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mirror of https://github.com/jlelse/GoBlog synced 2024-07-15 12:22:58 +00:00
GoBlog/httpMiddlewares.go

100 lines
2.9 KiB
Go

package main
import (
"net/http"
"net/url"
"slices"
"github.com/tiptophelmet/cspolicy"
"github.com/tiptophelmet/cspolicy/directives"
"github.com/tiptophelmet/cspolicy/directives/constraint"
"github.com/tiptophelmet/cspolicy/src"
)
func noIndexHeader(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-Robots-Tag", "noindex")
next.ServeHTTP(w, r)
})
}
func fixHTTPHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.URL.RawPath = ""
next.ServeHTTP(w, r)
})
}
func headAsGetHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodHead {
// Clone request and change method
newReq := new(http.Request)
*newReq = *r
newReq.Method = http.MethodGet
// Serve new request
next.ServeHTTP(w, newReq)
return
}
next.ServeHTTP(w, r)
})
}
func (a *goBlog) securityHeaders(next http.Handler) http.Handler {
// Build CSP domains list
allowedDomains := []string{}
if mp := a.cfg.Micropub.MediaStorage; mp != nil && mp.MediaURL != "" {
if u, err := url.Parse(mp.MediaURL); err == nil {
allowedDomains = append(allowedDomains, u.Hostname())
}
}
allowedDomains = append(allowedDomains, a.cfg.Server.CSPDomains...)
defaultSrcList := []src.SourceVal{src.Self(), src.Scheme("blob:")}
for _, d := range allowedDomains {
defaultSrcList = append(defaultSrcList, src.Host(d))
}
imgSrcList := []src.SourceVal{src.Self(), src.Scheme("data:")}
for _, d := range allowedDomains {
imgSrcList = append(imgSrcList, src.Host(d))
}
fac := &constraint.FrameAncestorsConstraint{}
fac.Sources(src.None())
csp := cspolicy.Build(
directives.DefaultSrc(defaultSrcList...),
directives.ImgSrc(imgSrcList...),
directives.FrameAncestors(fac),
)
// Return handler
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Strict-Transport-Security", "max-age=31536000;")
w.Header().Set("Referrer-Policy", "no-referrer")
w.Header().Set("X-Content-Type-Options", "nosniff")
w.Header().Set("Content-Security-Policy", csp)
next.ServeHTTP(w, r)
})
}
func (a *goBlog) addOnionLocation(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if a.torAddress != "" {
w.Header().Set("Onion-Location", a.torAddress+r.URL.RequestURI())
}
next.ServeHTTP(w, r)
})
}
func keepSelectedQueryParams(paramsToKeep ...string) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
query := r.URL.Query()
for param := range query {
if !slices.Contains(paramsToKeep, param) {
query.Del(param)
}
}
r.URL.RawQuery = query.Encode()
next.ServeHTTP(w, r)
})
}
}