Refactor each command in its own file

tesseract/genconf/roots.go

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"encoding/pem"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+)
+
+type CTLogRootsResponse struct {
+	Certificates []string `json:"certificates"`
+}
+
+func generateRoots(args []string) {
+	sourceURL := "https://rennet2027h2.log.ct.ipng.ch/"
+	outputFile := "roots.pem"
+
+	// Parse command line arguments
+	for i := 0; i < len(args); i++ {
+		switch args[i] {
+		case "--source":
+			if i+1 >= len(args) {
+				log.Fatal("--source flag requires a URL argument")
+			}
+			sourceURL = args[i+1]
+			i++ // Skip the next argument since we used it
+		case "--output":
+			if i+1 >= len(args) {
+				log.Fatal("--output flag requires a filename argument")
+			}
+			outputFile = args[i+1]
+			i++ // Skip the next argument since we used it
+		default:
+			log.Fatalf("Unknown argument: %s", args[i])
+		}
+	}
+
+	// Ensure source URL ends with /
+	if !strings.HasSuffix(sourceURL, "/") {
+		sourceURL += "/"
+	}
+
+	// Construct the get-roots URL
+	getRootsURL := sourceURL + "ct/v1/get-roots"
+
+	// Fetch roots from CT log
+	fmt.Printf("Fetching roots from: %s\n", getRootsURL)
+	resp, err := http.Get(getRootsURL)
+	if err != nil {
+		log.Fatalf("Failed to fetch roots: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		log.Fatalf("HTTP request failed with status: %d", resp.StatusCode)
+	}
+
+	// Parse JSON response
+	var rootsResp CTLogRootsResponse
+	err = json.NewDecoder(resp.Body).Decode(&rootsResp)
+	if err != nil {
+		log.Fatalf("Failed to parse JSON response: %v", err)
+	}
+
+	// Create output file
+	outFile, err := os.Create(outputFile)
+	if err != nil {
+		log.Fatalf("Failed to create output file %s: %v", outputFile, err)
+	}
+	defer outFile.Close()
+
+	// Write each certificate as PEM
+	for _, certBase64 := range rootsResp.Certificates {
+		// Decode base64 certificate
+		certBytes, err := base64.StdEncoding.DecodeString(certBase64)
+		if err != nil {
+			log.Fatalf("Failed to decode certificate: %v", err)
+		}
+
+		// Create PEM block
+		pemBlock := &pem.Block{
+			Type:  "CERTIFICATE",
+			Bytes: certBytes,
+		}
+
+		// Write PEM to file
+		err = pem.Encode(outFile, pemBlock)
+		if err != nil {
+			log.Fatalf("Failed to write PEM certificate: %v", err)
+		}
+	}
+
+	fmt.Printf("Successfully wrote %d certificates to %s\n", len(rootsResp.Certificates), outputFile)
+}