// Copyright (C) The Arvados Authors. All rights reserved.
//
// SPDX-License-Identifier: AGPL-3.0

package controller

import (
	"context"
	"crypto/tls"
	"encoding/json"
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"strings"
	"testing"
	"time"

	"git.arvados.org/arvados.git/sdk/go/arvados"
	"git.arvados.org/arvados.git/sdk/go/arvadostest"
	"git.arvados.org/arvados.git/sdk/go/auth"
	"git.arvados.org/arvados.git/sdk/go/ctxlog"
	"git.arvados.org/arvados.git/sdk/go/httpserver"
	"github.com/prometheus/client_golang/prometheus"
	check "gopkg.in/check.v1"
)

// Gocheck boilerplate
func Test(t *testing.T) {
	check.TestingT(t)
}

var _ = check.Suite(&HandlerSuite{})

type HandlerSuite struct {
	cluster *arvados.Cluster
	handler http.Handler
	ctx     context.Context
	cancel  context.CancelFunc
}

func (s *HandlerSuite) SetUpTest(c *check.C) {
	s.ctx, s.cancel = context.WithCancel(context.Background())
	s.ctx = ctxlog.Context(s.ctx, ctxlog.New(os.Stderr, "json", "debug"))
	s.cluster = &arvados.Cluster{
		ClusterID:  "zzzzz",
		PostgreSQL: integrationTestCluster().PostgreSQL,
	}
	s.cluster.API.RequestTimeout = arvados.Duration(5 * time.Minute)
	s.cluster.TLS.Insecure = true
	arvadostest.SetServiceURL(&s.cluster.Services.RailsAPI, "https://"+os.Getenv("ARVADOS_TEST_API_HOST"))
	arvadostest.SetServiceURL(&s.cluster.Services.Controller, "http://localhost:/")
	s.handler = newHandler(s.ctx, s.cluster, "", prometheus.NewRegistry())
}

func (s *HandlerSuite) TearDownTest(c *check.C) {
	s.cancel()
}

func (s *HandlerSuite) TestConfigExport(c *check.C) {
	s.cluster.ManagementToken = "secret"
	s.cluster.SystemRootToken = "secret"
	s.cluster.Collections.BlobSigning = true
	s.cluster.Collections.BlobSigningTTL = arvados.Duration(23 * time.Second)
	for _, method := range []string{"GET", "OPTIONS"} {
		req := httptest.NewRequest(method, "/arvados/v1/config", nil)
		resp := httptest.NewRecorder()
		s.handler.ServeHTTP(resp, req)
		c.Log(resp.Body.String())
		if !c.Check(resp.Code, check.Equals, http.StatusOK) {
			continue
		}
		c.Check(resp.Header().Get("Access-Control-Allow-Origin"), check.Equals, `*`)
		c.Check(resp.Header().Get("Access-Control-Allow-Methods"), check.Matches, `.*\bGET\b.*`)
		c.Check(resp.Header().Get("Access-Control-Allow-Headers"), check.Matches, `.+`)
		if method == "OPTIONS" {
			c.Check(resp.Body.String(), check.HasLen, 0)
			continue
		}
		var cluster arvados.Cluster
		err := json.Unmarshal(resp.Body.Bytes(), &cluster)
		c.Check(err, check.IsNil)
		c.Check(cluster.ManagementToken, check.Equals, "")
		c.Check(cluster.SystemRootToken, check.Equals, "")
		c.Check(cluster.Collections.BlobSigning, check.Equals, true)
		c.Check(cluster.Collections.BlobSigningTTL, check.Equals, arvados.Duration(23*time.Second))
	}
}

func (s *HandlerSuite) TestProxyDiscoveryDoc(c *check.C) {
	req := httptest.NewRequest("GET", "/discovery/v1/apis/arvados/v1/rest", nil)
	resp := httptest.NewRecorder()
	s.handler.ServeHTTP(resp, req)
	c.Check(resp.Code, check.Equals, http.StatusOK)
	var dd arvados.DiscoveryDocument
	err := json.Unmarshal(resp.Body.Bytes(), &dd)
	c.Check(err, check.IsNil)
	c.Check(dd.BlobSignatureTTL, check.Not(check.Equals), int64(0))
	c.Check(dd.BlobSignatureTTL > 0, check.Equals, true)
	c.Check(len(dd.Resources), check.Not(check.Equals), 0)
	c.Check(len(dd.Schemas), check.Not(check.Equals), 0)
}

