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router.go
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router.go
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package web
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/fs"
"math"
"net/http"
"net/http/pprof"
"net/url"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/Depado/ginprom"
helmet "github.com/danielkov/gin-helmet"
"github.com/gin-contrib/cors"
"github.com/gin-contrib/expvar"
"github.com/gin-contrib/sessions"
"github.com/gin-contrib/sessions/cookie"
limits "github.com/gin-contrib/size"
"github.com/gin-gonic/gin"
"github.com/graph-gophers/graphql-go"
"github.com/graph-gophers/graphql-go/relay"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/ulule/limiter/v3"
mgin "github.com/ulule/limiter/v3/drivers/middleware/gin"
"github.com/ulule/limiter/v3/drivers/store/memory"
"github.com/unrolled/secure"
"github.com/smartcontractkit/chainlink/v2/core/build"
"github.com/smartcontractkit/chainlink/v2/core/logger"
"github.com/smartcontractkit/chainlink/v2/core/services/chainlink"
"github.com/smartcontractkit/chainlink/v2/core/web/auth"
"github.com/smartcontractkit/chainlink/v2/core/web/loader"
"github.com/smartcontractkit/chainlink/v2/core/web/resolver"
"github.com/smartcontractkit/chainlink/v2/core/web/schema"
)
// NewRouter returns *gin.Engine router that listens and responds to requests to the node for valid paths.
func NewRouter(app chainlink.Application, prometheus *ginprom.Prometheus) (*gin.Engine, error) {
engine := gin.New()
engine.RemoteIPHeaders = nil // don't trust default headers: "X-Forwarded-For", "X-Real-IP"
config := app.GetConfig()
secret, err := app.SecretGenerator().Generate(config.RootDir())
if err != nil {
return nil, err
}
sessionStore := cookie.NewStore(secret)
sessionStore.Options(config.WebServer().SessionOptions())
cors := uiCorsHandler(config.WebServer().AllowOrigins())
if prometheus != nil {
prometheusUse(prometheus, engine, promhttp.HandlerOpts{EnableOpenMetrics: true})
}
tls := config.WebServer().TLS()
engine.Use(
limits.RequestSizeLimiter(config.WebServer().HTTPMaxSize()),
loggerFunc(app.GetLogger()),
gin.Recovery(),
cors,
secureMiddleware(tls.ForceRedirect(), tls.Host(), config.Insecure().DevWebServer()),
)
if prometheus != nil {
engine.Use(prometheus.Instrument())
}
engine.Use(helmet.Default())
rl := config.WebServer().RateLimit()
api := engine.Group(
"/",
rateLimiter(
rl.AuthenticatedPeriod(),
rl.Authenticated(),
),
sessions.Sessions(auth.SessionName, sessionStore),
)
debugRoutes(app, api)
healthRoutes(app, api)
sessionRoutes(app, api)
v2Routes(app, api)
loopRoutes(app, api)
guiAssetRoutes(engine, config.Insecure().DisableRateLimiting(), app.GetLogger())
api.POST("/query",
auth.AuthenticateGQL(app.SessionORM(), app.GetLogger().Named("GQLHandler")),
loader.Middleware(app),
graphqlHandler(app),
)
return engine, nil
}
// Defining the Graphql handler
func graphqlHandler(app chainlink.Application) gin.HandlerFunc {
rootSchema := schema.MustGetRootSchema()
// Disable introspection and set a max query depth in production.
var schemaOpts []graphql.SchemaOpt
if !app.GetConfig().Insecure().InfiniteDepthQueries() {
schemaOpts = append(schemaOpts,
graphql.MaxDepth(10),
)
}
schema := graphql.MustParseSchema(rootSchema,
&resolver.Resolver{
App: app,
},
schemaOpts...,
)
h := relay.Handler{Schema: schema}
return func(c *gin.Context) {
h.ServeHTTP(c.Writer, c.Request)
}
}
func rateLimiter(period time.Duration, limit int64) gin.HandlerFunc {
store := memory.NewStore()
rate := limiter.Rate{
Period: period,
Limit: limit,
}
return mgin.NewMiddleware(limiter.New(store, rate))
}
// secureOptions configure security options for the secure middleware, mostly
// for TLS redirection
func secureOptions(tlsRedirect bool, tlsHost string, devWebServer bool) secure.Options {
return secure.Options{
FrameDeny: true,
IsDevelopment: devWebServer,
SSLRedirect: tlsRedirect,
SSLHost: tlsHost,
}
}
// secureMiddleware adds a TLS handler and redirector, to button up security
// for this node
func secureMiddleware(tlsRedirect bool, tlsHost string, devWebServer bool) gin.HandlerFunc {
secureMiddleware := secure.New(secureOptions(tlsRedirect, tlsHost, devWebServer))
secureFunc := func() gin.HandlerFunc {
return func(c *gin.Context) {
err := secureMiddleware.Process(c.Writer, c.Request)
// If there was an error, do not continue.
