app: restructure and start building p15 output

pkg/app/app.go

@@ -0,0 +1,65 @@
+package app
+
+import (
+	"apc-p15-tool/pkg/pkcs15"
+	"encoding/base64"
+	"os"
+
+	"go.uber.org/zap"
+)
+
+// struct for receivers to use common app pieces
+type app struct {
+	logger *zap.SugaredLogger
+	config *config
+}
+
+// actual application start
+func Start() {
+	// make app w/ initial logger pre-config
+	initLogLevel := "debug"
+	app := &app{
+		logger: makeZapLogger(&initLogLevel),
+	}
+
+	// get config
+	app.getConfig()
+
+	// re-init logger with configured log level
+	app.logger = makeZapLogger(app.config.logLevel)
+
+	// break point for building additional alternate functions
+
+	// function: make p15 from pem files
+
+	// Read in PEM files
+	keyPem, err := os.ReadFile(*app.config.keyPemFilePath)
+	if err != nil {
+		app.logger.Fatalf("failed to read key file (%s)", err)
+		// FATAL
+	}
+
+	certPem, err := os.ReadFile(*app.config.certPemFilePath)
+	if err != nil {
+		app.logger.Fatalf("failed to read cert file (%s)", err)
+		// FATAL
+	}
+
+	p15, err := pkcs15.ParsePEMToPKCS15(keyPem, certPem)
+	if err != nil {
+		app.logger.Fatalf("failed to parse pem files (%s)", err)
+		// FATAL
+	}
+
+	// TEMP TEMP TEMP
+	p15File, err := p15.ToP15File()
+	if err != nil {
+		app.logger.Fatalf("failed to make p15 file (%s)", err)
+		// FATAL
+	}
+
+	// app.logger.Debug(hex.EncodeToString(p15File))
+	app.logger.Debug(base64.RawStdEncoding.EncodeToString(p15File))
+
+	// TEMP TEMP TEMP
+}