func (s *HandlerSuite) TestRequestTimeout(c *check.C) {
	s.cluster.API.RequestTimeout = arvados.Duration(time.Nanosecond)
	req := httptest.NewRequest("GET", "/discovery/v1/apis/arvados/v1/rest", nil)
	resp := httptest.NewRecorder()
	s.handler.ServeHTTP(resp, req)
	c.Check(resp.Code, check.Equals, http.StatusBadGateway)
	var jresp httpserver.ErrorResponse
	err := json.Unmarshal(resp.Body.Bytes(), &jresp)
	c.Check(err, check.IsNil)
	c.Assert(len(jresp.Errors), check.Equals, 1)
	c.Check(jresp.Errors[0], check.Matches, `.*context deadline exceeded.*`)
}

func (s *HandlerSuite) TestProxyWithoutToken(c *check.C) {
	req := httptest.NewRequest("GET", "/arvados/v1/users/current", nil)
	resp := httptest.NewRecorder()
	s.handler.ServeHTTP(resp, req)
	c.Check(resp.Code, check.Equals, http.StatusUnauthorized)
	jresp := map[string]interface{}{}
	err := json.Unmarshal(resp.Body.Bytes(), &jresp)
	c.Check(err, check.IsNil)
	c.Check(jresp["errors"], check.FitsTypeOf, []interface{}{})
}

func (s *HandlerSuite) TestProxyWithToken(c *check.C) {
	req := httptest.NewRequest("GET", "/arvados/v1/users/current", nil)
	req.Header.Set("Authorization", "Bearer "+arvadostest.ActiveToken)
	resp := httptest.NewRecorder()
	s.handler.ServeHTTP(resp, req)
	c.Check(resp.Code, check.Equals, http.StatusOK)
	var u arvados.User
	err := json.Unmarshal(resp.Body.Bytes(), &u)
	c.Check(err, check.IsNil)
	c.Check(u.UUID, check.Equals, arvadostest.ActiveUserUUID)
}

func (s *HandlerSuite) TestProxyWithTokenInRequestBody(c *check.C) {
	req := httptest.NewRequest("POST", "/arvados/v1/users/current", strings.NewReader(url.Values{
		"_method":   {"GET"},
		"api_token": {arvadostest.ActiveToken},
	}.Encode()))
	req.Header.Set("Content-type", "application/x-www-form-urlencoded")
	resp := httptest.NewRecorder()
	s.handler.ServeHTTP(resp, req)
	c.Check(resp.Code, check.Equals, http.StatusOK)
	var u arvados.User
	err := json.Unmarshal(resp.Body.Bytes(), &u)
	c.Check(err, check.IsNil)
	c.Check(u.UUID, check.Equals, arvadostest.ActiveUserUUID)
}

func (s *HandlerSuite) TestProxyNotFound(c *check.C) {
	req := httptest.NewRequest("GET", "/arvados/v1/xyzzy", nil)
	resp := httptest.NewRecorder()
	s.handler.ServeHTTP(resp, req)
	c.Check(resp.Code, check.Equals, http.StatusNotFound)
	jresp := map[string]interface{}{}
	err := json.Unmarshal(resp.Body.Bytes(), &jresp)
	c.Check(err, check.IsNil)
	c.Check(jresp["errors"], check.FitsTypeOf, []interface{}{})
}

func (s *HandlerSuite) TestLogoutGoogle(c *check.C) {
	s.cluster.Login.Google.Enable = true
	s.cluster.Login.Google.ClientID = "test"
	req := httptest.NewRequest("GET", "https://0.0.0.0:1/logout?return_to=https://example.com/foo", nil)
	resp := httptest.NewRecorder()
	s.handler.ServeHTTP(resp, req)
	if !c.Check(resp.Code, check.Equals, http.StatusFound) {
		c.Log(resp.Body.String())
	}
	c.Check(resp.Header().Get("Location"), check.Equals, "https://example.com/foo")
}

