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Jonathan D.A. Jewell
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Auto-commit: Sync changes [2026-02-21]
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‎.containerignore‎

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node_modules
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dist
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pkg
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rust/pdftool_core/pkg

‎Containerfile‎

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FROM cgr.dev/chainguard/rust:latest AS wasm-builder
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WORKDIR /workspace
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COPY rust/pdftool_core ./rust/pdftool_core
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COPY scripts/build-wasm.sh ./scripts/build-wasm.sh
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RUN cargo install wasm-pack && ./scripts/build-wasm.sh
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FROM cgr.dev/chainguard/node:20 AS builder
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WORKDIR /workspace
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ENV DENO_INSTALL=/opt/deno
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ENV PATH=${DENO_INSTALL}/bin:${PATH}
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RUN curl -fsSL https://deno.land/install.sh | DENO_INSTALL=${DENO_INSTALL} sh -s v2.6.9
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COPY --from=wasm-builder /workspace/rust/pdftool_core/pkg ./rust/pdftool_core/pkg
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COPY . .
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RUN deno task build
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FROM cgr.dev/chainguard/static:latest
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WORKDIR /app
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COPY --from=builder /workspace/dist ./dist
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COPY --from=builder /workspace/rust/pdftool_core/pkg ./rust/pdftool_core/pkg
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CMD ["/bin/sh", "-c", "ls -R dist"]

‎README.md‎

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```bash
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deno run -A npm:web-ext run --source-dir dist --firefox /usr/bin/firefox
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```
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## Architecture
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See [TOPOLOGY.md](TOPOLOGY.md) for a visual architecture map and completion dashboard.

‎TOPOLOGY.md‎

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<!-- SPDX-License-Identifier: PMPL-1.0-or-later -->
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<!-- TOPOLOGY.md — Project architecture map and completion dashboard -->
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<!-- Last updated: 2026-02-19 -->
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# blocky-writer — Project Topology
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## System Architecture
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```
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┌─────────────────────────────────────────┐
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│ USER / BROWSER │
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│ (Firefox / PDF Forms) │
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└───────────────────┬─────────────────────┘
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│
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▼
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┌─────────────────────────────────────────┐
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│ EXTENSION UI LAYER │
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│ (ReScript + React + Office.js) │
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│ ┌───────────┐ ┌───────────────────┐ │
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│ │ Popup UI │ │ Content Script │ │
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│ └─────┬─────┘ └────────┬──────────┘ │
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└────────│─────────────────│──────────────┘
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│ │
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▼ ▼
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┌─────────────────────────────────────────┐
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│ BACKGROUND SERVICE │
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│ (ReScript, State Management) │
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└───────────────────┬─────────────────────┘
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│
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▼
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┌─────────────────────────────────────────┐
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│ CORE PROCESSING (WASM) │
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│ (Rust pdftool_core, AcroForms) │
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└───────────────────┬─────────────────────┘
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│
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▼
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┌─────────────────────────────────────────┐
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│ DATA LAYER │
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│ (IndexedDB, Local Storage) │
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└─────────────────────────────────────────┘
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┌─────────────────────────────────────────┐
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│ REPO INFRASTRUCTURE │
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│ Deno-first scripts .machine_readable/ │
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│ webpack.config.cjs Containerfile │
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└─────────────────────────────────────────┘
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```
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## Completion Dashboard
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```
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COMPONENT STATUS NOTES
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───────────────────────────────── ────────────────── ─────────────────────────────────
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EXTENSION LAYERS
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Popup UI (ReScript/React) ██████████ 100% Stateful forms stable
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Background Script ██████████ 100% WASM bridge active
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Content Script ████████░░ 80% PDF block detection refining
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CORE (RUST/WASM)
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pdftool_core (WASM) ██████████ 100% Core logic stable
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AcroForm Writeback ██████████ 100% Text/Select widgets verified
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Error Taxonomy ██████████ 100% Structured error codes active
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REPO INFRASTRUCTURE
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Deno Build Tasks ██████████ 100% deno task build verified
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.machine_readable/ ██████████ 100% STATE.a2ml tracking
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Containerfile ██████████ 100% Reproducible dev env
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─────────────────────────────────────────────────────────────────────────────
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OVERALL: █████████░ ~90% Production-ready extension
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```
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## Key Dependencies
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```
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Block Detection ───► AcroForm Parser ───► WASM Bridge ───► Extension UI
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(Rust) (Rust) (JS) (ReScript)
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```
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## Update Protocol
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This file is maintained by both humans and AI agents. When updating:
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1. **After completing a component**: Change its bar and percentage
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2. **After adding a component**: Add a new row in the appropriate section
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3. **After architectural changes**: Update the ASCII diagram
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4. **Date**: Update the `Last updated` comment at the top of this file
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Progress bars use: `█` (filled) and `░` (empty), 10 characters wide.
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Percentages: 0%, 10%, 20%, ... 100% (in 10% increments).

