nirvash/lfo/middleware.go

package lfo

import (
	"context"
	"net/http"
	core "nilfm.cc/git/nirvash/archetype"
	"strings"
)

func WithAdapter(next http.Handler, adapter core.Adapter) http.Handler {
	handlerFunc := func(w http.ResponseWriter, req *http.Request) {
		*req = *req.WithContext(context.WithValue(req.Context(), "adapter", adapter))
		next.ServeHTTP(w, req)
	}

	return http.HandlerFunc(handlerFunc)
}

func WithFileManager(next http.Handler, fileManager core.FileManager) http.Handler {
	handlerFunc := func(w http.ResponseWriter, req *http.Request) {
		*req = *req.WithContext(context.WithValue(req.Context(), "file-manager", fileManager))
		next.ServeHTTP(w, req)
	}

	return http.HandlerFunc(handlerFunc)
}

func EnsurePageData(next http.Handler, adapter core.Adapter) http.Handler {
	handlerFunc := func(w http.ResponseWriter, req *http.Request) {
		pageTitle := req.FormValue("title")
		pageContent := req.FormValue("content")
		newSlug := req.FormValue("slug")

		if pageTitle == "" || pageContent == "" || (adapter.EditableSlugs() && newSlug == "") {
			newUri := "/edit/"
			slug := strings.Join(strings.Split(req.URL.Path, "/")[2:], "/")
			newUri += slug
			newUri += "?no-empty=1"
			req.Method = http.MethodGet
			http.Redirect(w, req, newUri, http.StatusSeeOther)
		} else {
			next.ServeHTTP(w, req)
		}
	}

	return http.HandlerFunc(handlerFunc)
}

func SanitizeFormMap(next http.Handler) http.Handler {
	handlerFunc := func(w http.ResponseWriter, req *http.Request) {
		delete(req.PostForm, "csrfToken")
		next.ServeHTTP(w, req)
	}

	return http.HandlerFunc(handlerFunc)
}

func FormMapToAdapterConfig(next http.Handler, adapter core.Adapter) http.Handler {
	handlerFunc := func(w http.ResponseWriter, req *http.Request) {
		cfg := make(map[core.ConfigOption]string)
		for k, arr := range req.PostForm {
			v := strings.Join(arr, "")
			optNameAndType := strings.Split(k, ":")
			optName := optNameAndType[0]
			optType := optNameAndType[1]
			cfg[core.ConfigOption{
				Name: optName,
				Type: optType,
			}] = v
		}
		*req = *req.WithContext(context.WithValue(req.Context(), "config", cfg))
		next.ServeHTTP(w, req)
	}

	return http.HandlerFunc(handlerFunc)
}

func WithFileData(next http.Handler, fileManager core.FileManager) http.Handler {
	handlerFunc := func(w http.ResponseWriter, req *http.Request) {
		ctx := req.Context()
		fileSlug := ctx.Value("params").(map[string]string)["Slug"]
		fileData := fileManager.GetFileData(fileSlug)
		*req = *req.WithContext(context.WithValue(req.Context(), "file-data", fileData))
		next.ServeHTTP(w, req)
	}

	return http.HandlerFunc(handlerFunc)
}

func PrepareForUpload(next http.Handler) http.Handler {
	handlerFunc := func(w http.ResponseWriter, req *http.Request) {
		req.ParseMultipartForm(250 << 20)
		next.ServeHTTP(w, req)
	}

	return http.HandlerFunc(handlerFunc)
}