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package modules
import (
"net/http"
"strings"
)
// ModuleMiddleware handles Go module requests directly or passes to next handler
func ModuleMiddleware(moduleHandler http.Handler, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if isModuleRequest(r) {
moduleHandler.ServeHTTP(w, r)
return
}
next.ServeHTTP(w, r)
})
}
// isModuleRequest checks if the request is for Go module endpoints
func isModuleRequest(r *http.Request) bool {
// Check for go-import meta tag requests
if r.URL.Query().Get("go-get") == "1" {
return true
}
// Check for Go module proxy endpoints
return isModuleProxyPath(r.URL.Path)
}
// isModuleProxyPath checks if the path matches Go module proxy endpoints
func isModuleProxyPath(path string) bool {
// Module proxy endpoints:
// /{module}/@v/list
// /{module}/@v/{version}.info
// /{module}/@v/{version}.mod
// /{module}/@v/{version}.zip
// /{module}/@latest
// Check for @latest endpoint
if strings.HasSuffix(path, "/@latest") {
return true
}
// Check for @v/ endpoints
if !strings.Contains(path, "/@v/") {
return false
}
// Valid @v/ endpoint suffixes
suffixes := []string{"/list", ".info", ".mod", ".zip"}
for _, suffix := range suffixes {
if strings.HasSuffix(path, suffix) {
return true
}
}
return false
}
// ExtractModulePath extracts the module path from a request URL
func ExtractModulePath(path string) string {
// Remove leading slash
path = strings.TrimPrefix(path, "/")
// For proxy endpoints, extract module path before /@v/ or /@latest
if idx := strings.Index(path, "/@v/"); idx != -1 {
return path[:idx]
}
if strings.HasSuffix(path, "/@latest") {
return strings.TrimSuffix(path, "/@latest")
}
// Remove trailing slash for clean module paths
return strings.TrimSuffix(path, "/")
}
// ExtractVersion extracts the version from a module proxy request
func ExtractVersion(path string) string {
if !strings.Contains(path, "/@v/") {
return ""
}
// Extract version from /@v/{version}.{suffix}
parts := strings.Split(path, "/@v/")
if len(parts) != 2 {
return ""
}
versionPart := parts[1]
// Special case for /list endpoint
if versionPart == "list" {
return ""
}
// Remove suffix (.info, .mod, .zip)
if idx := strings.LastIndex(versionPart, "."); idx != -1 {
return versionPart[:idx]
}
return versionPart
}
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