Bryan Johnson
111be2c744
Shared _sanitize_ctl (unconditional, nc-document) and _sanitize_ctl_tty (strips only when stdout is a terminal) now live in cygwin-safe.sh. nc-msgs, nc-parse, and the hl7-* tools route stdout through the tty-gated variant, so a terminal is protected from raw HL7/NetConfig control bytes while pipes and redirects stay byte-exact (the 0x1c framing route_test needs is preserved). Exit codes propagate via PIPESTATUS. ssh-helper _read_hidden installs its restore trap before stty -echo on every path and saves/restores the prior trap. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
538 lines
18 KiB
Bash
Executable File
538 lines
18 KiB
Bash
Executable File
#!/usr/bin/env bash
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# hl7-sanitize.sh — tokenize PHI fields in HL7 v2 messages.
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#
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# Replaces PHI-likely fields with deterministic local tokens like [[MRN_0001]],
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# [[NAME_0001]], etc. Same value → same token across messages, so analysis
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# downstream can still correlate patients, find duplicates, etc.
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#
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# The token ↔ original mapping is stored LOCAL ONLY at:
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# $LARRY_HOME/sanitize/lookup.tsv (mode 0600)
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#
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# Use hl7-desanitize.sh to reverse the operation when viewing results locally.
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#
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# Usage:
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# hl7-sanitize.sh [FILE] # sanitize file (or stdin); writes lookup
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# hl7-sanitize.sh --strict [FILE] # also tokenize unrecognized Z* segments wholesale
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# hl7-sanitize.sh --no-update-table # use existing tokens; do not create new ones
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# hl7-sanitize.sh --table PATH # use a different lookup table
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# hl7-sanitize.sh --rules-file PATH # override the default PHI rules
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#
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# PHI rule format (one per line):
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# SEGMENT|FIELD_NUM|CATEGORY
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# e.g. PID|3|MRN
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#
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# Subcommands (when first arg is one of these):
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# show-rules print the default PHI-field rules
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# show-table print the current lookup table (PHI in clear — local only)
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# clear-table wipe the table (asks for confirmation)
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# count number of token entries in the table
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set -o pipefail
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NC_SELF="$0"
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NC_LIB_DIR="$(cd "$(dirname "$NC_SELF")" && pwd)"
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LARRY_HOME="${LARRY_HOME:-$HOME/.larry}"
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TABLE_DIR="$LARRY_HOME/sanitize"
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DEFAULT_TABLE="$TABLE_DIR/lookup.tsv"
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# v0.8.26: shared control-byte sanitizer. Sanitized HL7 and the show-table dump
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# echo message/field bytes that can include C0 controls (and 0x1c framing on
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# raw input) that corrupt a terminal when viewed un-redirected. Strip them ONLY
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# when stdout is a tty; on a pipe/redirect (feeding analysis tooling) the bytes
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# pass through raw and byte-identical. See lib/cygwin-safe.sh.
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if [ -r "$NC_LIB_DIR/cygwin-safe.sh" ]; then
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# shellcheck disable=SC1090,SC1091
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. "$NC_LIB_DIR/cygwin-safe.sh"
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else
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_sanitize_ctl_tty() { cat; } # degrade safe: raw passthrough if lib missing
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fi
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die() { printf 'hl7-sanitize: %s\n' "$*" >&2; exit 1; }
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# ─────────────────────────────────────────────────────────────────────────────
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# Default PHI rules — the standard set Bryan can override via --rules-file.
