// skiacorrectness implements the process that exposes a RESTful API used by the JS frontend.
package main

import (
	"context"
	"flag"
	"fmt"
	"html/template"
	"io/ioutil"
	"math/rand"
	"net/http"
	netpprof "net/http/pprof"
	"os"
	"path/filepath"
	"runtime"
	"runtime/pprof"
	"strings"
	"time"

	"cloud.google.com/go/datastore"
	"github.com/gorilla/mux"
	"go.skia.org/infra/go/auth"
	"go.skia.org/infra/go/common"
	"go.skia.org/infra/go/ds"
	"go.skia.org/infra/go/eventbus"
	"go.skia.org/infra/go/fileutil"
	"go.skia.org/infra/go/firestore"
	"go.skia.org/infra/go/gerrit"
	"go.skia.org/infra/go/gevent"
	"go.skia.org/infra/go/git/gitinfo"
	"go.skia.org/infra/go/gitiles"
	"go.skia.org/infra/go/gitstore"
	"go.skia.org/infra/go/gitstore/bt_gitstore"
	"go.skia.org/infra/go/httputils"
	"go.skia.org/infra/go/issues"
	"go.skia.org/infra/go/login"
	"go.skia.org/infra/go/skiaversion"
	"go.skia.org/infra/go/sklog"
	"go.skia.org/infra/go/timer"
	tracedb "go.skia.org/infra/go/trace/db"
	"go.skia.org/infra/go/util"
	"go.skia.org/infra/go/vcsinfo"
	"go.skia.org/infra/go/vcsinfo/bt_vcs"
	"go.skia.org/infra/golden/go/baseline/gcs_baseliner"
	"go.skia.org/infra/golden/go/diff"
	"go.skia.org/infra/golden/go/diffstore"
	"go.skia.org/infra/golden/go/diffstore/mapper/disk_mapper"
	"go.skia.org/infra/golden/go/expstorage/fs_expstore"
	"go.skia.org/infra/golden/go/ignore"
	"go.skia.org/infra/golden/go/indexer"
	"go.skia.org/infra/golden/go/search"
	"go.skia.org/infra/golden/go/shared"
	"go.skia.org/infra/golden/go/status"
	"go.skia.org/infra/golden/go/storage"
	"go.skia.org/infra/golden/go/tryjobs/gerrit_tryjob_monitor"
	"go.skia.org/infra/golden/go/tryjobstore"
	"go.skia.org/infra/golden/go/types"
	"go.skia.org/infra/golden/go/warmer"
	"go.skia.org/infra/golden/go/web"
	"google.golang.org/api/option"
	gstorage "google.golang.org/api/storage/v1"
	"google.golang.org/grpc"
)

const (
	// IMAGE_URL_PREFIX is path prefix used for all images (digests and diffs)
	IMAGE_URL_PREFIX = "/img/"

	// OAUTH2_CALLBACK_PATH is callback endpoint used for the Oauth2 flow
	OAUTH2_CALLBACK_PATH = "/oauth2callback/"

	// WHITELIST_ALL can be provided as the value for the whitelist file to whitelist all configurations
	WHITELIST_ALL = "all"
)