if err != nil {
c.Abort()
return
}
// Avoid header rewrite if response is a redirection.
if status := c.Writer.Status(); status > 300 && status < 399 {
c.Abort()
}
}
}()
return secureFunc
}
func debugRoutes(app chainlink.Application, r *gin.RouterGroup) {
group := r.Group("/debug", auth.Authenticate(app.SessionORM(), auth.AuthenticateBySession))
group.GET("/vars", expvar.Handler())
}
func metricRoutes(r *gin.RouterGroup, includeHeap bool) {
pprofGroup := r.Group("/debug/pprof")
pprofGroup.GET("/", ginHandlerFromHTTP(pprof.Index))
pprofGroup.GET("/cmdline", ginHandlerFromHTTP(pprof.Cmdline))
pprofGroup.GET("/profile", ginHandlerFromHTTP(pprof.Profile))
pprofGroup.POST("/symbol", ginHandlerFromHTTP(pprof.Symbol))
pprofGroup.GET("/symbol", ginHandlerFromHTTP(pprof.Symbol))
pprofGroup.GET("/trace", ginHandlerFromHTTP(pprof.Trace))
pprofGroup.GET("/allocs", ginHandlerFromHTTP(pprof.Handler("allocs").ServeHTTP))
pprofGroup.GET("/block", ginHandlerFromHTTP(pprof.Handler("block").ServeHTTP))
pprofGroup.GET("/goroutine", ginHandlerFromHTTP(pprof.Handler("goroutine").ServeHTTP))
if includeHeap {
pprofGroup.GET("/heap", ginHandlerFromHTTP(pprof.Handler("heap").ServeHTTP))
}
pprofGroup.GET("/mutex", ginHandlerFromHTTP(pprof.Handler("mutex").ServeHTTP))
pprofGroup.GET("/threadcreate", ginHandlerFromHTTP(pprof.Handler("threadcreate").ServeHTTP))
}
func ginHandlerFromHTTP(h http.HandlerFunc) gin.HandlerFunc {
return func(c *gin.Context) {
h.ServeHTTP(c.Writer, c.Request)
}
}
func sessionRoutes(app chainlink.Application, r *gin.RouterGroup) {
config := app.GetConfig()
rl := config.WebServer().RateLimit()
unauth := r.Group("/", rateLimiter(
rl.UnauthenticatedPeriod(),
rl.Unauthenticated(),
))
sc := NewSessionsController(app)
unauth.POST("/sessions", sc.Create)
auth := r.Group("/", auth.Authenticate(app.SessionORM(), auth.AuthenticateBySession))
auth.DELETE("/sessions", sc.Destroy)
}
func healthRoutes(app chainlink.Application, r *gin.RouterGroup) {
hc := HealthController{app}
r.GET("/readyz", hc.Readyz)
r.GET("/health", hc.Health)
}
func loopRoutes(app chainlink.Application, r *gin.RouterGroup) {
loopRegistry := NewLoopRegistryServer(app)
r.GET("/discovery", ginHandlerFromHTTP(loopRegistry.discoveryHandler))
r.GET("/plugins/:name/metrics", loopRegistry.pluginMetricHandler)
}
func v2Routes(app chainlink.Application, r *gin.RouterGroup) {
unauthedv2 := r.Group("/v2")
prc := PipelineRunsController{app}
psec := PipelineJobSpecErrorsController{app}
unauthedv2.PATCH("/resume/:runID", prc.Resume)
authv2 := r.Group("/v2", auth.Authenticate(app.SessionORM(),
auth.AuthenticateByToken,
auth.AuthenticateBySession,
))
{
uc := UserController{app}
authv2.GET("/users", auth.RequiresAdminRole(uc.Index))
authv2.POST("/users", auth.RequiresAdminRole(uc.Create))
authv2.PATCH("/users", auth.RequiresAdminRole(uc.UpdateRole))
authv2.DELETE("/users/:email", auth.RequiresAdminRole(uc.Delete))
authv2.PATCH("/user/password", uc.UpdatePassword)
authv2.POST("/user/token", uc.NewAPIToken)
authv2.POST("/user/token/delete", uc.DeleteAPIToken)
wa := NewWebAuthnController(app)
authv2.GET("/enroll_webauthn", wa.BeginRegistration)
authv2.POST("/enroll_webauthn", wa.FinishRegistration)
eia := ExternalInitiatorsController{app}
authv2.GET("/external_initiators", paginatedRequest(eia.Index))
