[ChaosCenter]: Migrating graphql-server from Gorilla mux to Gin (#3923)

* Migrate from Gorilla mux to Gin

Signed-off-by: Namkyu Park <lak9348@gmail.com>
Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* Linting & Ordering codes

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: remove duplicated code

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: adopt go fmt

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* Move to using interface for better mocking at chaoshub package (#3933)

* fix: Move to using interface for better mocking at chaoshub

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: delete operator interface and linting codes

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: change db instance to local variable

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: passing operator interface for better mocking

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

---------

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: status code to constant variable

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: add logs when encounterd error

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: rename pkg name

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: rename pkg, graphql_server to rest_handlers

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: resolve codeql issue

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

* fix: add replacer value

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

---------

Signed-off-by: Namkyu Park <lak9348@gmail.com>
Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

litmus-portal/graphql-server/go.mod

@@ -6,11 +6,12 @@ require (
 	github.com/99designs/gqlgen v0.11.3
 	github.com/argoproj/argo-workflows/v3 v3.3.1
 	github.com/ghodss/yaml v1.0.1-0.20190212211648-25d852aebe32
+	github.com/gin-contrib/cors v1.3.1
+	github.com/gin-gonic/gin v1.7.7
 	github.com/go-git/go-git/v5 v5.4.2
 	github.com/golang-jwt/jwt v3.2.2+incompatible
 	github.com/golang/protobuf v1.5.2
 	github.com/google/uuid v1.3.0
-	github.com/gorilla/mux v1.8.0
 	github.com/gorilla/websocket v1.5.0
 	github.com/jinzhu/copier v0.3.5
 	github.com/kelseyhightower/envconfig v1.4.0
@@ -20,7 +21,6 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.12.1
 	github.com/prometheus/common v0.32.1
-	github.com/rs/cors v1.8.2
 	github.com/sirupsen/logrus v1.8.1
 	github.com/tidwall/gjson v1.14.0
 	github.com/tidwall/sjson v1.2.4