func main() {
	// Command line flags.
	var (
		appTitle            = flag.String("app_title", "Skia Gold", "Title of the deployed up on the front end.")
		authoritative       = flag.Bool("authoritative", false, "Indicates that this instance should write changes that could be triggered on multiple instances running in parallel.")
		authorizedUsers     = flag.String("auth_users", login.DEFAULT_DOMAIN_WHITELIST, "White space separated list of domains and email addresses that are allowed to login.")
		baselineGSPath      = flag.String("baseline_gs_path", "", "GS path, where the baseline file should be stored. If empty no file will be written. Format: <bucket>/<path>.")
		cacheSize           = flag.Int("cache_size", 1, "Approximate cachesize used to cache images and diff metrics in GiB. This is just a way to limit caching. 0 means no caching at all. Use default for testing.")
		clientSecretFile    = flag.String("client_secret", "", "Client secret file for OAuth2 authentication.")
		cpuProfile          = flag.Duration("cpu_profile", 0, "Duration for which to profile the CPU usage. After this duration the program writes the CPU profile and exits.")
		defaultCorpus       = flag.String("default_corpus", "gm", "The corpus identifier shown by default on the frontend.")
		defaultMatchFields  = flag.String("match_fields", "name", "A comma separated list of fields that need to match when finding closest images.")
		diffServerGRPCAddr  = flag.String("diff_server_grpc", "", "The grpc port of the diff server. 'diff_server_http also needs to be set.")
		diffServerImageAddr = flag.String("diff_server_http", "", "The images serving address of the diff server. 'diff_server_grpc has to be set as well.")
		dsNamespace         = flag.String("ds_namespace", "", "Cloud datastore namespace to be used by this instance.")
		eventTopic          = flag.String("event_topic", "", "The pubsub topic to use for distributed events.")
		forceLogin          = flag.Bool("force_login", true, "Force the user to be authenticated for all requests.")
		fsNamespace         = flag.String("fs_namespace", "", "Typically the instance id. e.g. 'flutter', 'skia', etc")
		fsProjectID         = flag.String("fs_project_id", "skia-firestore", "The project with the firestore instance. Datastore and Firestore can't be in the same project.")
		fsLegacyAuth        = flag.Bool("fs_legacy_auth", false, "use legacy credentials to auth Firestore")
		gerritURL           = flag.String("gerrit_url", gerrit.GERRIT_SKIA_URL, "URL of the Gerrit instance where we retrieve CL metadata.")
		gitBTInstanceID     = flag.String("git_bt_instance", "", "ID of the BigTable instance that contains Git metadata")
		gitBTTableID        = flag.String("git_bt_table", "", "ID of the BigTable table that contains Git metadata")
		gitRepoDir          = flag.String("git_repo_dir", "../../../skia", "Directory location for the Skia repo.")
		gitRepoURL          = flag.String("git_repo_url", "https://skia.googlesource.com/skia", "The URL to pass to git clone for the source repository.")
		gsBucketNames       = flag.String("gs_buckets", "", "Comma-separated list of google storage bucket that hold uploaded images.")
		hashesGSPath        = flag.String("hashes_gs_path", "", "GS path, where the known hashes file should be stored. If empty no file will be written. Format: <bucket>/<path>.")
		imageDir            = flag.String("image_dir", "/tmp/imagedir", "What directory to store test and diff images in.")
		indexInterval       = flag.Duration("idx_interval", 5*time.Minute, "Interval at which the indexer calculates the search index.")
		internalPort        = flag.String("internal_port", "", "HTTP service address for internal clients, e.g. probers. No authentication on this port.")
		local               = flag.Bool("local", false, "Running locally if true. As opposed to in production.")
		memProfile          = flag.Duration("memprofile", 0, "Duration for which to profile memory. After this duration the program writes the memory profile and exits.")
		nCommits            = flag.Int("n_commits", 50, "Number of recent commits to include in the analysis.")
		noCloudLog          = flag.Bool("no_cloud_log", false, "Disables cloud logging. Primarily for running locally and in K8s.")
		port                = flag.String("port", ":9000", "HTTP service address (e.g., ':9000')")
		projectID           = flag.String("project_id", common.PROJECT_ID, "GCP project ID.")
		promPort            = flag.String("prom_port", ":20000", "Metrics service address (e.g., ':10110')")
		pubWhiteList        = flag.String("public_whitelist", "", fmt.Sprintf("File name of a JSON5 file that contains a query with the traces to white list. If set to '%s' everything is included. This is required if force_login is false.", WHITELIST_ALL))
		redirectURL         = flag.String("redirect_url", "https://gold.skia.org/oauth2callback/", "OAuth2 redirect url. Only used when local=false.")
		resourcesDir        = flag.String("resources_dir", "", "The directory to find templates, JS, and CSS files. If blank the directory relative to the source code files will be used.")
		serviceAccountFile  = flag.String("service_account_file", "", "Credentials file for service account.")
		showBotProgress     = flag.Bool("show_bot_progress", true, "Query status.skia.org for the progress of bot results.")
		siteURL             = flag.String("site_url", "https://gold.skia.org", "URL where this app is hosted.")
		sparseInput         = flag.Bool("sparse", false, "Sparse input expected. Filter out 'empty' commits.")
		storageDir          = flag.String("storage_dir", "", "Directory to store reproducible application data. [DEPRECATED]")
		traceservice        = flag.String("trace_service", "localhost:10000", "The address of the traceservice endpoint.")
	)

