feat: add unauthenticated web dashboard showing monitoring state and recent alerts
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Add a read-only web dashboard at GET / that displays: - Summary counts for all monitored resources - Domain nameserver state with per-NS records and status - Hostname DNS records per authoritative nameserver - TCP port open/closed state with associated hostnames - TLS certificate details (CN, issuer, expiry, status) - Last 100 alerts in reverse chronological order Every data point shows relative age (e.g. '5m ago') for freshness. Page auto-refreshes every 30 seconds via meta refresh. Uses Tailwind CSS via CDN for a dark, technical aesthetic with saturated teals and blues on dark slate. Single page, no navigation. Implementation: - internal/notify/history.go: thread-safe ring buffer (last 100 alerts) - internal/notify/notify.go: record alerts in history before dispatch, refactor SendNotification into smaller dispatch helpers (funlen) - internal/handlers/dashboard.go: template rendering with embedded HTML, helper functions for relative time, record formatting, expiry days - internal/handlers/templates/dashboard.html: Tailwind-styled dashboard - internal/handlers/handlers.go: add State and Notify dependencies - internal/server/routes.go: register GET / dashboard route - README.md: document dashboard and new / endpoint No secrets (webhook URLs, API tokens, notification endpoints) are exposed in the dashboard. closes #82
This commit is contained in:
user
151
internal/handlers/dashboard.go
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151
internal/handlers/dashboard.go
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@@ -0,0 +1,151 @@
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package handlers
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import (
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"embed"
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"fmt"
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"html/template"
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"math"
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"net/http"
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"strings"
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"time"
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"sneak.berlin/go/dnswatcher/internal/notify"
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"sneak.berlin/go/dnswatcher/internal/state"
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)
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//go:embed templates/dashboard.html
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var dashboardFS embed.FS
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// Time unit constants for relative time calculations.
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const (
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secondsPerMinute = 60
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minutesPerHour = 60
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hoursPerDay = 24
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)
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// newDashboardTemplate parses the embedded dashboard HTML
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// template with helper functions.
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func newDashboardTemplate() *template.Template {
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funcs := template.FuncMap{
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"relTime": relTime,
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"joinStrings": joinStrings,
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"formatRecords": formatRecords,
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"expiryDays": expiryDays,
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}
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return template.Must(
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template.New("dashboard.html").
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Funcs(funcs).
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ParseFS(dashboardFS, "templates/dashboard.html"),
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)
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}
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// dashboardData is the data passed to the dashboard template.
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type dashboardData struct {
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Snapshot state.Snapshot
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Alerts []notify.AlertEntry
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StateAge string
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GeneratedAt string
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}
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// HandleDashboard returns the dashboard page handler.
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func (h *Handlers) HandleDashboard() http.HandlerFunc {
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tmpl := newDashboardTemplate()
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return func(
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writer http.ResponseWriter,
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_ *http.Request,
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) {
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snap := h.state.GetSnapshot()
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alerts := h.notifyHistory.Recent()
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data := dashboardData{
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Snapshot: snap,
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Alerts: alerts,
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StateAge: relTime(snap.LastUpdated),
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GeneratedAt: time.Now().UTC().Format("2006-01-02 15:04:05"),
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}
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writer.Header().Set(
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"Content-Type", "text/html; charset=utf-8",
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)
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err := tmpl.Execute(writer, data)
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if err != nil {
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h.log.Error(
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"dashboard template error",
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"error", err,
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)
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}
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}
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}
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// relTime returns a human-readable relative time string such
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// as "2 minutes ago" or "never" for zero times.
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func relTime(t time.Time) string {
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if t.IsZero() {
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return "never"
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}
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d := time.Since(t)
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if d < 0 {
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return "just now"
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}
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seconds := int(math.Round(d.Seconds()))
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if seconds < secondsPerMinute {
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return fmt.Sprintf("%ds ago", seconds)
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}
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minutes := seconds / secondsPerMinute
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if minutes < minutesPerHour {
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return fmt.Sprintf("%dm ago", minutes)
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}
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hours := minutes / minutesPerHour
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if hours < hoursPerDay {
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return fmt.Sprintf(
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"%dh %dm ago", hours, minutes%minutesPerHour,
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)
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}
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days := hours / hoursPerDay
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return fmt.Sprintf(
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"%dd %dh ago", days, hours%hoursPerDay,
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)
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}
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// joinStrings joins a string slice with a separator.
