114 lines
2.2 KiB
Go
114 lines
2.2 KiB
Go
package jwt
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import (
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"encoding/base64"
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"encoding/json"
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"errors"
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"net/http"
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"strings"
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)
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var (
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ErrMissingConfig = errors.New("missing configuration")
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ErrMissingSecret = errors.New("please provide a shared secret")
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ErrMissingAuthFunc = errors.New("please provide an auth function")
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ErrMissingClaimsFunc = errors.New("please provide a claims function")
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ErrEncoding = errors.New("error encoding value")
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)
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type Config struct {
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Secret string
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Auth AuthFunc
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Claims ClaimsFunc
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}
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type AuthFunc func(string, string) (bool, error)
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type ClaimsFunc func(id string) (map[string]interface{}, error)
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type JWTMiddleware struct {
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secret string
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auth AuthFunc
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claims ClaimsFunc
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}
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func NewMiddleware(c *Config) (*JWTMiddleware, error) {
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if c == nil {
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return nil, ErrMissingConfig
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}
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if c.Secret == "" {
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return nil, ErrMissingSecret
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}
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if c.Auth == nil {
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return nil, ErrMissingAuthFunc
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}
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if c.Claims == nil {
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return nil, ErrMissingClaimsFunc
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}
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m := &JWTMiddleware{
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secret: c.Secret,
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auth: c.Auth,
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claims: c.Claims,
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}
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return m, nil
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}
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func (m *JWTMiddleware) Secure(h http.Handler) http.Handler {
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// This is just a placeholder for now
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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h.ServeHTTP(w, r)
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})
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}
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func (m *JWTMiddleware) GenerateToken(w http.ResponseWriter, r *http.Request) {
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var b map[string]string
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err := json.NewDecoder(r.Body).Decode(&b)
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if err != nil {
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panic(err)
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}
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result, err := m.auth(b["email"], b["password"])
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if err != nil {
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panic(err)
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}
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if !result {
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panic("deal with this")
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}
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// For now, the header will be static
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header, err := encode(`{"typ":"JWT","alg":"HS256"}`)
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if err != nil {
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panic(err)
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}
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claims, err := m.claims(b["email"])
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if err != nil {
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panic(err)
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}
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claimsJson, err := json.Marshal(claims)
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if err != nil {
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panic(err)
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}
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claimsSet, err := encode(claimsJson)
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if err != nil {
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panic(err)
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}
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response := strings.Join([]string{header, claimsSet}, ".")
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w.Write([]byte(response))
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}
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func encode(s interface{}) (string, error) {
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var r []byte
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switch v := s.(type) {
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case string:
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r = []byte(v)
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case []byte:
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r = v
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default:
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return "", ErrEncoding
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}
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return base64.StdEncoding.EncodeToString(r), nil
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}
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