Publish ITWorx Pulse source

internal/containerapi/handler.go

@@ -0,0 +1,85 @@
+package containerapi
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/itworx/pulse/internal/auth"
+	"github.com/itworx/pulse/internal/container"
+	"github.com/itworx/pulse/internal/problem"
+)
+
+type Handler struct {
+	Provider interface {
+		Snapshot(context.Context) (container.Snapshot, error)
+	}
+	Limits container.Limits
+}
+
+func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet || (r.URL.Path != "/api/v1/containers" && !strings.HasPrefix(r.URL.Path, "/api/v1/containers/")) {
+		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 containers.", 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, "CONTAINERS_UNAVAILABLE", "Containers not available", "Containergegevens konden niet worden gelezen.", nil)
+		return
+	}
+	if r.URL.Path != "/api/v1/containers" {
+		id := strings.TrimPrefix(r.URL.Path, "/api/v1/containers/")
+		for _, item := range snapshot.Containers {
+			if item.ID == id {
+				writeJSON(w, struct {
+					Source    container.Source    `json:"source"`
+					Container container.Container `json:"container"`
+				}{Source: snapshot.Source, Container: item})
+				return
+			}
+		}
+		http.NotFound(w, r)
+		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, "CONTAINER_QUERY_INVALID", "Invalid container query", "De containerlimiet is ongeldig.", nil)
+			return
+		}
+		limit = parsed
+	}
+	order := r.URL.Query().Get("sort")
+	if order == "" {
+		order = "name"
+	}
+	page, err := container.FilteredPage(snapshot, limit, r.URL.Query().Get("after"), h.Limits, r.URL.Query().Get("q"), r.URL.Query().Get("state"), r.URL.Query().Get("health"), order)
+	if err != nil {
+		problem.Write(w, r, http.StatusBadRequest, "CONTAINER_QUERY_INVALID", "Invalid container query", "De containerlimiet of cursor is ongeldig.", nil)
+		return
+	}
+	writeJSON(w, page)
+}
+func (h Handler) snapshot(r *http.Request) (container.Snapshot, error) {
+	if h.Provider == nil {
+		return container.UnknownSnapshot(time.Now().UTC(), "container", "agent", "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)
+}