pii-shield-wasi
PII redaction scanner powered by the core Go engine compiled to WebAssembly (WASI). It runs in-process — no network hop — using hybrid heuristic and entropy-based detection.
Installation
pip install pii-shield-wasi
Usage
from pii_shield import PiiShield, PiiShieldConfig
# Initialize the scanner with optional configuration overrides
shield = PiiShield(PiiShieldConfig(
entropy_threshold=4.0,
confidence_score=0.8
))
text = "Connecting to DB with password: MySuperSecretPassword123!"
redacted_text = shield.redact(text)
print(redacted_text)
# Output might redact the high entropy secret based on context
Configuration
PiiShieldConfig accepts these overrides. Any field left unset keeps the core
scanner default, so redaction matches the CLI for the same config.
| Option | Type | Description |
|---|---|---|
entropy_threshold |
float | Shannon entropy cut-off for candidate tokens. |
confidence_score |
float | Hybrid-validation confidence threshold. |
salt |
str | HMAC salt for deterministic [HIDDEN:xxxxxx] tokens. Set it to correlate across processes. |
min_secret_length |
int | Minimum candidate token length before entropy checks apply. |
sensitive_keys |
list[str] | Key names whose values are always redacted (case-insensitive). Replaces the defaults. |
disable_bigram_check |
bool | Disable English bigram analysis (useful for non-English logs). |
adaptive_threshold |
bool | Enable the experimental statistical adaptive-threshold mode. |
entity_type_labels |
bool | Emit [HIDDEN:<type>:<hash>] markers, where <type> names the detector that fired (card, key, context, url, regex, entropy). Off by default; the hash is unchanged. |
sensitive_key_patterns |
list[str] | Regex patterns matched against key names (equivalent to PII_SENSITIVE_KEY_PATTERNS). |
custom_regexes |
list[dict] | Rules forcing redaction: [{"pattern": ..., "name": ...}] (equivalent to PII_CUSTOM_REGEX_LIST). |
safe_regexes |
list[dict] | Whitelist rules exempting matching tokens (equivalent to PII_SAFE_REGEX_LIST). |
fail_policy |
"open" | "closed" |
On an internal error, open returns the input unchanged; closed returns a drop marker. Handled in this wrapper. |
Invalid regex handling
The CLI fails fast on an invalid pattern at startup. The SDK deliberately does
not: an invalid sensitive_key_patterns, custom_regexes, or safe_regexes
entry is ignored and the default is kept, so a bad pattern can never terminate
your Python process. Validate patterns before passing them if you need strictness.
Features
- In-process: runs the Go WASM binary inside Python via Wasmtime — no network hop by construction.
- Low-allocation hot path: the scan loop is optimized to reduce garbage-collection overhead during large log streaming.
- Hybrid scoring: combines static whitelists, regex heuristics, and Shannon entropy, which helps avoid false positives on structured values like UUIDs and IPv6 addresses.
1 maintainer
Metadata
1 maintainer
Release files for pii-shield-wasi 2.2.0
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| File | Size | Uploaded | |
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Built distribution (wheel)
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|---|---|---|---|---|
| pii_shield_wasi-2.2.0-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 2.4 MB
Release files / pii_shield_wasi-2.2.0.tar.gz
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