diff --git a/agent.py b/agent.py new file mode 100644 index 0000000..81fdf4f --- /dev/null +++ b/agent.py @@ -0,0 +1,659 @@ +"""QuoteJudge full-stack A2A agent. + +Deterministic quote comparison, per-user persistence in managed Postgres, +browser-safe upload parsing, and production execution receipt storage. +""" +from __future__ import annotations + +import base64 +import csv +import hashlib +import io +import json +import os +import re +import uuid +from contextlib import contextmanager +from datetime import datetime, timezone +from typing import Annotated, Any + +from pydantic import BaseModel, Field, field_validator + +import a2a_pack as a2a +from a2a_pack import ( + A2AAgent, + AgentDatabase, + AgentDatabaseEnv, + AgentDatabaseMigrations, + AgentPlatformResources, + PlatformUserAuth, + Pricing, + Resources, + RunContext, + State, + WorkspaceAccess, + WorkspaceMode, +) +from a2a_pack.workspace import FileUpload, UploadedFile + +try: # psycopg is installed in deployment and sandbox via requirements.txt. + import psycopg + from psycopg.rows import dict_row +except Exception: # pragma: no cover - import guard for card-only tooling + psycopg = None + dict_row = None + + +MAX_QUOTES = 20 +MAX_VENDOR_LENGTH = 120 +MAX_UPLOADS = 5 +MAX_UPLOAD_BYTES = 128_000 +ALLOWED_UPLOAD_MEDIA_TYPES = {"text/csv", "text/plain", "application/json"} +_DATABASE_NAME = "quote-judge-studio-v1-data" +_LOCAL_COMPARISONS: dict[tuple[str, str], dict[str, Any]] = {} +_LOCAL_RECEIPTS: list[dict[str, Any]] = [] + + +class QuoteJudgeStudioV1Config(BaseModel): + """No caller-configured settings are required.""" + + +class QuoteInput(BaseModel): + vendor: str = Field(..., min_length=1, max_length=MAX_VENDOR_LENGTH) + quantity: int = Field(..., gt=0, le=10_000_000) + unit_price: float = Field(..., ge=0, le=1_000_000_000) + delivery_days: int = Field(..., ge=0, le=3650) + warranty_months: int = Field(..., ge=0, le=600) + + @field_validator("vendor") + @classmethod + def clean_vendor(cls, value: str) -> str: + cleaned = " ".join(value.strip().split()) + if not cleaned: + raise ValueError("vendor is required") + return cleaned + + +class QuoteWeights(BaseModel): + price: float = Field(..., ge=0, le=100) + delivery: float = Field(..., ge=0, le=100) + warranty: float = Field(..., ge=0, le=100) + + @field_validator("warranty") + @classmethod + def weights_must_be_positive(cls, value: float, info: Any) -> float: + values = info.data + total = float(values.get("price", 0)) + float(values.get("delivery", 0)) + float(value) + if total <= 0: + raise ValueError("at least one weight must be positive") + return value + + +class BrowserQuoteDocument(BaseModel): + filename: str = Field(..., min_length=1, max_length=160) + media_type: str = Field(..., min_length=1, max_length=100) + data_base64: str = Field(..., min_length=1) + + @field_validator("filename") + @classmethod + def safe_filename(cls, value: str) -> str: + cleaned = value.strip().replace("\\", "/").split("/")[-1] + if not cleaned or cleaned in {".", ".."}: + raise ValueError("filename is required") + return cleaned[:160] + + +class QuoteJudgeState(BaseModel): + """Durable state is stored in managed Postgres; this schema advertises that fact.""" + + persistence: str = "managed_postgres" + + +class QuoteJudgeStudioV1(A2AAgent[QuoteJudgeStudioV1Config, PlatformUserAuth]): + name = "quote-judge-studio-v1" + description = ( + "QuoteJudge compares vendor quotes with weighted price, delivery, and " + "warranty scoring, persists per-user comparisons, and serves a one-page product UI." + ) + version = "0.1.1" + + config_model = QuoteJudgeStudioV1Config + auth_model = PlatformUserAuth + state = State.DURABLE + state_model = QuoteJudgeState + resources = Resources(cpu="500m", memory="512Mi", max_runtime_seconds=300) + platform_resources = AgentPlatformResources( + databases=( + AgentDatabase( + name=_DATABASE_NAME, + scope="user", + access_mode="read_write", + env=AgentDatabaseEnv(url="DATABASE_URL"), + migrations=AgentDatabaseMigrations(path="db/migrations"), + ), + ) + ) + pricing = Pricing( + price_per_call_usd=0.0, + caller_pays_llm=False, + notes="Deterministic local quote scoring; no LLM credential is required.", + ) + workspace_access = WorkspaceAccess.dynamic( + max_files=MAX_UPLOADS, + allowed_modes=(WorkspaceMode.READ_ONLY,), + require_reason=False, + max_total_size_bytes=MAX_UPLOADS * MAX_UPLOAD_BYTES, + ) + tools_used = ("postgres", "mcp") + + @a2a.tool( + description=( + "Compare at least two vendor quotes using typed price, delivery, and warranty " + "weights; persist the recommendation and a production receipt." + ), + timeout_seconds=30, + idempotent=True, + cost_class="cheap", + ) + async def compare_quotes( + self, + ctx: RunContext[PlatformUserAuth], + comparison_id: str, + quotes: list[QuoteInput], + weights: QuoteWeights, + ) -> dict[str, Any]: + tenant = _tenant_key(ctx) + cleaned_id = _clean_comparison_id(comparison_id) + started = _now_iso() + input_payload = { + "comparison_id": cleaned_id, + "quotes": [quote.model_dump() for quote in quotes], + "weights": weights.model_dump(), + } + + if len(quotes) < 2: + result = { + "ok": False, + "code": "at_least_two_quotes_required", + "message": "Add at least two vendor quotes before comparing.", + "comparison_id": cleaned_id, + } + await _persist_receipt( + tenant_key=tenant, + comparison_id=cleaned_id, + skill_name="compare_quotes", + input_payload=input_payload, + result_payload=result, + status="validation_error", + started_at=started, + ) + return result + if len(quotes) > MAX_QUOTES: + result = { + "ok": False, + "code": "too_many_quotes", + "message": f"Compare at most {MAX_QUOTES} quotes at a time.", + "comparison_id": cleaned_id, + } + await _persist_receipt( + tenant_key=tenant, + comparison_id=cleaned_id, + skill_name="compare_quotes", + input_payload=input_payload, + result_payload=result, + status="validation_error", + started_at=started, + ) + return result + + result = _score_quotes(cleaned_id, quotes, weights) + await _save_comparison(tenant, result) + await _persist_receipt( + tenant_key=tenant, + comparison_id=cleaned_id, + skill_name="compare_quotes", + input_payload=input_payload, + result_payload=result, + status="ok", + started_at=started, + ) + return result + + @a2a.tool( + description="Reopen a saved QuoteJudge comparison for the authenticated user.", + timeout_seconds=15, + idempotent=True, + cost_class="cheap", + ) + async def get_comparison( + self, + ctx: RunContext[PlatformUserAuth], + comparison_id: str, + ) -> dict[str, Any]: + tenant = _tenant_key(ctx) + cleaned_id = _clean_comparison_id(comparison_id) + started = _now_iso() + record = await _load_comparison(tenant, cleaned_id) + if record is None: + result = { + "ok": False, + "code": "comparison_not_found", + "message": "No saved comparison exists for this id and user.", + "comparison_id": cleaned_id, + } + else: + result = dict(record) + result["ok"] = True + await _persist_receipt( + tenant_key=tenant, + comparison_id=cleaned_id, + skill_name="get_comparison", + input_payload={"comparison_id": cleaned_id}, + result_payload=result, + status="ok" if result.get("ok") else "not_found", + started_at=started, + ) + return result + + @a2a.tool( + description=( + "Browser upload bridge: parse bounded base64 JSON/CSV/text quote files, " + "compare extracted quotes, and persist the result." + ), + timeout_seconds=30, + idempotent=True, + cost_class="cheap", + ) + async def compare_uploaded_quotes_browser( + self, + ctx: RunContext[PlatformUserAuth], + comparison_id: str, + documents: list[BrowserQuoteDocument], + weights: QuoteWeights, + ) -> dict[str, Any]: + parsed = _parse_browser_documents(documents) + if not parsed["ok"]: + return parsed + return await self.compare_quotes( + ctx, + comparison_id=comparison_id, + quotes=[QuoteInput.model_validate(item) for item in parsed["quotes"]], + weights=weights, + ) + + @a2a.tool( + description=( + "External-client upload path: parse an uploaded