From eb2e4818a2d40880cf7444a17b9023dcc62a1c80 Mon Sep 17 00:00:00 2001
From: Ryan D <git@ryan0x44.com>
Date: Wed, 8 Mar 2023 22:09:49 +1100
Subject: [PATCH] Implemented loading cert from file

---
 .gitignore |  3 +++
 cert.go    | 15 ++++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/.gitignore b/.gitignore
index 5800750..289935b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,6 @@
 # vendor/
 
 dist/
+
+# Other
+*.pem
diff --git a/cert.go b/cert.go
index f6131fb..0f2ccb3 100644
--- a/cert.go
+++ b/cert.go
@@ -5,6 +5,7 @@ import (
 	"io"
 	"net/http"
 	"net/url"
+	"os"
 	"strings"
 )
 
@@ -28,9 +29,17 @@ func CertLoad(location string) ([]byte, error) {
 	return CertLoadFromFile(location)
 }
 
-func CertLoadFromFile(path string) (cert []byte, err error) {
-	// TODO
-	return nil, fmt.Errorf("loading cert from file is not implemented yet")
+func CertLoadFromFile(filename string) (cert []byte, err error) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, fmt.Errorf("cannot open cert file '%s': %s", filename, err)
+	}
+	defer file.Close()
+	cert, err = io.ReadAll(file)
+	if err != nil {
+		return nil, fmt.Errorf("cannot read cert file '%s': %s", filename, err)
+	}
+	return
 }
 
 func CertLoadFromURL(inURL string) (cert []byte, err error) {