commit 46ed03ac31af2b12ef5199c261e9cefdaf4e621b
Author: Eduardo Dorado <dorado105@gmail.com>
Date:   Thu May 21 09:34:45 2026 -0300

    feat: initial zpl pdf microservice

diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,12 @@
+node_modules/
+.cache/
+node-v24.15.0/
+
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+.env
+.env.*
+!.env.example
diff --git a/AGENTS.md b/AGENTS.md
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+++ b/AGENTS.md
@@ -0,0 +1,27 @@
+# ZPL to PDF Microservice - Agent Orchestration
+
+Este microservicio actúa como un sidecar local para el ecosistema GT:Sync / Pampero. Resuelve la incompatibilidad de versiones de Node.js en el backend principal (Next.js con Node 12), renderizando etiquetas ZPL a formato PDF de forma aislada y 100% offline utilizando un entorno gráfico simulado en memoria.
+
+## Infraestructura y Ejecución
+
+- **Puerto del servicio:** `3040`
+- **Host:** `127.0.0.1` (Localhost)
+- **Motor Node:** Binario aislado (v24.15.0) para no afectar el PATH global.
+- **Core Stack:** `fastify` (Web Server), `zpl-js` (Parser), `canvas` (Render gráfico), `jspdf` (Exportación binaria).
+
+## Control De Versiones
+
+- **Repositorio oficial Gitea:** `https://gitea.globaltechscm.com/gt-microservices/zpl-pdf-microservice.git`
+- Este microservicio usa Gitea, no Bonobo. Para este proyecto, configurar siempre `origin` contra el remoto Gitea anterior.
+- No versionar `node_modules/`, `.cache/` ni el runtime local `node-v24.15.0/`. El runtime aislado se instala/restaura localmente en la ruta documentada abajo.
+
+### Ruta Absoluta del Intérprete
+Para ejecutar el servidor o instalar paquetes a través de PM2 o consola, se DEBE utilizar obligatoriamente la siguiente ruta absoluta:
+`C:\Users\Dorado\Desktop\Pampero\Proyectos\zpl-pdf-microservice\node-v24.15.0\node.exe`
+
+### Comandos de Gestión (Usar CMD/PowerShell)
+
+**Levantar el servicio manualmente:**
+```powershell
+C:\Users\Dorado\Desktop\Pampero\Proyectos\zpl-pdf-microservice\node-v24.15.0\node.exe server.js
+```
diff --git a/example/etiqueta.pdf b/example/etiqueta.pdf
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Binary files /dev/null and b/example/etiqueta.pdf differ
diff --git a/package-lock.json b/package-lock.json
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--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1319 @@
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+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
+    "node_modules/utrie": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/utrie/-/utrie-1.0.2.tgz",
+      "integrity": "sha512-1MLa5ouZiOmQzUbjbu9VmjLzn1QLXBhwpUa7kdLUQK+KQ5KA9I1vk5U4YHe/X2Ch7PYnJfWuWT+VbuxbGwljhw==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "base64-arraybuffer": "^1.0.2"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    },
+    "node_modules/zpl-js": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/zpl-js/-/zpl-js-0.1.5.tgz",
+      "integrity": "sha512-SEGBw2LZ51bOIkCLTB69hCQUryGyomQ+Rbz1naS9yM/wypv3Ph/S4hlEail+9ujwQu1bRgfAp59UzqgV27OgzQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@bwip-js/browser": "^4.5.2"
+      },
+      "peerDependencies": {
+        "react": "^16.9.0 || ^17 || ^18 || ^19"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..904c8dd
--- /dev/null
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "zpl-pdf-microservice",
+  "version": "1.0.0",
+  "description": "",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "check": "node --check server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "dependencies": {
+    "canvas": "^3.2.3",
+    "fastify": "^5.8.5",
+    "jspdf": "^4.2.1",
+    "zpl-js": "^0.1.5"
+  }
+}
diff --git a/server.js b/server.js
new file mode 100644
index 0000000..9426c18
--- /dev/null
+++ b/server.js
@@ -0,0 +1,679 @@
+"use strict";
+
+const fastify = require("fastify");
