55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package httpapp
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import (
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"compress/gzip"
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"io"
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"net/http"
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"strings"
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)
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// compressionMiddleware provides gzip compression for responses
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func (a *App) compressionMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Check if client accepts gzip
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if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
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next.ServeHTTP(w, r)
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return
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}
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// Skip compression for certain content types
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contentType := r.Header.Get("Content-Type")
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if strings.HasPrefix(contentType, "image/") ||
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strings.HasPrefix(contentType, "video/") ||
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strings.HasPrefix(contentType, "application/zip") {
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next.ServeHTTP(w, r)
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return
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}
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// Create gzip writer
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gz := gzip.NewWriter(w)
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defer gz.Close()
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// Set headers
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w.Header().Set("Content-Encoding", "gzip")
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w.Header().Set("Vary", "Accept-Encoding")
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// Wrap response writer
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gzw := &gzipResponseWriter{
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ResponseWriter: w,
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Writer: gz,
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}
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next.ServeHTTP(gzw, r)
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})
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}
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// gzipResponseWriter wraps http.ResponseWriter with gzip compression
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type gzipResponseWriter struct {
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http.ResponseWriter
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Writer io.Writer
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}
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func (gzw *gzipResponseWriter) Write(b []byte) (int, error) {
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return gzw.Writer.Write(b)
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}
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