	var err error

	// Needed to use TimeSortableKey(...) which relies on an RNG. See docs there.
	rand.Seed(time.Now().UnixNano())

	mainTimer := timer.New("main init")

	// Parse the options. So we can configure logging.
	flag.Parse()

	// Set up the logging options.
	logOpts := []common.Opt{
		common.PrometheusOpt(promPort),
	}

	// Should we disable cloud logging.
	if !*noCloudLog {
		logOpts = append(logOpts, common.CloudLoggingOpt())
	}
	_, appName := filepath.Split(os.Args[0])
	common.InitWithMust(appName, logOpts...)
	skiaversion.MustLogVersion()

	ctx := context.Background()
	skiaversion.MustLogVersion()

	// Enable the memory profiler if memProfile was set.
	// TODO(stephana): This should be moved to a HTTP endpoint that
	// only responds to internal IP addresses/ports.
	if *memProfile > 0 {
		time.AfterFunc(*memProfile, func() {
			sklog.Infof("Writing Memory Profile")
			f, err := ioutil.TempFile("./", "memory-profile")
			if err != nil {
				sklog.Fatalf("Unable to create memory profile file: %s", err)
			}
			if err := pprof.WriteHeapProfile(f); err != nil {
				sklog.Fatalf("Unable to write memory profile file: %v", err)
			}
			util.Close(f)
			sklog.Infof("Memory profile written to %s", f.Name())

			os.Exit(0)
		})
	}

	if *cpuProfile > 0 {
		sklog.Infof("Writing CPU Profile")
		f, err := ioutil.TempFile("./", "cpu-profile")
		if err != nil {
			sklog.Fatalf("Unable to create cpu profile file: %s", err)
		}

		if err := pprof.StartCPUProfile(f); err != nil {
			sklog.Fatalf("Unable to write cpu profile file: %v", err)
		}
		time.AfterFunc(*cpuProfile, func() {
			pprof.StopCPUProfile()
			util.Close(f)
			sklog.Infof("CPU profile written to %s", f.Name())
			os.Exit(0)
		})
	}

	// Set the resource directory if it's empty. Useful for running locally.
	if *resourcesDir == "" {
		_, filename, _, _ := runtime.Caller(0)
		*resourcesDir = filepath.Join(filepath.Dir(filename), "../..")
		*resourcesDir += "/frontend"
	}

	// Set up login
	useRedirectURL := *redirectURL
	if *local {
		useRedirectURL = fmt.Sprintf("http://localhost%s/oauth2callback/", *port)
	}
	sklog.Infof("The allowed list of users is: %q", *authorizedUsers)
	if err := login.Init(useRedirectURL, *authorizedUsers, *clientSecretFile); err != nil {
		sklog.Fatalf("Failed to initialize the login system: %s", err)
	}

	// Get the token source for the service account with access to GCS, the Monorail issue tracker,
	// cloud pubsub, and datastore.
	deprecatedTS, err := auth.NewJWTServiceAccountTokenSource("", *serviceAccountFile, datastore.ScopeDatastore, gstorage.CloudPlatformScope, "https://www.googleapis.com/auth/userinfo.email")
	if err != nil {
		sklog.Fatalf("Failed to authenticate service account: %s", err)
	}
	// TODO(dogben): Ok to add request/dial timeouts?
	client := httputils.DefaultClientConfig().WithTokenSource(deprecatedTS).WithoutRetries().Client()

