99 lines
4.6 KiB
HTML
99 lines
4.6 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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</head>
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<body>
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<button id="download">Download</button>
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<iframe id="iframe" sandbox="allow-scripts allow-downloads allow-downloads-without-user-activation"></iframe>
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<script type="text/javascript">
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const iframeHtml = `
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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</head>
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<body>
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<a id="link" href="#">Link to progamatically click</a>
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<script type="text/javascript">
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var link = document.getElementById("link");
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function downloadBlob(blob, filename) {
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var url = URL.createObjectURL(blob);
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link.href = url;
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link.download = filename;
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link.innerText = url;
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link.click();
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URL.revokeObjectURL(url);
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}
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function toBase64(buffer) {
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let binaryStr = "";
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const bytes = new Uint8Array(buffer);
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for (let i = 0; i < bytes.byteLength; i++) {
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binaryStr += String.fromCharCode(bytes[i]);
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}
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return window.btoa(binaryStr);
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}
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function downloadBuffer(buffer, mimeType, filename) {
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var url = "data:" + mimeType + ";base64," + toBase64(buffer);
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link.href = url;
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link.download = filename;
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link.innerText = url;
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link.click();
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}
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window.addEventListener("message", async function(event) {
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// if (event.origin === window.location.origin) {
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if (event.data.type === "downloadBuffer") {
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await downloadBuffer(event.data.buffer, event.data.mimeType, event.data.filename);
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} else if (event.data.type === "downloadBlob") {
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await downloadBlob(event.data.blob, event.data.filename);
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}
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// }
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});
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</${"script"}>
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</body>
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</html>`;
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const isIOS = /iPad|iPhone|iPod/.test(navigator.platform) || (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1) && !window.MSStream;
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const iframe = document.getElementById("iframe");
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const button = document.getElementById("download");
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iframe.setAttribute("srcdoc", iframeHtml);
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const blob = new Blob(["a message from the iframe"], {type: "text/plain"});
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window.addEventListener("message", async event => {
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//if (event.origin === window.location.origin) {
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//}
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});
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button.addEventListener("click", async evt => {
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if (isIOS) {
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const reader = new FileReader();
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const promise = new Promise((resolve, reject) => {
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reader.addEventListener("error", e => reject(e.error));
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reader.addEventListener("load", e => resolve(e.target.result));
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});
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reader.readAsArrayBuffer(blob);
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let buffer = await promise;
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iframe.contentWindow.postMessage({type: "downloadBuffer", mimeType: "text/plain", buffer, filename: "hello world.txt"}, "*");
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} else {
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iframe.contentWindow.postMessage({type: "downloadBlob", blob, filename: "hello world.txt"}, "*");
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}
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/*
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if (window.SharedArrayBuffer) {
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const srcView = new Uint8Array(buffer);
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const sharedBuffer = new SharedArrayBuffer(buffer.byteLength);
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const dstView = new Uint8Array(sharedBuffer);
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for (var i = srcView.length - 1; i >= 0; i--) {
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dstView[i] = srcView[i];
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}
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buffer = sharedBuffer;
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}
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*/
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//iframe.contentWindow.postMessage({type: "downloadBlob", blob, filename: "hello world.txt"}, "*");
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});
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</script>
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</body>
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</html>
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