terdut-server/internal/api/router.go

package api

import (
	"database/sql"
	"net/http"

	"git.ryuvia.com/niklas/terdut-server/internal/config"
	"git.ryuvia.com/niklas/terdut-server/internal/web"
	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
)

// NewRouter builds the HTTP surface. notify is passed through to the webhook,
// the only handler that has to decide where a new incident's page goes; a zero
// notify disables notifications. Dead man's switches are per team and read from
// the database, so nothing about them is wired in here.
func NewRouter(db *sql.DB, notify NotifyConfig, cfg config.Config) http.Handler {
	// One limiter each, both process-wide for the life of the router: login
	// counts failed passwords, sign-up counts account creation, and mixing the
	// two would let a burst of sign-ups lock somebody out of logging in.
	loginLimit := newLoginLimiter()
	signupLimiter := newLoginLimiter()

	r := chi.NewRouter()
	r.Use(middleware.Logger)
	r.Use(middleware.Recoverer)

	r.Get("/healthz", func(w http.ResponseWriter, r *http.Request) {
		respond(w, http.StatusOK, map[string]string{"status": "ok"})
	})

	// Unauthenticated: bootstrap, the Alertmanager webhook receiver, and the
	// Acknowledge button in a push notification. The last one is authorised by
	// the scoped token in its path rather than an API key, and has to stay
	// reachable from outside the cluster for the button to work.
	r.Post("/api/bootstrap", handleBootstrap(db))
	r.Post("/api/notify/ack/{token}", handleNotifyAck(db))

	// Alert ingestion. The key in the path says both that the sender may post
	// and which team the alerts belong to, which is why it needs no session.
	//
	// This is the only way in. The pre-teams /api/alertmanager/webhook, which
	// took no credential at all, was removed in v0.13.0 once the cluster's
	// Alertmanager had moved onto a key; a sender still posting there gets the
	// JSON 404 every unknown /api path gets.
	r.Post("/api/integrations/{key}/alertmanager", handleIntegrationWebhook(db, notify))

	// Signing up. Both are unauthenticated by necessity: the caller has no
	// account yet. The info endpoint says whether the door is open and whether
	// an invite link is good, so the form can say so before somebody picks a
	// password.
	r.Get("/api/signup", handleSignupInfo(db))
	r.Post("/api/signup", handleSignup(db, signupLimiter, notify.PublicURL))

	// Signing in to the web UI. Login trades a password for a session cookie,
	// which AuthMiddleware accepts in place of an API key.
	r.Post("/api/login", handleLogin(db, loginLimit, notify.PublicURL))
	r.Post("/api/logout", handleLogout(db, notify.PublicURL))

	// All other /api routes require a valid API key.
	r.Group(func(r chi.Router) {
		r.Use(AuthMiddleware(db))

		r.Get("/api/me", handleMe(db))

		// Readable by anyone signed in: the queue's assignment control and the
		// on-call schedule both need to name people.
		r.Get("/api/users", handleListUsers(db))

		// Your own account, or anybody's if you are an admin. The handlers call
		// requireSelfOrAdmin rather than sitting behind AdminOnly, because
		// which rule applies depends on the {id} in the path.
		r.Put("/api/users/{id}/notify", handleSetNotifyTarget(db))
		r.Put("/api/users/{id}/password", handleSetPassword(db))
		r.Post("/api/users/{id}/api-keys", handleCreateAPIKey(db))
		r.Delete("/api/users/{id}/api-keys/{keyID}", handleDeleteAPIKey(db))

		// Administration: who exists, and who is an administrator. Until #3
		// these were open to any authenticated caller, which meant every user
		// could delete every other one.
		r.Group(func(r chi.Router) {
			r.Use(AdminOnly)

			r.Post("/api/users", handleCreateUser(db))
			r.Delete("/api/users/{id}", handleDeleteUser(db))
			r.Put("/api/users/{id}/admin", handleSetAdmin(db))
			r.Put("/api/users/{id}/disabled", handleSetUserDisabled(db))

			// What exists on this server, and how it behaves. /api/teams
			// answers "what am I in"; this one answers "what is there".
			r.Get("/api/admin/teams", handleAdminListTeams(db))
			r.Get("/api/admin/settings", handleGetSettings(db, cfg))
			r.Put("/api/admin/settings", handleSetSettings(db))
		})