	// serviceName uniquely identifies this host and app and is used as ID for other services.
	nodeName, err := gevent.GetNodeName(appName, *local)
	if err != nil {
		sklog.Fatalf("Error getting unique service name: %s", err)
	}

	// If the addresses for a remote DiffStore were given, then set it up
	// otherwise create an embedded DiffStore instance.
	var diffStore diff.DiffStore = nil
	if (*diffServerGRPCAddr != "") || (*diffServerImageAddr != "") {
		// Create the client connection and connect to the server.
		conn, err := grpc.Dial(*diffServerGRPCAddr,
			grpc.WithInsecure(),
			grpc.WithDefaultCallOptions(
				grpc.MaxCallSendMsgSize(diffstore.MAX_MESSAGE_SIZE),
				grpc.MaxCallRecvMsgSize(diffstore.MAX_MESSAGE_SIZE)))
		if err != nil {
			sklog.Fatalf("Unable to connect to grpc service: %s", err)
		}

		codec := diffstore.MetricMapCodec{}
		diffStore, err = diffstore.NewNetDiffStore(conn, *diffServerImageAddr, codec)
		if err != nil {
			sklog.Fatalf("Unable to initialize NetDiffStore: %s", err)
		}
		sklog.Infof("DiffStore: NetDiffStore initiated.")
	} else {
		if *gsBucketNames == "" {
			sklog.Fatalf("Must specify --gs_buckets or (--diff_server_http and --diff_server_grpc)")
		}
		mapper := disk_mapper.New(&diff.DiffMetrics{})
		diffStore, err = diffstore.NewMemDiffStore(client, *imageDir, strings.Split(*gsBucketNames, ","), diffstore.DEFAULT_GCS_IMG_DIR_NAME, *cacheSize, mapper)
		if err != nil {
			sklog.Fatalf("Allocating local DiffStore failed: %s", err)
		}
		sklog.Infof("DiffStore: MemDiffStore initiated.")
	}

	// Set up the event bus which can either be in-process or distributed
	// depending whether an PubSub topic was defined.
	var evt eventbus.EventBus = nil
	if *eventTopic != "" {
		evt, err = gevent.New(*projectID, *eventTopic, nodeName, option.WithTokenSource(deprecatedTS))
		if err != nil {
			sklog.Fatalf("Unable to create global event client. Got error: %s", err)
		}
		sklog.Infof("Global eventbus for topic '%s' and subscriber '%s' created.", *eventTopic, nodeName)
	} else {
		evt = eventbus.New()
	}

	var vcs vcsinfo.VCS
	if *gitBTInstanceID != "" && *gitBTTableID != "" {
		btConf := &bt_gitstore.BTConfig{
			ProjectID:  *projectID,
			InstanceID: *gitBTInstanceID,
			TableID:    *gitBTTableID,
		}

		// If the repoURL is numeric then it is treated like the numeric ID of a repository and
		// we look up the corresponding repo URL.
		useRepoURL := *gitRepoURL
		if foundRepoURL, ok := bt_gitstore.RepoURLFromID(ctx, btConf, *gitRepoURL); ok {
			useRepoURL = foundRepoURL
		}
		var gitStore gitstore.GitStore
		gitStore, err = bt_gitstore.New(ctx, btConf, useRepoURL)
		if err != nil {
			sklog.Fatalf("Error instantiating gitstore: %s", err)
		}

		gitilesRepo := gitiles.NewRepo("", "", nil)

		trackNCommits := *nCommits
		if *sparseInput {
			// If the input is sparse we watch a magnitude more commits to make sure we don't miss any
			// commit.
			trackNCommits *= 10
		}
		vcs, err = bt_vcs.New(gitStore, "master", gitilesRepo, evt, trackNCommits)
	} else {
		vcs, err = gitinfo.CloneOrUpdate(ctx, *gitRepoURL, *gitRepoDir, false)
	}
	if err != nil {
		sklog.Fatalf("Error creating VCS instance: %s", err)
	}

