├── .gitignore ├── README.md ├── cmd └── poc-go-oauth2 │ └── main.go ├── config.example ├── go.mod ├── go.sum ├── internal ├── configs │ └── inits.go ├── helpers │ └── pages │ │ └── html.go ├── logger │ └── logger.go └── services │ ├── common.go │ ├── facebook.go │ └── google.go └── output └── .gitkeep /.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.exe~ 4 | *.dll 5 | *.so 6 | *.dylib 7 | 8 | # Test binary, build with `go test -c` 9 | *.test 10 | 11 | # Output of the go coverage tool, specifically when used with LiteIDE 12 | *.out 13 | 14 | vendor/ 15 | config.yml 16 | output/logger.log 17 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # POC-GO-OAUTH2 2 | 3 | A POC Project on How to implement OAuth2 in GO -------------------------------------------------------------------------------- /cmd/poc-go-oauth2/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "log" 5 | "net/http" 6 | 7 | "github.com/BNPrashanth/poc-go-oauth2/internal/configs" 8 | "github.com/BNPrashanth/poc-go-oauth2/internal/logger" 9 | "github.com/BNPrashanth/poc-go-oauth2/internal/services" 10 | 11 | "github.com/spf13/viper" 12 | ) 13 | 14 | func main() { 15 | // Initialize Viper across the application 16 | configs.InitializeViper() 17 | 18 | // Initialize Logger across the application 19 | logger.InitializeZapCustomLogger() 20 | 21 | // Initialize Oauth2 Services 22 | services.InitializeOAuthFacebook() 23 | services.InitializeOAuthGoogle() 24 | 25 | // Routes for the application 26 | http.HandleFunc("/", services.HandleMain) 27 | http.HandleFunc("/login-fb", services.HandleFacebookLogin) 28 | http.HandleFunc("/callback-fb", services.CallBackFromFacebook) 29 | http.HandleFunc("/login-gl", services.HandleGoogleLogin) 30 | http.HandleFunc("/callback-gl", services.CallBackFromGoogle) 31 | 32 | logger.Log.Info("Started running on http://localhost:" + viper.GetString("port")) 33 | log.Fatal(http.ListenAndServe(":"+viper.GetString("port"), nil)) 34 | } 35 | -------------------------------------------------------------------------------- /config.example: -------------------------------------------------------------------------------- 1 | port: 9090 2 | logger-output-path: "path to log file" 3 | 4 | oauthStateString: "thisshouldberandom" 5 | google: 6 | clientID: "google client id" 7 | clientSecret: "google client secret" 8 | facebook: 9 | clientID: "facebook client id" 10 | clientSecret: "facebook client secret" 11 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/BNPrashanth/poc-go-oauth2 2 | 3 | go 1.12 4 | 5 | require ( 6 | github.com/pkg/errors v0.8.1 // indirect 7 | github.com/spf13/viper v1.4.0 8 | go.uber.org/zap v1.10.0 9 | golang.org/x/oauth2 v0.0.0-20190523182746-aaccbc9213b0 10 | ) 11 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 2 | cloud.google.com/go v0.34.0 h1:eOI3/cP2VTU6uZLDYAoic+eyzzB9YyGmJ7eIjl8rOPg= 3 | cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 4 | github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ= 5 | github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 6 | github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= 7 | github.com/alecthomas/template 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h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs= 97 | github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U= 98 | github.com/ugorji/go v1.1.4/go.mod h1:uQMGLiO92mf5W77hV/PUCpI3pbzQx3CRekS0kk+RGrc= 99 | github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU= 100 | github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q= 101 | go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU= 102 | go.uber.org/atomic v1.4.0 h1:cxzIVoETapQEqDhQu3QfnvXAV4AlzcvUCxkVUFw3+EU= 103 | go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE= 104 | go.uber.org/multierr v1.1.0 h1:HoEmRHQPVSqub6w2z2d2EOVs2fjyFRGyofhKuyDq0QI= 105 | go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0= 106 | go.uber.org/zap v1.10.0 h1:ORx85nbTijNz8ljznvCMR1ZBIPKFn3jQrag10X2AsuM= 107 | go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q= 108 | golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4= 109 | golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= 110 | golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE= 111 | golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc= 112 | golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 113 | golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 114 | golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 115 | golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 116 | golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 117 | golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 118 | golang.org/x/net v0.0.0-20190522155817-f3200d17e092 h1:4QSRKanuywn15aTZvI/mIDEgPQpswuFndXpOj3rKEco= 119 | golang.org/x/net v0.0.0-20190522155817-f3200d17e092/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks= 120 | golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be h1:vEDujvNQGv4jgYKudGeI/+DAX4Jffq6hpD55MmoEvKs= 121 | golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U= 122 | golang.org/x/oauth2 v0.0.0-20190523182746-aaccbc9213b0 h1:xFEXbcD0oa/xhqQmMXztdZ0bWvexAWds+8c1gRN8nu0= 123 | golang.org/x/oauth2 v0.0.0-20190523182746-aaccbc9213b0/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw= 124 | golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 125 | golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 126 | golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 127 | golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 128 | golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 129 | golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 130 | golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 131 | golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU= 132 | golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 133 | golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg= 134 | golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= 135 | golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= 136 | golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= 137 | golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= 138 | golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs= 139 | google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM= 140 | google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508= 141 | google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4= 142 | google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc= 143 | google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c= 144 | google.golang.org/grpc v1.21.0 h1:G+97AoqBnmZIT91cLG/EkCoK9NSelj64P8bOHHNmGn0= 145 | google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM= 146 | gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw= 147 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 148 | gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY= 149 | gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 150 | gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo= 151 | gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74= 152 | gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 153 | gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw= 154 | gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 155 | honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 156 | -------------------------------------------------------------------------------- /internal/configs/inits.go: -------------------------------------------------------------------------------- 1 | package configs 2 | 3 | import ( 4 | "fmt" 5 | 6 | "github.com/spf13/viper" 7 | ) 8 | 9 | /* 10 | InitializeViper Function initializes viper to read config.yml file and environment variables in the application. 11 | */ 12 | func InitializeViper() { 13 | // Set the file name of the configurations file 14 | viper.SetConfigName("config") 15 | 16 | // Set the path to look for the configurations file 17 | viper.AddConfigPath(".") 18 | 19 | // Enable VIPER to read Environment Variables 20 | viper.AutomaticEnv() 21 | 22 | viper.SetConfigType("yml") 23 | if err := viper.ReadInConfig(); err != nil { 24 | fmt.Printf("Error reading config file, %s", err) 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /internal/helpers/pages/html.go: -------------------------------------------------------------------------------- 1 | package pages 2 | 3 | /* 4 | IndexPage renders the html content for the index page. 5 | */ 6 | const IndexPage = ` 7 | 8 | 9 | OAuth-2 Test 10 | 11 | 12 |

OAuth-2 Test

13 |

14 | Login with the following, 15 |

