From 1dd0d17ba59a6a0392a53462846b13efc18df914 Mon Sep 17 00:00:00 2001
From: Daan Sprenkels <daan@dsprenkels.com>
Date: Sun, 5 Apr 2020 18:14:02 +0200
Subject: [PATCH] Add copy-to-clipboard button to meta page

Fixes #42.
---
 assets/css/main.css                       |  8 +++++
 assets/js/copyclipboard.js                | 39 +++++++++++++++++++++++
 assets/templates/html/pasteMeta.html.tmpl |  7 ++++
 3 files changed, 54 insertions(+)
 create mode 100644 assets/js/copyclipboard.js

diff --git a/assets/css/main.css b/assets/css/main.css
index 54f9979..a8d8cf4 100644
--- a/assets/css/main.css
+++ b/assets/css/main.css
@@ -19,4 +19,12 @@ body {
 
 pre {
     padding-left: 4ex; /* approx 4 monospaced spaces */
+}
+
+.success {
+    color: #008000;
+}
+
+.fail {
+    color: #800000;
 }
\ No newline at end of file
diff --git a/assets/js/copyclipboard.js b/assets/js/copyclipboard.js
new file mode 100644
index 0000000..033c9f2
--- /dev/null
+++ b/assets/js/copyclipboard.js
@@ -0,0 +1,39 @@
+"use strict";
+
+const COPY_TO_CLIPBOARD_STATUS_ID = "copyToClipboardStatus";
+let copyToClipboardCtr = 0;
+
+function copyToClipboardSuccess() {
+    let statusElem = document.getElementById(COPY_TO_CLIPBOARD_STATUS_ID);
+    statusElem.innerText = "URL copied!";
+    statusElem.classList.remove("fail");
+    statusElem.classList.add("success");
+}
+
+function copyToClipboardFail(cause) {
+    let statusElem = document.getElementById(COPY_TO_CLIPBOARD_STATUS_ID);
+    if (!cause) cause = "unknown error";
+    statusElem.innerText = "copy failed: " + cause;
+    statusElem.classList.remove("success");
+    statusElem.classList.add("fail");
+}
+
+function copyToClipboard(url) {
+    let copyEventIdx = ++copyToClipboardCtr;
+
+    if (!window.navigator.clipboard) {
+        let msg = "could not access clipboard";
+        if (window.location.protocol !== "https:") {
+            msg += ": website not using HTTPS"
+        }
+        copyToClipboardFail(msg);
+        return;
+    }
+    window.navigator.clipboard.writeText(url).then(() => {
+        if (copyToClipboardCtr !== copyEventIdx) return;
+        copyToClipboardSuccess();
+    }, () => {
+        if (copyToClipboardCtr !== copyEventIdx) return;
+        copyToClipboardFail();
+    });
+}
diff --git a/assets/templates/html/pasteMeta.html.tmpl b/assets/templates/html/pasteMeta.html.tmpl
index e697c30..6037c1c 100644
--- a/assets/templates/html/pasteMeta.html.tmpl
+++ b/assets/templates/html/pasteMeta.html.tmpl
@@ -2,8 +2,15 @@
 '{{.Paste.Key}}{{.FileExt}}' metadata - rushlink
 {{end}}
 
+{{define "head-append"}}
+<script type="text/javascript" src="/js/copyclipboard.js" defer></script>
+{{end}}
+
 {{define "body"}}
 <pre>
+<button onclick="copyToClipboard('{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}')">Copy URL to clipboard</button> <span id="copyToClipboardStatus"></span>
+</pre>
+<pre>
 <a href="{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}">{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}</a>
 ---
 {{if and (ne .Paste.State.String "deleted") .CanDeleteBool}}