package pluginproxy

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"net/url"
	"strings"
	"testing"
	"time"

	"github.com/grafana/grafana/pkg/api/datasource"
	"github.com/grafana/grafana/pkg/components/securejsondata"
	"github.com/grafana/grafana/pkg/models"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"golang.org/x/oauth2"
	macaron "gopkg.in/macaron.v1"

	"github.com/grafana/grafana/pkg/bus"
	"github.com/grafana/grafana/pkg/components/simplejson"
	"github.com/grafana/grafana/pkg/login/social"
	"github.com/grafana/grafana/pkg/plugins"
	"github.com/grafana/grafana/pkg/setting"
	"github.com/grafana/grafana/pkg/util"
)

func TestDataSourceProxy_routeRule(t *testing.T) {
	t.Run("Plugin with routes", func(t *testing.T) {
		plugin := &plugins.DataSourcePlugin{
			Routes: []*plugins.AppPluginRoute{
				{
					Path:    "api/v4/",
					URL:     "https://www.google.com",
					ReqRole: models.ROLE_EDITOR,
					Headers: []plugins.AppPluginRouteHeader{
						{Name: "x-header", Content: "my secret {{.SecureJsonData.key}}"},
					},
				},
				{
					Path:    "api/admin",
					URL:     "https://www.google.com",
					ReqRole: models.ROLE_ADMIN,
					Headers: []plugins.AppPluginRouteHeader{
						{Name: "x-header", Content: "my secret {{.SecureJsonData.key}}"},
					},
				},
				{
					Path: "api/anon",
					URL:  "https://www.google.com",
					Headers: []plugins.AppPluginRouteHeader{
						{Name: "x-header", Content: "my secret {{.SecureJsonData.key}}"},
					},
				},
				{
					Path: "api/common",
					URL:  "{{.JsonData.dynamicUrl}}",
					URLParams: []plugins.AppPluginRouteURLParam{
						{Name: "{{.JsonData.queryParam}}", Content: "{{.SecureJsonData.key}}"},
					},
					Headers: []plugins.AppPluginRouteHeader{
						{Name: "x-header", Content: "my secret {{.SecureJsonData.key}}"},
					},
				},
				{
					Path:    "api/restricted",
					ReqRole: models.ROLE_ADMIN,
				},
			},
		}

		origSecretKey := setting.SecretKey
		t.Cleanup(func() {
			setting.SecretKey = origSecretKey
		})
		setting.SecretKey = "password" //nolint:goconst

		key, err := util.Encrypt([]byte("123"), "password")
		require.NoError(t, err)

		ds := &models.DataSource{
			JsonData: simplejson.NewFromAny(map[string]interface{}{
				"clientId":   "asd",
				"dynamicUrl": "https://dynamic.grafana.com",
				"queryParam": "apiKey",
			}),
			SecureJsonData: map[string][]byte{
				"key": key,
			},
		}

		setUp := func() (*models.ReqContext, *http.Request) {
			req, err := http.NewRequest("GET", "http://localhost/asd", nil)
			require.NoError(t, err)
			ctx := &models.ReqContext{
				Context: &macaron.Context{
					Req: macaron.Request{Request: req},
				},
				SignedInUser: &models.SignedInUser{OrgRole: models.ROLE_EDITOR},
			}
			return ctx, req
		}

		t.Run("When matching route path", func(t *testing.T) {
			ctx, req := setUp()
			proxy, err := NewDataSourceProxy(ds, plugin, ctx, "api/v4/some/method", &setting.Cfg{})
			require.NoError(t, err)
			proxy.route = plugin.Routes[0]
			ApplyRoute(proxy.ctx.Req.Context(), req, proxy.proxyPath, proxy.route, proxy.ds)

			assert.Equal(t, "https://www.google.com/some/method", req.URL.String())
			assert.Equal(t, "my secret 123", req.Header.Get("x-header"))
		})

