summaryrefslogtreecommitdiff
path: root/app/assets/javascripts/dropzone_input.js
blob: d2778bcdf1cbffe59a92d72d8f214149ad2465b3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
import $ from 'jquery';
import Dropzone from 'dropzone';
import _ from 'underscore';
import './behaviors/preview_markdown';
import csrf from './lib/utils/csrf';
import axios from './lib/utils/axios_utils';

Dropzone.autoDiscover = false;

/**
 * Return the error message string from the given response.
 *
 * @param {String|Object} res
 */
function getErrorMessage(res) {
  if (!res || _.isString(res)) {
    return res;
  }

  return res.message;
}

export default function dropzoneInput(form) {
  const divHover = '<div class="div-dropzone-hover"></div>';
  const iconPaperclip = '<i class="fa fa-paperclip div-dropzone-icon"></i>';
  const $attachButton = form.find('.button-attach-file');
  const $attachingFileMessage = form.find('.attaching-file-message');
  const $cancelButton = form.find('.button-cancel-uploading-files');
  const $retryLink = form.find('.retry-uploading-link');
  const $uploadProgress = form.find('.uploading-progress');
  const $uploadingErrorContainer = form.find('.uploading-error-container');
  const $uploadingErrorMessage = form.find('.uploading-error-message');
  const $uploadingProgressContainer = form.find('.uploading-progress-container');
  const uploadsPath = form.data('uploads-path') || window.uploads_path || null;
  const maxFileSize = gon.max_file_size || 10;
  const formTextarea = form.find('.js-gfm-input');
  let handlePaste;
  let pasteText;
  let addFileToForm;
  let updateAttachingMessage;
  let isImage;
  let getFilename;
  let uploadFile;

  formTextarea.wrap('<div class="div-dropzone"></div>');
  formTextarea.on('paste', event => handlePaste(event));

  // Add dropzone area to the form.
  const $mdArea = formTextarea.closest('.md-area');
  form.setupMarkdownPreview();
  const $formDropzone = form.find('.div-dropzone');
  $formDropzone.parent().addClass('div-dropzone-wrapper');
  $formDropzone.append(divHover);
  $formDropzone.find('.div-dropzone-hover').append(iconPaperclip);

  if (!uploadsPath) {
    $formDropzone.addClass('js-invalid-dropzone');
    return null;
  }

  const dropzone = $formDropzone.dropzone({
    url: uploadsPath,
    dictDefaultMessage: '',
    clickable: true,
    paramName: 'file',
    maxFilesize: maxFileSize,
    uploadMultiple: false,
    headers: csrf.headers,
    previewContainer: false,
    processing: () => $('.div-dropzone-alert').alert('close'),
    dragover: () => {
      $mdArea.addClass('is-dropzone-hover');
      form.find('.div-dropzone-hover').css('opacity', 0.7);
    },
    dragleave: () => {
      $mdArea.removeClass('is-dropzone-hover');
      form.find('.div-dropzone-hover').css('opacity', 0);
    },
    drop: () => {
      $mdArea.removeClass('is-dropzone-hover');
      form.find('.div-dropzone-hover').css('opacity', 0);
      formTextarea.focus();
    },
    success(header, response) {
      const processingFileCount = this.getQueuedFiles().length + this.getUploadingFiles().length;
      const shouldPad = processingFileCount >= 1;

      pasteText(response.link.markdown, shouldPad);
      // Show 'Attach a file' link only when all files have been uploaded.
      if (!processingFileCount) $attachButton.removeClass('hide');
      addFileToForm(response.link.url);
    },
    error: (file, errorMessage = 'Attaching the file failed.', xhr) => {
      // If 'error' event is fired by dropzone, the second parameter is error message.
      // If the 'errorMessage' parameter is empty, the default error message is set.
      // If the 'error' event is fired by backend (xhr) error response, the third parameter is
      // xhr object (xhr.responseText is error message).
      // On error we hide the 'Attach' and 'Cancel' buttons
      // and show an error.
      const message = getErrorMessage(errorMessage || xhr.responseText);

      $uploadingErrorContainer.removeClass('hide');
      $uploadingErrorMessage.html(message);
      $attachButton.addClass('hide');
      $cancelButton.addClass('hide');
    },
    totaluploadprogress(totalUploadProgress) {
      updateAttachingMessage(this.files, $attachingFileMessage);
      $uploadProgress.text(`${Math.round(totalUploadProgress)}%`);
    },
    sending: () => {
      // DOM elements already exist.
      // Instead of dynamically generating them,
      // we just either hide or show them.
      $attachButton.addClass('hide');
      $uploadingErrorContainer.addClass('hide');
      $uploadingProgressContainer.removeClass('hide');
      $cancelButton.removeClass('hide');
    },
    removedfile: () => {
      $attachButton.removeClass('hide');
      $cancelButton.addClass('hide');
      $uploadingProgressContainer.addClass('hide');
      $uploadingErrorContainer.addClass('hide');
    },
    queuecomplete: () => {
      $('.dz-preview').remove();
      $('.markdown-area').trigger('input');

