Publish ITWorx Pulse source

internal/backupapi/handler.go

@@ -0,0 +1,98 @@
+package backupapi
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"time"
+
+	"github.com/itworx/pulse/internal/auth"
+	"github.com/itworx/pulse/internal/backup"
+)
+
+type Handler struct {
+	Manager *backup.Manager
+	Audit   func(context.Context, string, string) error
+	// OnCreated invalidates derived status caches after the archive and its
+	// checksum have both been written successfully.
+	OnCreated func()
+}
+
+type publicResult struct {
+	BackupID string    `json:"backupId"`
+	SHA256   string    `json:"sha256"`
+	Bytes    int64     `json:"bytes"`
+	Rows     int64     `json:"rows"`
+	Created  time.Time `json:"createdAt"`
+}
+
+func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if h.Manager == nil {
+		writeError(w, http.StatusServiceUnavailable, "BACKUP_UNAVAILABLE", "Backup is not configured")
+		return
+	}
+	switch r.Method {
+	case http.MethodGet:
+		if r.URL.Path != "/api/v1/system/backups" {
+			writeError(w, http.StatusNotFound, "NOT_FOUND", "Not found")
+			return
+		}
+		result, err := h.Manager.List(r.Context())
+		if err != nil {
+			writeError(w, http.StatusServiceUnavailable, "BACKUP_UNAVAILABLE", "Backups are not available")
+			return
+		}
+		public := make([]publicResult, 0, len(result))
+		for _, item := range result {
+			public = append(public, toPublic(item))
+		}
+		writeJSON(w, http.StatusOK, map[string]any{"backups": public})
+	case http.MethodPost:
+		if r.URL.Path != "/api/v1/system/backups" {
+			writeError(w, http.StatusNotFound, "NOT_FOUND", "Not found")
+			return
+		}
+		result, err := h.Manager.Create(r.Context())
+		principal, _ := auth.PrincipalFromContext(r.Context())
+		if err != nil {
+			if h.Audit != nil {
+				_ = h.Audit(r.Context(), principal.Subject, "failure")
+			}
+			status := http.StatusInternalServerError
+			code := "BACKUP_FAILED"
+			if errors.Is(err, backup.ErrNotConfigured) {
+				status = http.StatusServiceUnavailable
+				code = "BACKUP_UNAVAILABLE"
+			}
+			writeError(w, status, code, "Backup could not be created")
+			return
+		}
+		if h.Audit != nil {
+			_ = h.Audit(r.Context(), principal.Subject, "success")
+		}
+		if h.OnCreated != nil {
+			h.OnCreated()
+		}
+		writeJSON(w, http.StatusCreated, toPublic(result))
+	default:
+		writeError(w, http.StatusMethodNotAllowed, "METHOD_NOT_ALLOWED", "Method not allowed")
+	}
+}
+
+func toPublic(result backup.Result) publicResult {
+	return publicResult{BackupID: result.BackupID, SHA256: result.SHA256, Bytes: result.Bytes, Rows: result.Rows, Created: result.Created}
+}
+
+func writeJSON(w http.ResponseWriter, status int, value any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.Header().Set("Cache-Control", "private, no-store")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(value)
+}
+
+func writeError(w http.ResponseWriter, status int, code, detail string) {
+	writeJSON(w, status, map[string]string{"code": code, "detail": detail})
+}
+
+var _ http.Handler = Handler{}