+const { createCanvas } = require("canvas");
+const { jsPDF } = require("jspdf");
+const { TextDecoder } = require("util");
+
+const HOST = "127.0.0.1";
+const PORT = 3040;
+const PAGE_PADDING_DOTS = 24;
+const DEFAULT_RENDER_OPTIONS = {
+  width: 4,
+  height: 6,
+  dpi: 203,
+  sourceDpi: 203,
+  fontWidthScale: 0.82,
+};
+
+let bwipPromise;
+
+function normalizeZpl(zpl) {
+  return zpl.replace(/\\n/g, "\n").replace(/\r\n/g, "\n");
+}
+
+function nextCommandIndex(zpl, start) {
+  const caret = zpl.indexOf("^", start);
+  const tilde = zpl.indexOf("~", start);
+
+  if (caret === -1) return tilde;
+  if (tilde === -1) return caret;
+  return Math.min(caret, tilde);
+}
+
+function tokenizeZpl(zpl) {
+  const tokens = [];
+  let index = 0;
+
+  while (index < zpl.length) {
+    const markerIndex = nextCommandIndex(zpl, index);
+    if (markerIndex === -1 || markerIndex + 2 >= zpl.length) break;
+
+    const marker = zpl[markerIndex];
+    let code;
+    let paramsStart;
+
+    if (marker === "^" && zpl[markerIndex + 1] === "A" && zpl[markerIndex + 2] !== "@") {
+      code = "^A";
+      paramsStart = markerIndex + 2;
+    } else {
+      code = marker + zpl.slice(markerIndex + 1, markerIndex + 3);
+      paramsStart = markerIndex + 3;
+    }
+
+    const paramsEnd = nextCommandIndex(zpl, paramsStart);
+    const rawParams = zpl.slice(paramsStart, paramsEnd === -1 ? zpl.length : paramsEnd);
+
+    tokens.push({ code, params: rawParams.replace(/\n/g, "") });
+    index = paramsEnd === -1 ? zpl.length : paramsEnd;
+  }
+
+  return tokens;
+}
+
+function splitParams(value) {
+  return String(value || "").split(",");
+}
+
+function parseInteger(value, fallback = 0) {
+  const parsed = Number.parseInt(value, 10);
+  return Number.isFinite(parsed) ? parsed : fallback;
+}
+
+function parseFont(params, currentFont) {
+  const match = String(params || "").match(/^([A-Z0-9])?([NRIB])?,?(\d+)?,?(\d+)?/i);
+
+  return {
+    name: match && match[1] ? match[1] : currentFont.name,
+    orientation: match && match[2] ? match[2].toUpperCase() : "N",
+    height: match && match[3] ? parseInteger(match[3], currentFont.height) : currentFont.height,
+    width: match && match[4] ? parseInteger(match[4], currentFont.width) : currentFont.width,
+  };
+}
+
+function normalizeRenderOptions(options = {}) {
+  const width = Number(options.width ?? DEFAULT_RENDER_OPTIONS.width);
+  const height = Number(options.height ?? DEFAULT_RENDER_OPTIONS.height);
+  const dpi = Number(options.dpi ?? DEFAULT_RENDER_OPTIONS.dpi);
+  const sourceDpi = Number(options.sourceDpi ?? DEFAULT_RENDER_OPTIONS.sourceDpi);
+  const fontWidthScale = Number(options.fontWidthScale ?? DEFAULT_RENDER_OPTIONS.fontWidthScale);
+
+  return {
+    width: Number.isFinite(width) && width > 0 ? width : DEFAULT_RENDER_OPTIONS.width,
+    height: Number.isFinite(height) && height > 0 ? height : DEFAULT_RENDER_OPTIONS.height,
+    dpi: Number.isFinite(dpi) && dpi > 0 ? dpi : DEFAULT_RENDER_OPTIONS.dpi,
+    sourceDpi: Number.isFinite(sourceDpi) && sourceDpi > 0 ? sourceDpi : DEFAULT_RENDER_OPTIONS.sourceDpi,
+    fontWidthScale: Number.isFinite(fontWidthScale) && fontWidthScale > 0
+      ? fontWidthScale
+      : DEFAULT_RENDER_OPTIONS.fontWidthScale,
+  };
+}
+
+function createRenderContext(options = {}) {
+  const normalized = normalizeRenderOptions(options);
+
+  return {
+    ...normalized,
+    widthDots: Math.round(normalized.width * normalized.dpi),
+    minHeightDots: Math.round(normalized.height * normalized.dpi),
+    sourceWidthDots: Math.round(normalized.width * normalized.sourceDpi),
+    scale: normalized.dpi / normalized.sourceDpi,
+  };
+}
+
+function decodeFieldHex(value) {
+  const decoder = new TextDecoder("utf-8");
+  let output = "";
+  let bytes = [];
+
+  const flush = () => {
+    if (bytes.length > 0) {
+      output += decoder.decode(Uint8Array.from(bytes));