		t.Run("When matching route path and has dynamic url", func(t *testing.T) {
			ctx, req := setUp()
			proxy, err := NewDataSourceProxy(ds, plugin, ctx, "api/common/some/method", &setting.Cfg{})
			require.NoError(t, err)
			proxy.route = plugin.Routes[3]
			ApplyRoute(proxy.ctx.Req.Context(), req, proxy.proxyPath, proxy.route, proxy.ds)

			assert.Equal(t, "https://dynamic.grafana.com/some/method?apiKey=123", req.URL.String())
			assert.Equal(t, "my secret 123", req.Header.Get("x-header"))
		})

		t.Run("When matching route path with no url", func(t *testing.T) {
			ctx, req := setUp()
			proxy, err := NewDataSourceProxy(ds, plugin, ctx, "", &setting.Cfg{})
			require.NoError(t, err)
			proxy.route = plugin.Routes[4]
			ApplyRoute(proxy.ctx.Req.Context(), req, proxy.proxyPath, proxy.route, proxy.ds)

			assert.Equal(t, "http://localhost/asd", req.URL.String())
		})

		t.Run("Validating request", func(t *testing.T) {
			t.Run("plugin route with valid role", func(t *testing.T) {
				ctx, _ := setUp()
				proxy, err := NewDataSourceProxy(ds, plugin, ctx, "api/v4/some/method", &setting.Cfg{})
				require.NoError(t, err)
				err = proxy.validateRequest()
				require.NoError(t, err)
			})

			t.Run("plugin route with admin role and user is editor", func(t *testing.T) {
				ctx, _ := setUp()
				proxy, err := NewDataSourceProxy(ds, plugin, ctx, "api/admin", &setting.Cfg{})
				require.NoError(t, err)
				err = proxy.validateRequest()
				require.Error(t, err)
			})

			t.Run("plugin route with admin role and user is admin", func(t *testing.T) {
				ctx, _ := setUp()
				ctx.SignedInUser.OrgRole = models.ROLE_ADMIN
				proxy, err := NewDataSourceProxy(ds, plugin, ctx, "api/admin", &setting.Cfg{})
				require.NoError(t, err)
				err = proxy.validateRequest()
				require.NoError(t, err)
			})
		})
	})

	t.Run("Plugin with multiple routes for token auth", func(t *testing.T) {
		plugin := &plugins.DataSourcePlugin{
			Routes: []*plugins.AppPluginRoute{
				{
					Path: "pathwithtoken1",
					URL:  "https://api.nr1.io/some/path",
					TokenAuth: &plugins.JwtTokenAuth{
						Url: "https://login.server.com/{{.JsonData.tenantId}}/oauth2/token",
						Params: map[string]string{
							"grant_type":    "client_credentials",
							"client_id":     "{{.JsonData.clientId}}",
							"client_secret": "{{.SecureJsonData.clientSecret}}",
							"resource":      "https://api.nr1.io",
						},
					},
				},
				{
					Path: "pathwithtoken2",
					URL:  "https://api.nr2.io/some/path",
					TokenAuth: &plugins.JwtTokenAuth{
						Url: "https://login.server.com/{{.JsonData.tenantId}}/oauth2/token",
						Params: map[string]string{
							"grant_type":    "client_credentials",
							"client_id":     "{{.JsonData.clientId}}",
							"client_secret": "{{.SecureJsonData.clientSecret}}",
							"resource":      "https://api.nr2.io",
						},
					},
				},
			},
		}

		origSecretKey := setting.SecretKey
		t.Cleanup(func() {
			setting.SecretKey = origSecretKey
		})
		setting.SecretKey = "password"

		key, err := util.Encrypt([]byte("123"), "password")
		require.NoError(t, err)

		ds := &models.DataSource{
			JsonData: simplejson.NewFromAny(map[string]interface{}{
				"clientId": "asd",
				"tenantId": "mytenantId",
			}),
			SecureJsonData: map[string][]byte{
				"clientSecret": key,
			},
		}

