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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,10 @@ | ||
| const puppeteer = require('puppeteer'); | ||
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| (async () => { | ||
| const browser = await puppeteer.launch(); | ||
| const page = await browser.newPage(); | ||
| await page.goto('https://news.ycombinator.com', { waitUntil: 'networkidle2' }); | ||
| await page.pdf({ path: 'hn.pdf', format: 'A4' }); | ||
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| await browser.close(); | ||
| })(); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,175 @@ | ||
| package chrome | ||
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| import ( | ||
| "archive/zip" | ||
| "bytes" | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "os" | ||
| "path" | ||
| "path/filepath" | ||
| "runtime" | ||
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| "github.com/pkg/errors" | ||
| ) | ||
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| // ChromiumRevision chromium revision | ||
| const ChromiumRevision = "518818" | ||
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| // DownloadHost download host | ||
| const DownloadHost = "https://storage.googleapis.com" | ||
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| var downloadURLs = map[string]string{ | ||
| "linux": "%s/chromium-browser-snapshots/Linux_x64/%s/chrome-linux.zip", | ||
| "mac": "%s/chromium-browser-snapshots/Mac/%s/chrome-mac.zip", | ||
| "win32": "%s/chromium-browser-snapshots/Win/%s/chrome-win32.zip", | ||
| "win64": "%s/chromium-browser-snapshots/Win_x64/%s/chrome-win32.zip", | ||
| } | ||
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| // Find locally or remotely | ||
| func Find(dir string) (string, error) { | ||
| filepath, err := chromiumPath(dir) | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "error getting chromium path") | ||
| } | ||
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| if _, err := os.Stat(filepath); !os.IsNotExist(err) { | ||
| return filepath, nil | ||
| } | ||
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| if err := download(dir); err != nil { | ||
| return "", errors.Wrapf(err, "error downloading") | ||
| } | ||
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| return filepath, nil | ||
| } | ||
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| // Download path | ||
| func download(dir string) error { | ||
| var url, platform string | ||
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| switch runtime.GOOS { | ||
| case "darwin": | ||
| platform = "mac" | ||
| url = fmt.Sprintf(downloadURLs[platform], DownloadHost, ChromiumRevision) | ||
| case "linux": | ||
| platform = "linux" | ||
| url = fmt.Sprintf(downloadURLs[platform], DownloadHost, ChromiumRevision) | ||
| case "windows": | ||
| platform = "windows" | ||
| // TODO: 32 vs 64 | ||
| url = fmt.Sprintf(downloadURLs["win64"], DownloadHost, ChromiumRevision) | ||
| default: | ||
| return errors.New("unsupported operating system") | ||
| } | ||
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| res, err := http.Get(url) | ||
| if err != nil { | ||
| return errors.Wrapf(err, "error getting download") | ||
| } | ||
| defer res.Body.Close() | ||
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| src, err := ioutil.ReadAll(res.Body) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| folderPath := path.Join(dir, platform+"-"+ChromiumRevision) | ||
| if err := os.MkdirAll(folderPath, 0775); err != nil { | ||
| return errors.Wrapf(err, "error making directory") | ||
| } | ||
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| return unzip(src, folderPath) | ||
| } | ||
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| // Path to the executable | ||
| // TODO: test on windows | ||
| func chromiumPath(dir string) (string, error) { | ||
| var platform string | ||
| switch runtime.GOOS { | ||
| case "darwin": | ||
| platform = "mac" | ||
| return path.Join(dir, platform+"-"+ChromiumRevision, "chrome-mac", "Chromium.app", "Contents", "MacOS", "Chromium"), nil | ||
| case "linux": | ||
| platform = "linux" | ||
| return path.Join(dir, platform+"-"+ChromiumRevision, "chrome-linux", "chrome"), nil | ||
| case "windows": | ||
| platform = "windows" | ||
| return path.Join(dir, platform+"-"+ChromiumRevision, "chrome-win32", "chrome.exe"), nil | ||
| default: | ||
| return "", errors.New("unsupported operating system") | ||
| } | ||
| } | ||
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| // Unzip a file to a destination and preserve the symlinks | ||
| // Based on http://stackoverflow.com/a/24792688/842097 with symlink additions | ||
| func unzip(src []byte, dest string) error { | ||
| rdr := bytes.NewReader(src) | ||
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| r, err := zip.NewReader(rdr, rdr.Size()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| os.MkdirAll(dest, 0755) | ||
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| // Closure to address file descriptors issue with all the deferred .Close() methods | ||
| extractAndWriteFile := func(f *zip.File) error { | ||
| rc, err := f.Open() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer func() { | ||
| if err := rc.Close(); err != nil { | ||
| panic(err) | ||
| } | ||
| }() | ||
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| path := filepath.Join(dest, f.Name) | ||
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| if f.FileInfo().IsDir() { | ||
| os.MkdirAll(path, f.Mode()) | ||
| } else if f.FileInfo().Mode()&os.ModeSymlink != 0 { | ||
| buffer := make([]byte, f.FileInfo().Size()) | ||
| size, err := rc.Read(buffer) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| target := string(buffer[:size]) | ||
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| err = os.Symlink(target, path) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } else { | ||
| os.MkdirAll(filepath.Dir(path), f.Mode()) | ||
| f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer func() { | ||
| if err = f.Close(); err != nil { | ||
| panic(err) | ||
| } | ||
| }() | ||
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| _, err = io.Copy(f, rc) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
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| for _, f := range r.File { | ||
| err := extractAndWriteFile(f) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
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| return nil | ||
| } |