122 lines
2.9 KiB
Go
122 lines
2.9 KiB
Go
package responses
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import (
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"errors"
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"fmt"
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"html/template"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"strings"
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"git.kirsle.net/apps/gophertype/pkg/bundled"
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)
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// GetTemplate returns the template file's data, wherever it is.
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// Checks the embedded bindata, then the user root on disk, then error.
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// If it can be found, returns the contents or error.
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func GetFile(path string) ([]byte, error) {
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// Check bindata.
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if b, err := bundled.Asset(path); err == nil {
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return b, nil
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}
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// Check the filesystem. TODO
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if b, err := ioutil.ReadFile("./pvt-www/" + path); err == nil {
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return b, nil
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} else {
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return []byte{}, err
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}
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}
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// GetFileExists checks if the file exists but doesn't return its data.
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func GetFileExists(path string) bool {
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// Check bindata.
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if _, err := bundled.AssetInfo(path); err == nil {
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return true
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}
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// Check the filesystem. TODO
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if _, err := os.Stat(path); err == nil {
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return true
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}
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return false
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}
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/*
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ResolveFile searches for the existence of a file from a fuzzy URL path.
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`path` is a request path like "/about"
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This function would return e.g. "about.gohtml" as being a file path that is
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sure to return data in GetFile().
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Path finding rules follow expected behavior from dominant web servers:
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- If the exact path is found, return it immediately.
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- Try assuming a ".gohtml" or ".md" file extension for the path.
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- Try checking if the path is a directory with an "index.gohtml" inside it, etc.
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*/
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func ResolveFile(path string) (string, error) {
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// Ensure the path doesn't begin with a slash.
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path = strings.TrimLeft(path, "/")
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// Try the exact path.
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if GetFileExists(path) {
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return path, nil
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}
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// Try fuzzy file matches.
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var tries = []string{
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path + ".gohtml",
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path + ".md",
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path + "/index.gohtml",
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path + "/index.html",
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}
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for _, try := range tries {
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path = strings.TrimLeft(try, "/")
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if GetFileExists(path) {
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return path, nil
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}
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}
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return "", errors.New("not found")
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}
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// RenderTemplate renders a Go HTML template.
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// The io.Writer can be an http.ResponseWriter.
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func RenderTemplate(w http.ResponseWriter, tmpl string, vars interface{}) error {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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// Look for the built-in template.
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if b, err := GetFile(tmpl); err == nil {
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t, err := template.New(tmpl).Parse(string(b))
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if err != nil {
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return fmt.Errorf("bundled template '%s': %s", tmpl, err)
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}
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// We found the template. Can we find the layout html?
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if layout, err := GetFile(".layout.gohtml"); err == nil {
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_, err := t.New("layout").Parse(string(layout))
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if err != nil {
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fmt.Errorf("RenderTemplate(.layout.gohtml): %s", err)
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}
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} else {
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log.Printf("RenderTemplate: .layout.gohtml not found to wrap %s", tmpl)
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}
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fmt.Printf("Render Templ: %s", tmpl)
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if err := t.ExecuteTemplate(w, "layout", vars); err != nil {
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log.Printf("RenderTemplate(%s): %s", tmpl, err)
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}
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log.Println("Done")
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return nil
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} else {
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Panic(w, http.StatusInternalServerError, err.Error())
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}
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return nil
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}
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