62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
package cwhub
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import (
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"fmt"
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"io"
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"net/http"
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)
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// RemoteHubCfg is used to retrieve index and items from the remote hub.
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type RemoteHubCfg struct {
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Branch string
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URLTemplate string
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IndexPath string
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}
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// urlTo builds the URL to download a file from the remote hub.
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func (r *RemoteHubCfg) urlTo(remotePath string) (string, error) {
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if r == nil {
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return "", ErrNilRemoteHub
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}
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// the template must contain two string placeholders
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if fmt.Sprintf(r.URLTemplate, "%s", "%s") != r.URLTemplate {
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return "", fmt.Errorf("invalid URL template '%s'", r.URLTemplate)
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}
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return fmt.Sprintf(r.URLTemplate, r.Branch, remotePath), nil
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}
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// fetchIndex downloads the index from the hub and returns the content.
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func (r *RemoteHubCfg) fetchIndex() ([]byte, error) {
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if r == nil {
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return nil, ErrNilRemoteHub
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}
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url, err := r.urlTo(r.IndexPath)
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if err != nil {
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return nil, fmt.Errorf("failed to build hub index request: %w", err)
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}
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resp, err := hubClient.Get(url)
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if err != nil {
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return nil, fmt.Errorf("failed http request for hub index: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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if resp.StatusCode == http.StatusNotFound {
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return nil, IndexNotFoundError{url, r.Branch}
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}
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return nil, fmt.Errorf("bad http code %d for %s", resp.StatusCode, url)
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}
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("failed to read request answer for hub index: %w", err)
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}
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return body, nil
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}
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