add install function

install pem files directly to an apc ups

pkg/app/pem_to_p15.go

@@ -0,0 +1,50 @@
+package app
+
+import (
+	"apc-p15-tool/pkg/pkcs15"
+	"fmt"
+	"os"
+)
+
+// pemToAPCP15 reads the specified pem files and returns the apc p15 bytes
+func (app *app) pemToAPCP15(keyFileName, certFileName, parentCmdName string) ([]byte, error) {
+	app.logger.Infof("%s: making apc p15 file from pem files", parentCmdName)
+
+	// Read in PEM files
+	keyPem, err := os.ReadFile(keyFileName)
+	if err != nil {
+		return nil, fmt.Errorf("%s: failed to read key file (%w)", parentCmdName, err)
+	}
+
+	certPem, err := os.ReadFile(certFileName)
+	if err != nil {
+		return nil, fmt.Errorf("%s: failed to read cert file (%w)", parentCmdName, err)
+	}
+
+	// make p15 struct
+	p15, err := pkcs15.ParsePEMToPKCS15(keyPem, certPem)
+	if err != nil {
+		return nil, fmt.Errorf("%s: failed to parse pem files (%w)", parentCmdName, err)
+	}
+
+	app.logger.Infof("%s: successfully loaded pem files", parentCmdName)
+
+	// make file bytes
+	p15File, err := p15.ToP15File()
+	if err != nil {
+		return nil, fmt.Errorf("%s: failed to make p15 file (%w)", parentCmdName, err)
+	}
+
+	// make header for file bytes
+	apcHeader, err := makeFileHeader(p15File)
+	if err != nil {
+		return nil, fmt.Errorf("%s: failed to make p15 file header (%w)", parentCmdName, err)
+	}
+
+	// combine header with file
+	apcFile := append(apcHeader, p15File...)
+
+	app.logger.Infof("%s: apc p15 file data succesfully generated", parentCmdName)
+
+	return apcFile, nil
+}