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# Each rule: SEGMENT|FIELD|CATEGORY
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# ─────────────────────────────────────────────────────────────────────────────
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PHI_RULES_DEFAULT='# Patient identification
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PID|2|ALTID
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PID|3|MRN
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PID|4|ALTID
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PID|5|NAME
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PID|6|NAME
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PID|7|DOB
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PID|8|SEX
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PID|9|NAME
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PID|11|ADDR
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PID|12|REGION
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PID|13|PHONE
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PID|14|PHONE
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PID|18|ACCT
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PID|19|SSN
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PID|20|LIC
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PID|21|MRN
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PID|29|DOD
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PID|30|DEATHFLAG
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# Patient visit
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PV1|7|PROV
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PV1|8|PROV
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PV1|9|PROV
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PV1|17|PROV
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PV1|19|VISIT
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PV1|50|VISIT
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PV1|52|PROV
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# Next of kin
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NK1|2|NAME
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NK1|3|RELATIONSHIP
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NK1|4|ADDR
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NK1|5|PHONE
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NK1|6|PHONE
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NK1|16|DOB
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# Guarantor
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GT1|3|NAME
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GT1|4|NAME
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GT1|5|ADDR
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GT1|6|PHONE
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GT1|7|PHONE
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GT1|11|DOB
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GT1|12|SSN
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GT1|19|EMP
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# Insurance
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IN1|16|NAME
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IN1|17|DOB
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IN1|18|NAME
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IN1|19|ADDR
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IN1|20|SSN
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IN1|36|INSPOL
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IN1|49|INSID
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# Observation / orders
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OBR|10|PROV
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OBR|16|PROV
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OBR|32|PROV
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OBX|16|PROV
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DG1|3|DIAG
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DG1|4|DIAG
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# Order Common
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ORC|10|PROV
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ORC|12|PROV'
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cmd_show_rules() { printf '%s\n' "$PHI_RULES_DEFAULT"; }
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cmd_show_table() {
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local table="${1:-$DEFAULT_TABLE}"
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[ -f "$table" ] || { echo "no table at $table"; return 0; }
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cat "$table"
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}
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cmd_clear_table() {
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local table="${1:-$DEFAULT_TABLE}"
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local yes=0; [ "${2:-}" = "--yes" ] && yes=1
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[ -f "$table" ] || { echo "no table at $table"; return 0; }
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if [ "$yes" != "1" ]; then
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printf 'clear lookup table at %s? [y/N]: ' "$table"
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read -r ans </dev/tty || ans=""
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# v0.7.5: strip CR so `Y\r` from a Cygwin pty matches `^[Yy]$`.
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ans="${ans//$'\r'/}"
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[[ "$ans" =~ ^[Yy]$ ]] || { echo "aborted"; return 1; }
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fi
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umask 077
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printf 'token\tcategory\toriginal\n' > "$table"
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chmod 600 "$table"
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echo "cleared $table"
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}
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cmd_count() {
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local table="${1:-$DEFAULT_TABLE}"
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[ -f "$table" ] || { echo 0; return 0; }
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# v0.7.5: strip non-digits at the wc boundary — Cygwin wc.exe CR-taint
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# defense for the surrounding $(( - 1 )) arithmetic.
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local _n; _n=$(wc -l < "$table" | tr -cd '0-9')
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echo $(( ${_n:-0} - 1 ))
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}
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# ─────────────────────────────────────────────────────────────────────────────
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# Auto-category detection + value canonicalization.
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# Canonicalization makes "SMITH^JOHN", "Smith, John", "John Smith", and
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# "JOHN SMITH" all collapse to the same lookup key so they share one token.
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# ─────────────────────────────────────────────────────────────────────────────
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# detect_category VALUE — guess category from value shape.
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# Returns one of: MRN | SSN | DOB | NAME | MANUAL
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detect_category() {
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local v="$1"
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# Trim surrounding whitespace
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v="${v#"${v%%[![:space:]]*}"}"
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v="${v%"${v##*[![:space:]]}"}"
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# Pure digits, 4-15 chars → MRN
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if [[ "$v" =~ ^[0-9]+$ ]] && [ "${#v}" -ge 4 ] && [ "${#v}" -le 15 ]; then
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printf 'MRN'; return
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fi
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# SSN: 9 digits with optional dashes
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if [[ "$v" =~ ^[0-9]{3}-?[0-9]{2}-?[0-9]{4}$ ]]; then
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printf 'SSN'; return
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fi
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# Date-like
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if [[ "$v" =~ ^[0-9]{1,4}[/-][0-9]{1,2}[/-][0-9]{1,4}$ ]]; then
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printf 'DOB'; return
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fi
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# HL7 caret or comma → likely name
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if [[ "$v" == *"^"* ]] || [[ "$v" == *","* ]]; then
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printf 'NAME'; return
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fi
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# Two+ alpha tokens → name
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local word_count
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word_count=$(printf '%s\n' "$v" | awk '{ c=0; for(i=1;i<=NF;i++) if ($i ~ /^[A-Za-z]+$/) c++; print c }')
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if [ "${word_count:-0}" -ge 2 ]; then
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printf 'NAME'; return
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fi
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printf 'MANUAL'
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}
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# normalize_value VALUE CATEGORY — produce canonical lookup key.