		// Alerts are read-only: they are Alertmanager's record, not a work
		// queue. Everything a person does happens on the incident instead.
		r.Get("/api/alerts", handleListAlerts(db))
		r.Get("/api/alerts/{id}", handleGetAlert(db))

		r.Get("/api/incidents", handleListIncidents(db))
		r.Get("/api/incidents/{id}", handleGetIncident(db))
		r.Get("/api/incidents/{id}/alerts", handleIncidentAlerts(db))
		r.Get("/api/incidents/{id}/timeline", handleIncidentTimeline(db))
		r.Post("/api/incidents/{id}/acknowledge", handleIncidentAcknowledge(db))
		r.Delete("/api/incidents/{id}/acknowledge", handleIncidentUnacknowledge(db))
		r.Post("/api/incidents/{id}/resolve", handleIncidentResolve(db))
		r.Post("/api/incidents/{id}/assign", handleIncidentAssign(db))
		r.Post("/api/incidents/{id}/snooze", handleIncidentSnooze(db))
		r.Delete("/api/incidents/{id}/snooze", handleIncidentUnsnooze(db))
		r.Post("/api/incidents/{id}/archive", handleIncidentArchive(db))
		r.Delete("/api/incidents/{id}/archive", handleIncidentUnarchive(db))
		r.Post("/api/incidents/{id}/notes", handleCreateNote(db))
		r.Delete("/api/incidents/{id}/notes/{eventID}", handleDeleteNote(db))

		// Teams. A user sees the teams they belong to; an owner configures one.
		r.Get("/api/teams", handleListTeams(db))
		r.Post("/api/teams", handleCreateTeam(db))
		r.Put("/api/teams/{teamID}", handleRenameTeam(db))
		r.Delete("/api/teams/{teamID}", handleDeleteTeam(db))
		r.Get("/api/teams/{teamID}/members", handleListTeamMembers(db))
		r.Post("/api/teams/{teamID}/members", handleAddTeamMember(db))
		r.Delete("/api/teams/{teamID}/members/{userID}", handleRemoveTeamMember(db))

		// Invite links into this team.
		r.Get("/api/teams/{teamID}/invites", handleListInvites(db))
		r.Post("/api/teams/{teamID}/invites", handleCreateInvite(db, notify.PublicURL))
		r.Delete("/api/teams/{teamID}/invites/{inviteID}", handleRevokeInvite(db))

		// A team's escalation ladder: who is paged when nobody answers.
		r.Get("/api/teams/{teamID}/escalation", handleGetEscalation(db))
		r.Put("/api/teams/{teamID}/escalation", handleSetEscalation(db))

		// A team's own dead man's switches: which of its alerts are heartbeats,
		// and how long a silence has to last before somebody is paged.
		r.Get("/api/teams/{teamID}/deadman", handleGetTeamDeadman(db))
		r.Put("/api/teams/{teamID}/deadman", handleSetTeamDeadman(db))

		// Integrations: where a team's alerts come in, and the key that says so.
		r.Get("/api/teams/{teamID}/integrations", handleListIntegrations(db))
		r.Post("/api/teams/{teamID}/integrations", handleCreateIntegration(db, notify.PublicURL))
		r.Delete("/api/teams/{teamID}/integrations/{integrationID}", handleDeleteIntegration(db))

		// The rota is per team. /api/schedule/current is the exception: it
		// answers across every team the caller is in, which is what somebody on
		// two rotas wants to see.
		r.Get("/api/schedule/current", handleCurrentSchedule(db))
		r.Post("/api/teams/{teamID}/schedule", handleCreateSchedule(db))
		r.Get("/api/teams/{teamID}/schedule", handleListSchedule(db))
		r.Delete("/api/teams/{teamID}/schedule/{id}", handleDeleteSchedule(db))

		r.Get("/api/stats/incidents", handleStatsIncidents(db))
		r.Get("/api/stats/alerts", handleStatsAlerts(db))
		r.Get("/api/stats/alerts/top", handleStatsTop(db))
		r.Get("/api/stats/alerts/by-hour", handleStatsByHour(db))
		r.Get("/api/stats/alerts/by-day", handleStatsByDay(db))
	})

	// Anything else under /api is a mistake in a client, and should say so in
	// JSON rather than get the web UI's HTML.
	r.Handle("/api/*", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		respond(w, http.StatusNotFound, errResp("not found"))
	}))

	// Everything outside /api is the web UI.
	site, err := web.Handler()
	if err != nil {
		panic(err) // the site is embedded at build time; this cannot fail at runtime
	}
	r.Handle("/*", site)

	return r
}