Load message from file or url

Adds the capability to have the message be a local or remote file. Allows more dynamic messaging that can be generated by a previous step or a centralized message.

Author: donny-dont

plugin.go

@@ -140,7 +140,12 @@ func (p Plugin) Exec() error {
 }
 
 func templateMessage(t string, plugin Plugin) (string, error) {
-	return template.RenderTrim(t, plugin)
+	c, err := contents(t)
+	if err != nil {
+		return "", fmt.Errorf("could not read template: %w", err)
+	}
+
+	return template.RenderTrim(c, plugin)
 }
 
 func message(repo Repo, build Build) string {

util.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+)
+
+func contents(str string) (string, error) {
+	// Check for the empty string
+	if str == "" {
+		return str, nil
+	}
+
+	isFilePath := false
+
+	// See if the string is referencing a URL
+	if u, err := url.Parse(str); err == nil {
+		switch u.Scheme {
+		case "http", "https":
+			res, err := http.Get(str)
+			if err != nil {
+				return "", err
+			}
+
+			defer res.Body.Close()
+			b, err := io.ReadAll(res.Body)
+			if err != nil {
+				return "", fmt.Errorf("could not read response: %w", err)
+			}
+
+			return string(b), nil
+
+		case "file":
+			// Fall through to file loading
+			str = u.Path
+			isFilePath = true
+		}
+	}
+
+	// See if the string is referencing a file
+	_, err := os.Stat(str)
+	if err == nil {
+		b, err := os.ReadFile(str)
+		if err != nil {
+			return "", fmt.Errorf("could not load file %s: %w", str, err)
+		}
+
+		return string(b), nil
+	}
+
+	if isFilePath {
+		return "", fmt.Errorf("could not load file %s: %w", str, err)
+	}
+
+	// Its a regular string
+	return str, nil
+}