		req, err := http.NewRequest("GET", "http://localhost/asd", nil)
		require.NoError(t, err)
		ctx := &models.ReqContext{
			Context: &macaron.Context{
				Req: macaron.Request{Request: req},
			},
			SignedInUser: &models.SignedInUser{OrgRole: models.ROLE_EDITOR},
		}

		t.Run("When creating and caching access tokens", func(t *testing.T) {
			var authorizationHeaderCall1 string
			var authorizationHeaderCall2 string

			t.Run("first call should add authorization header with access token", func(t *testing.T) {
				json, err := ioutil.ReadFile("./test-data/access-token-1.json")
				require.NoError(t, err)

				client = newFakeHTTPClient(t, json)
				proxy, err := NewDataSourceProxy(ds, plugin, ctx, "pathwithtoken1", &setting.Cfg{})
				require.NoError(t, err)
				ApplyRoute(proxy.ctx.Req.Context(), req, proxy.proxyPath, plugin.Routes[0], proxy.ds)

				authorizationHeaderCall1 = req.Header.Get("Authorization")
				assert.Equal(t, "https://api.nr1.io/some/path", req.URL.String())
				assert.True(t, strings.HasPrefix(authorizationHeaderCall1, "Bearer eyJ0e"))

				t.Run("second call to another route should add a different access token", func(t *testing.T) {
					json2, err := ioutil.ReadFile("./test-data/access-token-2.json")
					require.NoError(t, err)

					req, err := http.NewRequest("GET", "http://localhost/asd", nil)
					require.NoError(t, err)
					client = newFakeHTTPClient(t, json2)
					proxy, err := NewDataSourceProxy(ds, plugin, ctx, "pathwithtoken2", &setting.Cfg{})
					require.NoError(t, err)
					ApplyRoute(proxy.ctx.Req.Context(), req, proxy.proxyPath, plugin.Routes[1], proxy.ds)

					authorizationHeaderCall2 = req.Header.Get("Authorization")

					assert.Equal(t, "https://api.nr2.io/some/path", req.URL.String())
					assert.True(t, strings.HasPrefix(authorizationHeaderCall1, "Bearer eyJ0e"))
					assert.True(t, strings.HasPrefix(authorizationHeaderCall2, "Bearer eyJ0e"))
					assert.NotEqual(t, authorizationHeaderCall1, authorizationHeaderCall2)

					t.Run("third call to first route should add cached access token", func(t *testing.T) {
						req, err := http.NewRequest("GET", "http://localhost/asd", nil)
						require.NoError(t, err)

						client = newFakeHTTPClient(t, []byte{})
						proxy, err := NewDataSourceProxy(ds, plugin, ctx, "pathwithtoken1", &setting.Cfg{})
						require.NoError(t, err)
						ApplyRoute(proxy.ctx.Req.Context(), req, proxy.proxyPath, plugin.Routes[0], proxy.ds)

						authorizationHeaderCall3 := req.Header.Get("Authorization")
						assert.Equal(t, "https://api.nr1.io/some/path", req.URL.String())
						assert.True(t, strings.HasPrefix(authorizationHeaderCall1, "Bearer eyJ0e"))
						assert.True(t, strings.HasPrefix(authorizationHeaderCall3, "Bearer eyJ0e"))
						assert.Equal(t, authorizationHeaderCall1, authorizationHeaderCall3)
					})
				})
			})
		})
	})

	t.Run("When proxying graphite", func(t *testing.T) {
		origBuildVer := setting.BuildVersion
		t.Cleanup(func() {
			setting.BuildVersion = origBuildVer
		})
		setting.BuildVersion = "5.3.0"

		plugin := &plugins.DataSourcePlugin{}
		ds := &models.DataSource{Url: "htttp://graphite:8080", Type: models.DS_GRAPHITE}
		ctx := &models.ReqContext{}

		proxy, err := NewDataSourceProxy(ds, plugin, ctx, "/render", &setting.Cfg{})
		require.NoError(t, err)
		req, err := http.NewRequest(http.MethodGet, "http://grafana.com/sub", nil)
		require.NoError(t, err)

