diff --git a/backend/app/controllers/preview_controller.rb b/backend/app/controllers/preview_controller.rb index 38c884d..dd6458e 100644 --- a/backend/app/controllers/preview_controller.rb +++ b/backend/app/controllers/preview_controller.rb @@ -6,7 +6,7 @@ class PreviewController < ApplicationController render json: { title: Preview::ThumbnailFetcher.title(params[:url]) } rescue Preview::UrlSafety::UnsafeUrl => e - render_preview_error(e.message, :unprocessable_entity) + render_bad_request(e.message) rescue Preview::HttpFetcher::FetchTimeout => e render_preview_error(e.message, :gateway_timeout) rescue Preview::HttpFetcher::FetchFailed => e @@ -20,17 +20,18 @@ class PreviewController < ApplicationController image.auto_orient image.resize '180x180>' image.format 'png' + width, height = image.dimensions + raise Preview::ThumbnailFetcher::GenerationFailed, 'サムネール画像の変換に失敗しました．' if width > 180 || height > 180 + send_data image.to_blob, type: 'image/png', disposition: 'inline' rescue Preview::UrlSafety::UnsafeUrl => e - render_preview_error(e.message, :unprocessable_entity) - rescue Preview::Screenshot::Busy => e - render_preview_error(e.message, :too_many_requests) - rescue Preview::Screenshot::TimedOut, Preview::HttpFetcher::FetchTimeout => e + render_bad_request(e.message) + rescue Preview::HttpFetcher::FetchTimeout => e render_preview_error(e.message, :gateway_timeout) rescue Preview::HttpFetcher::FetchFailed => e render_preview_error(e.message, :bad_gateway) - rescue Preview::Screenshot::Unavailable, MiniMagick::Error => e - render_preview_error(e.message, :unprocessable_entity) + rescue Preview::ThumbnailFetcher::GenerationFailed, MiniMagick::Error => e + render_unprocessable_entity(e.message) end private diff --git a/backend/app/services/preview/screenshot.rb b/backend/app/services/preview/screenshot.rb deleted file mode 100644 index 76707c0..0000000 --- a/backend/app/services/preview/screenshot.rb +++ /dev/null @@ -1,64 +0,0 @@ -module Preview - class Screenshot - class Unavailable < StandardError; end - class Busy < Unavailable; end - class TimedOut < Unavailable; end - - LIMIT = ENV.fetch('PREVIEW_SCREENSHOT_CONCURRENCY', 2).to_i.clamp(1, 10) - TIMEOUT = ENV.fetch('PREVIEW_SCREENSHOT_TIMEOUT', 20).to_i.clamp(5, 60) - @mutex = Mutex.new - @active = 0 - - def self.capture(url) - acquire! - tempfile = nil - pid = nil - - begin - tempfile = Tempfile.new(['preview-thumbnail', '.png']) - tempfile.close - status = nil - pid = Process.spawn( - 'node', Rails.root.join('lib/screenshot.js').to_s, - url, tempfile.path, - out: File::NULL, err: File::NULL, pgroup: true) - Timeout.timeout(TIMEOUT) do - _finished_pid, status = Process.wait2(pid) - end - raise Unavailable, 'スクリーンショットを生成できませんでした．' unless status.success? - raise Unavailable, 'スクリーンショットを生成できませんでした．' unless File.size?(tempfile.path) - - File.binread(tempfile.path) - rescue Timeout::Error - terminate(pid) - raise TimedOut, 'スクリーンショット生成が timeout しました．' - ensure - tempfile&.unlink - release! - end - end - - def self.acquire! - @mutex.synchronize do - raise Busy, 'スクリーンショット生成が混雑してゐます．' if @active >= LIMIT - - @active += 1 - end - end - - def self.release! - @mutex.synchronize { @active -= 1 } - end - - def self.terminate(pid) - return unless pid - - Process.kill('TERM', -pid) - Process.wait(pid) - rescue Errno::ESRCH, Errno::ECHILD - nil - end - - private_class_method :acquire!, :release!, :terminate - end -end diff --git a/backend/app/services/preview/thumbnail_fetcher.rb b/backend/app/services/preview/thumbnail_fetcher.rb index 6ee1cc9..ba3f3cd 100644 --- a/backend/app/services/preview/thumbnail_fetcher.rb +++ b/backend/app/services/preview/thumbnail_fetcher.rb @@ -4,18 +4,15 @@ module Preview def self.fetch(raw_url) uri, = UrlSafety.validate(raw_url) - page = nil known_url = KnownSiteExtractor.thumbnail_url(uri) - image = fetch_image(known_url) if known_url + return fetch_image(known_url) if known_url - unless image - page = HttpFetcher.fetch(uri.to_s) - metadata = HtmlMetadataExtractor.extract(page) - image = fetch_image(metadata[:image_url]) if metadata[:image_url] - end + page = HttpFetcher.fetch(uri.to_s) + metadata = HtmlMetadataExtractor.extract(page) + raise GenerationFailed, 'サムネール画像が見つかりませんでした．' if metadata[:image_url].blank? - image || Screenshot.capture(uri.to_s) + fetch_image(metadata[:image_url]) end def self.title(raw_url) @@ -25,11 +22,15 @@ module Preview def self.fetch_image(url) response = HttpFetcher.fetch(url) - return unless response.content_type.downcase.start_with?