51 lines
1.8 KiB
Go
51 lines
1.8 KiB
Go
package middleware
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import (
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"crypto/sha256"
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"crypto/subtle"
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"errors"
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"example.com/userService/internal/apierrors"
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"git.yuntuo.hk/k2safe/go-omni/httpx"
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"os"
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"strings"
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)
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// Auth is the fail-closed registry default. Startup replaces it with configured
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// authentication. This example uses an administrator key and an optional read key;
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// production applications can inject JWT/OIDC through the same middleware slot.
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func Auth(next httpx.Handler) httpx.Handler {
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return func(c *httpx.Context) error {
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return apierrors.Unauthenticated()
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}
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}
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func NewAuthFromEnv() (httpx.Middleware, error) {
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token := os.Getenv("USER_SERVICE_API_TOKEN")
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if len(token) < 32 || strings.ContainsAny(token, " \t\r\n") {
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return nil, errors.New("USER_SERVICE_API_TOKEN requires at least 32 bytes without whitespace")
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}
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readToken := os.Getenv("USER_SERVICE_READ_TOKEN")
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if readToken != "" && (len(readToken) < 32 || strings.ContainsAny(readToken, " \t\r\n") || readToken == token) {
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return nil, errors.New("USER_SERVICE_READ_TOKEN must be a distinct token of at least 32 bytes without whitespace")
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}
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expectedRead := sha256.Sum256([]byte(readToken))
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expected := sha256.Sum256([]byte(token))
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return func(next httpx.Handler) httpx.Handler {
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return func(c *httpx.Context) error {
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parts := strings.Fields(c.Header("Authorization"))
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if len(parts) != 2 || !strings.EqualFold(parts[0], "Bearer") {
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return apierrors.Unauthenticated()
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}
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actual := sha256.Sum256([]byte(parts[1]))
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admin := subtle.ConstantTimeCompare(expected[:], actual[:]) == 1
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read := subtle.ConstantTimeCompare(expectedRead[:], actual[:]) == 1 && readToken != ""
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if !admin && !read {
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return apierrors.Unauthenticated()
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}
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if !admin && c.Request().Method != "GET" && c.Request().Method != "HEAD" {
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return apierrors.Forbidden()
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}
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return next(c)
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}
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}, nil
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}
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