add pdf command, show block time in verify command

2025-04-11 13:57:38 +02:00
parent 03f30f1968
commit 7d577f383e
6 changed files with 401 additions and 1 deletions
--- a/cmd/ots/pdf.go
+++ b/cmd/ots/pdf.go
@@ -0,0 +1,374 @@
+package main
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"log/slog"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"git.intruders.space/public/opentimestamps"
+	"git.intruders.space/public/opentimestamps/ots"
+	"git.intruders.space/public/opentimestamps/verifyer"
+	"github.com/jung-kurt/gofpdf"
+	"github.com/spf13/cobra"
+)
+
+var (
+	// PDF command flags
+	pdfOutput         string
+	pdfIncludeContent bool
+	pdfTitle          string
+	pdfComment        string
+	pdfEsploraURL     string
+)
+
+// pdfCmd represents the pdf command
+var pdfCmd = &cobra.Command{
+	Use:   "pdf [flags] <file> <file.ots>",
+	Short: "Generate a PDF certificate for a timestamp",
+	Long: `Generate a PDF certificate that explains how to verify the timestamp.
+The PDF includes all necessary information such as hashes, operations,
+and instructions for manual verification.`,
+	Args: cobra.ExactArgs(2),
+	Run:  runPdfCmd,
+}
+
+func init() {
+	// Local flags for the pdf command
+	pdfCmd.Flags().StringVarP(&pdfOutput, "output", "o", "", "Output PDF filename (default: original filename with .pdf extension)")
+	pdfCmd.Flags().BoolVar(&pdfIncludeContent, "include-content", false, "Include the original file content in the PDF (for text files only)")
+	pdfCmd.Flags().StringVar(&pdfTitle, "title", "OpenTimestamps Certificate", "Title for the PDF document")
+	pdfCmd.Flags().StringVar(&pdfComment, "comment", "", "Additional comment to include in the certificate")
+	pdfCmd.Flags().StringVar(&pdfEsploraURL, "esplora", "https://blockstream.info/api", "URL of Esplora API for fetching block information")
+}
+
+func runPdfCmd(cmd *cobra.Command, args []string) {
+	filePath := args[0]
+	otsPath := args[1]
+
+	// Determine output file path
+	outputPath := pdfOutput
+	if outputPath == "" {
+		outputPath = filePath + ".certificate.pdf"
+	}
+
+	// Read the original file
+	fileData, err := os.ReadFile(filePath)
+	if err != nil {
+		slog.Error("Failed to read file", "file", filePath, "error", err)
+		os.Exit(1)
+	}
+
+	// Compute the file digest
+	fileDigest := sha256.Sum256(fileData)
+	slog.Debug("Computed file digest", "digest", hex.EncodeToString(fileDigest[:]))
+
+	// Read and parse the OTS file
+	otsData, err := os.ReadFile(otsPath)
+	if err != nil {
+		slog.Error("Failed to read OTS file", "file", otsPath, "error", err)
+		os.Exit(1)
+	}
+
+	timestampFile, err := opentimestamps.ReadFromFile(otsData)
+	if err != nil {
+		slog.Error("Failed to parse OTS file", "file", otsPath, "error", err)
+		os.Exit(1)
+	}
+
+	// Check if the digests match
+	if !bytes.Equal(fileDigest[:], timestampFile.Digest) {
+		slog.Warn("Warning: File digest doesn't match timestamp digest",
+			"file_digest", hex.EncodeToString(fileDigest[:]),
+			"timestamp_digest", hex.EncodeToString(timestampFile.Digest))
+	}
+
+	// Extract Bitcoin attestations
+	bitcoinSeqs := timestampFile.GetBitcoinAttestedSequences()
+	if len(bitcoinSeqs) == 0 {
+		slog.Warn("No Bitcoin attestations found in timestamp, certificate will be for pending timestamps")
+	}
+
+	// Create Bitcoin interface for block time lookup
+	bitcoin := verifyer.NewEsploraClient(pdfEsploraURL, 30*time.Second)
+	slog.Info("Using Esplora API for block information", "url", pdfEsploraURL)
+
+	// Generate the PDF
