//go:build recorded

// The tests that check the apps' recorded requests in testdata. The recorded
// tag keeps them out of the test phase's pass with the race detector, and
// its second pass, without the race detector, runs them.

package coreruleset_test

import (
	"encoding/json"
	"os"
	"path/filepath"
	"slices"
	"strings"
	"testing"

	"sneak.berlin/go/smallwebwaf/internal/coreruleset"
)

// appsUnset labels the checks made while SWW_WAF_APPS is unset.
const appsUnset = "SWW_WAF_APPS unset"

// giteaRequests returns the recorded ordinary gitea requests in testdata.
// Each has the Referer of a page that names the same, as a page opened
// from it has.
func giteaRequests(t *testing.T) []request {
	t.Helper()

	text, err := os.ReadFile(filepath.Join("testdata", "gitea-requests.txt"))
	if err != nil {
		t.Fatal(err)
	}

	var requests []request

	for line := range strings.Lines(string(text)) {
		line = strings.TrimSpace(line)
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}

		target, header, _ := strings.Cut(line, " ")

		headers := []string{"Referer: http://git.example" + target}
		if header != "" {
			headers = append(headers, header)
		}

		requests = append(requests, get(target, headers...))
	}

	return requests
}

// TestOrdinaryGiteaRequestsPass checks gitea's recorded requests with
// SWW_WAF_APPS unset, and on giteaHost while SWW_WAF_APPS lists only gitea for it.
func TestOrdinaryGiteaRequestsPass(t *testing.T) {
	t.Parallel()

	const threshold = 5 // SWW_WAF_CORE_RULE_SET_ANOMALY_THRESHOLD's default

	requests := giteaRequests(t)
	giteaOnly := map[string][]string{giteaHost: {gitea}}

	for apps, crs := range map[string]*coreruleset.CoreRuleSet{
		appsUnset: atDefaults(t),
		"SWW_WAF_APPS=" + giteaHost + ":" + gitea: servingApps(t, giteaOnly),
	} {
		for _, r := range requests {
			got := inspect(t, crs, withHost(r, giteaHost))
			if got.Score >= threshold {
				t.Errorf(
					"%s: %s %q refused: %+v",
					apps,
					r.target,
					r.headers[1:],
					got,
				)
			}
		}
	}
}

// recordedRequest is a line of a file of recorded requests in testdata.
type recordedRequest struct {
	Method  string   `json:"method"`
	Target  string   `json:"target"`
	Headers []string `json:"headers"`
	Body    string   `json:"body"`
}

// recordedRequests returns the recorded ordinary requests in the file name
// in testdata, each with its body.
func recordedRequests(t *testing.T, name string) []recordedRequest {
	t.Helper()

	path := filepath.Join("testdata", name)

	text, err := os.ReadFile(path) //nolint:gosec // a file in testdata
	if err != nil {
		t.Fatal(err)
	}

	var requests []recordedRequest

	for line := range strings.Lines(string(text)) {
		if strings.HasPrefix(line, "#") {
			continue
		}

		var r recordedRequest

		err := json.Unmarshal([]byte(line), &r)
		if err != nil {
			t.Fatalf("%q: %v", line, err)
		}

		requests = append(requests, r)
	}

	return requests
}

// wantRecordedRequestsPass checks that none of the recorded ordinary
// requests in the file name in testdata is refused: with SWW_WAF_APPS unset, and
// on the hostname where they were recorded, otherHost for WordPress and
// example.com for the other apps, while SWW_WAF_APPS lists only app for it. Both
// times, they are checked at the defaults and while bodies are read. A
// request with neither a body nor a Content-Type header is checked only at
// the defaults: with neither, the set that reads bodies has nothing more to
// check. Each request runs as its own parallel subtest for each setting of
// SWW_WAF_APPS.
func wantRecordedRequestsPass(t *testing.T, name, app string) {
	t.Helper()

	const threshold = 5 // SWW_WAF_CORE_RULE_SET_ANOMALY_THRESHOLD's default

	requests := recordedRequests(t, name)

	for setting, apps := range map[string]map[string][]string{
		appsUnset:                        nil,
		"SWW_WAF_APPS lists only " + app: {"example.com": {app}, otherHost: {app}},
	} {
		defaults := servingApps(t, apps)
		bodies := shared(t, coreruleset.Params{
			ParanoiaLevel: 1, DisabledRules: defaultDisabledRules,
			BodyLimit: bodyLimit, Apps: apps,
		})

