feat: init

README.md

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+# ePDF Downloader
+
+ePDF Downloader is a simple Chrome extension that adds a floating download button to webpages containing links containing `/doi/reader/` or `/doi/epdf/`.
+
+![screenshot](image.png)
+
+## Installation
+1. Download the extension ZIP file from the GitHub repository.
+2. Unzip the downloaded file.
+3. Open Google Chrome and go to [chrome://extensions/](chrome://extensions/).
+4. Turn on "Developer mode" (top right corner).
+5. Click "Load unpacked" and select the unzipped folder.
+6. ePDF Downloader will be added to your Chrome browser.
+
+## Usage
+1. Visit a webpage that has paper links with either `/doi/reader/` or `doi/epdf/`.
+2. Look for the floating download button in the bottom right corner.
+3. If a DOI link with the specified pattern is detected, the button will appear.
+4. Click the button to open a new tab and download the PDF.
+
+## Uninstalling
+1. Go to [chrome://extensions/](chrome://extensions/).
+2. Find "ePDF Downloader" in the list.
+3. Click "Remove" to uninstall the extension.
+
+## Contributing
+Contributions are welcome! Feel free to open an issue or create a pull request on GitHub.
+
+## License
+ePDF Downloader is licensed under the MIT License.
+
+Thank you for using ePDF Downloader! If you have any questions or need support, please let us know in the Issues section. Enjoy easy PDF downloads!

content.js

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+scanHTMLForDOIUrls();
+
+function scanHTMLForDOIUrls() {
+  const docLinks = document.links;
+  for (let i = 0; i < docLinks.length; i++) {
+    const link = docLinks[i].href;
+    if (link.includes("/doi/reader/") || link.includes("/doi/epdf/")) {
+      addDownloadButton(link);
+    }
+  }
+}
+
+function addDownloadButton(url) {
+  const newUrl = getUpdatedURL(url);
+  if (newUrl) {
+    const button = document.createElement("button");
+    button.style.position = "fixed";
+    button.style.bottom = "20px";
+    button.style.right = "20px";
+    button.style.backgroundColor = "transparent";
+    button.style.border = "none";
+    button.style.zIndex = "9999";
+
+    const iconImage = new Image();
+    iconImage.src = chrome.runtime.getURL('pdf.svg');
+    iconImage.style.width = "auto";
+    iconImage.style.height = "60px";
+    iconImage.style.objectFit = "contain";
+
+    button.appendChild(iconImage);
+
+    button.addEventListener("click", function () {
+      window.open(newUrl, "_blank");
+    });
+
+    document.body.appendChild(button);
+  }
+}
+
+function getUpdatedURL(url) {
+  if (url.includes("/doi/reader/")) {
+    return url.replace("/doi/reader/", "/doi/pdf/");
+  } else if (url.includes("/doi/epdf/")) {
+    return url.replace("/doi/epdf/", "/doi/pdf/");
+  }
+  return null;
+}

manifest.json

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+{
+  "manifest_version": 3,
+  "name": "ePDF Downloader",
+  "version": "1.0",
+  "description": "A Chrome extension to download PDF from ePDF links",
+  "permissions": ["activeTab"],
+  "content_scripts": [
+    {
+      "matches": ["https://*/*", "http://*/*"],
+      "js": ["content.js"]
+    }
+  ],
+  "web_accessible_resources": [
+    {
+      "resources": ["pdf.svg"],
+      "matches": ["https://*/*", "http://*/*"]
+    }
+  ],
+  "icons": {
+    "48": "download-icon.png"
+  }
+}