litmus-portal/graphql-server/go.sum

@@ -550,6 +550,13 @@ github.com/ghodss/yaml v0.0.0-20150909031657-73d445a93680/go.mod h1:4dBDuWmgqj2H
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/ghodss/yaml v1.0.1-0.20190212211648-25d852aebe32 h1:Mn26/9ZMNWSw9C9ERFA1PUxfmGpolnw2v0bKOREu5ew=
 github.com/ghodss/yaml v1.0.1-0.20190212211648-25d852aebe32/go.mod h1:GIjDIg/heH5DOkXY3YJ/wNhfHsQHoXGjl8G8amsYQ1I=
+github.com/gin-contrib/cors v1.3.1 h1:doAsuITavI4IOcd0Y19U4B+O0dNWihRyX//nn4sEmgA=
+github.com/gin-contrib/cors v1.3.1/go.mod h1:jjEJ4268OPZUcU7k9Pm653S7lXUGcqMADzFA61xsmDk=
+github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
+github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
+github.com/gin-gonic/gin v1.5.0/go.mod h1:Nd6IXA8m5kNZdNEHMBd93KT+mdY3+bewLgRvmCsR2Do=
+github.com/gin-gonic/gin v1.7.7 h1:3DoBmSbJbZAWqXJC3SLjAPfutPJJRN1U5pALB7EeTTs=
+github.com/gin-gonic/gin v1.7.7/go.mod h1:axIBovoeJpVj8S3BwE0uPMTeReE4+AfFtqpqaZ1qq1U=
 github.com/gizak/termui/v3 v3.1.0/go.mod h1:bXQEBkJpzxUAKf0+xq9MSWAvWZlE7c+aidmyFlkYTrY=
 github.com/gliderlabs/ssh v0.1.1/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
 github.com/gliderlabs/ssh v0.2.2 h1:6zsha5zo/TWhRhwqCD3+EarCAgZ2yN28ipRnGPnwkI0=
@@ -716,6 +723,16 @@ github.com/go-openapi/validate v0.19.15/go.mod h1:tbn/fdOwYHgrhPBzidZfJC2MIVvs9G
 github.com/go-openapi/validate v0.20.1/go.mod h1:b60iJT+xNNLfaQJUqLI7946tYiFEOuE9E4k54HpKcJ0=
 github.com/go-openapi/validate v0.20.3/go.mod h1:goDdqVGiigM3jChcrYJxD2joalke3ZXeftD16byIjA4=
 github.com/go-ozzo/ozzo-validation v3.5.0+incompatible/go.mod h1:gsEKFIVnabGBt6mXmxK0MoFy+cZoTJY6mu5Ll3LVLBU=
+github.com/go-playground/assert/v2 v2.0.1 h1:MsBgLAaY856+nPRTKrp3/OZK38U/wa0CcBYNjji3q3A=
+github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
+github.com/go-playground/locales v0.12.1/go.mod h1:IUMDtCfWo/w/mtMfIE/IG2K+Ey3ygWanZIBtBW0W2TM=
+github.com/go-playground/locales v0.13.0 h1:HyWk6mgj5qFqCT5fjGBuRArbVDfE4hi8+e8ceBS/t7Q=
+github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8=
+github.com/go-playground/universal-translator v0.16.0/go.mod h1:1AnU7NaIRDWWzGEKwgtJRd2xk99HeFyHw3yid4rvQIY=
+github.com/go-playground/universal-translator v0.17.0 h1:icxd5fm+REJzpZx7ZfpaD876Lmtgy7VtROAbHHXk8no=
+github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+Scu5vgOQjsIJAF8j9muTVoKLVtA=
+github.com/go-playground/validator/v10 v10.4.1 h1:pH2c5ADXtd66mxoE0Zm9SUhxE20r7aM3F26W0hOn+GE=
+github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn9GlaMV7XkbRSipzJ0Ii4=
 github.com/go-redis/redis v6.15.9+incompatible/go.mod h1:NAIEuMOZ/fxfXJIrKDQDz8wamY7mA7PouImQ2Jvg6kA=
 github.com/go-resty/resty/v2 v2.7.0/go.mod h1:9PWDzw47qPphMRFfhsyk0NnSgvluHcljSMVIq3w7q0I=
 github.com/go-sql-driver/mysql v1.4.0/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
@@ -962,7 +979,6 @@ github.com/gorilla/mux v1.7.0/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2z
 github.com/gorilla/mux v1.7.1/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/mux v1.7.2/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
-github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/gorilla/securecookie v1.1.1/go.mod h1:ra0sb63/xPlUeL+yeDciTfxMRAA+MP+HVt/4epWDjd4=
 github.com/gorilla/sessions v1.2.1/go.mod h1:dk2InVEVJ0sfLlnXv9EAgkf6ecYs/i80K/zI+bUmuGM=
@@ -1204,6 +1220,9 @@ github.com/labstack/gommon v0.2.7/go.mod h1:/tj9csK2iPSBvn+3NLM9e52usepMtrd5ilFY
 github.com/lann/builder v0.0.0-20180802200727-47ae307949d0/go.mod h1:dXGbAdH5GtBTC4WfIxhKZfyBF/HBFgRZSWwZ9g/He9o=
 github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0/go.mod h1:vmVJ0l/dxyfGW6FmdpVm2joNMFikkuWg0EoCKLGUMNw=