+	err = generateVerificationPDF(
+		outputPath,
+		filePath,
+		fileData,
+		fileDigest[:],
+		timestampFile,
+		bitcoinSeqs,
+		bitcoin,
+	)
+	if err != nil {
+		slog.Error("Failed to generate PDF", "error", err)
+		os.Exit(1)
+	}
+
+	slog.Info("PDF certificate generated successfully", "file", outputPath)
+}
+
+func generateVerificationPDF(outputPath, filePath string, fileData []byte, fileDigest []byte,
+	timestamp *ots.File, bitcoinSeqs []ots.Sequence, bitcoin verifyer.Bitcoin) error {
+
+	// Create a new PDF
+	pdf := gofpdf.New("P", "mm", "A4", "")
+	pdf.SetTitle(pdfTitle, true)
+	pdf.SetAuthor("OpenTimestamps", true)
+	pdf.SetCreator("OpenTimestamps CLI", true)
+
+	// Set margins
+	pdf.SetMargins(25, 25, 25)
+	pdf.SetAutoPageBreak(true, 25)
+
+	// Add first page - Certificate
+	pdf.AddPage()
+
+	// Title
+	pdf.SetFont("Helvetica", "B", 24)
+	pdf.CellFormat(0, 12, pdfTitle, "", 1, "C", false, 0, "")
+	pdf.Ln(10)
+
+	// Timestamp information section
+	pdf.SetFont("Helvetica", "B", 18)
+	pdf.CellFormat(0, 10, "Timestamp Information", "", 1, "L", false, 0, "")
+	pdf.Ln(5)
+
+	pdf.SetFont("Helvetica", "B", 12)
+	pdf.CellFormat(0, 8, "Filename:", "", 1, "L", false, 0, "")
+	pdf.SetFont("Helvetica", "", 12)
+	pdf.CellFormat(0, 8, filepath.Base(filePath), "", 1, "L", false, 0, "")
+	pdf.Ln(2)
+
+	// Timestamp date
+	pdf.SetFont("Helvetica", "B", 12)
+	if len(bitcoinSeqs) > 0 {
+		// Find the earliest Bitcoin attestation
+		var earliestHeight uint64
+		var earliestBlockTime time.Time
+
+		for _, seq := range bitcoinSeqs {
+			att := seq.GetAttestation()
+			if earliestHeight == 0 || att.BitcoinBlockHeight < earliestHeight {
+				earliestHeight = att.BitcoinBlockHeight
+
+				// Fetch the block time from the blockchain
+				blockHash, err := bitcoin.GetBlockHash(int64(att.BitcoinBlockHeight))
+				if err == nil {
+					blockHeader, err := bitcoin.GetBlockHeader(blockHash)
+					if err == nil {
+						earliestBlockTime = time.Unix(int64(blockHeader.Timestamp.Unix()), 0)
+					}
+				}
+			}
+		}
+
+		// Show Bitcoin timestamp
+		pdf.CellFormat(0, 8, "Timestamp Created:", "", 1, "L", false, 0, "")
+		pdf.SetFont("Helvetica", "", 12)
+
+		if !earliestBlockTime.IsZero() {
+			// If we successfully retrieved the block time, display it
+			pdf.CellFormat(0, 8, fmt.Sprintf("Bitcoin Block #%d (%s)",
+				earliestHeight, earliestBlockTime.Format("Jan 02, 2006 15:04:05 UTC")),
+				"", 1, "L", false, 0, "")
+		} else {
+			// Fallback to just showing the block height
+			pdf.CellFormat(0, 8, fmt.Sprintf("Bitcoin Block #%d", earliestHeight), "", 1, "L", false, 0, "")
+		}
+	} else {
+		// Pending attestation
+		pdf.CellFormat(0, 8, "Status:", "", 1, "L", false, 0, "")
+		pdf.SetFont("Helvetica", "", 12)
+		pdf.CellFormat(0, 8, "Pending confirmation in the Bitcoin blockchain", "", 1, "L", false, 0, "")
+	}
+	pdf.Ln(2)
+
+	// File hash
+	pdf.SetFont("Helvetica", "B", 12)
+	pdf.CellFormat(0, 8, "File SHA-256 Digest:", "", 1, "L", false, 0, "")
+	pdf.SetFont("Courier", "", 10)
+	pdf.CellFormat(0, 8, hex.EncodeToString(fileDigest), "", 1, "L", false, 0, "")
+	pdf.Ln(5)
+
+	// Include comment if provided
+	if pdfComment != "" {
+		pdf.SetFont("Helvetica", "B", 12)
+		pdf.CellFormat(0, 8, "Comment:", "", 1, "L", false, 0, "")
+		pdf.SetFont("Helvetica", "", 12)
+		pdf.MultiCell(0, 8, pdfComment, "", "L", false)
+		pdf.Ln(5)
+	}
+
+	// Include file content if requested and looks like text
+	if pdfIncludeContent && isTextFile(fileData) && len(fileData) < 5000 {