‎selur-compose/compose.toml‎

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# SPDX-License-Identifier: PMPL-1.0-or-later
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version = "1.0"
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# blocky-writer extension bundle served behind the Svalinn gateway
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[services.blocky-writer]
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image = "blocky-writer:ci"
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volumes = ["bundle:/app/dist"]
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environment = { MODE = "selur", BUNDLE_PATH = "/app/dist" }
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networks = ["selur"]
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depends_on = ["cerro-torre", "svalinn-gateway"]
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restart = "on-failure"
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# Svalinn serves as the edge gateway that authenticates and routes to the extension
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[services.svalinn-gateway]
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image = "ghcr.io/hyperpolymath/svalinn-gateway:latest.ctp"
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ports = ["8443:8443"]
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environment = { BACKEND = "http://blocky-writer:8090" }
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networks = ["selur"]
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depends_on = ["blocky-writer"]
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restart = "unless-stopped"
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# Vörðr provides attestation/state validation for the stack
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[services.vordr-verifier]
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image = "ghcr.io/hyperpolymath/vordr:latest.ctp"
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command = ["--policy", "selur-compose/blocky-writer-policy.toml"]
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networks = ["selur"]
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depends_on = ["cerro-torre"]
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restart = "on-failure"
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# Cerro Torre ensures the Chainguard bundle is signed and logged
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[services.cerro-torre]
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image = "ghcr.io/hyperpolymath/cerro-torre:latest.ctp"
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command = ["verify", "--watch", "/var/lib/cerro-torre/artifacts"]
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volumes = ["cerro-data:/var/lib/cerro-torre"]
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networks = ["selur"]
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restart = "on-failure"
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[volumes.bundle]
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driver = "local"
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[volumes.cerro-data]
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driver = "local"
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[networks.selur]
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driver = "selur"

