safe_chains/targets/
qwen.rs

1use std::path::{Path, PathBuf};
2
3use serde::Deserialize;
4use serde_json::{Map, Value, json};
5
6use super::{HookFormat, HookInput, HookResponse, InstallOutcome, ParseError, Target, allow_reason};
7use crate::verdict::Verdict;
8
9pub struct QwenTarget;
10
11impl Target for QwenTarget {
12    fn name(&self) -> &'static str {
13        "qwen"
14    }
15
16    fn display_name(&self) -> &'static str {
17        "Qwen Code"
18    }
19
20    fn detect_paths(&self, home: &Path) -> Vec<PathBuf> {
21        vec![home.join(".qwen")]
22    }
23
24    fn install(&self, home: &Path) -> Result<InstallOutcome, String> {
25        let dir = home.join(".qwen");
26        if !dir.exists() {
27            return Ok(InstallOutcome::Skipped {
28                reason: format!(
29                    "~/.qwen not found at {} (Qwen Code not installed)",
30                    dir.display()
31                ),
32            });
33        }
34
35        let path = dir.join("settings.json");
36        let binary = "safe-chains hook qwen";
37
38        if path.exists() {
39            let contents = std::fs::read_to_string(&path)
40                .map_err(|e| format!("Could not read {}: {e}", path.display()))?;
41            let mut settings: Value = serde_json::from_str(&contents)
42                .map_err(|e| format!("Could not parse {}: {e}", path.display()))?;
43
44            if has_safe_chains_hook(&settings) {
45                return Ok(InstallOutcome::AlreadyConfigured { path });
46            }
47
48            add_hook(&mut settings, binary);
49            let output = serde_json::to_string_pretty(&settings).expect("serializing valid JSON");
50            std::fs::write(&path, format!("{output}\n"))
51                .map_err(|e| format!("Could not write {}: {e}", path.display()))?;
52            Ok(InstallOutcome::Installed { path })
53        } else {
54            let mut settings = Value::Object(Map::new());
55            add_hook(&mut settings, binary);
56            let output = serde_json::to_string_pretty(&settings).expect("serializing valid JSON");
57            std::fs::write(&path, format!("{output}\n"))
58                .map_err(|e| format!("Could not write {}: {e}", path.display()))?;
59            Ok(InstallOutcome::Installed { path })
60        }
61    }
62
63    fn hook_format(&self) -> Option<&dyn HookFormat> {
64        Some(&QwenHookFormat)
65    }
66}
67
68struct QwenHookFormat;
69
70#[derive(Deserialize)]
71struct ToolInput {
72    command: String,
73}
74
75#[derive(Deserialize)]
76struct QwenHookEnvelope {
77    tool_input: ToolInput,
78    #[serde(default)]
79    cwd: Option<String>,
80}
81
82impl HookFormat for QwenHookFormat {
83    fn parse_input(&self, stdin: &str) -> Result<HookInput, ParseError> {
84        let envelope: QwenHookEnvelope = serde_json::from_str(stdin).map_err(|e| ParseError {
85            message: e.to_string(),
86        })?;
87        Ok(HookInput {
88            command: envelope.tool_input.command,
89            cwd: envelope.cwd,
90        })
91    }
92
93    fn render_response(&self, verdict: Verdict) -> HookResponse {
94        if verdict.is_allowed() {
95            let reason = allow_reason(verdict);
96            // Qwen mirrors Claude Code's hookSpecificOutput envelope.
97            let body = json!({
98                "hookSpecificOutput": {
99                    "hookEventName": "PreToolUse",
100                    "permissionDecision": "allow",
101                    "permissionDecisionReason": reason,
102                }
103            });
104            HookResponse {
105                stdout: serde_json::to_string(&body).unwrap_or_default(),
106                exit_code: 0,
107            }
108        } else {
109            HookResponse {
110                stdout: String::new(),
111                exit_code: 0,
112            }
113        }
114    }
115}
116
117fn hook_entry(binary: &str) -> Value {
118    json!({
119        "matcher": "^Bash$",
120        "hooks": [{
121            "type": "command",
122            "command": binary,
123            "timeout": 60_000,
124        }]
125    })
126}
127
128fn has_safe_chains_hook(settings: &Value) -> bool {
129    settings
130        .get("hooks")
131        .and_then(|h| h.get("PreToolUse"))
132        .and_then(|arr| arr.as_array())
133        .is_some_and(|entries| {
134            entries.iter().any(|entry| {
135                entry
136                    .get("hooks")
137                    .and_then(|h| h.as_array())
138                    .is_some_and(|hooks| {
139                        hooks.iter().any(|hook| {
140                            hook.get("command")
141                                .and_then(|c| c.as_str())
142                                .is_some_and(|cmd| cmd.contains("safe-chains"))
143                        })
144                    })
145            })
146        })
147}
148
149fn add_hook(settings: &mut Value, binary: &str) {
150    if !settings.is_object() {
151        *settings = json!({});
152    }
153    let Some(obj) = settings.as_object_mut() else {
154        unreachable!("settings was just set to an object");
155    };
156    let hooks = obj
157        .entry("hooks")
158        .or_insert_with(|| json!({}))
159        .as_object_mut()
160        .expect("hooks key was created above as an object");
161    let pre_tool_use = hooks
162        .entry("PreToolUse")
163        .or_insert_with(|| json!([]))
164        .as_array_mut()
165        .expect("PreToolUse was created above as an array");
166    pre_tool_use.push(hook_entry(binary));
167}
168
169#[cfg(test)]
170mod tests {
171    use super::*;
172    use crate::verdict::SafetyLevel;
173
174    fn target() -> QwenTarget {
175        QwenTarget
176    }
177
178    /// Verbatim shape from the Qwen Code hooks docs.