	// If this is an authoritative instance we need an authenticated Gerrit client
	// because it needs to write.
	gitcookiesPath := ""
	if *authoritative {
		// Set up an authenticated Gerrit client.
		gitcookiesPath = gerrit.DefaultGitCookiesPath()
		if !*local {
			if gitcookiesPath, err = gerrit.GitCookieAuthDaemonPath(); err != nil {
				sklog.Fatalf("Error retrieving git_cookie_authdaemon path: %s", err)
			}
		}
	}
	gerritAPI, err := gerrit.NewGerrit(*gerritURL, gitcookiesPath, nil)
	if err != nil {
		sklog.Fatalf("Failed to create Gerrit client: %s", err)
	}

	// Connect to traceDB and create the builders.
	db, err := tracedb.NewTraceServiceDBFromAddress(*traceservice, types.GoldenTraceBuilder)
	if err != nil {
		sklog.Fatalf("Failed to connect to tracedb: %s", err)
	}

	// TODO(stephana): All dependencies on storageDir should be removed once we have landed
	// all instances in K8s.

	// If a storage directory was provided we can use it to cache tiles.
	mtbCache := ""
	if *storageDir != "" {
		if _, err := fileutil.EnsureDirExists(*storageDir); err != nil {
			sklog.Fatalf("Failed to make storageDir: %s", err)
		}
		mtbCache = filepath.Join(*storageDir, "cached-last-tile")
	}

	masterTileBuilder, err := tracedb.NewMasterTileBuilder(ctx, db, vcs, *nCommits, evt, mtbCache)
	if err != nil {
		sklog.Fatalf("Failed to build trace/db.DB: %s", err)
	}

	gsClientOpt := storage.GCSClientOptions{
		HashesGSPath:   *hashesGSPath,
		BaselineGSPath: *baselineGSPath,
	}

	gsClient, err := storage.NewGCSClient(client, gsClientOpt)
	if err != nil {
		sklog.Fatalf("Unable to create GCSClient: %s", err)
	}

	if err := ds.InitWithOpt(*projectID, *dsNamespace, option.WithTokenSource(deprecatedTS)); err != nil {
		sklog.Fatalf("Unable to configure cloud datastore: %s", err)
	}

	if *fsNamespace == "" {
		sklog.Fatalf("--fs_namespace must be set")
	}

	var fsClient *firestore.Client
	if *fsLegacyAuth {
		fsClient, err = firestore.NewClient(context.Background(), *fsProjectID, "gold", *fsNamespace, deprecatedTS)
		if err != nil {
			sklog.Fatalf("Unable to configure Firestore: %s", err)
		}
	} else {
		// Auth note: the underlying firestore.NewClient looks at the
		// GOOGLE_APPLICATION_CREDENTIALS env variable, so we don't need to supply
		// a token source.
		fsClient, err = firestore.NewClient(context.Background(), *fsProjectID, "gold", *fsNamespace, nil)
		if err != nil {
			sklog.Fatalf("Unable to configure Firestore: %s", err)
		}
	}

	// Set up the cloud expectations store
	expStore, err := fs_expstore.New(fsClient, evt, fs_expstore.ReadWrite)
	if err != nil {
		sklog.Fatalf("Unable to initialize fs_expstore: %s", err)
	}

	tryjobStore, err := tryjobstore.NewCloudTryjobStore(ds.DS, evt)
	if err != nil {
		sklog.Fatalf("Unable to instantiate tryjob store: %s", err)
	}
	tryjobMonitor := gerrit_tryjob_monitor.New(tryjobStore, expStore, gerritAPI, *siteURL, evt, *authoritative)

	// Initialize the Baseliner instance from the values set above.
	baseliner, err := gcs_baseliner.New(gsClient, expStore, tryjobStore, vcs)
	if err != nil {
		sklog.Fatalf("Error initializing baseliner: %s", err)
	}