('image/') + unless response.content_type.downcase.start_with?('image/') + raise GenerationFailed, 'サムネール画像が見つかりませんでした．' + end response.body + rescue HttpFetcher::FetchTimeout + raise rescue HttpFetcher::FetchFailed - nil + raise GenerationFailed, 'サムネール画像を取得できませんでした．' end private_class_method :fetch_image diff --git a/backend/app/services/preview/url_safety.rb b/backend/app/services/preview/url_safety.rb index 2b8c4b9..34e61c2 100644 --- a/backend/app/services/preview/url_safety.rb +++ b/backend/app/services/preview/url_safety.rb @@ -22,7 +22,7 @@ module Preview raise UnsafeUrl, 'http または https の URL を指定してください．' end else - value = "https://#{ value }" + value = "http://#{ value }" end uri = URI.parse(value) diff --git a/backend/lib/package-lock.json b/backend/lib/package-lock.json deleted file mode 100644 index 7cc1538..0000000 --- a/backend/lib/package-lock.json +++ /dev/null @@ -1,1102 +0,0 @@ -{ - "name": "lib", - "version": "1.0.0", - "lockfileVersion": 3, - "requires": true, - "packages": { - "": { - "name": "lib", - "version": "1.0.0", - "license": "ISC", - "dependencies": { - "puppeteer": "^24.10.0" - } - }, - "node_modules/@babel/code-frame": { - "version": "7.27.1", - "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.27.1.tgz", - "integrity": "sha512-cjQ7ZlQ0Mv3b47hABuTevyTuYN4i+loJKGeV9flcCgIK37cCXRh+L1bd3iBHlynerhQ7BhCkn2BPbQUL+rGqFg==", - "license": "MIT", - "dependencies": { - "@babel/helper-validator-identifier": "^7.27.1", - "js-tokens": "^4.0.0", - "picocolors": "^1.1.1" - }, - "engines": { - "node": ">=6.9.0" - } - }, - "node_modules/@babel/helper-validator-identifier": { - 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['127.0.0.0', 8], ['169.254.0.0', 16], ['172.16.0.0', 12], - ['192.0.0.0', 24], ['192.0.2.0', 24], ['192.168.0.0', 16], - ['198.18.0.0', 15], ['198.51.100.0', 24], ['203.0.113.0', 24], - ['224.0.0.0', 4], ['240.0.0.0', 4], ['::', 128], ['::1', 128], - ['fc00::', 7], ['fe80::', 10], ['ff00::', 8], ['2001:db8::', 32], - ['::ffff:0:0', 96]] - -const blockList = new net.BlockList () -forbiddenNetworks.forEach (([address, prefix]) => { - blockList.addSubnet (address, prefix, net.isIPv6 (address) ? 'ipv6' : 'ipv4') -}) - - -const safeUrl = async rawUrl => { - const url = new URL (rawUrl) - if (!['http:', 'https:'].includes (url.protocol) || url.username || url.password) - return false - - const addresses = await dns.lookup (url.hostname, { all: true, verbatim: true }) - return addresses.length > 0 && addresses.every ( - ({ address, family }) => !blockList.check (address, family === 6 ? 'ipv6' : 'ipv4')) -} - -void (async () => { - const url = process.argv[2] - const output = process.argv[3] - if (!(await safeUrl (url))) - throw new Error ('Unsafe page URL') - - const browser = await puppeteer.launch ({ - args: ['--no-sandbox', '--disable-setuid-sandbox'] }) - - try - { - const page = await browser.newPage () - await page.setRequestInterception (true) - page.on ('request', request => { - void safeUrl (request.url ()) - .then (safe => safe ? request.continue () : request.abort ()) - .catch (() => request.abort ()) - }) - await page.setViewport ({ width: 960, height: 960 }) - await page.goto (url, { waitUntil: 'domcontentloaded', timeout: 12000 }) - await new Promise (resolve => setTimeout (resolve, 1000)) - await page.screenshot ({ path: output }) - } - finally - { - await browser.close () - } -}) ().catch (error => { - console.error (error) - process.exitCode = 1 -})