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- Simplify Google OAuth client creation - Read OAuth code via text dialog Same approach can be re-used for gspreadsheets
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package gcal | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "os" | ||
|
|
||
| "github.com/senorprogrammer/wtf/logger" | ||
| "golang.org/x/oauth2" | ||
| "golang.org/x/oauth2/google" | ||
| ) | ||
|
|
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| // OAuthClientConfig describes Google oauth2 client configuration | ||
| type OAuthClientConfig struct { | ||
| SecretFile string | ||
| TokenFile string | ||
| Scope string | ||
| } | ||
|
|
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| // OAuthUIHandler returns oauth2 authorization code, implements user interaction | ||
| type OAuthUIHandler = func(string, chan string) | ||
|
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| func BuildOAuthClient(config OAuthClientConfig, handler OAuthUIHandler) (*http.Client, error) { | ||
| ctx := context.Background() | ||
|
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| b, err := ioutil.ReadFile(config.SecretFile) | ||
| if err != nil { | ||
| logger.Log(fmt.Sprintf("Invalid secret file provided (%s): %v", config.SecretFile, err)) | ||
| return nil, err | ||
| } | ||
|
|
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| oauthConfig, err := google.ConfigFromJSON(b, config.Scope) | ||
| if err != nil { | ||
| logger.Log(fmt.Sprintf("Secret file is not readable as JSON (%s): %v", config.SecretFile, err)) | ||
| return nil, err | ||
| } | ||
|
|
||
| tok, err := tokenFromFile(config.TokenFile) | ||
| if err != nil { | ||
| result := make(chan string) | ||
| go handler(oauthConfig.AuthCodeURL("state-token", oauth2.AccessTypeOffline), result) | ||
| code, ok := <-result | ||
| if !ok { | ||
| // Cancelled | ||
| return nil, err | ||
| } | ||
| tok, err = oauthConfig.Exchange(oauth2.NoContext, code) | ||
| if err != nil { | ||
| logger.Log(fmt.Sprintf("Invalid exchange code provided (%s): %v", code, err)) | ||
| return nil, err | ||
| } | ||
| err = saveToken(config.TokenFile, tok) | ||
| if err != nil { | ||
| logger.Log(fmt.Sprintf("Unable to store oauth token (%s): %v", config.TokenFile, err)) | ||
| } | ||
|
|
||
| } | ||
| return oauthConfig.Client(ctx, tok), nil | ||
| } | ||
|
|
||
| // CreateCodeInputDialog shows oauth2 code input dialog | ||
| func CreateCodeInputDialog(title string, widget *Widget) OAuthUIHandler { | ||
| return func(url string, result chan string) { | ||
| readInput := func() { | ||
| fmt.Printf("\r\nOAuth authorization [%s]\r\n", title) | ||
| fmt.Printf("Please open the following URL in your browser and paste authorization code below:\r\n") | ||
| fmt.Printf("%s\r\nAuthorization code: ", url) | ||
| var code string | ||
| if _, err := fmt.Scan(&code); err != nil { | ||
| logger.Log(fmt.Sprintf("Unable to read authorization code: %v", err)) | ||
| close(result) | ||
| } else { | ||
| result <- code | ||
| } | ||
| } | ||
| widget.app.Suspend(readInput) | ||
| } | ||
| } | ||
|
|
||
| // tokenFromFile retrieves a Token from a given file path. | ||
| // It returns the retrieved Token and any read error encountered. | ||
| func tokenFromFile(file string) (*oauth2.Token, error) { | ||
| f, err := os.Open(file) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| t := &oauth2.Token{} | ||
| err = json.NewDecoder(f).Decode(t) | ||
| defer f.Close() | ||
| return t, err | ||
| } | ||
|
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| // saveToken uses a file path to create a file and store the | ||
| // token in it. | ||
| func saveToken(file string, token *oauth2.Token) error { | ||
| // fmt.Printf("Saving credential file to: %s\n", file) | ||
| f, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer f.Close() | ||
| json.NewEncoder(f).Encode(token) | ||
| return nil | ||
| } |
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