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web.go
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web.go
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package main
import (
"bytes"
"encoding/json"
"html/template"
"io"
"io/fs"
"log"
"net/http"
"os"
"strings"
)
// Headers is a map of string to string where the key is the key for the header
// And the value is the value for the header
type Headers map[string]string
// Response is a generic response object for our handlers
type Response struct {
// StatusCode
Status int
// Content Type to writer
ContentType string
// Content to be written to the response writer
Content io.Reader
// Headers to be written to the response writer
Headers Headers
}
// Write writes a response to an http.ResponseWriter
func (response *Response) Write(rw http.ResponseWriter) {
if response != nil {
if response.ContentType != "" {
rw.Header().Set("Content-Type", response.ContentType)
}
for k, v := range response.Headers {
rw.Header().Set(k, v)
}
rw.WriteHeader(response.Status)
_, err := io.Copy(rw, response.Content)
if err != nil {
rw.WriteHeader(http.StatusInternalServerError)
}
} else {
rw.WriteHeader(http.StatusOK)
}
}
// Action represents a simplified http action
// that implements http.Handler
type Action func(r *http.Request) *Response
// Hyperlink represents a hyperlink
type Hyperlink struct {
Rel string `json:"rel"`
Href string `json:"href"`
}
// Action's http.Handler implementation
func (a Action) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
response := a(r)
response.Write(rw)
}
// Error returns an error response
func Error(status int, err error, headers Headers) *Response {
return &Response{
Status: status,
Content: bytes.NewBufferString(err.Error()),
Headers: headers,
}
}
type errorResponse struct {
Error string `json:"error"`
}
// ErrorJSON returns an error in json format
func ErrorJSON(status int, err error, headers Headers) *Response {
errResp := errorResponse{
Error: err.Error(),
}
b, err := json.Marshal(errResp)
if err != nil {
return Error(http.StatusInternalServerError, err, headers)
}
return &Response{
Status: status,
ContentType: "application/json",
Content: bytes.NewBuffer(b),
Headers: headers,
}
}
// Data returns a data response
func Data(status int, content []byte, headers Headers) *Response {
return &Response{
Status: status,
Content: bytes.NewBuffer(content),
Headers: headers,
}
}
// DataJSON returns a data response in json format
func DataJSON(status int, v interface{}, headers Headers) *Response {
b, err := json.MarshalIndent(v, "", " ")
if err != nil {
return ErrorJSON(http.StatusInternalServerError, err, headers)
}
return &Response{
Status: status,
ContentType: "application/json",
Content: bytes.NewBuffer(b),
Headers: headers,
}
}
// Empty returns an empty http response
func Empty(status int) *Response {
return Data(status, []byte(""), nil)
}
// HTML renders an html template to a web response
func HTML(status int, t *template.Template, template string, data interface{}, headers Headers) *Response {
//render template to buffer
var buf bytes.Buffer
if err := t.ExecuteTemplate(&buf, template, data); err != nil {
log.Println(err)
return Empty(http.StatusInternalServerError)
}
return &Response{
Status: status,
ContentType: "text/html",
Content: &buf,
Headers: headers,
}
}
// TemplateParseFSRecursive recursively parses all templates in the FS with the given extension.
// File paths are used as template names to support duplicate file names.