func (s *HandlerSuite) TestValidateV1APIToken(c *check.C) {
	req := httptest.NewRequest("GET", "/arvados/v1/users/current", nil)
	user, ok, err := s.handler.(*Handler).validateAPItoken(req, arvadostest.ActiveToken)
	c.Assert(err, check.IsNil)
	c.Check(ok, check.Equals, true)
	c.Check(user.Authorization.UUID, check.Equals, arvadostest.ActiveTokenUUID)
	c.Check(user.Authorization.APIToken, check.Equals, arvadostest.ActiveToken)
	c.Check(user.Authorization.Scopes, check.DeepEquals, []string{"all"})
	c.Check(user.UUID, check.Equals, arvadostest.ActiveUserUUID)
}

func (s *HandlerSuite) TestValidateV2APIToken(c *check.C) {
	req := httptest.NewRequest("GET", "/arvados/v1/users/current", nil)
	user, ok, err := s.handler.(*Handler).validateAPItoken(req, arvadostest.ActiveTokenV2)
	c.Assert(err, check.IsNil)
	c.Check(ok, check.Equals, true)
	c.Check(user.Authorization.UUID, check.Equals, arvadostest.ActiveTokenUUID)
	c.Check(user.Authorization.APIToken, check.Equals, arvadostest.ActiveToken)
	c.Check(user.Authorization.Scopes, check.DeepEquals, []string{"all"})
	c.Check(user.UUID, check.Equals, arvadostest.ActiveUserUUID)
	c.Check(user.Authorization.TokenV2(), check.Equals, arvadostest.ActiveTokenV2)
}

func (s *HandlerSuite) TestValidateRemoteToken(c *check.C) {
	saltedToken, err := auth.SaltToken(arvadostest.ActiveTokenV2, "abcde")
	c.Assert(err, check.IsNil)
	for _, trial := range []struct {
		code  int
		token string
	}{
		{http.StatusOK, saltedToken},
		{http.StatusUnauthorized, "bogus"},
	} {
		req := httptest.NewRequest("GET", "https://0.0.0.0:1/arvados/v1/users/current?remote=abcde", nil)
		req.Header.Set("Authorization", "Bearer "+trial.token)
		resp := httptest.NewRecorder()
		s.handler.ServeHTTP(resp, req)
		if !c.Check(resp.Code, check.Equals, trial.code) {
			c.Logf("HTTP %d: %s", resp.Code, resp.Body.String())
		}
	}
}

func (s *HandlerSuite) TestCreateAPIToken(c *check.C) {
	req := httptest.NewRequest("GET", "/arvados/v1/users/current", nil)
	auth, err := s.handler.(*Handler).createAPItoken(req, arvadostest.ActiveUserUUID, nil)
	c.Assert(err, check.IsNil)
	c.Check(auth.Scopes, check.DeepEquals, []string{"all"})

	user, ok, err := s.handler.(*Handler).validateAPItoken(req, auth.TokenV2())
	c.Assert(err, check.IsNil)
	c.Check(ok, check.Equals, true)
	c.Check(user.Authorization.UUID, check.Equals, auth.UUID)
	c.Check(user.Authorization.APIToken, check.Equals, auth.APIToken)
	c.Check(user.Authorization.Scopes, check.DeepEquals, []string{"all"})
	c.Check(user.UUID, check.Equals, arvadostest.ActiveUserUUID)
	c.Check(user.Authorization.TokenV2(), check.Equals, auth.TokenV2())
}

func (s *HandlerSuite) CheckObjectType(c *check.C, url string, token string, skippedFields map[string]bool) {
	var proxied, direct map[string]interface{}
	var err error

	// Get collection from controller
	req := httptest.NewRequest("GET", url, nil)
	req.Header.Set("Authorization", "Bearer "+token)
	resp := httptest.NewRecorder()
	s.handler.ServeHTTP(resp, req)
	c.Assert(resp.Code, check.Equals, http.StatusOK,
		check.Commentf("Wasn't able to get data from the controller at %q", url))
	err = json.Unmarshal(resp.Body.Bytes(), &proxied)
	c.Check(err, check.Equals, nil)

	// Get collection directly from RailsAPI
	client := &http.Client{
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
		},
	}
	resp2, err := client.Get(s.cluster.Services.RailsAPI.ExternalURL.String() + url + "/?api_token=" + token)
	c.Check(err, check.Equals, nil)
	c.Assert(resp2.StatusCode, check.Equals, http.StatusOK,
		check.Commentf("Wasn't able to get data from the RailsAPI at %q", url))
	defer resp2.Body.Close()
	db, err := ioutil.ReadAll(resp2.Body)
	c.Check(err, check.Equals, nil)
	err = json.Unmarshal(db, &direct)
	c.Check(err, check.Equals, nil)

