Matrix-Chatfenster (read-only) im Dashboard integrieren

.env.example

@@ -3,3 +3,9 @@ APP_PORT=8080
 # Beispiel fuer externe MariaDB im Netzwerk:
 # DB_DSN=farmcal:DEIN_PASSWORT@tcp(192.168.178.20:3306)/farmcal?parseTime=true
 DB_DSN=farmcal:CHANGE_ME@tcp(127.0.0.1:3306)/farmcal?parseTime=true
+
+# Optional: Matrix-Chat (read-only)
+# MATRIX_HOMESERVER_URL=https://matrix.example.com
+# MATRIX_ACCESS_TOKEN=YOUR_MATRIX_ACCESS_TOKEN
+# MATRIX_ROOM_ID=!abcdefg12345:example.com
+# MATRIX_LIMIT=25

README.md

@@ -34,6 +34,18 @@ APP_PORT=8080
 DB_DSN=farmcal:SEHR_SICHERES_PASSWORT@tcp(192.168.1.40:3306)/farmcal?parseTime=true
 ```
 
+Optional fuer Matrix-Chat (nur Anzeige):
+
+```env
+MATRIX_HOMESERVER_URL=https://matrix.example.com
+MATRIX_ACCESS_TOKEN=YOUR_MATRIX_ACCESS_TOKEN
+MATRIX_ROOM_ID=!abcdefg12345:example.com
+MATRIX_LIMIT=25
+```
+
+- `MATRIX_ACCESS_TOKEN` sollte ein User-Token mit Leserechten fuer den Raum sein.
+- Wenn Matrix-Variablen fehlen, bleibt das Feature deaktiviert.
+
 ## Start mit Docker Compose
 
 ```bash
@@ -95,3 +107,4 @@ git push -u origin main
 - Kalenderansicht fuer mehrere Monate
 - Mehrspieler-/Benutzerverwaltung
 - Import/Export fuer bestehende Tabellen
+- Matrix: Nachrichten aus FarmCal senden (write support)

cmd/server/handlers_pages.go

@@ -69,6 +69,16 @@ func (a *App) handleDashboard(w http.ResponseWriter, r *http.Request) {
 		Calendar:      buildCalendar(plans, crops, products, stepMap, customTasks, doneMap, (settings.CurrentCycle*12)+(settings.CurrentMonth-1), settings.CurrentDay, settings.DaysPerMonth, 14),
 		PlanningCount: len(plans),
 	}
+	if a.matrix != nil {
+		data.MatrixEnabled = true
+		data.MatrixRoomID = a.matrix.RoomID
+		msgs, err := a.matrix.FetchRecentMessages(r.Context())
+		if err != nil {
+			data.MatrixError = err.Error()
+		} else {
+			data.MatrixMessages = msgs
+		}
+	}
 	data.TodayGroups = groupTasksByField(data.TodayTasks)
 	a.renderTemplate(w, "templates/dashboard.html", data)
 }

cmd/server/main.go

@@ -18,7 +18,8 @@ var monthNames = []string{
 }
 
 type App struct {
-	db *sql.DB
+	db     *sql.DB
+	matrix *MatrixClient
 }
 
 func main() {
@@ -38,7 +39,10 @@ func main() {
 		log.Fatalf("schema setup failed: %v", err)
 	}
 
-	app := &App{db: db}
+	app := &App{
+		db:     db,
+		matrix: newMatrixClientFromEnv(),
+	}
 	mux := http.NewServeMux()
 
 	mux.HandleFunc("/", app.handleDashboard)

