RailwayApp Detector (trufflesecurity#3331)

* Added RailwayApp detector

* Updated Keywords

pkg/detectors/railwayapp/railwayapp.go

@@ -0,0 +1,172 @@
+package railwayapp
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+
+	regexp "github.com/wasilibs/go-re2"
+
+	"github.com/trufflesecurity/trufflehog/v3/pkg/common"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/pb/detectorspb"
+)
+
+type Scanner struct {
+	client *http.Client
+}
+
+// graphQLResponse will handle the response from railway API
+type graphQLResponse struct {
+	Data   interface{}   `json:"data"`
+	Errors []interface{} `json:"errors"`
+}
+
+// Ensure the Scanner satisfies the interface at compile time.
+var _ detectors.Detector = (*Scanner)(nil)
+
+var (
+	defaultClient = common.SaneHttpClient()
+
+	apiToken = regexp.MustCompile(detectors.PrefixRegex([]string{"railway"}) +
+		`\b([a-f0-9]{8}(?:-[a-f0-9]{4}){3}-[a-f0-9]{12})\b`)
+)
+
+func (s Scanner) getClient() *http.Client {
+	if s.client != nil {
+		return s.client
+	}
+
+	return defaultClient
+}
+
+// Keywords are used for efficiently pre-filtering chunks.
+// Use identifiers in the secret preferably, or the provider name.
+func (s Scanner) Keywords() []string {
+	return []string{"railway"}
+}
+
+func (s Scanner) Description() string {
+	return "Railway is a deployment platform designed to streamline the software development life-cycle, starting with instant deployments and effortless scale, extending to CI/CD integrations and built-in observability."
+}
+
+// FromData will find and optionally verify SaladCloud API Key secrets in a given set of bytes.
+func (s Scanner) FromData(ctx context.Context, verify bool, data []byte) (results []detectors.Result, err error) {
+	dataStr := string(data)
+
+	// uniqueMatches will hold unique match values and ensure we only process unique matches found in the data string
+	var uniqueMatches = make(map[string]bool)
+
+	for _, match := range apiToken.FindAllStringSubmatch(dataStr, -1) {
+		if len(match) != 2 {
+			continue
+		}
+
+		uniqueMatches[strings.TrimSpace(match[1])] = true
+	}
+
+	for match := range uniqueMatches {
+		s1 := detectors.Result{
+			DetectorType: detectorspb.DetectorType_RailwayApp,
+			Raw:          []byte(match),
+			ExtraData: map[string]string{
+				"rotation_guide": "https://howtorotate.com/docs/tutorials/railwayapp/",
+			},
+		}
+
+		if verify {
+			client := s.getClient()
+			isVerified, verificationErr := verifyRailwayApp(ctx, client, match)
+			s1.Verified = isVerified
+			s1.SetVerificationError(verificationErr)
+		}
+
+		results = append(results, s1)
+	}
+
+	return results, nil
+}
+
+func (s Scanner) Type() detectorspb.DetectorType {
+	return detectorspb.DetectorType_RailwayApp
+}
+
+/*
+verifyRailwayApp verifies if the passed matched api key for railwayapp is active or not.
+docs: https://docs.railway.app/reference/public-api
+*/
+func verifyRailwayApp(ctx context.Context, client *http.Client, match string) (bool, error) {
+	jsonPayload, err := getJSONPayload()
+	if err != nil {
+		return false, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "POST", "https://backboard.railway.app/graphql/v2", bytes.NewBuffer(jsonPayload))
+	if err != nil {
+		return false, err
+	}
+
+	// set the required headers
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer "+match)
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	/*
+		GraphQL queries return response with 200 OK status code even for errors
+		Sources:
+		https://www.apollographql.com/docs/react/data/error-handling/#graphql-errors
+		https://github.com/rmosolgo/graphql-ruby/issues/1130
+		https://inigo.io/blog/graphql_error_handling
+	*/
+	if resp.StatusCode != http.StatusOK {
+		return false, fmt.Errorf("railway app verification failed with status code %d", resp.StatusCode)
+	}
+
+	// if rate limit is reached, return verification as false with no error
+	if resp.Header.Get("x-ratelimit-remaining") == "0" {
+		return false, nil
+	}
+
+	// read the response body
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return false, err
+	}
+
+	// parse the response body into a structured format
+	var graphqlResponse graphQLResponse
+	if err = json.Unmarshal(body, &graphqlResponse); err != nil {
+		return false, err
+	}
+
+	// if any errors exist in response, return verification as false
+	if len(graphqlResponse.Errors) > 0 {
+		return false, nil
+	}
+
+	return true, nil
+}
+
+// getJSONPayload return the graphQL query as a JSON
+func getJSONPayload() ([]byte, error) {
+	payload := map[string]string{
+		"query": `query me {me {email}}`,
+	}
+
+	// convert the payload to JSON
+	jsonPayload, err := json.Marshal(payload)
+	if err != nil {
+		return nil, fmt.Errorf("error marshalling JSON: %w", err)
+	}
+
+	return jsonPayload, nil
+}