authv2.POST("/external_initiators", auth.RequiresEditRole(eia.Create))
authv2.DELETE("/external_initiators/:Name", auth.RequiresEditRole(eia.Destroy))
bt := BridgeTypesController{app}
authv2.GET("/bridge_types", paginatedRequest(bt.Index))
authv2.POST("/bridge_types", auth.RequiresEditRole(bt.Create))
authv2.GET("/bridge_types/:BridgeName", bt.Show)
authv2.PATCH("/bridge_types/:BridgeName", auth.RequiresEditRole(bt.Update))
authv2.DELETE("/bridge_types/:BridgeName", auth.RequiresEditRole(bt.Destroy))
ets := EVMTransfersController{app}
authv2.POST("/transfers", auth.RequiresAdminRole(ets.Create))
authv2.POST("/transfers/evm", auth.RequiresAdminRole(ets.Create))
tts := CosmosTransfersController{app}
authv2.POST("/transfers/cosmos", auth.RequiresAdminRole(tts.Create))
sts := SolanaTransfersController{app}
authv2.POST("/transfers/solana", auth.RequiresAdminRole(sts.Create))
cc := ConfigController{app}
authv2.GET("/config", cc.Show)
authv2.GET("/config/v2", cc.Show)
tas := TxAttemptsController{app}
authv2.GET("/tx_attempts", paginatedRequest(tas.Index))
authv2.GET("/tx_attempts/evm", paginatedRequest(tas.Index))
txs := TransactionsController{app}
authv2.GET("/transactions/evm", paginatedRequest(txs.Index))
authv2.GET("/transactions/evm/:TxHash", txs.Show)
authv2.GET("/transactions", paginatedRequest(txs.Index))
authv2.GET("/transactions/:TxHash", txs.Show)
rc := ReplayController{app}
authv2.POST("/replay_from_block/:number", auth.RequiresRunRole(rc.ReplayFromBlock))
csakc := CSAKeysController{app}
authv2.GET("/keys/csa", csakc.Index)
authv2.POST("/keys/csa", auth.RequiresEditRole(csakc.Create))
authv2.POST("/keys/csa/import", auth.RequiresAdminRole(csakc.Import))
authv2.POST("/keys/csa/export/:ID", auth.RequiresAdminRole(csakc.Export))
ekc := NewETHKeysController(app)
authv2.GET("/keys/eth", ekc.Index)
authv2.POST("/keys/eth", auth.RequiresEditRole(ekc.Create))
authv2.DELETE("/keys/eth/:keyID", auth.RequiresAdminRole(ekc.Delete))
authv2.POST("/keys/eth/import", auth.RequiresAdminRole(ekc.Import))
authv2.POST("/keys/eth/export/:address", auth.RequiresAdminRole(ekc.Export))
// duplicated from above, with `evm` instead of `eth`
// legacy ones remain for backwards compatibility
ethKeysGroup := authv2.Group("", auth.Authenticate(app.SessionORM(),
auth.AuthenticateByToken,
auth.AuthenticateBySession,
))
ethKeysGroup.Use(ekc.formatETHKeyResponse())
authv2.GET("/keys/evm", ekc.Index)
ethKeysGroup.POST("/keys/evm", auth.RequiresEditRole(ekc.Create))
ethKeysGroup.DELETE("/keys/evm/:address", auth.RequiresAdminRole(ekc.Delete))
ethKeysGroup.POST("/keys/evm/import", auth.RequiresAdminRole(ekc.Import))
authv2.POST("/keys/evm/export/:address", auth.RequiresAdminRole(ekc.Export))
ethKeysGroup.POST("/keys/evm/chain", auth.RequiresAdminRole(ekc.Chain))
ocrkc := OCRKeysController{app}
authv2.GET("/keys/ocr", ocrkc.Index)
authv2.POST("/keys/ocr", auth.RequiresEditRole(ocrkc.Create))
authv2.DELETE("/keys/ocr/:keyID", auth.RequiresAdminRole(ocrkc.Delete))
authv2.POST("/keys/ocr/import", auth.RequiresAdminRole(ocrkc.Import))
authv2.POST("/keys/ocr/export/:ID", auth.RequiresAdminRole(ocrkc.Export))
ocr2kc := OCR2KeysController{app}
authv2.GET("/keys/ocr2", ocr2kc.Index)
authv2.POST("/keys/ocr2/:chainType", auth.RequiresEditRole(ocr2kc.Create))