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# NAME: lowercase, strip punctuation, sort unique alpha tokens. So
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# "SMITH^JOHN", "Smith, John", "John Smith", "JOHN SMITH" → "john smith"
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# DOB: parse to YYYY-MM-DD if possible (needs GNU date or BSD date)
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# SSN: strip dashes/whitespace
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# MRN/MANUAL: just trim outer whitespace
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normalize_value() {
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local value="$1"
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local category="$2"
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case "$category" in
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NAME)
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printf '%s' "$value" \
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| tr '[:upper:]' '[:lower:]' \
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| tr ',^/' ' ' \
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| tr -cs '[:alnum:]' ' ' \
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| tr ' ' '\n' \
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| grep -E '^[a-z][a-z0-9]*$' \
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| sort -u \
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| tr '\n' ' ' \
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| sed 's/ *$//'
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;;
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DOB)
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local parsed
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parsed=$(date -d "$value" +%Y-%m-%d 2>/dev/null) \
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|| parsed=$(date -j -f "%m/%d/%Y" "$value" +%Y-%m-%d 2>/dev/null) \
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|| parsed=$(date -j -f "%Y-%m-%d" "$value" +%Y-%m-%d 2>/dev/null)
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[ -n "$parsed" ] && printf '%s' "$parsed" || printf '%s' "$value" | tr -d '[:space:]'
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;;
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SSN)
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# Note: '-' must come at the END of the set so BSD tr doesn't treat
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# it as an option flag. Same caveat applies for any future tr -d call.
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printf '%s' "$value" | tr -d '[:space:]-'
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;;
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PHONE)
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# v0.7.3: digits-only canonical so "(555) 123-4567", "5551234567",
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# "555.123.4567", "555-123-4567" all collapse to one token.
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# (Originally added in af2ffe8 — reverted with v0.7.1; re-added per
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# v0.7.3 auto-PHI spec.)
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printf '%s' "$value" | tr -cd '[:digit:]'
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;;
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EMAIL)
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# v0.7.3: lowercase + outer-trim. RFC 5321 says the local-part is
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# technically case-sensitive but in practice every mainstream provider
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# treats it case-insensitively, so collapsing for PHI purposes is safe.
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# (Originally added in af2ffe8 — reverted with v0.7.1; re-added per
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# v0.7.3 auto-PHI spec.)
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printf '%s' "$value" | tr '[:upper:]' '[:lower:]' | awk '{$1=$1; print}'
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;;
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NPI)
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# v0.7.3: National Provider Identifier — 10 digits. Strip whitespace
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# to canonical 10-digit form.
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printf '%s' "$value" | tr -d '[:space:]-'
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;;
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*)
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printf '%s' "$value" | awk '{$1=$1; print}'
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;;
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esac
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}
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# tokenize-value: take a single value (and optional category) and return the
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# existing or newly-created token. Auto-detects category if not given. Uses
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# canonicalized form as the lookup key so name variants share one token.
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# Table schema (v0.5.5+): token \t category \t canonical \t original
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# Legacy 3-col rows (token \t category \t value) still readable.