      $uploadingProgressContainer.addClass('hide');
      $cancelButton.addClass('hide');
    },
  });

  const child = $(dropzone[0]).children('textarea');

  // removeAllFiles(true) stops uploading files (if any)
  // and remove them from dropzone files queue.
  $cancelButton.on('click', (e) => {
    e.preventDefault();
    e.stopPropagation();
    Dropzone.forElement($formDropzone.get(0)).removeAllFiles(true);
  });

  // If 'error' event is fired, we store a failed files,
  // clear dropzone files queue, change status of failed files to undefined,
  // and add that files to the dropzone files queue again.
  // addFile() adds file to dropzone files queue and upload it.
  $retryLink.on('click', (e) => {
    const dropzoneInstance = Dropzone.forElement(e.target.closest('.js-main-target-form').querySelector('.div-dropzone'));
    const failedFiles = dropzoneInstance.files;

    e.preventDefault();

    // 'true' parameter of removeAllFiles() cancels
    // uploading of files that are being uploaded at the moment.
    dropzoneInstance.removeAllFiles(true);

    failedFiles.map((failedFile) => {
      const file = failedFile;

      if (file.status === Dropzone.ERROR) {
        file.status = undefined;
        file.accepted = undefined;
      }

      return dropzoneInstance.addFile(file);
    });
  });
  // eslint-disable-next-line consistent-return
  handlePaste = (event) => {
    const pasteEvent = event.originalEvent;
    if (pasteEvent.clipboardData && pasteEvent.clipboardData.items) {
      const image = isImage(pasteEvent);
      if (image) {
        event.preventDefault();
        const filename = getFilename(pasteEvent) || 'image.png';
        const text = `{{${filename}}}`;
        pasteText(text);
        return uploadFile(image.getAsFile(), filename);
      }
    }
  };

  isImage = (data) => {
    let i = 0;
    while (i < data.clipboardData.items.length) {
      const item = data.clipboardData.items[i];
      if (item.type.indexOf('image') !== -1) {
        return item;
      }
      i += 1;
    }
    return false;
  };

  pasteText = (text, shouldPad) => {
    let formattedText = text;
    if (shouldPad) {
      formattedText += '\n\n';
    }
    const textarea = child.get(0);
    const caretStart = textarea.selectionStart;
    const caretEnd = textarea.selectionEnd;
    const textEnd = $(child).val().length;
    const beforeSelection = $(child).val().substring(0, caretStart);
    const afterSelection = $(child).val().substring(caretEnd, textEnd);
    $(child).val(beforeSelection + formattedText + afterSelection);
    textarea.setSelectionRange(caretStart + formattedText.length, caretEnd + formattedText.length);
    textarea.style.height = `${textarea.scrollHeight}px`;
    formTextarea.get(0).dispatchEvent(new Event('input'));
    return formTextarea.trigger('input');
  };

  addFileToForm = (path) => {
    $(form).append(`<input type="hidden" name="files[]" value="${_.escape(path)}">`);
  };

  getFilename = (e) => {
    let value;
    if (window.clipboardData && window.clipboardData.getData) {
      value = window.clipboardData.getData('Text');
    } else if (e.clipboardData && e.clipboardData.getData) {
      value = e.clipboardData.getData('text/plain');
    }
    value = value.split('\r');
    return value[0];
  };

  const showSpinner = () => $uploadingProgressContainer.removeClass('hide');

  const closeSpinner = () => $uploadingProgressContainer.addClass('hide');

  const showError = (message) => {
    $uploadingErrorContainer.removeClass('hide');
    $uploadingErrorMessage.html(message);
  };

  const closeAlertMessage = () => form.find('.div-dropzone-alert').alert('close');

  const insertToTextArea = (filename, url) => {
    const $child = $(child);
    $child.val((index, val) => val.replace(`{{${filename}}}`, url));

    $child.trigger('change');
  };

  uploadFile = (item, filename) => {
    const formData = new FormData();
    formData.append('file', item, filename);

    showSpinner();
    closeAlertMessage();

    axios.post(uploadsPath, formData)
      .then(({ data }) => {
        const md = data.link.markdown;

        insertToTextArea(filename, md);
        closeSpinner();
      })
      .catch((e) => {
        showError(e.response.data.message);
        closeSpinner();
      });
  };

  updateAttachingMessage = (files, messageContainer) => {
    let attachingMessage;
    const filesCount = files.filter(file => file.status === 'uploading' || file.status === 'queued').length;

    // Dinamycally change uploading files text depending on files number in
    // dropzone files queue.
    if (filesCount > 1) {
      attachingMessage = `Attaching ${filesCount} files -`;
    } else {
      attachingMessage = 'Attaching a file -';
    }

    messageContainer.text(attachingMessage);
  };

  form.find('.markdown-selector').click(function onMarkdownClick(e) {
    e.preventDefault();
    $(this).closest('.gfm-form').find('.div-dropzone').click();
    formTextarea.focus();
  });

  return Dropzone.forElement($formDropzone.get(0));
}