Publish ITWorx Pulse source

internal/poolapi/handler.go

@@ -0,0 +1,87 @@
+package poolapi
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/itworx/pulse/internal/auth"
+	"github.com/itworx/pulse/internal/pool"
+	"github.com/itworx/pulse/internal/problem"
+)
+
+type Handler struct {
+	Provider    pool.Provider
+	MaxPageSize int
+}
+
+func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet || (r.URL.Path != "/api/v1/pools" && !strings.HasPrefix(r.URL.Path, "/api/v1/pools/")) {
+		http.NotFound(w, r)
+		return
+	}
+	if _, ok := auth.PrincipalFromContext(r.Context()); !ok {
+		problem.Write(w, r, http.StatusUnauthorized, "UNAUTHORIZED", "Authentication required", "Authentication is required to read pools.", nil)
+		return
+	}
+	if err := r.Context().Err(); err != nil {
+		return
+	}
+	snapshot, err := h.snapshot(r)
+	if err != nil {
+		if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
+			return
+		}
+		problem.Write(w, r, http.StatusServiceUnavailable, "POOLS_UNAVAILABLE", "Poolgegevens niet beschikbaar", "De poolgegevens konden niet worden gelezen.", nil)
+		return
+	}
+	if strings.HasPrefix(r.URL.Path, "/api/v1/pools/") {
+		id := strings.TrimPrefix(r.URL.Path, "/api/v1/pools/")
+		item, ok := pool.PoolByID(snapshot, id)
+		if !ok {
+			http.NotFound(w, r)
+			return
+		}
+		writeJSON(w, struct {
+			Source pool.Source `json:"source"`
+			Pool   pool.Pool   `json:"pool"`
+		}{snapshot.Source, item})
+		return
+	}
+	limit := 50
+	if value := r.URL.Query().Get("limit"); value != "" {
+		parsed, parseErr := strconv.Atoi(value)
+		if parseErr != nil {
+			problem.Write(w, r, http.StatusBadRequest, "POOL_QUERY_INVALID", "Invalid pool query", "De poollimiet is ongeldig.", nil)
+			return
+		}
+		limit = parsed
+	}
+	max := h.MaxPageSize
+	if max == 0 {
+		max = 100
+	}
+	if limit < 1 || limit > max {
+		problem.Write(w, r, http.StatusBadRequest, "POOL_QUERY_INVALID", "Invalid pool query", "De poollimiet is ongeldig.", nil)
+		return
+	}
+	if limit < len(snapshot.Pools) {
+		snapshot.Pools = snapshot.Pools[:limit]
+	}
+	writeJSON(w, snapshot)
+}
+func (h Handler) snapshot(r *http.Request) (pool.Snapshot, error) {
+	if h.Provider == nil {
+		return pool.UnknownSnapshot(time.Now().UTC(), "pools", "unraid", "source_unavailable"), nil
+	}
+	return h.Provider.Snapshot(r.Context())
+}
+func writeJSON(w http.ResponseWriter, value any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.Header().Set("Cache-Control", "private, max-age=5")
+	_ = json.NewEncoder(w).Encode(value)
+}