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func joinStrings(items []string, sep string) string {
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return strings.Join(items, sep)
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}
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// formatRecords formats a map of record type → values into a
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// compact display string.
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func formatRecords(records map[string][]string) string {
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if len(records) == 0 {
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return "-"
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}
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var parts []string
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for rtype, values := range records {
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for _, v := range values {
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parts = append(parts, rtype+": "+v)
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}
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}
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return strings.Join(parts, ", ")
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}
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// expiryDays returns the number of days until the given time,
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// rounded down. Returns 0 if already expired.
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func expiryDays(t time.Time) int {
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d := time.Until(t).Hours() / hoursPerDay
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if d < 0 {
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return 0
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}
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return int(d)
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}
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80
internal/handlers/dashboard_test.go
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80
internal/handlers/dashboard_test.go
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@@ -0,0 +1,80 @@
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package handlers_test
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import (
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"testing"
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"time"
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"sneak.berlin/go/dnswatcher/internal/handlers"
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)
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func TestRelTime(t *testing.T) {
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t.Parallel()
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tests := []struct {
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name string
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dur time.Duration
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want string
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}{
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{"zero", 0, "never"},
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{"seconds", 30 * time.Second, "30s ago"},
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{"minutes", 5 * time.Minute, "5m ago"},
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{"hours", 2*time.Hour + 15*time.Minute, "2h 15m ago"},
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{"days", 48*time.Hour + 3*time.Hour, "2d 3h ago"},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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t.Parallel()
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var input time.Time
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if tt.dur > 0 {
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input = time.Now().Add(-tt.dur)
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}
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got := handlers.RelTime(input)
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if got != tt.want {
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t.Errorf(
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"RelTime(%v) = %q, want %q",
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tt.dur, got, tt.want,
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)
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}
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})
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}
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}
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func TestExpiryDays(t *testing.T) {
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t.Parallel()
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// 10 days from now.
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future := time.Now().Add(10 * 24 * time.Hour)
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days := handlers.ExpiryDays(future)
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if days < 9 || days > 10 {
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t.Errorf("expected ~10 days, got %d", days)
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}
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// Already expired.
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past := time.Now().Add(-24 * time.Hour)
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days = handlers.ExpiryDays(past)
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if days != 0 {
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t.Errorf("expected 0 for expired, got %d", days)
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}
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}
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func TestFormatRecords(t *testing.T) {
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t.Parallel()
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got := handlers.FormatRecords(nil)
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if got != "-" {
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t.Errorf("expected -, got %q", got)
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}
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got = handlers.FormatRecords(map[string][]string{
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"A": {"1.2.3.4"},
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})
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if got != "A: 1.2.3.4" {
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t.Errorf("unexpected format: %q", got)
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}
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}
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18
internal/handlers/export_test.go
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18
internal/handlers/export_test.go
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@@ -0,0 +1,18 @@
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package handlers
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import "time"
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// RelTime exports relTime for testing.
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func RelTime(t time.Time) string {
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return relTime(t)
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}
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// ExpiryDays exports expiryDays for testing.
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func ExpiryDays(t time.Time) int {
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return expiryDays(t)
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}
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// FormatRecords exports formatRecords for testing.
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func FormatRecords(records map[string][]string) string {
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return formatRecords(records)
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}
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@@ -11,6 +11,8 @@ import (
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"sneak.berlin/go/dnswatcher/internal/globals"
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"sneak.berlin/go/dnswatcher/internal/healthcheck"
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"sneak.berlin/go/dnswatcher/internal/logger"
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"sneak.berlin/go/dnswatcher/internal/notify"
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"sneak.berlin/go/dnswatcher/internal/state"
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)
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// Params contains dependencies for Handlers.
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@@ -20,23 +22,29 @@ type Params struct {
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Logger *logger.Logger
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Globals *globals.Globals
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Healthcheck *healthcheck.Healthcheck
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State *state.State
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Notify *notify.Service
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}
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// Handlers provides HTTP request handlers.
