a941ae7632
## Summary
- Introduces the `codex-execpolicy2` crate.
- This PR covers only the prefix-rule subset of the planned execpolicy
v2 language; a richer language will follow.
## Policy
- Policy language centers on `prefix_rule(pattern=[...], decision?,
match?, not_match?)`, where `pattern` is an ordered list of tokens; any
element may be a list to denote alternatives. `decision` defaults to
`allow`; valid values are `allow`, `prompt`, and `forbidden`. `match` /
`not_match` hold example commands that are tokenized and validated at
load time (think of these as unit tests).
## Policy shapes
- Prefix rules use Starlark syntax:
```starlark
prefix_rule(
pattern = ["cmd", ["alt1", "alt2"]], # ordered tokens; list entries denote alternatives
decision = "prompt", # allow | prompt | forbidden; defaults to allow
match = [["cmd", "alt1"]], # examples that must match this rule (enforced at compile time)
not_match = [["cmd", "oops"]], # examples that must not match this rule (enforced at compile time)
)
```
## Response shapes
- Match:
```json
{
"match": {
"decision": "allow|prompt|forbidden",
"matchedRules": [
{
"prefixRuleMatch": {
"matchedPrefix": ["<token>", "..."],
"decision": "allow|prompt|forbidden"
}
}
]
}
}
```
- No match:
```json
"noMatch"
```
- `matchedRules` lists every rule whose prefix matched the command;
`matchedPrefix` is the exact prefix that matched.
- The effective `decision` is the strictest severity across all matches
(`forbidden` > `prompt` > `allow`).
---------
Co-authored-by: Michael Bolin <mbolin@openai.com>
26 lines
787 B
Rust
26 lines
787 B
Rust
use starlark::Error as StarlarkError;
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use thiserror::Error;
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pub type Result<T> = std::result::Result<T, Error>;
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#[derive(Debug, Error)]
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pub enum Error {
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#[error("invalid decision: {0}")]
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InvalidDecision(String),
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#[error("invalid pattern element: {0}")]
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InvalidPattern(String),
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#[error("invalid example: {0}")]
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InvalidExample(String),
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#[error(
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"expected every example to match at least one rule. rules: {rules:?}; unmatched examples: \
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{examples:?}"
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)]
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ExampleDidNotMatch {
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rules: Vec<String>,
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examples: Vec<String>,
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},
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#[error("expected example to not match rule `{rule}`: {example}")]
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ExampleDidMatch { rule: String, example: String },
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#[error("starlark error: {0}")]
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Starlark(StarlarkError),
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}
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