+		pdf.SetFont("Helvetica", "B", 12)
+		pdf.CellFormat(0, 8, "File Content:", "", 1, "L", false, 0, "")
+		pdf.SetFont("Courier", "", 10)
+		content := string(fileData)
+		content = strings.ReplaceAll(content, "\r\n", "\n")
+		pdf.MultiCell(0, 5, content, "", "L", false)
+		pdf.Ln(5)
+	}
+
+	// Add Bitcoin transaction information for each attestation
+	if len(bitcoinSeqs) > 0 {
+		pdf.SetFont("Helvetica", "B", 18)
+		pdf.CellFormat(0, 10, "Bitcoin Attestations", "", 1, "L", false, 0, "")
+		pdf.Ln(5)
+
+		for i, seq := range bitcoinSeqs {
+			att := seq.GetAttestation()
+
+			pdf.SetFont("Helvetica", "B", 14)
+			pdf.CellFormat(0, 8, fmt.Sprintf("Attestation #%d", i+1), "", 1, "L", false, 0, "")
+			pdf.Ln(2)
+
+			// Get block details
+			blockHash, err := bitcoin.GetBlockHash(int64(att.BitcoinBlockHeight))
+			blockTime := "Unknown"
+			if err == nil {
+				blockHeader, err := bitcoin.GetBlockHeader(blockHash)
+				if err == nil {
+					blockTime = blockHeader.Timestamp.Format("Jan 02, 2006 15:04:05 UTC")
+				}
+			}
+
+			pdf.SetFont("Helvetica", "B", 12)
+			pdf.CellFormat(0, 8, "Bitcoin Block Height:", "", 1, "L", false, 0, "")
+			pdf.SetFont("Helvetica", "", 12)
+			pdf.CellFormat(0, 8, fmt.Sprintf("%d", att.BitcoinBlockHeight), "", 1, "L", false, 0, "")
+
+			pdf.SetFont("Helvetica", "B", 12)
+			pdf.CellFormat(0, 8, "Block Time:", "", 1, "L", false, 0, "")
+			pdf.SetFont("Helvetica", "", 12)
+			pdf.CellFormat(0, 8, blockTime, "", 1, "L", false, 0, "")
+
+			pdf.SetFont("Helvetica", "B", 12)
+			pdf.CellFormat(0, 8, "Block Hash:", "", 1, "L", false, 0, "")
+			pdf.SetFont("Courier", "", 10)
+			if blockHash != nil {
+				pdf.CellFormat(0, 8, blockHash.String(), "", 1, "L", false, 0, "")
+			} else {
+				pdf.CellFormat(0, 8, "Unable to retrieve", "", 1, "L", false, 0, "")
+			}
+
+			// In a full implementation, we would show the Bitcoin merkle root and transaction ID
+			// This would require additional API calls to get that information
+
+			// Show operations sequence
+			pdf.SetFont("Helvetica", "B", 12)
+			pdf.CellFormat(0, 8, "Verification Operations:", "", 1, "L", false, 0, "")
+			pdf.SetFont("Courier", "", 10)
+
+			// Format the operations
+			var operationsText string
+			merkleRoot, _ := seq.Compute(timestamp.Digest)
+
+			operationsText += fmt.Sprintf("Starting with digest: %s\n", hex.EncodeToString(timestamp.Digest))
+
+			for j, inst := range seq {
+				if inst.Operation != nil {
+					if inst.Operation.Binary {
+						operationsText += fmt.Sprintf("%d. %s %s\n", j+1, inst.Operation.Name, hex.EncodeToString(inst.Argument))
+					} else {
+						operationsText += fmt.Sprintf("%d. %s\n", j+1, inst.Operation.Name)
+					}
+				}
+			}
+
+			operationsText += fmt.Sprintf("\nResulting merkle root: %s\n", hex.EncodeToString(merkleRoot))
+
+			pdf.MultiCell(0, 5, operationsText, "", "L", false)
+			pdf.Ln(5)
+		}
+	}
+
+	// Add second page - Verification Instructions
+	pdf.AddPage()
+	pdf.SetFont("Helvetica", "B", 18)
+	pdf.CellFormat(0, 10, "Verification Instructions", "", 1, "L", false, 0, "")
+	pdf.Ln(5)
+
+	// Instructions
+	addVerificationInstructions(pdf)
+
+	// Save the PDF
+	return pdf.OutputFileAndClose(outputPath)
+}
+
+func addVerificationInstructions(pdf *gofpdf.Fpdf) {
+	pdf.SetFont("Helvetica", "B", 14)
+	pdf.CellFormat(0, 8, "1. Compute the SHA-256 digest of your file", "", 1, "L", false, 0, "")
+	pdf.SetFont("Helvetica", "", 12)
