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JavaScriptSolidServer/src/handlers/git.js at patchAppend · bourgeoa/JavaScriptSolidServer · GitHub
bourgeoa
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git.js
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269 lines (231 loc) · 8.29 KB
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JavaScriptSolidServer
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src
/
handlers
/
git.js
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import
{
spawn
,
execSync
}
from
'child_process'
;
import
{
existsSync
,
statSync
,
mkdirSync
,
writeFileSync
}
from
'fs'
;
import
{
join
,
resolve
,
dirname
}
from
'path'
;
import
{
getDataRoot
}
from
'../utils/url.js'
;
/**
* Check if a URL path is a Git protocol request
*
@param
{
string
} urlPath - The URL path
*
@returns
{
boolean
}
*/
export
function
isGitRequest
(
urlPath
)
{
return
urlPath
.
includes
(
'/info/refs'
)
||
urlPath
.
includes
(
'/git-upload-pack'
)
||
urlPath
.
includes
(
'/git-receive-pack'
)
;
}
/**
* Determine if this is a write operation (push)
*
@param
{
string
} urlPath - The URL path
*
@returns
{
boolean
}
*/
export
function
isGitWriteOperation
(
urlPath
)
{
return
urlPath
.
includes
(
'/git-receive-pack'
)
||
urlPath
.
includes
(
'service=git-receive-pack'
)
;
}
/**
* Extract the repository path from the URL with path traversal protection
*
@param
{
string
} urlPath - The URL path
*
@returns
{
string|null
} The repository relative path or null
*/
function
extractRepoPath
(
urlPath
)
{
// Remove git service suffixes to get the repo path
let
cleanPath
=
urlPath
.
replace
(
/
\/
i
n
f
o
\/
r
e
f
s
.
*
$
/
,
''
)
.
replace
(
/
\/
g
i
t
-
u
p
l
o
a
d
-
p
a
c
k
$
/
,
''
)
.
replace
(
/
\/
g
i
t
-
r
e
c
e
i
v
e
-
p
a
c
k
$
/
,
''
)
;
// Remove leading slash
cleanPath
=
cleanPath
.
replace
(
/
^
\/
/
,
''
)
;
// Security: remove path traversal attempts (multiple passes for ....// bypass)
let
previous
;
do
{
previous
=
cleanPath
;
cleanPath
=
cleanPath
.
replace
(
/
\.
\.
/
g
,
''
)
;
}
while
(
cleanPath
!==
previous
)
;
// Use '.' for root/empty path
return
cleanPath
===
''
?
'.'
:
cleanPath
;
}
/**
* Validate that a resolved path is within the data root
*
@param
{
string
} resolvedPath - Absolute path to validate
*
@param
{
string
} dataRoot - The data root directory
*
@returns
{
boolean
} - true if path is safe
*/
function
isPathWithinDataRoot
(
resolvedPath
,
dataRoot
)
{
const
normalizedRoot
=
resolve
(
dataRoot
)
;
const
normalizedPath
=
resolve
(
resolvedPath
)
;
return
normalizedPath
.
startsWith
(
normalizedRoot
+
'/'
)
||
normalizedPath
===
normalizedRoot
;
}
/**
* Find the git directory for a path
*
@param
{
string
} repoPath - Absolute path to check
*
@returns
{
{gitDir: string, isRegular: boolean}|null
}
*/
function
findGitDir
(
repoPath
)
{
if
(
!
existsSync
(
repoPath
)
||
!
statSync
(
repoPath
)
.
isDirectory
(
)
)
{
return
null
;
}
// Check for regular repo with .git subdirectory
const
dotGitPath
=
join
(
repoPath
,
'.git'
)
;
if
(
existsSync
(
dotGitPath
)
&&
statSync
(
dotGitPath
)
.