		for _, recorded := range requests {
			t.Run(
				setting+": "+recorded.Method+" "+recorded.Target,
				func(t *testing.T) {
					t.Parallel()

					r := request{
						recorded.Method,
						recorded.Target,
						recorded.Headers,
					}

					got, _ := inspectBody(t, defaults, r, recorded.Body)
					if got.Score >= threshold {
						t.Errorf(
							"%s %s refused: %+v",
							r.method,
							r.target,
							got,
						)
					}

					typed := slices.ContainsFunc(
						recorded.Headers,
						func(header string) bool {
							name, _, _ := strings.Cut(header, ":")

							return strings.EqualFold(name, "Content-Type")
						},
					)
					if recorded.Body == "" && !typed {
						return
					}

					got, _ = inspectBody(t, bodies, r, recorded.Body)
					if got.Score >= threshold {
						t.Errorf(
							"%s %s %.200q refused while bodies are read: %+v",
							r.method,
							r.target,
							recorded.Body,
							got,
						)
					}
				},
			)
		}
	}
}

func TestOrdinaryDrupalRequestsPass(t *testing.T) {
	t.Parallel()

	wantRecordedRequestsPass(t, "drupal-requests.txt", "drupal")
}

// TestOrdinaryForgejoRequestsPass checks Forgejo's recorded requests at the
// defaults only: with SWW_WAF_APPS unset, and on example.com, where they were
// recorded, while SWW_WAF_APPS lists only forgejo for it. While bodies are read,
// the Core Rule Set still refuses a new wiki page whose title and text name
// commands and files, as it does such text in gitea's comments
// (TestGiteaBodiesTheCoreRuleSetRefuses). The requests that name a file or a
// branch in a body are checked while bodies are read in
// TestForgejoNamesInBodiesPass.
func TestOrdinaryForgejoRequestsPass(t *testing.T) {
	t.Parallel()

	const threshold = 5 // SWW_WAF_CORE_RULE_SET_ANOMALY_THRESHOLD's default

	requests := recordedRequests(t, "forgejo-requests.txt")
	forgejoOnly := map[string][]string{"example.com": {forgejo}}

	for apps, crs := range map[string]*coreruleset.CoreRuleSet{
		appsUnset:                          atDefaults(t),
		"SWW_WAF_APPS=example.com:forgejo": servingApps(t, forgejoOnly),
	} {
		for _, recorded := range requests {
			r := request{recorded.Method, recorded.Target, recorded.Headers}
			if got, _ := inspectBody(t, crs, r, recorded.Body); got.Score >= threshold {
				t.Errorf(
					"%s: %s %s refused: %+v",
					apps,
					r.method,
					r.target,
					got,
				)
			}
		}
	}
}

// TestGiteaNamesInBodiesPass checks gitea's recorded requests that name a
// file or a branch in a body, while bodies are read too.
func TestGiteaNamesInBodiesPass(t *testing.T) {
	t.Parallel()

	wantRecordedRequestsPass(t, "gitea-names-in-bodies.txt", gitea)
}

// TestForgejoNamesInBodiesPass is TestGiteaNamesInBodiesPass for Forgejo.
func TestForgejoNamesInBodiesPass(t *testing.T) {
	t.Parallel()

	wantRecordedRequestsPass(t, "forgejo-names-in-bodies.txt", forgejo)
}

func TestOrdinaryGhostRequestsPass(t *testing.T) {
	t.Parallel()

	wantRecordedRequestsPass(t, "ghost-requests.txt", "ghost")
}

func TestOrdinaryMastodonRequestsPass(t *testing.T) {
	t.Parallel()

	wantRecordedRequestsPass(t, "mastodon-requests.txt", "mastodon")
}

func TestOrdinaryMediaWikiRequestsPass(t *testing.T) {
	t.Parallel()

	wantRecordedRequestsPass(t, "mediawiki-requests.txt", mediawiki)
}

func TestOrdinaryNextcloudRequestsPass(t *testing.T) {
	t.Parallel()

	wantRecordedRequestsPass(t, "nextcloud-requests.txt", nextcloud)
}

func TestOrdinaryVaultwardenRequestsPass(t *testing.T) {
	t.Parallel()

	wantRecordedRequestsPass(t, "vaultwarden-requests.txt", "vaultwarden")
}

func TestOrdinaryWordPressRequestsPass(t *testing.T) {
	t.Parallel()

	wantRecordedRequestsPass(t, "wordpress-requests.txt", wordpress)
}