BinectChromePrd

*Product Requirements Document*

# **Product Requirements Document (PRD)**

## **Project: BinectChrome**

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## 1. Product Overview

### 1.1 Purpose

**BinectChrome** is a Google Chrome extension that enables users to send PDF documents generated in arbitrary cloud applications directly to Binect for physical printing and postal delivery.

It eliminates the manual **download → upload** workflow by adding a lightweight, privacy-preserving integration layer in the browser — without requiring changes to the originating application (A).

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### 1.2 Problem Statement

Users frequently generate PDF documents (letters, invoices, notices) in cloud applications that are **not integrated** with postal mail services.

Today, the workflow requires:

1. Downloading the PDF from application A
2. Uploading the PDF to application B (Binect)
3. Repeating this for every document

This causes friction, errors, and unnecessary time loss.

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### 1.3 Solution Summary

BinectChrome:

* Detects PDF downloads (and supported in-browser PDF views)
* Offers a **“Send PDF to Binect”** action
* Securely transfers the PDF to Binect via its API
* Requires explicit user intent
* Stores no PDF content
* Tracks transfers locally for transparency and support

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## 2. Goals & Non-Goals

### 2.1 Goals

* Reduce friction when sending PDFs to physical mail
* Require **no integration changes** in source systems (A)
* Preserve user privacy and trust
* Be simple, reliable, and auditable
* Minimize permissions and attack surface

### 2.2 Non-Goals

* No automation or RPA of third-party websites
* No shared identity or credential federation
* No document content storage or analysis
* No backend relay service
* No multi-browser support in v1 (Chrome only)

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## 3. Target Users

* Business users producing PDFs in cloud applications
* Office workers sending recurring physical mail
* Compliance-conscious users who require explicit control
* Chrome-based desktop workflows

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## 4. Functional Requirements

### 4.1 PDF Detection

#### 4.1.1 PDF Downloads (MUST)

* Detect completed PDF downloads using Chrome Downloads API
* Identification via:

  * `.pdf` filename extension
  * or response headers (`Content-Type: application/pdf`)

#### 4.1.2 PDF Viewed in Browser (SHOULD)

* Detect navigation to resources with `Content-Type: application/pdf`
* Applies when PDFs are loaded as normal URLs

**Accepted limitation:**
PDFs rendered via blob URLs or complex JavaScript viewers may not be detectable or retrievable.

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### 4.2 User Interaction & Sending

#### 4.2.1 Toolbar & Popup (MUST)

* Chrome toolbar icon opens popup
* Popup shows:

  * Last detected PDF (filename, size, timestamp, source domain)
  * Primary action: **Send PDF to Binect**

#### 4.2.2 Explicit User Intent (MUST)

* PDFs are only sent after a deliberate user click
* No automatic sending by default

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### 4.3 PDF Transfer

#### 4.3.1 PDF Acquisition (MUST for downloads)

* Extension retrieves PDF bytes for transfer:

  * Prefer re-fetching from original URL using user session
  * Fallback mechanisms may be implemented as needed

#### 4.3.2 Upload to Binect (MUST)

* Transfer PDF to Binect via official API
* Show clear progress and result states:

  * Uploading
  * Success
  * Failure (with actionable error message)

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### 4.4 Authentication & Credential Handling

#### 4.4.1 Authentication Method (MUST)

* Username + password authentication to Binect API

#### 4.4.2 Secure Storage (MUST)

* Credentials stored encrypted at rest in extension storage
* Decrypted credentials only held in memory during use

#### 4.4.3 Retention Policy (MUST)

* Credentials retained for **60 days since last successful use**
* “Use” = successful authentication or successful send
* After 60 days of inactivity:

  * Credentials are automatically deleted
  * User must re-enter credentials

#### 4.4.4 Manual Controls (MUST)

* User can manually wipe stored credentials at any time
* Optional “Lock now” to clear decrypted credentials from memory

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### 4.5 Privacy & Data Handling

#### 4.5.1 PDF Content (MUST)

* Extension never stores PDF files
* Extension never reports PDF content
* PDFs are only transmitted to Binect upon explicit send

#### 4.5.2 Metadata Minimization (MUST)

* No content inspection
* No filename persistence required
* Only filesize and technical metadata are tracked

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### 4.6 Local Tracking (“Score”)

#### 4.6.1 Tracking Scope (MUST)

Tracking data stored **locally only**:

* Timestamp
* Source A identifier (URL or domain)
* Destination B URL
* PDF filesize
* Result (success / failure + error class)

#### 4.6.2 Tracking Access (MUST)

* Tracking view accessible via **“?” Info/Help** link in popup
* Shows:

  * Summary counts
  * Chronological list of transfers

#### 4.6.3 Retention (SHOULD)

* Cap number of entries (e.g. last 500 events)
* Prevent unbounded growth

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### 4.7 Feature Requests & Feedback

#### 4.7.1 Feedback Mechanism (MUST)

* “Request features / report issue” link
* Opens email draft to:
  **[bernd.worsch@binect.de](mailto:bernd.worsch@binect.de)**

#### 4.7.2 Tracking Export (MUST)

* Tracking data prepared as CSV
* CSV data:

  * Embedded in email body and/or
  * Copied to clipboard automatically
* Optional “Download CSV” button

**Note:**
Direct file attachments via `mailto:` are not reliably supported by browsers and are therefore not required.

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## 5. Installation & Distribution

### 5.1 Distribution Channel (MUST)

* Automated publication via **Chrome Web Store**

### 5.2 Installation Requirements

* Chrome browser (desktop)
* User installs extension from Chrome Web Store
* User grants required permissions explicitly

### 5.3 Permissions (Principle of Least Privilege)

Expected permissions include:

* `downloads`
* `storage`
* `activeTab` (optional)
* Host permission for Binect API endpoint

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## 6. Deinstallation & Cleanup

### 6.1 User-Initiated Deinstallation (MUST)

* When extension is removed:

  * All stored credentials are deleted
  * All local tracking data is deleted
  * No data remains outside the browser

### 6.2 No External State (MUST)

* No server-side state tied to installation
* No orphaned accounts or tokens

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## 7. Technical Constraints

* Chrome Extension Manifest V3
* No background persistence beyond service worker lifecycle
* No external backend services
* No cross-browser guarantees in v1

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## 8. Security Considerations

* Encrypted credential storage
* No silent background transfers
* Clear user confirmation before sending
* No hidden data flows
* Minimal permissions to pass Chrome Web Store review

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## 9. Success Metrics

* Reduction in manual upload steps
* Successful sends per active user
* Low error rate
* No privacy or security incidents
* Positive user feedback via feature request channel

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## 10. Future Considerations (Out of Scope for v1)

* Multi-profile destinations
* Rule-based automation (opt-in)
* Multi-browser support (Firefox, Edge)
* Token-based authentication (if API evolves)
* Organization-level deployment policies

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**BinectChrome** is intentionally modest in scope:
a focused, trustworthy bridge between modern cloud software and physical mail — implemented where the user already works: the browser.


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