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