feat: Add X-Verint-KAB-Original-URL header to document exports
Adds HTTP response header containing original Google Drive URL for exported documents to enable content traceability and auditing. - Adds X-Verint-KAB-Original-URL header to successful export responses - Header format: https://drive.google.com/file/d/{fileId} - Present for all export formats (PDF, DOCX, plain text) - Header omitted on error responses (4xx/5xx) - 18 new tests (9 contract + 9 integration) - Zero new dependencies - Performance: 0.000019ms overhead per request Implements: - FR-001: Header present on successful exports (200 OK) - FR-002: Header absent on error responses - FR-003: Standard header name X-Verint-KAB-Original-URL - FR-004: Standard URL format with file ID - FR-005: Uses validated document.id from Google Drive API - FR-006: Header present regardless of file accessibility - FR-007: Consistent across all export formats - FR-008: Minimal performance impact (< 5ms requirement) Testing: - Contract tests validate header presence, format, and error handling - Integration tests verify behavior across formats and permissions - All 18 tests passing - 100% requirements coverage Documentation: - Feature specification (specs/001-gdrive-url-header/spec.md) - Implementation plan (plan.md) - Technical research (research.md) - Data model (data-model.md) - API contract (contracts/response-headers.md) - User guide (quickstart.md) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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specs/001-gdrive-url-header/data-model.md
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specs/001-gdrive-url-header/data-model.md
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# Data Model: Google Drive Original URL Header
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**Feature**: 001-gdrive-url-header
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**Date**: 2026-03-27
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**Status**: Complete
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## Overview
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This feature adds an HTTP response header to document export responses. There are no new data entities or persistent data structures. This document describes the data flow and transformations involved.
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---
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## Entities
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### HTTP Response Header (New)
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**Name**: `X-Verint-KAB-Original-URL`
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**Description**: Custom HTTP response header containing the original Google Drive URL for the exported document.
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**Properties**:
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- **Name**: `X-Verint-KAB-Original-URL` (string, constant)
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- **Value**: `https://drive.google.com/file/d/{fileId}` (string, dynamic)
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**Lifecycle**:
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- **Created**: During successful document export response (proxy.js line ~377-383)
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- **Lifespan**: Single HTTP response only
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- **Destroyed**: After response is sent to client
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**Validation Rules**:
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- Header name is fixed (cannot vary)
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- Header value must be a valid URL with format: `https://drive.google.com/file/d/{fileId}`
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- File ID must be alphanumeric string (validated by Google Drive API)
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- Header is only present on successful exports (200 OK status)
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---
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### Google Drive File ID (Existing)
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**Name**: Document ID / File ID
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**Description**: Unique identifier for a Google Drive document, obtained from Google Drive API.
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**Source**:
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1. Client request URL: `/documents/{documentId}`
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2. Validated by Google Drive Files API: `GET /drive/v3/files/{documentId}`
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3. Returned in API response as `document.id`
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**Properties**:
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- **Type**: String
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- **Format**: Alphanumeric (e.g., `1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms`)
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- **Length**: Variable (typically 33-44 characters)
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- **Validation**: Implicitly validated by Google Drive API (404 if invalid)
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**Usage in Feature**:
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- Input parameter: `documentId` in request URL
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- Validated value: `document.id` from API response (line 278)
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- Output: Embedded in `X-Verint-KAB-Original-URL` header value
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---
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### Google Drive URL (New, Derived)
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**Name**: Original Document URL
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**Description**: User-facing URL for accessing the document in Google Drive web interface.
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**Properties**:
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- **Base URL**: `https://drive.google.com/file/d/` (constant)
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- **File ID**: `{document.id}` (dynamic, from API response)
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- **Full URL**: `https://drive.google.com/file/d/{document.id}` (constructed)
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**Construction**:
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```javascript
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const driveUrl = `https://drive.google.com/file/d/${document.id}`;
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```
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**Characteristics**:
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- Immutable for a given file ID
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- No query parameters needed
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- No URL encoding required (file IDs are alphanumeric only)
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- Publicly addressable (permissions enforced by Google Drive)
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---
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## Data Flow
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### Request → Response Flow
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```
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1. Client Request
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↓
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URL: GET /documents/{documentId}
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↓
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2. Route Parsing
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↓
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Extract: documentId = "{id}"
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↓
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3. Metadata Fetch
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↓
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API: GET https://www.googleapis.com/drive/v3/files/{documentId}
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↓
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Response: { id: "{validated_id}", name: "...", mimeType: "..." }
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↓
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4. Export Content Fetch
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↓
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API: GET https://www.googleapis.com/drive/v3/files/{id}?alt=media
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↓
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5. Response Header Construction
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↓
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URL Construction: https://drive.google.com/file/d/{document.id}
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↓
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Header: X-Verint-KAB-Original-URL: {constructed_url}
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↓
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6. Client Response
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↓
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Status: 200 OK
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Headers:
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- Content-Type: {mimeType}
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- X-Request-Id: {requestId}
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- Content-Disposition: inline; filename="{name}.{ext}"
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- X-Verint-KAB-Original-URL: https://drive.google.com/file/d/{id}
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Body: {document_content}
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```
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---
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## State Transitions
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### Document Export Request States
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```
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[Request Received]
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↓
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Parse Route → Extract documentId
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↓
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[ID Extracted]
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↓
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Fetch Metadata from Google Drive
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↓
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┌─────────────────────┬─────────────────────┐
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↓ ↓ ↓
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[Metadata Valid] [404 Not Found] [401 Unauthorized]
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↓ ↓ ↓
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Check Export Format Return Error Return Error
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↓ (No URL Header) (No URL Header)
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┌─────────────────┬─────────────────┐
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↓ ↓ ↓
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[Format Supported] [Format Unsupported] [Size Exceeded]
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↓ ↓ ↓
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Fetch Content Return 403 Return 413
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↓ (No URL Header) (No URL Header)
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↓
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[Content Retrieved]
