feat(windows): add recoverable existing-agent credential upgrade

backend/app/frontend/static/agent-management.js

@@ -27,6 +27,8 @@
         "agentCreateSubmit",
         "agentCreateStatus",
         "agentEnrollmentResult",
+        "agentEnrollmentResultTitle",
+        "agentEnrollmentResultCopy",
         "agentEnrollmentToken",
         "agentEnrollmentExpires",
         "agentEnrollmentDownload",
@@ -48,6 +50,8 @@
     };
 
     let enrollments = [];
+    let packageEndpoint = "/api/agent-enrollments/windows-package";
+    let packageFilename = "MinerOpsAgent-Windows.zip";
 
     function text(value, fallback) {
         if (value === null || value === undefined || value === "") {
@@ -143,6 +147,27 @@
                 cell(words(agent.routing_state))
             );
 
+            const action = document.createElement("td");
+            const canManage =
+                el.agentManagementContent.dataset.canManageAgents === "true";
+            if (
+                canManage &&
+                agent.credential_state === "legacy" &&
+                agent.routing_state === "assigned"
+            ) {
+                const button = document.createElement("button");
+                button.type = "button";
+                button.className = "quiet-button";
+                button.textContent = "Upgrade credential";
+                button.addEventListener("click", function () {
+                    createCredentialTransition(agent);
+                });
+                action.appendChild(button);
+            } else {
+                action.textContent = "—";
+            }
+            row.appendChild(action);
+
             el.agentRows.appendChild(row);
         });
 
@@ -188,7 +213,10 @@
                 cell(words(enrollment.status)),
                 cell(dateTime(enrollment.created_at)),
                 cell(dateTime(enrollment.expires_at)),
-                cell(text(enrollment.enrolled_agent_id, "Not enrolled"))
+                cell(text(
+                    enrollment.enrolled_agent_id || enrollment.target_agent_id,
+                    "Not enrolled"
+                ))
             );
 
             el.agentEnrollmentRows.appendChild(row);
@@ -338,15 +366,15 @@
             });
 
             const enrollment = payload.data;
-
-            el.agentEnrollmentToken.textContent =
-                enrollment.enrollment_token;
-
-            el.agentEnrollmentExpires.textContent =
-                "Expires " + dateTime(enrollment.expires_at);
-
-            el.agentEnrollmentCopyStatus.textContent = "";
-            el.agentEnrollmentResult.hidden = false;
+            showOneTimeToken({
+                token: enrollment.enrollment_token,
+                expiresAt: enrollment.expires_at,
+                title: "Enrollment created",
+                copy: "This token creates a new Agent identity. Keep it private. " +
+                    "MinerOps does not store the plaintext token.",
+                endpoint: "/api/agent-enrollments/windows-package",
+                filename: "MinerOpsAgent-Windows.zip"
+            });
             el.agentCreateStatus.textContent = "Enrollment created.";
 
             el.agentDisplayName.value = "";
@@ -360,6 +388,54 @@
         }
     }
 
+    function showOneTimeToken(options) {
+        el.agentEnrollmentToken.textContent = options.token;
+        el.agentEnrollmentExpires.textContent =
+            "Expires " + dateTime(options.expiresAt);
+        el.agentEnrollmentResultTitle.textContent = options.title;
+        el.agentEnrollmentResultCopy.textContent = options.copy;
+        el.agentEnrollmentCopyStatus.textContent = "";
+        el.agentEnrollmentResult.hidden = false;
+        packageEndpoint = options.endpoint;
+        packageFilename = options.filename;
+    }
+
+    async function createCredentialTransition(agent) {
+        const confirmed = window.confirm(
+            "Create a one-time credential upgrade for " + agent.agent_id +
+            "? Its Agent identity, Site, and Zone will remain unchanged."
+        );
+        if (!confirmed) return;
+
+        try {
+            const payload = await api("/api/agent-credential-transitions", {
+                method: "POST",
+                headers: {
+                    "Accept": "application/json",
+                    "Content-Type": "application/json"
+                },
+                body: JSON.stringify({agent_id: agent.agent_id})
+            });
+            const transition = payload.data;
+            showOneTimeToken({
+                token: transition.transition_token,
+                expiresAt: transition.expires_at,
+                title: "Existing Agent credential upgrade created",
+                copy: "This token is bound to the existing Agent identity " +
+                    transition.target_agent_id + ". It cannot enroll a new " +
+                    "Agent or transfer its Zone.",
+                endpoint: "/api/agent-credential-transitions/windows-package",
+                filename: "MinerOpsAgent-Credential-Upgrade-Windows.zip"
+            });
+            el.agentCreateStatus.textContent =
+                "Credential upgrade created for " + transition.target_agent_id + ".";
+            await refreshData(false);
+        } catch (error) {
+            el.agentCreateStatus.textContent =
+                error.message || "Credential upgrade could not be created.";
+        }
+    }
+
     async function downloadWindowsPackage() {
         const token = el.agentEnrollmentToken.textContent;
 
@@ -375,7 +451,7 @@
 
         try {
             const response = await fetch(
-                "/api/agent-enrollments/windows-package",
+                packageEndpoint,
                 {
                     method: "POST",
                     credentials: "same-origin",
@@ -408,7 +484,7 @@
             const link = document.createElement("a");
 
             link.href = downloadUrl;
-            link.download = "MinerOpsAgent-Windows.zip";
+            link.download = packageFilename;
 
             document.body.appendChild(link);
             link.click();