+      bytes = [];
+    }
+  };
+
+  for (let index = 0; index < value.length; index += 1) {
+    if (value[index] === "_" && /^[0-9A-Fa-f]{2}$/.test(value.slice(index + 1, index + 3))) {
+      bytes.push(Number.parseInt(value.slice(index + 1, index + 3), 16));
+      index += 2;
+      continue;
+    }
+
+    flush();
+    output += value[index];
+  }
+
+  flush();
+  return output;
+}
+
+function decodeFieldData(value, fieldHex) {
+  return fieldHex ? decodeFieldHex(value) : value;
+}
+
+function createInitialState() {
+  return {
+    homeX: 0,
+    homeY: 0,
+    x: 0,
+    y: 0,
+    font: { name: "0", orientation: "N", height: 30, width: 30 },
+    block: null,
+    fieldHex: false,
+    barcode: null,
+    barcodeDefaults: { moduleWidth: 2, ratio: 3, height: 10 },
+  };
+}
+
+function addOperation(operations, operation) {
+  operations.push(operation);
+}
+
+function estimateTextHeight(operation) {
+  const maxLines = operation.block ? operation.block.maxLines : 1;
+  return Math.max(operation.font.height, operation.font.height * maxLines * 1.15);
+}
+
+function estimateGraphicHeight(operation) {
+  if (operation.type === "box") {
+    return Math.max(operation.height, operation.thickness || 1);
+  }
+
+  if (operation.type === "graphic") {
+    return operation.rows;
+  }
+
+  if (operation.type === "qr") {
+    return operation.size;
+  }
+
+  return estimateTextHeight(operation);
+}
+
+function parseZpl(zpl, renderContext) {
+  const tokens = tokenizeZpl(normalizeZpl(zpl));
+  const state = createInitialState();
+  const operations = [];
+  const warnings = [];
+
+  for (const token of tokens) {
+    const params = token.params;
+
+    switch (token.code) {
+      case "^XA":
+      case "^XZ":
+      case "^FS":
+      case "^CI":
+      case "^MC":
+        if (token.code === "^FS") {
+          state.block = null;
+          state.fieldHex = false;
+          state.barcode = null;
+        }
+        break;
+      case "^LH": {
+        const [x, y] = splitParams(params);
+        state.homeX = parseInteger(x);
+        state.homeY = parseInteger(y);
+        break;
+      }
+      case "^FO":
+      case "^FT": {
+        const [x, y] = splitParams(params);
+        state.x = state.homeX + parseInteger(x);
+        state.y = state.homeY + parseInteger(y);
+        break;
+      }
+      case "^A":
+        state.font = parseFont(params, state.font);
+        break;
+      case "^CF": {
+        const [name, height, width] = splitParams(params);
+        state.font = {
+          name: name || state.font.name,
+          orientation: "N",
+          height: parseInteger(height, state.font.height),
+          width: parseInteger(width, state.font.width),
+        };
+        break;
+      }
+      case "^FB": {
+        const [width, maxLines, lineSpacing, justification] = splitParams(params);
+        state.block = {
+          width: parseInteger(width, renderContext.sourceWidthDots - state.x),
+          maxLines: Math.max(1, parseInteger(maxLines, 1)),
+          lineSpacing: parseInteger(lineSpacing, 0),
+          justification: (justification || "L").toUpperCase(),
+        };
+        break;
+      }
+      case "^FH":
+        state.fieldHex = true;
+        break;
+      case "^BY": {
+        const [moduleWidth, ratio, height] = splitParams(params);
+        state.barcodeDefaults = {
+          moduleWidth: parseInteger(moduleWidth, state.barcodeDefaults.moduleWidth),
+          ratio: parseInteger(ratio, state.barcodeDefaults.ratio),
+          height: parseInteger(height, state.barcodeDefaults.height),
+        };
+        break;
+      }
+      case "^BQ": {
+        const [, model, magnification] = splitParams(params);
+        state.barcode = {
+          type: "qrcode",
+          model: parseInteger(model, 2),
+          magnification: parseInteger(magnification, 6),
+        };