CSV, JSON, or plain-text quote " + "file and compare extracted quotes." + ), + timeout_seconds=30, + idempotent=True, + cost_class="cheap", + ) + async def compare_uploaded_quote_file( + self, + ctx: RunContext[PlatformUserAuth], + comparison_id: str, + document: Annotated[ + UploadedFile, + FileUpload( + accept=("text/csv", "text/plain", "application/json"), + max_bytes=MAX_UPLOAD_BYTES, + description="CSV, JSON, or text file containing vendor quote rows.", + ), + ], + weights: QuoteWeights, + ) -> dict[str, Any]: + if document.size_bytes > MAX_UPLOAD_BYTES: + return { + "ok": False, + "code": "upload_too_large", + "message": f"Upload must be {MAX_UPLOAD_BYTES} bytes or smaller.", + "comparison_id": _clean_comparison_id(comparison_id), + } + if document.media_type not in ALLOWED_UPLOAD_MEDIA_TYPES: + return { + "ok": False, + "code": "unsupported_media_type", + "message": "Upload must be CSV, JSON, or plain text.", + "comparison_id": _clean_comparison_id(comparison_id), + } + try: + reader = getattr(ctx.workspace, "read_bytes") + raw = reader(document.path) + except Exception: + return { + "ok": False, + "code": "upload_read_failed", + "message": "Could not read the uploaded file from the granted workspace.", + "comparison_id": _clean_comparison_id(comparison_id), + } + parsed = _parse_document_bytes(document.filename, document.media_type, raw) + if not parsed["ok"]: + return parsed + return await self.compare_quotes( + ctx, + comparison_id=comparison_id, + quotes=[QuoteInput.model_validate(item) for item in parsed["quotes"]], + weights=weights, + ) + + +def _tenant_key(ctx: RunContext[PlatformUserAuth]) -> str: + auth = ctx.auth + ident = auth.user_id if auth.user_id is not None else (auth.sub or auth.email) + return f"user:{ident}" + + +def _clean_comparison_id(value: str) -> str: + cleaned = str(value or "").strip() + if not re.fullmatch(r"[A-Za-z0-9][A-Za-z0-9_.:-]{0,79}", cleaned): + raise ValueError("comparison_id must be 1-80 safe characters") + return cleaned + + +def _score_sort_key(row: dict[str, Any]) -> tuple[float, float, int, int, str]: + return ( + -float(row["scores"]["weighted_total"]), + float(row["subtotal"]), + int(row["delivery_days"]), + -int(row["warranty_months"]), + str(row["vendor"]).lower(), + ) + + +def _subtotal_key(row: dict[str, Any]) -> float: + return float(row["subtotal"]) + + +def _score_quotes(comparison_id: str, quotes: list[QuoteInput], weights: QuoteWeights) -> dict[str, Any]: + quote_rows = [quote.model_dump() for quote in quotes] + for row in quote_rows: + row["subtotal"] = round(row["quantity"] * row["unit_price"], 2) + + totals = [row["subtotal"] for row in quote_rows] + deliveries = [row["delivery_days"] for row in quote_rows] + warranties = [row["warranty_months"] for row in quote_rows] + total_weight = weights.price + weights.delivery + weights.warranty + normalized_weights = { + "price": weights.price / total_weight, + "delivery": weights.delivery / total_weight, + "warranty": weights.warranty / total_weight, + } + + scored: list[dict[str, Any]] = [] + for row in quote_rows: + price_score = _lower_is_better(row["subtotal"], totals) + delivery_score = _lower_is_better(row["delivery_days"], deliveries) + warranty_score = _higher_is_better(row["warranty_months"], warranties) + weighted_score = ( + price_score * normalized_weights["price"] + + delivery_score * normalized_weights["delivery"] + + warranty_score * normalized_weights["warranty"] + ) + scored.append( + { + **row, + "scores": { + "price": round(price_score, 4), + "delivery": round(delivery_score, 4), + "warranty": round(warranty_score, 4), + "weighted_total": round(weighted_score, 4), + }, + } + ) + + scored.sort(key=_score_sort_key) + winner = scored[0] + baseline = min(scored, key=_subtotal_key) + rationale_bits = [ + f"{winner['vendor']} has the highest weighted score ({winner['scores']['weighted_total']:.2f}).", + f"Its normalized total is {winner['subtotal']:.2f} for {winner['quantity']} units.", + ] + if