Created
December 21, 2021 10:55
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package main | |
import ( | |
"bytes" | |
"compress/flate" | |
"encoding/json" | |
"fmt" | |
"io" | |
"net/http" | |
"os" | |
"strconv" | |
"github.com/go-jose/go-jose/v3" | |
) | |
// spec: https://spec.smarthealth.cards/ | |
type ( | |
UnsafePaylaod struct { | |
Issuer string `json:"iss"` | |
} | |
) | |
func run() error { | |
data := "" | |
if _, err := fmt.Scanln(&data); err != nil { | |
return fmt.Errorf("failed to read data: %w", err) | |
} | |
if data[0:5] != "shc:/" { | |
return fmt.Errorf("invalid format") | |
} | |
rawToken := make([]byte, 0, (len(data)-5)/2) | |
for i := 5; i < len(data); i += 2 { | |
v, err := strconv.Atoi(data[i : i+2]) | |
if err != nil { | |
return fmt.Errorf("failed to convert to int: %w", err) | |
} | |
rawToken = append(rawToken, byte(v)+45) | |
} | |
token, err := jose.ParseSigned(string(rawToken)) | |
if err != nil { | |
return fmt.Errorf("failed to parse token: %w", err) | |
} | |
unsafePayloadReader := flate.NewReader(bytes.NewBuffer(token.UnsafePayloadWithoutVerification())) | |
defer unsafePayloadReader.Close() | |
var unsafePayload UnsafePaylaod | |
if err := json.NewDecoder(unsafePayloadReader).Decode(&unsafePayload); err != nil { | |
return fmt.Errorf("failed to decode payload: %w", err) | |
} | |
resp, err := http.Get(unsafePayload.Issuer + "/.well-known/jwks.json") | |
if err != nil { | |
return fmt.Errorf("failed to get jwks: %w", err) | |
} | |
defer resp.Body.Close() | |
var jwks jose.JSONWebKeySet | |
if err := json.NewDecoder(resp.Body).Decode(&jwks); err != nil { | |
return fmt.Errorf("failed to decode jwks: %w", err) | |
} | |
rawPayload, err := token.Verify(jwks) | |
if err != nil { | |
return fmt.Errorf("failed to verify token: %w", err) | |
} | |
payloadReader := flate.NewReader(bytes.NewBuffer(rawPayload)) | |
defer payloadReader.Close() | |
if _, err := io.Copy(os.Stdout, payloadReader); err != nil { | |
return fmt.Errorf("failed to copy payload: %w", err) | |
} | |
return nil | |
} | |
func main() { | |
if err := run(); err != nil { | |
panic(err) | |
} | |
} |
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