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type Handlers struct {
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log *slog.Logger
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params *Params
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globals *globals.Globals
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hc *healthcheck.Healthcheck
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log *slog.Logger
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params *Params
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globals *globals.Globals
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hc *healthcheck.Healthcheck
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state *state.State
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notifyHistory *notify.AlertHistory
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}
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// New creates a new Handlers instance.
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func New(_ fx.Lifecycle, params Params) (*Handlers, error) {
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return &Handlers{
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log: params.Logger.Get(),
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params: ¶ms,
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globals: params.Globals,
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hc: params.Healthcheck,
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log: params.Logger.Get(),
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params: ¶ms,
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globals: params.Globals,
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hc: params.Healthcheck,
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state: params.State,
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notifyHistory: params.Notify.History(),
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}, nil
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}
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386
internal/handlers/templates/dashboard.html
Normal file
386
internal/handlers/templates/dashboard.html
Normal file
@@ -0,0 +1,386 @@
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<!doctype html>
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<html lang="en" class="bg-slate-950">
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<head>
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<meta charset="utf-8" />
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<meta http-equiv="refresh" content="30" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>dnswatcher</title>
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<script src="https://cdn.tailwindcss.com"></script>
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<script>
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tailwind.config = {
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theme: {
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extend: {
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colors: {
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surface: {
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950: "#0c1222",
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900: "#111827",
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800: "#1a2332",
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700: "#243044",
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},
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},
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},
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},
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};
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</script>
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</head>
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<body
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class="bg-surface-950 text-slate-300 font-mono text-sm min-h-screen antialiased"
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>
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<div class="max-w-6xl mx-auto px-4 py-8">
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{{/* ---- Header ---- */}}
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<div class="mb-8">
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<h1 class="text-2xl font-bold text-teal-400 tracking-tight">
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dnswatcher
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</h1>
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<p class="text-xs text-slate-500 mt-1">
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state updated {{ .StateAge }} · page generated
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{{ .GeneratedAt }} UTC · auto-refresh 30s
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</p>
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</div>
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{{/* ---- Summary bar ---- */}}
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<div
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class="grid grid-cols-2 sm:grid-cols-4 gap-3 mb-8"
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>
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<div class="bg-surface-800 border border-slate-700/50 rounded-lg p-4">
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<div class="text-xs text-slate-500 uppercase tracking-wider">
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Domains
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</div>
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<div class="text-2xl font-bold text-teal-400 mt-1">
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{{ len .Snapshot.Domains }}
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</div>
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</div>
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<div class="bg-surface-800 border border-slate-700/50 rounded-lg p-4">
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<div class="text-xs text-slate-500 uppercase tracking-wider">
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Hostnames
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</div>
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<div class="text-2xl font-bold text-teal-400 mt-1">
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{{ len .Snapshot.Hostnames }}
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</div>
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</div>
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<div class="bg-surface-800 border border-slate-700/50 rounded-lg p-4">
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<div class="text-xs text-slate-500 uppercase tracking-wider">
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Ports
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</div>
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<div class="text-2xl font-bold text-teal-400 mt-1">
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{{ len .Snapshot.Ports }}
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</div>
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</div>
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<div class="bg-surface-800 border border-slate-700/50 rounded-lg p-4">
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<div class="text-xs text-slate-500 uppercase tracking-wider">
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Certificates
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</div>
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<div class="text-2xl font-bold text-teal-400 mt-1">
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{{ len .Snapshot.Certificates }}
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</div>
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</div>
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</div>
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{{/* ---- Domains ---- */}}
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<section class="mb-8">
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<h2
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class="text-sm font-semibold text-teal-300 uppercase tracking-wider mb-3 border-b border-slate-700/50 pb-2"
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>
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Domains
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</h2>
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{{ if .Snapshot.Domains }}
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<div class="overflow-x-auto">
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<table class="w-full text-left text-xs">
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<thead>
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<tr class="text-slate-500 uppercase tracking-wider">
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<th class="py-2 px-3">Domain</th>
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<th class="py-2 px-3">Nameservers</th>
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<th class="py-2 px-3">Checked</th>
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</tr>
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</thead>
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<tbody class="divide-y divide-slate-800">
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{{ range $name, $ds := .Snapshot.Domains }}
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<tr class="hover:bg-surface-800/50">
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<td class="py-2 px-3 text-slate-200 font-medium">
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{{ $name }}
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</td>
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<td class="py-2 px-3 text-slate-400 break-all">
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{{ joinStrings $ds.Nameservers ", " }}
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</td>
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<td class="py-2 px-3 text-slate-500 whitespace-nowrap">
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{{ relTime $ds.LastChecked }}
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</td>
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</tr>
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{{ end }}
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</tbody>
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</table>
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</div>
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{{ else }}
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<p class="text-slate-600 italic text-xs">
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No domains configured.