winner["delivery_days"] == min(deliveries): + rationale_bits.append("It also has the fastest delivery among the submitted quotes.") + if winner["warranty_months"] == max(warranties): + rationale_bits.append("It offers the strongest warranty among the submitted quotes.") + if winner["vendor"] == baseline["vendor"]: + rationale_bits.append("It is the lowest-price option under the selected quantity.") + + return { + "ok": True, + "comparison_id": comparison_id, + "recommendation": { + "vendor": winner["vendor"], + "score": winner["scores"]["weighted_total"], + "normalized_total": winner["subtotal"], + "rationale": " ".join(rationale_bits), + }, + "weights": { + "price": weights.price, + "delivery": weights.delivery, + "warranty": weights.warranty, + "normalized": {key: round(value, 4) for key, value in normalized_weights.items()}, + }, + "quotes": scored, + "created_at": _now_iso(), + } + + +def _lower_is_better(value: float, values: list[float]) -> float: + min_value = min(values) + max_value = max(values) + if max_value == min_value: + return 1.0 + return (max_value - value) / (max_value - min_value) + + +def _higher_is_better(value: float, values: list[float]) -> float: + min_value = min(values) + max_value = max(values) + if max_value == min_value: + return 1.0 + return (value - min_value) / (max_value - min_value) + + +def _parse_browser_documents(documents: list[BrowserQuoteDocument]) -> dict[str, Any]: + if not documents: + return {"ok": False, "code": "no_uploads", "message": "Upload at least one quote file."} + if len(documents) > MAX_UPLOADS: + return {"ok": False, "code": "too_many_uploads", "message": f"Upload at most {MAX_UPLOADS} files."} + quotes: list[dict[str, Any]] = [] + for document in documents: + if document.media_type not in ALLOWED_UPLOAD_MEDIA_TYPES: + return {"ok": False, "code": "unsupported_media_type", "message": "Upload must be CSV, JSON, or plain text."} + try: + raw = base64.b64decode(document.data_base64, validate=True) + except Exception: + return {"ok": False, "code": "invalid_base64", "message": "Uploaded file data is not valid base64."} + if len(raw) > MAX_UPLOAD_BYTES: + return {"ok": False, "code": "upload_too_large", "message": f"Each upload must be {MAX_UPLOAD_BYTES} bytes or smaller."} + parsed = _parse_document_bytes(document.filename, document.media_type, raw) + if not parsed["ok"]: + return parsed + quotes.extend(parsed["quotes"]) + return {"ok": True, "quotes": quotes[:MAX_QUOTES]} + + +def _parse_document_bytes(filename: str, media_type: str, raw: bytes) -> dict[str, Any]: + if len(raw) > MAX_UPLOAD_BYTES: + return {"ok": False, "code": "upload_too_large", "message": f"Upload must be {MAX_UPLOAD_BYTES} bytes or smaller."} + text = raw.decode("utf-8-sig", errors="replace") + try: + if media_type == "application/json" or filename.lower().endswith(".json"): + data = json.loads(text) + rows = data.get("quotes", data) if isinstance(data, dict) else data + if not isinstance(rows, list): + raise ValueError("JSON must be a list or contain a quotes list") + quotes = [QuoteInput.model_validate(row).model_dump() for row in rows] + elif media_type == "text/csv" or filename.lower().endswith(".csv"): + reader = csv.DictReader(io.StringIO(text)) + quotes = [QuoteInput.model_validate(_coerce_quote_row(row)).model_dump() for row in reader] + else: + quotes = _parse_plain_text_quotes(text) + except Exception as exc: + return {"ok": False, "code": "quote_parse_failed", "message": f"Could not parse quote upload: {exc}"} + if not quotes: + return {"ok": False, "code": "no_quotes_found", "message": "No quote rows were found in the upload."