	// Extract the site URL
	storages := &storage.Storage{
		DiffStore:         diffStore,
		ExpectationsStore: expStore,
		TraceDB:           db,
		MasterTileBuilder: masterTileBuilder,
		NCommits:          *nCommits,
		EventBus:          evt,
		TryjobStore:       tryjobStore,
		TryjobMonitor:     tryjobMonitor,
		GerritAPI:         gerritAPI,
		GCSClient:         gsClient,
		VCS:               vcs,
		IsAuthoritative:   *authoritative,
		SiteURL:           *siteURL,
		IsSparseTile:      *sparseInput,
		Baseliner:         baseliner,
	}

	// Load the whitelist if there is one and disable querying for issues.
	if *pubWhiteList != "" && *pubWhiteList != WHITELIST_ALL {
		if err := storages.LoadWhiteList(*pubWhiteList); err != nil {
			sklog.Fatalf("Empty or invalid white list file. A non-empty white list must be provided if force_login=false.")
		}
	}

	// Check if this is public instance. If so make sure there is a white list.
	if !*forceLogin && (*pubWhiteList == "") {
		sklog.Fatalf("Empty whitelist file. A non-empty white list must be provided if force_login=false.")
	}

	// openSite indicates whether this can expose all end-points. The user still has to be authenticated.
	openSite := (*pubWhiteList == WHITELIST_ALL) || *forceLogin

	// TODO(kjlubick): storage.Storage contains an IgnoreStore, so we can't pass ignore
	// a storage.Storage directly. There probably shouldn't be one monolithic storage object,
	// but each package could define its own.
	if storages.IgnoreStore, err = ignore.NewCloudIgnoreStore(ds.DS, storages.ExpectationsStore, storages.GetTileStreamNow(time.Minute, "gold-ignore-store")); err != nil {
		sklog.Fatalf("Unable to create cloud ignorestore: %s", err)
	}

	if err := ignore.Init(storages.IgnoreStore); err != nil {
		sklog.Fatalf("Failed to start monitoring for expired ignore rules: %s", err)
	}

	// Rebuild the index every few minutes.
	sklog.Infof("Starting indexer to run every %s", *indexInterval)
	ixr, err := indexer.New(storages, warmer.New(), *indexInterval)
	if err != nil {
		sklog.Fatalf("Failed to create indexer: %s", err)
	}
	sklog.Infof("Indexer created.")

	searchAPI, err := search.NewSearchAPI(storages, ixr)
	if err != nil {
		sklog.Fatalf("Failed to create instance of search API: %s", err)
	}
	sklog.Infof("Search API created")

	issueTracker := issues.NewMonorailIssueTracker(client, issues.PROJECT_SKIA)

	statusWatcher, err := status.New(storages)
	if err != nil {
		sklog.Fatalf("Failed to initialize status watcher: %s", err)
	}
	sklog.Infof("statusWatcher created")

	handlers := web.WebHandlers{
		Storages:      storages,
		StatusWatcher: statusWatcher,
		Indexer:       ixr,
		IssueTracker:  issueTracker,
		SearchAPI:     searchAPI,
	}

	mainTimer.Stop()

	// loggedRouter contains all the endpoints that are logged. See the call below to
	// LoggingGzipRequestResponse.
	loggedRouter := mux.NewRouter()

	// Set up the resource to serve the image files.
	imgHandler, err := handlers.Storages.DiffStore.ImageHandler(IMAGE_URL_PREFIX)
	if err != nil {
		sklog.Fatalf("Unable to get image handler: %s", err)
	}

	// New Polymer based UI endpoints.
	loggedRouter.PathPrefix("/res/").HandlerFunc(web.MakeResourceHandler(*resourcesDir))
	loggedRouter.HandleFunc(OAUTH2_CALLBACK_PATH, login.OAuth2CallbackHandler)

	// TODO(stephana): remove "/_/hashes" in favor of "/json/hashes" once all clients have switched.