		proxy.director(req)

		t.Run("Can translate request URL and path", func(t *testing.T) {
			assert.Equal(t, "graphite:8080", req.URL.Host)
			assert.Equal(t, "/render", req.URL.Path)
			assert.Equal(t, "Grafana/5.3.0", req.Header.Get("User-Agent"))
		})
	})

	t.Run("When proxying InfluxDB", func(t *testing.T) {
		plugin := &plugins.DataSourcePlugin{}

		ds := &models.DataSource{
			Type:     models.DS_INFLUXDB_08,
			Url:      "http://influxdb:8083",
			Database: "site",
			User:     "user",
			Password: "password",
		}

		ctx := &models.ReqContext{}
		proxy, err := NewDataSourceProxy(ds, plugin, ctx, "", &setting.Cfg{})
		require.NoError(t, err)

		req, err := http.NewRequest(http.MethodGet, "http://grafana.com/sub", nil)
		require.NoError(t, err)

		proxy.director(req)
		assert.Equal(t, "/db/site/", req.URL.Path)
	})

	t.Run("When proxying a data source with no keepCookies specified", func(t *testing.T) {
		plugin := &plugins.DataSourcePlugin{}

		json, err := simplejson.NewJson([]byte(`{"keepCookies": []}`))
		require.NoError(t, err)

		ds := &models.DataSource{
			Type:     models.DS_GRAPHITE,
			Url:      "http://graphite:8086",
			JsonData: json,
		}

		ctx := &models.ReqContext{}
		proxy, err := NewDataSourceProxy(ds, plugin, ctx, "", &setting.Cfg{})
		require.NoError(t, err)

		requestURL, err := url.Parse("http://grafana.com/sub")
		require.NoError(t, err)
		req := http.Request{URL: requestURL, Header: make(http.Header)}
		cookies := "grafana_user=admin; grafana_remember=99; grafana_sess=11; JSESSION_ID=test"
		req.Header.Set("Cookie", cookies)

		proxy.director(&req)

		assert.Equal(t, "", req.Header.Get("Cookie"))
	})

	t.Run("When proxying a data source with keep cookies specified", func(t *testing.T) {
		plugin := &plugins.DataSourcePlugin{}

		json, err := simplejson.NewJson([]byte(`{"keepCookies": ["JSESSION_ID"]}`))
		require.NoError(t, err)

		ds := &models.DataSource{
			Type:     models.DS_GRAPHITE,
			Url:      "http://graphite:8086",
			JsonData: json,
		}

		ctx := &models.ReqContext{}
		proxy, err := NewDataSourceProxy(ds, plugin, ctx, "", &setting.Cfg{})
		require.NoError(t, err)

		requestURL, err := url.Parse("http://grafana.com/sub")
		require.NoError(t, err)
		req := http.Request{URL: requestURL, Header: make(http.Header)}
		cookies := "grafana_user=admin; grafana_remember=99; grafana_sess=11; JSESSION_ID=test"
		req.Header.Set("Cookie", cookies)

		proxy.director(&req)

		assert.Equal(t, "JSESSION_ID=test", req.Header.Get("Cookie"))
	})

	t.Run("When proxying a custom datasource", func(t *testing.T) {
		plugin := &plugins.DataSourcePlugin{}
		ds := &models.DataSource{
			Type: "custom-datasource",
			Url:  "http://host/root/",
		}
		ctx := &models.ReqContext{}
		proxy, err := NewDataSourceProxy(ds, plugin, ctx, "/path/to/folder/", &setting.Cfg{})
		require.NoError(t, err)
		req, err := http.NewRequest(http.MethodGet, "http://grafana.com/sub", nil)
		req.Header.Set("Origin", "grafana.com")
		req.Header.Set("Referer", "grafana.com")
		req.Header.Set("X-Canary", "stillthere")
		require.NoError(t, err)

		proxy.director(req)

		assert.Equal(t, "http://host/root/path/to/folder/", req.URL.String())