cmd/server/matrix.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type MatrixClient struct {
+	HomeserverURL string
+	AccessToken   string
+	RoomID        string
+	Limit         int
+	httpClient    *http.Client
+}
+
+func newMatrixClientFromEnv() *MatrixClient {
+	hs := strings.TrimRight(readEnv("MATRIX_HOMESERVER_URL", ""), "/")
+	token := readEnv("MATRIX_ACCESS_TOKEN", "")
+	roomID := readEnv("MATRIX_ROOM_ID", "")
+	if hs == "" || token == "" || roomID == "" {
+		return nil
+	}
+
+	limit := mustInt(readEnv("MATRIX_LIMIT", "25"), 25)
+	if limit < 1 {
+		limit = 1
+	}
+	if limit > 100 {
+		limit = 100
+	}
+
+	return &MatrixClient{
+		HomeserverURL: hs,
+		AccessToken:   token,
+		RoomID:        roomID,
+		Limit:         limit,
+		httpClient: &http.Client{
+			Timeout: 6 * time.Second,
+		},
+	}
+}
+
+func (m *MatrixClient) FetchRecentMessages(ctx context.Context) ([]MatrixMessage, error) {
+	filter := fmt.Sprintf(`{"room":{"rooms":["%s"],"timeline":{"limit":%d}}}`, m.RoomID, m.Limit)
+	endpoint := m.HomeserverURL + "/_matrix/client/v3/sync?timeout=0&filter=" + url.QueryEscape(filter)
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Authorization", "Bearer "+m.AccessToken)
+
+	resp, err := m.httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return nil, errors.New("matrix sync failed: " + strconv.Itoa(resp.StatusCode))
+	}
+
+	var syncResp struct {
+		Rooms struct {
+			Join map[string]struct {
+				Timeline struct {
+					Events []struct {
+						Type           string `json:"type"`
+						Sender         string `json:"sender"`
+						OriginServerTS int64  `json:"origin_server_ts"`
+						Content        struct {
+							MsgType string `json:"msgtype"`
+							Body    string `json:"body"`
+						} `json:"content"`
+					} `json:"events"`
+				} `json:"timeline"`
+			} `json:"join"`
+		} `json:"rooms"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&syncResp); err != nil {
+		return nil, err
+	}
+
+	room, ok := syncResp.Rooms.Join[m.RoomID]
+	if !ok {
+		return []MatrixMessage{}, nil
+	}
+
+	out := make([]MatrixMessage, 0, len(room.Timeline.Events))
+	for _, ev := range room.Timeline.Events {
+		if ev.Type != "m.room.message" {
+			continue
+		}
+		if ev.Content.MsgType != "m.text" && ev.Content.MsgType != "m.notice" {
+			continue
+		}
+		body := strings.TrimSpace(ev.Content.Body)
+		if body == "" {
+			continue
+		}
+		ts := time.UnixMilli(ev.OriginServerTS).Local().Format("02.01.2006 15:04")
+		out = append(out, MatrixMessage{
+			Sender:    ev.Sender,
+			Body:      body,
+			Timestamp: ts,
+		})
+	}
+	return out, nil
+}

cmd/server/types.go

@@ -149,6 +149,10 @@ type DashboardPage struct {
 	TodayGroups   []FieldTaskGroup
 	Calendar      []CalendarMonth
 	PlanningCount int
+	MatrixEnabled bool
+	MatrixRoomID  string
+	MatrixError   string
+	MatrixMessages []MatrixMessage
 }
 
 type FieldsPage struct {
@@ -181,3 +185,9 @@ type GeneralPage struct {
 	Settings Settings
 	Months   []MonthOption
 }
+
+type MatrixMessage struct {
+	Sender    string
+	Body      string
+	Timestamp string
+}

docker-compose.yml

@@ -9,3 +9,7 @@ services:
     environment:
       APP_ADDR: ":8080"
       DB_DSN: "${DB_DSN}"
+      MATRIX_HOMESERVER_URL: "${MATRIX_HOMESERVER_URL:-}"
+      MATRIX_ACCESS_TOKEN: "${MATRIX_ACCESS_TOKEN:-}"
+      MATRIX_ROOM_ID: "${MATRIX_ROOM_ID:-}"
+      MATRIX_LIMIT: "${MATRIX_LIMIT:-25}"

static/styles.css

@@ -250,6 +250,25 @@ button:hover { background: linear-gradient(180deg, #7cbc19, #5e8a12); }
 
 .month-days li { margin: .24rem 0; }
 
+.matrix-list {
+  list-style: none;
+  margin: .5rem 0 0;
+  padding: 0;
+  display: grid;
+  gap: .5rem;
+  max-height: 280px;
+  overflow: auto;
+}
+
+.matrix-list li {
+  border: 1px solid #d7decb;
+  border-radius: 9px;
+  background: #f9fdf2;
+  padding: .5rem .6rem;
+  display: grid;
+  gap: .2rem;
+}
+
 .table-wrap {
   overflow-x: auto;
   max-width: 100%;

templates/dashboard.html

@@ -83,6 +83,30 @@
       {{end}}
     </section>
 
+    <section class="card">
+      <h2>Matrix-Chat</h2>
+      {{if .MatrixEnabled}}
+        <p class="hint">Raum: <code>{{.MatrixRoomID}}</code></p>
+        {{if .MatrixError}}
+          <p class="muted">Chat konnte nicht geladen werden: {{.MatrixError}}</p>
+        {{else if .MatrixMessages}}
+          <ul class="matrix-list">
+            {{range .MatrixMessages}}
+            <li>
+              <div><strong>{{.Sender}}</strong></div>
+              <div>{{.Body}}</div>
+              <div class="muted">{{.Timestamp}}</div>
+            </li>
+            {{end}}
+          </ul>
+        {{else}}
+          <p class="muted">Keine Nachrichten gefunden.</p>
+        {{end}}
+      {{else}}
+        <p class="muted">Matrix-Chat ist nicht konfiguriert.</p>
+      {{end}}
+    </section>
+
     <section class="card full-width">
       <h2>Kalender ab jetzt (14 Monate)</h2>
       <div class="calendar-grid">