gate4agent 0.4.5

Transport library for CLI AI agents — first tier: Claude Code, Codex, Kimi, Grok. Pipe, PTY, ACP (Agent Client Protocol), and Daemon transports.
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

//! Minimal inherited environment for native provider children.

use std::ffi::{OsStr, OsString};

#[cfg(windows)]
const PLATFORM_CHILD_ENV_ALLOWLIST: &[&str] = &[
    "SystemDrive",
    "SystemRoot",
    "WINDIR",
    "ComSpec",
    "PATHEXT",
    "PATH",
    "HOME",
    "USERPROFILE",
    "APPDATA",
    "LOCALAPPDATA",
    "TEMP",
    "TMP",
    "ProgramFiles",
    "ProgramFiles(x86)",
    "ProgramW6432",
    "CommonProgramFiles",
    "CommonProgramFiles(x86)",
    "CommonProgramW6432",
    "PSModulePath",
];

#[cfg(not(windows))]
const PLATFORM_CHILD_ENV_ALLOWLIST: &[&str] = &[
    "PATH",
    "HOME",
    "USER",
    "LOGNAME",
    "SHELL",
    "TMPDIR",
    "LANG",
    "XDG_CONFIG_HOME",
    "XDG_CACHE_HOME",
    "XDG_DATA_HOME",
    "XDG_RUNTIME_DIR",
];

pub(crate) fn is_platform_child_environment_key(key: &OsStr) -> bool {
    let Some(key) = key.to_str() else {
        return false;
    };
    #[cfg(windows)]
    {
        PLATFORM_CHILD_ENV_ALLOWLIST
            .iter()
            .any(|allowed| key.eq_ignore_ascii_case(allowed))
    }
    #[cfg(not(windows))]
    {
        PLATFORM_CHILD_ENV_ALLOWLIST.contains(&key) || key.starts_with("LC_")
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn platform_allowlist_preserves_the_proven_pty_baseline() {
        #[cfg(windows)]
        assert_eq!(
            PLATFORM_CHILD_ENV_ALLOWLIST,
            &[
                "SystemDrive",
                "SystemRoot",
                "WINDIR",
                "ComSpec",
                "PATHEXT",
                "PATH",
                "HOME",
                "USERPROFILE",
                "APPDATA",
                "LOCALAPPDATA",
                "TEMP",
                "TMP",
                "ProgramFiles",
                "ProgramFiles(x86)",
                "ProgramW6432",
                "CommonProgramFiles",
                "CommonProgramFiles(x86)",
                "CommonProgramW6432",
                "PSModulePath",
            ]
        );
        #[cfg(not(windows))]
        {
            assert_eq!(
                PLATFORM_CHILD_ENV_ALLOWLIST,
                &[
                    "PATH",
                    "HOME",
                    "USER",
                    "LOGNAME",
                    "SHELL",
                    "TMPDIR",
                    "LANG",
                    "XDG_CONFIG_HOME",
                    "XDG_CACHE_HOME",
                    "XDG_DATA_HOME",
                    "XDG_RUNTIME_DIR",
                ]
            );
            assert!(is_platform_child_environment_key(OsStr::new("LC_MESSAGES")));
        }
    }
}

/// Returns the machine-local variables required to locate executables, user
/// configuration, and temporary storage. Provider credentials, proxy state,
/// SSH agents, and unrelated daemon variables are excluded.
pub fn platform_minimal_child_environment() -> Vec<(OsString, OsString)> {
    platform_minimal_child_environment_from(std::env::vars_os())
}

pub(crate) fn platform_minimal_child_environment_from<I, K, V>(
    inherited: I,
) -> Vec<(OsString, OsString)>
where
    I: IntoIterator<Item = (K, V)>,
    K: AsRef<OsStr>,
    V: AsRef<OsStr>,
{
    inherited
        .into_iter()
        .filter_map(|(key, value)| {
            is_platform_child_environment_key(key.as_ref()).then(|| {
                (
                    key.as_ref().to_os_string(),
                    value.as_ref().to_os_string(),
                )
            })
        })
        .collect()
}