		assert.Empty(t, req.Header.Get("Origin"))
		assert.Empty(t, req.Header.Get("Referer"))
		assert.Equal(t, "stillthere", req.Header.Get("X-Canary"))
	})

	t.Run("When proxying a datasource that has OAuth token pass-through enabled", func(t *testing.T) {
		social.SocialMap["generic_oauth"] = &social.SocialGenericOAuth{
			SocialBase: &social.SocialBase{
				Config: &oauth2.Config{},
			},
		}
		origAuthSvc := setting.OAuthService
		t.Cleanup(func() {
			setting.OAuthService = origAuthSvc
		})
		setting.OAuthService = &setting.OAuther{}
		setting.OAuthService.OAuthInfos = make(map[string]*setting.OAuthInfo)
		setting.OAuthService.OAuthInfos["generic_oauth"] = &setting.OAuthInfo{}

		bus.AddHandler("test", func(query *models.GetAuthInfoQuery) error {
			query.Result = &models.UserAuth{
				Id:                1,
				UserId:            1,
				AuthModule:        "generic_oauth",
				OAuthAccessToken:  "testtoken",
				OAuthRefreshToken: "testrefreshtoken",
				OAuthTokenType:    "Bearer",
				OAuthExpiry:       time.Now().AddDate(0, 0, 1),
			}
			return nil
		})

		plugin := &plugins.DataSourcePlugin{}
		ds := &models.DataSource{
			Type: "custom-datasource",
			Url:  "http://host/root/",
			JsonData: simplejson.NewFromAny(map[string]interface{}{
				"oauthPassThru": true,
			}),
		}

		req, err := http.NewRequest("GET", "http://localhost/asd", nil)
		require.NoError(t, err)
		ctx := &models.ReqContext{
			SignedInUser: &models.SignedInUser{UserId: 1},
			Context: &macaron.Context{
				Req: macaron.Request{Request: req},
			},
		}
		proxy, err := NewDataSourceProxy(ds, plugin, ctx, "/path/to/folder/", &setting.Cfg{})
		require.NoError(t, err)
		req, err = http.NewRequest(http.MethodGet, "http://grafana.com/sub", nil)
		require.NoError(t, err)

		proxy.director(req)

		assert.Equal(t, "Bearer testtoken", req.Header.Get("Authorization"))
	})

	t.Run("When SendUserHeader config is enabled", func(t *testing.T) {
		req := getDatasourceProxiedRequest(
			t,
			&models.ReqContext{
				SignedInUser: &models.SignedInUser{
					Login: "test_user",
				},
			},
			&setting.Cfg{SendUserHeader: true},
		)
		assert.Equal(t, "test_user", req.Header.Get("X-Grafana-User"))
	})

	t.Run("When SendUserHeader config is disabled", func(t *testing.T) {
		req := getDatasourceProxiedRequest(
			t,
			&models.ReqContext{
				SignedInUser: &models.SignedInUser{
					Login: "test_user",
				},
			},
			&setting.Cfg{SendUserHeader: false},
		)
		// Get will return empty string even if header is not set
		assert.Empty(t, req.Header.Get("X-Grafana-User"))
	})

	t.Run("When SendUserHeader config is enabled but user is anonymous", func(t *testing.T) {
		req := getDatasourceProxiedRequest(
			t,
			&models.ReqContext{
				SignedInUser: &models.SignedInUser{IsAnonymous: true},
			},
			&setting.Cfg{SendUserHeader: true},
		)
		// Get will return empty string even if header is not set
		assert.Empty(t, req.Header.Get("X-Grafana-User"))
	})

	t.Run("When proxying data source proxy should handle authentication", func(t *testing.T) {
		tests := []*testCase{
			createAuthTest(t, models.DS_INFLUXDB_08, authTypePassword, authCheckQuery, false),
			createAuthTest(t, models.DS_INFLUXDB_08, authTypePassword, authCheckQuery, true),
			createAuthTest(t, models.DS_INFLUXDB, authTypePassword, authCheckHeader, true),
			createAuthTest(t, models.DS_INFLUXDB, authTypePassword, authCheckHeader, false),
			createAuthTest(t, models.DS_INFLUXDB, authTypeBasic, authCheckHeader, true),
			createAuthTest(t, models.DS_INFLUXDB, authTypeBasic, authCheckHeader, false),