authv2.DELETE("/keys/ocr2/:keyID", auth.RequiresAdminRole(ocr2kc.Delete))
authv2.POST("/keys/ocr2/import", auth.RequiresAdminRole(ocr2kc.Import))
authv2.POST("/keys/ocr2/export/:ID", auth.RequiresAdminRole(ocr2kc.Export))
p2pkc := P2PKeysController{app}
authv2.GET("/keys/p2p", p2pkc.Index)
authv2.POST("/keys/p2p", auth.RequiresEditRole(p2pkc.Create))
authv2.DELETE("/keys/p2p/:keyID", auth.RequiresAdminRole(p2pkc.Delete))
authv2.POST("/keys/p2p/import", auth.RequiresAdminRole(p2pkc.Import))
authv2.POST("/keys/p2p/export/:ID", auth.RequiresAdminRole(p2pkc.Export))
for _, keys := range []struct {
path string
kc KeysController
}{
{"solana", NewSolanaKeysController(app)},
{"cosmos", NewCosmosKeysController(app)},
{"starknet", NewStarkNetKeysController(app)},
{"dkgsign", NewDKGSignKeysController(app)},
{"dkgencrypt", NewDKGEncryptKeysController(app)},
} {
authv2.GET("/keys/"+keys.path, keys.kc.Index)
authv2.POST("/keys/"+keys.path, auth.RequiresEditRole(keys.kc.Create))
authv2.DELETE("/keys/"+keys.path+"/:keyID", auth.RequiresAdminRole(keys.kc.Delete))
authv2.POST("/keys/"+keys.path+"/import", auth.RequiresAdminRole(keys.kc.Import))
authv2.POST("/keys/"+keys.path+"/export/:ID", auth.RequiresAdminRole(keys.kc.Export))
}
vrfkc := VRFKeysController{app}
authv2.GET("/keys/vrf", vrfkc.Index)
authv2.POST("/keys/vrf", auth.RequiresEditRole(vrfkc.Create))
authv2.DELETE("/keys/vrf/:keyID", auth.RequiresAdminRole(vrfkc.Delete))
authv2.POST("/keys/vrf/import", auth.RequiresAdminRole(vrfkc.Import))
authv2.POST("/keys/vrf/export/:keyID", auth.RequiresAdminRole(vrfkc.Export))
jc := JobsController{app}
authv2.GET("/jobs", paginatedRequest(jc.Index))
authv2.GET("/jobs/:ID", jc.Show)
authv2.POST("/jobs", auth.RequiresEditRole(jc.Create))
authv2.PUT("/jobs/:ID", auth.RequiresEditRole(jc.Update))
authv2.DELETE("/jobs/:ID", auth.RequiresEditRole(jc.Delete))
// PipelineRunsController
authv2.GET("/pipeline/runs", paginatedRequest(prc.Index))
authv2.GET("/jobs/:ID/runs", paginatedRequest(prc.Index))
authv2.GET("/jobs/:ID/runs/:runID", prc.Show)
// FeaturesController
fc := FeaturesController{app}
authv2.GET("/features", fc.Index)
// PipelineJobSpecErrorsController
authv2.DELETE("/pipeline/job_spec_errors/:ID", auth.RequiresEditRole(psec.Destroy))
lgc := LogController{app}
authv2.GET("/log", lgc.Get)
authv2.PATCH("/log", auth.RequiresAdminRole(lgc.Patch))
chains := authv2.Group("chains")
for _, chain := range []struct {
path string
cc ChainsController
}{
{"evm", NewEVMChainsController(app)},
{"solana", NewSolanaChainsController(app)},
{"starknet", NewStarkNetChainsController(app)},
{"cosmos", NewCosmosChainsController(app)},
} {
chains.GET(chain.path, paginatedRequest(chain.cc.Index))
chains.GET(chain.path+"/:ID", chain.cc.Show)
}
nodes := authv2.Group("nodes")
for _, chain := range []struct {
path string
nc NodesController
}{
{"evm", NewEVMNodesController(app)},
{"solana", NewSolanaNodesController(app)},
{"starknet", NewStarkNetNodesController(app)},
{"cosmos", NewCosmosNodesController(app)},
} {
if chain.path == "evm" {
// TODO still EVM only https://app.shortcut.com/chainlinklabs/story/26276/multi-chain-type-ui-node-chain-configuration
nodes.GET("", paginatedRequest(chain.nc.Index))
}
nodes.GET(chain.path, paginatedRequest(chain.nc.Index))