 github.com/leanovate/gopter v0.2.4/go.mod h1:gNcbPWNEWRe4lm+bycKqxUYoH5uoVje5SkOJ3uoLer8=
+github.com/leodido/go-urn v1.1.0/go.mod h1:+cyI34gQWZcE1eQU7NVgKkkzdXDQHr1dBMtdAPozLkw=
+github.com/leodido/go-urn v1.2.0 h1:hpXL4XnriNwQ/ABnpepYM/1vCLWNDfUNts8dX3xTG6Y=
+github.com/leodido/go-urn v1.2.0/go.mod h1:+8+nEpDfqqsY+g338gtMEUOtuK+4dEMhiQEgxpxOKII=
 github.com/lib/pq v1.0.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/lib/pq v1.3.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
@@ -1276,6 +1295,7 @@ github.com/mattn/go-isatty v0.0.9/go.mod h1:YNRxwqDuOph6SZLI9vUUz6OYw3QyUt7WiY2y
 github.com/mattn/go-isatty v0.0.10/go.mod h1:qgIWMr58cqv1PHHyhnkY9lrL7etaEgOFcMEpPG5Rm84=
 github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
 github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
 github.com/mattn/go-runewidth v0.0.2/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mattn/go-runewidth v0.0.3/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
@@ -1604,8 +1624,6 @@ github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTE
 github.com/rogpeppe/go-internal v1.8.1 h1:geMPLpDpQOgVyCg5z5GoRwLHepNdb71NXb67XFkP+Eg=
 github.com/rogpeppe/go-internal v1.8.1/go.mod h1:JeRgkft04UBgHMgCIwADu4Pn6Mtm5d4nPKWu0nJ5d+o=
 github.com/rs/cors v1.6.0/go.mod h1:gFx+x8UowdsKA9AchylcLynDq+nNFfI8FkUZdN/jGCU=
-github.com/rs/cors v1.8.2 h1:KCooALfAYGs415Cwu5ABvv9n9509fSiG5SQJn/AQo4U=
-github.com/rs/cors v1.8.2/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU=
 github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
 github.com/rubenv/sql-migrate v0.0.0-20191025130928-9355dd04f4b3/go.mod h1:WS0rl9eEliYI8DPnr3TOwz4439pay+qNgzJoVya/DmY=
 github.com/rubenv/sql-migrate v0.0.0-20200212082348-64f95ea68aa3/go.mod h1:rtQlpHw+eR6UrqaS3kX1VYeaCxzCVdimDS7g5Ln4pPc=
@@ -1755,7 +1773,11 @@ github.com/uber/jaeger-client-go v2.30.0+incompatible/go.mod h1:WVhlPFC8FDjOFMMW
 github.com/uber/jaeger-lib v2.2.0+incompatible/go.mod h1:ComeNDZlWwrWnDv8aPp0Ba6+uUTzImX/AauajbLI56U=
 github.com/uber/jaeger-lib v2.4.1+incompatible/go.mod h1:ComeNDZlWwrWnDv8aPp0Ba6+uUTzImX/AauajbLI56U=
 github.com/ugorji/go v1.1.4/go.mod h1:uQMGLiO92mf5W77hV/PUCpI3pbzQx3CRekS0kk+RGrc=
+github.com/ugorji/go v1.1.7 h1:/68gy2h+1mWMrwZFeD1kQialdSzAb432dtpeJ42ovdo=
+github.com/ugorji/go v1.1.7/go.mod h1:kZn38zHttfInRq0xu/PH0az30d+z6vm202qpg1oXVMw=
 github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
+github.com/ugorji/go/codec v1.1.7 h1:2SvQaVZ1ouYrrKKwoSk2pzd4A9evlKJb9oTL+OaLUSs=
+github.com/ugorji/go/codec v1.1.7/go.mod h1:Ax+UKWsSmolVDwsd+7N3ZtXu+yMGCf907BLYF3GoBXY=
 github.com/ultraware/funlen v0.0.1/go.mod h1:Dp4UiAus7Wdb9KUZsYWZEWiRzGuM2kXM1lPbfaF6xhA=
 github.com/ultraware/funlen v0.0.2/go.mod h1:Dp4UiAus7Wdb9KUZsYWZEWiRzGuM2kXM1lPbfaF6xhA=
 github.com/urfave/cli v0.0.0-20171014202726-7bc6a0acffa5/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
@@ -2642,6 +2664,8 @@ gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMy
 gopkg.in/fsnotify/fsnotify.v1 v1.4.7/go.mod h1:Fyux9zXlo4rWoMSIzpn9fDAYjalPqJ/K1qJ27s+7ltE=
 gopkg.in/gcfg.v1 v1.2.0/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
 gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2/go.mod h1:Xk6kEKp8OKb+X14hQBKWaSkCsqBpgog8nAV2xsGOxlo=
+gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
+gopkg.in/go-playground/validator.v9 v9.29.1/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
 gopkg.in/go-playground/webhooks.v5 v5.17.0/go.mod h1:LZbya/qLVdbqDR1aKrGuWV6qbia2zCYSR5dpom2SInQ=
 gopkg.in/gorp.v1 v1.7.2/go.mod h1:Wo3h+DBQZIxATwftsglhdD/62zRFPhGhTiu5jUJmCaw=
 gopkg.in/imdario/mergo.v0 v0.3.7/go.mod h1:9qPP6AGrlC1G2PTNXko614FwGZvorN7MiBU0Eppok+U=