	// Check that all RailsAPI provided keys exist on the controller response.
	for k := range direct {
		if _, ok := skippedFields[k]; ok {
			continue
		} else if val, ok := proxied[k]; ok {
			if direct["kind"] == "arvados#collection" && k == "manifest_text" {
				// Tokens differ from request to request
				c.Check(strings.Split(val.(string), "+A")[0], check.Equals, strings.Split(direct[k].(string), "+A")[0])
			} else {
				c.Check(val, check.DeepEquals, direct[k],
					check.Commentf("RailsAPI %s key %q's value %q differs from controller's %q.", direct["kind"], k, direct[k], val))
			}
		} else {
			c.Errorf("%s's key %q missing on controller's response.", direct["kind"], k)
		}
	}
}

func (s *HandlerSuite) TestGetObjects(c *check.C) {
	// Get the 1st keep service's uuid from the running test server.
	req := httptest.NewRequest("GET", "/arvados/v1/keep_services/", nil)
	req.Header.Set("Authorization", "Bearer "+arvadostest.AdminToken)
	resp := httptest.NewRecorder()
	s.handler.ServeHTTP(resp, req)
	c.Assert(resp.Code, check.Equals, http.StatusOK)
	var ksList arvados.KeepServiceList
	json.Unmarshal(resp.Body.Bytes(), &ksList)
	c.Assert(len(ksList.Items), check.Not(check.Equals), 0)
	ksUUID := ksList.Items[0].UUID

	testCases := map[string]map[string]bool{
		"api_clients/" + arvadostest.TrustedWorkbenchAPIClientUUID:     nil,
		"api_client_authorizations/" + arvadostest.AdminTokenUUID:      nil,
		"authorized_keys/" + arvadostest.AdminAuthorizedKeysUUID:       nil,
		"collections/" + arvadostest.CollectionWithUniqueWordsUUID:     {"href": true},
		"containers/" + arvadostest.RunningContainerUUID:               nil,
		"container_requests/" + arvadostest.QueuedContainerRequestUUID: nil,
		"groups/" + arvadostest.AProjectUUID:                           nil,
		"keep_services/" + ksUUID:                                      nil,
		"links/" + arvadostest.ActiveUserCanReadAllUsersLinkUUID:       nil,
		"logs/" + arvadostest.CrunchstatForRunningJobLogUUID:           nil,
		"nodes/" + arvadostest.IdleNodeUUID:                            nil,
		"repositories/" + arvadostest.ArvadosRepoUUID:                  nil,
		"users/" + arvadostest.ActiveUserUUID:                          {"href": true},
		"virtual_machines/" + arvadostest.TestVMUUID:                   nil,
		"workflows/" + arvadostest.WorkflowWithDefinitionYAMLUUID:      nil,
	}
	for url, skippedFields := range testCases {
		s.CheckObjectType(c, "/arvados/v1/"+url, arvadostest.AdminToken, skippedFields)
	}
}

func (s *HandlerSuite) TestRedactRailsAPIHostFromErrors(c *check.C) {
	req := httptest.NewRequest("GET", "https://0.0.0.0:1/arvados/v1/collections/zzzzz-4zz18-abcdefghijklmno", nil)
	req.Header.Set("Authorization", "Bearer "+arvadostest.ActiveToken)
	resp := httptest.NewRecorder()
	s.handler.ServeHTTP(resp, req)
	c.Check(resp.Code, check.Equals, http.StatusNotFound)
	var jresp struct {
		Errors []string
	}
	c.Log(resp.Body.String())
	c.Assert(json.NewDecoder(resp.Body).Decode(&jresp), check.IsNil)
	c.Assert(jresp.Errors, check.HasLen, 1)
	c.Check(jresp.Errors[0], check.Matches, `.*//railsapi\.internal/arvados/v1/collections/.*: 404 Not Found.*`)
	c.Check(jresp.Errors[0], check.Not(check.Matches), `(?ms).*127.0.0.1.*`)
}