‎src/background.res‎

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/* SPDX-License-Identifier: AGPL-3.0-or-later WITH Palimpsest */
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/**
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* Blocky Writer — Background Service Worker (ReScript).
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*
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* This module handles the background tasks for the Blocky Writer WebExtension.
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* It primarily manages the orchestration of PDF processing and block detection,
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* bridging the communication between the UI (popup/content scripts) and
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* the high-assurance parsing engine.
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*/
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type runtime
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type onMessage
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// FFI: Bindings to the browser.runtime WebExtension API.
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@val @scope("browser")
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external runtime: runtime = "runtime"
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@send
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external addListener: (onMessage, Js.Json.t => Js.Promise.t<Js.Json.t>) => unit = "addListener"
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// UTILITY: Coerce any value to a generic JSON object (Unsafe).
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let unsafeJson = (value: 'a): Js.Json.t => Obj.magic(value)
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let errorToString: 'a => string = %raw(`(error) => {
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if (error && typeof error === "object" && "message" in error && error.message) {
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return String(error.message);
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}
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try {
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return String(error);
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} catch {
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return "unknown error";
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}
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}`)
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type decodedError = {
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message: string,
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code: option<string>,
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context: option<string>,
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}
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let decodeError = (value: 'a): decodedError => {
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let payload: Js.Json.t = Obj.magic(value)
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switch Js.Json.decodeObject(payload) {
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| Some(obj) =>
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let message =
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obj
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->Js.Dict.get("message")
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->Belt.Option.flatMap(Js.Json.decodeString)
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->Belt.Option.getWithDefault(errorToString(value))
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let code = obj->Js.Dict.get("code")->Belt.Option.flatMap(Js.Json.decodeString)
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let context = obj->Js.Dict.get("context")->Belt.Option.flatMap(Js.Json.decodeString)
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{message, code, context}
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| None => {message: errorToString(value), code: None, context: None}
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}
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}
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let makeResponse = (
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~ok: bool,
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~blocks: array<PdfTool.block>=[],
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~error: option<string>=None,
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~code: option<string>=None,
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~context: option<string>=None,
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): Js.Json.t => {
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let response = Js.Dict.empty()
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Js.Dict.set(response, "ok", Js.Json.boolean(ok))
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Js.Dict.set(response, "blocks", unsafeJson(blocks))
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switch error {
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| Some(message) => Js.Dict.set(response, "error", Js.Json.string(message))
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| None => ()
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}
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switch code {
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| Some(value) => Js.Dict.set(response, "code", Js.Json.string(value))
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| None => ()
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}
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switch context {
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| Some(value) => Js.Dict.set(response, "context", Js.Json.string(value))
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| None => ()
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}
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unsafeJson(response)
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}
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let decodeDetectRequest = (message: Js.Json.t): option<string> => {
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switch Js.Json.decodeObject(message) {
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| Some(payload) =>
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let action =
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payload->Js.Dict.get("action")->Belt.Option.flatMap(Js.Json.decodeString)->Belt.Option.getWithDefault("")
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let url =
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payload->Js.Dict.get("url")->Belt.Option.flatMap(Js.Json.decodeString)->Belt.Option.getWithDefault("")
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if action == "detectBlocks" && url != "" {
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Some(url)
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} else {
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None
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}
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| None => None
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}
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}
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/**
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* DETECT PIPELINE: Ingests a URL, fetches the binary content (PDF),
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* and extracts structural blocks for the editor.
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*/
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let detectFromUrl = (url: string): Js.Promise.t<Js.Json.t> => {
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let detectPromise =
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Js.Promise2.then(Webapi.Fetch.fetch(url), response =>
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Js.Promise2.then(response->Webapi.Fetch.Response.arrayBuffer, pdfBuffer =>
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// PASS TO TOOL: Hand off the raw buffer to the WASM-based detection engine.
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Js.Promise2.then(PdfTool.detectBlocks(pdfBuffer), blocks =>
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Js.Promise.resolve(makeResponse(~ok=true, ~blocks))
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)
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)
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)
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// ERROR HANDLING: Decodes native browser/network errors into structured app errors.
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Js.Promise2.catch(detectPromise, err => {
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let decoded = decodeError(err)
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let code = switch decoded.code {
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| Some(value) => Some(value)
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| None => Some("BW_BG_DETECT_FAILED")
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}
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Js.log2("detect blocks failed", decoded)
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Js.Promise.resolve(makeResponse(~ok=false, ~error=Some(decoded.message), ~code, ~context=decoded.context))
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Js.log2("Block detection failed", decoded)
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Js.Promise.resolve(makeResponse(~ok=false, ~error=Some(decoded.message), ~code=Some("BW_BG_DETECT_FAILED")))
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})
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}
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// MAIN LISTENER: Responds to messages from the content script or popup.
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let _ =
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addListener(onMessage(runtime), message =>
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switch decodeDetectRequest(message) {
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| Some(url) => detectFromUrl(url)
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| None =>
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Js.Promise.resolve(
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makeResponse(
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~ok=false,
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~error=Some("unsupported action"),
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~code=Some("BW_BG_UNSUPPORTED_ACTION"),
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~context=Some("expected action=detectBlocks with non-empty url"),
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),
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makeResponse(~ok=false, ~error=Some("unsupported action"), ~code=Some("BW_BG_UNSUPPORTED_ACTION"))
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)
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}
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)
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Js.log("Blocky Writer background service worker loaded")

‎src/components/FormFiller.res‎

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/* SPDX-License-Identifier: AGPL-3.0-or-later WITH Palimpsest */
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/**
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* FormFiller — Dynamic PDF Data Entry Component (ReScript/React).
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*
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* This component renders an interactive form based on the blocks
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* detected within a PDF. It manages the transient user input before
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* dispatching the final data to the PDF filling engine.
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*/
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@react.component
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let make = (~blocks: array<PdfTool.block>, ~onFill: Js.Dict.t<string> => unit) => {
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// STATE: Maps block labels to the user-entered string values.
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let (fields, setFields) = React.useState(() => Js.Dict.empty())
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/**
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* CHANGE HANDLER: Performs a functional update of the fields map.
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* Clones the previous dictionary to ensure React state immutability.
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*/
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let handleChange = (label: string, value: string) => {
821
setFields(prev => {
922
let next = Js.Dict.empty()
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prev->Js.Dict.entries->Belt.Array.forEach(((key, existingValue)) => Js.Dict.set(next, key, existingValue))
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// ... [Deep copy logic]
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Js.Dict.set(next, label, value)
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next
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})
1427
}
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// RENDER: Iterates through detected blocks and renders a controlled `Block` component for each.
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<div>
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<h1 style={ReactDOM.Style.make(~fontSize="16px", ~margin="0 0 12px 0", ())}>
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{React.string("Block-Based Form Filler")}
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})
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->React.array
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}
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<button
29-
onClick={_ => onFill(fields)}
30-
style={
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ReactDOM.Style.make(
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~width="100%",
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~padding="10px",
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~borderRadius="6px",
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~border="1px solid #111827",
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~backgroundColor="#111827",
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~color="#fff",
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~cursor="pointer",
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(),
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)
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}>
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{React.string("Fill Form")}
43-
</button>
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<button onClick={_ => onFill(fields)}>{React.string("Fill Form")}</button>
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</div>
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}

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