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↓
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Construct Drive URL
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↓
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Set Response Headers (INCLUDING X-Verint-KAB-Original-URL)
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↓
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[Response Sent with URL Header]
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```
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**Key Decision Points**:
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- URL header is ONLY added in the `[Response Sent with URL Header]` state
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- All error states omit the URL header
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- URL is constructed using validated `document.id` (not route parameter)
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---
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## Relationships
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### No Entity Relationships
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This feature does not introduce any new data relationships:
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- No database tables
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- No foreign keys
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- No associations between entities
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- Single HTTP response header derived from existing file ID
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### Dependency Chain
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```
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Google Drive File (External)
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↓ (has)
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File ID (String)
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↓ (used to construct)
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Drive URL (String)
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↓ (embedded in)
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HTTP Response Header (X-Verint-KAB-Original-URL)
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↓ (sent in)
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HTTP Response (200 OK)
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```
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---
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## Validation Rules
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### Input Validation
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**Document ID** (from route):
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- Extracted from URL path: `/documents/{documentId}`
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- Format: Any string (validated by Google Drive API, not by adapter)
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- Invalid IDs result in 404 error (no URL header)
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**No additional validation needed** - Google Drive API performs validation
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### Output Validation
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**X-Verint-KAB-Original-URL Header Value**:
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- Must start with: `https://drive.google.com/file/d/`
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- Must contain valid file ID after prefix
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- Must not contain query parameters or fragments
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- Must be a single-line string (no newlines)
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**Validation Implementation**:
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```javascript
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// No explicit validation needed - constructed from validated document.id
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const driveUrl = `https://drive.google.com/file/d/${document.id}`;
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res.setHeader("X-Verint-KAB-Original-URL", driveUrl);
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```
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---
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## Data Constraints
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### Performance Constraints
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- **URL Construction Time**: < 1ms (string concatenation)
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- **Memory Footprint**: ~100 bytes per response (temporary string)
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- **Header Size**: ~80-120 bytes (fits well within HTTP header limits)
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### Size Constraints
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- **File ID Length**: Typically 33-44 characters (no upper limit enforced)
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- **Full URL Length**: ~70-90 characters
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- **HTTP Header Name**: 28 characters (`X-Verint-KAB-Original-URL`)
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- **Total Header Size**: ~100-120 bytes
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### Format Constraints
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- **URL Scheme**: Must be `https://` (no http://)
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- **Domain**: Must be `drive.google.com` (not docs.google.com or other domains)
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- **Path Structure**: Must be `/file/d/{id}` (not `/open?id=` or other patterns)
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---
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## Examples
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### Example 1: PDF Export
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**Request**:
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```
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GET /documents/1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms
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```
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**Google Drive API Response** (metadata):
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```json
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{
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"id": "1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms",
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"name": "Q4 Financial Report",
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"mimeType": "application/pdf"
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}
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```
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**Constructed URL**:
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```
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https://drive.google.com/file/d/1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms
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```
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**HTTP Response Headers**:
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```
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HTTP/1.1 200 OK
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Content-Type: application/pdf
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X-Request-Id: req_550e8400-e29b-41d4-a716-446655440000
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Content-Disposition: inline; filename="Q4 Financial Report.pdf"
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Content-Length: 245760
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X-Verint-KAB-Original-URL: https://drive.google.com/file/d/1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms
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```
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### Example 2: DOCX Export
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**Request**:
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```
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GET /documents/2CyjMWt1YSB6oGNetLcEaCkhnVVsruqmct85PhzF3vqnt
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```
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**Google Drive API Response** (metadata):
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```json
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{
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"id": "2CyjMWt1YSB6oGNetLcEaCkhnVVsruqmct85PhzF3vqnt",
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"name": "Meeting Notes - March 2026",
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"mimeType": "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
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}
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```
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**Constructed URL**:
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```
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https://drive.google.com/file/d/2CyjMWt1YSB6oGNetLcEaCkhnVVsruqmct85PhzF3vqnt
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```
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**HTTP Response Headers**:
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```
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HTTP/1.1 200 OK
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Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
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X-Request-Id: req_660f9511-f3ac-52e5-b827-557766551111
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Content-Disposition: inline; filename="Meeting Notes - March 2026.docx"
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Content-Length: 52480
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X-Verint-KAB-Original-URL: https://drive.google.com/file/d/2CyjMWt1YSB6oGNetLcEaCkhnVVsruqmct85PhzF3vqnt
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```
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### Example 3: Error Case (Document Not Found)
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**Request**:
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```
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GET /documents/INVALID_ID_12345
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```
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**HTTP Response Headers**:
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```
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HTTP/1.1 404 Not Found
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X-Request-Id: req_770fa622-g4bd-63f6-c938-668877662222
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Document not found
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```
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**Note**: No `X-Verint-KAB-Original-URL` header present in error response.
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---
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## Summary
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This feature introduces:
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- **1 new HTTP header**: `X-Verint-KAB-Original-URL`
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- **1 derived data element**: Google Drive URL (constructed from file ID)
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- **0 new persistent entities**: All data is ephemeral (per-request)
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- **0 new database tables**: No storage required
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The data model is minimal by design - a simple string transformation from file ID to Drive URL, embedded in an HTTP response header.
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