			// These two should be enough for any other datasource at the moment. Proxy has special handling
			// only for Influx, others have the same path and only BasicAuth. Non BasicAuth datasources
			// do not go through proxy but through TSDB API which is not tested here.
			createAuthTest(t, models.DS_ES, authTypeBasic, authCheckHeader, false),
			createAuthTest(t, models.DS_ES, authTypeBasic, authCheckHeader, true),
		}
		for _, test := range tests {
			models.ClearDSDecryptionCache()
			runDatasourceAuthTest(t, test)
		}
	})
}

// test DataSourceProxy request handling.
func TestDataSourceProxy_requestHandling(t *testing.T) {
	var writeErr error

	plugin := &plugins.DataSourcePlugin{}

	type setUpCfg struct {
		headers map[string]string
		writeCb func(w http.ResponseWriter)
	}

	setUp := func(t *testing.T, cfgs ...setUpCfg) (*models.ReqContext, *models.DataSource) {
		writeErr = nil

		backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			http.SetCookie(w, &http.Cookie{Name: "flavor", Value: "chocolateChip"})
			written := false
			for _, cfg := range cfgs {
				if cfg.writeCb != nil {
					t.Log("Writing response via callback")
					cfg.writeCb(w)
					written = true
				}
			}
			if !written {
				t.Log("Writing default response")
				w.WriteHeader(200)
				_, writeErr = w.Write([]byte("I am the backend"))
			}
		}))
		t.Cleanup(backend.Close)

		ds := &models.DataSource{Url: backend.URL, Type: models.DS_GRAPHITE}

		responseRecorder := &closeNotifierResponseRecorder{
			ResponseRecorder: httptest.NewRecorder(),
		}
		t.Cleanup(responseRecorder.Close)

		responseWriter := macaron.NewResponseWriter("GET", responseRecorder)

		// XXX: Really unsure why, but setting headers within the HTTP handler function doesn't stick,
		// so doing it here instead
		for _, cfg := range cfgs {
			for k, v := range cfg.headers {
				responseWriter.Header().Set(k, v)
			}
		}

		return &models.ReqContext{
			SignedInUser: &models.SignedInUser{},
			Context: &macaron.Context{
				Req: macaron.Request{
					Request: httptest.NewRequest("GET", "/render", nil),
				},
				Resp: responseWriter,
			},
		}, ds
	}

	t.Run("When response header Set-Cookie is not set should remove proxied Set-Cookie header", func(t *testing.T) {
		ctx, ds := setUp(t)
		proxy, err := NewDataSourceProxy(ds, plugin, ctx, "/render", &setting.Cfg{})
		require.NoError(t, err)

		proxy.HandleRequest()

		require.NoError(t, writeErr)
		assert.Empty(t, proxy.ctx.Resp.Header().Get("Set-Cookie"))
	})

	t.Run("When response header Set-Cookie is set should remove proxied Set-Cookie header and restore the original Set-Cookie header", func(t *testing.T) {
		ctx, ds := setUp(t, setUpCfg{
			headers: map[string]string{
				"Set-Cookie": "important_cookie=important_value",
			},
		})
		proxy, err := NewDataSourceProxy(ds, plugin, ctx, "/render", &setting.Cfg{})
		require.NoError(t, err)

		proxy.HandleRequest()

		require.NoError(t, writeErr)
		assert.Equal(t, "important_cookie=important_value", proxy.ctx.Resp.Header().Get("Set-Cookie"))
	})

