Add image uploader to the Edit Blog page
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@ -1,6 +1,6 @@
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{{ define "title" }}Update Blog{{ end }}
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{{ define "content" }}
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<form action="/blog/edit" method="POST">
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<form name="blog-edit" action="/blog/edit" method="POST">
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<input type="hidden" name="_csrf" value="{{ .CSRF }}">
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{{ if .Data.preview }}
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<div class="card mb-5">
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@ -98,9 +98,14 @@
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id="body"
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placeholder="Post body goes here">{{ .Body }}</textarea>
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<button id="ace-toggle-button" type="button" class="mt-2 btn btn-sm btn-secondary">
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<div class="mt-2">
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<button id="ace-toggle-button" type="button" class="btn btn-sm btn-secondary">
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Toggle Rich Code Editor
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</button>
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<span class="ml-2">Attach a file:</span>
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<input type="file" id="attach-file-button" onChange="uploadFile()">
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</div>
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</div>
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<div class="form-group">
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@ -207,6 +212,43 @@ var ACE;
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setSyntax("markdown");
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})();
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function uploadFile() {
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let $input = document.querySelector("#attach-file-button");
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let syntax = document.querySelector("input[name='content-type']:checked").value;
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let file = $input.files[0];
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var data = new FormData();
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data.append("file", file);
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data.append("_csrf", "{{ .CSRF }}");
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fetch("/admin/upload", {
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method: "POST",
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body: data,
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credentials: "same-origin",
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cache: "no-cache"
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}).then(resp => resp.json()).then(resp => {
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if (!resp.success) {
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window.alert(resp.error);
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return;
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}
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let filename = resp.filename;
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let uri = resp.uri;
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let insert = `\n`;
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if (syntax === "html") {
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insert = `<img alt="${filename}" src="${uri}" class="portrait">\n`;
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}
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if (DISABLE_ACE_EDITOR) {
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document.querySelector("#body").value += insert;
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} else {
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ACE.insert(insert);
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}
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$input.value = "";
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});
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}
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function setSyntax(lang) {
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if (typeof(ACE) !== undefined) {
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ACE.getSession().setMode("ace/mode/"+lang);
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@ -15,6 +15,7 @@ func Register(r *mux.Router, authErrorFunc http.HandlerFunc) {
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adminRouter.HandleFunc("/", indexHandler)
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adminRouter.HandleFunc("/settings", settingsHandler)
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adminRouter.HandleFunc("/editor", editorHandler)
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adminRouter.HandleFunc("/upload", uploadHandler)
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r.PathPrefix("/admin").Handler(negroni.New(
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negroni.HandlerFunc(auth.LoginRequired(authErrorFunc)),
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150
src/controllers/admin/upload.go
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150
src/controllers/admin/upload.go
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@ -0,0 +1,150 @@
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package admin
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import (
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"bytes"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"image"
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"io"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"image/gif"
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"image/jpeg"
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"image/png"
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"github.com/edwvee/exiffix"
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"github.com/kirsle/blog/src/log"
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"github.com/kirsle/blog/src/render"
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"github.com/kirsle/blog/src/responses"
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"github.com/nfnt/resize"
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)
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// TODO: configurable max image width.
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var (
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MaxImageWidth = 1280
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JpegQuality = 90
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)
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// processImage manhandles an image's binary data, scaling it down to <= 1280
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// pixels and stripping off any metadata.
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func processImage(input []byte, ext string) ([]byte, error) {
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if ext == ".gif" {
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return input, nil
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}
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reader := bytes.NewReader(input)
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// Decode the image using exiffix, which will auto-rotate jpeg images etc.
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// based on their EXIF values.
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origImage, _, err := exiffix.Decode(reader)
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if err != nil {
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return input, err
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}
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// Read the config to get the image width.
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reader.Seek(0, io.SeekStart)
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config, _, _ := image.DecodeConfig(reader)
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width := config.Width
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// If the width is too great, scale it down.
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if width > MaxImageWidth {
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width = MaxImageWidth
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}
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newImage := resize.Resize(uint(width), 0, origImage, resize.Lanczos3)
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var output bytes.Buffer
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switch ext {
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case ".jpeg":
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fallthrough
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case ".jpg":
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jpeg.Encode(&output, newImage, &jpeg.Options{
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Quality: JpegQuality,
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})
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case ".png":
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png.Encode(&output, newImage)
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case ".gif":
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gif.Encode(&output, newImage, nil)
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}
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return output.Bytes(), nil
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}
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func uploadHandler(w http.ResponseWriter, r *http.Request) {
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var buf bytes.Buffer
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type response struct {
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Success bool `json:"success"`
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Error string `json:"error,omitempty"`
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Filename string `json:"filename,omitempty"`
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URI string `json:"uri,omitempty"`
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Checksum string `json:"checksum,omitempty"`
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}
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// Get the file from the form data.
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file, header, err := r.FormFile("file")
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if err != nil {
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responses.JSON(w, http.StatusBadRequest, response{
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Error: err.Error(),
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})
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return
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}
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defer file.Close()
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// Validate the extension is an image type.
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ext := strings.ToLower(filepath.Ext(header.Filename))
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if ext != ".jpg" && ext != ".jpeg" && ext != ".png" && ext != ".gif" {
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responses.JSON(w, http.StatusBadRequest, response{
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Error: "Invalid file type, only common image types are supported: jpg, png, gif",
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})
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return
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}
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// Read the file.
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io.Copy(&buf, file)
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binary := buf.Bytes()
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// Process and image and resize it down, strip metadata, etc.
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binary, err = processImage(binary, ext)
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if err != nil {
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responses.JSON(w, http.StatusBadRequest, response{
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Error: "Resize error: " + err.Error(),
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})
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}
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// Make a checksum of it.
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sha := sha256.New()
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sha.Write(binary)
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checksum := hex.EncodeToString(sha.Sum(nil))
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log.Info("Uploaded file names: %s Checksum is: %s", header.Filename, checksum)
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// Write to the /static/photos directory of the user root. Ensure the path
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// exists or create it if not.
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outputPath := filepath.Join(*render.UserRoot, "static", "photos")
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if _, err := os.Stat(outputPath); os.IsNotExist(err) {
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os.MkdirAll(outputPath, 0755)
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}
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// Write the output file.
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filename := filepath.Join(outputPath, checksum+ext)
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outfh, err := os.Create(filename)
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if err != nil {
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responses.JSON(w, http.StatusBadRequest, response{
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Error: err.Error(),
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})
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return
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}
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defer outfh.Close()
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outfh.Write(binary)
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responses.JSON(w, http.StatusOK, response{
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Success: true,
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Filename: header.Filename,
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URI: fmt.Sprintf("/static/photos/%s%s", checksum, ext),
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Checksum: checksum,
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})
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}
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@ -1,6 +1,7 @@
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package responses
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import (
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"encoding/json"
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"fmt"
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"net/http"
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@ -39,3 +40,15 @@ func Redirect(w http.ResponseWriter, location string) {
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w.Header().Set("Location", location)
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w.WriteHeader(http.StatusFound)
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}
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// JSON serializes a JSON response to the browser.
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func JSON(w http.ResponseWriter, statusCode int, v interface{}) {
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w.Header().Set("Content-Type", "application/json; encoding=utf-8")
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w.WriteHeader(statusCode)
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serial, err := json.MarshalIndent(v, "", "\t")
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if err != nil {
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serial, _ = json.Marshal(err.Error())
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}
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w.Write(serial)
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}
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