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https://github.com/taigrr/wtf
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e0b54d9315
- Simplify Google OAuth client creation - Read OAuth code via text dialog Same approach can be re-used for gspreadsheets
108 lines
2.9 KiB
Go
108 lines
2.9 KiB
Go
package gcal
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import (
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"context"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"github.com/senorprogrammer/wtf/logger"
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"golang.org/x/oauth2"
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"golang.org/x/oauth2/google"
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)
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// OAuthClientConfig describes Google oauth2 client configuration
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type OAuthClientConfig struct {
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SecretFile string
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TokenFile string
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Scope string
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}
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// OAuthUIHandler returns oauth2 authorization code, implements user interaction
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type OAuthUIHandler = func(string, chan string)
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func BuildOAuthClient(config OAuthClientConfig, handler OAuthUIHandler) (*http.Client, error) {
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ctx := context.Background()
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b, err := ioutil.ReadFile(config.SecretFile)
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if err != nil {
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logger.Log(fmt.Sprintf("Invalid secret file provided (%s): %v", config.SecretFile, err))
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return nil, err
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}
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oauthConfig, err := google.ConfigFromJSON(b, config.Scope)
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if err != nil {
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logger.Log(fmt.Sprintf("Secret file is not readable as JSON (%s): %v", config.SecretFile, err))
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return nil, err
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}
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tok, err := tokenFromFile(config.TokenFile)
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if err != nil {
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result := make(chan string)
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go handler(oauthConfig.AuthCodeURL("state-token", oauth2.AccessTypeOffline), result)
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code, ok := <-result
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if !ok {
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// Cancelled
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return nil, err
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}
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tok, err = oauthConfig.Exchange(oauth2.NoContext, code)
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if err != nil {
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logger.Log(fmt.Sprintf("Invalid exchange code provided (%s): %v", code, err))
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return nil, err
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}
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err = saveToken(config.TokenFile, tok)
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if err != nil {
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logger.Log(fmt.Sprintf("Unable to store oauth token (%s): %v", config.TokenFile, err))
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}
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}
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return oauthConfig.Client(ctx, tok), nil
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}
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// CreateCodeInputDialog shows oauth2 code input dialog
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func CreateCodeInputDialog(title string, widget *Widget) OAuthUIHandler {
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return func(url string, result chan string) {
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readInput := func() {
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fmt.Printf("\r\nOAuth authorization [%s]\r\n", title)
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fmt.Printf("Please open the following URL in your browser and paste authorization code below:\r\n")
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fmt.Printf("%s\r\nAuthorization code: ", url)
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var code string
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if _, err := fmt.Scan(&code); err != nil {
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logger.Log(fmt.Sprintf("Unable to read authorization code: %v", err))
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close(result)
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} else {
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result <- code
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}
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}
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widget.app.Suspend(readInput)
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}
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}
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// tokenFromFile retrieves a Token from a given file path.
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// It returns the retrieved Token and any read error encountered.
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func tokenFromFile(file string) (*oauth2.Token, error) {
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f, err := os.Open(file)
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if err != nil {
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return nil, err
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}
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t := &oauth2.Token{}
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err = json.NewDecoder(f).Decode(t)
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defer f.Close()
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return t, err
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}
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// saveToken uses a file path to create a file and store the
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// token in it.
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func saveToken(file string, token *oauth2.Token) error {
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// fmt.Printf("Saving credential file to: %s\n", file)
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f, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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defer f.Close()
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json.NewEncoder(f).Encode(token)
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return nil
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}
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