mirror of
https://github.com/neilotoole/sq.git
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111 lines
2.5 KiB
Go
111 lines
2.5 KiB
Go
// Package fetcher provides a mechanism for fetching files
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// from URLs.
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package fetcher
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import (
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"context"
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"crypto/tls"
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"io"
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"net/http"
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"net/url"
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"time"
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"golang.org/x/net/context/ctxhttp"
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"github.com/neilotoole/sq/libsq/core/errz"
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"github.com/neilotoole/sq/libsq/core/stringz"
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)
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// Config parameterizes Fetcher behavior.
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type Config struct {
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// Timeout is the request timeout.
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Timeout time.Duration
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// Skip verification of insecure transports.
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InsecureSkipVerify bool
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}
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// Fetcher can fetch files from URLs. If field Config is nil,
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// defaults are used. At this time, only HTTP/HTTPS is supported,
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// but it's possible other schemes (such as FTP) will be
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// supported in future.
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type Fetcher struct {
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Config *Config
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}
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// Fetch writes the body of the document at fileURL to w.
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func (f *Fetcher) Fetch(ctx context.Context, fileURL string, w io.Writer) error {
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return fetchHTTP(ctx, f.Config, fileURL, w)
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}
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func httpClient(cfg *Config) *http.Client {
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client := *http.DefaultClient
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var tr *http.Transport
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if client.Transport == nil {
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tr = (http.DefaultTransport.(*http.Transport)).Clone()
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} else {
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tr = (client.Transport.(*http.Transport)).Clone()
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}
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if tr.TLSClientConfig == nil {
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tr.TLSClientConfig = &tls.Config{MinVersion: tls.VersionTLS12}
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} else {
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tr.TLSClientConfig = tr.TLSClientConfig.Clone()
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}
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if cfg != nil {
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tr.TLSClientConfig.InsecureSkipVerify = cfg.InsecureSkipVerify
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client.Timeout = cfg.Timeout
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}
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client.Transport = tr
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return &client
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}
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func fetchHTTP(ctx context.Context, cfg *Config, fileURL string, w io.Writer) error {
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c := httpClient(cfg)
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, fileURL, nil)
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if err != nil {
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return err
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}
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resp, err := ctxhttp.Do(ctx, c, req)
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if err != nil {
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return err
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}
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if resp.StatusCode != http.StatusOK {
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_ = resp.Body.Close()
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return errz.Errorf("http: returned non-200 status code (%s) from: %s", resp.Status, fileURL)
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}
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_, err = io.Copy(w, resp.Body)
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if err != nil {
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_ = resp.Body.Close()
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return errz.Wrapf(err, "http: failed to read body from: %s", fileURL)
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}
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return errz.Err(resp.Body.Close())
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}
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// Schemes is the set of supported schemes.
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func (f *Fetcher) Schemes() []string {
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return []string{"http", "https"}
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}
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// Supported returns true if loc is a supported URL.
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func (f *Fetcher) Supported(loc string) bool {
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u, err := url.ParseRequestURI(loc)
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if err != nil {
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return false
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}
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if stringz.InSlice(f.Schemes(), u.Scheme) {
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return true
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}
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return false
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}
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