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from hashlib import sha256
from unicodedata import normalize
from uuid import uuid4
from datetime import datetime, timezone
from rapidfuzz import fuzz, process
def run_vendor_validation(
*,
document,
extracted_fields,
vendors,
platform_configs,
route_contexts=None,
actor_id=None,
):
"""
Runs Cat 2 vendor validation using RapidFuzz instead of the platform name-match algorithm.
Expected document fields:
document.id
document.tenant_id
Expected extracted_fields fields:
sender_name
sender_name_canonical
sender_tax_id_canonical
bank_iban_canonical
Expected vendor fields:
id
tenant_id
legal_name
vendor_name
legal_name_canonical
billing_country
billing_address
vendor_status
deleted_at
Returns a dict containing:
resolved_vendor_id
resolved_sender_name
resolved_sender_addr
risk_flags
advisory_flags
skipped_steps
audit_row
match_result
"""
route_contexts = set(route_contexts or [])
require_high_tier_contexts = set(
platform_configs.get(
"validation.vendor_match_require_high_tier_contexts",
["contract_match", "bank_validation", "approval_revalidation"],
)
)
algorithm_version = platform_configs.get(
"validation.name_match_algorithm_version",
"rapidfuzz.local.v1",
)
high_threshold = Decimal(str(platform_configs.get("validation.rapidfuzz_high_threshold", "0.90")))
medium_threshold = Decimal(str(platform_configs.get("validation.rapidfuzz_medium_threshold", "0.75")))
suggestion_threshold = Decimal(str(platform_configs.get("validation.rapidfuzz_suggestion_threshold", "0.60")))
def canonicalize(value):
if not value:
return ""
return normalize("NFKC", str(value)).lower().strip()
def hash_prefix(value, length=8):
if not value:
return None
return sha256(str(value).encode("utf-8")).hexdigest()[:length]
def get_vendor_names(vendor):
names = []
for name in (
getattr(vendor, "legal_name", None),
getattr(vendor, "vendor_name", None),
):
canonical = canonicalize(name)
if canonical and canonical not in names:
names.append(canonical)
return names
def build_candidate_pool():
pool = []
for vendor in vendors:
if getattr(vendor, "tenant_id", None) != document.tenant_id:
continue
if getattr(vendor, "vendor_status", None) == "deleted":
continue
if getattr(vendor, "deleted_at", None) is not None:
continue
names = get_vendor_names(vendor)
if not names:
continue
pool.append(
{
"record_id": vendor.id,
"vendor": vendor,
"names": names,
"auxiliary": {
"country": getattr(vendor, "billing_country", None),
"tax_id_hash": hash_prefix(
getattr(extracted_fields, "sender_tax_id_canonical", None)
),
"iban_hash": hash_prefix(
getattr(extracted_fields, "bank_iban_canonical", None)
),
},
}
)
return pool
def rapidfuzz_name_match(query_name, candidate_pool):
choices = []
for candidate in candidate_pool:
for name in candidate["names"]:
choices.append(
{
"name": name,
"record_id": candidate["record_id"],
"vendor": candidate["vendor"],
}
)
if not query_name or not choices:
return {
"decision": "unmatched",
"matched_record_id": None,
"matched_vendor": None,
"runner_up_record_id": None,
"runner_up_vendor": None,
"score": Decimal("0"),
"score_tier": "low",
"algorithm_version": algorithm_version,
"trace_id": str(uuid4()),
}
raw_matches = process.extract(
query_name,
[choice["name"] for choice in choices],
scorer=fuzz.WRatio,
limit=5,
)
ranked = []
seen_record_ids = set()
for matched_name, score, choice_index in raw_matches:
choice = choices[choice_index]
record_id = choice["record_id"]
if record_id in seen_record_ids:
continue
seen_record_ids.add(record_id)
ranked.append(
{
"record_id": record_id,
"vendor": choice["vendor"],
"matched_name": matched_name,
"score": Decimal(str(score / 100)).quantize(Decimal("0.0001")),
}
)
if not ranked:
best = None
runner_up = None
score = Decimal("0")
else:
best = ranked[0]
runner_up = ranked[1] if len(ranked) > 1 else None
score = best["score"]
if score >= high_threshold:
decision = "matched"
score_tier = "high"
matched_record_id = best["record_id"]
matched_vendor = best["vendor"]
elif score >= medium_threshold:
decision = "matched"
score_tier = "medium"
matched_record_id = best["record_id"]
matched_vendor = best["vendor"]
elif score >= suggestion_threshold:
decision = "suggestion"
score_tier = "low"
matched_record_id = None
matched_vendor = None
else:
decision = "unmatched"
score_tier = "low"
matched_record_id = None
matched_vendor = None
return {
"decision": decision,
"matched_record_id": matched_record_id,
"matched_vendor": matched_vendor,
"runner_up_record_id": (
best["record_id"] if decision == "suggestion" and best
else (runner_up["record_id"] if runner_up else None)
),
