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jwtshardrouter.go
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jwtshardrouter.go
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package caddyshardrouter
import (
"fmt"
"net/http"
"strings"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"github.com/redis/go-redis/v9"
)
func init() {
caddy.RegisterModule(JWTShardRouter{})
httpcaddyfile.RegisterHandlerDirective("jwt_shard_router", jwtParseCaddyfile)
}
type JWTShardRouter struct {
}
func (JWTShardRouter) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "http.handlers.jwt_shard_router",
New: func() caddy.Module { return new(JWTShardRouter) },
}
}
func (m JWTShardRouter) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
authHeader := r.Header.Get("Authorization")
tokenStr := strings.TrimPrefix(authHeader, "Bearer ")
claims, err := ParseJWT(tokenStr)
if err != nil {
return caddyhttp.Error(http.StatusUnauthorized, err)
}
customer, ok := claims["customer"].(string)
if !ok {
http.Error(w, "failed to parse customer", http.StatusBadRequest)
return next.ServeHTTP(w, r)
}
r.Header.Set("X-Customer", customer)
shard, err := rdb.Get(ctx, customer).Result()
if err == redis.Nil {
http.Error(w, "customer not found", http.StatusNotFound)
return next.ServeHTTP(w, r)
} else if err != nil {
return caddyhttp.Error(http.StatusInternalServerError, fmt.Errorf("failed to query redis"))
}
caddyhttp.SetVar(r.Context(), "shard.upstream", shard)
return next.ServeHTTP(w, r)
}
func jwtParseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
var m JWTShardRouter
return m, nil
}