108 lines
3.1 KiB
Go
108 lines
3.1 KiB
Go
package upstream
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import (
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"strconv"
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"strings"
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"time"
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"codeberg.org/codeberg/pages/server/cache"
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"codeberg.org/codeberg/pages/server/context"
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"codeberg.org/codeberg/pages/server/gitea"
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"github.com/rs/zerolog/log"
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)
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type Redirect struct {
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From string
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To string
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StatusCode int
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}
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// rewriteURL returns the destination URL and true if r matches reqURL.
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func (r *Redirect) rewriteURL(reqURL string) (dstURL string, ok bool) {
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// check if from url matches request url
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if strings.TrimSuffix(r.From, "/") == strings.TrimSuffix(reqURL, "/") {
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return r.To, true
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}
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// handle wildcard redirects
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if strings.HasSuffix(r.From, "/*") {
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trimmedFromURL := strings.TrimSuffix(r.From, "/*")
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if reqURL == trimmedFromURL || strings.HasPrefix(reqURL, trimmedFromURL+"/") {
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if strings.Contains(r.To, ":splat") {
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matched := strings.TrimPrefix(reqURL, trimmedFromURL)
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matched = strings.TrimPrefix(matched, "/")
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return strings.ReplaceAll(r.To, ":splat", matched), true
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}
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return r.To, true
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}
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}
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return "", false
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}
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// redirectsCacheTimeout specifies the timeout for the redirects cache.
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var redirectsCacheTimeout = 10 * time.Minute
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const redirectsConfig = "_redirects"
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// getRedirects returns redirects specified in the _redirects file.
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func (o *Options) getRedirects(giteaClient *gitea.Client, redirectsCache cache.ICache) []Redirect {
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var redirects []Redirect
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cacheKey := o.TargetOwner + "/" + o.TargetRepo + "/" + o.TargetBranch
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// Check for cached redirects
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if cachedValue, ok := redirectsCache.Get(cacheKey); ok {
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redirects = cachedValue.([]Redirect)
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} else {
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// Get _redirects file and parse
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body, err := giteaClient.GiteaRawContent(o.TargetOwner, o.TargetRepo, o.TargetBranch, redirectsConfig)
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if err == nil {
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for _, line := range strings.Split(string(body), "\n") {
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redirectArr := strings.Fields(line)
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// Ignore comments and invalid lines
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if strings.HasPrefix(line, "#") || len(redirectArr) < 2 {
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continue
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}
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// Get redirect status code
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statusCode := 301
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if len(redirectArr) == 3 {
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statusCode, err = strconv.Atoi(redirectArr[2])
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if err != nil {
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log.Info().Err(err).Msgf("could not read %s of %s/%s", redirectsConfig, o.TargetOwner, o.TargetRepo)
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}
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}
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redirects = append(redirects, Redirect{
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From: redirectArr[0],
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To: redirectArr[1],
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StatusCode: statusCode,
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})
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}
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}
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_ = redirectsCache.Set(cacheKey, redirects, redirectsCacheTimeout)
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}
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return redirects
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}
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func (o *Options) matchRedirects(ctx *context.Context, giteaClient *gitea.Client, redirects []Redirect, redirectsCache cache.ICache) (final bool) {
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reqURL := ctx.Req.RequestURI
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// remove repo and branch from request url
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reqURL = strings.TrimPrefix(reqURL, "/"+o.TargetRepo)
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reqURL = strings.TrimPrefix(reqURL, "/@"+o.TargetBranch)
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for _, redirect := range redirects {
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if dstURL, ok := redirect.rewriteURL(reqURL); ok {
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// do rewrite if status code is 200
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if redirect.StatusCode == 200 {
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o.TargetPath = dstURL
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o.Upstream(ctx, giteaClient, redirectsCache)
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} else {
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ctx.Redirect(dstURL, redirect.StatusCode)
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}
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return true
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}
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}
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return false
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}
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