Add basic service to read/verify a JWT from a GitLab pipeline

.github/workflows/github-release.yml

@@ -0,0 +1,31 @@
+name: Create release
+on:
+  pull_request_target:
+    branches:
+      - main
+    types:
+      - closed
+permissions:
+  contents: write
+  actions: write
+jobs:
+  release:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: install autotag binary
+        run: curl -sL https://git.io/autotag-install | sudo sh -s -- -b /usr/bin
+      - name: create release
+        run: |-
+          TAG=$(autotag)
+          git tag $TAG
+          git push origin $TAG
+          gh release create $TAG
+          gh workflow run goreleaser.yml --ref $TAG
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+

.github/workflows/goreleaser.yml

@@ -0,0 +1,33 @@
+name: goreleaser
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - "*"
+
+permissions:
+  contents: write
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      -
+        name: Set up Go
+        uses: actions/setup-go@v3
+      -
+        name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v4
+        with:
+          distribution: goreleaser
+          version: latest
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+

.github/workflows/lint-test.yml

@@ -0,0 +1,21 @@
+name: lint-test
+on: [push]
+permissions:
+  contents: read
+
+jobs:
+  lint-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v4
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: v1.54
+      - name: Install dependencies
+        run: go get .
+      - name: Build
+        run: go build -v ./...
+      - name: Test with the Go CLI
+        run: go test -v ./...

.gitignore

@@ -0,0 +1 @@
+rollout

.golangci.yml

@@ -0,0 +1,4 @@
+linters:
+  enable:
+    - gofmt
+

.goreleaser.yml

@@ -0,0 +1,37 @@
+before:
+  hooks:
+    - go mod tidy
+builds:
+  - binary: rollout
+    env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+
+archives:
+  - format: tar.gz
+    # this name template makes the OS and Arch compatible with the results of uname.
+    name_template: >-
+      {{ .ProjectName }}_
+      {{- title .Os }}_
+      {{- if eq .Arch "amd64" }}x86_64
+      {{- else if eq .Arch "386" }}i386
+      {{- else }}{{ .Arch }}{{ end }}
+      {{- if .Arm }}v{{ .Arm }}{{ end }}
+    # use zip for windows archives
+    format_overrides:
+    - goos: windows
+      format: zip
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ incpatch .Version }}-next"
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'
+

go.mod

@@ -0,0 +1,20 @@
+module github.com/lehigh-university-libraries/rollout
+
+go 1.22.0
+
+require (
+	github.com/golang-jwt/jwt/v4 v4.5.0
+	github.com/lestrrat-go/jwx v1.2.29
+)
+
+require (
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/lestrrat-go/backoff/v2 v2.0.8 // indirect
+	github.com/lestrrat-go/blackmagic v1.0.2 // indirect
+	github.com/lestrrat-go/httpcc v1.0.1 // indirect
+	github.com/lestrrat-go/iter v1.0.2 // indirect
+	github.com/lestrrat-go/option v1.0.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	golang.org/x/crypto v0.22.0 // indirect
+)

go.sum

@@ -0,0 +1,85 @@
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+github.com/decred/dcrd/crypto/blake256 v1.0.1/go.mod h1:2OfgNZ5wDpcsFmHmCK5gZTPcCXqlm2ArzUIkw9czNJo=
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main.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+
+	"github.com/golang-jwt/jwt/v4"
+	"github.com/lestrrat-go/jwx/jwk"
+)
+
+var (
+	gitLabJwksURL = "https://%s/oauth/discovery/keys"
+)
+
+func init() {
+	domain := os.Getenv("GITLAB_DOMAIN")
+	if domain == "" {
+		log.Fatal("GITLAB_DOMAIN is required. You could use GITLAB_DOMAIN=gitlab.com")
+	}
+
+	gitLabJwksURL = fmt.Sprintf(gitLabJwksURL, domain)
+}
+
+func main() {
+	ctx := context.Background()
+
+	// Fetch the JWKS from GitLab
+	set, err := jwk.Fetch(ctx, gitLabJwksURL)
+	if err != nil {
+		fmt.Printf("Failed to fetch JWKS: %v\n", err)
+		return
+	}
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		tokenString := r.Header.Get("Authorization")[7:] // Assuming "Bearer " prefix
+
+		// Parse and verify the token
+		token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+			if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
+				return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
+			}
+
+			kid, ok := token.Header["kid"].(string)
+			if !ok {
+				return nil, fmt.Errorf("expecting JWT header to have string 'kid'")
+			}
+
+			// Find the appropriate key in JWKS
+			key, ok := set.LookupKeyID(kid)
+			if !ok {
+				return nil, fmt.Errorf("unable to find key '%s'", kid)
+			}
+
+			var pubkey interface{}
+			if err := key.Raw(&pubkey); err != nil {
+				return nil, fmt.Errorf("failed to get raw key: %v", err)
+			}
+
+			return pubkey, nil
+		})
+
+		if err != nil {
+			http.Error(w, "Failed to verify token: "+err.Error(), http.StatusUnauthorized)
+			return
+		}
+
+		if !token.Valid {
+			http.Error(w, "Invalid token", http.StatusUnauthorized)
+			return
+		}
+
+		fmt.Fprintln(w, "Token is valid")
+	})
+
+	fmt.Println("Server is running on http://localhost:8080/")
+	http.ListenAndServe(":8080", nil)
+}