mirror of https://github.com/grafana/grafana.git
62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
package pluginscdn
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import (
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"fmt"
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"net/url"
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"path"
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"strings"
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)
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// URLConstructor is a struct that can build CDN URLs for plugins on a remote CDN.
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type URLConstructor struct {
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// cdnURLTemplate is absolute base url of the CDN. This string will be formatted
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// according to the rules specified in the Path method.
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cdnURLTemplate string
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// pluginID is the ID of the plugin.
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pluginID string
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// pluginVersion is the version of the plugin.
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pluginVersion string
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}
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// Path returns a new *url.URL that points to an asset file for the CDN, plugin and plugin version
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// specified by the current URLConstructor.
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//
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// c.cdnURLTemplate is used to build the string, the following substitutions are performed in it:
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//
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// - {id} -> plugin id
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//
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// - {version} -> plugin version
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//
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// - {assetPath} -> assetPath
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//
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// The asset Path is sanitized via path.Clean (double slashes are removed, "../" is resolved, etc).
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//
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// The returned URL will be for a file, so it won't have a trailing slash.
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func (c URLConstructor) Path(assetPath string) (*url.URL, error) {
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u, err := url.Parse(
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strings.TrimRight(
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strings.NewReplacer(
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"{id}", c.pluginID,
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"{version}", c.pluginVersion,
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"{assetPath}", strings.Trim(path.Clean("/"+assetPath+"/"), "/"),
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).Replace(c.cdnURLTemplate),
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"/",
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),
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)
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if err != nil {
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return nil, fmt.Errorf("url parse: %w", err)
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}
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return u, nil
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}
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// StringPath is like Path, but it returns the absolute URL as a string rather than *url.URL.
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func (c URLConstructor) StringPath(assetPath string) (string, error) {
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u, err := c.Path(assetPath)
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if err != nil {
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return "", err
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}
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return u.String(), nil
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}
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