179    const QWEN_DOCS_SAMPLE: &str = r#"{
180        "session_id": "abc123",
181        "transcript_path": "/Users/me/.qwen/transcripts/abc.json",
182        "cwd": "/Users/me/project",
183        "hook_event_name": "PreToolUse",
184        "timestamp": "2026-05-06T12:00:00Z",
185        "permission_mode": "default",
186        "tool_name": "Bash",
187        "tool_input": {"command": "ls -la"},
188        "tool_use_id": "tu_123"
189    }"#;
190
191    #[test]
192    fn install_no_qwen_dir_skips() {
193        let dir = tempfile::tempdir().unwrap();
194        let outcome = target().install(dir.path()).unwrap();
195        assert!(matches!(outcome, InstallOutcome::Skipped { .. }));
196    }
197
198    #[test]
199    fn install_creates_settings_file() {
200        let dir = tempfile::tempdir().unwrap();
201        std::fs::create_dir(dir.path().join(".qwen")).unwrap();
202        let outcome = target().install(dir.path()).unwrap();
203        assert!(matches!(outcome, InstallOutcome::Installed { .. }));
204        let contents = std::fs::read_to_string(dir.path().join(".qwen/settings.json")).unwrap();
205        let settings: Value = serde_json::from_str(&contents).unwrap();
206        assert!(has_safe_chains_hook(&settings));
207    }
208
209    #[test]
210    fn install_uses_bash_matcher() {
211        let dir = tempfile::tempdir().unwrap();
212        std::fs::create_dir(dir.path().join(".qwen")).unwrap();
213        target().install(dir.path()).unwrap();
214        let contents = std::fs::read_to_string(dir.path().join(".qwen/settings.json")).unwrap();
215        assert!(contents.contains("^Bash$"));
216        assert!(contents.contains("safe-chains hook qwen"));
217    }
218
219    #[test]
220    fn install_idempotent() {
221        let dir = tempfile::tempdir().unwrap();
222        std::fs::create_dir(dir.path().join(".qwen")).unwrap();
223        target().install(dir.path()).unwrap();
224        let outcome = target().install(dir.path()).unwrap();
225        assert!(matches!(outcome, InstallOutcome::AlreadyConfigured { .. }));
226    }
227
228    #[test]
229    fn parse_input_extracts_command() {
230        let parsed = QwenHookFormat.parse_input(QWEN_DOCS_SAMPLE).unwrap();
231        assert_eq!(parsed.command, "ls -la");
232        assert_eq!(parsed.cwd.as_deref(), Some("/Users/me/project"));
233    }
234
235    #[test]
236    fn parse_input_rejects_garbage() {
237        assert!(QwenHookFormat.parse_input("not json").is_err());
238        assert!(QwenHookFormat.parse_input("{}").is_err());
239    }
240
241    #[test]
242    fn render_response_emits_claude_shaped_envelope() {
243        let r = QwenHookFormat.render_response(Verdict::Allowed(SafetyLevel::Inert));
244        let v: Value = serde_json::from_str(&r.stdout).unwrap();
245        assert_eq!(
246            v.pointer("/hookSpecificOutput/permissionDecision")
247                .and_then(|d| d.as_str()),
248            Some("allow"),
249        );
250        assert_eq!(
251            v.pointer("/hookSpecificOutput/hookEventName")
252                .and_then(|d| d.as_str()),
253            Some("PreToolUse"),
254        );
255    }
256
257    #[test]
258    fn render_response_deny_emits_empty_body() {
259        let r = QwenHookFormat.render_response(Verdict::Denied);
260        assert_eq!(r.stdout, "");
261    }
262}
safe_chains/targets/qwen.rs

safe_chains/targets/
qwen.rs