	t.Run("Data source returns status code 401", func(t *testing.T) {
		ctx, ds := setUp(t, setUpCfg{
			writeCb: func(w http.ResponseWriter) {
				w.WriteHeader(401)
				w.Header().Set("www-authenticate", `Basic realm="Access to the server"`)
				_, err := w.Write([]byte("Not authenticated"))
				require.NoError(t, err)
				t.Log("Wrote 401 response")
			},
		})
		proxy, err := NewDataSourceProxy(ds, plugin, ctx, "/render", &setting.Cfg{})
		require.NoError(t, err)

		proxy.HandleRequest()

		require.NoError(t, writeErr)
		assert.Equal(t, 400, proxy.ctx.Resp.Status(), "Status code 401 should be converted to 400")
		assert.Empty(t, proxy.ctx.Resp.Header().Get("www-authenticate"))
	})
}

func TestNewDataSourceProxy_InvalidURL(t *testing.T) {
	ctx := models.ReqContext{
		Context: &macaron.Context{
			Req: macaron.Request{},
		},
		SignedInUser: &models.SignedInUser{OrgRole: models.ROLE_EDITOR},
	}
	ds := models.DataSource{
		Type: "test",
		Url:  "://host/root",
	}
	cfg := setting.Cfg{}
	plugin := plugins.DataSourcePlugin{}
	_, err := NewDataSourceProxy(&ds, &plugin, &ctx, "api/method", &cfg)
	require.Error(t, err)
	assert.True(t, strings.HasPrefix(err.Error(), `validation of data source URL "://host/root" failed`))
}

func TestNewDataSourceProxy_ProtocolLessURL(t *testing.T) {
	ctx := models.ReqContext{
		Context: &macaron.Context{
			Req: macaron.Request{},
		},
		SignedInUser: &models.SignedInUser{OrgRole: models.ROLE_EDITOR},
	}
	ds := models.DataSource{
		Type: "test",
		Url:  "127.0.01:5432",
	}
	cfg := setting.Cfg{}
	plugin := plugins.DataSourcePlugin{}

	_, err := NewDataSourceProxy(&ds, &plugin, &ctx, "api/method", &cfg)

	require.NoError(t, err)
}

// Test wth MSSQL type data sources.
func TestNewDataSourceProxy_MSSQL(t *testing.T) {
	ctx := models.ReqContext{
		Context: &macaron.Context{
			Req: macaron.Request{},
		},
		SignedInUser: &models.SignedInUser{OrgRole: models.ROLE_EDITOR},
	}
	tcs := []struct {
		description string
		url         string
		err         error
	}{
		{
			description: "Valid ODBC URL",
			url:         `localhost\instance:1433`,
		},
		{
			description: "Invalid ODBC URL",
			url:         `localhost\instance::1433`,
			err: datasource.URLValidationError{
				Err: fmt.Errorf(`unrecognized MSSQL URL format: "localhost\\instance::1433"`),
				URL: `localhost\instance::1433`,
			},
		},
	}
	for _, tc := range tcs {
		t.Run(tc.description, func(t *testing.T) {
			cfg := setting.Cfg{}
			plugin := plugins.DataSourcePlugin{}
			ds := models.DataSource{
				Type: "mssql",
				Url:  tc.url,
			}

			p, err := NewDataSourceProxy(&ds, &plugin, &ctx, "api/method", &cfg)
			if tc.err == nil {
				require.NoError(t, err)
				assert.Equal(t, &url.URL{
					Scheme: "sqlserver",
					Host:   ds.Url,
				}, p.targetUrl)
			} else {
				require.Error(t, err)
				assert.Equal(t, tc.err, err)
			}
		})
	}
}

type closeNotifierResponseRecorder struct {
	*httptest.ResponseRecorder
	closeChan chan bool
}

func (r *closeNotifierResponseRecorder) CloseNotify() <-chan bool {
	r.closeChan = make(chan bool)
	return r.closeChan
}