isDirectory
(
)
)
{
return
{
gitDir
:
dotGitPath
,
isRegular
:
true
}
;
}
// Check for bare repository
const
objectsPath
=
join
(
repoPath
,
'objects'
)
;
const
refsPath
=
join
(
repoPath
,
'refs'
)
;
if
(
existsSync
(
objectsPath
)
&&
existsSync
(
refsPath
)
)
{
return
{
gitDir
:
repoPath
,
isRegular
:
false
}
;
}
return
null
;
}
/**
* Handle Git HTTP requests using git http-backend
*
@param
{
FastifyRequest
} request
*
@param
{
FastifyReply
} reply
*/
export
async
function
handleGit
(
request
,
reply
)
{
// Handle CORS preflight
if
(
request
.
method
===
'OPTIONS'
)
{
reply
.
header
(
'Access-Control-Allow-Origin'
,
'*'
)
;
reply
.
header
(
'Access-Control-Allow-Methods'
,
'GET, POST, OPTIONS'
)
;
reply
.
header
(
'Access-Control-Allow-Headers'
,
'Content-Type, Authorization'
)
;
return
reply
.
code
(
200
)
.
send
(
)
;
}
const
urlPath
=
decodeURIComponent
(
request
.
url
.
split
(
'?'
)
[
0
]
)
;
const
queryString
=
request
.
url
.
split
(
'?'
)
[
1
]
||
''
;
// Extract repository path
const
repoRelative
=
extractRepoPath
(
urlPath
)
;
if
(
!
repoRelative
)
{
return
reply
.
code
(
400
)
.
send
(
{
error
:
'Invalid git request'
}
)
;
}
// Handle subdomain mode
let
dataRoot
=
getDataRoot
(
)
;
if
(
request
.
podName
)
{
dataRoot
=
join
(
dataRoot
,
request
.
podName
)
;
}
const
repoAbs
=
resolve
(
dataRoot
,
repoRelative
)
;
// Security: verify resolved path is within data root (path traversal protection)
if
(
!
isPathWithinDataRoot
(
repoAbs
,
getDataRoot
(
)
)
)
{
return
reply
.
code
(
403
)
.
send
(
{
error
:
'Path traversal detected'
}
)
;
}
// Find git directory
const
gitInfo
=
findGitDir
(
repoAbs
)
;
if
(
!
gitInfo
)
{
return
reply
.
code
(
404
)
.
send
(
{
error
:
'Not a git repository'
}
)
;
}
// Auto-configure repos to accept pushes (check full URL for query string)
if
(
isGitWriteOperation
(
request
.
url
)
)
{
try
{
// Enable receive-pack for HTTP push
execSync
(
'git config http.receivepack true'
,
{
cwd
:
repoAbs
,
env
:
{
...
process
.
env
,
GIT_DIR
:
gitInfo
.
gitDir
}
}
)
;
// For non-bare repos, auto-update working directory after push
if
(
gitInfo
.
isRegular
)
{
execSync
(
'git config receive.denyCurrentBranch updateInstead'
,
{
cwd
:
repoAbs
,
env
:
{
...
process
.
env
,
GIT_DIR
:
gitInfo
.
gitDir
}
}
)
;
}
}
catch
(
e
)
{
// Ignore config errors - repo may still work
}
}
// Build CGI environment
const
env
=
{
...
process
.
env
,
GIT_PROJECT_ROOT
:
dataRoot
,
GIT_HTTP_EXPORT_ALL
:
''
,
// Allow read access
GIT_HTTP_RECEIVE_PACK
:
'true'
,
// Enable push
GIT_CONFIG_PARAMETERS
:
"'uploadpack.allowTipSHA1InWant=true'"
,
PATH_INFO
:
urlPath
,
REQUEST_METHOD
:
request
.
method
,
CONTENT_TYPE
:
request
.
headers
[
'content-type'
]
||
''
,
QUERY_STRING
:
queryString
,
REMOTE_USER
:
request
.
webId
||
''
,
// Pass authenticated user
CONTENT_LENGTH
:
request
.
headers
[
'content-length'
]
||
'0'
,
}
;
// For regular repositories, set GIT_DIR
if
(
gitInfo
.
isRegular
)
{
env
.