litmus-portal/graphql-server/pkg/authorization/middleware.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"net/http"
 
+	"github.com/gin-gonic/gin"
 	"github.com/sirupsen/logrus"
 )
 
@@ -15,50 +16,51 @@ const (
 	CookieName = "litmus-cc-token"
 )
 
-func Middleware(handler http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+// Middleware verifies jwt and checks if user has enough privilege to access route (no roles' info needed)
+func Middleware(handler http.Handler) gin.HandlerFunc {
+	return func(c *gin.Context) {
 		jwt := ""
-		auth, err := r.Cookie(CookieName)
+		auth, err := c.Request.Cookie(CookieName)
 		if err == nil {
 			jwt = auth.Value
-		} else if r.Header.Get("Authorization") != "" {
-			jwt = r.Header.Get("Authorization")
+		} else if c.Request.Header.Get("Authorization") != "" {
+			jwt = c.Request.Header.Get("Authorization")
 		}
 
-		ctx := context.WithValue(r.Context(), AuthKey, jwt)
-		r = r.WithContext(ctx)
-		handler.ServeHTTP(w, r)
-	})
+		ctx := context.WithValue(c.Request.Context(), AuthKey, jwt)
+		c.Request = c.Request.WithContext(ctx)
+		handler.ServeHTTP(c.Writer, c.Request)
+	}
 }
 
 // RestMiddlewareWithRole verifies jwt and checks if user has enough privilege to access route
-func RestMiddlewareWithRole(handler http.Handler, roles []string) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+func RestMiddlewareWithRole(handler gin.HandlerFunc, roles []string) gin.HandlerFunc {
+	return func(c *gin.Context) {
 		jwt := ""
-		auth, err := r.Cookie(CookieName)
+		auth, err := c.Request.Cookie(CookieName)
 		if err == nil {
 			jwt = auth.Value
-		} else if r.Header.Get("Authorization") != "" {
-			jwt = r.Header.Get("Authorization")
+		} else if c.Request.Header.Get("Authorization") != "" {
+			jwt = c.Request.Header.Get("Authorization")
 		}
 		user, err := UserValidateJWT(jwt)
 		if err != nil {
 			logrus.WithError(err).Error("Invalid Auth Cookie")
-			w.WriteHeader(http.StatusUnauthorized)
-			w.Write([]byte("Error verifying JWT token: " + err.Error()))
+			c.Writer.WriteHeader(http.StatusUnauthorized)
+			c.Writer.Write([]byte("Error verifying JWT token: " + err.Error()))
 			return
 		}
 		if len(roles) == 0 {
-			handler.ServeHTTP(w, r)
+			handler(c)
 			return
 		}
 		for _, role := range roles {
 			if role == user["role"] {
-				handler.ServeHTTP(w, r)
+				handler(c)
 				return
 			}
 		}
-		w.WriteHeader(http.StatusUnauthorized)
+		c.Writer.WriteHeader(http.StatusUnauthorized)
 		return
-	})
+	}
 }

