Initial _redirects implementation

server/upstream/redirects.go

@@ -0,0 +1,52 @@
+package upstream
+
+import (
+	"strconv"
+	"strings"
+	"time"
+
+	"codeberg.org/codeberg/pages/server/cache"
+	"codeberg.org/codeberg/pages/server/gitea"
+	"github.com/rs/zerolog/log"
+)
+
+type Redirect struct {
+	From       string
+	To         string
+	StatusCode int
+}
+
+// redirectsCacheTimeout specifies the timeout for the redirects cache.
+var redirectsCacheTimeout = 10 * time.Minute
+
+const redirectsConfig = "_redirects"
+
+// GetRedirects returns redirects specified in the _redirects file.
+func (o *Options) GetRedirects(giteaClient *gitea.Client, redirectsCache cache.SetGetKey) []Redirect {
+	var redirects []Redirect
+
+	if cachedValue, ok := redirectsCache.Get(o.TargetOwner + "/" + o.TargetRepo + "/" + o.TargetBranch); ok {
+		redirects = cachedValue.([]Redirect)
+	} else {
+		body, err := giteaClient.GiteaRawContent(o.TargetOwner, o.TargetRepo, o.TargetBranch, redirectsConfig)
+		if err == nil {
+			for _, line := range strings.Split(string(body), "\n") {
+				redirectArr := strings.Fields(line)
+				if len(redirectArr) == 3 {
+					statusCode, err := strconv.Atoi(redirectArr[2])
+					if err != nil {
+						log.Info().Err(err).Msgf("could not read %s of %s/%s", redirectsConfig, o.TargetOwner, o.TargetRepo)
+					}
+
+					redirects = append(redirects, Redirect{
+						From:       redirectArr[0],
+						To:         redirectArr[1],
+						StatusCode: statusCode,
+					})
+				}
+			}
+		}
+		_ = redirectsCache.Set(o.TargetOwner+"/"+o.TargetRepo+"/"+o.TargetBranch, redirects, redirectsCacheTimeout)
+	}
+	return redirects
+}