	// /_/hashes is used by the bots to find hashes it does not need to upload.
	loggedRouter.HandleFunc(shared.LEGACY_KNOWN_HASHES_ROUTE, handlers.TextKnownHashesProxy).Methods("GET")
	loggedRouter.HandleFunc("/json/version", skiaversion.JsonHandler)
	loggedRouter.HandleFunc("/loginstatus/", login.StatusHandler)
	loggedRouter.HandleFunc("/logout/", login.LogoutHandler)

	// Set up a subrouter for the '/json' routes which make up the Gold API.
	// This makes routing faster, but also returns a failure when an /json route is
	// requested that doesn't exit. If we did this differently a call to a non-existing endpoint
	// would be handled by the route that handles the returning the index template and make debugging
	// confusing.
	jsonRouter := loggedRouter.PathPrefix("/json").Subrouter()
	trim := func(r string) string { return strings.TrimPrefix(r, "/json") }

	jsonRouter.HandleFunc(trim(shared.KNOWN_HASHES_ROUTE), handlers.TextKnownHashesProxy).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/byblame"), handlers.JsonByBlameHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/cleardigests"), handlers.JsonClearDigests).Methods("POST")
	jsonRouter.HandleFunc(trim("/json/clusterdiff"), handlers.JsonClusterDiffHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/cmp"), handlers.JsonCompareTestHandler).Methods("POST")
	jsonRouter.HandleFunc(trim("/json/commits"), handlers.JsonCommitsHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/details"), handlers.JsonDetailsHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/diff"), handlers.JsonDiffHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/export"), handlers.JsonExportHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/failure"), handlers.JsonListFailureHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/failure/clear"), handlers.JsonClearFailureHandler).Methods("POST")
	jsonRouter.HandleFunc(trim("/json/gitlog"), handlers.JsonGitLogHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/list"), handlers.JsonListTestsHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/paramset"), handlers.JsonParamsHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/search"), handlers.JsonSearchHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/triage"), handlers.JsonTriageHandler).Methods("POST")
	jsonRouter.HandleFunc(trim("/json/triagelog"), handlers.JsonTriageLogHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/triagelog/undo"), handlers.JsonTriageUndoHandler).Methods("POST")
	jsonRouter.HandleFunc(trim("/json/tryjob"), handlers.JsonTryjobListHandler).Methods("GET")
	jsonRouter.HandleFunc(trim("/json/tryjob/{id}"), handlers.JsonTryjobSummaryHandler).Methods("GET")

	// Retrieving that baseline for master and an Gerrit issue are handled the same way
	// These routes can be served with baseline_server for higher availability.
	jsonRouter.HandleFunc(trim(shared.EXPECTATIONS_ROUTE), handlers.JsonBaselineHandler).Methods("GET")
	jsonRouter.HandleFunc(trim(shared.EXPECTATIONS_ISSUE_ROUTE), handlers.JsonBaselineHandler).Methods("GET")

	jsonRouter.HandleFunc(trim("/json/refresh/{id}"), handlers.JsonRefreshIssue).Methods("GET")

	// Only expose these endpoints if login is enforced across the app or this an open site.
	if openSite {
		jsonRouter.HandleFunc(trim("/json/ignores"), handlers.JsonIgnoresHandler).Methods("GET")
		jsonRouter.HandleFunc(trim("/json/ignores/add/"), handlers.JsonIgnoresAddHandler).Methods("POST")
		jsonRouter.HandleFunc(trim("/json/ignores/del/{id}"), handlers.JsonIgnoresDeleteHandler).Methods("POST")
		jsonRouter.HandleFunc(trim("/json/ignores/save/{id}"), handlers.JsonIgnoresUpdateHandler).Methods("POST")
	}

	// Make sure we return a 404 for anything that starts with /json and could not be found.
	jsonRouter.HandleFunc("/{ignore:.*}", http.NotFound)
	loggedRouter.HandleFunc("/json", http.NotFound)