chains.GET(chain.path+"/:ID/nodes", paginatedRequest(chain.nc.Index))
}
efc := EVMForwardersController{app}
authv2.GET("/nodes/evm/forwarders", paginatedRequest(efc.Index))
authv2.POST("/nodes/evm/forwarders/track", auth.RequiresEditRole(efc.Track))
authv2.DELETE("/nodes/evm/forwarders/:fwdID", auth.RequiresEditRole(efc.Delete))
buildInfo := BuildInfoController{app}
authv2.GET("/build_info", buildInfo.Show)
// Debug routes accessible via authentication
metricRoutes(authv2, build.IsDev())
}
ping := PingController{app}
userOrEI := r.Group("/v2", auth.Authenticate(app.SessionORM(),
auth.AuthenticateExternalInitiator,
auth.AuthenticateByToken,
auth.AuthenticateBySession,
))
userOrEI.GET("/ping", ping.Show)
userOrEI.POST("/jobs/:ID/runs", auth.RequiresRunRole(prc.Create))
}
// This is higher because it serves main.js and any static images. There are
// 5 assets which must be served, so this allows for 20 requests/min
var staticAssetsRateLimit = int64(100)
var staticAssetsRateLimitPeriod = 1 * time.Minute
var indexRateLimit = int64(20)
var indexRateLimitPeriod = 1 * time.Minute
// guiAssetRoutes serves the operator UI static files and index.html. Rate
// limiting is disabled when in dev mode.
func guiAssetRoutes(engine *gin.Engine, rateLimitingDisabled bool, lggr logger.SugaredLogger) {
// Serve static files
var assetsRouterHandlers []gin.HandlerFunc
if !rateLimitingDisabled {
assetsRouterHandlers = append(assetsRouterHandlers, rateLimiter(
staticAssetsRateLimitPeriod,
staticAssetsRateLimit,
))
}
assetsRouterHandlers = append(
assetsRouterHandlers,
ServeGzippedAssets("/assets", assetFs, lggr),
)
// Get Operator UI Assets
//
// We have to use a route here because a RouterGroup only runs middlewares
// when a route matches exactly. See https://github.com/gin-gonic/gin/issues/531
engine.GET("/assets/:file", assetsRouterHandlers...)
// Serve the index HTML file unless it is an api path
var noRouteHandlers []gin.HandlerFunc
if !rateLimitingDisabled {
noRouteHandlers = append(noRouteHandlers, rateLimiter(
indexRateLimitPeriod,
indexRateLimit,
))
}
noRouteHandlers = append(noRouteHandlers, func(c *gin.Context) {
path := c.Request.URL.Path
// Return a 404 if the path is an unmatched API path
if match, _ := regexp.MatchString(`^/v[0-9]+/.*`, path); match {
c.AbortWithStatus(http.StatusNotFound)
return
}
// Return a 404 for unknown extensions
if filepath.Ext(path) != "" {
c.AbortWithStatus(http.StatusNotFound)
return
}
// Render the React index page for any other unknown requests
file, err := assetFs.Open("index.html")
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
c.AbortWithStatus(http.StatusNotFound)
} else {
lggr.Errorf("failed to open static file '%s': %+v", path, err)
c.AbortWithStatus(http.StatusInternalServerError)
}
return
}
defer lggr.ErrorIfFn(file.Close, "Error closing file")
http.ServeContent(c.Writer, c.Request, path, time.Time{}, file)
})
engine.NoRoute(noRouteHandlers...)
}
// Inspired by https://github.com/gin-gonic/gin/issues/961
func loggerFunc(lggr logger.Logger) gin.HandlerFunc {
return func(c *gin.Context) {
buf, err := io.ReadAll(c.Request.Body)
if err != nil {
lggr.Error("Web request log error: ", err.Error())
// Implicitly relies on limits.RequestSizeLimiter
// overriding of c.Request.Body to abort gin's Context
// inside io.ReadAll.