+	pdf.MultiCell(0, 6, `To verify this timestamp, first compute the SHA-256 digest of your original file. You can use various tools for this:
+
+- On Linux/macOS: Use the command "shasum -a 256 filename"
+- On Windows: Use tools like PowerShell's "Get-FileHash" or third-party tools
+- Online: Various websites can calculate file hashes, but only use trusted sources for sensitive files
+
+Verify that the digest matches the one shown in this certificate.`, "", "L", false)
+	pdf.Ln(5)
+
+	pdf.SetFont("Helvetica", "B", 14)
+	pdf.CellFormat(0, 8, "2. Verify the operations sequence", "", 1, "L", false, 0, "")
+	pdf.SetFont("Helvetica", "", 12)
+	pdf.MultiCell(0, 6, `The operations sequence shown in this certificate transforms the file digest into a value that was stored in the Bitcoin blockchain. To verify manually:
+
+- Start with the file's SHA-256 digest
+- Apply each operation in sequence as shown in the certificate
+- For "append" operations, add the shown bytes to the end of the current value
+- For "prepend" operations, add the shown bytes to the beginning of the current value
+- For "sha256" operations, compute the SHA-256 hash of the current value
+- The final result should match the merkle root shown in the certificate`, "", "L", false)
+	pdf.Ln(5)
+
+	pdf.SetFont("Helvetica", "B", 14)
+	pdf.CellFormat(0, 8, "3. Verify the Bitcoin attestation", "", 1, "L", false, 0, "")
+	pdf.SetFont("Helvetica", "", 12)
+	pdf.MultiCell(0, 6, `For full verification, check that the merkle root was recorded in the Bitcoin blockchain:
+
+- Find the Bitcoin block at the height shown in the certificate
+- The block's merkle root or transaction should contain the computed value
+- You can use block explorers like blockstream.info or blockchain.com
+- The timestamp is confirmed when the merkle root appears in the blockchain`, "", "L", false)
+	pdf.Ln(5)
+
+	pdf.SetFont("Helvetica", "B", 14)
+	pdf.CellFormat(0, 8, "4. Use the OpenTimestamps verifier", "", 1, "L", false, 0, "")
+	pdf.SetFont("Helvetica", "", 12)
+	pdf.MultiCell(0, 6, `For easier verification, use the OpenTimestamps verification tools:
+
+- Command line: Use "ots verify <file> <file.ots>"
+- Online: Visit https://opentimestamps.org and upload your file and .ots timestamp
+- The tools will perform all verification steps automatically`, "", "L", false)
+
+	// Add footer with generation time
+	pdf.Ln(10)
+	pdf.SetFont("Helvetica", "I", 10)
+	pdf.CellFormat(0, 6, fmt.Sprintf("Certificate generated at: %s", time.Now().Format(time.RFC3339)), "", 1, "C", false, 0, "")
+	pdf.CellFormat(0, 6, "OpenTimestamps - https://opentimestamps.org", "", 1, "C", false, 0, "")
+}
+
+// isTextFile tries to determine if a file is likely to be text
+func isTextFile(data []byte) bool {
+	// Simple heuristic: if the file doesn't contain too many non-printable characters,
+	// it's probably text
+	nonPrintable := 0
+	for _, b := range data {
+		if (b < 32 || b > 126) && b != 9 && b != 10 && b != 13 {
+			nonPrintable++
+		}
+	}
+
+	// Allow up to 1% non-printable characters
+	return nonPrintable <= len(data)/100
+}
--- a/cmd/ots/root.go
+++ b/cmd/ots/root.go
@@ -33,6 +33,7 @@ func init() {
 	rootCmd.AddCommand(verifyCmd)
 	rootCmd.AddCommand(upgradeCmd)
 	rootCmd.AddCommand(infoCmd)
+	rootCmd.AddCommand(pdfCmd)
 }

 // setupLogging configures the global logger based on the flags
--- a/cmd/ots/verify.go
+++ b/cmd/ots/verify.go
@@ -2,8 +2,10 @@ package main

 import (
 	"crypto/sha256"
+	"fmt"
 	"log/slog"
 	"os"
+	"strings"
 	"time"