16 | 20 | 21 | 22 | ` 23 | -------------------------------------------------------------------------------- /internal/logger/logger.go: -------------------------------------------------------------------------------- 1 | package logger 2 | 3 | import ( 4 | "github.com/spf13/viper" 5 | "go.uber.org/zap" 6 | "go.uber.org/zap/zapcore" 7 | ) 8 | 9 | var ( 10 | // Log variable is a globally accessible variable which will be initialized when the InitializeZapCustomLogger function is executed successfully. 11 | Log *zap.Logger 12 | ) 13 | 14 | /* 15 | InitializeZapCustomLogger Funtion initializes a logger using uber-go/zap package in the application. 16 | */ 17 | func InitializeZapCustomLogger() { 18 | conf := zap.Config{ 19 | Encoding: "json", 20 | Level: zap.NewAtomicLevelAt(zapcore.InfoLevel), 21 | OutputPaths: []string{viper.GetString("logger-output-path"), "stdout"}, 22 | EncoderConfig: zapcore.EncoderConfig{ 23 | LevelKey: "level", 24 | TimeKey: "time", 25 | CallerKey: "file", 26 | MessageKey: "msg", 27 | EncodeLevel: zapcore.LowercaseLevelEncoder, 28 | EncodeTime: zapcore.ISO8601TimeEncoder, 29 | EncodeCaller: zapcore.ShortCallerEncoder, 30 | }, 31 | } 32 | Log, _ = conf.Build() 33 | } 34 | -------------------------------------------------------------------------------- /internal/services/common.go: -------------------------------------------------------------------------------- 1 | package services 2 | 3 | import ( 4 | "net/http" 5 | "net/url" 6 | "strings" 7 | 8 | "github.com/BNPrashanth/poc-go-oauth2/internal/helpers/pages" 9 | "github.com/BNPrashanth/poc-go-oauth2/internal/logger" 10 | "golang.org/x/oauth2" 11 | ) 12 | 13 | /* 14 | HandleMain Function renders the index page when the application index route is called 15 | */ 16 | func HandleMain(w http.ResponseWriter, r *http.Request) { 17 | w.Header().Set("Content-Type", "text/html; charset=utf-8") 18 | w.WriteHeader(http.StatusOK) 19 | w.Write([]byte(pages.IndexPage)) 20 | } 21 | 22 | /* 23 | HandleLogin Function 24 | */ 25 | func HandleLogin(w http.ResponseWriter, r *http.Request, oauthConf *oauth2.Config, oauthStateString string) { 26 | URL, err := url.Parse(oauthConf.Endpoint.AuthURL) 27 | if err != nil { 28 | logger.Log.Error("Parse: " + err.Error()) 29 | } 30 | logger.Log.Info(URL.String()) 31 | parameters := url.Values{} 32 | parameters.Add("client_id", oauthConf.ClientID) 33 | parameters.Add("scope", strings.Join(oauthConf.Scopes, " ")) 34 | parameters.Add("redirect_uri", oauthConf.RedirectURL) 35 | parameters.Add("response_type", "code") 36 | parameters.Add("state", oauthStateString) 37 | URL.RawQuery = parameters.Encode() 38 | url := URL.String() 39 | logger.Log.Info(url) 40 | http.Redirect(w, r, url, http.StatusTemporaryRedirect) 41 | } 42 | -------------------------------------------------------------------------------- /internal/services/facebook.go: -------------------------------------------------------------------------------- 1 | package services 2 | 3 | import ( 4 | "io/ioutil" 5 | "net/http" 6 | "net/url" 7 | 8 | "github.com/BNPrashanth/poc-go-oauth2/internal/logger" 9 | 10 | "github.com/spf13/viper" 11 | "golang.org/x/oauth2" 12 | "golang.org/x/oauth2/facebook" 13 | ) 14 | 15 | var ( 16 | oauthConfFb = &oauth2.Config{ 17 | ClientID: "", 18 | ClientSecret: "", 19 | RedirectURL: "http://localhost:9090/callback-fb", 20 | Scopes: []string{"public_profile"}, 21 | Endpoint: facebook.Endpoint, 22 | } 23 | oauthStateStringFb = "" 24 | ) 25 | 26 | /* 27 | InitializeOAuthFacebook Function 28 | */ 29 | func InitializeOAuthFacebook() { 30 | oauthConfFb.ClientID = viper.GetString("facebook.clientID") 31 | oauthConfFb.ClientSecret = viper.GetString("facebook.clientSecret") 32 | oauthStateStringFb = viper.GetString("oauthStateString") 33 | } 34 | 35 | /* 36 | HandleFacebookLogin Function 37 | */ 38 | func HandleFacebookLogin(w http.ResponseWriter, r *http.Request) { 39 | HandleLogin(w, r, oauthConfFb, oauthStateStringFb) 40 | } 41 | 42 | /* 43 | CallBackFromFacebook Function 44 | */ 45 | func CallBackFromFacebook(w http.ResponseWriter, r *http.Request) { 46 | logger.Log.Info("Callback-fb..") 47 | 48 | state := r.FormValue("state") 49 | logger.Log.Info(state) 50 | if state != oauthStateStringFb { 51 | logger.Log.Info("invalid oauth state, expected " + oauthStateStringFb + ", got " + state + "\n") 52 | http.Redirect(w, r, "/", http.StatusTemporaryRedirect) 53 | return 54 | } 55 | 56 | code := r.FormValue("code") 57 | logger.Log.Info(code) 58 | 59 | if code == "" { 60 | logger.Log.Warn("Code not found..") 61 | w.Write([]byte("Code Not Found to provide AccessToken..\n")) 62 | reason := r.FormValue("error_reason") 63 | if reason == "user_denied" { 64 | w.Write([]byte("User has denied Permission..")) 65 | } 66 | // User has denied access.. 