+        break;
+      }
+      case "^FD": {
+        const data = decodeFieldData(params, state.fieldHex);
+
+        if (state.barcode && state.barcode.type === "qrcode") {
+          const qrText = data.replace(/^LA,/, "");
+          const size = Math.max(120, state.barcode.magnification * 38);
+          addOperation(operations, {
+            type: "qr",
+            x: state.x,
+            y: state.y,
+            text: qrText,
+            scale: state.barcode.magnification,
+            size,
+          });
+        } else {
+          addOperation(operations, {
+            type: "text",
+            x: state.x,
+            y: state.y,
+            text: data,
+            font: { ...state.font },
+            block: state.block ? { ...state.block } : null,
+          });
+        }
+
+        state.fieldHex = false;
+        state.block = null;
+        state.barcode = null;
+        break;
+      }
+      case "^GB": {
+        const [width, height, thickness] = splitParams(params);
+        addOperation(operations, {
+          type: "box",
+          x: state.x,
+          y: state.y,
+          width: parseInteger(width),
+          height: parseInteger(height),
+          thickness: Math.max(1, parseInteger(thickness, 1)),
+        });
+        break;
+      }
+      case "^GF": {
+        const graphicParams = params.startsWith("A,") ? params.slice(2) : params;
+        const graphic = parseGraphicField(graphicParams, warnings);
+        if (graphic) {
+          addOperation(operations, {
+            type: "graphic",
+            x: state.x,
+            y: state.y,
+            ...graphic,
+          });
+        }
+        break;
+      }
+      default:
+        if (/^[\^~]/.test(token.code)) {
+          warnings.push(`Unsupported command ignored: ${token.code}`);
+        }
+        break;
+    }
+  }
+
+  if (operations.length === 0) {
+    const error = new Error("Label contains no printable items");
+    error.statusCode = 422;
+    throw error;
+  }
+
+  return { operations, warnings };
+}
+
+function zplRepeatCount(char) {
+  const code = char.charCodeAt(0);
+  if (char >= "G" && char <= "Z") return code - 70;
+  if (char >= "g" && char <= "z") return (code - 102) * 20;
+  return 0;
+}
+
+function decodeGraphicRows(data, rowBytes) {
+  const rows = [];
+  let current = "";
+  let repeat = 0;
+  let previous = "0".repeat(rowBytes * 2);
+
+  const finishRow = () => {
+    const row = (current + "0".repeat(rowBytes * 2)).slice(0, rowBytes * 2);
+    rows.push(row);
+    previous = row;
+    current = "";
+    repeat = 0;
+  };
+
+  for (const char of data.replace(/\s/g, "")) {
+    if (char === ",") {
+      finishRow();
+      continue;
+    }
+
+    if (char === ":") {
+      rows.push(previous);
+      current = "";
+      repeat = 0;
+      continue;
+    }
+
+    if (char === "!") {
+      current += "F".repeat(Math.max(0, rowBytes * 2 - current.length));
+      continue;
+    }
+
+    const repeatValue = zplRepeatCount(char);
+    if (repeatValue > 0) {
+      repeat += repeatValue;
+      continue;
+    }
+
+    if (/^[0-9A-Fa-f]$/.test(char)) {
+      current += char.toUpperCase().repeat(repeat || 1);
+      repeat = 0;
+    }
+  }
+
+  if (current.length > 0) {
+    finishRow();
+  }
+
+  return rows;
+}
+
+function parseGraphicField(params, warnings) {
+  const parts = params.split(",");
+  const totalBytes = parseInteger(parts[0]);
+  const rowBytes = parseInteger(parts[2]);
+  const data = parts.slice(3).join(",");
+
+  if (!totalBytes || !rowBytes || !data) {
+    warnings.push("Invalid ^GFA graphic ignored");
+    return null;
+  }
+
+  const rows = decodeGraphicRows(data, rowBytes);
+
+  return {
+    rowBytes,
+    rows: rows.length,
+    hexRows: rows,
+  };
+}
+
+function inferCanvasHeight(operations, renderContext) {
+  const maxY = operations.reduce((highest, operation) => {
