Generate oauth2 config from login SSO service metadata

go.mod

@@ -6,11 +6,14 @@ require (
 	github.com/1f349/violet v0.0.10
 	github.com/MrMelon54/exit-reload v0.0.1
 	github.com/MrMelon54/mjwt v0.1.1
+	github.com/go-oauth2/oauth2/v4 v4.5.2
 	github.com/google/subcommands v1.2.0
 	github.com/julienschmidt/httprouter v1.3.0
 )
 
 require (
 	github.com/golang-jwt/jwt/v4 v4.5.0 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,18 +1,153 @@
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issuer/sso.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"golang.org/x/oauth2"
 	"net/http"
 	"net/url"
 	"path"
@@ -15,6 +16,11 @@ import (
 type SsoConfig struct {
 	Addr      string `json:"addr"`      // https://login.example.com
 	Namespace string `json:"namespace"` // example.com
+	Client    struct {
+		ID     string   `json:"id"`
+		Secret string   `json:"secret"`
+		Scopes []string `json:"scopes"`
+	} `json:"client"`
 }
 
 func (s SsoConfig) FetchConfig() (*WellKnownOIDC, error) {
@@ -75,3 +81,16 @@ func (o WellKnownOIDC) Validate() error {
 	// oidc valid
 	return nil
 }
+
+func (o WellKnownOIDC) Oauth2Config() oauth2.Config {
+	return oauth2.Config{
+		ClientID:     o.Config.Client.ID,
+		ClientSecret: o.Config.Client.Secret,
+		Endpoint: oauth2.Endpoint{
+			AuthURL:   o.AuthorizationEndpoint,
+			TokenURL:  o.TokenEndpoint,
+			AuthStyle: oauth2.AuthStyleInHeader,
+		},
+		Scopes: o.Config.Client.Scopes,
+	}
+}

server/flow.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	_ "embed"
+	"github.com/google/uuid"
 	"github.com/julienschmidt/httprouter"
 	"html/template"
 	"log"
@@ -39,11 +40,21 @@ func (h *HttpServer) flowPopupPost(rw http.ResponseWriter, req *http.Request, pa
 		return
 	}
 
-	login.AuthorizationEndpoint
+	// TODO: save state in sync.Map for quick lookup later
+	state := login.Config.Namespace + "%" + uuid.NewString()
 
-	// https://github.com/go-oauth2/oauth2/blob/master/example/client/client.go
+	oa2conf := login.Oauth2Config()
+	oa2conf.RedirectURL = h.baseUrl + "/callback"
+	nextUrl := oa2conf.AuthCodeURL(state)
+	http.Redirect(rw, req, nextUrl, http.StatusFound)
 }
 
 func (h *HttpServer) flowCallback(rw http.ResponseWriter, req *http.Request, params httprouter.Params) {
+	err := req.ParseForm()
+	if err != nil {
+		http.Error(rw, "Error parsing form", http.StatusBadRequest)
+		return
+	}
 
+	// TODO: process flow callback, parse incoming state
 }

server/server.go

@@ -19,6 +19,14 @@ type HttpServer struct {
 func NewHttpServer(listen, baseUrl string, manager *issuer.Manager, signer mjwt.Signer) *http.Server {
 	r := httprouter.New()
 
+	// remove last slash from baseUrl
+	{
+		l := len(baseUrl)
+		if baseUrl[l-1] == '/' {
+			baseUrl = baseUrl[:l-1]
+		}
+	}
+
 	hs := &HttpServer{
 		r:       r,
 		baseUrl: baseUrl,