GIT_DIR
=
gitInfo
.
gitDir
;
}
// Spawn git http-backend
return
new
Promise
(
(
resolve
,
reject
)
=>
{
const
child
=
spawn
(
'git'
,
[
'http-backend'
]
,
{
env
}
)
;
let
buffer
=
Buffer
.
alloc
(
0
)
;
let
headersSent
=
false
;
child
.
stdout
.
on
(
'data'
,
(
data
)
=>
{
buffer
=
Buffer
.
concat
(
[
buffer
,
data
]
)
;
if
(
!
headersSent
)
{
// Look for end of CGI headers (try both \r\n\r\n and \n\n)
let
headerEnd
=
buffer
.
indexOf
(
'\r\n\r\n'
)
;
let
headerSep
=
'\r\n'
;
let
headerEndLen
=
4
;
if
(
headerEnd
===
-
1
)
{
headerEnd
=
buffer
.
indexOf
(
'\n\n'
)
;
headerSep
=
'\n'
;
headerEndLen
=
2
;
}
if
(
headerEnd
!==
-
1
)
{
const
headerSection
=
buffer
.
subarray
(
0
,
headerEnd
)
.
toString
(
)
;
const
bodySection
=
buffer
.
subarray
(
headerEnd
+
headerEndLen
)
;
// Parse CGI headers and set on raw response
const
lines
=
headerSection
.
split
(
headerSep
)
;
let
statusCode
=
200
;
for
(
const
line
of
lines
)
{
const
colonIndex
=
line
.
indexOf
(
':'
)
;
if
(
colonIndex
>
0
)
{
const
key
=
line
.
substring
(
0
,
colonIndex
)
.
trim
(
)
;
const
value
=
line
.
substring
(
colonIndex
+
1
)
.
trim
(
)
;
// Handle Status header specially
if
(
key
.
toLowerCase
(
)
===
'status'
)
{
statusCode
=
parseInt
(
value
.
split
(
' '
)
[
0
]
,
10
)
;
}
else
{
reply
.
raw
.
setHeader
(
key
,
value
)
;
}
}
}
// Add CORS headers for browser git clients
reply
.
raw
.
setHeader
(
'Access-Control-Allow-Origin'
,
'*'
)
;
reply
.
raw
.
setHeader
(
'Access-Control-Allow-Methods'
,
'GET, POST, OPTIONS'
)
;
reply
.
raw
.
setHeader
(
'Access-Control-Allow-Headers'
,
'Content-Type, Authorization'
)
;
reply
.
raw
.
writeHead
(
statusCode
)
;
headersSent
=
true
;
reply
.
raw
.
write
(
bodySection
)
;
buffer
=
Buffer
.
alloc
(
0
)
;
}
}
else
{
reply
.
raw
.
write
(
buffer
)
;
buffer
=
Buffer
.
alloc
(
0
)
;
}
}
)
;
child
.
stdout
.
on
(
'end'
,
(
)
=>
{
reply
.
raw
.
end
(
)
;
resolve
(
)
;
}
)
;
// Send request body to git
// For POST requests, Fastify has already parsed the body into request.body
if
(
request
.
body
&&
request
.
body
.
length
>
0
)
{
child
.
stdin
.
write
(
request
.
body
)
;
child
.
stdin
.
end
(
)
;
}
else
{
// For GET requests or empty bodies, just close stdin
child
.
stdin
.
end
(
)
;
}
// Log errors
child
.
stderr
.
on
(
'data'
,
(
data
)
=>
{
console
.
error
(
'git http-backend stderr:'
,
data
.
toString
(
)
)
;
}
)
;
child
.
on
(
'error'
,
(
err
)
=>
{
console
.
error
(
'Failed to spawn git http-backend:'
,
err
)
;
if
(
!
headersSent
)
{
reply
.
code
(
500
)
.
send
(
{
error
:
'Git backend error'
}
)
;
}
resolve
(
)
;
}
)
;
child
.
on
(
'close'
,
(
code
)
=>
{
if
(
code
!==
0
&&
!
headersSent
)
{
reply
.
code
(
500
)
.
send
(
{
error
:
'Git operation failed'
}
)
;
}
resolve
(
)
;
}
)
;
}
)
;
}
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