// Use nonRootTemplateNames to exclude root directory from template names
// (e.g. index.html instead of templates/index.html)
func TemplateParseFSRecursive(
templates fs.FS,
ext string,
nonRootTemplateNames bool,
funcMap template.FuncMap) (*template.Template, error) {
root := template.New("")
err := fs.WalkDir(templates, "templates", func(path string, d fs.DirEntry, err error) error {
if !d.IsDir() && strings.HasSuffix(path, ext) {
if err != nil {
return err
}
b, err := fs.ReadFile(templates, path)
if err != nil {
return err
}
name := ""
if nonRootTemplateNames {
//name the template based on the file path (excluding the root)
parts := strings.Split(path, string(os.PathSeparator))
name = strings.Join(parts[1:], string(os.PathSeparator))
}
t := root.New(name).Funcs(funcMap)
_, err = t.Parse(string(b))
if err != nil {
return err
}
}
return nil
})
return root, err
}
// PathLast returns the last segment in the path
// and the number of path segments
func PathLast(r *http.Request) (string, int) {
//remove trailing /
path := r.URL.Path
if path[len(path)-1] == '/' {
path = path[0 : len(path)-1]
}
parts := strings.Split(path, "/")
l := len(parts) - 1
return parts[l], l
}
// package main
//
// import (
// "bytes"
// "html/template"
// "io"
// "io/fs"
// "log"
// "net/http"
// "os"
// "strings"
// )
//
// // Headers is a map of string to string where the key is the key for the header
// // And the value is the value for the header
// type Headers map[string]string
//
// // Response is a generic response object for our handlers
// type Response struct {
// // StatusCode
// Status int
// // Content Type to writer
// ContentType string
// // Content to be written to the response writer
// Content io.Reader
// // Headers to be written to the response writer
// Headers Headers
// }
//
// // Write writes a response to an http.ResponseWriter
// func (response *Response) Write(rw http.ResponseWriter) {
// if response != nil {
// if response.ContentType != "" {
// rw.Header().Set("Content-Type", response.ContentType)
// }
// for k, v := range response.Headers {
// rw.Header().Set(k, v)
// }
// rw.WriteHeader(response.Status)
// _, err := io.Copy(rw, response.Content)
//
// if err != nil {
// rw.WriteHeader(http.StatusInternalServerError)
// }
// } else {
// rw.WriteHeader(http.StatusOK)
// }
// }
//
// // Action represents a simplified http action
// // that implements http.Handler
// type Action func(r *http.Request) *Response
//
// // Action's http.Handler implementation
// func (a Action) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
// response := a(r)
// response.Write(rw)
// }
//
// // HTML renders an html template to a web response
// func HTML(status int, t *template.Template, template string, data interface{}, headers Headers) *Response {
//
// //render template to buffer
// var buf bytes.Buffer
// if err := t.ExecuteTemplate(&buf, template, data); err != nil {
// log.Println(err)
// return Empty(http.StatusInternalServerError)
// }
// return &Response{
// Status: status,
// ContentType: "text/html",
// Content: &buf,
// Headers: headers,
// }
// }
//
// // TemplateParseFSRecursive recursively parses all templates in the FS with the given extension.
// // File paths are used as template names to support duplicate file names.
// // Use nonRootTemplateNames to exclude root directory from template names
// // (e.g. index.html instead of templates/index.html)
// func TemplateParseFSRecursive(
// templates fs.FS,
// ext string,
// nonRootTemplateNames bool,
// funcMap template.FuncMap) (*template.Template, error) {
//
// root := template.New("")
// err := fs.WalkDir(templates, "templates", func(path string, d fs.DirEntry, err error) error {
// if !d.IsDir() && strings.HasSuffix(path, ext) {
// if err != nil {
// return err
// }
// b, err := fs.ReadFile(templates, path)
// if err != nil {
// return err
// }
// name := ""
// if nonRootTemplateNames {
// //name the template based on the file path (excluding the root)
// parts := strings.Split(path, string(os.PathSeparator))
// name = strings.Join(parts[1:], string(os.PathSeparator))
// }
// t := root.New(name).Funcs(funcMap)
// _, err = t.Parse(string(b))
// if err != nil {
// return err
// }
// }
// return nil
// })
// return root, err
// }
//
// // PathLast returns the last segment in the path
// // and the number of path segments
// func PathLast(r *http.Request) (string, int) {
//
// //remove trailing /
// path := r.URL.Path
// if path[len(path)-1] == '/' {
// path = path[0 : len(path)-1]
// }
//
// parts := strings.Split(path, "/")
// l := len(parts) - 1
// return parts[l], l
// }