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</p>
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{{ end }}
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</section>
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{{/* ---- Hostnames ---- */}}
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<section class="mb-8">
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<h2
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class="text-sm font-semibold text-teal-300 uppercase tracking-wider mb-3 border-b border-slate-700/50 pb-2"
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>
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Hostnames
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</h2>
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{{ if .Snapshot.Hostnames }}
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<div class="overflow-x-auto">
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<table class="w-full text-left text-xs">
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<thead>
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<tr class="text-slate-500 uppercase tracking-wider">
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<th class="py-2 px-3">Hostname</th>
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<th class="py-2 px-3">NS</th>
|
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<th class="py-2 px-3">Status</th>
|
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<th class="py-2 px-3">Records</th>
|
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<th class="py-2 px-3">Checked</th>
|
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</tr>
|
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</thead>
|
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<tbody class="divide-y divide-slate-800">
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{{ range $name, $hs := .Snapshot.Hostnames }}
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{{ range $ns, $nsr := $hs.RecordsByNameserver }}
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<tr class="hover:bg-surface-800/50">
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<td class="py-2 px-3 text-slate-200 font-medium">
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{{ $name }}
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</td>
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<td class="py-2 px-3 text-slate-400 break-all">
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{{ $ns }}
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</td>
|
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<td class="py-2 px-3">
|
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{{ if eq $nsr.Status "ok" }}
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<span
|
||||
class="inline-block px-1.5 py-0.5 rounded text-[10px] font-bold uppercase bg-teal-900/50 text-teal-400 border border-teal-700/30"
|
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>ok</span
|
||||
>
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{{ else }}
|
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<span
|
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class="inline-block px-1.5 py-0.5 rounded text-[10px] font-bold uppercase bg-red-900/50 text-red-400 border border-red-700/30"
|
||||
>{{ $nsr.Status }}</span
|
||||
>
|
||||
{{ end }}
|
||||
</td>
|
||||
<td
|
||||
class="py-2 px-3 text-slate-400 break-all max-w-xs"
|
||||
>
|
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{{ formatRecords $nsr.Records }}
|
||||
</td>
|
||||
<td class="py-2 px-3 text-slate-500 whitespace-nowrap">
|
||||
{{ relTime $nsr.LastChecked }}
|
||||
</td>
|
||||
</tr>
|
||||
{{ end }}
|
||||
{{ end }}
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
{{ else }}
|
||||
<p class="text-slate-600 italic text-xs">
|
||||
No hostnames configured.