func (r *closeNotifierResponseRecorder) Close() {
	close(r.closeChan)
}

// getDatasourceProxiedRequest is a helper for easier setup of tests based on global config and ReqContext.
func getDatasourceProxiedRequest(t *testing.T, ctx *models.ReqContext, cfg *setting.Cfg) *http.Request {
	plugin := &plugins.DataSourcePlugin{}

	ds := &models.DataSource{
		Type: "custom",
		Url:  "http://host/root/",
	}

	proxy, err := NewDataSourceProxy(ds, plugin, ctx, "", cfg)
	require.NoError(t, err)
	req, err := http.NewRequest(http.MethodGet, "http://grafana.com/sub", nil)
	require.NoError(t, err)

	proxy.director(req)
	return req
}

type httpClientStub struct {
	t        *testing.T
	fakeBody []byte
}

func (c *httpClientStub) Do(req *http.Request) (*http.Response, error) {
	bodyJSON, err := simplejson.NewJson(c.fakeBody)
	require.NoError(c.t, err)
	_, passedTokenCacheTest := bodyJSON.CheckGet("expires_on")
	require.True(c.t, passedTokenCacheTest)

	bodyJSON.Set("expires_on", fmt.Sprint(time.Now().Add(time.Second*60).Unix()))
	body, err := bodyJSON.MarshalJSON()
	require.NoError(c.t, err)
	resp := &http.Response{
		Body: ioutil.NopCloser(bytes.NewReader(body)),
	}

	return resp, nil
}

func newFakeHTTPClient(t *testing.T, fakeBody []byte) httpClient {
	return &httpClientStub{
		t:        t,
		fakeBody: fakeBody,
	}
}

type testCase struct {
	datasource *models.DataSource
	checkReq   func(req *http.Request)
}

const (
	authTypePassword = "password"
	authTypeBasic    = "basic"
)

const (
	authCheckQuery  = "query"
	authCheckHeader = "header"
)

func createAuthTest(t *testing.T, dsType string, authType string, authCheck string, useSecureJsonData bool) *testCase {
	// Basic user:password
	base64AuthHeader := "Basic dXNlcjpwYXNzd29yZA=="

	test := &testCase{
		datasource: &models.DataSource{
			Type:     dsType,
			JsonData: simplejson.New(),
		},
	}
	var message string
	if authType == authTypePassword {
		message = fmt.Sprintf("%v should add username and password", dsType)
		test.datasource.User = "user"
		if useSecureJsonData {
			test.datasource.SecureJsonData = securejsondata.GetEncryptedJsonData(map[string]string{
				"password": "password",
			})
		} else {
			test.datasource.Password = "password"
		}
	} else {
		message = fmt.Sprintf("%v should add basic auth username and password", dsType)
		test.datasource.BasicAuth = true
		test.datasource.BasicAuthUser = "user"
		if useSecureJsonData {
			test.datasource.SecureJsonData = securejsondata.GetEncryptedJsonData(map[string]string{
				"basicAuthPassword": "password",
			})
		} else {
			test.datasource.BasicAuthPassword = "password"
		}
	}

	if useSecureJsonData {
		message += " from securejsondata"
	}

	if authCheck == authCheckQuery {
		message += " to query params"
		test.checkReq = func(req *http.Request) {
			queryVals := req.URL.Query()
			assert.Equal(t, "user", queryVals["u"][0], message)
			assert.Equal(t, "password", queryVals["p"][0], message)
		}
	} else {
		message += " to auth header"
		test.checkReq = func(req *http.Request) {
			assert.Equal(t, base64AuthHeader, req.Header.Get("Authorization"), message)
		}
	}

	return test
}

func runDatasourceAuthTest(t *testing.T, test *testCase) {
	plugin := &plugins.DataSourcePlugin{}
	ctx := &models.ReqContext{}
	proxy, err := NewDataSourceProxy(test.datasource, plugin, ctx, "", &setting.Cfg{})
	require.NoError(t, err)

	req, err := http.NewRequest(http.MethodGet, "http://grafana.com/sub", nil)
	require.NoError(t, err)

	proxy.director(req)

	test.checkReq(req)
}
