msi_content: bytes::Bytes,
) -> Result<Option<PayloadContents>, Error> {
use rayon::prelude::*;
let msi_filename = &msi.payload.filename;
let mut msi_pkg = msi::Package::open(std::io::Cursor::new(msi_content.clone()))
.with_context(|| format!("invalid MSI for {msi_filename}"))?;
// The `Media` table contains the list of cabs by name, which we then need
// to lookup in the list of payloads.
// Columns: [DiskId, LastSequence, DiskPrompt, Cabinet, VolumeLabel, Source]
let cab_files: Vec<_> = msi_pkg
.select_rows(msi::Select::table("Media"))
.with_context(|| format!("{msi_filename} does not contain a list of CAB files"))?
.filter_map(|row| {
// Columns:
// 0 - DiskId
// 1 - LastSequence
// 2 - DiskPrompt
// 3 - Cabinet name
// ...
if row.len() >= 3 {
// For some reason most/all of the msi files contain a NULL cabinet
// in the first position which is useless
row[3]
.as_str()
.and_then(|s| row[1].as_int().map(|seq| (s, seq as u32)))
.and_then(|(name, seq)| {
let cab_name = name.trim_matches('"');
cabs.iter().find_map(|payload| {
(payload.filename == cab_name).then(|| {
(
PathBuf::from(format!(
"{}/{cab_name}",
msi_filename.file_stem().unwrap(),
)),
payload.sha256.clone(),
payload.url.clone(),
seq,
)
})
})
})
} else {
None
}
})
.collect();
if cab_files.is_empty() {
return Ok(None);
}
let cabs = cab_files
.into_par_iter()
.map(
|(cab_name, chksum, url, sequence)| -> Result<CabContents, Error> {
let cab_contents =
ctx.get_and_validate(url, &cab_name, Some(chksum), msi.progress.clone())?;
Ok(CabContents {
path: cab_name,
content: cab_contents,
sequence,
})
},
)
.collect::<Result<Vec<_>, _>>()?;
Ok(Some(PayloadContents::Msi {
msi: msi_content,
cabs,
}))
}