+    return Math.max(highest, operation.y + estimateGraphicHeight(operation));
+  }, 0);
+
+  return Math.max(renderContext.minHeightDots, Math.ceil((maxY + PAGE_PADDING_DOTS) * renderContext.scale));
+}
+
+function configureTextContext(ctx, font) {
+  const height = Math.max(8, font.height);
+  ctx.fillStyle = "#000000";
+  ctx.textBaseline = "top";
+  ctx.font = `${height}px "Arial Narrow", "Arial", sans-serif`;
+}
+
+function textScaleX(font, renderContext) {
+  const widthRatio = font.height > 0 ? font.width / font.height : 1;
+  return Math.max(0.35, widthRatio * renderContext.fontWidthScale);
+}
+
+function measureTextWidth(ctx, text, font, renderContext) {
+  return ctx.measureText(text).width * textScaleX(font, renderContext);
+}
+
+function wrapText(ctx, text, maxWidth, font, renderContext) {
+  const words = String(text).split(/\s+/);
+  const lines = [];
+  let current = "";
+
+  for (const word of words) {
+    const candidate = current ? `${current} ${word}` : word;
+    if (current && measureTextWidth(ctx, candidate, font, renderContext) > maxWidth) {
+      lines.push(current);
+      current = word;
+    } else {
+      current = candidate;
+    }
+  }
+
+  if (current) {
+    lines.push(current);
+  }
+
+  return lines.length > 0 ? lines : [String(text)];
+}
+
+function fillScaledText(ctx, text, x, y, font, renderContext) {
+  const scaleX = textScaleX(font, renderContext);
+
+  ctx.save();
+  ctx.translate(x, y);
+  ctx.scale(scaleX, 1);
+  ctx.fillText(text, 0, 0);
+  ctx.restore();
+}
+
+function drawText(ctx, operation, renderContext) {
+  configureTextContext(ctx, operation.font);
+
+  if (!operation.block) {
+    fillScaledText(ctx, operation.text, operation.x, operation.y, operation.font, renderContext);
+    return;
+  }
+
+  const lines = wrapText(ctx, operation.text, operation.block.width, operation.font, renderContext)
+    .slice(0, operation.block.maxLines);
+  const lineHeight = Math.max(1, operation.font.height + operation.block.lineSpacing);
+
+  lines.forEach((line, index) => {
+    let x = operation.x;
+    const width = measureTextWidth(ctx, line, operation.font, renderContext);
+
+    if (operation.block.justification === "C") {
+      x += Math.max(0, (operation.block.width - width) / 2);
+    } else if (operation.block.justification === "R") {
+      x += Math.max(0, operation.block.width - width);
+    }
+
+    fillScaledText(ctx, line, x, operation.y + (index * lineHeight), operation.font, renderContext);
+  });
+}
+
+function drawBox(ctx, operation) {
+  ctx.fillStyle = "#000000";
+
+  if (operation.width === 0 || operation.height === 0) {
+    ctx.fillRect(
+      operation.x,
+      operation.y,
+      Math.max(operation.width, operation.thickness),
+      Math.max(operation.height, operation.thickness)
+    );
+    return;
+  }
+
+  if (operation.width === operation.thickness && operation.height === operation.thickness) {
+    ctx.fillRect(operation.x, operation.y, operation.width, operation.height);
+    return;
+  }
+
+  ctx.lineWidth = operation.thickness;
+  ctx.strokeStyle = "#000000";
+  ctx.strokeRect(operation.x, operation.y, operation.width, operation.height);
+}
+
+function drawGraphic(ctx, operation) {
+  ctx.fillStyle = "#000000";
+
+  operation.hexRows.forEach((row, rowIndex) => {
+    for (let byteIndex = 0; byteIndex < operation.rowBytes; byteIndex += 1) {
+      const byte = Number.parseInt(row.slice(byteIndex * 2, (byteIndex * 2) + 2), 16);
+      if (!Number.isFinite(byte)) continue;
+
+      for (let bit = 0; bit < 8; bit += 1) {
+        if (byte & (0x80 >> bit)) {
+          ctx.fillRect(operation.x + (byteIndex * 8) + bit, operation.y + rowIndex, 1, 1);
+        }
+      }
+    }
+  });
+}
+
+async function loadBwip() {
+  if (!bwipPromise) {
+    bwipPromise = import("@bwip-js/browser");
+  }
+
+  return bwipPromise;
+}
+