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cmd_tokenize_value() {
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local table="$DEFAULT_TABLE"
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local category=""
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local value=""
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while [ $# -gt 0 ]; do
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case "$1" in
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--category) shift; category="$1" ;;
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--table) shift; table="$1" ;;
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-h|--help) echo "usage: tokenize-value [--category CAT] VALUE" >&2; exit 2 ;;
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*) value="$1" ;;
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esac
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shift
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done
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[ -n "$value" ] || die "tokenize-value needs a VALUE"
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init_table "$table"
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# Auto-detect category from value shape if not explicitly forced.
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if [ -z "$category" ]; then
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category=$(detect_category "$value")
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fi
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# Canonicalize so different surface forms of the same PHI share one token.
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local canonical
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canonical=$(normalize_value "$value" "$category")
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[ -z "$canonical" ] && canonical="$value"
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# Look up (category, canonical). Column 3 in both new (4-col) and legacy
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# (3-col) rows is the lookup key, so this works for both.
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local tok
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tok=$(awk -F'\t' -v cat="$category" -v c="$canonical" 'NR>1 && $2==cat && $3==c { print $1; exit }' "$table")
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if [ -n "$tok" ]; then
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printf '%s\n' "$tok"
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return 0
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fi
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# Create new — write 4 columns.
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local nextnum
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nextnum=$(awk -F'\t' -v cat="$category" '
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NR>1 && $2==cat && match($1, /_[0-9]+\]\]$/) {
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n = substr($1, RSTART+1, RLENGTH-3) + 0
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if (n > max) max = n
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}
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END { print max+1 }
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' "$table")
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tok=$(printf '[[%s_%04d]]' "$category" "$nextnum")
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umask 077
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printf '%s\t%s\t%s\t%s\n' "$tok" "$category" "$canonical" "$value" >> "$table"
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chmod 600 "$table" 2>/dev/null || true
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printf '%s\n' "$tok"
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}
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# detokenize-value: reverse of tokenize-value (looks up by token, returns original).
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cmd_detokenize_value() {
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local table="$DEFAULT_TABLE"
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local token=""
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while [ $# -gt 0 ]; do
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case "$1" in
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--table) shift; table="$1" ;;
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-h|--help) echo "usage: detokenize-value TOKEN" >&2; exit 2 ;;
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*) token="$1" ;;
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esac
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shift
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done
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[ -n "$token" ] || die "detokenize-value needs a TOKEN"
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[ -f "$table" ] || die "no lookup table at $table"
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local val
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# Prefer column 4 (original surface form) for new rows; fall back to col 3
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# for legacy 3-col rows where col 3 IS the original value.
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val=$(awk -F'\t' -v t="$token" 'NR>1 && $1==t { print ($4 != "" ? $4 : $3); exit }' "$table")
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if [ -z "$val" ]; then
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printf 'no such token: %s\n' "$token" >&2
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return 2
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fi
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printf '%s\n' "$val"
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}
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init_table() {
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local table="$1"
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mkdir -p "$(dirname "$table")" 2>/dev/null
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chmod 700 "$(dirname "$table")" 2>/dev/null || true
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if [ ! -f "$table" ]; then
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umask 077
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printf 'token\tcategory\tcanonical\toriginal\n' > "$table"
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chmod 600 "$table"
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fi
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}
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# ─────────────────────────────────────────────────────────────────────────────
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# Main sanitize logic — single awk pass over HL7 messages.