|
||||
</p>
|
||||
{{ end }}
|
||||
</section>
|
||||
|
||||
{{/* ---- Ports ---- */}}
|
||||
<section class="mb-8">
|
||||
<h2
|
||||
class="text-sm font-semibold text-teal-300 uppercase tracking-wider mb-3 border-b border-slate-700/50 pb-2"
|
||||
>
|
||||
Ports
|
||||
</h2>
|
||||
{{ if .Snapshot.Ports }}
|
||||
<div class="overflow-x-auto">
|
||||
<table class="w-full text-left text-xs">
|
||||
<thead>
|
||||
<tr class="text-slate-500 uppercase tracking-wider">
|
||||
<th class="py-2 px-3">Address</th>
|
||||
<th class="py-2 px-3">State</th>
|
||||
<th class="py-2 px-3">Hostnames</th>
|
||||
<th class="py-2 px-3">Checked</th>
|
||||
</tr>
|
||||
</thead>
|
||||
<tbody class="divide-y divide-slate-800">
|
||||
{{ range $key, $ps := .Snapshot.Ports }}
|
||||
<tr class="hover:bg-surface-800/50">
|
||||
<td class="py-2 px-3 text-slate-200 font-medium">
|
||||
{{ $key }}
|
||||
</td>
|
||||
<td class="py-2 px-3">
|
||||
{{ if $ps.Open }}
|
||||
<span
|
||||
class="inline-block px-1.5 py-0.5 rounded text-[10px] font-bold uppercase bg-teal-900/50 text-teal-400 border border-teal-700/30"
|
||||
>open</span
|
||||
>
|
||||
{{ else }}
|
||||
<span
|
||||
class="inline-block px-1.5 py-0.5 rounded text-[10px] font-bold uppercase bg-red-900/50 text-red-400 border border-red-700/30"
|
||||
>closed</span
|
||||
>
|
||||
{{ end }}
|
||||
</td>
|
||||
<td class="py-2 px-3 text-slate-400 break-all">
|
||||
{{ joinStrings $ps.Hostnames ", " }}
|
||||
</td>
|
||||
<td class="py-2 px-3 text-slate-500 whitespace-nowrap">
|
||||
{{ relTime $ps.LastChecked }}
|
||||
</td>
|
||||
</tr>
|
||||
{{ end }}
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
{{ else }}
|
||||
<p class="text-slate-600 italic text-xs">
|
||||
No port data yet.
|
||||
</p>
|
||||
{{ end }}
|
||||
</section>
|
||||
|
||||
{{/* ---- Certificates ---- */}}
|
||||
<section class="mb-8">
|
||||
<h2
|
||||
class="text-sm font-semibold text-teal-300 uppercase tracking-wider mb-3 border-b border-slate-700/50 pb-2"
|
||||
>
|
||||
Certificates
|
||||
</h2>
|
||||
{{ if .Snapshot.Certificates }}
|
||||
<div class="overflow-x-auto">
|
||||
<table class="w-full text-left text-xs">
|
||||
<thead>
|
||||
<tr class="text-slate-500 uppercase tracking-wider">
|
||||
<th class="py-2 px-3">Endpoint</th>
|
||||
<th class="py-2 px-3">Status</th>
|
||||
<th class="py-2 px-3">CN</th>
|
||||
<th class="py-2 px-3">Issuer</th>
|
||||
<th class="py-2 px-3">Expires</th>
|
||||
<th class="py-2 px-3">Checked</th>
|
||||
</tr>
|
||||
</thead>
|
||||
<tbody class="divide-y divide-slate-800">
|
||||
{{ range $key, $cs := .Snapshot.Certificates }}
|
||||
<tr class="hover:bg-surface-800/50">
|
||||
<td class="py-2 px-3 text-slate-400 break-all">
|
||||
{{ $key }}
|
||||
</td>
|
||||
<td class="py-2 px-3">
|
||||
{{ if eq $cs.Status "ok" }}
|
||||
<span
|
||||
class="inline-block px-1.5 py-0.5 rounded text-[10px] font-bold uppercase bg-teal-900/50 text-teal-400 border border-teal-700/30"
|
||||
>ok</span
|
||||
>
|
||||
{{ else }}
|
||||
<span
|
||||
class="inline-block px-1.5 py-0.5 rounded text-[10px] font-bold uppercase bg-red-900/50 text-red-400 border border-red-700/30"
|
||||
>{{ $cs.Status }}</span
|
||||
>
|
||||
{{ end }}
|
||||
</td>
|
||||
<td class="py-2 px-3 text-slate-200">
|
||||
{{ $cs.CommonName }}
|
||||
</td>
|
||||
<td class="py-2 px-3 text-slate-400 break-all">
|
||||
{{ $cs.Issuer }}
|
||||
</td>
|
||||
<td class="py-2 px-3 whitespace-nowrap">
|
||||
{{ if not $cs.NotAfter.IsZero }}
|
||||
{{ $days := expiryDays $cs.NotAfter }}
|
||||
{{ if lt $days 7 }}
|
||||
<span class="text-red-400 font-medium"
|
||||
>{{ $cs.NotAfter.Format "2006-01-02" }}
|
||||
({{ $days }}d)</span
|
||||
>
|
||||
{{ else if lt $days 30 }}
|
||||
<span class="text-amber-400"
|
||||
>{{ $cs.NotAfter.Format "2006-01-02" }}
|
||||
({{ $days }}d)</span
|
||||
>
|
||||
{{ else }}
|
||||
<span class="text-slate-400"
|
||||
>{{ $cs.NotAfter.Format "2006-01-02" }}
|
||||
({{ $days }}d)</span
|
||||
>
|
||||
{{ end }}
|
||||
{{ end }}
|
||||
</td>
|
||||
<td class="py-2 px-3 text-slate-500 whitespace-nowrap">
|
||||
{{ relTime $cs.LastChecked }}
|
||||
</td>
|
||||
</tr>
|
||||
{{ end }}
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
{{ else }}
|
||||
<p class="text-slate-600 italic text-xs">
|
||||
No certificate data yet.
