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annotate libervia/web/pages/_browser/file_uploader.py @ 1532:106945841fbc

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_browser (album): moved code to upload file to a separate `file_uploader` module: this way, uploading logic can be re-used elsewhere.
author Goffi <goffi@goffi.org>
date Thu, 22 Jun 2023 16:36:01 +0200
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1532
106945841fbc _browser (album): moved code to upload file to a separate `file_uploader` module:
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1 import json
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2 from bridge import Bridge
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3 from browser import console as log, window
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4 import dialog
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5 from template import Template
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6 bridge = Bridge()
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7
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8 log.warning = log.warn
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9
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10
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11 class FileUploader:
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12 """Class handling HTTP upload and progress display"""
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13
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14 def __init__(self, files_service, template_file, files_path=None, on_delete_cb=None):
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15 self.files_service = files_service
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16 self.files_path = files_path
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17 self.item_tpl = Template(template_file)
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18 self.on_delete_cb = on_delete_cb
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19 self.uploaded = {}
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20
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21 def on_progress(self, ev, item_elt):
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22 if ev.lengthComputable:
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23 percent = int(ev.loaded/ev.total*100)
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24 self.update_progress(item_elt, percent)
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25
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26 def on_load(self, file_, item_elt):
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27 self.update_progress(item_elt, 100)
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28 item_elt.classList.add("progress_finished")
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29 item_elt.classList.remove("progress_started")
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30 if self.on_delete_cb is not None:
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31 delete_btn = item_elt.select_one('.action_delete')
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32 if delete_btn is not None:
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33 delete_btn.bind("click", self.on_delete_cb)
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34 log.info(f"file {file_.name} uploaded correctly")
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35
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36 def on_error(self, failure, file_, item_elt):
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37 dialog.notification.show(
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38 f"can't upload {file_.name}: {failure}",
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39 level="error"
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40 )
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41
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42 def update_progress(self, item_elt, new_value):
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43 progress_elt = item_elt.select_one("progress")
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44 if progress_elt is not None:
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45 progress_elt.value = new_value
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46 progress_elt.text = f"{new_value}%"
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47
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48 def on_slot_cb(self, file_, upload_slot, item_elt):
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49 put_url, get_url, headers = upload_slot
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50 xhr = window.XMLHttpRequest.new()
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51 xhr.open("PUT", put_url, True)
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52 xhr.upload.bind('progress', lambda ev: self.on_progress(ev, item_elt))
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53 xhr.upload.bind('load', lambda ev: self.on_load(file_, item_elt))
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54 xhr.upload.bind('error', lambda ev: self.on_error(xhr.response, file_, item_elt))
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55 if self.files_path is not None:
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56 xhr.setRequestHeader(
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57 'Xmpp-File-Path',
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58 window.encodeURIComponent(self.files_path)
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59 )
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60 xhr.setRequestHeader('Xmpp-File-No-Http', "true")
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61 xhr.send(file_)
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62
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63 # we update file data with the get URL
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64 file_data = json.loads(item_elt.getAttribute("data-file"))
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65 file_data["url"] = get_url
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66 item_elt.setAttribute("data-file", json.dumps(file_data))
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67
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68 def on_slot_eb(self, file_, failure, item_elt):
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69 dialog.notification.show(
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70 f"Can't get upload slot: {failure['message']}",
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71 level="error"
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72 )
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73 item_elt.remove()
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74
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75 def upload_files(self, files, container_elt):
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76 """Start file upload, and add item_tpl to container_elt"""
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77 log.info(f"uploading {len(files)} files")
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78 for file_ in files:
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79 url = window.URL.createObjectURL(file_)
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80
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81 file_data = {
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82 "name": file_.name,
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83 "mime_type": file_.type,
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84 }
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85 template_file_data = file_data.copy()
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86 # we don't want to open the file on click, it's not yet the
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87 # uploaded URL
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88 template_file_data["url"] = url
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89 # we have no thumb yet, so we use the whole image
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90 # TODO: reduce image for preview
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91 template_file_data["thumb_url"] = url
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92
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93 item_elt = self.item_tpl.get_elt({
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94 "file": template_file_data,
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95 "uploading": True,
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96 })
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97 item_elt.setAttribute("data-file", json.dumps(file_data))
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98 item_elt.classList.add("progress_started")
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99 container_elt <= item_elt
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100
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101 bridge.file_http_upload_get_slot(
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102 file_.name,
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103 file_.size,
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104 file_.type or '',
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105 self.files_service,
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106 callback=lambda upload_slot, file_=file_, item_elt=item_elt:
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107 self.on_slot_cb(file_, upload_slot, item_elt),
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108 errback=lambda failure, file_=file_, item_elt=item_elt:
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109 self.on_slot_eb(file_, failure, item_elt),
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110 )