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# ─────────────────────────────────────────────────────────────────────────────
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do_sanitize() {
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local input_file="$1"
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local rules="$2"
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local table="$3"
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local strict="$4"
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local update_table="$5"
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init_table "$table"
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# Write rules to a temp file because awk -v can't carry newlines on macOS
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local rules_tmp; rules_tmp=$(mktemp)
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printf '%s\n' "$rules" > "$rules_tmp"
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trap 'rm -f "$rules_tmp"' RETURN
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local awk_script
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awk_script=$(cat <<'AWK_END'
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BEGIN {
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ORS = "\r"
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# During BEGIN, read auxiliary files with newline separator
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RS = "\n"
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while ((getline line < RULES_FILE) > 0) {
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gsub(/^[[:space:]]+|[[:space:]]+$/, "", line)
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if (line == "" || substr(line,1,1) == "#") continue
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split(line, p, "|")
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if (p[1] == "" || p[2] == "" || p[3] == "") continue
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rule_cat[p[1] SUBSEP (p[2]+0)] = p[3]
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has_seg[p[1]] = 1
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}
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close(RULES_FILE)
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while ((getline tline < TABLE) > 0) {
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if (tline ~ /^token\t/) continue
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split(tline, c, "\t")
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if (c[1] == "" || c[3] == "") continue
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token_for[c[2] SUBSEP c[3]] = c[1]
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if (match(c[1], /_[0-9]+\]\]$/)) {
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num = substr(c[1], RSTART+1, RLENGTH-3) + 0
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if (num > counter[c[2]]) counter[c[2]] = num
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}
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}
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close(TABLE)
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# Switch to CR for the main input (HL7 segments)
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RS = "\r"
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}
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function tokenize(val, cat, key, t) {
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if (val == "" || val == "\"\"") return val
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key = cat SUBSEP val
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if (key in token_for) return token_for[key]
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counter[cat]++
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t = sprintf("[[%s_%04d]]", cat, counter[cat])
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token_for[key] = t
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if (UPDATE_TABLE == "1") {
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new_entries[++n_new] = t "\t" cat "\t" val
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}
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return t
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}
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{
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# Each record (a segment, separated by \r). Bytes outside segments — like
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# 0x1c message separators — get printed through unchanged if we just print.
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if (length($0) < 3) { print; next }
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seg = substr($0, 1, 3)
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# Strict mode: any Z segment we have no rules for → tokenize the whole segment body
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if (STRICT == "1" && substr(seg,1,1) == "Z" && !(seg in has_seg)) {
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body = substr($0, 5) # skip "Zxx|"
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if (body != "") {
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tok = tokenize(body, "Z" substr(seg,2,2))
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print seg "|" tok
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} else {
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print
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}
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next
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}
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if (!(seg in has_seg)) { print; next }
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is_msh = (seg == "MSH")
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nf = split($0, fields, "|")
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# For MSH, fields[1] is "MSH", fields[2] is the encoding chars (MSH.2).
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# MSH.N → fields[N] for N >= 2; MSH.1 is the separator char (skip).
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# For others, SEG.N → fields[N+1].
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for (k in rule_cat) {
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split(k, kp, SUBSEP)
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if (kp[1] != seg) continue
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fnum = kp[2] + 0
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cat = rule_cat[k]
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idx = is_msh ? fnum : (fnum + 1)
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if (idx < 1 || idx > nf) continue
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fields[idx] = tokenize(fields[idx], cat)
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}
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line = fields[1]
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for (j=2; j<=nf; j++) line = line "|" fields[j]
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print line
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}
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END {
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if (UPDATE_TABLE == "1" && n_new > 0) {
|
|
# Use explicit \n — ORS is \r for the main HL7 input loop, not for the table.
|
|
for (i=1; i<=n_new; i++) printf "%s\n", new_entries[i] >> TABLE
|
|
close(TABLE)
|
|
}
|
|
printf "hl7-sanitize: %d new token(s) created; %d total in %s\n", \
|
|
n_new, length(token_for), TABLE > "/dev/stderr"
|
|
}
|
|
AWK_END
|
|
)
|
|
|
|
if [ -n "$input_file" ]; then
|
|
awk -v RULES_FILE="$rules_tmp" -v TABLE="$table" -v STRICT="$strict" \
|
|
-v UPDATE_TABLE="$update_table" \
|
|
"$awk_script" "$input_file"
|
|
else
|
|
awk -v RULES_FILE="$rules_tmp" -v TABLE="$table" -v STRICT="$strict" \
|
|
-v UPDATE_TABLE="$update_table" \
|
|
"$awk_script" /dev/stdin
|
|
fi
|
|
}
|
|
|
|
# ─────────────────────────────────────────────────────────────────────────────
|
|
# Dispatch
|
|
# ─────────────────────────────────────────────────────────────────────────────
|
|
SUB="${1:-}"
