Class: ShrinkUploadedImage

Inherits:
Object
  • Object
show all
Defined in:
lib/shrink_uploaded_image.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(upload:, path:, max_pixels:, verbose: false, interactive: false) ⇒ ShrinkUploadedImage

Returns a new instance of ShrinkUploadedImage.



6
7
8
9
10
11
12
# File 'lib/shrink_uploaded_image.rb', line 6

def initialize(upload:, path:, max_pixels:, verbose: false, interactive: false)
  @upload = upload
  @path = path
  @max_pixels = max_pixels
  @verbose = verbose
  @interactive = interactive
end

Instance Attribute Details

#pathObject (readonly)

Returns the value of attribute path.



4
5
6
# File 'lib/shrink_uploaded_image.rb', line 4

def path
  @path
end

#uploadObject (readonly)

Returns the value of attribute upload.



4
5
6
# File 'lib/shrink_uploaded_image.rb', line 4

def upload
  @upload
end

Instance Method Details

#performObject



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
# File 'lib/shrink_uploaded_image.rb', line 14

def perform
  # Neither #dup or #clone provide a complete copy
  original_upload = Upload.find_by(id: upload.id)
  unless original_upload
    log "Upload is missing"
    return false
  end

  posts =
    Post
      .unscoped
      .joins(:upload_references)
      .where(upload_references: { upload_id: original_upload.id })
      .uniq
      .sort_by(&:created_at)

  if posts.empty?
    log "Upload not used in any posts"
    return false
  end

  OptimizedImage.downsize(path, path, "#{@max_pixels}@", filename: upload.original_filename)
  sha1 = Upload.generate_digest(path)

  if sha1 == upload.sha1
    log "No sha1 change"
    return false
  end

  w, h = FastImage.size(path, timeout: 15, raise_on_failure: true)

  if !w || !h
    log "Invalid image dimensions after resizing"
    return false
  end

  ww, hh = ImageSizer.resize(w, h)

  # A different upload record that matches the sha1 of the downsized image
  existing_upload = Upload.find_by(sha1: sha1)
  @upload = existing_upload if existing_upload

  upload.attributes = {
    sha1: sha1,
    width: w,
    height: h,
    thumbnail_width: ww,
    thumbnail_height: hh,
    filesize: File.size(path),
  }

  if upload.filesize >= upload.filesize_was
    log "No filesize reduction"
    return false
  end

  unless existing_upload
    url = Discourse.store.store_upload(File.new(path), upload)

    unless url
      log "Couldn't store the upload"
      return false
    end

    upload.url = url
  end

  log "base62: #{original_upload.base62_sha1} -> #{Upload.base62_sha1(sha1)}"
  log "sha: #{original_upload.sha1} -> #{sha1}"
  log "(an existing upload)" if existing_upload

  success = true

  posts.each do |post|
    transform_post(post, original_upload, upload)

    if post.raw_changed?
      log "Updating post"
    elsif post.post_hotlinked_media.exists?(upload_id: original_upload.id)
      log "A hotlinked, unreferenced image"
    elsif post.raw.include?(upload.short_url)
      log "Already processed"
    elsif post.trashed?
      log "A deleted post"
    elsif !post.topic || post.topic.trashed?
      log "A deleted topic"
    elsif post.cooked.include?(original_upload.sha1)
      if post.raw.include?("#{Discourse.base_url.sub(%r{\Ahttps?://}i, "")}/t/")
        log "Updating a topic onebox"
      else
        log "Updating an external onebox"
      end
    else
      log "Could not find the upload URL"
      success = false
    end

    log "#{Discourse.base_url}/p/#{post.id}"
  end

  unless success
    if @interactive
      print "Press any key to continue with the upload"
      STDIN.beep
      STDIN.getch
      puts " k"
    else
      if !existing_upload && !Upload.where(url: upload.url).exists?
        # We're bailing, so clean up the just uploaded file
        Discourse.store.remove_upload(upload)
      end

      log "⏩ Skipping"
      return false
    end
  end

  unless upload.save
    if !existing_upload && !Upload.where(url: upload.url).exists?
      # We're bailing, so clean up the just uploaded file
      Discourse.store.remove_upload(upload)
    end

    log "⏩ Skipping an invalid upload"
    return false
  end

  if existing_upload
    begin
      UploadReference
        .where(target_type: "Post")
        .where(upload_id: original_upload.id)
        .update_all(upload_id: upload.id)
    rescue ActiveRecord::RecordNotUnique, PG::UniqueViolation
    end
  else
    upload.optimized_images.each(&:destroy!)
  end

  posts.each do |post|
    DistributedMutex.synchronize("process_post_#{post.id}") do
      current_post = Post.unscoped.find(post.id)

      # If the post became outdated, reapply changes
      if current_post.updated_at != post.updated_at
        transform_post(current_post, original_upload, upload)
        post = current_post
      end

      post.update_columns(raw: post.raw, updated_at: Time.zone.now) if post.raw_changed?

      if existing_upload
        post
          .post_hotlinked_media
          .where(upload_id: original_upload.id)
          .update_all(upload_id: upload.id)
      end

      post.rebake!
    end
  end

  if existing_upload
    original_upload.reload.destroy!
  else
    Discourse.store.remove_upload(original_upload)
  end

  true
end