// Functions as we would like, but horrible from an architecture
// and design pattern perspective.
if !c.IsAborted() {
c.AbortWithStatus(http.StatusBadRequest)
}
return
}
rdr := bytes.NewBuffer(buf)
c.Request.Body = io.NopCloser(bytes.NewBuffer(buf))
start := time.Now()
c.Next()
end := time.Now()
lggr.Debugw(fmt.Sprintf("%s %s", c.Request.Method, c.Request.URL.Path),
"method", c.Request.Method,
"status", c.Writer.Status(),
"path", c.Request.URL.Path,
"query", redact(c.Request.URL.Query()),
"body", readBody(rdr, lggr),
"clientIP", c.ClientIP(),
"errors", c.Errors.String(),
"servedAt", end.Format("2006-01-02 15:04:05"),
"latency", fmt.Sprintf("%v", end.Sub(start)),
)
}
}
// Add CORS headers so UI can make api requests
func uiCorsHandler(ao string) gin.HandlerFunc {
c := cors.Config{
AllowMethods: []string{"GET", "POST", "PATCH", "DELETE"},
AllowHeaders: []string{"Origin", "Content-Type", "Accept"},
ExposeHeaders: []string{"Content-Length"},
AllowCredentials: true,
MaxAge: math.MaxInt32,
}
if ao == "*" {
c.AllowAllOrigins = true
} else if allowOrigins := strings.Split(ao, ","); len(allowOrigins) > 0 {
c.AllowOrigins = allowOrigins
}
return cors.New(c)
}
func readBody(reader io.Reader, lggr logger.Logger) string {
buf := new(bytes.Buffer)
_, err := buf.ReadFrom(reader)
if err != nil {
lggr.Warn("unable to read from body for sanitization: ", err)
return "*FAILED TO READ BODY*"
}
if buf.Len() == 0 {
return ""
}
s, err := readSanitizedJSON(buf)
if err != nil {
lggr.Warn("unable to sanitize json for logging: ", err)
return "*FAILED TO READ BODY*"
}
return s
}
func readSanitizedJSON(buf *bytes.Buffer) (string, error) {
var dst map[string]interface{}
err := json.Unmarshal(buf.Bytes(), &dst)
if err != nil {
return "", err
}
cleaned := map[string]interface{}{}
for k, v := range dst {
if isBlacklisted(k) {
cleaned[k] = "*REDACTED*"
continue
}
cleaned[k] = v
}
b, err := json.Marshal(cleaned)
if err != nil {
return "", err
}
return string(b), err
}
func redact(values url.Values) string {
cleaned := url.Values{}
for k, v := range values {
if isBlacklisted(k) {
cleaned[k] = []string{"REDACTED"}
continue
}
cleaned[k] = v
}
return cleaned.Encode()
}
// NOTE: keys must be in lowercase for case insensitive match
var blacklist = map[string]struct{}{
"password": {},
"newpassword": {},
"oldpassword": {},
"current_password": {},
"new_account_password": {},
}
func isBlacklisted(k string) bool {
lk := strings.ToLower(k)
if _, ok := blacklist[lk]; ok || strings.Contains(lk, "password") {
return true
}
return false
}
// prometheusUse is adapted from ginprom.Prometheus.Use
// until merged upstream: https://github.com/Depado/ginprom/pull/48
func prometheusUse(p *ginprom.Prometheus, e *gin.Engine, handlerOpts promhttp.HandlerOpts) {
var (
r prometheus.Registerer = p.Registry
g prometheus.Gatherer = p.Registry
)
if p.Registry == nil {
r = prometheus.DefaultRegisterer
g = prometheus.DefaultGatherer
}
h := promhttp.InstrumentMetricHandler(r, promhttp.HandlerFor(g, handlerOpts))
e.GET(p.MetricsPath, prometheusHandler(p.Token, h))
p.Engine = e
}
// use is adapted from ginprom.prometheusHandler to add support for custom http.Handler
func prometheusHandler(token string, h http.Handler) gin.HandlerFunc {
return func(c *gin.Context) {
if token == "" {
h.ServeHTTP(c.Writer, c.Request)
return
}
header := c.Request.Header.Get("Authorization")
if header == "" {
c.String(http.StatusUnauthorized, ginprom.ErrInvalidToken.Error())
return
}
bearer := fmt.Sprintf("Bearer %s", token)
if header != bearer {
c.String(http.StatusUnauthorized, ginprom.ErrInvalidToken.Error())
return
}
h.ServeHTTP(c.Writer, c.Request)
}
}