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staticgen.go
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staticgen.go
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package filemanager
import (
"errors"
"io/ioutil"
"log"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/hacdias/varutils"
)
var (
errUnsupportedFileType = errors.New("The type of the provided file isn't supported for this action")
)
// StaticGen is a static website generator.
type StaticGen interface {
SettingsPath() string
Hook(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error)
Preview(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error)
Publish(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error)
}
// Hugo is the Hugo static website generator.
type Hugo struct {
// Website root
Root string `name:"Website Root"`
// Public folder
Public string `name:"Public Directory"`
// Hugo executable path
Exe string `name:"Hugo Executable"`
// Hugo arguments
Args []string `name:"Hugo Arguments"`
// Indicates if we should clean public before a new publish.
CleanPublic bool `name:"Clean Public"`
// previewPath is the temporary path for a preview
previewPath string
}
// SettingsPath retrieves the correct settings path.
func (h Hugo) SettingsPath() string {
var frontmatter string
var err error
if _, err = os.Stat(filepath.Join(h.Root, "config.yaml")); err == nil {
frontmatter = "yaml"
}
if _, err = os.Stat(filepath.Join(h.Root, "config.json")); err == nil {
frontmatter = "json"
}
if _, err = os.Stat(filepath.Join(h.Root, "config.toml")); err == nil {
frontmatter = "toml"
}
if frontmatter == "" {
return "/settings"
}
return "/config." + frontmatter
}
// Hook is the pre-api handler.
func (h Hugo) Hook(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error) {
// If we are not using HTTP Post, we shall return Method Not Allowed
// since we are only working with this method.
if r.Method != http.MethodPost {
return 0, nil
}
if c.Router != "resource" {
return 0, nil
}
// We only care about creating new files from archetypes here. So...
if r.Header.Get("Archetype") == "" {
return 0, nil
}
if !c.User.AllowNew {
return http.StatusForbidden, nil
}
filename := filepath.Join(string(c.User.FileSystem), r.URL.Path)
archetype := r.Header.Get("archetype")
ext := filepath.Ext(filename)
// If the request isn't for a markdown file, we can't
// handle it.
if ext != ".markdown" && ext != ".md" {
return http.StatusBadRequest, errUnsupportedFileType
}
// Tries to create a new file based on this archetype.
args := []string{"new", filename, "--kind", archetype}
if err := runCommand(h.Exe, args, h.Root); err != nil {
return http.StatusInternalServerError, err
}
// Writes the location of the new file to the Header.
w.Header().Set("Location", "/files/content/"+filename)
return http.StatusCreated, nil
}
// Publish publishes a post.
func (h Hugo) Publish(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error) {
filename := filepath.Join(string(c.User.FileSystem), r.URL.Path)
// We only run undraft command if it is a file.
if strings.HasSuffix(filename, ".md") && strings.HasSuffix(filename, ".markdown") {
if err := h.undraft(filename); err != nil {
return http.StatusInternalServerError, err
}
}
// Regenerates the file
h.run(false)
return 0, nil
}
// Preview handles the preview path.
func (h *Hugo) Preview(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error) {
// Get a new temporary path if there is none.
if h.previewPath == "" {
path, err := ioutil.TempDir("", "")
if err != nil {
return http.StatusInternalServerError, err
}
h.previewPath = path
}
// Build the arguments to execute Hugo: change the base URL,
// build the drafts and update the destination.
args := h.Args
args = append(args, "--baseURL", c.RootURL()+"/preview/")
args = append(args, "--buildDrafts")
args = append(args, "--destination", h.previewPath)
// Builds the preview.
if err := runCommand(h.Exe, args, h.Root); err != nil {
return http.StatusInternalServerError, err
}
// Serves the temporary path with the preview.
http.FileServer(http.Dir(h.previewPath)).ServeHTTP(w, r)
return 0, nil
}
func (h Hugo) run(force bool) {
// If the CleanPublic option is enabled, clean it.
if h.CleanPublic {
os.RemoveAll(h.Public)
}
// Prevent running if watching is enabled
if b, pos := varutils.StringInSlice("--watch", h.Args); b && !force {
if len(h.Args) > pos && h.Args[pos+1] != "false" {
return
}
if len(h.Args) == pos+1 {
return
}
}
if err := runCommand(h.Exe, h.Args, h.Root); err != nil {
log.Println(err)
}
}
func (h Hugo) undraft(file string) error {
args := []string{"undraft", file}
if err := runCommand(h.Exe, args, h.Root); err != nil && !strings.Contains(err.Error(), "not a Draft") {
return err
}
return nil
}
func (h *Hugo) find() error {
var err error
if h.Exe, err = exec.LookPath("hugo"); err != nil {
return err
}
return nil
}
// Jekyll is the Jekyll static website generator.
type Jekyll struct {
// Website root
Root string `name:"Website Root"`
// Public folder
Public string `name:"Public Directory"`
// Jekyll executable path
Exe string `name:"Executable"`
// Jekyll arguments
Args []string `name:"Arguments"`
// Indicates if we should clean public before a new publish.
CleanPublic bool `name:"Clean Public"`
// previewPath is the temporary path for a preview
previewPath string
}
// SettingsPath retrieves the correct settings path.
func (j Jekyll) SettingsPath() string {
return "/_config.yml"
}
// Hook is the pre-api handler.
func (j Jekyll) Hook(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error) {
return 0, nil
}
// Publish publishes a post.
func (j Jekyll) Publish(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error) {
filename := filepath.Join(string(c.User.FileSystem), r.URL.Path)
// We only run undraft command if it is a file.
if err := j.undraft(filename); err != nil {
return http.StatusInternalServerError, err
}
// Regenerates the file
j.run()
return 0, nil
}
// Preview handles the preview path.
func (j *Jekyll) Preview(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error) {
// Get a new temporary path if there is none.
if j.previewPath == "" {
path, err := ioutil.TempDir("", "")
if err != nil {
return http.StatusInternalServerError, err
}
j.previewPath = path
}
// Build the arguments to execute Hugo: change the base URL,
// build the drafts and update the destination.
args := j.Args
args = append(args, "--baseurl", c.RootURL()+"/preview/")
args = append(args, "--drafts")
args = append(args, "--destination", j.previewPath)
// Builds the preview.
if err := runCommand(j.Exe, args, j.Root); err != nil {
return http.StatusInternalServerError, err
}
// Serves the temporary path with the preview.
http.FileServer(http.Dir(j.previewPath)).ServeHTTP(w, r)
return 0, nil
}
func (j Jekyll) run() {
// If the CleanPublic option is enabled, clean it.
if j.CleanPublic {
os.RemoveAll(j.Public)
}
if err := runCommand(j.Exe, j.Args, j.Root); err != nil {
log.Println(err)
}
}
func (j Jekyll) undraft(file string) error {
if !strings.Contains(file, "_drafts") {
return nil
}
return os.Rename(file, strings.Replace(file, "_drafts", "_posts", 1))
}
func (j *Jekyll) find() error {
var err error
if j.Exe, err = exec.LookPath("jekyll"); err != nil {
return err
}
return nil
}
// runCommand executes an external command
func runCommand(command string, args []string, path string) error {
cmd := exec.Command(command, args...)
cmd.Dir = path
out, err := cmd.CombinedOutput()
if err != nil {
return errors.New(string(out))
}
return nil
}