} + return {"ok": True, "quotes": quotes} + + +def _coerce_quote_row(row: dict[str, Any]) -> dict[str, Any]: + aliases = { + "vendor": ["vendor", "supplier", "name"], + "quantity": ["quantity", "qty"], + "unit_price": ["unit_price", "price", "unit price", "unitPrice"], + "delivery_days": ["delivery_days", "delivery", "delivery days", "lead_time", "lead time"], + "warranty_months": ["warranty_months", "warranty", "warranty months"], + } + normalized = {str(k).strip().lower(): v for k, v in row.items()} + out: dict[str, Any] = {} + for target, names in aliases.items(): + for name in names: + if name.lower() in normalized and normalized[name.lower()] not in (None, ""): + out[target] = normalized[name.lower()] + break + return out + + +def _parse_plain_text_quotes(text: str) -> list[dict[str, Any]]: + quotes: list[dict[str, Any]] = [] + for line in text.splitlines(): + if not line.strip(): + continue + parts = [part.strip() for part in re.split(r"[,;|]", line) if part.strip()] + if len(parts) >= 5: + quotes.append( + QuoteInput.model_validate( + { + "vendor": parts[0], + "quantity": parts[1], + "unit_price": parts[2], + "delivery_days": parts[3], + "warranty_months": parts[4], + } + ).model_dump() + ) + return quotes + + +@contextmanager +def _db_conn() -> Any: + url = os.environ.get("DATABASE_URL") + if not url or psycopg is None: + yield None + return + conn = psycopg.connect(url, row_factory=dict_row) + try: + yield conn + conn.commit() + finally: + conn.close() + + +async def _save_comparison(tenant_key: str, payload: dict[str, Any]) -> None: + key = (tenant_key, payload["comparison_id"]) + with _db_conn() as conn: + if conn is None: + _LOCAL_COMPARISONS[key] = dict(payload) + return + with conn.cursor() as cur: + cur.execute( + """ + INSERT INTO quote_comparisons + (tenant_key, comparison_id, recommended_vendor, score, normalized_total, payload, updated_at) + VALUES (%s, %s, %s, %s, %s, %s, NOW()) + ON CONFLICT (tenant_key, comparison_id) DO UPDATE SET + recommended_vendor = EXCLUDED.recommended_vendor, + score = EXCLUDED.score, + normalized_total = EXCLUDED.normalized_total, + payload = EXCLUDED.payload, + updated_at = NOW() + """, + ( + tenant_key, + payload["comparison_id"], + payload["recommendation"]["vendor"], + payload["recommendation"]["score"], + payload["recommendation"]["normalized_total"], + json.dumps(payload), + ), + ) + + +async def _load_comparison(tenant_key: str, comparison_id: str) -> dict[str, Any] | None: + key = (tenant_key, comparison_id) + with _db_conn() as conn: + if conn is None: + return _LOCAL_COMPARISONS.get(key) + with conn.cursor() as cur: + cur.execute( + """ + SELECT payload + FROM quote_comparisons + WHERE tenant_key = %s AND comparison_id = %s + """, + (tenant_key, comparison_id), + ) + row = cur.fetchone() + if not row: + return None + payload = row["payload"] + return payload if isinstance(payload, dict) else json.loads(payload) + + +async def _persist_receipt( + *, + tenant_key: str, + comparison_id: str, + skill_name: str, + input_payload: dict[str, Any], + result_payload: dict[str, Any], + status: str, + started_at: str, +) -> dict[str, Any]: + receipt = { + "receipt_id": str(uuid.uuid4()), + "agent": QuoteJudgeStudioV1.name, + "agent_version": QuoteJudgeStudioV1.version, + "skill": skill_name, + "comparison_id": comparison_id, + "status": status, + "started_at": started_at, + "completed_at": _now_iso(), + "input_hash": _hash_json(input_payload), + "result_hash": _hash_json(result_payload), + } + with _db_conn() as conn: + if conn is None: + _LOCAL_RECEIPTS.append({"tenant_key": tenant_key, **receipt}) + return receipt + with conn.cursor() as cur: + cur.execute( + """ + INSERT INTO quote_execution_receipts + (tenant_key, comparison_id, receipt_id, skill_name, status, input_hash, + result_hash, payload, created_at) + VALUES (%s, %s, %s, %s, %s, %s, %s, %s, NOW()) + """, + ( + tenant_key, + comparison_id, + receipt["receipt_id"], + skill_name, + status, + receipt["input_hash"], + receipt["result_hash"], + json.dumps(receipt), + ), + ) + return receipt + + +def _hash_json(payload: dict[str, Any]) -> str: + encoded = json.dumps(payload, sort_keys=True, separators=(",", ":"), default=str).encode("utf-8") + return hashlib.sha256(encoded).hexdigest() + + +def _now_iso() -> str: + return datetime.now(timezone.utc).replace(microsecond=0).isoformat()