|
|
# v0.8.26: route the whole dispatch's stdout through the tty-gated sanitizer in
|
|
# a brace group, then propagate ${PIPESTATUS[0]} so each subcommand's exit code
|
|
# survives the pipe. On a pipe/redirect the gate is a no-op (raw passthrough).
|
|
# clear-table's confirmation read uses /dev/tty directly, so the pipeline
|
|
# subshell does not interfere with it.
|
|
{
|
|
case "$SUB" in
|
|
show-rules) shift; cmd_show_rules ;;
|
|
show-table) shift; cmd_show_table "$@" ;;
|
|
clear-table) shift; cmd_clear_table "$@" ;;
|
|
count) shift; cmd_count "$@" ;;
|
|
tokenize-value) shift; cmd_tokenize_value "$@" ;;
|
|
detokenize-value) shift; cmd_detokenize_value "$@" ;;
|
|
normalize-value)
|
|
# v0.7.3: normalize-value VALUE [CATEGORY] — emit canonical form without
|
|
# tokenizing or touching the table. Used by larry.sh's v0.7.3 auto-PHI
|
|
# detection to build per-session memory keys so "John Smith" and
|
|
# "JOHN SMITH" share one accept/decline decision.
|
|
# (Originally added in af2ffe8 — reverted with v0.7.1; re-added per
|
|
# v0.7.3 auto-PHI spec.)
|
|
shift
|
|
nv_val="${1:-}"; nv_cat="${2:-}"
|
|
[ -n "$nv_val" ] || die "normalize-value needs a VALUE"
|
|
[ -n "$nv_cat" ] || nv_cat=$(detect_category "$nv_val")
|
|
normalize_value "$nv_val" "$nv_cat"
|
|
printf '\n'
|
|
;;
|
|
lookup-original)
|
|
# v0.7.3: lookup-original VALUE CATEGORY — return token if value is
|
|
# already present in the lookup table (Tier-4 "already-known" check).
|
|
# Empty stdout + exit 0 if not found; non-empty token + exit 0 if found.
|
|
shift
|
|
lo_val="${1:-}"; lo_cat="${2:-}"
|
|
[ -n "$lo_val" ] || die "lookup-original needs a VALUE"
|
|
[ -n "$lo_cat" ] || lo_cat=$(detect_category "$lo_val")
|
|
lo_canonical=$(normalize_value "$lo_val" "$lo_cat")
|
|
[ -z "$lo_canonical" ] && lo_canonical="$lo_val"
|
|
[ -f "$DEFAULT_TABLE" ] || { printf ''; exit 0; }
|
|
awk -F'\t' -v cat="$lo_cat" -v c="$lo_canonical" -v orig="$lo_val" '
|
|
NR>1 && $2==cat && ($3==c || $4==orig) { print $1; exit }
|
|
' "$DEFAULT_TABLE"
|
|
;;
|
|
-h|--help) sed -n '2,30p' "$NC_SELF"; exit 0 ;;
|
|
*)
|
|
# Default = sanitize mode
|
|
input_file=""
|
|
rules="$PHI_RULES_DEFAULT"
|
|
table="$DEFAULT_TABLE"
|
|
strict=0
|
|
update_table=1
|
|
while [ $# -gt 0 ]; do
|
|
case "$1" in
|
|
--strict) strict=1 ;;
|
|
--no-update-table) update_table=0 ;;
|
|
--table) shift; table="$1" ;;
|
|
--rules-file) shift; [ -f "$1" ] || die "no such rules file: $1"; rules=$(cat "$1") ;;
|
|
-h|--help) sed -n '2,30p' "$NC_SELF"; exit 0 ;;
|
|
-*) die "unknown flag: $1" ;;
|
|
*) input_file="$1" ;;
|
|
esac
|
|
shift
|
|
done
|
|
do_sanitize "$input_file" "$rules" "$table" "$strict" "$update_table"
|
|
;;
|
|
esac
|
|
} | _sanitize_ctl_tty
|
|
exit "${PIPESTATUS[0]}"
|