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Merge pull request #47 from kayac/feature/provider-authentication-tok…
…en/master Feature/provider authentication token/master
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| package apns | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto" | ||
| "crypto/ecdsa" | ||
| "crypto/rand" | ||
| "crypto/x509" | ||
| "encoding/asn1" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "encoding/pem" | ||
| "io" | ||
| "math/big" | ||
| "time" | ||
| ) | ||
|
|
||
| // https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/CommunicatingwithAPNs.html#//apple_ref/doc/uid/TP40008194-CH11-SW1 | ||
|
|
||
| const jwtDefaultGrowSize = 256 | ||
|
|
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| type jwtHeader struct { | ||
| Alg string `json:"alg"` | ||
| Kid string `json:"kid"` | ||
| } | ||
|
|
||
| type jwtClaim struct { | ||
| Iss string `json:"iss"` | ||
| Iat int64 `json:"iat"` | ||
| } | ||
|
|
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| type ecdsaSignature struct { | ||
| R, S *big.Int | ||
| } | ||
|
|
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| func CreateJWT(key []byte, kid string, teamID string, now time.Time) (string, error) { | ||
| var b bytes.Buffer | ||
| b.Grow(jwtDefaultGrowSize) | ||
|
|
||
| header := jwtHeader{ | ||
| Alg: "ES256", | ||
| Kid: kid, | ||
| } | ||
| headerJSON, err := json.Marshal(&header) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| if err := writeAsBase64(&b, headerJSON); err != nil { | ||
| return "", err | ||
| } | ||
| b.WriteByte(byte('.')) | ||
|
|
||
| claim := jwtClaim{ | ||
| Iss: teamID, | ||
| Iat: now.Unix(), | ||
| } | ||
| claimJSON, err := json.Marshal(&claim) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| if err := writeAsBase64(&b, claimJSON); err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| sig, err := createSignature(b.Bytes(), key) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| b.WriteByte(byte('.')) | ||
|
|
||
| if err := writeAsBase64(&b, sig); err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| return b.String(), nil | ||
| } | ||
|
|
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| func writeAsBase64(w io.Writer, byt []byte) error { | ||
| enc := base64.NewEncoder(base64.RawURLEncoding, w) | ||
| defer enc.Close() | ||
|
|
||
| if _, err := enc.Write(byt); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func createSignature(payload []byte, key []byte) ([]byte, error) { | ||
| h := crypto.SHA256.New() | ||
| if _, err := h.Write(payload); err != nil { | ||
| return nil, err | ||
| } | ||
| msg := h.Sum(nil) | ||
|
|
||
| block, _ := pem.Decode(key) | ||
| p8key, err := x509.ParsePKCS8PrivateKey(block.Bytes) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| r, s, err := ecdsa.Sign(rand.Reader, p8key.(*ecdsa.PrivateKey), msg) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| sig, err := asn1.Marshal(ecdsaSignature{r, s}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return sig, nil | ||
| } |
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