|
||||
</p>
|
||||
{{ end }}
|
||||
</section>
|
||||
|
||||
{{/* ---- Recent Alerts ---- */}}
|
||||
<section class="mb-8">
|
||||
<h2
|
||||
class="text-sm font-semibold text-teal-300 uppercase tracking-wider mb-3 border-b border-slate-700/50 pb-2"
|
||||
>
|
||||
Recent Alerts ({{ len .Alerts }})
|
||||
</h2>
|
||||
{{ if .Alerts }}
|
||||
<div class="space-y-2">
|
||||
{{ range .Alerts }}
|
||||
<div
|
||||
class="bg-surface-800 border rounded-lg px-4 py-3 {{ if eq .Priority "error" }}border-red-700/40{{ else if eq .Priority "warning" }}border-amber-700/40{{ else if eq .Priority "success" }}border-teal-700/40{{ else }}border-blue-700/40{{ end }}"
|
||||
>
|
||||
<div class="flex items-center gap-3 mb-1">
|
||||
{{ if eq .Priority "error" }}
|
||||
<span
|
||||
class="inline-block px-1.5 py-0.5 rounded text-[10px] font-bold uppercase bg-red-900/50 text-red-400 border border-red-700/30"
|
||||
>error</span
|
||||
>
|
||||
{{ else if eq .Priority "warning" }}
|
||||
<span
|
||||
class="inline-block px-1.5 py-0.5 rounded text-[10px] font-bold uppercase bg-amber-900/50 text-amber-400 border border-amber-700/30"
|
||||
>warning</span
|
||||
>
|
||||
{{ else if eq .Priority "success" }}
|
||||
<span
|
||||
class="inline-block px-1.5 py-0.5 rounded text-[10px] font-bold uppercase bg-teal-900/50 text-teal-400 border border-teal-700/30"
|
||||
>success</span
|
||||
>
|
||||
{{ else }}
|
||||
<span
|
||||
class="inline-block px-1.5 py-0.5 rounded text-[10px] font-bold uppercase bg-blue-900/50 text-blue-400 border border-blue-700/30"
|
||||
>info</span
|
||||
>
|
||||
{{ end }}
|
||||
<span class="text-slate-200 text-xs font-medium">
|
||||
{{ .Title }}
|
||||
</span>
|
||||
<span class="text-slate-600 text-[11px] ml-auto whitespace-nowrap">
|
||||
{{ .Timestamp.Format "2006-01-02 15:04:05" }} UTC
|
||||
({{ relTime .Timestamp }})
|
||||
</span>
|
||||
</div>
|
||||
<p
|
||||
class="text-slate-400 text-xs whitespace-pre-line pl-0.5"
|
||||
>
|
||||
{{ .Message }}
|
||||
</p>
|
||||
</div>
|
||||
{{ end }}
|
||||
</div>
|
||||
{{ else }}
|
||||
<p class="text-slate-600 italic text-xs">
|
||||
No alerts recorded since last restart.
|
||||
</p>
|
||||
{{ end }}
|
||||
</section>
|
||||
|
||||
{{/* ---- Footer ---- */}}
|
||||
<div
|
||||
class="text-[11px] text-slate-700 border-t border-slate-800 pt-4 mt-8"
|
||||
>
|
||||
dnswatcher · monitoring {{ len .Snapshot.Domains }} domains +
|
||||
{{ len .Snapshot.Hostnames }} hostnames
|
||||
</div>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user