Add chat page, though it's not used yet

srv/src/http/tpl/chat.html

@@ -0,0 +1,251 @@
+{{ define "body" }}
+
+<script async type="module" src="/assets/api.js"></script>
+
+<style>
+    #messages {
+        max-height: 65vh;
+        overflow: auto;
+        padding-right: 2rem;
+    }
+
+    #messages .message {
+        border: 1px solid #AAA;
+        border-radius: 10px;
+        margin-bottom: 1rem;
+        padding: 2rem;
+        overflow: auto;
+    }
+
+    #messages .message .title {
+        font-weight: bold;
+        font-size: 120%;
+    }
+
+    #messages .message .secondaryTitle {
+        font-family: monospace;
+        color: #CCC;
+    }
+
+    #messages .message p {
+        font-family: monospace;
+        margin: 1rem 0 0 0;
+    }
+
+</style>
+
+<div id="messages"></div>
+
+<span id="fail" style="color: red;"></span>
+
+<script>
+
+const messagesEl = document.getElementById("messages");
+
+let messagesScrolledToBottom = true;
+messagesEl.onscroll = () => {
+    const el = messagesEl;
+    messagesScrolledToBottom = el.scrollHeight == el.scrollTop + el.clientHeight;
+};
+
+function renderMessages(msgs) {
+
+    messagesEl.innerHTML = '';
+
+    msgs.forEach((msg) => {
+        const el = document.createElement("div");
+        el.className = "row message"
+
+        const elWithTextContents = (tag, body) => {
+            const el = document.createElement(tag);
+            el.appendChild(document.createTextNode(body));
+            return el;
+        };
+
+        const titleEl = document.createElement("div");
+        titleEl.className = "title";
+        el.appendChild(titleEl);
+
+        const userNameEl = elWithTextContents("span", msg.userID.name);
+        titleEl.appendChild(userNameEl);
+
+        const secondaryTitleEl = document.createElement("div");
+        secondaryTitleEl.className = "secondaryTitle";
+        el.appendChild(secondaryTitleEl);
+
+        const dt = new Date(msg.createdAt*1000);
+        const dtStr
+            = `${dt.getFullYear()}-${dt.getMonth()+1}-${dt.getDate()}`
+            + ` ${dt.getHours()}:${dt.getMinutes()}:${dt.getSeconds()}`;
+
+        const userIDEl = elWithTextContents("span", `userID:${msg.userID.id} @ ${dtStr}`);
+        secondaryTitleEl.appendChild(userIDEl);
+
+        const bodyEl = document.createElement("p");
+
+        const bodyParts = msg.body.split("\n");
+        for (const i in bodyParts) {
+            if (i > 0) bodyEl.appendChild(document.createElement("br"));
+            bodyEl.appendChild(document.createTextNode(bodyParts[i]));
+        }
+
+        el.appendChild(bodyEl);
+
+        messagesEl.appendChild(el);
+    });
+}
+
+
+(async () => {
+
+    const failEl = document.getElementById("fail");
+    setErr = (msg) => failEl.innerHTML = `${msg} (please refresh the page to retry)`;
+
+    try {
+
+        const api = await import("/assets/api.js");
+
+        const history = await api.call("/api/chat/global/history");
+        const msgs = history.messages;
+
+        // history returns msgs in time descending, but we display them in time
+        // ascending.
+        msgs.reverse()
+
+        const sinceID = (msgs.length > 0) ?  msgs[msgs.length-1].id : "";
+
+        const ws = await api.ws("/api/chat/global/listen", {
+            params: { sinceID },
+        });
+
+        while (true) {
+            renderMessages(msgs);
+
+            // If the user was previously scrolled to the bottom then keep them
+            // there.
+            if (messagesScrolledToBottom) {
+                messagesEl.scrollTop = messagesEl.scrollHeight;
+            }
+
+            const msg = await ws.next();
+            msgs.push(msg.message);
+            renderMessages(msgs);
+        }
+
+
+    } catch (e) {
+        e = `Failed to fetch message history: ${e}`
+        setErr(e);
+        console.error(e);
+        return;
+    }
+
+})()
+
+</script>
+
+<style>
+#append {
+    border: 1px dashed #AAA;
+    border-radius: 10px;
+    padding: 2rem;
+}
+
+#append #appendBody {
+    font-family: monospace;
+}
+
+#append #appendStatus {
+    color: red;
+}
+
+</style>
+
+<form id="append">
+    <h5>New Message</h5>
+    <div class="row">
+        <div class="columns four">
+            <input class="u-full-width" placeholder="Name" id="appendName" type="text" />
+            <input class="u-full-width" placeholder="Secret" id="appendSecret" type="password" />
+        </div>
+        <div class="columns eight">
+            <p>
+                Your name is displayed alongside your message.
+
+                Your name+secret is used to generate your userID, which is also
+                displayed alongside your message.
+
+                Other users can validate two messages are from the same person
+                by comparing the messages' userID.
+            </p>
+        </div>
+    </div>
+    <div class="row">
+        <div class="columns twelve">
+            <textarea
+                style="font-family: monospace"
+                id="appendBody"
+                class="u-full-width"
+                placeholder="Well thought out statement goes here..."
+                ></textarea>
+        </div>
+    </div>
+    <div class="row">
+        <div class="columns four">
+            <input class="u-full-width button-primary" id="appendSubmit" type="button" value="Submit" />
+        </div>
+    </div>
+    <span id="appendStatus"></span>
+</form>
+
+<script>
+
+const append = document.getElementById("append");
+const appendName = document.getElementById("appendName");
+const appendSecret = document.getElementById("appendSecret");
+const appendBody = document.getElementById("appendBody");
+const appendSubmit = document.getElementById("appendSubmit");
+const appendStatus = document.getElementById("appendStatus");
+
+appendSubmit.onclick = async () => {
+
+    const appendSubmitOrigValue = appendSubmit.value;
+
+    appendSubmit.disabled = true;
+    appendSubmit.className = "";
+    appendSubmit.value = "Please hold...";
+
+    appendStatus.innerHTML = '';
+
+    try {
+
+        const api = await import("/assets/api.js");
+
+        await api.call('/api/chat/global/append', {
+            body: {
+                name: appendName.value,
+                password: appendSecret.value,
+                body: appendBody.value,
+            },
+            requiresPow: true,
+        });
+
+        appendBody.value = '';
+
+    } catch (e) {
+
+        appendStatus.innerHTML = e;
+
+    } finally {
+        appendSubmit.disabled = false;
+        appendSubmit.className = "button-primary";
+        appendSubmit.value = appendSubmitOrigValue;
+    }
+};
+
+</script>
+
+{{ end }}
+
+{{ template "base.html" . }}
+