Add JWT auth

go.mod

@@ -2,4 +2,20 @@ module github.com/lehigh-university-libraries/fabricator
 
 go 1.22.2
 
-require github.com/lehigh-university-libraries/go-islandora v0.0.0-20240709193244-50f8e60d633d
+require (
+	github.com/golang-jwt/jwt/v5 v5.2.1
+	github.com/lehigh-university-libraries/go-islandora v0.0.0-20240709193244-50f8e60d633d
+	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 v0.21.0 // indirect
+)

go.sum

@@ -1,2 +1,86 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/decred/dcrd/crypto/blake256 v1.0.1/go.mod h1:2OfgNZ5wDpcsFmHmCK5gZTPcCXqlm2ArzUIkw9czNJo=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 h1:8UrgZ3GkP4i/CLijOJx79Yu+etlyjdBU4sfcs2WYQMs=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0/go.mod h1:v57UDF4pDQJcEfFUCRop3lJL149eHGSe9Jvczhzjo/0=
+github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
+github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
+github.com/golang-jwt/jwt/v5 v5.2.1 h1:OuVbFODueb089Lh128TAcimifWaLhJwVflnrgM17wHk=
+github.com/golang-jwt/jwt/v5 v5.2.1/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
 github.com/lehigh-university-libraries/go-islandora v0.0.0-20240709193244-50f8e60d633d h1:bryeojGZvWZazzCdVsZB0Pi3LijX/Aq82KgDnjPkt0s=
 github.com/lehigh-university-libraries/go-islandora v0.0.0-20240709193244-50f8e60d633d/go.mod h1:JDCARba/UJW608jcs6XyVuCsfp3LoDVDC++bnGAB47A=
+github.com/lestrrat-go/backoff/v2 v2.0.8 h1:oNb5E5isby2kiro9AgdHLv5N5tint1AnDVVf2E2un5A=
+github.com/lestrrat-go/backoff/v2 v2.0.8/go.mod h1:rHP/q/r9aT27n24JQLa7JhSQZCKBBOiM/uP402WwN8Y=
+github.com/lestrrat-go/blackmagic v1.0.2 h1:Cg2gVSc9h7sz9NOByczrbUvLopQmXrfFx//N+AkAr5k=
+github.com/lestrrat-go/blackmagic v1.0.2/go.mod h1:UrEqBzIR2U6CnzVyUtfM6oZNMt/7O7Vohk2J0OGSAtU=
+github.com/lestrrat-go/httpcc v1.0.1 h1:ydWCStUeJLkpYyjLDHihupbn2tYmZ7m22BGkcvZZrIE=
+github.com/lestrrat-go/httpcc v1.0.1/go.mod h1:qiltp3Mt56+55GPVCbTdM9MlqhvzyuL6W/NMDA8vA5E=
+github.com/lestrrat-go/iter v1.0.2 h1:gMXo1q4c2pHmC3dn8LzRhJfP1ceCbgSiT9lUydIzltI=
+github.com/lestrrat-go/iter v1.0.2/go.mod h1:Momfcq3AnRlRjI5b5O8/G5/BvpzrhoFTZcn06fEOPt4=
+github.com/lestrrat-go/jwx v1.2.29 h1:QT0utmUJ4/12rmsVQrJ3u55bycPkKqGYuGT4tyRhxSQ=
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+github.com/lestrrat-go/option v1.0.1/go.mod h1:5ZHFbivi4xwXxhxY9XHDe2FHo6/Z7WWmtT7T5nBBp3I=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
+golang.org/x/crypto v0.21.0 h1:X31++rzVUdKhX5sWmSOFZxx8UW/ldWx55cbf08iNAMA=
+golang.org/x/crypto v0.21.0/go.mod h1:0BP7YvVV9gBbVKyeTG0Gyn+gZm94bibOW5BjDEYAOMs=
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internal/handlers/check.go

@@ -1,17 +1,78 @@
 package handlers
 
 import (
+	"context"
 	"encoding/json"
+	"fmt"
 	"log/slog"
 	"net/http"
+	"strings"
+
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/lestrrat-go/jwx/jwk"
 )
 
+const googleCertsURL = "https://www.googleapis.com/oauth2/v3/certs"
+
 func CheckMyWork(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {
 		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
 		return
 	}
 
+	authHeader := r.Header.Get("Authorization")
+	if authHeader == "" {
+		slog.Error("Authorization header missing")
+		http.Error(w, "Authorization header missing", http.StatusUnauthorized)
+		return
+	}
+
+	parts := strings.Split(authHeader, " ")
+	if len(parts) != 2 || strings.ToLower(parts[0]) != "bearer" {
+		slog.Error("Token not found")
+		http.Error(w, "Invalid Authorization header format", http.StatusUnauthorized)
+		return
+	}
+
+	tokenString := parts[1]
+	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+		// Validate the alg is what you expect:
+		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("kid not found in token header")
+		}
+
+		ctx := context.Background()
+		jwksSet, err := jwk.Fetch(ctx, googleCertsURL)
+		if err != nil {
+			return nil, fmt.Errorf("unable to fetch JWK set from %s: %v", googleCertsURL, err)
+		}
+		key, ok := jwksSet.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 || !token.Valid {
+		slog.Error("Unable to validate token", "err", err)
+		http.Error(w, "Invalid token", http.StatusUnauthorized)
+		return
+	}
+
+	claims := token.Claims.(jwt.MapClaims)
+	slog.Info("Token is valid", "claims", claims)
+
 	if r.ContentLength == 0 {
 		http.Error(w, "Request body is empty", http.StatusBadRequest)
 		return
@@ -20,7 +81,7 @@ func CheckMyWork(w http.ResponseWriter, r *http.Request) {
 	defer r.Body.Close()
 
 	var csvData [][]string
-	err := json.NewDecoder(r.Body).Decode(&csvData)
+	err = json.NewDecoder(r.Body).Decode(&csvData)
 	if err != nil {
 		http.Error(w, "Error parsing CSV", http.StatusBadRequest)
 		return
@@ -31,12 +92,18 @@ func CheckMyWork(w http.ResponseWriter, r *http.Request) {
 	}
 
 	header := csvData[0]
-
 	for rowIndex, row := range csvData[1:] {
 		item := make(map[string]string, len(header))
+		emptyRow := true
 		for colIndex, cell := range row {
 			column := header[colIndex]
 			item[column] = cell
+			if cell != "" {
+				emptyRow = false
+			}
+		}
+		if emptyRow {
+			continue
 		}
 		slog.Info("Parsed row", "row", rowIndex, "values", item)
 	}