+async function drawQr(ctx, operation) {
+  const bwip = await loadBwip();
+  const qrCanvas = createCanvas(operation.size, operation.size);
+
+  bwip.render({
+    bcid: "qrcode",
+    text: operation.text,
+    scale: Math.max(2, operation.scale),
+    backgroundcolor: "FFFFFF",
+  }, bwip.drawingCanvas(qrCanvas));
+
+  ctx.drawImage(qrCanvas, operation.x, operation.y, operation.size, operation.size);
+}
+
+async function renderZplToCanvas(zpl, options = {}) {
+  const renderContext = createRenderContext(options);
+  const { operations, warnings } = parseZpl(zpl, renderContext);
+  const canvas = createCanvas(renderContext.widthDots, inferCanvasHeight(operations, renderContext));
+  const ctx = canvas.getContext("2d");
+
+  ctx.fillStyle = "#FFFFFF";
+  ctx.fillRect(0, 0, canvas.width, canvas.height);
+  ctx.scale(renderContext.scale, renderContext.scale);
+
+  for (const operation of operations) {
+    if (operation.type === "text") {
+      drawText(ctx, operation, renderContext);
+    } else if (operation.type === "box") {
+      drawBox(ctx, operation);
+    } else if (operation.type === "graphic") {
+      drawGraphic(ctx, operation);
+    } else if (operation.type === "qr") {
+      await drawQr(ctx, operation);
+    }
+  }
+
+  return { canvas, warnings };
+}
+
+function canvasToPdfBuffer(canvas, renderOptions = {}) {
+  const renderContext = createRenderContext(renderOptions);
+  const labelHeightInches = canvas.height / renderContext.dpi;
+  const pdf = new jsPDF({
+    orientation: "portrait",
+    unit: "in",
+    format: [renderContext.width, labelHeightInches],
+    compress: true,
+  });
+
+  pdf.addImage(
+    canvas.toDataURL("image/png"),
+    "PNG",
+    0,
+    0,
+    renderContext.width,
+    labelHeightInches
+  );
+
+  return Buffer.from(pdf.output("arraybuffer"));
+}
+
+async function convertZplToPdf(zpl, options = {}) {
+  const renderOptions = normalizeRenderOptions(options);
+  const { canvas, warnings } = await renderZplToCanvas(zpl, renderOptions);
+
+  return {
+    buffer: canvasToPdfBuffer(canvas, renderOptions),
+    warnings,
+  };
+}
+
+function buildServer() {
+  const app = fastify({
+    logger: true,
+    bodyLimit: 5 * 1024 * 1024,
+  });
+
+  app.post("/convert", async (request, reply) => {
+    try {
+      const zpl = request.body && request.body.zpl;
+
+      if (typeof zpl !== "string" || zpl.trim() === "") {
+        return reply.code(400).send({
+          error: "Bad Request",
+          message: 'Body JSON must include a non-empty "zpl" string.',
+        });
+      }
+
+      const { buffer, warnings } = await convertZplToPdf(zpl, {
+        width: request.body.width,
+        height: request.body.height,
+        dpi: request.body.dpi,
+        sourceDpi: request.body.sourceDpi,
+        fontWidthScale: request.body.fontWidthScale,
+      });
+
+      if (warnings.length > 0) {
+        reply.header("X-ZPL-Parser-Warnings", String(warnings.length));
+      }
+
+      return reply
+        .code(200)
+        .header("Content-Type", "application/pdf")
+        .header("Content-Disposition", 'inline; filename="etiqueta.pdf"')
+        .send(buffer);
+    } catch (error) {
+      request.log.error({ err: error }, "ZPL to PDF conversion failed");
+
+      const statusCode = Number.isInteger(error.statusCode) ? error.statusCode : 500;
+      return reply.code(statusCode).send({
+        error: statusCode === 500 ? "Internal Server Error" : "Conversion Error",
+        message: error.message || "Unable to convert ZPL to PDF.",
+      });
+    }
+  });
+
+  return app;
+}
+
+async function start() {
+  const app = buildServer();
+
+  try {
+    await app.listen({ host: HOST, port: PORT });
+  } catch (error) {
+    app.log.error(error);
+    process.exit(1);
+  }
+}
+
+if (require.main === module) {
+  start();
+}
+
+module.exports = {
+  buildServer,
+  convertZplToPdf,
+};