refactor(compliance): extract business logic to compliance_service, use domain exceptions instead of HTTPException
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327
backend/app/services/compliance_service.py
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327
backend/app/services/compliance_service.py
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"""Compliance data service.
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Extracts query and aggregation logic from the compliance router so
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that the router remains a thin HTTP adapter.
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This module is framework-agnostic: no FastAPI imports.
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"""
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from __future__ import annotations
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import csv
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import io
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from typing import Any
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from sqlalchemy.orm import Session
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from app.domain.errors import EntityNotFoundError
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from app.models.compliance import (
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ComplianceFramework,
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ComplianceControl,
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ComplianceControlMapping,
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)
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from app.models.technique import Technique
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from app.models.test_template import TestTemplate
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from app.models.threat_actor import ThreatActorTechnique
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from app.services.scoring_service import calculate_technique_score
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# ── Helpers ───────────────────────────────────────────────────────────
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def _classify_control(technique_scores: list[float]) -> str:
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"""Classify a control status based on its technique scores."""
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if not technique_scores:
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return "not_evaluated"
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all_above_70 = all(s >= 70 for s in technique_scores)
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any_above_30 = any(s >= 30 for s in technique_scores)
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all_below_30 = all(s < 30 for s in technique_scores)
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all_zero = all(s == 0 for s in technique_scores)
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if all_zero:
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return "not_evaluated"
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if all_above_70:
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return "covered"
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if all_below_30:
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return "not_covered"
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if any_above_30:
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return "partially_covered"
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return "not_covered"
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def _get_control_status(control: ComplianceControl, db: Session) -> dict[str, Any]:
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"""Compute the status and score for a single control."""
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mappings = (
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db.query(ComplianceControlMapping)
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.filter(ComplianceControlMapping.compliance_control_id == control.id)
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.all()
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)
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if not mappings:
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return {
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"control_id": control.control_id,
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"title": control.title,
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"category": control.category,
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"status": "not_evaluated",
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"score": 0,
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"techniques_count": 0,
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"techniques_covered": 0,
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"techniques": [],
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}
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technique_ids = [m.technique_id for m in mappings]
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techniques = (
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db.query(Technique)
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.filter(Technique.id.in_(technique_ids))
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.all()
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)
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tech_details = []
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scores = []
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covered_count = 0
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for tech in techniques:
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result = calculate_technique_score(tech, db)
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score = result["total_score"]
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scores.append(score)
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if score >= 50:
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covered_count += 1
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tech_details.append({
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"mitre_id": tech.mitre_id,
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"name": tech.name,
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"score": score,
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"status": tech.status_global.value if tech.status_global else "not_evaluated",
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})
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# Sort techniques by score ascending (worst first for priority)
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tech_details.sort(key=lambda t: t["score"])
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avg_score = round(sum(scores) / len(scores), 1) if scores else 0
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status = _classify_control(scores)
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return {
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"control_id": control.control_id,
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"title": control.title,
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"category": control.category,
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"status": status,
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"score": avg_score,
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"techniques_count": len(techniques),
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"techniques_covered": covered_count,
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"techniques": tech_details,
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}
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# ── Public service functions ───────────────────────────────────────────
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def list_frameworks(db: Session) -> list[dict[str, Any]]:
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"""List all available compliance frameworks with control counts."""
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frameworks = (
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db.query(ComplianceFramework)
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.filter(ComplianceFramework.is_active == True)
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.all()
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)
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result = []
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for fw in frameworks:
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control_count = (
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db.query(ComplianceControl)
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.filter(ComplianceControl.framework_id == fw.id)
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.count()
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)
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result.append({
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"id": str(fw.id),
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"name": fw.name,
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"version": fw.version,
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"description": fw.description,
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"url": fw.url,
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"is_active": fw.is_active,
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"controls_count": control_count,
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})
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return result
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def get_framework(db: Session, framework_id: str) -> ComplianceFramework | None:
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"""Get a framework by ID, or None if not found."""
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return (
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db.query(ComplianceFramework)
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.filter(ComplianceFramework.id == framework_id)
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.first()
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)
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def get_framework_status(db: Session, framework_id: str) -> dict[str, Any]:
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"""Get compliance status for each control in a framework.
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Raises EntityNotFoundError if the framework does not exist.