67 | // http.Redirect(w, r, "/", http.StatusTemporaryRedirect) 68 | } else { 69 | token, err := oauthConfFb.Exchange(oauth2.NoContext, code) 70 | if err != nil { 71 | logger.Log.Error("oauthConfFb.Exchange() failed with " + err.Error() + "\n") 72 | return 73 | } 74 | logger.Log.Info("TOKEN>> AccessToken>> " + token.AccessToken) 75 | logger.Log.Info("TOKEN>> Expiration Time>> " + token.Expiry.String()) 76 | logger.Log.Info("TOKEN>> RefreshToken>> " + token.RefreshToken) 77 | 78 | logger.Log.Info("https://graph.facebook.com/me?access_token=" + url.QueryEscape(token.AccessToken) + "&fields=email") 79 | resp, err := http.Get("https://graph.facebook.com/me?access_token=" + 80 | url.QueryEscape(token.AccessToken) + "&fields=email") 81 | if err != nil { 82 | logger.Log.Error("Get: " + err.Error() + "\n") 83 | http.Redirect(w, r, "/", http.StatusTemporaryRedirect) 84 | return 85 | } 86 | defer resp.Body.Close() 87 | 88 | response, err := ioutil.ReadAll(resp.Body) 89 | if err != nil { 90 | logger.Log.Error("ReadAll: " + err.Error() + "\n") 91 | http.Redirect(w, r, "/", http.StatusTemporaryRedirect) 92 | return 93 | } 94 | 95 | logger.Log.Info("parseResponseBody: " + string(response) + "\n") 96 | 97 | w.Write([]byte("Hello, I'm protected\n")) 98 | w.Write([]byte(string(response))) 99 | return 100 | } 101 | } 102 | -------------------------------------------------------------------------------- /internal/services/google.go: -------------------------------------------------------------------------------- 1 | package services 2 | 3 | import ( 4 | "io/ioutil" 5 | "net/http" 6 | "net/url" 7 | 8 | "github.com/BNPrashanth/poc-go-oauth2/internal/logger" 9 | 10 | "github.com/spf13/viper" 11 | "golang.org/x/oauth2" 12 | "golang.org/x/oauth2/google" 13 | ) 14 | 15 | var ( 16 | oauthConfGl = &oauth2.Config{ 17 | ClientID: "", 18 | ClientSecret: "", 19 | RedirectURL: "http://localhost:9090/callback-gl", 20 | Scopes: []string{"https://www.googleapis.com/auth/userinfo.email"}, 21 | Endpoint: google.Endpoint, 22 | } 23 | oauthStateStringGl = "" 24 | ) 25 | 26 | /* 27 | InitializeOAuthGoogle Function 28 | */ 29 | func InitializeOAuthGoogle() { 30 | oauthConfGl.ClientID = viper.GetString("google.clientID") 31 | oauthConfGl.ClientSecret = viper.GetString("google.clientSecret") 32 | oauthStateStringGl = viper.GetString("oauthStateString") 33 | } 34 | 35 | /* 36 | HandleGoogleLogin Function 37 | */ 38 | func HandleGoogleLogin(w http.ResponseWriter, r *http.Request) { 39 | HandleLogin(w, r, oauthConfGl, oauthStateStringGl) 40 | } 41 | 42 | /* 43 | CallBackFromGoogle Function 44 | */ 45 | func CallBackFromGoogle(w http.ResponseWriter, r *http.Request) { 46 | logger.Log.Info("Callback-gl..") 47 | 48 | state := r.FormValue("state") 49 | logger.Log.Info(state) 50 | if state != oauthStateStringGl { 51 | logger.Log.Info("invalid oauth state, expected " + oauthStateStringGl + ", got " + state + "\n") 52 | http.Redirect(w, r, "/", http.StatusTemporaryRedirect) 53 | return 54 | } 55 | 56 | code := r.FormValue("code") 57 | logger.Log.Info(code) 58 | 59 | if code == "" { 60 | logger.Log.Warn("Code not found..") 61 | w.Write([]byte("Code Not Found to provide AccessToken..\n")) 62 | reason := r.FormValue("error_reason") 63 | if reason == "user_denied" { 64 | w.Write([]byte("User has denied Permission..")) 65 | } 66 | // User has denied access.. 67 | // http.Redirect(w, r, "/", http.StatusTemporaryRedirect) 68 | } else { 69 | token, err := oauthConfGl.Exchange(oauth2.NoContext, code) 70 | if err != nil { 71 | logger.Log.Error("oauthConfGl.Exchange() failed with " + err.Error() + "\n") 72 | return 73 | } 74 | logger.Log.Info("TOKEN>> AccessToken>> " + token.AccessToken) 75 | logger.Log.Info("TOKEN>> Expiration Time>> " + token.Expiry.String()) 76 | logger.Log.Info("TOKEN>> RefreshToken>> " + token.RefreshToken) 77 | 78 | resp, err := http.Get("https://www.googleapis.com/oauth2/v2/userinfo?access_token=" + url.QueryEscape(token.AccessToken)) 79 | if err != nil { 80 | logger.Log.Error("Get: " + err.Error() + "\n") 81 | http.Redirect(w, r, "/", http.StatusTemporaryRedirect) 82 | return 83 | } 84 | defer resp.Body.Close() 85 | 86 | response, err := ioutil.ReadAll(resp.Body) 87 | if err != nil { 88 | logger.Log.Error("ReadAll: " + err.Error() + "\n") 89 | http.Redirect(w, r, "/", http.StatusTemporaryRedirect) 90 | return 91 | } 92 | 93 | logger.Log.Info("parseResponseBody: " + string(response) + "\n") 94 | 95 | w.Write([]byte("Hello, I'm protected\n")) 96 | w.Write([]byte(string(response))) 97 | return 98 | } 99 | } 100 | -------------------------------------------------------------------------------- /output/.gitkeep: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/BNPrashanth/poc-go-oauth2/74e1494b28377188c0a6b6cbd3401c3013588c7e/output/.gitkeep --------------------------------------------------------------------------------