Add copy-on-click and etherscan links to transaction detail page

From address, to address, and tx hash are now clickable to copy.
Each also has a small box-arrow icon linking to the corresponding
etherscan page. ENS names and full addresses are both copyable.

src/popup/views/addressDetail.js

@@ -182,27 +182,46 @@ function etherscanTxLink(hash) {
     return `https://etherscan.io/tx/${hash}`;
 }
 
+const EXT_ICON =
+    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
+    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
+    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
+    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
+    `</svg></span>`;
+
+function copyableHtml(text, extraClass) {
+    const cls =
+        "underline decoration-dashed cursor-pointer" +
+        (extraClass ? " " + extraClass : "");
+    return `<span class="${cls}" data-copy="${escapeHtml(text)}">${escapeHtml(text)}</span>`;
+}
+
 function txDetailAddressHtml(address) {
     const ensName = ensNameMap.get(address) || null;
     const dot = addressDotHtml(address);
     const link = etherscanAddressLink(address);
+    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
     if (ensName) {
         return (
             dot +
-            `<a href="${link}" target="_blank" class="underline decoration-dashed">${escapeHtml(ensName)}</a>` +
-            `<div class="break-all"><a href="${link}" target="_blank" class="underline decoration-dashed">${escapeHtml(address)}</a></div>`
+            copyableHtml(ensName, "") +
+            extLink +
+            `<div class="break-all">` +
+            copyableHtml(address, "break-all") +
+            `</div>`
         );
     }
-    return (
-        dot +
-        `<a href="${link}" target="_blank" class="underline decoration-dashed break-all">${escapeHtml(address)}</a>`
-    );
+    return dot + copyableHtml(address, "break-all") + extLink;
+}
+
+function txDetailHashHtml(hash) {
+    const link = etherscanTxLink(hash);
+    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
+    return copyableHtml(hash, "break-all") + extLink;
 }
 
 function showTxDetail(tx) {
-    const txLink = etherscanTxLink(tx.hash);
-    $("tx-detail-hash").innerHTML =
-        `<a href="${txLink}" target="_blank" class="underline decoration-dashed">${escapeHtml(tx.hash)}</a>`;
+    $("tx-detail-hash").innerHTML = txDetailHashHtml(tx.hash);
     $("tx-detail-from").innerHTML = txDetailAddressHtml(tx.from);
     $("tx-detail-to").innerHTML = txDetailAddressHtml(tx.to);
     $("tx-detail-value").textContent = tx.value + " " + tx.symbol;
@@ -210,6 +229,17 @@ function showTxDetail(tx) {
         isoDate(tx.timestamp) + " (" + timeAgo(tx.timestamp) + ")";
     $("tx-detail-status").textContent = tx.isError ? "Failed" : "Success";
     showView("transaction");
+
+    // Attach copy handlers
+    document
+        .getElementById("view-transaction")
+        .querySelectorAll("[data-copy]")
+        .forEach((el) => {
+            el.onclick = () => {
+                navigator.clipboard.writeText(el.dataset.copy);
+                showFlash("Copied!");
+            };
+        });
 }
 
 function init(ctx) {