	// For everything else serve the same markup.
	indexFile := *resourcesDir + "/index.html"
	indexTemplate := template.Must(template.New("").ParseFiles(indexFile)).Lookup("index.html")

	// appConfig is injected into the header of the index file.
	appConfig := &struct {
		BaseRepoURL        string   `json:"baseRepoURL"`
		DefaultCorpus      string   `json:"defaultCorpus"`
		DefaultMatchFields []string `json:"defaultMatchFields"`
		ShowBotProgress    bool     `json:"showBotProgress"`
		Title              string   `json:"title"`
		IsPublic           bool     `json:"isPublic"` // If true this is not open but restrictions apply.
	}{
		BaseRepoURL:        *gitRepoURL,
		DefaultCorpus:      *defaultCorpus,
		DefaultMatchFields: strings.Split(*defaultMatchFields, ","),
		ShowBotProgress:    *showBotProgress,
		Title:              *appTitle,
		IsPublic:           !openSite,
	}

	loggedRouter.PathPrefix("/").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/html")

		// Reload the template if we are running locally.
		if *local {
			indexTemplate = template.Must(template.New("").ParseFiles(indexFile)).Lookup("index.html")
		}
		if err := indexTemplate.Execute(w, appConfig); err != nil {
			sklog.Errorf("Failed to expand template: %s", err)
			return
		}
	})

	// set up the app router that might be authenticated and logs everything except for the status
	// endpoint which is polled a lot.
	appRouter := mux.NewRouter()
	appRouter.HandleFunc("/json/trstatus", handlers.JsonStatusHandler)
	// Images should not be served gzipped, which can sometimes have issues
	// when serving an image from a NetDiffstore with HTTP2. Additionally, is wasteful
	// given PNGs typically have zlib compression anyway.
	appRouter.PathPrefix(IMAGE_URL_PREFIX).Handler(imgHandler)
	appRouter.PathPrefix("/").Handler(httputils.LoggingGzipRequestResponse(loggedRouter))

	// Use the appRouter as a handler and wrap it into middleware that enforces authentication if
	// necessary it was requested via the force_login flag.
	appHandler := http.Handler(appRouter)
	if *forceLogin {
		appHandler = login.ForceAuth(appRouter, OAUTH2_CALLBACK_PATH)
	}

	// The appHandler contains all application specific routes that are have logging and
	// authentication configured. Now we wrap it into the router that is exposed to the host
	// (aka the K8s container) which requires that some routes are never logged or authenticated.
	rootRouter := mux.NewRouter()
	rootRouter.HandleFunc("/healthz", httputils.ReadyHandleFunc)
	rootRouter.PathPrefix("/").Handler(appHandler)

	// Start the internal server on the internal port if requested.
	if *internalPort != "" {
		// Add the profiling endpoints to the internal router.
		internalRouter := mux.NewRouter()

		// Set up the health check endpoint.
		internalRouter.HandleFunc("/healthz", httputils.ReadyHandleFunc)

		// Register pprof handlers
		internalRouter.HandleFunc("/debug/pprof/", netpprof.Index)
		internalRouter.HandleFunc("/debug/pprof/cmdline", netpprof.Cmdline)
		internalRouter.HandleFunc("/debug/pprof/profile", netpprof.Profile)
		internalRouter.HandleFunc("/debug/pprof/symbol", netpprof.Symbol)
		internalRouter.HandleFunc("/debug/pprof/trace", netpprof.Trace)

		// Add the rest of the application without any authentication that was configured.
		internalRouter.PathPrefix("/").Handler(appRouter)

		go func() {
			sklog.Infof("Internal server on  http://127.0.0.1" + *internalPort)
			sklog.Fatal(http.ListenAndServe(*internalPort, internalRouter))
		}()
	}

	// Start the server
	sklog.Infof("Serving on http://127.0.0.1" + *port)
	sklog.Fatal(http.ListenAndServe(*port, rootRouter))
}