125 lines
2.7 KiB
Go
125 lines
2.7 KiB
Go
package pages
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import (
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"fmt"
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"io"
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"mime"
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"net/http"
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"strings"
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"time"
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"github.com/patrickmn/go-cache"
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log "github.com/sirupsen/logrus"
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)
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const (
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// The branch name on which files must reside.
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PagesBranch = "pages"
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)
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var (
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pageCache = cache.New(6*time.Hour, 1*time.Hour)
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)
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type PageContentCache struct {
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Content []byte
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mimeType string
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RequestedAt time.Time
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}
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func makePageContentCacheEntry(username, path string) string {
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return username + ":" + path
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}
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func ServeFile(username, reponame, path, giteaUrl string, w http.ResponseWriter) {
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// Provide a default
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if path == "" {
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path = "/index.html"
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}
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// Strip away a starting / as it messes with Gitea
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if path[:1] == "/" {
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path = path[1:]
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}
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key := makePageContentCacheEntry(username, path)
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entry, found := pageCache.Get(key)
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var content []byte
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var mimeType string
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var err error
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if found {
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log.Debugf("Returning %s from cache", path)
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content = entry.(PageContentCache).Content
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mimeType = entry.(PageContentCache).mimeType
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}
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// We have to do the raw request manually because the Gitea SDK does not allow
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// passing the If-Modfied-Since header.
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apiUrl := fmt.Sprintf(
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"%s/api/v1/repos/%s/%s/raw/%s?ref=%s",
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giteaUrl,
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username,
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reponame,
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path,
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PagesBranch,
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)
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client := &http.Client{}
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req, err := http.NewRequest("GET", apiUrl, nil)
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if found {
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since := entry.(PageContentCache).RequestedAt.Format(time.RFC1123)
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log.Debugf("Found %s in cache. Adding '%s' as If-Modified-Since", key, since)
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req.Header.Add("If-Modified-Since", since)
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}
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resp, err := client.Do(req)
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if err != nil {
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if !found {
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log.Errorf("Failed to get file %s/%s/%s (%s)", username, reponame, path, err)
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w.WriteHeader(404)
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} else {
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log.Debugf("Request failed but page %s is cached in memory", path)
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w.WriteHeader(200)
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w.Header().Set("Content-Type", mimeType)
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w.Write(content)
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}
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return
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}
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defer resp.Body.Close()
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log.Debugf("Gitea API request returned %d", resp.StatusCode)
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if found && resp.StatusCode == 302 {
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log.Debugf("Page %s is unchanged and cached in memory", path)
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w.WriteHeader(200)
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w.Header().Set("Content-Type", mimeType)
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w.Write(content)
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return
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}
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content, err = io.ReadAll(resp.Body)
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if err != nil {
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log.Errorf("Failed to get file %s/%s/%s (%s)", username, reponame, path, err)
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w.WriteHeader(404)
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return
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}
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pathParts := strings.Split(path, ".")
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ext := pathParts[len(pathParts)-1]
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mimeType = mime.TypeByExtension("." + ext)
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now := time.Now()
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pageCache.Set(
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key,
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PageContentCache{
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content,
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mimeType,
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now,
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},
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cache.DefaultExpiration,
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)
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log.Debugf("Page %s requested from Gitea and cached in memory at %v", path, now)
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w.WriteHeader(200)
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w.Header().Set("Content-Type", mimeType)
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w.Write(content)
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}
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