From 8c2a3f12161f952161ca8cc10a6014c4a7ed3a39 Mon Sep 17 00:00:00 2001
From: Tatiana Lopaeva <tatiana.lopaeva@onlyoffice.com>
Date: Thu, 7 Dec 2023 17:10:20 +0300
Subject: [PATCH] Created watermark component.

---
 .../common/components/Watermarks/index.js     | 117 ++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 packages/common/components/Watermarks/index.js

diff --git a/packages/common/components/Watermarks/index.js b/packages/common/components/Watermarks/index.js
new file mode 100644
index 0000000000..9007ebfeb2
--- /dev/null
+++ b/packages/common/components/Watermarks/index.js
@@ -0,0 +1,117 @@
+import { useEffect } from "react";
+
+const Watermark = ({
+  text,
+  rotate,
+  image,
+  color,
+
+  isSemitransparent,
+
+  children,
+}) => {
+  const setCtxText = (ctx) => {
+    const getColor = () => {
+      if (color)
+        return Array.isArray(color)
+          ? `rgb(${color[0]}, ${color[1]}, ${color[2]}, 1)`
+          : color;
+
+      if (isSemitransparent) return "rgba(223, 226, 227, 1)";
+
+      return "rgba(208, 213, 218, 1)";
+    };
+
+    ctx.fillStyle = getColor();
+    ctx.textAlign = "center";
+    ctx.font = `${13}px Arial`;
+  };
+
+  const setCtxCenteredText = (imgContent, ctx) => {
+    ctx.translate(imgContent.width / 2, imgContent.height / 2);
+  };
+
+  const setCtxRotate = (ctx) => {
+    const angle = (Math.PI / 180) * Number(rotate);
+    ctx.rotate(angle);
+  };
+
+  const setCtxTextWrap = (ctx, canvas) => {
+    let line = "",
+      marginTop = 0,
+      marginLeft = 0,
+      lineHeight = 15;
+
+    for (var n = 0; n < text.length; n++) {
+      let testLine = line + text[n];
+      let testWidth = ctx.measureText(testLine).width;
+
+      const percentWidth = ((canvas.width - testWidth) * 100) / canvas.width;
+
+      if (
+        (percentWidth < 32 && text[n] === " ") ||
+        testWidth > canvas.width - 4
+      ) {
+        ctx.fillText(line, marginLeft, marginTop);
+        line = text[n];
+        marginTop += lineHeight;
+      } else {
+        line = testLine;
+      }
+    }
+
+    ctx.fillText(line, marginLeft, marginTop);
+  };
+
+  const getContent = (canvas, ctx, imgContent, imgWidth, imgHeight) => {
+    setCtxText(ctx);
+
+    ctx.drawImage(imgContent, 0, 0, imgWidth, imgHeight);
+
+    setCtxCenteredText(imgContent, ctx);
+    setCtxRotate(ctx);
+    setCtxTextWrap(ctx, canvas);
+  };
+
+  const drawCanvas = (drawContent, ctx, canvas) => {
+    canvas.width = drawContent.naturalWidth;
+    canvas.height = drawContent.naturalHeight;
+
+    getContent(
+      canvas,
+      ctx,
+      drawContent || "",
+      drawContent.naturalWidth,
+      drawContent.naturalHeight
+    );
+  };
+
+  const renderWatermark = () => {
+    const canvas = document.querySelector("canvas");
+    const ctx = canvas.getContext("2d");
+
+    const img = new Image();
+
+    img.onload = () => {
+      drawCanvas(img, ctx, canvas);
+    };
+    img.onerror = () => {
+      drawCanvas(text);
+    };
+    img.crossOrigin = "anonymous";
+    img.referrerPolicy = "no-referrer";
+
+    img.src = image;
+  };
+
+  useEffect(() => {
+    renderWatermark();
+  }, [text, rotate, isSemitransparent]);
+
+  return (
+    <canvas>
+      <div>{children}</div>
+    </canvas>
+  );
+};
+export default Watermark;