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"""
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framework = get_framework(db, framework_id)
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if not framework:
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raise EntityNotFoundError("Framework", framework_id)
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controls = (
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db.query(ComplianceControl)
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.filter(ComplianceControl.framework_id == framework.id)
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.order_by(ComplianceControl.control_id)
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.all()
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)
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control_statuses = []
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summary = {
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"total_controls": len(controls),
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"covered": 0,
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"partially_covered": 0,
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"not_covered": 0,
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"not_evaluated": 0,
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}
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for control in controls:
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status_data = _get_control_status(control, db)
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control_statuses.append(status_data)
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status = status_data["status"]
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if status in summary:
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summary[status] += 1
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# Compliance percentage: (covered + partially_covered*0.5) / total * 100
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total = summary["total_controls"]
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if total > 0:
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compliance_pct = round(
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(summary["covered"] + summary["partially_covered"] * 0.5) / total * 100,
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1,
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)
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else:
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compliance_pct = 0
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summary["compliance_percentage"] = compliance_pct
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return {
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"framework": {"id": str(framework.id), "name": framework.name},
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"summary": summary,
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"controls": control_statuses,
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}
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def build_framework_report_csv(
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db: Session,
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framework_id: str,
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) -> tuple[bytes, str]:
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"""Build the compliance report CSV content and filename.
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Returns (csv_bytes, filename).
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Raises EntityNotFoundError if the framework does not exist.
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"""
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framework = get_framework(db, framework_id)
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if not framework:
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raise EntityNotFoundError("Framework", framework_id)
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controls = (
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db.query(ComplianceControl)
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.filter(ComplianceControl.framework_id == framework.id)
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.order_by(ComplianceControl.control_id)
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.all()
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)
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output = io.StringIO()
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writer = csv.writer(output)
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writer.writerow([
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"control_id",
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"title",
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"category",
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"status",
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"score",
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"techniques_total",
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"techniques_covered",
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"technique_ids",
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])
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for control in controls:
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status_data = _get_control_status(control, db)
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technique_ids = ",".join(t["mitre_id"] for t in status_data["techniques"])
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writer.writerow([
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status_data["control_id"],
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status_data["title"],
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status_data["category"] or "",
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status_data["status"],
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status_data["score"],
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status_data["techniques_count"],
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status_data["techniques_covered"],
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technique_ids,
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])
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output.seek(0)
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filename = f"compliance_{framework.name.replace(' ', '_')}.csv"
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return output.getvalue().encode("utf-8"), filename
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def get_framework_gaps(db: Session, framework_id: str) -> dict[str, Any]:
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"""Get controls with techniques that are not adequately covered.
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Raises EntityNotFoundError if the framework does not exist.
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"""
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framework = get_framework(db, framework_id)
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if not framework:
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raise EntityNotFoundError("Framework", framework_id)
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controls = (
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db.query(ComplianceControl)
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.filter(ComplianceControl.framework_id == framework.id)
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.order_by(ComplianceControl.control_id)
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.all()
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)
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gaps = []
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for control in controls:
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status_data = _get_control_status(control, db)
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if status_data["status"] in ("not_covered", "partially_covered"):
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# Find uncovered techniques
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uncovered_techniques = []
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for tech_info in status_data["techniques"]:
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if tech_info["score"] < 70:
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# Count available templates
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template_count = (
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db.query(TestTemplate)
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.filter(TestTemplate.mitre_technique_id == tech_info["mitre_id"])
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.count()
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)
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# Count threat actors using this technique
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technique = (
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db.query(Technique)
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.filter(Technique.mitre_id == tech_info["mitre_id"])
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.first()
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)
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actor_count = 0
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if technique:
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actor_count = (
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db.query(ThreatActorTechnique)
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.filter(ThreatActorTechnique.technique_id == technique.id)
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.count()
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)
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uncovered_techniques.append({
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**tech_info,
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"templates_available": template_count,
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"threat_actors_using": actor_count,
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})
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if uncovered_techniques:
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gaps.append({
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"control_id": status_data["control_id"],
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"title": status_data["title"],
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"category": status_data["category"],
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"status": status_data["status"],
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"score": status_data["score"],
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"uncovered_techniques": uncovered_techniques,
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})
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return {
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"framework": {"id": str(framework.id), "name": framework.name},
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"total_gaps": len(gaps),
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"gaps": gaps,
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}
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