 	"git.intruders.space/public/opentimestamps"
@@ -137,8 +139,21 @@ func runVerifyCmd(cmd *cobra.Command, args []string) {
 		}

 		att := seq.GetAttestation()
+
+		// Get the block time
+		blockHash, err := bitcoin.GetBlockHash(int64(att.BitcoinBlockHeight))
+		blockTime := ""
+		if err == nil {
+			blockHeader, err := bitcoin.GetBlockHeader(blockHash)
+			if err == nil {
+				// Format the block time
+				blockTime = fmt.Sprintf(" (%s)", blockHeader.Timestamp.Format(time.RFC3339))
+			}
+		}
+
 		slog.Info("Verification successful",
-			"block_height", att.BitcoinBlockHeight)
+			"block_height", att.BitcoinBlockHeight,
+			"block_time", strings.TrimPrefix(blockTime, " "))

 		if tx != nil {
 			slog.Info("Bitcoin transaction", "txid", tx.TxHash().String())
--- a/fixtures/flatearthers-united.txt.certificate.pdf
+++ b/fixtures/flatearthers-united.txt.certificate.pdf
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.24.2
 require (
 	github.com/btcsuite/btcd v0.24.2
 	github.com/btcsuite/btcd/chaincfg/chainhash v1.1.0
+	github.com/jung-kurt/gofpdf v1.16.2
 	github.com/spf13/cobra v1.9.1
 	github.com/stretchr/testify v1.10.0
 	golang.org/x/crypto v0.36.0
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,5 @@
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
+github.com/boombuler/barcode v1.0.0/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
 github.com/btcsuite/btcd v0.20.1-beta/go.mod h1:wVuoA8VJLEcwgqHBwHmzLRazpKxTv13Px/pDuV7OomQ=
 github.com/btcsuite/btcd v0.22.0-beta.0.20220111032746-97732e52810c/go.mod h1:tjmYdS6MLJ5/s0Fj4DbLgSbDHbEqLJrtnHecBFkdz5M=
 github.com/btcsuite/btcd v0.23.5-0.20231215221805-96c9fd8078fd/go.mod h1:nm3Bko6zh6bWP60UxwoT5LzdGJsQJaPo6HjduXq9p6A=
@@ -63,6 +64,9 @@ github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLf
 github.com/jessevdk/go-flags v0.0.0-20141203071132-1679536dcc89/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jrick/logrotate v1.0.0/go.mod h1:LNinyqDIJnpAur+b8yyulnQw/wDuN1+BYKlTRt3OuAQ=
+github.com/jung-kurt/gofpdf v1.0.0/go.mod h1:7Id9E/uU8ce6rXgefFLlgrJj/GYY22cpxn+r32jIOes=
+github.com/jung-kurt/gofpdf v1.16.2 h1:jgbatWHfRlPYiK85qgevsZTHviWXKwB1TTiKdz5PtRc=
+github.com/jung-kurt/gofpdf v1.16.2/go.mod h1:1hl7y57EsiPAkLbOwzpzqgx1A30nQCk/YmFV8S2vmK0=
 github.com/kkdai/bstream v0.0.0-20161212061736-f391b8402d23/go.mod h1:J+Gs4SYgM6CZQHDETBtE9HaSEkGmuNXF86RwHhHUvq4=
 github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
@@ -73,9 +77,12 @@ github.com/onsi/gomega v1.4.1/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
+github.com/phpdave11/gofpdi v1.0.7/go.mod h1:vBmVV0Do6hSBHC8uKUQ71JGW+ZGQq74llk/7bXwjDoI=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/ruudk/golang-pdf417 v0.0.0-20181029194003-1af4ab5afa58/go.mod h1:6lfFZQK844Gfx8o5WFuvpxWRwnSoipWe/p622j1v06w=
 github.com/spf13/cobra v1.9.1 h1:CXSaggrXdbHK9CF+8ywj8Amf7PBRmPCOJugH954Nnlo=
 github.com/spf13/cobra v1.9.1/go.mod h1:nDyEzZ8ogv936Cinf6g1RU9MRY64Ir93oCnqb9wxYW0=
 github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
@@ -83,6 +90,7 @@ github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
@@ -95,6 +103,7 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.36.0 h1:AnAEvhDddvBdpY+uR+MyHmuZzzNqXSe/GvuDeob5L34=
 golang.org/x/crypto v0.36.0/go.mod h1:Y4J0ReaxCR1IMaabaSMugxJES1EpwhBHhv2bDHklZvc=
+golang.org/x/image v0.0.0-20190910094157-69e4b8554b2a/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/net v0.0.0-20180719180050-a680a1efc54d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=