Make links clickable in text view of emails

web/helpers.go

@@ -5,16 +5,20 @@ import (
 	"github.com/jhillyerd/inbucket/log"
 	"html"
 	"html/template"
+	"regexp"
 	"strings"
 	"time"
 )
 
 var TemplateFuncs = template.FuncMap{
 	"friendlyTime": friendlyTime,
-	"reverse": reverse,
-	"textToHtml": textToHtml,
+	"reverse":      reverse,
+	"textToHtml":   textToHtml,
 }
 
+// From http://daringfireball.net/2010/07/improved_regex_for_matching_urls
+var urlRE = regexp.MustCompile("(?i)\\b((?:[a-z][\\w-]+:(?:/{1,3}|[a-z0-9%])|www\\d{0,3}[.]|[a-z0-9.\\-]+[.][a-z]{2,4}/)(?:[^\\s()<>]+|\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\))+(?:\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\)|[^\\s`!()\\[\\]{};:'\".,<>?«»“”‘’]))")
+
 // Friendly date & time rendering
 func friendlyTime(t time.Time) template.HTML {
 	ty, tm, td := t.Date()
@@ -45,6 +49,13 @@ func reverse(name string, things ...interface{}) string {
 // HTML display
 func textToHtml(text string) template.HTML {
 	text = html.EscapeString(text)
+	text = urlRE.ReplaceAllStringFunc(text, wrapUrl)
 	replacer := strings.NewReplacer("\r\n", "<br/>\n", "\r", "<br/>\n", "\n", "<br/>\n")
 	return template.HTML(replacer.Replace(text))
 }
+
+// wrapUrl wraps a <a href> tag around the provided URL
+func wrapUrl(url string) string {
+	unescaped := strings.Replace(url, "&amp;", "&", -1)
+	return fmt.Sprintf("<a href=\"%s\" target=\"_blank\">%s</a>", unescaped, url)
+}