"runner_up_vendor": (
best["vendor"] if decision == "suggestion" and best
else (runner_up["vendor"] if runner_up else None)
),
"score": score,
"score_tier": score_tier,
"algorithm_version": algorithm_version,
"trace_id": str(uuid4()),
}
risk_flags = []
advisory_flags = []
skipped_steps = []
resolved_vendor_id = None
resolved_sender_name = None
resolved_sender_addr = None
query_name = canonicalize(
getattr(extracted_fields, "sender_name_canonical", None)
or getattr(extracted_fields, "sender_name", None)
)
candidate_pool = build_candidate_pool()
match_result = rapidfuzz_name_match(
query_name=query_name,
candidate_pool=candidate_pool,
)
decision = match_result["decision"]
score_tier = match_result["score_tier"]
control_context_requires_high = bool(route_contexts & require_high_tier_contexts)
if decision == "matched" and score_tier == "high":
resolved_vendor_id = match_result["matched_record_id"]
elif decision == "matched" and score_tier == "medium":
if control_context_requires_high:
match_result["decision"] = "suggestion"
advisory_flags.append(
{
"code": "vendor_suggestion",
"severity": "advisory",
"record_id": match_result["matched_record_id"],
"reason": "medium_tier_match_downgraded_for_control_context",
}
)
skipped_steps.extend(
[
{"step": "vendor_tax_validation", "skip_reason": "vendor_unresolved"},
{"step": "vendor_bank_validation", "skip_reason": "vendor_unresolved"},
{"step": "vendor_status_validation", "skip_reason": "vendor_unresolved"},
]
)
else:
resolved_vendor_id = match_result["matched_record_id"]
risk_flags.append(
{
"code": "low_confidence_vendor_resolution",
"severity": "medium",
"record_id": resolved_vendor_id,
"score_tier": score_tier,
}
)
elif decision == "suggestion":
advisory_flags.append(
{
"code": "vendor_suggestion",
"severity": "advisory",
"record_id": match_result["runner_up_record_id"],
"reason": "possible_vendor_match",
}
)
skipped_steps.extend(
[
{"step": "sender_field_override", "skip_reason": "vendor_unresolved"},
{"step": "vendor_tax_validation", "skip_reason": "vendor_unresolved"},
{"step": "vendor_bank_validation", "skip_reason": "vendor_unresolved"},
{"step": "vendor_status_validation", "skip_reason": "vendor_unresolved"},
]
)
else:
risk_flags.append(
{
"code": "unknown_vendor",
"severity": "high",
"reason": "no_vendor_match_found",
}
)
skipped_steps.extend(
[
{"step": "sender_field_override", "skip_reason": "vendor_unresolved"},
{"step": "vendor_tax_validation", "skip_reason": "vendor_unresolved"},
{"step": "vendor_bank_validation", "skip_reason": "vendor_unresolved"},
{"step": "vendor_status_validation", "skip_reason": "vendor_unresolved"},
]
)
blocked_vendor = None
if match_result["decision"] in ("matched", "suggestion"):
if match_result.get("matched_vendor") and match_result["matched_vendor"].vendor_status == "blocked":
blocked_vendor = match_result["matched_vendor"]
if match_result.get("runner_up_vendor") and match_result["runner_up_vendor"].vendor_status == "blocked":
blocked_vendor = match_result["runner_up_vendor"]
if blocked_vendor:
risk_flags.append(
{
"code": "vendor_blocked",
"severity": "high",
"record_id": blocked_vendor.id,
"reason": "matched_or_suggested_vendor_is_blocked",
}
)
if resolved_vendor_id:
resolved_vendor = match_result["matched_vendor"]
resolved_sender_name = (
getattr(resolved_vendor, "legal_name", None)
or getattr(resolved_vendor, "vendor_name", None)
)
billing_address = getattr(resolved_vendor, "billing_address", None)
if billing_address is not None:
resolved_sender_addr = billing_address
audit_row = {
"document_id": document.id,
"query_name_hash_prefix_8": hash_prefix(query_name, length=8),
"algorithm_version": algorithm_version,
"decision": match_result["decision"],
"matched_record_id": match_result["matched_record_id"],
"runner_up_record_id": match_result["runner_up_record_id"],
"score_tier": match_result["score_tier"],
"score": str(match_result["score"]),
"trace_id": match_result["trace_id"],
"called_at": datetime.now(timezone.utc),
"actor_id": actor_id,
}
return {
"resolved_vendor_id": resolved_vendor_id,
"resolved_sender_name": resolved_sender_name,
"resolved_sender_addr": resolved_sender_addr,
"risk_flags": risk_flags,
"advisory_flags": advisory_flags,
"skipped_steps": skipped_steps,
"audit_row": audit_row,
"match_result": {
"decision": match_result["decision"],
"matched_record_id": resolved_vendor_id,
"runner_up_record_id": match_result["runner_up_record_id"],
"score": match_result["score"],
"score_tier": match_result["score_tier"],
"algorithm_version": match_result["algorithm_version"],
"trace_id": match_result["trace_id"],
},
} |