108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
package session
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import (
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"fmt"
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"net/http"
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"time"
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"github.com/drone/drone/Godeps/_workspace/src/github.com/dgrijalva/jwt-go"
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"github.com/drone/drone/pkg/settings"
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common "github.com/drone/drone/pkg/types"
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)
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type Session interface {
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GenerateToken(*common.Token) (string, error)
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GetLogin(*http.Request) *common.Token
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}
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type session struct {
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secret []byte
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expire time.Duration
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}
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func New(s *settings.Session) Session {
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secret := []byte(s.Secret)
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expire := time.Hour * 72
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return &session{
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secret: secret,
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expire: expire,
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}
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}
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// GenerateToken generates a JWT token for the user session
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// that can be appended to the #access_token segment to
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// facilitate client-based OAuth2.
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func (s *session) GenerateToken(t *common.Token) (string, error) {
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token := jwt.New(jwt.GetSigningMethod("HS256"))
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token.Claims["user"] = t.Login
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token.Claims["kind"] = t.Kind
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token.Claims["date"] = t.Issued
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token.Claims["label"] = t.Label
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return token.SignedString(s.secret)
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}
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// GetLogin gets the currently authenticated user for the
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// http.Request. The user details will be stored as either
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// a simple API token or JWT bearer token.
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func (s *session) GetLogin(r *http.Request) *common.Token {
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t := getToken(r)
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if len(t) == 0 {
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return nil
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}
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claims := getClaims(t, s.secret)
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if claims == nil || claims["user"] == nil || claims["date"] == nil || claims["label"] == nil || claims["kind"] == nil {
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return nil
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}
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token := &common.Token{
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Kind: claims["kind"].(string),
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Login: claims["user"].(string),
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Label: claims["label"].(string),
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Issued: int64(claims["date"].(float64)),
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}
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if token.Kind != common.TokenSess {
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return token
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}
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if time.Unix(token.Issued, 0).Add(s.expire).Before(time.Now()) {
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return nil
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}
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return token
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}
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// getToken is a helper function that extracts the token
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// from the http.Request.
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func getToken(r *http.Request) string {
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token := getTokenHeader(r)
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if len(token) == 0 {
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token = getTokenParam(r)
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}
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return token
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}
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// getTokenHeader parses the JWT token value from
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// the http Authorization header.
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func getTokenHeader(r *http.Request) string {
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var tokenstr = r.Header.Get("Authorization")
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fmt.Sscanf(tokenstr, "Bearer %s", &tokenstr)
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return tokenstr
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}
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// getTokenParam parses the JWT token value from
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// the http Request's query parameter.
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func getTokenParam(r *http.Request) string {
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return r.FormValue("access_token")
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}
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// getClaims is a helper function that extracts the token
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// claims from the JWT token string.
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func getClaims(token string, secret []byte) map[string]interface{} {
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t, err := jwt.Parse(token, func(t *jwt.Token) (interface{}, error) {
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return secret, nil
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})
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if err != nil || !t.Valid {
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return nil
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}
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return t.Claims
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}
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