litmus-portal/graphql-server/pkg/chaos-workflow/ops/operations.go

@@ -289,7 +289,7 @@ func ProcessCompletedWorkflowRun(execData types.ExecutionData, wfID string) (typ
 			if value.ChaosExp == nil {
 				continue
 			}
-			for expName, _ := range weightMap {
+			for expName := range weightMap {
 				if strings.Contains(value.ChaosExp.EngineName, expName) {
 					experimentName = expName
 				}

litmus-portal/graphql-server/pkg/chaoshub/service.go

@@ -12,8 +12,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/gin-gonic/gin"
 	"github.com/google/uuid"
-	"github.com/gorilla/mux"
 	"github.com/jinzhu/copier"
 	"github.com/litmuschaos/litmus/litmus-portal/graphql-server/graph/model"
 	"github.com/litmuschaos/litmus/litmus-portal/graphql-server/pkg/chaoshub/handler"
@@ -529,31 +529,35 @@ func (c *chaosHubService) GetAllHubs(ctx context.Context) ([]*model.ChaosHub, er
 }
 
 // GetIconHandler ...
-var GetIconHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-	vars := mux.Vars(r)
-	var img *os.File
-	var err error
-	var responseStatusCode int
-	if strings.ToLower(vars["ChartName"]) == "predefined" {
-		img, err = os.Open("/tmp/version/" + vars["ProjectID"] + "/" + vars["HubName"] + "/workflows/icons/" + vars["IconName"])
-		responseStatusCode = 200
-		if err != nil {
-			responseStatusCode = 500
-			fmt.Fprint(w, "icon cannot be fetched, err : "+err.Error())
-		}
+var GetIconHandler = gin.HandlerFunc(func(c *gin.Context) {
+	replacer := strings.NewReplacer("../", "", "./", "", "/", "", "..", "")
+	var (
+		projectID          = replacer.Replace(c.Param("ProjectID"))
+		hubName            = replacer.Replace(c.Param("HubName"))
+		chartName          = replacer.Replace(c.Param("ChartName"))
+		iconName           = replacer.Replace(c.Param("IconName"))
+		img                *os.File
+		err                error
+		responseStatusCode = http.StatusOK
+	)
+
+	if strings.ToLower(chartName) == "predefined" {
+		img, err = os.Open("/tmp/version/" + projectID + "/" + hubName + "/workflows/icons/" + iconName)
 	} else {
-		img, err = os.Open("/tmp/version/" + vars["ProjectID"] + "/" + vars["HubName"] + "/charts/" + vars["ChartName"] + "/icons/" + vars["IconName"])
-		responseStatusCode = 200
-		if err != nil {
-			responseStatusCode = 500
-			fmt.Fprint(w, "icon cannot be fetched, err : "+err.Error())
-		}
+		img, err = os.Open("/tmp/version/" + projectID + "/" + hubName + "/charts/" + chartName + "/icons/" + iconName)
 	}
+
+	if err != nil {
+		responseStatusCode = http.StatusInternalServerError
+		fmt.Fprint(c.Writer, "icon cannot be fetched, err : "+err.Error())
+	}
+
 	defer img.Close()
-	w.Header().Set("Access-Control-Allow-Origin", "*")
-	w.WriteHeader(responseStatusCode)
-	w.Header().Set("Content-Type", "image/png") // <-- set the content-type header
-	io.Copy(w, img)
+
+	c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
+	c.Writer.WriteHeader(responseStatusCode)
+	c.Writer.Header().Set("Content-Type", "image/png") // <-- set the content-type header
+	io.Copy(c.Writer, img)
 })
 
 // RecurringHubSync is used for syncing

litmus-portal/graphql-server/pkg/gitops/handler/handler.go

@@ -1,4 +1,4 @@
-// GQL handlers and other external functions to facilitate gitops
+// GQL graphql_server and other external functions to facilitate gitops
 package handler
 
 import (