package cloudflareglobalapikey

import (
	"context"
	"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{
	detectors.DefaultMultiPartCredentialProvider
}

// Ensure the Scanner satisfies the interface at compile time.
var _ detectors.Detector = (*Scanner)(nil)

var (
	client = common.SaneHttpClient()

	apiKeyPat = regexp.MustCompile(detectors.PrefixRegex([]string{"cloudflare"}) + `\b([A-Za-z0-9_-]{37})\b`)

	// email pattern thanks https://golangcode.com/validate-an-email-address/
	// emailPat = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
	// the emailPat regex will also match emails ending in .co.uk and .engineering

	emailPat = regexp.MustCompile(`\b([A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}(\.[A-Za-z]{2})?)\b`)
)

// 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{"cloudflare"}
}

// FromData will find and optionally verify CloudflareGlobalApiKey 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)

	apiKeyMatches := apiKeyPat.FindAllStringSubmatch(dataStr, -1)
	emailMatches := emailPat.FindAllStringSubmatch(dataStr, -1)

	for _, apiKeyMatch := range apiKeyMatches {
		if len(apiKeyMatch) != 2 {
			continue
		}
		apiKeyRes := strings.TrimSpace(apiKeyMatch[1])

		for _, emailMatch := range emailMatches {
			if len(emailMatch) != 2 {
				continue
			}
			emailRes := strings.TrimSpace(emailMatch[1])

			s1 := detectors.Result{
				DetectorType: detectorspb.DetectorType_CloudflareGlobalApiKey,
				Redacted:     emailRes,
				Raw:          []byte(apiKeyRes),
				RawV2:        []byte(apiKeyRes + emailRes),
			}

			if verify {
				req, err := http.NewRequestWithContext(ctx, "GET", "https://api.cloudflare.com/client/v4/user", nil)
				if err != nil {
					continue
				}
				req.Header.Add("X-Auth-Email", emailRes)
				req.Header.Add("X-Auth-Key", apiKeyRes)
				req.Header.Add("Content-Type", "application/json")

				res, err := client.Do(req)
				if err == nil {
					defer res.Body.Close()
					if res.StatusCode >= 200 && res.StatusCode < 300 {
						s1.Verified = true
					}
				}
			}

			results = append(results, s1)
		}
	}

	return results, nil
}

func (s Scanner) Type() detectorspb.DetectorType {
	return detectorspb.DetectorType_CloudflareGlobalApiKey
}
