56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
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package updater
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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)
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// GenericUpdateInfo holds the information from a latest.json file.
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// This file is expected to be at the root of a generic HTTP update server.
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type GenericUpdateInfo struct {
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Version string `json:"version"` // The version number of the update.
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URL string `json:"url"` // The URL to download the update from.
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}
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// GetLatestUpdateFromURL fetches and parses a latest.json file from a base URL.
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// The server at the baseURL should host a 'latest.json' file that contains
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// the version and download URL for the latest update.
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//
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// Example of latest.json:
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//
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// {
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// "version": "1.2.3",
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// "url": "https://your-server.com/path/to/release-asset"
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// }
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func GetLatestUpdateFromURL(baseURL string) (*GenericUpdateInfo, error) {
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u, err := url.Parse(baseURL)
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if err != nil {
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return nil, fmt.Errorf("invalid base URL: %w", err)
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}
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// Append latest.json to the path
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u.Path += "/latest.json"
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resp, err := http.Get(u.String())
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if err != nil {
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return nil, fmt.Errorf("failed to fetch latest.json: %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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return nil, fmt.Errorf("failed to fetch latest.json: status code %d", resp.StatusCode)
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}
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var info GenericUpdateInfo
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if err := json.NewDecoder(resp.Body).Decode(&info); err != nil {
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return nil, fmt.Errorf("failed to parse latest.json: %w", err)
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}
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if info.Version == "" || info.URL == "" {
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return nil, fmt.Errorf("invalid latest.json content: version or url is missing")
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}
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return &info, nil
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}
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